CN114362096A - Power supply management circuit of vehicle-mounted entertainment system - Google Patents
Power supply management circuit of vehicle-mounted entertainment system Download PDFInfo
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- CN114362096A CN114362096A CN202111444811.7A CN202111444811A CN114362096A CN 114362096 A CN114362096 A CN 114362096A CN 202111444811 A CN202111444811 A CN 202111444811A CN 114362096 A CN114362096 A CN 114362096A
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Abstract
The invention provides a power management circuit of a vehicle-mounted entertainment system, which comprises: the MCU unit, the MOS tube unit, the signal control unit, the main control chip and the filter circuit, wherein the input end of the MOS tube unit is connected with the 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 further 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 perform low-voltage protection, the main control chip is in a power-off state, a power supply is protected, when the MCU unit detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, power is supplied to the main control chip, and the vehicle-mounted entertainment system is restarted. Above-mentioned power management circuit of on-vehicle entertainment system through power protection circuit, avoids the power feed to appear, has solved among the prior art because lack reasonable circuit protection measure, leads to the whole car condition such as feed to appear easily, influences the life of power and causes the technical problem of not good user experience.
Description
Technical Field
The invention 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 thousands of households, and along with the development and progress of science and technology, the functions of the automobiles are more and more.
In the automobile industry, in order to enrich the functions of an entertainment system, increase the driving pleasure and provide intelligent travel service for users, the functions of the vehicle-mounted entertainment system are more and more complex, and the power distribution and management need to be reasonably designed. The vehicle-mounted entertainment system is a vehicle-mounted comprehensive information processing system formed by adopting a vehicle-mounted special central processing unit and based on a vehicle body bus system and internet services.
In the prior art, the whole functional modules are more and more, and due to the lack of reasonable circuit protection measures, the whole vehicle is easy to have the conditions of power feed and the like caused by the increase of the module power supply using requirements, so that the service life of a power supply is seriously influenced, and the user experience is not good.
Disclosure of Invention
Based on this, the invention 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 the service life of a power supply is seriously influenced and the user experience is not good due to the fact that the conditions of power feeding and the like easily occur in the whole vehicle because reasonable circuit protection measures are lacked in the prior art.
One aspect of the present invention provides a power management circuit for a vehicle-mounted entertainment system, comprising:
the power management circuit comprises an MCU unit, an MOS tube unit and a signal control unit which is connected with the MCU unit and the MOS tube unit, the power management circuit also comprises a main control chip and a filter circuit, 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 work 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 a 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 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, and a 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, switches on a working circuit of the main control chip, supplies power to the main control chip and restarts the vehicle-mounted entertainment system.
The power management circuit of the vehicle-mounted entertainment system avoids the situation of power feeding of the power supply through the power protection circuit, and specifically comprises an MCU unit, an MOS tube unit and a signal control unit, when the circuit voltage is lower than the protection threshold value of a reset chip, the reset chip is triggered to perform low-voltage protection, so that the main control chip is reset, 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 situations of power feeding and the like of the whole vehicle are avoided, and the service life of the power supply is prolonged; when the MCU unit detects that the vehicle sparking signal and the vehicle-mounted power supply signal are normal, the MCU unit outputs a high-level signal for the MOS tube unit, and the high-level signal is conducted to the working circuit of the main control chip and supplies power to the main control chip to restart the vehicle-mounted entertainment system, so that the service life of the power supply is prolonged, the vehicle-mounted entertainment system can be automatically restarted, the user experience is improved, the problems that the feed and the like easily occur in the whole vehicle due to the lack of reasonable circuit protection measures in the prior art are solved, and the service life of the power supply is seriously influenced and the technical problem of poor user experience is caused.
In addition, the power management circuit of the vehicle-mounted entertainment system according to the present invention may further have the following additional features:
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, when the MCU unit detects that the vehicle ignition signal and the vehicle-mounted power supply signal are both normal, the power conversion unit supplies power to the main control chip, and the vehicle-mounted entertainment system is restarted.
Furthermore, the MOS tube unit adopts a PMOS tube.
Furthermore, the signal control unit comprises a PNP type triode and two divider resistors, the input end of the PNP type triode is connected with the intersection point of the connecting lines of the two divider 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.
Furthermore, a fuse unit is further arranged between the filter circuit and the power supply, and the fuse unit is a fuse.
Further, the filter circuit is an RC filter circuit.
Furthermore, the power management circuit further comprises a WIFI/BT chip, an EMMC memory chip and an AVM module decoding chip which are respectively connected with the output end of the MOS tube unit.
Further, the MOS tube unit adopts an MOS tube with the model number of RQ1A070 ZP.
Drawings
FIG. 1 is a block diagram of a circuit connection system in an embodiment of the invention;
FIG. 2 is a block diagram of the circuit connection between the MOS transistor unit and the MCU unit according to the embodiment of the present invention;
fig. 3 is a detailed circuit connection diagram of the MOS transistor unit and the MCU unit in the embodiment of the present invention.
Description of the main element symbols:
| MOS |
100 | |
200 |
| |
300 | |
400 |
| |
500 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" 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 a vehicle-mounted entertainment system according to an embodiment of the present invention is shown, including:
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 capacitor in the RC filter circuit is 0.47 μ F, and the resistor is 10k Ω.
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 perform low-voltage protection, so that the main control chip resets, the main control chip outputs a low-level signal to the MCU unit 500, and 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, so that the main control chip is in a power-off state, and a power supply is protected;
when the MCU unit 500 detects that the vehicle ignition signal and the vehicle power signal are both normal, the MCU unit 500 outputs a high level signal to the MOS transistor unit 100, switches on the operating circuit of the main control chip, supplies power to the main control chip, and restarts the vehicle entertainment system.
As a specific example, the power management circuit further includes a power conversion unit, the power conversion unit is connected to 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 both normal, the power conversion unit supplies power to the main control chip to restart the vehicle-mounted entertainment system. Specifically, in the present embodiment, the output voltage of the power supply after being converted by the power conversion unit is 1.8v, 1.35v, and 1.1 v.
When the microcontroller MCU detects that BU _ DET/ACC _ DET are normal, the microcontroller MCU raises P _ ON 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 normally started, and the entertainment system is normally started up to work.
As a specific example, the power management circuit further includes a WIFI/BT chip, an EMMC memory chip, and an AVM module decoding chip respectively connected to the output terminal of the MOS transistor unit 100, specifically, a WIFI/BT IC, such as NF 33067; AVM decoding chips, such as Max 9288; EMMC, such as 32G; the power input DC of the circuit is 3.3V.
In the present embodiment, the MOS transistor unit 100 employs a PMOS transistor, and as a specific example, employs a MOS transistor with model number RQ1a070 ZP. The MOS tube is responsible for monitoring the current of the whole circuit, when the current is increased through the MOS tube, the voltage drop is increased and is lower than the reset chip protection threshold U monitored by the voltagemaxAnd triggering a Reset chip Reset IC to perform low-voltage protection, so that the SOC of the main control chip is Reset.
The MOS tube is connected with the MCU, the voltage monitoring Reset chip Reset IC, the WIFI/BT chip, the EMMC storage chip, the AVM module decoding chip, a plurality of resistors R and capacitors C required by the surrounding environment, and receives a DC3.3.V power supply of an entertainment system input ground.
In this embodiment, the signal control unit 300 includes a PNP type triode and two voltage-dividing resistors, the input terminal of the PNP type triode is connected to the intersection of the connection lines of the two voltage-dividing resistors, the collector of the PNP type triode is connected to the control terminal 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 10k Ω.
In the present embodiment, the RESET IC (detected voltage: U) in the loop is passedmin～U2) Monitoring the SOC for a normal 3.3V voltage, and if the SOC is found to be below U2The SOC system is hard-wired RESET by the RESET IC.
Through a switching tube MOS IC, the protection threshold U of the reset chip is lower than the voltage monitoring2The maximum current that does not drop to 3.111V is theoretically calculated as follows: i ismax＝(U1-U2)/RmosI.e. the circuit is designed to have a maximum current of ImaxWhen the current passing through the MOS IC of the switching tube is higher than ImaxWhen the system is RESET, the RESET IC is triggered to RESET the SOC system, and after the SOC system is RESET, the SOC is outputThe P _ OFF low level signal output by the IC is sent to the MCU, the MCU pulls the output P _ ON down to 0V 500ms after receiving the P _ OFF, the power of the SOC is cut OFF, the entertainment system is shut down, and the effect of protecting the system is achieved.
When the MCU detects that BU _ DET/ACC _ DET is normal, namely when the MCU unit 500 detects that the vehicle ignition signal and the vehicle-mounted power supply signal are normal, the set period is 200ms, P _ ON is pulled up to 3.3V, the SOC is normally started, and the entertainment system is normally started.
The protection logic of the power management circuit in the scheme of the application is as follows:
the MOS of the switching tube is responsible for monitoring the current of the whole circuit, and when the current is increased through the MOS of the switching tube, the voltage drop is increased and is lower than the reset chip protection threshold U of voltage monitoringmaxTriggering the RESET IC low-voltage protection to cause the main control chip SOC to RESET; the P _ OFF low level signal output by the main control chip SOC is sent to the microcontroller MCU, the microcontroller MCU pulls down the output P _ ON to 0V within 500ms after receiving the P _ OFF signal, the power supply of the main control chip SOC is cut OFF, the entertainment system is shut down, and the effect of protecting the system is achieved.
In summary, in the power management circuit of the vehicle-mounted entertainment system in the above embodiment of the present invention, the power supply protection circuit is used to avoid the power feeding situation of the power supply, specifically, the MCU unit, the MOS transistor unit and the signal control unit are provided, when the circuit voltage is lower than the protection threshold of the reset chip, the reset chip is triggered to perform 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 transistor unit to be disconnected, so that the main control chip is in a power-off state, protects the power supply, avoids the feeding situation of the entire vehicle, and prolongs the service life of the power supply; when the MCU unit detects that the vehicle sparking signal and the vehicle-mounted power supply signal are normal, the MCU unit outputs a high-level signal for the MOS tube unit, and the high-level signal is conducted to the working circuit of the main control chip and supplies power to the main control chip to restart the vehicle-mounted entertainment system, so that the service life of the power supply is prolonged, the vehicle-mounted entertainment system can be automatically restarted, the user experience is improved, the problems that the feed and the like easily occur in the whole vehicle due to the lack of reasonable circuit protection measures in the prior art are solved, and the service life of the power supply is seriously influenced and the technical problem of poor user experience is caused.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement 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 could even be paper or another suitable medium upon which the program is printed, as the program can 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 should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A power management circuit for an in-vehicle entertainment system, comprising:
the power management circuit comprises an MCU unit, an MOS tube unit and a signal control unit which is connected with the MCU unit and the MOS tube unit, the power management circuit also comprises a main control chip and a filter circuit, 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 work 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 a 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 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, and a 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, switches on a working circuit of the main control chip, supplies power to the main control chip and restarts the vehicle-mounted entertainment system.
2. The power management circuit of the vehicle-mounted entertainment system of claim 1, further comprising a power conversion unit, wherein the power conversion unit is connected to the MCU unit and the main control chip, and when the MCU unit detects that both the vehicle ignition signal and the vehicle-mounted power signal are normal, the power conversion unit supplies power to the main control chip to restart the vehicle-mounted entertainment system.
3. The power management circuit of the in-vehicle entertainment system of claim 1, wherein the MOS transistor unit is a PMOS transistor.
4. The power management circuit of claim 1, wherein the signal control unit comprises a PNP type transistor and two voltage dividing resistors, an input terminal of the PNP type transistor is connected to an intersection of connecting lines of the two voltage dividing resistors, a collector terminal of the PNP type transistor is connected to the control terminal of the MOS transistor unit, and an emitter terminal of the PNP type transistor is grounded.
5. The power management circuit of the in-vehicle entertainment system of claim 1, wherein a fuse unit is further disposed between the filter circuit and the power supply, and the fuse unit is a fuse.
6. The power management circuit of an in-vehicle entertainment system of claim 1, wherein the filter circuit is an RC filter circuit.
7. The power management circuit of the in-vehicle entertainment system of claim 1, further comprising a WIFI/BT chip, an EMMC memory chip and an AVM module decoding chip respectively connected to the output terminals of the MOS transistor units.
8. The power management circuit of the in-vehicle entertainment system of claim 1, wherein the MOS transistor unit is an MOS transistor with model number 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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| CN114362096A true CN114362096A (en) | 2022-04-15 |
| CN114362096B CN114362096B (en) | 2023-10-17 |
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| 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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| CN114362096B (en) | 2023-10-17 |
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