CN114362096B - Power management circuit of vehicle-mounted entertainment system - Google Patents
Power management circuit of vehicle-mounted entertainment system Download PDFInfo
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Abstract
The application provides a power management circuit of a vehicle-mounted entertainment system, which comprises: the device comprises an MCU unit, an MOS tube unit, a signal control unit, a main control chip and a filter circuit, wherein the input end of the MOS tube unit is connected with a power supply, the output end of the MOS tube unit is connected with the main control chip, and the filter circuit is connected with the power supply and the input end of the MOS tube unit; the main control chip is also connected with the MCU unit and the reset chip, when the circuit voltage is lower than the protection threshold value of the reset chip, the reset chip is triggered to carry out low-voltage protection, so that the main control chip is in a power-off state, a power supply is protected, and when the MCU unit detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, the main control chip is powered, and the vehicle-mounted entertainment system is restarted. Above-mentioned on-vehicle entertainment system's power management circuit, through power protection circuit, avoid the power to appear feeding, solved among the prior art because lack reasonable circuit protection measure, lead to the whole car to appear circumstances such as feeding easily, influence the life of power and cause the technical problem of bad user experience.
Description
Technical Field
The application relates to the technical field of vehicle-mounted power management, in particular to a power management circuit of a vehicle-mounted entertainment system.
Background
With the continuous development of society, automobiles enter into thousands of households, and with the development and progress of science and technology, the functions of automobiles are increasing.
In the automobile industry, the functions of the vehicle-mounted entertainment system are more and more complex, and the power distribution and management are required to be reasonably designed, so that the functions of the entertainment system are enriched, the travelling pleasure is increased, and intelligent travelling services are provided for users. The vehicle-mounted entertainment system is a vehicle-mounted integrated information processing system which is formed by adopting a vehicle-mounted special central processing unit and based on a vehicle body bus system and Internet service.
In the prior art, the number of the whole vehicle functional modules is increased, and due to the lack of reasonable circuit protection measures, the situation that the power supply requirement of the whole vehicle module is increased to cause feeding and the like is easy to occur, so that the service life of the power supply is seriously influenced, and bad user experience is caused.
Disclosure of Invention
Based on the above, the application aims to provide a power management circuit, a system, a storage medium and equipment of a vehicle-mounted entertainment system, which are used for solving the technical problems that in the prior art, the situation of feeding and the like easily occurs to the whole vehicle due to the lack of reasonable circuit protection measures, thereby seriously influencing the service life of a power supply and causing bad user experience.
One aspect of the present application provides a power management circuit for a vehicle-mounted entertainment system, comprising:
the power management circuit further comprises a main control chip and a filter circuit, wherein the input end of the MOS tube unit is connected with a power supply, the output end of the MOS tube unit is connected with the main control chip, the output end of the MOS tube unit provides electric quantity required by working for the main control chip, and the filter circuit is connected with the power supply and the input end of the MOS tube unit;
the main control chip is also connected with the MCU unit and the reset chip, when the circuit voltage is lower than the protection threshold value of the reset chip, the reset chip is triggered to carry out low-voltage protection, so that the main control chip is reset, the main control chip outputs a low-level signal to the MCU unit, and when the MCU unit receives the low-level signal, the signal control unit controls the MOS tube unit to be disconnected, so that the main control chip is in a power-off state and the power supply is protected;
when the MCU unit detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, the MCU unit outputs a high-level signal to the MOS tube unit, conducts the working circuit of the main control chip, supplies power to the main control chip, and restarts the vehicle-mounted entertainment system.
According to the power management circuit of the vehicle-mounted entertainment system, the power supply is prevented from being fed through the power supply protection circuit, and particularly, the MCU unit, the MOS tube unit and the signal control unit are arranged, when the circuit voltage is lower than the protection threshold value of the reset chip, the reset chip is triggered to carry out low-voltage protection, so that the main control chip resets, the main control chip outputs a low-level signal to the MCU unit, when the MCU unit receives the low-level signal, the MOS tube unit is controlled to be disconnected through the signal control unit, so that the main control chip is in a power-off state, the power supply is protected, the situation that the whole vehicle is fed is avoided, and the service life of the power supply is prolonged; when the MCU unit detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, the MCU unit outputs a high-level signal to the MOS tube unit, the working circuit of the main control chip is conducted, the main control chip is powered, the vehicle-mounted entertainment system is restarted, the vehicle-mounted entertainment system can be restarted automatically when the service life of the power supply is prolonged, the user experience is improved, the technical problems that in the prior art, the situation that feeding and the like occur to the whole vehicle easily due to lack of reasonable circuit protection measures are solved, the service life of the power supply is seriously influenced, and poor user experience is caused are solved.
In addition, the power management circuit of the vehicle-mounted entertainment system according to the application can also have the following additional technical characteristics:
further, the power management circuit further comprises a power conversion unit, the power conversion unit is connected with the MCU unit and the main control chip, and when the MCU unit detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, the power conversion unit supplies power to the main control chip, and the vehicle-mounted entertainment system is restarted.
Further, the MOS tube unit adopts a PMOS tube.
Further, the signal control unit comprises a PNP type triode and two voltage dividing resistors, wherein the input end of the PNP type triode is connected with the intersection point of the connecting lines of the two voltage dividing resistors, the collector electrode of the PNP type triode is connected with the control end of the MOS tube unit, and the emitter electrode of the PNP type triode is grounded.
Further, a safety unit is further arranged between the filter circuit and the power supply, and the safety unit is a fuse.
Further, the filter circuit is an RC filter circuit.
Further, the power management circuit further comprises a WIFI/BT chip, an EMMC memory chip and an AVM module decoding chip, wherein the WIFI/BT chip is connected with the output end of the MOS tube unit respectively.
Further, the MOS tube unit adopts a MOS tube with the model RQ1A070 ZP.
Drawings
FIG. 1 is a block diagram of a circuit connection system in an embodiment of the application;
FIG. 2 is a circuit connection block diagram of a MOS transistor unit and an MCU unit in the embodiment of the application;
fig. 3 is a detailed circuit connection diagram of the MOS transistor unit and the MCU unit in the embodiment of the present application.
Description of main reference numerals:
| MOS tube unit | 100 | Filtering circuit | 200 |
| Signal control unit | 300 | Safety unit | 400 |
| MCU unit | 500 |
The application will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Several embodiments of the application are presented in the figures. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, a power management circuit of an in-vehicle entertainment system according to an embodiment of the application includes:
MCU unit 500, MOS pipe unit 100 and connect MCU unit 500 and MOS pipe unit 100's signal control unit 300, power management circuit still includes main control chip and filter circuit 200, and the power is connected to MOS pipe unit 100's input, and main control chip is connected to the output, and the power that the power required is provided for main control chip to MOS pipe unit 100's output, and filter circuit 200 connects the input of power and MOS pipe unit 100.
The filter circuit 200 is an RC filter circuit, a fuse unit 400 is further disposed between the filter circuit 200 and the power supply, the fuse unit 400 is a fuse, in this embodiment, the maximum current passed by the fuse is 7a, the capacitance in the RC filter circuit is 0.47 μf, and the resistance is 10kΩ.
The main control chip is also connected with the MCU unit 500 and the reset chip, when the circuit voltage is lower than the protection threshold value of the reset chip, the reset chip is triggered to carry out low-voltage protection, so that the main control chip is reset, the main control chip outputs a low-level signal to the MCU unit 500, when the MCU unit 500 receives the low-level signal, the MOS tube unit 100 is controlled to be disconnected through the signal control unit 300, and the main control chip is in a power-off state and protects a power supply;
when the MCU unit 500 detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, the MCU unit 500 outputs a high-level signal to the MOS tube unit 100, conducts a working circuit of the main control chip, supplies power to the main control chip, and restarts the vehicle-mounted entertainment system.
As a specific example, the power management circuit further includes a power conversion unit, where the power conversion unit connects the MCU unit 500 and the main control chip, and when the MCU unit 500 detects that the vehicle ignition signal and the vehicle power signal are normal, the main control chip is powered through the power conversion unit, and the vehicle entertainment system is restarted. Specifically, in the present embodiment, the output voltages of the power supply converted by the power conversion unit are 1.8v, 1.35v and 1.1v.
When the microcontroller MCU detects that BU_DET/ACC_DET are normal, the microcontroller MCU pulls P_ON high to work again in a set period of 200ms, the P_ON is input to the power conversion unit DCDC, the main control chip SOC is started normally, and the entertainment system is started normally.
As a specific example, the power management circuit further includes a WIFI/BT chip, an EMMC memory chip, and an AVM module decoding chip, which are connected to the output end of the MOS transistor unit 100, respectively, and specifically, the WIFI/BT IC, such as NF33067; AVM decoding chips such as Max9288; EMMC, such as 32G; the power input DC of the present circuit is 3.3V.
In this embodiment, the MOS transistor unit 100 adopts a PMOS transistor, and as a specific example, a MOS transistor with a model RQ1a070ZP is adopted. The MOS tube is responsible for monitoring the current of the whole circuit, when the current through the MOS tube is increased, the voltage drop is increased, and the current is lower than the reset chip protection threshold U of voltage monitoring max And when the Reset chip Reset IC is triggered to carry out low-voltage protection, the main control chip SOC is Reset.
The MOS tube is connected with the MCU, the voltage monitoring Reset chip Reset IC, the WIFI/BT chip, the EMMC memory chip, the AVM module decoding chip and a plurality of resistors R and capacitors C required by the surrounding environment, and receives the input ground DC3.3.V power supply of the entertainment system.
In this embodiment, the signal control unit 300 includes a PNP type triode and two voltage dividing resistors, the input end of the PNP type triode is connected to the intersection point of the wires of the two voltage dividing resistors, the collector of the PNP type triode is connected to the control end of the MOS transistor unit 100, the emitter of the PNP type triode is grounded, and specifically, the resistance value of the voltage dividing resistor is 10kΩ.
In the present embodiment, the voltage is detected by the RESET IC (detected voltage: U min ～U 2 ) Monitoring whether the 3.3V voltage of the SOC is normal, if the voltage is found to be lower than U 2 The SOC system is RESET by RESET IC hard-wire.
Through a switching tube MOS IC, the protection threshold U of the reset chip is lower than the voltage monitoring 2 The maximum current theory without dropping to 3.111V is calculated as follows: i max ＝(U1-U 2 )/R mos I.e. the maximum current of the circuit design is I max When the current through the switching tube MOS IC is higher than I max When the RESET IC is triggered to RESET the SOC system, after the SOC system is RESET, a P_OFF low level signal output by the SOC IC is output to the MCU, the MCU pulls down the output P_ON to 0V 500ms after receiving the P_OFF, the power supply of the SOC is powered OFF, and the entertainment system is powered OFF, so that the effect of protecting the system is achieved.
When the MCU detects that the BU_DET/ACC_DET is normal, namely when the MCU unit 500 detects that the vehicle ignition signal and the vehicle power supply signal are normal, the setting period is 200ms, the P_ON is pulled up to 3.3V again, the SOC is started normally, and the entertainment system is started normally.
The protection logic of the power management circuit in the scheme of the application is as follows:
the switch tube MOS is responsible for monitoring the current of the whole circuit, when the current of the MOS tube through the switch tube increases, the voltage drop increases, and the current is lower than the reset chip protection threshold U of voltage monitoring max Triggering RESET IC low voltage protection to RESET the main control chip SOC; the P_OFF low level signal output by the main control chip SOC is given to the micro controller MCU, and the micro controllerThe MCU pulls down the output P_ON to 0V within 500ms after receiving the P_OFF, cuts OFF the power supply of the main control chip SOC, and the entertainment system is shut down, thereby achieving the effect of protecting the system.
In summary, the power management circuit of the vehicle-mounted entertainment system in the above embodiment of the present application avoids the power supply from feeding through the power protection circuit, specifically, sets the MCU unit, the MOS transistor unit and the signal control unit, when the circuit voltage is lower than the protection threshold of the reset chip, triggers the reset chip to perform low voltage protection, so as to cause the reset of the main control chip, the main control chip outputs a low level signal to the MCU unit, when the MCU unit receives the low level signal, controls the MOS transistor unit to be disconnected through the signal control unit, so that the main control chip is in a power-off state, the power supply is protected, the situation that the whole vehicle feeds is avoided, and the service life of the power supply is prolonged; when the MCU unit detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, the MCU unit outputs a high-level signal to the MOS tube unit, the working circuit of the main control chip is conducted, the main control chip is powered, the vehicle-mounted entertainment system is restarted, the vehicle-mounted entertainment system can be restarted automatically when the service life of the power supply is prolonged, the user experience is improved, the technical problems that in the prior art, the situation that feeding and the like occur to the whole vehicle easily due to lack of reasonable circuit protection measures are solved, the service life of the power supply is seriously influenced, and poor user experience is caused are solved.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or other suitable medium upon which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A power management circuit for an in-vehicle entertainment system, comprising:
the power management circuit further comprises a main control chip and a filter circuit, wherein the input end of the MOS tube unit is connected with a power supply, the output end of the MOS tube unit is connected with the main control chip, the output end of the MOS tube unit provides electric quantity required by working for the main control chip, and the filter circuit is connected with the power supply and the input end of the MOS tube unit;
the main control chip is also connected with the MCU unit and the reset chip, when the circuit voltage is lower than the protection threshold value of the reset chip, the reset chip is triggered to carry out low-voltage protection, so that the main control chip is reset, the main control chip outputs a low-level signal to the MCU unit, and when the MCU unit receives the low-level signal, the signal control unit controls the MOS tube unit to be disconnected, so that the main control chip is in a power-off state and the power supply is protected;
when the MCU unit detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, the MCU unit outputs a high-level signal to the MOS tube unit, the working circuit of the main control chip is conducted, the main control chip is powered, and the vehicle-mounted entertainment system is restarted;
the power supply management circuit further comprises a power supply conversion unit, the power supply conversion unit is connected with the MCU unit and the main control chip, and when the MCU unit detects that the vehicle ignition signal and the vehicle power supply signal are normal, the power supply conversion unit supplies power to the main control chip and restarts the vehicle entertainment system;
the signal control unit comprises a PNP triode and two voltage dividing resistors, wherein the input end of the PNP triode is connected with the intersection point of the connecting lines of the two voltage dividing resistors, the collector electrode of the PNP triode is connected with the control end of the MOS tube unit, and the emitter electrode of the PNP triode is grounded.
2. The power management circuit of the in-vehicle entertainment system according to claim 1, wherein the MOS transistor unit adopts a PMOS transistor.
3. The power management circuit of an in-vehicle entertainment system according to claim 1, wherein a fuse is further provided between the filter circuit and the power supply.
4. The power management circuit of an in-vehicle entertainment system of claim 1, wherein the filter circuit is an RC filter circuit.
5. The power management circuit of the in-vehicle entertainment system according to claim 1, further comprising a WIFI/BT chip, an EMMC memory chip, and an AVM module decoding chip, each connected to an output of the MOS transistor unit.
6. The power management circuit of the in-vehicle entertainment system according to claim 1, wherein the MOS transistor unit is a MOS transistor of a model RQ1a070 ZP.
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| CN202111444811.7A CN114362096B (en) | 2021-11-30 | 2021-11-30 | Power management circuit of vehicle-mounted entertainment system |
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| CN202111444811.7A CN114362096B (en) | 2021-11-30 | 2021-11-30 | Power management circuit of vehicle-mounted entertainment system |
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| CN114362096B true CN114362096B (en) | 2023-10-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11239837B2 (en) * | 2017-12-15 | 2022-02-01 | Rohm Co., Ltd. | Switch device |
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| CN104062928A (en) * | 2013-03-21 | 2014-09-24 | 陈言平 | Power supply circuit of electric vehicle controller |
| DE202015105461U1 (en) * | 2015-10-15 | 2016-01-20 | Champarts Electronic Technology Co., Ltd | Safety terminal system for emergency start of a vehicle battery |
| WO2016197984A1 (en) * | 2015-10-21 | 2016-12-15 | 中兴通讯股份有限公司 | Switch control circuit and method for terminal |
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