CN212195348U - Power management circuit for on-off of vehicle-mounted equipment - Google Patents
Power management circuit for on-off of vehicle-mounted equipment Download PDFInfo
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- CN212195348U CN212195348U CN202020611671.2U CN202020611671U CN212195348U CN 212195348 U CN212195348 U CN 212195348U CN 202020611671 U CN202020611671 U CN 202020611671U CN 212195348 U CN212195348 U CN 212195348U
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Abstract
The utility model discloses a power supply management circuit for on-board equipment, which comprises a signal detection module, a main control module and an output control module, wherein the main control module and the output control module are respectively electrically connected with the signal detection module; the output control module is also respectively connected with the main control module, the vehicle-mounted equipment and a system power supply for supplying power to the vehicle-mounted equipment; the signal detection module is used for detecting a starting signal and a shutdown signal of the vehicle-mounted equipment and feeding the signals back to the main control module and the output control module, and the output control module is used for controlling a system power supply to supply power to the main control module after receiving the starting signal; and the main control module is used for controlling the on-off of the power supply of the vehicle-mounted equipment from the power supply of the main control system through the output control module without being interfered by a shutdown signal after the power supply is powered on. The utility model discloses can realize under the condition of no singlechip, the break-make of autonomic control system power to the mobile unit power supply further does not influence the mobile unit and normally works, reasonable in design, principle are simple, with low costs, the practicality is strong.
Description
Technical Field
The utility model relates to a mobile unit power management technical field especially relates to a mobile unit switching on and shutting down power management circuit.
Background
In the vehicle-mounted monitoring storage device, when the storage device is in a read-write state, the power supply can stably supply power to the storage device. Therefore, the storage device cannot be powered off suddenly when working, the storage device can be powered off only when the storage device stops reading and writing and is in an idle state, and otherwise various faults are easy to occur. Most of the existing circuits for managing the power supply of the vehicle-mounted monitoring equipment need a single chip microcomputer, the problem of instantaneous power failure is solved through the single chip microcomputer, and the defects of high cost, complex circuit and unstable system exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a mobile unit switching on and shutting down power management circuit, this circuit controls when cutting off the power supply in the twinkling of an eye to the mobile unit through host system and output control module, realizes under the condition of no singlechip, and the break-make of autonomic control system power to the mobile unit power supply further does not influence the mobile unit and normally works, reasonable in design, the principle is simple, with low costs, the practicality is strong.
In order to realize the purpose, the following technical scheme is adopted:
a power supply management circuit for on-off of vehicle-mounted equipment comprises a signal detection module, a main control module and an output control module, wherein the main control module and the output control module are respectively electrically connected with the signal detection module; the output control module is also respectively connected with the main control module, the vehicle-mounted equipment and a system power supply for supplying power to the vehicle-mounted equipment; the signal detection module is used for detecting a starting signal and a shutdown signal of the vehicle-mounted equipment and feeding the signals back to the main control module and the output control module, and the output control module is used for controlling a system power supply to supply power to the main control module after receiving the starting signal; and the main control module is used for controlling the on-off of the power supply of the vehicle-mounted equipment from the power supply of the main control system through the output control module without being interfered by a shutdown signal after the power supply is powered on.
Further, the signal detection module comprises a first comparator U20-A, a second comparator U20-B, a voltage division resistor R163 and a voltage division resistor R164; the non-inverting input end of the first comparator U20-A is connected with the non-inverting input end of the second comparator U20-B, the inverting input end of the first comparator U20-A is used for receiving a starting signal and a shutdown signal of the vehicle-mounted equipment through the voltage dividing resistor R163, and the output end of the first comparator U20-A is used for being connected with the main control module; the inverting input end of the second comparator U20-B is connected to the common connection end of the first comparator U20-A and the voltage dividing resistor R163 and is grounded through the voltage dividing resistor R164, and the output end of the second comparator U20-B is used for being connected with the output control module.
Further, the output control module comprises a field effect transistor Q9, a transistor Q13, a transistor Q15, a transistor Q17; the field effect transistor Q9 is respectively connected with a system power supply, the output end of the second comparator U20-B and the vehicle-mounted equipment; the base electrode of the transistor Q17 and the base electrode of the transistor Q15 are both connected with the main control module, the emitter electrode of the transistor Q17 is connected with the collector electrode of the transistor Q15, and the emitter electrode of the transistor Q15 is grounded; the base of the transistor Q13 is connected to the common connection end of the transistor Q17 and the transistor Q15, the collector of the transistor Q13 is connected to the common connection end of the output end of the second comparator U20-B and the field effect transistor Q9, and the emitter of the transistor Q13 is grounded.
Further, the output control module further comprises a current limiting resistor R96, a current limiting resistor R132, and a current limiting resistor R56; the base of the transistor Q17 and the base of the transistor Q15 are respectively connected with the main control module through a current-limiting resistor R132 and a current-limiting resistor R96, and the base of the transistor Q13 is connected with the common connection end of the transistor Q17 and the transistor Q15 through a current-limiting resistor R56.
Further, the main control module includes a power management chip, which is of a type HI3520DV 300.
Adopt above-mentioned scheme, the beneficial effects of the utility model are that:
through master control module and output control module to the mobile unit when cutting off the power supply in the twinkling of an eye, realize under the condition of no singlechip, the break-make of autonomic control system power supply to the mobile unit power supply, and then do not influence the mobile unit and normally work, reasonable in design, principle are simple, with low costs, the practicality is strong.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a circuit diagram of an output control module according to the present invention;
fig. 3 is a circuit diagram of the signal detection module of the present invention;
wherein the figures identify the description:
1-a signal detection module; 2, a main control module;
3-an output control module; 4-system power supply;
5-vehicle-mounted equipment.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3, the utility model provides a power management circuit for on-board equipment, which comprises a signal detection module 1, a main control module 2 and an output control module 3, wherein the main control module 2 and the output control module are respectively electrically connected with the signal detection module 1; the output control module 3 is also respectively connected with the main control module 2, the vehicle-mounted equipment 5 and a system power supply 4 for supplying power to the vehicle-mounted equipment 5; the signal detection module 1 is used for detecting a starting signal and a shutdown signal of the vehicle-mounted device 5 and feeding the signals back to the main control module 2 and the output control module 3, and the output control module 3 is used for controlling the system power supply 4 to supply power to the main control module 2 after receiving the starting signal; the main control module 2 is used for automatically controlling the on-off of the power supply of the vehicle-mounted equipment 5 by the system power supply 4 through the output control module 3 without being interfered by a shutdown signal after being electrified.
The signal detection module 1 comprises a first comparator U20-A, a second comparator U20-B, a voltage division resistor R163 and a voltage division resistor R164; the non-inverting input end of the first comparator U20-A is connected with the non-inverting input end of the second comparator U20-B, the inverting input end of the first comparator U20-A is used for receiving a starting signal and a shutdown signal of the vehicle-mounted equipment 5 through the voltage dividing resistor R163, and the output end of the first comparator U20-A is used for being connected with the main control module 2; the inverting input end of the second comparator U20-B is connected to the common connection end of the first comparator U20-A and the voltage dividing resistor R163 and is grounded through the voltage dividing resistor R164, and the output end of the second comparator U20-B is used for being connected with the output control module 3; the output control module 3 comprises a field effect transistor Q9, a transistor Q13, a transistor Q15 and a transistor Q17; the field effect transistor Q9 is respectively connected with the system power supply 4, the output end of the second comparator U20-B and the vehicle-mounted equipment 5; the base electrode of the transistor Q17 and the base electrode of the transistor Q15 are both connected with the main control module 2, the emitter electrode of the transistor Q17 is connected with the collector electrode of the transistor Q15, and the emitter electrode of the transistor Q15 is grounded; the base electrode of the transistor Q13 is connected to the common connection end of the transistor Q17 and the transistor Q15, the collector electrode of the transistor Q13 is connected to the common connection end of the output end of the second comparator U20-B and the field effect transistor Q9, and the emitter electrode of the transistor Q13 is grounded; the output control module 3 further comprises a current limiting resistor R96, a current limiting resistor R132 and a current limiting resistor R56; the base electrode of the transistor Q17 and the base electrode of the transistor Q15 are respectively connected with the main control module 2 through a current-limiting resistor R132 and a current-limiting resistor R96, and the base electrode of the transistor Q13 is connected with the common connecting end of the transistor Q17 and the transistor Q15 through a current-limiting resistor R56; the main control module 2 comprises a power management chip, and the type of the power management chip is HI3520DV 300.
The utility model discloses the theory of operation:
with reference to fig. 1 to 3, in this embodiment, the signal detection module 1 is responsible for collecting a power-on signal and a power-off signal of the vehicle-mounted device 5, the main control module 2 performs autonomous maintenance and autonomous power-off control on the energization of the vehicle-mounted device 5 through the output control module 3, if the signal detection module 1 detects the power-off signal, the main control module 2 performs maintenance control on the output control module 3 at first, and when the main control module 2 completes its own work and allows power off, the output control module 3 gives up the autonomous maintenance, and at this time, the output control module 3 cuts off the power supply of the system power supply 4 to the vehicle-mounted device 5, so as to achieve the purpose of protecting the vehicle-mounted device 5 (system); by the technical scheme, reliable on-off control can be firstly carried out on the vehicle-mounted equipment 5, and the situation that the vehicle-mounted equipment 5 cannot normally complete work due to instant power failure is avoided; secondly, a single chip microcomputer chip is not used, and the purpose of reducing the cost is further achieved; finally, the circuit scheme can reduce the area of the power management circuit and achieve the aim of miniaturization.
Specifically, when the vehicle-mounted device 5 is started, after the signal detection module 1 detects a power-on signal (the network name is ACC _ IN, and at this time, ACC _ IN is at a high level), the signal detection module 1 outputs a signal (the network name is ACC _ CHK, and at this time, ACC _ CHK is at a low level) to the main control module 2, and simultaneously outputs a signal (the network name is ACC _ CTRL, and at this time, ACC _ CTRL is at a low level) to the output control module 3, and at this time, the fet Q9 of the output control module 3 is forcibly turned on, and outputs a voltage to the main control module 2 for powering on; after the main control module 2 is powered on, the main control module controls to output a first holding control signal (network name PWR _ EN1) to output a high level, turn on the transistor Q17, and simultaneously controls to output a second holding control signal (network name PWR _ EN2) to output a low level, and turn off the transistor Q15, at this time, the transistor Q13 is turned on, ACC _ CTRL is a low level, at this time, the fet Q9 is in an on state, the fet Q34 is in an off state, and the network name VOUT _12V outputs 12V voltage to the vehicle-mounted device 5, so that the power supply of the system power supply 4 is realized.
When the vehicle-mounted device 5 is turned off and the main control module 2 does not output a shutdown permission, the signal detection module 1 detects a shutdown signal (ACC _ IN is a low level), the signal detection module 1 outputs (ACC _ CHK is a high level) a signal to the main control module 2, at this time, because the first and second outputs of the main control module 2 keep the control state of the control signal unchanged (PWR _ EN1 is a high level and PWR _ EN2 is a low level), ACC _ CTRL is still pulled to a low level, and the fet Q9 is still IN an open state, at this time, the purpose of power-off maintenance is achieved.
When the vehicle-mounted device 5 is turned off and the main control module 2 outputs a shutdown permission, at this time, the main control module 2 controls the PWR _ EN1 to output a low level, so as to turn off the transistor Q17, and at the same time, controls the PWR _ EN2 to output a high level, turns on the transistor Q15, at this time, the transistor Q13 is turned off, the ACC _ CTRL is pulled to a high level by the pull-up resistor R11, at this time, the fet Q9 is in a closed state, the fet Q34 is in an open state, and the system power supply 4 is powered off, at this time, since the fet Q34 is turned on, the network name VOUT _12V discharges to the ground through the R280 resistor, and thus the purpose of quickly turning off the system power supply 4 is achieved, so as to ensure.
The above are only preferred embodiments of the present invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A power supply management circuit for on-off of vehicle-mounted equipment is characterized by comprising a signal detection module, a main control module and an output control module, wherein the main control module and the output control module are respectively electrically connected with the signal detection module; the output control module is also respectively connected with the main control module, the vehicle-mounted equipment and a system power supply for supplying power to the vehicle-mounted equipment; the signal detection module is used for detecting a starting signal and a shutdown signal of the vehicle-mounted equipment and feeding the signals back to the main control module and the output control module, and the output control module is used for controlling a system power supply to supply power to the main control module after receiving the starting signal; and the main control module is used for controlling the on-off of the power supply of the vehicle-mounted equipment from the power supply of the main control system through the output control module without being interfered by a shutdown signal after the power supply is powered on.
2. The on-off power management circuit of the vehicle-mounted device according to claim 1, wherein the signal detection module comprises a first comparator U20-A, a second comparator U20-B, a voltage-dividing resistor R163 and a voltage-dividing resistor R164; the non-inverting input end of the first comparator U20-A is connected with the non-inverting input end of the second comparator U20-B, the inverting input end of the first comparator U20-A is used for receiving a starting signal and a shutdown signal of the vehicle-mounted equipment through the voltage dividing resistor R163, and the output end of the first comparator U20-A is used for being connected with the main control module; the inverting input end of the second comparator U20-B is connected to the common connection end of the first comparator U20-A and the voltage dividing resistor R163 and is grounded through the voltage dividing resistor R164, and the output end of the second comparator U20-B is used for being connected with the output control module.
3. The on-board unit power management circuit according to claim 2, wherein the output control module comprises a field effect transistor Q9, a transistor Q13, a transistor Q15, a transistor Q17; the field effect transistor Q9 is respectively connected with a system power supply, the output end of the second comparator U20-B and the vehicle-mounted equipment; the base electrode of the transistor Q17 and the base electrode of the transistor Q15 are both connected with the main control module, the emitter electrode of the transistor Q17 is connected with the collector electrode of the transistor Q15, and the emitter electrode of the transistor Q15 is grounded; the base of the transistor Q13 is connected to the common connection end of the transistor Q17 and the transistor Q15, the collector of the transistor Q13 is connected to the common connection end of the output end of the second comparator U20-B and the field effect transistor Q9, and the emitter of the transistor Q13 is grounded.
4. The on-board power supply management circuit according to claim 3, wherein the output control module further comprises a current limiting resistor R96, a current limiting resistor R132, a current limiting resistor R56; the base of the transistor Q17 and the base of the transistor Q15 are respectively connected with the main control module through a current-limiting resistor R132 and a current-limiting resistor R96, and the base of the transistor Q13 is connected with the common connection end of the transistor Q17 and the transistor Q15 through a current-limiting resistor R56.
5. The on-off power management circuit of the vehicle-mounted device according to claim 4, wherein the main control module comprises a power management chip of type HI3520DV 300.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020611671.2U CN212195348U (en) | 2020-04-21 | 2020-04-21 | Power management circuit for on-off of vehicle-mounted equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020611671.2U CN212195348U (en) | 2020-04-21 | 2020-04-21 | Power management circuit for on-off of vehicle-mounted equipment |
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| Publication Number | Publication Date |
|---|---|
| CN212195348U true CN212195348U (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020611671.2U Active CN212195348U (en) | 2020-04-21 | 2020-04-21 | Power management circuit for on-off of vehicle-mounted equipment |
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| Country | Link |
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| CN (1) | CN212195348U (en) |
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- 2020-04-21 CN CN202020611671.2U patent/CN212195348U/en active Active
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