CN119527198A - Audio equipment for high voltage automotive systems - Google Patents
Audio equipment for high voltage automotive systems Download PDFInfo
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- CN119527198A CN119527198A CN202411767444.8A CN202411767444A CN119527198A CN 119527198 A CN119527198 A CN 119527198A CN 202411767444 A CN202411767444 A CN 202411767444A CN 119527198 A CN119527198 A CN 119527198A
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Abstract
本发明公开了一种适于高电压车载系统的音响设备。该音响设备包括车载发声装置、唤醒电路和用于为车载发声装置供电的电源电路；唤醒电路包括唤醒信号输入端子、电压判断模块及唤醒信号输出端子；电压判断模块通过所述唤醒信号输入端子接入来自所述高电压车载系统的唤醒信号；所述电压判断模块包括三极管和稳压二极管D3，所述三极管的发射极和所述唤醒信号输入端子连接，所述三极管的基极和所述稳压二极管D3连接，所述三极管的集电极连接至所述唤醒信号输出端子；所述唤醒信号输出端子和所述电源电路连接。本发明不需要使用带唤醒功能的CAN芯片，以低成本方式实现24V等高电压车载系统(例如卡车系统)的音响设备唤醒，特别是实现行人警示器的唤醒。
The present invention discloses an audio device suitable for a high-voltage vehicle-mounted system. The audio device includes a vehicle-mounted sound device, a wake-up circuit and a power supply circuit for powering the vehicle-mounted sound device; the wake-up circuit includes a wake-up signal input terminal, a voltage judgment module and a wake-up signal output terminal; the voltage judgment module accesses the wake-up signal from the high-voltage vehicle-mounted system through the wake-up signal input terminal; the voltage judgment module includes a transistor and a voltage regulator diode D3, the emitter of the transistor is connected to the wake-up signal input terminal, the base of the transistor is connected to the voltage regulator diode D3, and the collector of the transistor is connected to the wake-up signal output terminal; the wake-up signal output terminal is connected to the power supply circuit. The present invention does not need to use a CAN chip with a wake-up function, and realizes the wake-up of the audio device of a high-voltage vehicle-mounted system such as 24V (such as a truck system) in a low-cost manner, especially realizing the wake-up of a pedestrian warning device.
Description
Technical Field
The invention belongs to the field of vehicle-mounted audio equipment, relates to audio equipment of a high-voltage vehicle-mounted system, and particularly relates to audio equipment of a 24V vehicle-mounted system, such as a vehicle pedestrian warning device of a large-scale transportation vehicle such as a truck.
Background
With the continuous development of new energy automobiles, some large-sized transportation vehicles such as trucks and the like also start to enter a new energy driving mode, and a battery replaces a traditional internal combustion engine to provide driving force for the vehicles. Unlike an internal combustion engine, an engine of an electric vehicle emits little mechanical sound. This means that at low speeds the new energy vehicle is almost silent, which makes it difficult for pedestrians, especially visually impaired pedestrians, to detect when the new energy vehicle approaches. Therefore, according to the requirements of safety regulations, a vehicle pedestrian alarm (AVAS) is also required to be provided on a truck adopting a new energy driving mode, so as to remind pedestrians of the existence of vehicles, especially during the low-speed running process of the vehicles.
The power supply voltage of the vehicle-mounted system of the truck is high, the system is mainly 24V, and the driving and controlling module of the pedestrian warning device of the conventional small-sized vehicle (such as a passenger car) cannot be directly applied to the 24V vehicle-mounted system. Vehicle-mounted sound equipment such as AVAS of a small vehicle generally adopts a CAN chip with a wake-up function to realize system wake-up, but the working voltage of the CAN chip with the wake-up function is 12V, 24V voltage cannot be directly compatible, and the CAN chip with the wake-up function has higher cost.
The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In view of the above, the present invention provides an audio device suitable for a high-voltage vehicle-mounted system, which does not need to use a CAN chip with a wake-up function, and which realizes wake-up of the audio device of a high-voltage vehicle-mounted system (e.g., a truck system) such as 24V, and particularly, wake-up of a pedestrian alarm, in a low-cost manner.
The invention adopts the following technical scheme:
The sound equipment suitable for the high-voltage vehicle-mounted system comprises a vehicle-mounted sound generating device, a wake-up circuit and a power supply circuit for supplying power to the vehicle-mounted sound generating device, wherein the wake-up circuit comprises a wake-up signal input terminal, a voltage judging module and a wake-up signal output terminal;
The voltage judging module comprises a triode and a voltage stabilizing diode D3, wherein an emitter of the triode is connected with the wake-up signal input terminal, a base of the triode is connected with the voltage stabilizing diode D3, and a collector of the triode is connected to the wake-up signal output terminal;
The wake-up signal output terminal is connected with the power supply circuit.
In a preferred embodiment, the emitter of the triode is connected with a resistor R3, the base of the triode is connected with the first end of the zener diode D3 through a resistor R4, the second end of the zener diode D3 is grounded, the voltage judging module further comprises a capacitor C4, the first end of the capacitor C4 is connected with the resistor R3, the second end of the capacitor C4 is grounded, and the connection point of the resistor D3 and the capacitor C4 is connected with the connection point of the resistor R4 and the first end of the zener diode through a wire.
In a preferred embodiment, the wake-up circuit further includes an anti-reflection module and a voltage division filtering module, where the anti-reflection module, the voltage division filtering module and the voltage judging module are sequentially set.
In a more preferred embodiment, the anti-back module includes an anti-back diode D1 connected between the wake-up signal input terminal and the emitter of the transistor.
In a further preferred embodiment, the voltage division filtering module includes a resistor R1, a resistor R2, and a capacitor, where the resistor R1 is connected in series between the anti-reflection diode D1 and the emitter of the triode, a first end of the resistor R2 is connected to a connection point between the resistor R1 and the emitter of the triode, a second end of the resistor R2 is grounded, and the capacitor and the resistor R2 are connected in parallel.
In a further preferred embodiment, the voltage division filtering module further includes an inductor FB1, and the inductor FB1 is connected in series between the resistor R1 and the emitter of the triode;
The voltage division filtering module further comprises a transient voltage suppression diode D2, a first end of the transient voltage suppression diode D2 is connected to a connection point of the inductor FB1 and the emitter of the triode, and a second end of the transient voltage suppression diode D2 is grounded;
The capacitor comprises a capacitor C1, a capacitor C2 and a capacitor C3, wherein a first end of the capacitor C1 is connected to a connection point of the wake-up signal input terminal and the anti-reflection diode D1, a first end of the capacitor C2 is connected to a connection point of the resistor R1 and the inductor FB1, a first end of the capacitor C3 is connected to a connection point of the inductor FB1 and an emitter of the triode, and the capacitor C1, the capacitor C2, the resistor R2, the transient voltage suppression diode D2 and the capacitor C3 are sequentially arranged, and a second end of the capacitor C1, the capacitor C2 and the capacitor C3 is grounded.
In a preferred embodiment, the wake-up circuit further includes a voltage protection module, and a collector of the triode is connected to the wake-up signal output terminal through the voltage protection module;
The voltage protection module comprises a voltage stabilizing diode D4, a first end of the voltage stabilizing diode D4 is connected to a connection point of a collector electrode of the triode and the wake-up signal output terminal, and a second end of the voltage stabilizing diode D4 is grounded.
In a more preferred embodiment, the voltage protection module further includes a resistor R5, a resistor R6, and a capacitor C5, where a collector of the triode is connected to the wake-up signal output terminal through the resistor R5, a first end of the resistor R6 is connected to a connection point between the resistor R5 and the wake-up signal output terminal, a second end of the resistor R6 is grounded, and the capacitor C5 is connected to the resistor R6 in parallel;
The voltage protection module further comprises a capacitor C6, a first end of the capacitor C6 is connected to the wake-up signal output terminal, and a second end of the capacitor C6 is grounded.
In a preferred embodiment, the vehicle-mounted system is a 24V vehicle-mounted system, the wake-up signal output terminal outputs a high-level signal when the level of the signal connected to the wake-up signal input terminal is higher than a set value, and the wake-up signal output terminal outputs a low-level signal when the level of the signal connected to the wake-up signal input terminal is lower than the set value.
In a preferred embodiment, the power supply circuit comprises a power supply chip, and the wake-up signal output terminal is connected to a wake pin of the power supply chip.
In a preferred embodiment, the on-vehicle sound generating device comprises a pedestrian warning indicator installed on a truck, the on-vehicle system is the on-vehicle system of the truck, and the power chip supplies power for the power amplifier of the pedestrian warning indicator.
The invention adopts the scheme and has the following advantages:
The invention provides sound equipment, which is characterized in that a wake-up circuit is arranged between a vehicle-mounted system and a power supply circuit of a vehicle-mounted sound generating device, a voltage judging module of the wake-up circuit is used for judging whether the level of a signal connected with a wake-up signal input terminal meets a set wake-up condition, when the level meets the set wake-up condition, a high-level wake-up signal is output through a wake-up signal output terminal, the power supply circuit is waken to supply power for the vehicle-mounted sound generating device, the high-voltage vehicle-mounted system with more than 24V CAN be compatible, and the sound equipment is suitable for large-scale transportation vehicles such as trucks with higher vehicle-mounted system voltages, CAN be used for waking up sound equipment such as pedestrian alarms of the large-scale transportation vehicles, entertainment or speakers for remote communication, CAN chips with wake-up functions are not needed, and the wake-up of the vehicle-mounted sound equipment is realized at lower cost.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of an audio apparatus according to an embodiment of the present invention.
Fig. 2 is a block diagram of a wake-up circuit according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a wake-up circuit according to an embodiment of the invention.
Fig. 4 is a wake-up flow chart of an audio device according to an embodiment of the present invention.
In the above figures of the drawings,
1. A vehicle-mounted system; 11, ECU, 2, wake-up circuit, 3, power supply circuit, 4, power amplifier, 5, loudspeaker;
21. A wake-up signal input terminal; 22, an anti-reverse module, 23, a voltage division filtering module, 24, a voltage judging module, 25, a voltage protecting module and 26, a wake-up signal output terminal.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The following embodiments relate to an acoustic device suitable for a high-voltage in-vehicle system, and in particular, to an acoustic device wake-up circuit suitable for a high-voltage in-vehicle system. The high voltage vehicle system operates at a voltage of 24V or more, typically 24V vehicle systems, and in other embodiments may be 48V vehicle systems. These on-board systems are on-board systems for large transportation vehicles such as new energy trucks that are powered by batteries.
Referring to fig. 1, the acoustic apparatus includes an in-vehicle sound emitting device, a wake-up circuit 2, and a power supply circuit 3 for supplying power to the in-vehicle sound emitting device. The "vehicle-mounted sound generating device" means a device mounted on a vehicle and capable of realizing electroacoustic conversion, and capable of playing sound inside or outside the vehicle. In this embodiment, the audio device is typically a pedestrian alert (AVAS) of a new energy truck, which is mounted on the truck and emits an alert sound to the outside of the vehicle to alert pedestrians of the presence of the vehicle. The pedestrian alert comprises a speaker 5 capable of achieving electroacoustic conversion. In other embodiments, the audio device may be an in-vehicle audio system that projects sound into the vehicle for entertainment or remote call functions, etc., and the in-vehicle audio system may include door panel speakers, headrest speakers, ceiling speakers, etc., with sound frequencies ranging from bass to treble. The power circuit 3 may comprise a power supply chip, such as an LDO or DCDC chip. The power supply circuit 3 is electrically connected with the power amplifier 4 and can supply power for the power amplifier 4. The power amplifier 4 is electrically connected with the loudspeaker 5, and the loudspeaker 5 is driven to sound through the power amplifier 4.
As shown in fig. 2 and 3, the wake-up circuit 2 includes a wake-up signal input terminal 21, a voltage determination module 24, and a wake-up signal output terminal 26. The voltage determination module 24 accesses a wake-up signal from the high-voltage in-vehicle system 1 through the wake-up signal input terminal 21. In the present embodiment, the wake-up signal input terminal 21 is connected to a vehicle system of a truck, and for example, the wake-up signal input terminal 21 is electrically connected to the electronic controller ECU 11 of the truck. The wake-up signal output terminal 26 is connected to the power circuit 3 of the on-board sound generating unit, in particular to the wake pin of the power chip. The voltage judging module 24 includes a transistor Q1 and a zener diode D3, the emitter of the transistor Q1 is connected to the wake-up signal input terminal 21, the base of the transistor Q1 is connected to the zener diode D3, and the collector of the transistor Q1 is connected to the wake-up signal output terminal 26. The in-vehicle system 1 is a 24V in-vehicle system, and when the level of the signal to which the wake-up signal input terminal 21 is connected is higher than the set value, the wake-up signal output terminal 26 outputs a high-level signal, and when the level of the signal to which the wake-up signal input terminal 21 is connected is lower than the set value, the wake-up signal output terminal 26 outputs a low-level signal.
An emitter of the triode Q1 is connected with a resistor R3, a base of the triode Q1 is connected with a first end of a zener diode D3 through a resistor R4, and a second end of the zener diode D3 is grounded. The voltage judging module 24 further includes a capacitor C4, a first end of the capacitor C4 is connected to the resistor R3, a second end of the capacitor C4 is grounded, and a connection point between the resistor D3 and the capacitor C4 is connected to a connection point between the resistor R4 and the first end of the zener diode through a wire. In this embodiment, the triode Q1 is a PNP triode, the zener diode D3 is used as a clamp tube, and the PNP tube and the clamp tube are combined to realize that a lower voltage (for example, 4V voltage) is turned off for waking up, a higher voltage (for example, 7V voltage) is turned on for waking up, and finally, the voltage division and the clamp tube output voltage are used to control the back-end system. Resistor R3 and resistor R4 are used to drive transistor Q1, and capacitor C4 is used to filter to prevent pulse spikes.
The wake-up circuit 2 further comprises an anti-reflection module 22 and a voltage division filtering module 23, wherein the anti-reflection module 22, the voltage division filtering module 23 and the voltage judging module 24 are sequentially arranged. The anti-reflection module 22 includes an anti-reflection diode D1 connected between the wake-up signal input terminal 21 and the emitter of the transistor Q1. The reverse voltage is prevented by the anti-reverse diode, and the circuit is protected. The voltage division filtering module 23 comprises a resistor R1, a resistor R2 and a capacitor, wherein the resistor R1 is connected in series between the anti-reflection diode D1 and the emitter of the triode Q1, the first end of the resistor R2 is connected to the connection point of the resistor R1 and the emitter of the triode Q1, the second end of the resistor R2 is grounded, and the capacitor and the resistor R2 are connected in parallel.
The voltage division filtering module 23 further includes an inductor FB1, where the inductor FB1 is connected in series between the resistor R1 and the emitter of the transistor Q1. The voltage division filtering module 23 further includes a transient voltage suppression diode D2, where a first end of the transient voltage suppression diode D2 is connected to a connection point between the inductor FB1 and the emitter of the triode Q1, and a second end of the transient voltage suppression diode D2 is grounded. The electric capacity includes electric capacity C1, electric capacity C2 and electric capacity C3, and electric capacity C1's first end is connected in wake-up signal input terminal 21 and prevents the tie point of anti-diode D1, and electric capacity C2's first end is connected in resistance R1 and inductance FB 1's tie point, and electric capacity C3's first end is connected in inductance FB1 and triode Q1's projecting pole's tie point, and electric capacity C1, electric capacity C2, resistance R2, transient voltage suppression diode D2 and electric capacity C3 set gradually, and electric capacity C1, electric capacity C2 and electric capacity C3's second end ground connection. The resistor R1, the resistor R2 and the capacitor C1 form a voltage division filter circuit. The transient voltage suppressing diode D2 is used to suppress transient voltages and protect the following circuits. The inductor FB1, the capacitor C2 and the capacitor C3 play a pi-type filtering role.
The wake-up circuit 2 further comprises a voltage protection module 25, and the collector of the triode Q1 is connected to the wake-up signal output terminal 26 through the voltage protection module 25. The voltage protection module 25 includes a zener diode D4, a first end of the zener diode D4 is connected to a connection point between the collector of the triode Q1 and the wake-up signal output terminal 26, and a second end of the zener diode D4 is grounded. The zener diode D4 plays a role of clamping, and can be clamped to a fixed voltage at maximum.
The voltage protection module 25 further includes a resistor R5, a resistor R6, and a capacitor C5, where a collector of the triode Q1 is connected to the wake-up signal output terminal 26 through the resistor R5, a first end of the resistor R6 is connected to a connection point of the resistor R5 and the wake-up signal output terminal 26, a second end of the resistor R6 is grounded, and the capacitor C5 is connected in parallel to the resistor R6. The resistor R5 and the resistor R6 play a role in voltage division, and the capacitor C5 plays a role in filtering and energy storage. The voltage protection module 25 further includes a capacitor C6, a first end of the capacitor C6 is connected to the wake-up signal output terminal 26, a second end of the capacitor C6 is grounded, and the capacitor C6 performs a filtering process.
As shown in fig. 3, the wake-up signal input terminal 21, the anti-reflection diode D1, the resistor R1, the inductor FB1, and the emitter of the transistor Q1 are sequentially connected in series, and the collector of the transistor Q1, the resistor R5, and the wake-up signal output terminal 26 are sequentially connected in series. The capacitor C1 is connected between the wake-up signal input terminal 21 and ground. One end of the resistor R2 is connected with a connection point of the resistor R1 and the inductor FB1, the other end of the resistor R2 is grounded, and the capacitor C2 is connected in parallel with two sides of the resistor R2. One end of the diode D2 is connected to a connection point of the inductor FB1 and the emitter of the triode Q1, the other end of the diode D2 is grounded, and the capacitor C3 is connected to two sides of the diode D2 in parallel and is positioned between the diode D2 and the emitter of the triode Q1. The resistor R3 and the capacitor C4 are connected in series to form a first grounded branch, the resistor R4 and the diode D3 are connected in series to form a second grounded branch, and the first branch and the second branch are both positioned at the rear side of the capacitor C3. The intermediate point of the first branch (the junction of resistor R3 and capacitor C4) is connected to the intermediate point of the second branch (the junction of resistor R4 and diode D3) by a wire. A capacitor C5 is connected between the collector of transistor Q1 and ground. The resistor R5, the resistor R6, the diode D4 and the capacitor C6 are sequentially located at the rear side of the capacitor C5.
In this embodiment, the power supply voltage of the truck system is higher, mainly 24V system, and in order to ensure the stability of the electrical performance of the truck system, the wake-up control voltage of the audio equipment is required to be lower than 4V, the electronic components are turned off, more than or equal to 7V, the electronic components must be turned on, and a control buffer zone is provided between 4V and 7V.
The external input of wake-up signal, the wake-up signal input through anti-reverse module 22 to prevent reverse voltage and protect circuit, the voltage-dividing filter module 23 to provide stable voltage for the back end and eliminate interference signal, the voltage judging module 24 composed of PNP tube and voltage-stabilizing diode to realize wake-up at lower than 4V and wake-up at higher than 7V through voltage screening, and the voltage-dividing protection of output signal level through the resistor of the voltage protecting module 25. Typically, when a large transportation vehicle such as a truck is started, such as by using a key to start or a push-to-start the vehicle, the vehicle will send a wake-up signal to the AVAS to initiate the AVAS function.
Specifically, as shown in fig. 3, the voltage is applied to the reverse voltage of the protection circuit by the anti-reflection diode D1 from the wake-up signal input, the voltage is divided by the resistor R1 and the resistor R2 and the voltage is provided by the filtering circuit, the voltage division ratio is 1:0.8, the voltage is then passed through the voltage judging module 24 and is composed of the PNP transistor Q1 combination and the voltage stabilizing diode D3, when the voltage of the signal input higher than 7V forms the voltage drop through the emitter and the base of the Q1, the voltage stabilizing diode D3 stabilizes the voltage to enable the PNP transistor Q1 to be in a conducting state and output a high-level voltage, when the voltage of the signal input lower than 4V passes through the Q1, the emitter and the base of the PNP transistor cannot form the voltage drop at this time, the Q1 is in a non-conducting state, the voltage is divided and then voltage protected through the voltage stabilizing diode D4, and finally the signal is output.
When the wake-up signal inputs voltage, the voltage is divided to judge whether the divided voltage is larger than 5.2V, if the divided voltage is smaller than 5.2V, the signal outputs low level, if the divided voltage is larger than 5.2V, the signal outputs high level, and then the signal outputs high level after voltage division protection. In the embodiment, the design requirement is that the voltage value between 4 and 7V is designed to be greater than 7V input high level and less than 4V input low level, and the WAKE pin voltage of the following power chip is required to be combined, so that 5.2V is selected as a judgment comparison threshold. In other embodiments, the comparison threshold is not necessarily this value, which is modified by modifying the resistance value according to different design requirements.
According to the acoustic equipment, the wake-up circuit 2 is arranged between the vehicle-mounted system and the power supply circuit 3 of the vehicle-mounted acoustic equipment, the voltage judging module 24 of the wake-up circuit 2 is used for judging whether the level of a signal accessed by the wake-up signal input terminal 21 meets the set wake-up condition, after the set wake-up condition is met, the high-level wake-up signal is output through the wake-up signal output terminal 26, the power supply circuit 3 is waken to supply power for the vehicle-mounted acoustic equipment, the acoustic equipment CAN be compatible with a high-voltage vehicle-mounted system with more than 24V, is suitable for large-scale transport vehicles such as trucks with high vehicle-mounted system voltage, CAN be used for waking up acoustic equipment such as pedestrian alarms of the large-scale transport vehicles, entertainment or speakers for remote communication, CAN chips with wake-up functions are not needed, and the wake-up of the vehicle-mounted acoustic equipment CAN be realized at lower cost.
As used in this specification and in the claims, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.
It is further understood that the term "plurality" in this disclosure means two or more, and other adjectives are similar thereto.
It is further understood that the terms "first," "second," and the like are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the expressions "first", "second", etc. may be used entirely interchangeably. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.
The above-described embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to be preferred embodiments for those skilled in the art to understand the present invention and implement the same according to the present invention, not to limit the scope of the present invention.
Claims (10)
1. The sound equipment suitable for the high-voltage vehicle-mounted system comprises a vehicle-mounted sound generating device, a wake-up circuit and a power supply circuit for supplying power to the vehicle-mounted sound generating device, and is characterized in that the wake-up circuit comprises a wake-up signal input terminal, a voltage judging module and a wake-up signal output terminal, wherein the voltage judging module is connected with a wake-up signal from the high-voltage vehicle-mounted system through the wake-up signal input terminal;
The voltage judging module comprises a triode and a voltage stabilizing diode D3, wherein an emitter of the triode is connected with the wake-up signal input terminal, a base of the triode is connected with the voltage stabilizing diode D3, and a collector of the triode is connected to the wake-up signal output terminal;
The wake-up signal output terminal is connected with the power supply circuit.
2. The audio equipment according to claim 1, wherein an emitter of the triode is connected with a resistor R3, a base of the triode is connected with a first end of the zener diode D3 through a resistor R4, a second end of the zener diode D3 is grounded, the voltage judging module further comprises a capacitor C4, the first end of the capacitor C4 is connected with the resistor R3, the second end of the capacitor C4 is grounded, and a connection point of the resistor D3 and the capacitor C4 is connected with a connection point of the resistor R4 and the first end of the zener diode through a wire.
3. The audio device of claim 1, wherein the wake-up circuit further comprises an anti-reflection module and a voltage division filtering module, the anti-reflection module, the voltage division filtering module, and the voltage determination module being sequentially arranged.
4. An audio device as claimed in claim 3, characterized in that the anti-reflection module comprises an anti-reflection diode D1 connected between the wake-up signal input terminal and the emitter of the transistor.
5. The audio equipment according to claim 4, wherein the voltage division filtering module comprises a resistor R1, a resistor R2 and a capacitor, the resistor R1 is connected in series between the anti-reflection diode D1 and the emitter of the triode, a first end of the resistor R2 is connected to a connection point between the resistor R1 and the emitter of the triode, a second end of the resistor R2 is grounded, and the capacitor and the resistor R2 are connected in parallel.
6. The audio equipment according to claim 5, wherein the voltage division filtering module further comprises an inductor FB1, and the inductor FB1 is connected in series between a resistor R1 and an emitter of the triode;
The voltage division filtering module further comprises a transient voltage suppression diode D2, a first end of the transient voltage suppression diode D2 is connected to a connection point of the inductor FB1 and the emitter of the triode, and a second end of the transient voltage suppression diode D2 is grounded;
The capacitor comprises a capacitor C1, a capacitor C2 and a capacitor C3, wherein a first end of the capacitor C1 is connected to a connection point of the wake-up signal input terminal and the anti-reflection diode D1, a first end of the capacitor C2 is connected to a connection point of the resistor R1 and the inductor FB1, a first end of the capacitor C3 is connected to a connection point of the inductor FB1 and an emitter of the triode, and the capacitor C1, the capacitor C2, the resistor R2, the transient voltage suppression diode D2 and the capacitor C3 are sequentially arranged, and a second end of the capacitor C1, the capacitor C2 and the capacitor C3 is grounded.
7. The acoustic device according to any one of claims 1 to 6, wherein the wake-up circuit further comprises a voltage protection module, and a collector of the triode is connected to the wake-up signal output terminal through the voltage protection module;
The voltage protection module comprises a voltage stabilizing diode D4, a first end of the voltage stabilizing diode D4 is connected to a connection point of a collector electrode of the triode and the wake-up signal output terminal, and a second end of the voltage stabilizing diode D4 is grounded.
8. The audio device of claim 7, wherein the voltage protection module further comprises a resistor R5, a resistor R6, and a capacitor C5, the collector of the triode is connected to the wake-up signal output terminal through the resistor R5, the first end of the resistor R6 is connected to the connection point of the resistor R5 and the wake-up signal output terminal, the second end of the resistor R6 is grounded, and the capacitor C5 is connected in parallel to the resistor R6;
The voltage protection module further comprises a capacitor C6, a first end of the capacitor C6 is connected to the wake-up signal output terminal, and a second end of the capacitor C6 is grounded.
9. The acoustic device according to claim 1, wherein the in-vehicle system is a 24V in-vehicle system, the wake-up signal output terminal outputs a high-level signal when a level of a signal to which the wake-up signal input terminal is connected is higher than a set value, and the wake-up signal output terminal outputs a low-level signal when a level of a signal to which the wake-up signal input terminal is connected is lower than a set value.
10. The sound equipment of claim 1, wherein the power supply circuit comprises a power supply chip, the wake signal output terminal is connected to a wake pin of the power supply chip, the vehicle-mounted sound generating device comprises a pedestrian alarm mounted on a truck, the vehicle-mounted system is a vehicle-mounted system of the truck, and the power supply chip supplies power for a power amplifier of the pedestrian alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411767444.8A CN119527198A (en) | 2024-12-04 | 2024-12-04 | Audio equipment for high voltage automotive systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411767444.8A CN119527198A (en) | 2024-12-04 | 2024-12-04 | Audio equipment for high voltage automotive systems |
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| CN119527198A true CN119527198A (en) | 2025-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411767444.8A Pending CN119527198A (en) | 2024-12-04 | 2024-12-04 | Audio equipment for high voltage automotive systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119527198A (en) |
-
2024
- 2024-12-04 CN CN202411767444.8A patent/CN119527198A/en active Pending
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