CN114604173B - Detection system, T-BOX and vehicle - Google Patents

Abstract

The application provides a detection system, a T-BOX and a vehicle, and relates to the technical field of detection circuits, wherein the detection circuit is used for collecting first current transmitted between an audio positive differential output end and collecting second current transmitted between a negative electrode port and an audio negative differential output end; the detection circuit is also used for providing first information to the processor according to the first current and the second current, and the first information is used for determining whether the loudspeaker circuit has a first fault or not by the processor. Because the direct current signal and the alternating current signal output by the audio positive and negative differential output end of the audio power amplifier do not interfere with current collection, the detection system can realize fault detection on the loudspeaker when the audio module works.

Description

Detection system, T-BOX and vehicle

Technical Field

The present application relates to the technical field of detection circuits, and in particular to a detection system, a T-BOX and a vehicle.

Background technique

The car realizes the audio function through the speaker circuit, which generally includes a processor, an audio module and a speaker connected in sequence. The processor generates an audio signal and provides it to the speaker through the audio module. The speaker then converts the audio signal into a sound signal, so that sound can be produced.

However, during the automobile production process, transportation and assembly, and after a certain period of use by the user, the speaker in the speaker circuit may fail. There may be many kinds of failures, such as: the speaker is short-circuited to the ground, the speaker is short-circuited to the power supply, the speaker is open-circuited, the speaker wires are short-circuited, etc.

The existing detection method usually connects a resistor in series with the positive port of the speaker and pulls it up to the test power supply, and connects a resistor in series with the negative port and pulls it down to the ground terminal, thereby treating the speaker as a resistive load and using the resistor voltage divider principle to detect whether the speaker is faulty. However, the DC and AC signals output by the audio module when working will interfere with the detection, resulting in a failure to diagnose. Therefore, the existing detection method can only be applied to the case where the audio module is not working.

Therefore, there is an urgent need for a detection system that can detect the speaker when the audio module is working.

Summary of the invention

The present application provides a detection system, a T-BOX and a vehicle, which realize the purpose of fault detection of the speaker when the audio module is working, and can detect whether the speaker has faults such as short circuit to ground, short circuit to power supply, short circuit between speaker wires, and open circuit of the speaker.

In order to achieve the above objectives, this application adopts the following technical solutions:

In a first aspect, a detection system is provided, the detection system is connected to a speaker, and the detection system includes: a processor and an audio module connected to each other, and a detection circuit connected to both the processor and the audio module; the audio module includes an audio power amplifier having an audio positive differential output terminal and an audio negative differential output terminal, the speaker has a positive port and a negative port, the audio positive differential output terminal is connected to the positive port, and the audio negative differential output terminal is connected to the negative port;

The detection circuit is used to collect a first current transmitted between the audio positive differential output terminal and the positive port, and is used to collect a second current transmitted between the negative port and the audio negative differential output terminal;

The detection circuit is also used to provide first information to the processor according to the first current and the second current, and the first information is used by the processor to determine whether a first fault occurs in the speaker.

The detection system provided in the first aspect collects the first current transmitted between the audio positive differential output terminal of the audio power amplifier and the positive port of the speaker, and the second current transmitted between the audio negative differential output terminal and the negative port of the speaker through the detection circuit in the detection system, and then provides the first information to the processor according to the first current and the second current, so that the processor can determine whether the speaker has a first fault. In the detection system, when the audio module is working, the DC signal and AC signal output by the audio power amplifier will not interfere with the current collection, so that the detection system can realize fault detection of the speaker when the audio module is working.

In a possible implementation of the first aspect, the detection system includes: a first current acquisition circuit connected in series between the audio positive differential output terminal and the positive port, and a second current acquisition circuit connected in series between the audio negative differential output terminal and the negative port; the first current acquisition circuit is used to collect the first current transmitted between the audio positive differential output terminal and the positive port and provide it to the processor, and the second current acquisition circuit is used to collect the second current transmitted between the negative port and the audio negative differential output terminal and provide it to the processor.

In a possible implementation of the first aspect, the detection system further includes: a current comparison circuit having three connection ports, the three connection ports of the current comparison circuit being respectively connected to the first current acquisition circuit, the second current acquisition circuit, and the processor; the current comparison circuit is used to determine the current difference between the first current and the second current, and accordingly, the first information includes the current difference. In this implementation, the current comparison circuit can be used to calculate the current difference between the first current and the second current, whereby the processor is only used to perform fault judgment based on the current difference obtained by the calculation, thereby reducing the amount of calculation of the processor and improving processing efficiency.

In a possible implementation of the first aspect, the detection system further includes: a voltage acquisition circuit connected to the positive port and the negative port of the speaker; the voltage acquisition circuit is used to acquire the voltage difference between the positive port and the negative port, and accordingly, the first information includes the first current, the second current and the voltage difference. In this implementation, the processor combines the voltage difference with the first current and the second current according to the voltage difference acquired by the voltage acquisition circuit to calculate the corresponding resistance of the speaker, so that it can more accurately determine whether the speaker is faulty according to the size of the speaker resistance, so as to improve the accuracy of the judgment.

In a possible implementation of the first aspect, the processor is further used to generate a sub-audio signal and provide it to the speaker through the audio module, and the frequency of the sub-audio signal is different from the frequency of the audio signal. In this implementation, when the speaker does not play sound, it is possible to determine whether the speaker is faulty by detecting the first current, the second current, and the voltage difference collected when the sub-audio signal is transmitted, so that the speaker circuit can be detected when the audio module does not output an audio signal.

In a possible implementation of the first aspect, the detection system further includes: a bias circuit, the bias circuit is connected to the audio positive differential output terminal and the audio negative differential output terminal respectively; when the audio module is not working, the bias circuit is used to apply a bias voltage to the circuit loop where the first current acquisition circuit, the speaker and the second current acquisition circuit are located, and the processor is used to determine whether the speaker has a first fault according to the first current collected by the first current acquisition circuit, the second current collected by the second current acquisition circuit, and the voltage difference collected by the voltage acquisition circuit when applying the bias voltage. In this implementation, when the audio module is not working, the bias circuit can be used to apply a bias voltage to determine whether the speaker has a first fault.

In a possible implementation of the first aspect, the first current acquisition circuit includes: a first resistor and a first differential operational amplifier; the first resistor is connected in series between the audio positive differential output terminal and the positive port, and the two input terminals of the first differential operational amplifier are respectively connected to the two ends of the first resistor; the first differential operational amplifier is used to determine a first voltage difference between the two ends of the first resistor and provide it to a processor, and the processor is used to determine a first current based on the first voltage difference and the first resistor.

In a possible implementation of the first aspect, the second current acquisition circuit includes: a second resistor and a second differential operational amplifier, the second resistor is equal to the first resistor; the second resistor is connected in series between the audio negative differential output terminal and the negative port, and the two input terminals of the second differential operational amplifier are respectively connected to the two ends of the second resistor; the second differential operational amplifier is used to determine the second voltage difference across the second resistor and provide it to the processor, and the processor is used to determine the second current according to the second voltage difference and the second resistor.

In a possible implementation of the first aspect, the current comparison circuit includes: a third differential operational amplifier; two input terminals of the third differential operational amplifier are respectively connected to the output terminal of the first differential operational amplifier and the output terminal of the second differential operational amplifier; the third differential operational amplifier is used to determine a third voltage difference between the first voltage difference and the second voltage difference and provide it to a processor, and the processor is used to determine the current difference based on the third voltage difference, the first resistor or the second resistor.

In a possible implementation of the first aspect, the voltage acquisition circuit includes: a fourth differential operational amplifier, two input terminals of the fourth differential operational amplifier are respectively connected to the positive port and the negative port of the speaker; the fourth differential operational amplifier is used to determine a fourth voltage difference between the positive port and the negative port of the speaker and provide it to the processor.

In a possible implementation of the first aspect, the bias circuit includes: a bias voltage terminal, a first bias resistor, a second bias resistor and a ground terminal; the first end of the first bias resistor is connected to the bias voltage terminal, the second end of the first bias resistor is connected to the audio positive differential output terminal, the first end of the second bias resistor is connected to the audio negative differential output terminal, and the second end of the second bias resistor is connected to the ground terminal.

In a possible implementation manner of the first aspect, the first fault includes a speaker short circuit to a power supply, a speaker short circuit to a ground, a speaker open circuit, or a speaker wire short circuit.

In a second aspect, an electronic device is provided, comprising a detection system and a speaker connected to each other, wherein the detection system is a detection system provided in the first aspect or any possible implementation of the first aspect.

In a third aspect, a T-BOX is provided, comprising a detection system as provided in the first aspect or any possible implementation of the first aspect.

In a possible implementation manner of the third aspect, the T-BOX further includes a speaker connected to the detection system.

In a fourth aspect, a vehicle is provided, comprising the T-BOX provided in the third aspect or any possible implementation of the third aspect.

In a fifth aspect, a vehicle is provided, comprising a T-BOX and a detection system connected to each other, wherein the detection system is a detection system provided in the first aspect or any possible implementation of the first aspect.

In a possible implementation of the fifth aspect, the vehicle also includes a horn connected to the detection system.

The detection system, T-BOX and vehicle provided by the present application collect the first current transmitted between the audio positive differential output terminal of the audio power amplifier and the positive port of the speaker, and the second current transmitted between the audio negative differential output terminal and the negative port of the speaker through the detection circuit in the detection system, and then, the processor compares the magnitude of the first current and the second current to determine whether the speaker circuit has a fault of the speaker short-circuited to the ground or the speaker short-circuited to the power supply, and then combines the voltage difference at both ends of the speaker to detect whether the speaker circuit has a fault of the speaker open circuit or the speaker wire short circuit. Because, when the audio module is working, the DC signal and AC signal output by the audio power amplifier will not interfere with the collection of current and voltage, so that the circuit can achieve the purpose of fault detection of the speaker circuit when the audio module is working.

In addition, sub-audio signals and bias circuits are added to detect whether the speaker is faulty when there is no sound or the audio module is not working, so as to increase the comprehensiveness of the detection.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

FIG2 is a schematic diagram of the structure of a T-BOX provided in an embodiment of the present application;

FIG3 is a schematic diagram of a connection between an existing detection system and a speaker;

FIG4 is a schematic diagram of another conventional detection system and a speaker connection;

FIG5 is a schematic diagram of a connection between another conventional detection system and a speaker;

FIG6 is a schematic diagram of a connection between a detection system and a speaker provided in an embodiment of the present application;

FIG7 is a schematic diagram of another connection between a detection system and a speaker provided in an embodiment of the present application;

FIG8 is a schematic diagram of a connection between another detection system and a speaker provided in an embodiment of the present application;

FIG9 is a schematic diagram of a connection between another detection system and a speaker provided in an embodiment of the present application;

FIG10 is a schematic diagram of a connection between another detection system and a speaker provided in an embodiment of the present application;

FIG11 is a schematic diagram of a connection between another detection system and a speaker provided in an embodiment of the present application;

FIG12 is a schematic diagram of the structure of a first current acquisition circuit provided in an embodiment of the present application;

FIG13 is a schematic diagram of an equivalent structure of the speaker in FIG11 when the speaker is short-circuited to ground or short-circuited to power supply;

FIG. 14 is a schematic diagram of a connection between another detection system and a speaker provided in an embodiment of the present application.

Reference numerals:

1-terminal device; 2-detection system; 20-detection circuit; 100-T-BOX; 110-processor; 120-audio module; 121-audio decoder; 122-audio power amplifier; 200-speaker; 210-first current acquisition circuit; 211-first op amp circuit; 220-second current acquisition circuit; 230-current comparison circuit; 240-bias circuit; SPKP-audio positive differential output terminal; SKPN-audio negative differential output terminal; VCC-bias voltage terminal; GND-connection Ground; RL-speaker resistor; R11-first resistor; R12-second resistor; I_SPKP-first current; I_SPKN-second current; OP1-first differential operational amplifier; OP2-second differential operational amplifier; OP3-third differential operational amplifier; OP4-fourth differential operational amplifier; RS1-first equivalent resistor; RS2-second equivalent resistor; RT1-first bias resistor; RT2-second bias resistor; SW1-first switch; SW2-second switch; BAT-power supply.

Detailed ways

The technical solution in this application will be described below in conjunction with the accompanying drawings.

In the description of the embodiments of the present application, unless otherwise specified, "/" means or, for example, A/B can mean A or B; "and/or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this embodiment, unless otherwise specified, "plurality" means two or more.

In addition, in the present application, directional terms such as "left" and "right" may be defined including but not limited to the orientation relative to the schematic placement of components in the drawings. It should be understood that these directional terms may be relative concepts. They are used for relative description and clarification, and may change accordingly according to changes in the orientation of the components in the drawings.

In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, the term "electrical connection" can be a way of achieving electrical connection for signal transmission. "Electrical connection" can be a direct electrical connection or an indirect electrical connection through an intermediate medium.

The technical solution of the embodiment of the present application can be applied to various terminal devices. For example, the terminal device in the embodiment of the present application can be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an augmented reality (AR)/virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc. The embodiment of the present application does not impose any restrictions on the specific type of the terminal device.

Taking the terminal device as a vehicle-mounted device as an example, Figure 1 shows a schematic diagram of the structure of a terminal device provided by an embodiment of the present application. As shown in Figure 1, a detection system 2 and a plurality of speakers 200 connected to the detection system 2 are provided on the terminal device 1. The detection system 2 includes a processor 110 and an audio module 120 connected thereto, and a detection circuit 20 electrically connected to the processor 110 and the audio module 120. The detection system 2 is used to detect the speakers 200.

In the terminal device 1, the audio module 120 is connected to the speaker 200. Therefore, the processor 110 can generate an audio signal and provide it to the speaker 200 through the audio module 120, and the speaker 200 converts the audio signal into a sound signal, thereby realizing the audio function, so that the user can use the terminal device 1 to listen to music or broadcast, etc.

When a manufacturer produces a vehicle, the processor 110, the audio module 120 and the detection circuit 20 in the detection system 2 may generally be set at the center console position in the vehicle, and the speaker 200 connected to the audio module 120 is installed on the vehicle door. As shown in FIG1 , the vehicle is provided with four speakers 200, which are respectively installed on the left and right front doors and the left and right rear doors of the vehicle. In this way, during use, the processor 110 generates an audio signal and provides the audio signal to the four speakers 200 through the audio module 120, so that the four speakers 200 located at different positions can not only realize the audio function in the vehicle, but also form a good sound effect, which can improve the user experience.

Of course, the number and location of the horns on different vehicle models may be different, and the number and location may be changed as needed, and this application does not impose any restrictions on this.

The structure of the detection system 2 in FIG. 1 is described below.

It should be understood that the detection system 2 can be set in the vehicle's on-board communication box (telematics box, T-BOX), and the speaker 200 connected to the detection system 2 is set outside the T-BOX, or, the detection system 2 and the speaker 200 connected thereto can both be set in the T-BOX, or, the detection system 2 can also be set outside the T-BOX and only connected to the T-BOX.

Taking the detection system 2 and the speaker 200 connected to the detection system 2 as an example, both are arranged in the T-BOX, FIG2 shows a schematic diagram of the structure of a T-BOX provided in an embodiment of the present application. FIG2 shows only one speaker 200 as an example.

As shown in Figure 2, the T-BOX includes a detection system 2 and a speaker 200 connected to each other. The detection system 2 includes a processor 110 and an audio module 120, and a detection circuit 20 connected to both the processor 11 and the audio module 120. The audio module 120 may include an audio decoder 121 and an audio power amplifier 122.

T-BOX is used to provide solutions for wireless communication applied in vehicles, including second generation (2G), third generation (3G), fourth generation (4G), fifth generation (5G), wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR), etc. T-BOX may include at least one filter, switch, power amplifier, low noise amplifier (LNA), etc. T-BOX can receive electromagnetic waves through antennas, and filter and amplify the received electromagnetic waves. T-BOX can also amplify the modulated signal and convert it into electromagnetic waves for radiation through antennas. T-BOX can be one or more devices integrating at least one communication processing module.

The processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and/or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

The controller can generate operation control signals according to the instruction operation code and timing signal to complete the control of instruction fetching and execution.

The processor 110 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may store instructions or data that the processor 110 has just used or cyclically used. If the processor 110 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

In some embodiments, the processor 110 may include one or more interfaces, such as an inter-integrated circuit sound (I2S) interface.

The I2S interface can be used for audio communication. In some embodiments, the processor 110 can include multiple I2S buses. The processor 110 can be coupled to the audio module 120 via the I2S bus to achieve communication between the processor 110 and the audio module 120.

It should be understood that the interface connection relationship between the modules illustrated in the embodiment of the present invention is only a schematic illustration and does not constitute a structural limitation on the T-BOX. In other embodiments of the present application, the T-BOX may also adopt a different interface connection method from the above embodiments, or a combination of multiple interface connection methods.

The vehicle-mounted device implements audio functions through the audio module 120 , the speaker 200 , and the application processor.

The audio module 120 is used to convert digital audio information into analog audio signal output, and can also be used to convert analog audio input into digital audio signals. The audio module 120 can also be used to encode and decode audio signals, and/or, to power amplify audio signals. In some embodiments, the audio module 120 can be arranged in the processor 110, or some functional modules of the audio module 120 can be arranged in the processor.

The speaker 200 , also called a loudspeaker, has a positive terminal and a negative terminal, and is used to convert an audio signal into a sound signal.

As shown in FIG. 2 , the audio power amplifier 122 in the audio module 120 has an audio positive differential output terminal and an audio negative differential output terminal. As shown in FIG. 2 , SPKP is used to represent the audio positive differential output terminal, and SPKN is used to represent the audio negative differential output terminal. The audio positive differential output terminal SPKP of the audio power amplifier 122 is electrically connected to the positive port of the speaker 200, and the audio negative differential output terminal SPKN of the audio power amplifier 122 is electrically connected to the negative port of the speaker 200. The audio decoder 121 in the audio module 120 decodes the audio signal output by the processor 110, and provides the decoded audio signal to the audio power amplifier 122 for amplification. Then, the audio power amplifier 122 provides the amplified audio signal to the positive port and the negative port of the speaker 200 through the audio positive differential output terminal SPKP and the audio negative differential output terminal SPKN. As a result, the speaker 200 converts the audio signal into a sound signal for sounding after receiving it.

It should be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the T-BOX. In other embodiments of the present application, the T-BOX may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

A speaker in a speaker circuit composed of a processor, an audio module, and a speaker connected in sequence, or a stand-alone speaker, may fail during the production process, during transportation and assembly, or after a certain period of use by the user. There may be many types of failures, such as a speaker short circuit to ground, a speaker short circuit to a power source, a speaker wire short circuit, or a speaker open circuit. At this point, the speaker needs to be tested to determine what the failure is, so as to facilitate subsequent targeted repairs of the failure.

It should be understood that the speaker short circuit to ground refers to the positive terminal of the speaker short circuit to the ground terminal or the negative terminal of the speaker short circuit to the ground terminal. The speaker short circuit to power supply refers to the positive terminal of the speaker short circuit to the power supply or the negative terminal of the speaker short circuit to the power supply. The speaker line short circuit refers to the short circuit caused by the direct connection between the positive terminal and the negative terminal of the speaker, and the speaker open circuit refers to the disconnection between the positive terminal and the negative terminal inside the speaker.

Then, in order to perform fault detection on a speaker, various structures of detection circuits 20 have been proposed in the prior art. Three types of detection circuits 20 are described below as examples.

FIG3 shows a schematic diagram of a connection between an existing detection system 2 and a speaker 200. As shown in FIG3, the detection circuit 20 in the detection system 2 is arranged between the audio power amplifier 122 and the speaker 200. The detection circuit 20 includes a resistor R1 and a switch SW, wherein a first end of the resistor R1 is connected to the bias voltage terminal VCC, and a second end is connected to the positive electrode port of the speaker 200, and a first end of the switch SW is connected to the negative electrode port of the speaker 200, and a second end is connected to the ground terminal GND.

When the switch SW is closed, a bias voltage is applied to the bias voltage terminal VCC, and the speaker 200 can be regarded as a load impedance RL, so that a conduction loop can be formed between the bias voltage terminal VCC and the ground terminal GND through the resistor R1 and the speaker resistor RL.

Based on the conductive loop shown, a detection line can be connected to the positive terminal of the speaker 200 to detect the voltage divided when the speaker 200 acts as a load impedance RL, and then according to the voltage divided by the speaker 200, whether the speaker 200 is faulty can be detected.

For example, when a voltage of 1 V is applied to the bias voltage terminal VCC, the voltage value obtained by the detection line connected to the positive terminal of the speaker 200 can be calculated according to formula (1).

In formula (1), VDET0 represents the voltage value obtained by the detection line connected to the positive terminal of the speaker 200.

According to formula (1), if the speaker 200 is normal, the voltage value VDET should be an intermediate level between 0V and 1V; if a short circuit occurs between the two ends of the speaker 200, the speaker resistance RL1 will become smaller, and the voltage value VDET will be close to 0V; if an open circuit occurs between the two ends of the speaker 200, the voltage value VDET will be pulled up to 1V. Therefore, the principle of resistance voltage division can be used to detect whether the corresponding state of the speaker is normal or a short circuit or open circuit fault occurs.

FIG4 shows a schematic diagram of the structure of another existing detection system 2. As shown in FIG4, the detection circuit 20 in the detection system 2 is arranged between the audio power amplifier 122 and the speaker 200. The detection circuit 20 includes a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6. Among them, the first end of the resistor R2 is connected to the bias voltage terminal VCC, and the second end is connected to the first node P1; the first end of the resistor R3 is connected to the first node P1, and the second end is connected to the second node P2; the first end of the resistor R4 is connected to the second node P2, and the second end is connected to the positive terminal of the speaker; the first end of the resistor R5 is connected to the first node P1, and the second end is connected to the ground terminal GND; the first end of the resistor R6 is connected to the negative terminal of the speaker 200, and the second end is connected to the ground terminal GND.

When a bias voltage is applied to the bias voltage terminal VCC, if the speaker 200 is regarded as a resistor RL, the resistor R2 and the resistor R5 form a first loop L1 connected between the bias voltage terminal VCC and the ground terminal GND; the resistor R3, the resistor R4, the resistor RL2 corresponding to the speaker, and the resistor R6 form a second loop L2 connected between the bias voltage terminal VCC and the ground terminal GND.

Based on the first circuit L1 shown, a detection line can be connected externally from the first node P1 to detect the voltage divided by the resistor R5; based on the second circuit L2 shown, another detection line can be connected externally from the second node P2 to detect the voltage divided by the resistor R4, the resistor RL2 corresponding to the speaker, and the resistor R6, and then by comparing the voltages measured at the first node P1 and the second node P2, it can be detected whether the speaker 200 is faulty.

For example, when a voltage of 10 V is applied to the bias voltage terminal VCC, the voltage value obtained from the first node P1 can be obtained according to formula (2), and the voltage value obtained from the second node P2 can be obtained according to formula (3).

In formula (2), VDET1 represents the voltage value obtained from the first node P1, and in formula (3), VDET2 represents the voltage value obtained from the first node P1.

According to formula (2) and formula (3), if the speaker 200 is connected normally, the voltage value VDET1 and the voltage value VDET2 should be an intermediate level between 0V and 10V, and the voltage value VDET1 should be greater than the voltage value VDET2; if a short circuit occurs between the two ends of the speaker 200, the speaker resistance RL2 will decrease, and thus, compared with the normal state, the voltage value VDET1 corresponding to the short circuit will remain unchanged, but the voltage value VDET2 will decrease, and the difference between the voltage value VDET1 and the voltage value VDET2 will increase; if the two ends of the speaker 200 are open, there is no current in the second circuit L2, and thus, the voltage value VDET2 will be equal to the voltage value VDET1. Therefore, by comparing the voltages at the first node P1 and the second node P2, it is possible to detect whether the corresponding state of the speaker is normal or a short circuit or open circuit fault occurs.

The two existing detection systems 2 shown in FIG. 3 and FIG. 4 are both connected in series with a resistor at the positive port of the speaker 200 and pulled up to the bias voltage terminal, and the negative port is pulled down to the ground terminal, and then the speaker 200 is used as a load impedance, and the principle of resistance voltage division is used to detect whether the speaker 200 is faulty. Although the detection circuit 20 shown in FIG. 3 and FIG. 4 can detect the connection status of the two ends of the speaker 200, it is based on the case where the audio module is not working. If the audio module 120 is working, the DC signal and AC signal output by the audio positive differential output terminal SPKP and the audio negative differential output terminal SPKN of the audio power amplifier 122 in the audio module 120 will interfere with the detection. According to the detection voltage obtained by the detection circuit 20 shown in FIG. 3 and FIG. 4, it is actually impossible to know whether it is the voltage output by the audio power amplifier 122 or the voltage corresponding to the speaker 200 when the load impedance is divided, which causes the detection circuit 20 shown in FIG. 3 and FIG. 4 to be unable to be used for fault detection of the speaker 200 when the audio module 120 is working.

FIG5 shows a schematic diagram of another existing detection system 2 and a speaker 200. As shown in FIG5, a part of the detection circuit 20 in the detection system 2 has the same structure as the detection circuit 20 shown in FIG3, and will not be described in detail here. However, during the detection, the audio power amplifier 122 is used to determine whether the state corresponding to the speaker is a short circuit or an open circuit between lines. Then, the audio power amplifier 122 outputs the detection result from a port (such as port D shown in FIG5). This method completely relies on the internal diagnostic function of the audio power amplifier 122.

In addition, the two wires connecting the audio power amplifier 122 and the speaker 200 are also connected to the voltage collection circuit, and the voltage collection circuit is connected to the voltage comparison circuit. The voltage collection circuit is used to collect the voltages corresponding to the positive port and the negative port of the speaker 200, respectively, and the voltage comparison circuit is used to compare the two voltages, so that when the bias voltage is applied, according to the output result of the voltage comparison circuit, it can be detected whether the connection state of the two ends of the speaker is short-circuited to the power supply or short-circuited to the ground. Although the above-mentioned Figure 5 can detect two more faults of whether the speaker is short-circuited to the power supply or short-circuited to the ground relative to Figures 3 and 4, it is only applicable to the case where the audio module 120 is not working, and cannot detect the speaker fault when the audio module 120 is working.

Therefore, there is an urgent need for a detection system that can detect the speaker when the audio module is working.

In view of this, the present application provides a detection system, which collects a first current transmitted between the audio positive differential output terminal of the audio power amplifier and the positive port of the speaker, and a second current transmitted between the audio negative differential output terminal and the negative port of the speaker through a detection circuit in the detection system, and then provides first information to a processor based on the first current and the second current, so that the processor can determine whether a first fault occurs in the speaker circuit. In the detection system, when the audio module is working, the DC signal and AC signal output by the audio power amplifier will not interfere with the current collection, so that the circuit can realize fault detection of the speaker when the audio module is working.

The detection system 2 provided in the embodiment of the present application is described in detail below in conjunction with Figures 6 to 14.

Fig. 6 shows a schematic diagram of the connection between a detection system 2 and a speaker 200 provided in an embodiment of the present application. The detection system 2 is connected to the speaker 200.

As shown in Figure 6, the detection system 2 includes a connected processor 110 and an audio module 120, and a detection circuit 20 connected to both the processor 110 and the audio module 120. The audio module 120 includes an audio power amplifier 122 having an audio positive differential output terminal SPKP and an audio negative differential output terminal SPKN. The speaker 200 has a positive port and a negative port. The audio positive differential output terminal SPKP is electrically connected to the positive port of the speaker 200, and the audio negative differential output terminal SPKN is electrically connected to the negative port of the speaker 200. The processor 110 is used to generate an audio signal and provide it to the speaker 200 through the audio module 120. The speaker 200 is used to convert the audio signal into a sound signal and play it.

In the embodiment of the present application, the audio module 120 may generally further include an audio decoder 121, the input end of the audio decoder 121 is electrically connected to the processor 110, and the output end is electrically connected to the audio power amplifier 122. At this time, the processor 110 is used to generate an audio signal and provide it to the audio decoder 121 for decoding, and then amplified by the audio power amplifier 122 and transmitted to the speaker 200.

The detection circuit 20 is used to collect a first current transmitted between the audio positive differential output terminal SPKP and the positive electrode port, and is used to collect a second current transmitted between the negative electrode port and the audio negative differential output terminal.

The detection circuit 20 is further used to provide first information to the processor 110 according to the first current and the second current. The first information is used by the processor 110 to determine whether a first fault occurs in the speaker circuit 10 .

Optionally, in an embodiment of the present application, the first fault includes the speaker being short-circuited to a power source or the speaker being short-circuited to ground.

The detection system provided in the embodiment of the present application collects the first current transmitted between the audio positive differential output terminal of the audio power amplifier and the positive port of the speaker, and the second current transmitted between the audio negative differential output terminal and the negative port of the speaker through the detection circuit in the detection system, and then provides the first information to the processor according to the first current and the second current, so that the processor can determine whether the speaker circuit has a first fault. In the detection system, when the audio module is working, the DC signal and AC signal output by the audio power amplifier will not interfere with the current collection, so that the circuit can realize fault detection of the speaker when the audio module is working.

Optionally, in the embodiment of the present application, the detection circuit 20 in FIG. 6 may include:

A first current collection circuit 210 is connected in series between the audio positive differential output terminal SPKP and the positive electrode port, and a second current collection circuit 220 is connected in series between the audio negative differential output terminal SPKN and the negative electrode port.

The first current acquisition circuit 210 is used to acquire the first current transmitted between the audio positive differential output terminal SPKP and the positive terminal and provide it to the processor 110. The second current acquisition circuit 220 is used to acquire the second current transmitted between the negative terminal and the audio negative differential output terminal SPKN and provide it to the processor 110.

It should be understood that at this time, the first information includes the first current and the second current. After the detection circuit 20 provides the first current and the second current to the processor 110, the processor 110 can determine whether the speaker circuit 10 has a first fault based on the first current and the second current.

It should be understood that, in conjunction with FIG6 , when the audio module 120 is working, the circuit loop formed between the audio positive differential output terminal SPKP of the audio power amplifier 122, the speaker 200, and the audio negative differential output terminal SPKN will be turned on, and the speaker 200 can be regarded as a load impedance RL connected in series in the circuit loop. Therefore, according to the principle that current is equal everywhere, the first current transmitted between the audio positive differential output terminal SPKP and the positive electrode port and the second current transmitted between the negative electrode port and the audio negative differential output terminal SPKN should be opposite in direction, and the current values should be equal and non-zero, and also equal to the current value passing through the speaker 200.

As an example, if the speaker 200 is short-circuited to the ground, a circuit loop will be formed in which the speaker 200 is connected to the ground terminal GND, forming a current branch, resulting in the magnitude of the first current being greater than the second current.

As another example, if the speaker 200 is short-circuited to the power supply, a circuit loop will be formed in which the power supply is connected to the speaker 200, increasing the current, causing the magnitude of the second current to be greater than the first current.

Therefore, the processor 110 can compare the first current collected by the first current acquisition circuit 210 with the second current collected by the second current acquisition circuit 220, so that when the audio module 120 is working, it can determine whether the speaker 200 has a short circuit to the ground or a short circuit to the power supply based on the magnitude of the first current and the second current.

Optionally, FIG7 shows a schematic diagram of another connection between a detection system 2 and a speaker 200 provided in an embodiment of the present application. As shown in FIG7, based on FIG6, the detection circuit 20 further includes: a current comparison circuit 230 having three connection ports. As shown in FIG7, the three connection ports are m1, m2 and m3 respectively.

The three connection ports of the current comparison circuit 230 are electrically connected to the first current acquisition circuit 210 , the second current acquisition circuit 220 , and the processor 110 , respectively.

The current comparison circuit 230 is used to determine the current difference between the first current and the second current and provide the current difference to the processor 110. The processor 110 is used to determine whether the speaker circuit 10 has a first fault according to the current difference between the first current and the second current.

It should be understood that, at this time, the first information is the current difference between the first current and the second current.

It should be understood that, in combination with Figure 7, when the audio module 120 is working, if the first current is in opposite directions to the second current and the current difference is zero, it means that the magnitude of the first current is equal to the second current and is not zero. At this time, it can be determined that the speaker circuit 10 does not have a fault of the speaker short-circuited to the ground or the speaker short-circuited to the power supply.

If the first current and the second current are in opposite directions, the current difference is a positive value, and the magnitude of the first current is greater than the second current, it means that the current in the circuit is shunted, which may cause the magnitude of the first current to be greater than the second current. Therefore, the processor 110 can determine that the speaker has a short-circuit to ground fault; if the first current and the second current are in opposite directions, the current difference is a negative value, and the magnitude of the first current is less than the second current, it means that the current is increased in the circuit, which causes the magnitude of the first current to be less than the second current. Therefore, the processor 110 can determine that the speaker has a short-circuit to the power supply fault.

Based on Figure 6, the current comparison circuit 230 added in Figure 7 can be used to calculate the current difference between the first current and the second current. At this time, the processor 110 is only used to perform fault judgment based on the calculated current difference, which reduces the calculation amount of the processor 110 and improves processing efficiency.

In the embodiment of the present application, the current difference threshold range corresponding to different faults can also be preset in the processor 110, so that after the current comparison circuit 230 determines the current difference, the processor 110 can determine the fault corresponding to the current difference according to the threshold range matched by the current difference, thereby improving the diagnostic efficiency. Among them, the current difference threshold range can be set and modified as needed, and the present application does not impose any restrictions on this.

Optionally, Fig. 8 shows a schematic diagram of the connection between another detection system 2 provided in an embodiment of the present application and a speaker 200. As shown in Fig. 8, based on Fig. 7, the detection circuit 20 further includes: a voltage collection circuit 240 connected to the positive and negative ports of the speaker 200.

The voltage collection circuit 240 is used to collect the voltage difference between the positive port and the negative port of the speaker 200, and the processor 110 is used to determine whether a first fault occurs in the speaker circuit according to the first current, the second current and the voltage difference.

It should be understood that, at this time, the first information includes the first current, the second current and the voltage difference.

Optionally, in the embodiment of the present application, the first fault may also include an open circuit of the speaker or a short circuit between speaker wires.

It should be understood that, since the first current collection circuit 210 is connected in series between the audio positive differential output terminal SPKP of the audio power amplifier 122 and the positive port of the speaker 200, and the second current collection circuit 220 is connected in series between the audio negative differential output terminal SPKN and the negative port of the speaker 200, the first current collection circuit 210, the speaker 200 and the second collection circuit 220 form a series circuit loop, and the voltage between the audio positive differential output terminal SPKP and the audio negative differential output terminal SPKN of the audio power amplifier 122 is divided. At this time, the voltage collected by the voltage collection circuit 240 connected to the positive port and the negative port of the speaker 200 is not the voltage output by the audio power amplifier 122, but the voltage divided when the speaker 200 is used as a load impedance. Therefore, when the audio module 120 is working, the voltage collection circuit 240 can accurately collect the voltage divided when the speaker 200 is used as a load impedance, without being affected by the output of the audio power amplifier 122.

8 , when the audio module 120 is working, if the voltage difference value collected by the voltage collection circuit 240 is close to zero, it means that a short circuit has occurred in the speaker 200, resulting in a particularly small voltage difference value. Thus, the processor 110 can determine that a short circuit has occurred in the speaker circuit 10; if the voltage difference value is particularly large, or even close to the voltage difference value output by the audio module 120, it means that an open circuit has occurred in the speaker. Thus, the processor 110 can determine that an open circuit has occurred in the speaker. If the voltage difference value is greater than zero but less than the voltage output by the audio module 120, it means that the speaker is working normally. Thus, the processor 110 can determine that the speaker is normal.

Since the speaker 200 has a relatively small resistance when used as a load impedance, the voltage difference alone may not be able to distinguish between the normal operation of the speaker 200 and the short circuit between the speaker wires. Therefore, in order to detect more accurately, the voltage difference determined in FIG. 8 and the current difference determined in FIG. 6 or FIG. 7 may be combined for fault judgment.

For example, assuming that a short circuit occurs between the lines of speaker 200, speaker 200 can be regarded as a resistor with a resistance value less than a first threshold value; assuming that an open circuit occurs in speaker 200, it can be considered that the circuit is still conductive, but speaker 200 can be regarded as a resistor with a resistance value greater than a second threshold value; assuming that speaker 200 works normally, speaker 200 can be regarded as a resistor with a resistance value greater than the first threshold value but less than the second threshold value.

In conjunction with Figure 8, when the audio module 120 is working, if the first current collected by the first current acquisition circuit 210 and the second current collected by the second current acquisition circuit 220 are opposite in direction and equal in magnitude, then, they should also be equal to the current value passing through the speaker 200. Therefore, the processor 110 can calculate the ratio of the voltage difference to the first current based on the measured voltage difference between the positive port and the negative port of the speaker 200, or calculate the ratio of the voltage difference to the second current as the ratio of the voltage difference to the current value passing through the speaker 200, thereby obtaining the speaker resistance RL corresponding to the speaker 200, and then, determine whether the first fault occurs based on the size of the calculated speaker resistance RL.

Therefore, if the calculated speaker resistance RL is greater than the second threshold, it means that an open circuit fault has occurred in the speaker; if the calculated speaker resistance RL is less than the first threshold, it means that a short circuit fault has occurred between the speaker wires; if the calculated speaker resistance RL is greater than the first threshold but less than the second threshold, it means that the speaker is working normally.

In the embodiment of the present application, the sizes of the first threshold and the second threshold can be set and modified as needed, and the embodiment of the present application does not impose any restrictions on this.

In combination with the above example, the processor 110 can determine whether a speaker short-circuit to ground or a speaker short-circuit to power occurs based on the current difference between the first current and the second current, and can then accurately determine whether a speaker wire short-circuit or speaker open circuit occurs based on the voltage difference.

The detection circuit 20 of Figures 6 to 8 can solve various fault problems that may occur in the speaker when the audio module 120 is working normally. However, when the audio module 120 is not working normally, for example, there is no audio signal input or no audio signal output, it is impossible to determine whether the speaker 200 has a first fault. For this reason, the embodiment of the present application provides a detection circuit 20 to solve this problem.

Fig. 9 shows a schematic diagram of the structure of another detection system 2 and a speaker 200 provided in an embodiment of the present application. As shown in Fig. 9, in addition to generating an audio signal, the processor 110 is also used to generate a sub-audio signal and output it to the speaker 200 through the audio module 120. The frequency of the sub-audio signal is different from the frequency of the audio signal.

Therefore, when the speaker 200 plays no sound, the processor 110 can determine whether the speaker has a first fault based on the first current collected by the first current acquisition circuit 210, the second current collected by the second current acquisition circuit 220, and the voltage difference collected by the voltage acquisition circuit 240 when the sub-audio signal is transmitted.

It should be understood that the frequency of the audio signal is generally between 200 Hz and 4.3 kHz. When the processor 110 generates an audio signal and transmits it to the speaker 200 through the audio module 120, the speaker 200 can convert it into a sound audible to the human ear. The frequency of the sub-audio signal is generally less than 10 Hz or greater than 20 kHz. When the processor 110 transmits the generated sub-audio signal to the speaker 200 through the audio module 120, it is imperceptible to the human ear.

Based on this principle, the processor 110 in the embodiment of the present application can generate a sub-audio signal while generating an audio signal, or enable the processor 110 to generate a sub-audio signal when there is no sound playing. In this way, when the audio module 120 is working normally, the speaker 200 plays the sound signal converted from the audio signal, and the sub-audio signal will not cause interference; when the speaker 200 is not playing sound, the audio module 120 has no audio signal input or no audio signal output, but the sub-audio signal can still be transmitted normally. Therefore, it is possible to determine whether the speaker has a first fault by detecting the first current collected by the first current acquisition circuit 210, the second current collected by the second current acquisition circuit 220, and the voltage difference collected by the voltage acquisition module 240 when the sub-audio signal is transmitted.

Optionally, Figure 10 shows a connection diagram of another detection system 2 provided in an embodiment of the present application and a speaker 200. As shown in Figure 10, based on Figure 8 or Figure 9, the detection circuit 20 may further include: a bias circuit 250, and the bias circuit 250 is electrically connected to the audio positive differential output terminal SPKP and the audio negative differential output terminal SPKN respectively.

In conjunction with Figure 10, when the audio module 120 is not working, the bias circuit 250 is used to apply a bias voltage to the circuit loop where the first current acquisition circuit 210, the speaker 200 and the second current acquisition circuit 220 are located, and the processor 110 is used to determine whether the speaker 200 has a first fault based on the first current collected by the first current acquisition circuit 210, the second current collected by the second current acquisition circuit 220 and the voltage difference collected by the voltage acquisition circuit 240 when applying the bias voltage.

It should be understood that if the audio module 120 is powered on for the first time, or the audio module 120 is in fault protection and does not work, after the bias voltage is applied to the bias circuit 250, the circuit loop formed by the first current acquisition circuit 210, the speaker 200 and the second current acquisition circuit 220 between the audio positive differential output terminal SPKP and the audio negative differential output terminal SPKN of the audio power amplifier 122 can be turned on, so that it can be determined whether the speaker 200 has a first fault based on the first current collected by the first current acquisition circuit 210, the second current collected by the second current acquisition circuit 220 and the voltage difference collected by the voltage acquisition circuit 240. Here, the process of determining whether the first fault has occurred can refer to the above description of Figures 6 to 9, and for the sake of brevity, it will not be repeated here.

The overall structure of the detection system 2 is described above in conjunction with FIG. 6 to FIG. 10 . The following will describe in detail the structure of each part of the detection circuit 20 in conjunction with FIG. 11 to FIG. 14 .

Optionally, Fig. 11 shows a schematic diagram of connection between another detection system 2 provided in an embodiment of the present application and a speaker 200. As shown in Fig. 11, the first current acquisition circuit 210 in the detection circuit 20 includes: a first resistor R11 and a first differential operational amplifier OP1.

The first resistor R11 is connected in series between the audio positive differential output terminal SPKP and the positive port, and the two input terminals of the first differential operational amplifier OP1 are electrically connected to the two ends of the first resistor R11 respectively; the first differential operational amplifier OP1 is used to determine the first voltage difference between the two ends of the first resistor R11 and provide it to the processor 110, and the processor 110 is used to determine the first current I_SPKP according to the first voltage difference and the first resistor R11.

It should be understood that the first voltage difference across the first resistor R11 determined by the first differential operational amplifier OP1 is the voltage divider of the first resistor R11. The ratio of the first voltage difference to the first resistor R11 calculated according to Ohm's law is the current value passing through the first resistor R11, that is, the first current I_SPKP transmitted between the audio positive differential output terminal SPKP and the positive port of the speaker 200.

The first current acquisition circuit 210 in FIG. 11 is described in detail below. FIG. 12 shows a schematic diagram of the structure of the first current acquisition circuit 210. As shown in FIG. 12, based on FIG. 11, the first current acquisition circuit 210 may further include: a resistor R21, a resistor R22, a resistor R23, a resistor R24, a capacitor C1, and a capacitor C2. The circuit formed by the resistor R21, the resistor R22, the resistor R23, the resistor R24, the capacitor C1, the capacitor C2 and the first differential operational amplifier OP1 is recorded as a first operational amplifier circuit 211.

Among them, the resistor R21 is connected in series between the first end a of the first resistor R11 and the inverting input terminal of the first differential operational amplifier OP1 (as shown in "-" in Figure 12), the resistor R22 is connected in series between the second end b of the first resistor R11 and the non-inverting input terminal of the first differential operational amplifier OP1 (as shown in "+" in Figure 12), the resistor R23 is connected in series between the inverting input terminal and the output terminal of the first differential operational amplifier OP1, the capacitor C1 is connected in parallel to the resistor R23, the resistor R24 is connected in series between the non-inverting input terminal of the first differential operational amplifier OP1 and the feedback voltage terminal VREF, and the capacitor C2 is connected in parallel to the resistor R24.

The calculation principle of the first operational amplifier circuit 211 is described below.

In the example shown in FIG. 12 , it can be seen from the virtual disconnection (assuming that the first differential operational amplifier is open circuited) that the current passing through the resistor R21 is equal to the current passing through the resistor R23. Similarly, the current passing through the resistor R22 is equal to the current passing through the resistor R24. Therefore, the following formulas (3) and (4) can be listed:

In formula (3), Va represents the voltage value at the first end a of the first resistor R11, V- represents the voltage value at the inverting input terminal of the first differential operational amplifier OP1, and Vout represents the voltage value at the output terminal of the first differential operational amplifier OP1. In formula (4), Vb represents the voltage value at the second end b of the first resistor R11, V+ represents the voltage value at the non-inverting input terminal of the first differential operational amplifier OP1, and Vref represents the voltage value of the feedback voltage terminal VREF.

If R21=R23 is set, formula (3) can be simplified to obtain formula (5);

If R22=R24 is set, formula (4) can be simplified to obtain formula (6);

From the virtual short (assuming that the two input terminals of the first differential operational amplifier are short-circuited), we can get formula (7);

V+＝V- (7)

Combining formula (5), formula (6) and formula (7), we can get formula (8);

Vout＝Vb-Va+Vref (8)

If we assume that the value of Vref is 0, we can simplify formula (8) to get formula (9);

Vout＝Vb-Va (9)

According to formula (9), the voltage value outputted from the output terminal of the first differential operational amplifier OP1 in the first operational amplifier circuit 211 is the first voltage difference between the two ends of the first resistor R11.

It should be understood that the above is merely an example of the first operational amplifier circuit 211, and other structures with the same functions as the first operational amplifier circuit 211 are not described here one by one, but should all fall within the protection scope of this application.

Optionally, in the embodiment of the present application, as shown in Fig. 11, the second current acquisition circuit 220 in the detection circuit 20 includes: a second resistor R12 and a second differential operational amplifier OP2. The second resistor R12 is equal to the first resistor R11.

The second resistor R12 is connected in series between the audio negative differential output terminal SPKN and the negative electrode port, and the two input terminals of the second differential operational amplifier OP2 are electrically connected to the two ends of the second resistor R12 respectively;

The second differential operational amplifier OP2 is used to determine a second voltage difference across the second resistor R12 and provide the second voltage difference to the processor 110 . The processor 110 is used to determine a second current I_SPKN according to the second voltage difference and the second resistor R12 .

It should be understood that the second voltage difference across the second resistor R12 determined by the second differential operational amplifier OP2 is the voltage divider of the second resistor R12. The ratio of the second voltage difference to the second resistor R12 calculated according to Ohm's law is the current value passing through the second resistor R12, that is, the second current I_SPKN transmitted between the negative port of the speaker 200 and the audio negative differential output terminal SPKN.

It should be understood that, similar to the first current acquisition circuit 210 of Figure 12, the second current acquisition circuit 220 may also include other devices and form a second operational amplifier circuit with the second differential operational amplifier OP2. The structure of the second operational amplifier circuit may be the same as or different from the first operational amplifier circuit 211 in Figure 12. If they are the same, the calculation principles of the two are the same and will not be repeated here.

13 , the specific process of the detection circuit 20 performing fault detection when the speaker 200 in FIG. 11 is short-circuited to the ground or the power supply fails will be described below.

FIG13(a) shows an equivalent structural schematic diagram of the speaker 200 in FIG11 having a speaker short-circuited to ground fault. As shown in FIG13(a), if the negative terminal of the speaker 200 is short-circuited to the ground, it is equivalent to connecting the negative terminal of the speaker 200 to the ground terminal GND. The loss between the negative terminal and the ground terminal GND is equivalent to the first equivalent resistance RS1, and the current between the negative terminal and the ground terminal GND is recorded as I_S1.

In conjunction with (a) in FIG. 13 , the first current I_SPKP transmitted between the audio positive differential output terminal SPKP and the positive port of the speaker 200 is divided into two paths after passing through the speaker 200, one path being the second current I_SPKN transmitted between the negative port of the speaker 200 and the audio negative differential output terminal SPKN, and the other path being the current I_S1 transmitted between the negative port and the ground terminal GND, thereby obtaining the following formula (10);

I_SPKP＝I_RL＝I_SPKN+I_S1 (10)

According to formula (10), when the negative terminal of the speaker 200 is short-circuited to the ground, the magnitude of the first current I_SPKP will be greater than the second current I_SPKN. It should be understood that when the positive terminal of the speaker 200 is short-circuited to the ground, the equivalent structural schematic diagram of the circuit is similar to the schematic diagram of the negative terminal of the speaker being short-circuited to the ground, and the magnitude of the first current I_SPKP is still greater than the second current I_SPKN, which will not be repeated here.

Based on this, during subsequent detection, if it is determined that the first current I_SPKP is greater than the second current I_SPKN, it indicates that a fault of the speaker being short-circuited to the ground has occurred.

FIG13(b) shows an equivalent structural schematic diagram of the speaker in FIG11 when a speaker short-circuit to power supply fault occurs. As shown in FIG13(b), if the positive terminal of the speaker circuit 10 is short-circuited to the power supply BAT, it is equivalent to connecting the positive terminal of the speaker 200 to a high level. The loss between the power supply BAT and the positive terminal is equivalent to the second equivalent resistor RS2, and the current between the power supply BAT and the positive terminal is recorded as I_S2.

Combined with (b) in FIG. 13 , the first current I_SPKP is combined with I_S2 before passing through the speaker 200 , and then transmitted back to the audio negative differential output terminal SPKN after passing through the speaker 200 , thereby obtaining the following formula (11);

I_SPKP+I_S2＝I_RL＝I_SPKN Formula (11)

According to formula (11), when the positive terminal of the speaker 200 is short-circuited to the power supply, the magnitude of the first current I_SPKP will be smaller than the second current I_SPKN. It should be understood that when the negative terminal of the speaker 200 is short-circuited to the power supply, the equivalent structural schematic diagram of the circuit is similar to the schematic diagram of the negative terminal of the speaker 200 being short-circuited to the ground, and the magnitude of the first current I_SPKP is still smaller than the second current I_SPKN, which will not be described in detail.

Based on this, during subsequent detection, if it is determined that the first current I_SPKP is smaller than the second current I_SPKN, it indicates that a fault occurs in the speaker circuit 10 where the speaker is short-circuited to the power supply.

Optionally, in the embodiment of the present application, as shown in FIG. 11 , the current comparison circuit 230 in the detection circuit 20 includes: a third differential operational amplifier OP3 .

Two input terminals of the third differential operational amplifier OP3 are electrically connected to the output terminal of the first differential operational amplifier OP1 and the output terminal of the second differential operational amplifier OP2 respectively.

The third differential operational amplifier OP3 is used to determine a third voltage difference between the first voltage difference and the second voltage difference and provide the third voltage difference to the processor 110. The processor 110 is used to determine a current difference according to the third voltage difference, the first resistor R11 or the second resistor R12.

It should be understood that the third voltage difference determined by the third differential operational amplifier OP3 is the difference between the divided voltage of the first resistor R11 and the divided voltage of the second resistor R12. When the third voltage difference is a positive value, it means that the divided voltage of the first resistor R11 is greater than the divided voltage of the second resistor R12. Since the first resistor R11 is equal to the second resistor R12, the processor 110 calculates the ratio of the third voltage difference to the first resistor R11 (or the second resistor R12) according to Ohm's law to obtain the current difference, and the current difference should be a positive value.

The current difference can be calculated according to the following formula (12):

Wherein, △I represents the current difference, △V1 represents the first voltage difference, △V2 represents the second voltage difference, and △V3 represents the third voltage difference. Based on this, in subsequent detection, if the processor 110 determines that the current difference △I is a positive value according to the third voltage difference △V3, it means that the speaker is short-circuited to the ground.

Similarly, when the third voltage difference is a negative value, it means that the voltage division of the first resistor R11 is less than the voltage division of the second resistor R12. Since the first resistor R11 is equal to the second resistor R12, the processor 110 calculates the ratio of the third voltage difference △V3 to the first resistor R11 (or the second resistor R12) according to Ohm's law to obtain the current difference △I, and the current difference △I is a negative value. Based on this, during subsequent detection, if the processor 110 determines that the current difference △I is a negative value according to the third voltage difference △V3, it means that a fault of the speaker short-circuiting to the power supply has occurred.

When the third voltage difference △V3 is zero, it means that the divided voltage of the first resistor R11 is equal to the divided voltage of the second resistor R12. At this time, the corresponding current difference △I should be zero. Based on this, during subsequent detection, if the processor 110 determines that the current difference △I is zero based on the third voltage difference △V3, it means that the first fault has not occurred.

It should be understood that, similar to the first current acquisition circuit 210 of Figure 12, the current comparison circuit 230 may also include other devices and form a third operational amplifier circuit with the third differential operational amplifier OP3. The structure of the third operational amplifier circuit may be the same as or different from the structure of the first operational amplifier circuit 211 of Figure 12. If they are the same, the calculation principles of the two are the same and will not be repeated here.

Optionally, in the embodiment of the present application, as shown in FIG. 11 , the voltage acquisition circuit 240 may include: a fourth differential operational amplifier OP4, wherein two input terminals of the fourth differential operational amplifier OP4 are electrically connected to the positive electrode port and the negative electrode port of the speaker 200, respectively;

The fourth differential operational amplifier OP4 is used to determine a fourth voltage difference between the positive terminal and the negative terminal of the speaker 200 and provide the fourth voltage difference to the processor 110 .

It should be understood that in the embodiment of the present application, similar to the first current acquisition circuit 210 shown in Figure 12, the voltage acquisition circuit 240 may also include other devices and form a fourth operational amplifier circuit with the fourth differential operational amplifier OP4. The structure of the fourth operational amplifier circuit may be the same as or different from the structure of the first operational amplifier circuit 211 in Figure 12. If they are the same, the calculation principles of the two are basically the same and will not be repeated here.

Optionally, Fig. 14 shows a schematic diagram of the structure of another detection system 2 provided in an embodiment of the present application. As shown in Fig. 14, the bias circuit 250 in the detection circuit 20 includes: a bias voltage terminal VCC, a first bias resistor RT1, a second bias resistor RT2 and a ground terminal GND.

The first end of the first bias resistor RT1 is electrically connected to the bias voltage terminal VCC, the second end of the first bias resistor RT1 is electrically connected to the audio positive differential output terminal SPKP, the first end of the second bias resistor RT2 is electrically connected to the audio negative differential output terminal SPKN, and the second end of the second bias resistor RT2 is electrically connected to the ground terminal GND.

Optionally, in an embodiment of the present application, as shown in Figure 14, a first switch SW1 can be connected in series between the second end of the first bias resistor RT1 and the audio positive differential output terminal SPKP, and a second switch SW2 can be connected in series between the first end of the second bias resistor RT2 and the audio negative differential output terminal SPKN.

When a fault needs to be detected, the first switch SW1 and the second switch SW2 can be controlled to be closed simultaneously to conduct the circuit loop from the bias voltage terminal VCC through the speaker 200 to the ground terminal GND, so that the speaker circuit 10 can be detected when the audio module 120 is not working.

It should be understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the detection circuit 20. In other embodiments of the present application, the detection circuit 20 may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

The detection system provided by the present application collects the first current transmitted between the audio positive differential output terminal of the audio power amplifier and the positive port of the speaker, and the second current transmitted between the audio negative differential output terminal and the negative port of the speaker through the detection circuit in the detection system, and then, the processor compares the magnitude of the first current and the second current to determine whether the speaker has a short circuit to the ground or a short circuit to the power supply, and then combines the voltage difference at both ends of the speaker to detect whether the speaker circuit has an open circuit or a short circuit between speaker lines. Because, when the audio module is working, the DC signal and AC signal output by the audio power amplifier will not interfere with the collection of current and voltage, so that the circuit can achieve the purpose of fault detection of the speaker circuit when the audio module is working.

In addition, sub-audio signals and bias circuits are added to detect whether the speaker is faulty when there is no sound or the audio module is not working, so as to increase the comprehensiveness of the detection.

The embodiment of the present application also provides an electronic device, including a detection system and a speaker connected to each other, wherein the detection system is the detection system provided in the embodiment of the present application.

For example, the electronic device may be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an augmented reality (AR)/virtual reality (VR) device, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc. The embodiments of the present application do not impose any restrictions on the specific type of the electronic device.

The embodiment of the present application also provides a T-BOX, including the detection system provided in the embodiment of the present application.

Optionally, the T-BOX further includes a speaker connected to the detection system.

An embodiment of the present application also provides a vehicle, which includes the T-BOX provided in the embodiment of the present application.

The embodiment of the present application also provides a vehicle, comprising a T-BOX and a detection system connected to each other, wherein the detection system is the detection system provided in the embodiment of the present application described above.

Optionally, the vehicle also includes a horn connected to the detection system.

It should be understood that for vehicle-mounted equipment, an external interface is generally provided, which is electrically connected to the T-BOX. The car manufacturer requires that the external interface can realize fault diagnosis and report the fault in time when it occurs. Therefore, in the embodiment of the present application, after the detection system determines whether the speaker has a fault, the detection result can be reported through the external interface electrically connected to the T-BOX.

It should be understood that the above is only to help those skilled in the art to better understand the embodiments of the present application, rather than to limit the scope of the embodiments of the present application. According to the above examples given, those skilled in the art can obviously make various equivalent modifications or changes. For example, some steps in each embodiment of the above detection method may be unnecessary, or some steps may be newly added. Or a combination of any two or any multiple embodiments of the above. Such modifications, changes or combined solutions also fall within the scope of the embodiments of the present application.

It should also be understood that the above description of the embodiments of the present application focuses on emphasizing the differences between the various embodiments. The same or similar points that are not mentioned can be referenced to each other. For the sake of brevity, they will not be repeated here.

It should also be understood that the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

It should also be understood that in the embodiments of the present application, "pre-setting" and "pre-definition" can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a terminal device), and the present application does not limit its specific implementation method.

It should also be understood that the division of the methods, situations, categories and embodiments in the embodiments of the present application is only for the convenience of description and should not constitute a special limitation. The features of various methods, categories, situations and embodiments can be combined without contradiction.

It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (18)

1. A detection system, wherein the detection system is coupled to a horn, the detection system comprising: the device comprises a processor and an audio module which are connected, and a detection circuit which is connected with the processor and the audio module;

The audio module comprises an audio power amplifier with an audio positive differential output end and an audio negative differential output end, the loudspeaker is provided with a positive electrode port and a negative electrode port, the audio positive differential output end is connected with the positive electrode port, and the audio negative differential output end is connected with the negative electrode port;

The detection circuit comprises a first current acquisition circuit connected in series between the audio positive differential output end and the positive electrode port, a second current acquisition circuit connected in series between the audio negative differential output end and the negative electrode port, a voltage acquisition circuit connected with the positive electrode port and the negative electrode port of the loudspeaker and a bias circuit, wherein the bias circuit is respectively connected with the audio positive differential output end and the audio negative differential output end;

when the audio module does not work, the bias circuit is used for applying bias voltage to a circuit loop where the first current acquisition circuit, the loudspeaker and the second current acquisition circuit are located, the first current acquisition circuit is used for acquiring first current transmitted between the audio positive differential output end and the positive electrode port, the second current acquisition circuit is used for acquiring second current transmitted between the negative electrode port and the audio negative differential output end, and the voltage acquisition circuit is used for acquiring voltage difference between the positive electrode port and the negative electrode port;

the detection circuit is further configured to provide first information to the processor, the first information including the first current, the second current, and the voltage difference;

The processor is used for determining whether the loudspeaker has a first fault according to the first current, the second current and the voltage difference value when the bias voltage is applied.

2. The detection system of claim 1, wherein the detection circuit further comprises: the current comparison circuit is provided with three connecting ports, and the three connecting ports of the current comparison circuit are respectively connected with the first current acquisition circuit, the second current acquisition circuit and the processor;

The current comparison circuit is used for determining a current difference value between the first current and the second current;

accordingly, the first information includes the current difference value.

3. The detection system according to claim 1 or 2, wherein the processor is further configured to generate a sub-audio signal and provide the sub-audio signal to the horn via the audio module, the sub-audio signal having a frequency different from a frequency of the audio signal.

4. The detection system of claim 2, wherein the first current acquisition circuit comprises: a first resistor and a first differential operational amplifier;

the first resistor is connected in series between the audio positive differential output end and the positive electrode port, and two input ends of the first differential operational amplifier are respectively connected with two ends of the first resistor;

The first differential operational amplifier is used for determining a first voltage difference value between two ends of the first resistor and providing the first voltage difference value to the processor, and the processor is used for determining the first current according to the first voltage difference value and the first resistor.

5. The detection system of claim 4, wherein the second current acquisition circuit comprises: a second resistor and a second differential operational amplifier, the second resistor being equal to the first resistor;

The second resistor is connected in series between the audio negative differential output end and the negative electrode port, and two input ends of the second differential operational amplifier are respectively connected with two ends of the second resistor;

the second differential operational amplifier is used for determining a second voltage difference value between two ends of the second resistor and providing the second voltage difference value to the processor, and the processor is used for determining the second current according to the second voltage difference value and the second resistor.

6. The detection system of claim 5, wherein the current comparison circuit comprises: a third differential operational amplifier;

Two input ends of the third differential operational amplifier are respectively connected with the output end of the first differential operational amplifier and the output end of the second differential operational amplifier;

the third differential operational amplifier is configured to determine a third voltage difference between the first voltage difference and the second voltage difference and provide the third voltage difference to the processor, and the processor is configured to determine the current difference based on the third voltage difference, the first resistor, or the second resistor.

7. The detection system of claim 1, wherein the first current acquisition circuit comprises: a first resistor and a first differential operational amplifier;

the first resistor is connected in series between the audio positive differential output end and the positive electrode port, and two input ends of the first differential operational amplifier are respectively connected with two ends of the first resistor;

The first differential operational amplifier is used for determining a first voltage difference value between two ends of the first resistor and providing the first voltage difference value to the processor, and the processor is used for determining the first current according to the first voltage difference value and the first resistor.

8. The detection system of claim 3, wherein the first current acquisition circuit comprises: a first resistor and a first differential operational amplifier;

the first resistor is connected in series between the audio positive differential output end and the positive electrode port, and two input ends of the first differential operational amplifier are respectively connected with two ends of the first resistor;

The first differential operational amplifier is used for determining a first voltage difference value between two ends of the first resistor and providing the first voltage difference value to the processor, and the processor is used for determining the first current according to the first voltage difference value and the first resistor.

9. The detection system according to claim 7 or 8, wherein the second current acquisition circuit comprises: a second resistor and a second differential operational amplifier, the second resistor being equal to the first resistor;

The second resistor is connected in series between the audio negative differential output end and the negative electrode port, and two input ends of the second differential operational amplifier are respectively connected with two ends of the second resistor;

the second differential operational amplifier is used for determining a second voltage difference value between two ends of the second resistor and providing the second voltage difference value to the processor, and the processor is used for determining the second current according to the second voltage difference value and the second resistor.

10. The detection system of claim 1, wherein the voltage acquisition circuit comprises: the two input ends of the fourth differential operational amplifier are respectively connected with the positive electrode port and the negative electrode port of the loudspeaker;

The fourth differential operational amplifier is configured to determine a fourth voltage difference between the positive port and the negative port of the horn and provide the fourth voltage difference to the processor.

11. The detection system of claim 1, wherein the biasing circuit comprises: the bias voltage end, the first bias resistor, the second bias resistor and the grounding end;

The first end of the first bias resistor is connected with the bias voltage end, the second end of the first bias resistor is connected with the audio positive differential output end, the first end of the second bias resistor is connected with the audio negative differential output end, and the second end of the second bias resistor is connected with the ground end.

12. The detection system of claim 1, wherein the first fault comprises a horn short to power, a horn short to ground, a horn open, or a horn-to-horn short.

13. An electronic device comprising a detection system and a horn connected, wherein the detection system is a detection system according to any one of claims 1-12.

14. A T-BOX comprising the detection system of any one of claims 1-12.

15. The T-BOX of claim 14, further comprising a horn coupled to the detection system.

16. A vehicle comprising a T-BOX according to claim 14 or 15.

17. A vehicle comprising a T-BOX and a detection system connected, wherein the detection system is a detection system according to any one of claims 1-12.

18. The vehicle of claim 17, further comprising a horn coupled to the detection system.