CN216387785U - Multi-path camera power supply detection circuit and multi-path camera power supply detection system - Google Patents

Abstract

The utility model provides a multi-path camera power supply detection circuit and a multi-path camera power supply detection system, wherein the multi-path camera power supply detection circuit comprises a control unit and a power supply chip; the power supply chip comprises a plurality of transmission branches, and each transmission branch comprises an input circuit and an output circuit which are connected with each other; the input circuit of each transmission branch is used for accessing an external voltage signal and transmitting the voltage signal to the external camera connected with the input circuit through the output port of the output circuit; the power supply chip also comprises an I2C circuit connected with each transmission branch; the control unit is connected with the I2C circuit; the control unit is used for reading the voltage signal of each transmission branch circuit through the I2C circuit and determining the working state of the power supply chip according to the read voltage signal. The utility model can solve the problem that MCU resources occupy too much when the power supply of the camera is detected at present.

Description

Multi-channel camera power detection circuit and multi-channel camera power detection system

technical field

The utility model relates to the technical field of automotive electronics, in particular to a multi-channel camera power supply detection circuit and a multi-channel camera power supply detection system.

Background technique

In the car navigation system, the camera (such as 360° panoramic camera, high-definition reversing camera, etc.) is a very important device, so it is often necessary to detect the power supply of the camera to ensure the normal operation of the camera. At present, the detection of the power supply of the camera is usually realized by reading the voltage changes of multiple IO ports of the power supply chip of the camera through the vehicle MCU, while the MCU reads the voltage value output by the power supply chip through the AD port. The detection needs to occupy an AD port of the MCU. With the development of autonomous driving technology, more and more cameras are needed on the vehicle, generally 4 to 6 cameras are required. In order to ensure the normal operation of each camera, the power supply of each camera needs to be detected, which requires occupation of The 4 to 6 AD ports of the MCU cause the MCU resource to be occupied too much.

Utility model content

The purpose of the utility model is to provide a multi-channel camera power detection circuit, so as to alleviate the problem that the MCU resources are too large when the current camera power is detected.

In a first aspect, an embodiment of the present invention provides a multi-channel camera power detection circuit, including a control unit and a power chip; the power chip includes a plurality of transmission branches, and each of the transmission branches includes an input connected to each other a circuit and an output circuit; the input circuit of each transmission branch is used to connect an external voltage signal, and transmit the voltage signal to the connected external camera through the output port of the output circuit; the power chip also includes: an I2C circuit connected to each of the transmission branches; the control unit is connected to the I2C circuit; the control unit is used to read the voltage signal of each of the transmission branches through the I2C circuit, according to the reading The obtained voltage signal determines the working state of the power chip.

In conjunction with the first aspect, an embodiment of the present invention provides the first implementation manner of the first aspect, wherein the power chip further includes a register connected to the I2C circuit; the register pre-stores each of the transmission branches The reference voltage corresponding to the circuit; the control unit is further configured to read the reference voltage in the register through the I2C circuit, and judge the power supply chip by comparing the voltage signal of the transmission branch with the reference voltage. working status.

In conjunction with the first aspect, an embodiment of the present invention provides a second implementation manner of the first aspect, wherein the power supply chip further includes a feedback circuit connected to the control unit; the feedback circuit is configured to transmit data according to the transmission The voltage signal of the branch and the reference voltage determine that an alarm signal is sent to the control unit when the power supply chip is abnormal.

In conjunction with the first aspect, an embodiment of the present invention provides a third implementation manner of the first aspect, wherein the power supply chip further includes an activation circuit connected to the I2C circuit; the control unit is used for receiving the After the alarm signal is received, the activation circuit is controlled to send an activation signal to the I2C circuit to activate the I2C circuit.

In combination with the first aspect, the embodiment of the present invention provides a fourth implementation manner of the first aspect, wherein the multi-channel camera power supply detection circuit further includes a power supply unit connected to the power supply chip; the power supply unit is used for A voltage signal is input to the power chip.

In combination with the first aspect, the embodiment of the present utility model provides a fifth implementation manner of the first aspect, wherein the multi-channel camera power supply detection circuit further includes a voltage conversion circuit, and the voltage conversion circuit is respectively connected with the power supply unit, The input circuits of different transmission branches are all connected; the voltage conversion circuit is used to respectively convert the voltage signals output by the power supply unit into voltage signals required by different transmission branches, and convert the converted voltage signals to the voltage signals respectively. Corresponding to the input circuits transmitted to different said transmission branches.

In conjunction with the first aspect, an embodiment of the present invention provides a sixth implementation manner of the first aspect, wherein there are multiple power supply chips; and the reference voltage pre-stored in the register is associated with identification information of the power supply chip.

In conjunction with the first aspect, an embodiment of the present invention provides a seventh implementation manner of the first aspect, wherein the multi-channel camera power supply detection circuit includes at least two of the power supply chips.

In conjunction with the first aspect, an embodiment of the present invention provides an eighth implementation manner of the first aspect, wherein the power supply chip includes two of the transmission branches.

In a second aspect, an embodiment of the present invention further provides a multi-channel camera power supply detection system, including the multi-channel camera power supply detection circuit and a plurality of cameras described in any of the above embodiments; The output circuit is correspondingly connected with a camera.

The utility model provides a multi-channel camera power detection circuit and a multi-channel camera power detection system. The multi-channel camera power detection circuit includes a control unit and a power supply chip including a plurality of transmission branches, and each transmission branch includes an input connected to each other. Circuit and output circuit, the input circuit of each transmission branch is used to access the external voltage signal and transmit the voltage signal to the external camera connected to it through the output port of the output circuit; the power chip also includes a connection with each transmission branch. The connected I2C circuit, the control unit is connected with the I2C circuit, and the control unit is used to read the voltage signal of each transmission branch through the I2C circuit, and determine the working state of the power chip according to the read voltage signal. Using the above technology, a power chip contains multiple transmission branches, and each transmission branch can supply power for one camera, so each power chip can supply power for multiple cameras; When a power supply chip that supplies power for multi-channel cameras is detected, it only needs to occupy a set of interfaces of the MCU corresponding to the I2C circuit of the power supply chip to read the voltage signals of all transmission branches in the power supply chip, and then determine the power supply. The working state of the chip, compared with the prior art, which needs to occupy one AD port of the MCU to detect the power supply of one camera through the MCU, the use of the above technology greatly reduces the resource occupation of the MCU when the power supply of the camera is detected. .

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the following descriptions The accompanying drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a schematic structural diagram of a multi-channel camera power supply detection circuit provided by an embodiment of the present invention;

2 is a schematic structural diagram of another multi-channel camera power supply detection circuit provided by an embodiment of the present invention;

3 is a schematic structural diagram of another multi-channel camera power supply detection circuit provided by an embodiment of the present invention;

4 is a schematic structural diagram of another multi-channel camera power supply detection circuit provided by an embodiment of the present invention;

5 is a schematic structural diagram of another multi-channel camera power supply detection circuit provided by an embodiment of the present invention;

6 is a schematic structural diagram of another multi-channel camera power supply detection circuit provided by an embodiment of the present invention;

7 is a schematic structural diagram of another multi-channel camera power supply detection circuit provided by an embodiment of the present invention;

8 is a schematic structural diagram of a multi-channel camera power supply detection system provided by an embodiment of the present invention;

9 is a structural diagram of a practical application circuit of a multi-channel camera power supply detection circuit provided by an embodiment of the present invention;

FIG. 10 is another practical application circuit structure diagram of the multi-channel camera power supply detection circuit provided by the embodiment of the present invention.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

At present, the detection of the power supply of the camera is usually realized by reading the voltage changes of multiple IO ports of the power supply chip of the camera through the vehicle MCU, while the MCU reads the voltage value output by the power supply chip through the AD port. The detection needs to occupy one AD port of the MCU, and generally 4 to 6 cameras are required on the vehicle. Therefore, to detect the power supply of each camera needs to occupy 4 to 6 AD ports of the MCU, resulting in excessive MCU resource occupation. .

Based on this, the present invention provides a multi-channel camera power detection circuit, which can alleviate the problem that the MCU resources are too large when the current camera power is detected.

In order to facilitate the understanding of this embodiment, a multi-channel camera power supply detection circuit disclosed in the embodiment of the present invention is first introduced in detail.

Referring to a schematic structural diagram of a multi-channel camera power detection circuit shown in FIG. 1 , the circuit mainly includes a control unit and a power supply chip.

The above-mentioned power supply chip may include a plurality of transmission branches, and each transmission branch includes an input circuit and an output circuit connected to each other; The voltage signal is transmitted to the external camera connected to it; the above-mentioned power supply chip may also include an I2C circuit connected with each transmission branch; the control unit is connected with the I2C circuit; the control unit is used to read each transmission branch through the I2C circuit The voltage signal of the power supply chip is determined according to the read voltage signal. The above-mentioned control unit may adopt a Microcontroller Unit (MCU, MCU), a central processing unit (central processing unit, CPU), etc., which can be determined according to actual needs, which is not limited. The specific selection of the above-mentioned power chip can also be determined according to actual needs, which is not limited.

Taking FIG. 1 as an example, in FIG. 1, the multi-channel camera power detection circuit includes a control unit and a power chip, and the power chip includes N transmission branches, wherein N can be an integer greater than or equal to 2, and N The value of can be determined according to actual needs, which is not limited; the N transmission branches are composed of N input circuits and N output circuits connected in one-to-one correspondence, and the input circuit of each transmission branch is used to connect Input the external voltage signal, and transmit the voltage signal to the connected external camera through the output port of the output circuit on the transmission branch; the power chip also includes an I2C circuit connected to each transmission branch, and the control unit is connected to The I2C circuit is connected, and the control unit is used to read the voltage signal of each transmission branch through the I2C circuit, and determine the working state of the power supply chip according to the read voltage signal.

The multi-channel camera power detection circuit provided by the embodiment of the present invention includes a control unit and a power supply chip including a plurality of transmission branches, each transmission branch includes an input circuit and an output circuit connected to each other, and each transmission branch includes an input circuit and an output circuit. The input circuit is used to access the external voltage signal and transmit the voltage signal to the connected external camera through the output port of the output circuit; the power chip also includes an I2C circuit connected to each transmission branch, and the control unit is connected to the I2C circuit. connected, the control unit is used to read the voltage signal of each transmission branch through the I2C circuit, and determine the working state of the power supply chip according to the read voltage signal. Using the above technology, a power chip contains multiple transmission branches, and each transmission branch can supply power for one camera, so each power chip can supply power for multiple cameras; When a power supply chip that supplies power for multi-channel cameras is detected, it only needs to occupy a set of interfaces of the MCU corresponding to the I2C circuit of the power supply chip to read the voltage signals of all transmission branches in the power supply chip, and then determine the power supply. The working state of the chip, compared with the prior art, which needs to occupy one AD port of the MCU to detect the power supply of one camera through the MCU, the use of the above technology greatly reduces the resource occupation of the MCU when the power supply of the camera is detected. .

On the basis of the above-mentioned multi-channel camera power supply detection circuit, in order to further improve the detection accuracy of the power supply chip, the embodiment of the present invention also provides another multi-channel camera power supply detection circuit. A schematic diagram of the structure of a multi-channel camera power detection circuit. In this circuit, the power chip may also include a register connected to the I2C circuit; the register pre-stores the reference voltage corresponding to each transmission branch. For example, when a certain transmission branch normally supplies power to a camera, the transmission branch will output a working voltage to the camera through the output port of the output circuit, and the working voltage can be a fixed voltage value or a certain A dynamically changing voltage range; before the working state of the power chip is detected, the working voltage is written into the pre-register of the power chip as the reference voltage corresponding to the transmission branch. The specific writing method can be realized by the software on the control unit. For example, if the control unit is an MCU, the relevant program can be preset on the MCU. Using this program, the corresponding The reference voltages are written into registers. In the above design, the software on the control unit can be directly used to set the reference voltage corresponding to each transmission branch through the I2C circuit without additional access to hardware, which greatly improves the efficiency of the setting operation.

Based on this, the above control unit can also be used to read the reference voltage in the register through the I2C circuit, and judge the working state of the power supply chip by comparing the voltage signal of the transmission branch with the reference voltage. For example, for a certain transmission branch, the reference voltage corresponding to the transmission branch is a fixed voltage value of 11V, but the voltage output by the transmission branch to the camera through the output port of the output circuit may be lower than 11V, equal to 11V or higher If the voltage output by the transmission branch to the camera is equal to 11V, it is determined that the transmission branch is working normally; if the voltage output by the transmission branch to the camera is lower than 11V or higher than 11V, it is determined that the transmission branch is working abnormally ( such as open circuit, short circuit, etc.).

On the basis of the above-mentioned multi-channel camera power detection circuit, in order to further determine the timing for the control unit to detect the power supply chip, the embodiment of the present invention also provides another multi-channel camera power supply detection circuit. A schematic structural diagram of a multi-channel camera power supply detection circuit, in the circuit, the power supply chip may further include a feedback circuit connected with the control unit; the feedback circuit is used to determine the direction of the power supply chip when an abnormality occurs The control unit sends an alarm signal. Through this design, when an abnormality occurs in the power supply chip, the control unit can be immediately reminded to perform a detection operation on the power supply chip, which further ensures the real-time detection.

On the basis of the above-mentioned multi-channel camera power supply detection circuit, in order to further optimize the timing for the control unit to detect the power supply chip and save the resource occupation of the control unit, the embodiment of the present invention also provides another multi-channel camera power supply detection circuit. Refer to Figure 4 is a schematic structural diagram of another multi-channel camera power supply detection circuit. In this circuit, the power supply chip may further include an activation circuit connected to the I2C circuit; the above-mentioned control unit may also be used for receiving the information sent by the above-mentioned feedback circuit. After the alarm signal, the control activation circuit sends an activation signal to the I2C circuit to activate the I2C circuit. Through this design, the control unit can be reminded at the first time and the I2C circuit can be activated when the power supply chip is abnormal, so that the control unit can detect the power supply chip through the I2C circuit when the I2C circuit is in the active state, and the control unit can detect the power supply chip through the I2C circuit when the I2C circuit is inactive. In the active state, the power chip will not be detected, and the design can further save the resource occupation of the control unit while ensuring the real-time detection.

On the basis of the above-mentioned multi-channel camera power supply detection circuit, in order to input the external voltage signal into the power supply chip, the embodiment of the present invention also provides another multi-channel camera power supply detection circuit, see another multi-channel camera shown in FIG. 5 . Schematic diagram of the structure of the power supply detection circuit. In this circuit, the power supply chip is connected to the power supply unit, and the power supply unit can input voltage signals to the power supply chip to maintain the normal operation of the power supply chip. The power supply type of the above-mentioned power supply unit may adopt direct current and/or alternating current according to actual needs, which is not limited. In a practical application scenario where it is necessary to supply power to in-vehicle equipment, the power supply unit may specifically be a power supply of a vehicle power supply system (such as a battery installed on a vehicle, etc.).

On the basis of the above-mentioned multi-channel camera power supply detection circuit, in order to input the external voltage signal into the power supply chip, the embodiment of the present invention also provides another multi-channel camera power supply detection circuit, see another multi-channel camera shown in FIG. 6 . Schematic diagram of the structure of the power supply detection circuit. In this circuit, the voltage conversion circuit is respectively connected with the power supply unit and the input circuits of different transmission branches; the voltage signal output by the power supply unit can be converted into different transmission branches through the voltage conversion circuit. A voltage signal is required, and the converted voltage signal is correspondingly transmitted to the input circuits of different transmission branches.

In the actual application process, the number of power chips used can be determined according to the number of on-board cameras. When the number of on-board cameras exceeds the number of transmission branches contained in one power chip, multiple power chips need to be used to power the cameras. For the case where the multi-channel camera power detection circuit includes multiple power chips, before the control unit detects different power chips, the reference voltages corresponding to different transmission branches of a power chip are associated with the identification information of the power chip. , and write the associated reference voltage and identification information into the pre-register of the power chip. The specific writing method can be realized by the software on the control unit. For example, if the control unit is an MCU, the relevant program can be preset on the MCU. Using this program, all the transmission branches of the power chip can be corresponding to the I2C circuit. The reference voltage and the identification information of the power chip are written into the register together. Through the operation mode of associating the reference voltage with the identification information and then writing the register, when the control unit detects multiple power chips at the same time, the control unit can read the reference voltage and identification information in the register through the I2C circuit to each power chip. Each transmission branch is distinguished from a plurality of power supply chips, and then the working state of the transmission branch is judged by comparing the voltage signal of the same transmission branch with the reference voltage, and finally the working state of different power supply chips is judged.

Taking FIG. 7 as an example, referring to the schematic structural diagram of another multi-channel camera power detection circuit shown in FIG. 7, the multi-channel camera power detection circuit includes a control unit and M power chips, wherein M can be greater than or equal to 2 The value of M can be determined according to actual needs, which is not limited; the control unit is connected to the M power supply chips respectively, and the control unit can be used to detect the M power supply chips at the same time. control.

Based on the above-mentioned multi-channel camera power supply detection circuit, the embodiment of the present invention further provides a multi-channel camera power supply detection system, the system includes the above-mentioned multi-channel camera power supply detection circuit and a plurality of cameras; wherein, the transmission branch of each power supply chip The output circuit of the road is correspondingly connected with a camera.

Taking FIG. 8 as an example, refer to the schematic structural diagram of a multi-channel camera power supply detection system shown in FIG. 8 , the system includes a control unit and K power supply chips, wherein K can be an integer greater than or equal to 1, and the value of K The value can be determined according to actual needs, which is not limited; the control unit is connected to the K power chips respectively; each power chip includes n transmission branches, where n can be an integer greater than or equal to 2 , and the value of n can be determined according to actual needs, which is not limited; the output circuit of each transmission branch is correspondingly connected to a camera.

With the above design, a power chip contains multiple transmission branches, and each transmission branch can supply power for one camera, so each power chip can supply power for multiple cameras; When testing or multiple power chips, it only needs to occupy one or more interfaces of the MCU corresponding to the I2C circuit of the power chip to read the voltage signals of all transmission branches in each power chip, and then determine each The working state of the power supply chip, compared with the prior art, which needs to occupy one AD port of the MCU to detect the power supply of one camera through the MCU, the use of the above technology greatly reduces the resources of the MCU when the power supply of the camera is detected. occupied.

The specific application of the above-mentioned multi-channel camera power detection circuit can be seen in Figure 9 and Figure 10. In Figure 9 and Figure 10, the power supply chip adopts the MAX20084 type. Since the working process is similar to the above-mentioned related content, it will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that : it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the various embodiments of the present utility model Scope of technical solutions.

Claims (10)

1. A multi-path camera power supply detection circuit is characterized by comprising a control unit and a power supply chip;

the power supply chip comprises a plurality of transmission branches, and each transmission branch comprises an input circuit and an output circuit which are connected with each other; the input circuit of each transmission branch is used for accessing an external voltage signal and transmitting the voltage signal to an external camera connected with the input circuit through an output port of the output circuit;

the power supply chip further includes: an I2C circuit connected to each of the transmission legs;

the control unit is connected with the I2C circuit; the control unit is used for reading the voltage signal of each transmission branch circuit through the I2C circuit and determining the working state of the power supply chip according to the read voltage signal.

2. The multi-camera power detection circuit of claim 1, wherein the power chip further comprises a register coupled to the I2C circuit; the register prestores reference voltage corresponding to each transmission branch circuit;

the control unit is further configured to read the reference voltage in the register through the I2C circuit, and determine the operating state of the power chip by comparing the voltage signal of the transmission branch with the reference voltage.

3. The multi-channel camera power detection circuit of claim 2, wherein the power chip further comprises a feedback circuit connected to the control unit; the feedback circuit is used for sending an alarm signal to the control unit when the power supply chip is determined to be abnormal according to the voltage signal of the transmission branch and the reference voltage.

4. The multi-camera power detection circuit of claim 3, wherein the power chip further comprises an activation circuit connected to the I2C circuit; the control unit is used for controlling the activation circuit to send an activation signal to the I2C circuit after receiving the alarm signal so as to activate the I2C circuit.

5. The multi-camera power detection circuit according to any one of claims 2 to 4, further comprising a power supply unit connected to the power chip; the power supply unit is used for inputting voltage signals for the power supply chip.

6. The multi-channel camera power detection circuit according to claim 5, further comprising a voltage conversion circuit, wherein the voltage conversion circuit is respectively connected to the power supply unit and the input circuits of different transmission branches; the voltage conversion circuit is used for converting the voltage signals output by the power supply unit into voltage signals required by different transmission branches respectively and correspondingly transmitting the converted voltage signals to input circuits of different transmission branches respectively.

7. The multi-channel camera power detection circuit according to claim 6, wherein there are a plurality of power chips; and the reference voltage prestored by the register is associated with the identification information of the power supply chip.

8. The multi-channel camera power detection circuit according to claim 7, wherein the multi-channel camera power detection circuit comprises at least two of the power chips.

9. The multi-channel camera power detection circuit according to claim 7, wherein the power chip comprises two of the transmission branches.

10. A multi-camera power detection system, comprising the multi-camera power detection circuit of any one of claims 1 to 9 and a plurality of cameras; and the output circuit of each transmission branch is correspondingly connected with one camera.

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