Multi-camera networking power supply control device

Abstract

The utility model discloses a multi-camera networking power supply control device and a protection system. The device comprises a vehicle battery module, a plurality of voltage conversion modules, an MCU control module and a plurality of camera modules, the vehicle battery module is connected with the input end of each voltage conversion module; the output end of each voltage conversion module is connected with the power supply end of each camera module; the control end of the MCU control module is electrically connected with the enabling end of each voltage conversion module; the sampling end of the MCU control module is electrically connected with the output end of the ADC sampling module; the input end of the ADC sampling module is connected with the input end of each voltage conversion module; the multi-serial port end of the MCU control module is electrically connected with the serial port end of each camera module; each camera module is also in communication connection with remote equipment; or the single serial port end of the MCU control module is connected with the serial port end of each camera module. According to the scheme, the vehicle battery module voltage can be detected and protected flexibly in real time.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to a multi-camera networking technical field, especially to a multi-camera networking power control device. BACKGROUND

[0002] Camera networking needs to include at least two camera devices or more camera devices; at present, in the camera networking scene in the car, the car battery can power multiple camera devices, and the battery needs to detect the battery voltage in real time and protect the battery voltage while powering multiple camera devices; at present, in the battery power supply scheme for multiple camera modules in the prior art, real-time flexible detection of the car battery voltage and protection of the battery voltage cannot be achieved. UTILITY MODEL CONTENT

[0003] The embodiment of the utility model provides a multi-camera networking power control device, which realizes real-time flexible detection of the car battery voltage and protection of the car battery module voltage, and ensures that the car battery module is not fed.

[0004] To achieve the above purpose, the embodiment of the utility model provides a multi-camera networking power control device, which comprises: a car battery module, a plurality of voltage conversion modules, an ADC sampling module, an MCU control module, a plurality of camera modules and a remote device.

[0005] The input end of each voltage conversion module is connected with the car battery module; the output end of each voltage conversion module is connected with the power supply end of each camera module; the control end of the MCU control module is electrically connected with the enable end of each voltage conversion module; the sampling end of the MCU control module is electrically connected with the output end of the ADC sampling module; the input end of the ADC sampling module is connected with the input end of each voltage conversion module.

[0006] The multi-serial port end of the MCU control module is electrically connected with the serial port end of each camera module; each camera module is also in communication connection with the remote device.

[0007] Alternatively, the single serial port end of the MCU control module is connected with the serial port end of each camera module.

[0008] Optionally, the device further comprises an LDO module; the power supply start end of the MCU control module is electrically connected with the output end of the LDO module; the input end of the LDO module is connected with the car battery module.

[0009] Optionally, the control start end of the MCU control module is connected with the start end of the car battery module.

[0010] Optionally, the voltage conversion module comprises a DC / DC circuit.

[0011] Optionally, the DC / DC circuit comprises a unidirectional diode, a transient diode, a first capacitor, a second capacitor, a first inductor, a third capacitor, a buck chip, a second inductor, a fourth capacitor, a fifth capacitor, a first voltage dividing resistor and a second voltage dividing resistor.

[0012] The first end of the unidirectional diode is an input end of the voltage conversion module and is electrically connected with the vehicle battery module; the second end of the unidirectional diode is electrically connected with the first end of the transient diode, the first end of the first capacitor, the first end of the second capacitor and the first end of the first inductor; the second end of the first inductor is electrically connected with the first end of the third capacitor and the input end of the buck chip; the second end of the transient diode, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are grounded; the start output end of the buck chip is electrically connected with the first end of the second inductor; the second end of the second inductor is electrically connected with the first end of the first voltage dividing resistor, the first end of the fourth capacitor and the first end of the fifth capacitor, and is connected with the power supply end of the camera module; the second end of the first voltage dividing resistor is electrically connected with the feedback end of the buck chip and the first end of the second voltage dividing resistor; the second end of the second voltage dividing resistor, the second end of the fourth capacitor and the second end of the fifth capacitor are grounded.

[0013] Optionally, the model of the MCU control module is GD32F303CB.

[0014] Optionally, the LDO module comprises an LDO circuit; the LDO circuit comprises a reference source, an amplifier, a first transistor, a third voltage dividing resistor and a fourth voltage dividing resistor.

[0015] The reference source is electrically connected with the negative input end of the amplifier; the positive input end of the amplifier is electrically connected with the second end of the third voltage dividing resistor and the first end of the fourth voltage dividing resistor; the first end of the first transistor is electrically connected with the negative input end of the amplifier; the first end of the first transistor is an input end of the LDO module; the control end of the first transistor is electrically connected with the output end of the amplifier; the second end of the first transistor is electrically connected with the first end of the third voltage dividing resistor; the first end of the third voltage dividing resistor is an output end of the LDO module; the second end of the fourth voltage dividing resistor is grounded.

[0016] The utility model discloses an embodiment, the MCU control module's multi serial ports end with each camera module's serial ports electric connection, each camera module still with remote device communication connection, MCU control module can gather the voltage size that battery output is to each voltage conversion module through ADC sampling module real time like this, and the real time voltage is sent to each camera module through its multi serial ports, and remote device can read the voltage size, when the voltage that MCU control module detects is lower than battery protection voltage, can send the voltage to each camera module through its multi serial ports, and remote device can also read the voltage size, and when determining that the voltage is lower than battery protection voltage, sends the power -off instruction to any camera module, and the corresponding camera module feeds back the power -off preparation ready instruction to MCU control module, and MCU control module controls each voltage conversion module to disconnect the power supply to each camera module through its enable end, and thus realizes the real -time flexible detection car battery voltage through remote device, and also realizes the protection to battery voltage through remote device, guarantees that battery does not feed the electricity.

[0017] Or, the MCU control module's single serial ports end is connected with each camera module's serial ports, specifically, camera module includes main camera module and other each from camera module, the single serial ports end of MCU control module is connected with the serial ports end of main camera module, and the single serial ports end of MCU control module is connected with the serial ports end of other from camera module, each camera module still with remote device communication connection, MCU control module can gather the voltage size that battery output is to each voltage conversion module through ADC sampling module real time like this, and the real time voltage is sent to each camera module through its single serial ports, and remote device can read the voltage size, and when the voltage that MCU control module detects is lower than battery protection voltage, can send the voltage to each camera module, and remote device can also read the voltage size, and when determining that the voltage is lower than battery protection voltage, since from camera module cannot feed back at this time, directly sends the power -off instruction to main camera module, and main camera module feeds back the power -off preparation ready instruction to MCU control module, and MCU control module controls each voltage conversion module to disconnect the power supply to each camera module through its enable end, and thus realizes the real -time flexible detection car battery voltage through remote device, and also realizes the protection to battery voltage through remote device, guarantees that battery does not feed the electricity.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, and is not used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 is a structural schematic diagram of a multi-camera networking power supply control device provided by the embodiment of the present application;

[0021] Figure 2 is a structural schematic diagram of another multi-camera networking power supply control device provided by the embodiment of the present application;

[0022] Figure 3 is a structural schematic diagram of another multi-camera networking power supply control device provided by the embodiment of the present application;

[0023] Figure 4 is a structural schematic diagram of another multi-camera networking power supply control device provided by the embodiment of the present application;

[0024] Figure 5 is a specific structural schematic diagram of a multi-camera networking power supply control device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0026] It should be noted that the terms "first", "second", and the like in the description, claims, and drawings of the present application are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0027] Figure 1 is a structural schematic view of a multi-camera networking power supply control device provided by the embodiment of the utility model, as shown in the figure, the multi-camera networking power supply control device comprises: a vehicle battery module 10, a plurality of voltage conversion modules 20, an ADC sampling module 30, an MCU control module 40, a plurality of camera modules 50 and a remote device 60; the vehicle battery module 10 is connected with the input end of each voltage conversion module 20; the output end of each voltage conversion module 20 is connected with the power supply end of each camera module 50; Figure 1

[0028] The enable end EN of the MCU control module 40 is electrically connected with the control end of each voltage conversion module 20; the sampling end ADC of the MCU control module 40 is electrically connected with the output end of the ADC sampling module 30; the input end of the ADC sampling module 30 is connected with the input end of each voltage conversion module 20; the multi-serial port end TX / RX of the MCU control module 40 is electrically connected with the serial port end TX / RX of each camera module 50; each camera module 50 is further in communication connection with the remote device 60.

[0029] Among them, the vehicle battery module 10 can be a battery module for providing necessary power for the starting, ignition and operation of all electronic devices of the vehicle; the voltage conversion module 20 can convert the voltage output by the vehicle battery module 10 into the voltage for the operation of the camera module, and the voltage conversion module 20 can be a DC / DC circuit; the multi-serial port end TX / RX of the MCU control module 40 can be connected with the serial port end TX / RX of each camera module 50, and each camera module 50 can be independently communicated with the MCU control module 40; the model of the MCU control module 40 can be: GD32F303CB. Each camera module 50 can be communicated with the remote device through BLE and transmit data through the Wifi module;

[0030] ​The utility model embodiment, MCU control module 40's multi serial ports TX / RX and each camera module 50's serial ports electric connection, each camera module 50 still with remote device 60 communication connection, MCU control module 40 can collect the voltage size that each voltage conversion module 20 is outputted to by ADC sampling module 30 in real time to each camera module 50 by its multi serial ports TX / RX in real time with voltage to each camera module 50 by real-time voltage through its multi serial ports TX / RX sending, so that remote device 60 can read the voltage size, so through remote device realizes real-time flexible detection car battery module 10 voltage, when the voltage that MCU control module 40 detects is lower than battery protection voltage, can also send the voltage to each camera module 50 through its multi serial ports, remote device 60 can read the voltage size at this moment, and when further determine that the voltage is lower than battery protection voltage, sends power-off instruction to any camera module 50, corresponding camera module 50 sends power-off preparation ready instruction to MCU control module through its serial ports TX / RX, and MCU control module 40 controls each voltage conversion module 20 to disconnect the power supply to each camera module 50 through its enable end EN, so through remote device also realizes the protection to car battery module voltage, guarantees car battery module not to feed power.

[0031] Considering that the camera module may appear the situation of freezing, when remote device 60 cannot read the voltage, MCU control module 40 can also control each voltage conversion module 20 to disconnect the power supply to each camera module 50 through its enable end EN when not receiving the power-off preparation ready instruction of corresponding camera module 50 through its serial ports TX / RX within the preset time, so that the problem that car battery module 10 is in the state of always being powered on when the camera module freezes, causing the damage of car battery module, is avoided, and MCU control module 40 can also individually reset the camera module after controlling each voltage conversion module 20 to disconnect the power supply to each camera module 50.

[0032] It should be noted that in the embodiment, the car battery module 10 is connected to the input end of each voltage conversion module 20, and the output end of each voltage conversion module 20 is connected to the power supply end of each camera module 50, so that independent power supply for each camera module 50 is realized, and the problem that all the other camera modules are powered off and cannot work normally when one camera module freezes in the prior art is avoided.

[0033] In addition, the multi-serial port end TX / RX of the MCU control module 40 is electrically connected with the serial port end TX / RX of each camera module 50, so that each camera module is in independent communication with the MCU control module 40, and if any camera module is abnormal, the communication between the other camera modules and the MCU control module 40 will not be affected; meanwhile, each camera module is in mutual communication through the MCU control module 40, so that the on-off time of different camera modules can be synchronized, thereby solving the problem of different on-off time of different camera modules in network formation.

[0034] In other embodiments, Figure 2 is a structural schematic diagram of another multi-camera networking power supply control device provided by the embodiment of the utility model; as Figure 2 indicated, the same as the above-mentioned embodiment is that the vehicle battery module 10 is connected with the input end of each voltage conversion module 20; the output end of each voltage conversion module 20 is connected with the power supply end of each camera module 50; the enable end EN of the MCU control module 40 is electrically connected with the control end of each voltage conversion module 20; the sampling end ADC of the MCU control module 40 is electrically connected with the output end of the ADC sampling module 30; the input end of the ADC sampling module 30 is connected with the input end of each voltage conversion module 20; the difference is that the camera module comprises a main camera module and other slave camera modules; the single serial port end TX / RX of the MCU control module 40 is connected with the serial port end TX / RX of the main camera module, and the single serial port end TX / RX of the MCU control module is connected with the serial port end RX of the other slave camera modules; the serial port end of each camera module is also in communication connection with the remote device 60;

[0035] In the embodiment, the serial port end of the MCU control module 40 is a single serial port end; the single serial port end TX / RX of the MCU control module 40 is connected with the serial port end TX / RX of the main camera module, so that the MCU control module and the main camera module can be in receiving and transmitting mutual communication; and the single serial port end TX / RX of the MCU control module 40 is connected with the serial port end RX of the other slave camera modules, so that when the single serial port end of the MCU control module 40 sends information, the other slave camera modules can passively receive and cannot respond;

[0036] Specifically, in the embodiment, the MCU control module 40 can collect the voltage output by the vehicle battery module 10 to each voltage conversion module 20 in real time through the ADC sampling module 30, and send the real-time voltage to each camera module 50 through the single serial port thereof, so that the remote device 60 can read the voltage, and thus the voltage of the vehicle battery module 10 can be detected in real time and flexibly through the remote device; when the detected voltage is lower than the battery protection voltage, the MCU control module 40 can send the voltage to each camera module through the single serial port thereof, so that the remote device 60 can read the voltage, and when it is further determined that the voltage is lower than the battery protection voltage, a power-off instruction can be sent to the main camera module at this time (it can be understood that the slave camera module cannot respond at this time), the main camera module feeds back a power-off preparation ready instruction to the MCU control module 40, and the MCU control module 40 thus controls each voltage conversion module 20 to disconnect the power supply to each camera module through the enable end thereof, so that the voltage of the vehicle battery module is also protected through the remote device 60, and the vehicle battery module is prevented from being fed with power.

[0037] In view of some special cases, when the remote device 60 determines that the voltage cannot be read, if the reason why the voltage cannot be read is that the main camera module is dead, the MCU control module 40 can also control each voltage conversion module 20 to disconnect the power supply to each camera module 50 through the enable end EN if the power-off preparation ready instruction fed back by the main camera module 50 through the serial port TX / RX thereof is not received within a preset time, so that the problem that the vehicle battery module is in a state of being powered all the time when the main camera module is dead and the vehicle battery is damaged is avoided; after controlling each voltage conversion module 20 to disconnect the power supply to each camera module 50, the MCU control module can also reset the main camera module alone.

[0038] Optionally, on the basis of the above Figure 1 and Figure 2 embodiments, the multi-camera networking power supply control device is further optimized, Figure 3 is a structural schematic view of another multi-camera networking power supply control device provided by the embodiment of the utility model; Figure 4 is a structural schematic view of another multi-camera networking power supply control device provided by the embodiment of the utility model; as Figures 3-4 shown, the multi-camera networking power supply control device further comprises an LDO module 70; the power-on end LDO of the MCU control module 40 is electrically connected with the output end of the LDO module 70; and the input end of the LDO module 70 is connected with the vehicle battery module 10. Wherein, the LDO module 70 can convert the voltage of the vehicle battery module 10 into a stable working voltage of the MCU control module 40.

[0039] Optionally, continuing to refer to Figures 3-4The starting end ACC of the MCU control module 40 is connected with the starting end of the vehicle battery module 10.

[0040] The multi-camera networking power supply control device is described below with specific circuit diagrams, Figure 5 is a specific structure schematic diagram of a multi-camera networking power supply control device provided by the embodiment of the utility model; as Figure 5 The voltage conversion module 20 includes a DC / DC circuit; the DC / DC circuit includes a unidirectional diode SD1, a transient voltage suppressor TVS, a first capacitor C1, a second capacitor C2, a first inductor L1, a third capacitor C3, a voltage reduction chip U1, a second inductor L2, a fourth capacitor C4, a fifth capacitor C5, a first voltage dividing resistor R1 and a second voltage dividing resistor R2; the first end of the unidirectional diode SD1 is the input end of the voltage conversion module and is electrically connected with the vehicle battery module 10; the second end of the unidirectional diode SD1 is electrically connected with the first end of the transient voltage suppressor TVS, the first end of the first capacitor C1, the first end of the second capacitor C2 and the first end of the first inductor L1; the second end of the first inductor L1 is electrically connected with the first end of the third capacitor C3 and the input end IN of the voltage reduction chip U1; the second end of the transient voltage suppressor TVS, the second end of the first capacitor C1, the second end of the second capacitor C2 and the second end of the third capacitor C3 are grounded; the starting output end SW of the voltage reduction chip U1 is electrically connected with the first end of the second inductor L2; the second end of the second inductor L2 is electrically connected with the first end of the first voltage dividing resistor R1, the first end of the fourth capacitor C4 and the first end of the fifth capacitor C5 and is connected with the power supply end of the camera module 50; the second end of the first voltage dividing resistor R1 is electrically connected with the feedback end of the voltage reduction chip U1 and the first end of the second voltage dividing resistor R2; the second end of the second voltage dividing resistor R2, the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5 are grounded.

[0041] The unidirectional diode SD1, the transient diode TVS, the first capacitor C1, the second capacitor C2, the first inductor L1, the third capacitor C3, the voltage reduction chip U1, the second inductor L2, the fourth capacitor C4, the fifth capacitor C5, the first voltage division resistor R1 and the second voltage division resistor R2 constitute the DC / DC circuit, and can play a role of voltage reduction; specifically, the unidirectional diode SD1 plays a role of anti-reverse connection; the transient diode TVS plays a role of anti-surge; the first capacitor C1, the second capacitor C2, the first inductor L1 and the third capacitor C3 play a role of filtering electromagnetic signal interference; the second inductor L2, the fourth capacitor C4 and the fifth capacitor C5 play a role of filtering the voltage output by the voltage reduction chip U1; the first voltage division resistor R1 and the second voltage division resistor R2 can feed back the voltage output by the voltage reduction chip U1 to the voltage reduction chip U1 in real time, so that the voltage reduction chip U1 outputs stable voltage to the camera module 50.

[0042] Optionally, continuing to refer to Figure 5 , the LDO module 70 comprises: an LDO circuit; the LDO circuit comprises: a reference source Vref, an amplifier U2, a first transistor Q1, a third voltage division resistor R3 and a fourth voltage division resistor R4; the reference source Vref is electrically connected with the negative input end of the amplifier U2; the positive input end of the amplifier U2 is electrically connected with the second end of the third voltage division resistor R3 and the first end of the fourth voltage division resistor R4; the negative input end of the amplifier U2 is electrically connected with the first end of the first transistor Q1; the first end of the first transistor Q1 is used as the input end of the LDO module; the control end of the first transistor Q1 is electrically connected with the output end of the amplifier U2; the second end of the first transistor Q1 is electrically connected with the first end of the third voltage division resistor R3; the first end of the third voltage division resistor R3 is used as the output end of the LDO module; the second end of the fourth voltage division resistor R4 is grounded.

[0043] The LDO circuit composed of the reference source Vref, the amplifier U2, the first transistor Q1, the third voltage division resistor R3 and the fourth voltage division resistor R4 can convert the voltage of the vehicle battery module 10 into stable working voltage of the MCU control module 40; specifically, the reference voltage Vref of the reference source and the feedback voltage FB (FB is the voltage divided by the third voltage division resistor R3 and the fourth voltage division resistor R4) are connected to the reverse and positive ends of the amplifier U2 respectively, and then the error amount is output, and then the output voltage is adjusted by the first transistor Q1 to achieve stable output. When the output voltage increases, FB increases, the output voltage of the amplifier U2 increases, the G electrode voltage of the first transistor Q1 increases, Usg decreases, the output current and voltage of the first transistor Q1 are small, and a negative feedback system is formed. Thus, through the LDO circuit, the working voltage of the MCU control module 40 can be stabilized at a specific value.

[0044] It should be noted that the above only the preferred embodiments of the present application and the use of technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, those skilled in the art can make various obvious changes, re-adjustment and replacement without departing from the scope of the present application. Therefore, although the above embodiments of the present application has been described in more detail, but the present application is not limited to the above examples, without departing from the concept of the present application, but also can include more other equivalent embodiments, and the scope of the present application is determined by the appended claims.

Claims

1. A multi-camera networked power control device, comprising: The application relates to a vehicle battery module, a plurality of voltage conversion modules, an ADC sampling module, an MCU control module, a plurality of camera modules and a remote device. The input end of the vehicle battery module is connected with the input end of each voltage conversion module; the output end of each voltage conversion module is connected with the power supply end of each camera module; the control end of the MCU control module is electrically connected with the enable end of each voltage conversion module; the sampling end of the MCU control module is electrically connected with the output end of the ADC sampling module; and the input end of the ADC sampling module is connected with the input end of each voltage conversion module. The multi-serial port end of the MCU control module is electrically connected with the serial port end of each camera module; and each camera module is further in communication connection with a remote device. Alternatively, the single-serial port end of the MCU control module is connected with the serial port end of each camera module. The application further relates to an LDO module.

2. The multi-camera networked power control apparatus of claim 1, wherein, The power supply starting end of the MCU control module is electrically connected with the output end of the LDO module; and the input end of the LDO module is connected with the vehicle battery module. The control starting end of the MCU control module is connected with the starting end of the vehicle battery module. The voltage conversion module comprises a DC / DC circuit.

3. The multi-camera networked power control apparatus of claim 1, wherein, The DC / DC circuit comprises a unidirectional diode, a transient diode, a first capacitor, a second capacitor, a first inductor, a third capacitor, a step-down chip, a second inductor, a fourth capacitor, a fifth capacitor, a first voltage division resistor and a second voltage division resistor.

4. The multi-camera networked power control apparatus of claim 1, wherein, The first end of the unidirectional diode is the input end of the voltage conversion module and is electrically connected with the vehicle battery module; the second end of the unidirectional diode is electrically connected with the first end of the transient diode, the first end of the first capacitor, the first end of the second capacitor and the first end of the first inductor; the second end of the first inductor is electrically connected with the first end of the third capacitor and the input end of the step-down chip; the second end of the transient diode, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are grounded; the starting output end of the step-down chip is electrically connected with the first end of the second inductor; the second end of the second inductor is electrically connected with the first end of the first voltage division resistor, the first end of the fourth capacitor and the first end of the fifth capacitor and is connected with the power supply end of the camera module; the second end of the first voltage division resistor is electrically connected with the feedback end of the step-down chip and the first end of the second voltage division resistor; the second end of the second voltage division resistor, the second end of the fourth capacitor and the second end of the fifth capacitor are grounded.

5. The multi-camera networked power control apparatus of claim 4, wherein, The model of the MCU control module is GD32F303CB. The LDO module comprises an LDO circuit; and the LDO circuit comprises a reference source, an amplifier, a first transistor, a third voltage division resistor and a fourth voltage division resistor.

6. The multi-camera networked power control apparatus of claim 1, wherein, ​ 7. The multi-camera networked power control apparatus of claim 2, wherein, ​ The reference source is electrically connected with the negative input end of the amplifier; the positive input end of the amplifier is electrically connected with the second end of the third voltage dividing resistor and the first end of the fourth voltage dividing resistor; the negative input end of the amplifier is electrically connected with the first end of the first transistor; the first end of the first transistor serves as the input end of the LDO module; the control end of the first transistor is electrically connected with the output end of the amplifier; the second end of the first transistor is electrically connected with the first end of the third voltage dividing resistor; the first end of the third voltage dividing resistor serves as the output end of the LDO module; and the second end of the fourth voltage dividing resistor is grounded.

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