CN211606187U - Vehicle-mounted electronic equipment power-down protection circuit and automobile - Google Patents
Vehicle-mounted electronic equipment power-down protection circuit and automobile Download PDFInfo
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- CN211606187U CN211606187U CN202020460050.9U CN202020460050U CN211606187U CN 211606187 U CN211606187 U CN 211606187U CN 202020460050 U CN202020460050 U CN 202020460050U CN 211606187 U CN211606187 U CN 211606187U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 5
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The utility model discloses a vehicle-mounted electronic equipment power-down protection circuit, include: voltage detection unit and electric power storage discharge unit of output car mains voltage signal, wherein: the input end of the voltage detection unit is electrically connected with an automobile power supply, the first output end of the voltage detection unit is in communication connection with the control end of the vehicle-mounted electronic equipment, and the second output end of the voltage detection unit is electrically connected with the power supply end of the vehicle-mounted electronic equipment; the input end of the electric power storage and discharge unit is electrically connected with an automobile power supply, and the output end of the electric power storage and discharge unit is electrically connected with the power supply end of the vehicle-mounted electronic equipment. The utility model also discloses an automobile. The utility model discloses a storage discharge unit, replace to use the lithium cell as the stand-by power supply of on-vehicle electronic equipment; and a voltage detection circuit is added, and when the power failure risk is found, the vehicle-mounted electronic equipment is immediately informed to store the key data.
Description
Technical Field
The utility model relates to a car correlation technique field, especially a vehicle-mounted electronic equipment power-down protection circuit, car.
Background
When the automobile runs, accidents such as collision can cause the vehicle-mounted electronic equipment, such as a vehicle event data recorder, to be suddenly powered off, and collision videos cannot be stored in time. When the oil-electricity hybrid automobile is unstable in power supply and the power supply voltage fluctuates greatly, the vehicle-mounted electronic equipment such as a vehicle event data recorder is powered off suddenly, and the stored data is incomplete.
The conventional power supply method for the vehicle-mounted electronic device is as follows:
a) the vehicle-mounted electronic equipment is connected to a temporary power supply of the vehicle without a battery, and is in a shutdown state immediately after losing the power supply with the flameout of the vehicle.
b) And (4) connecting the rear-mounted vehicle-mounted electronic equipment to the normal power of the vehicle without adding a battery, wherein the rear-mounted vehicle-mounted electronic equipment still has power when the vehicle is flamed out.
c) The device is additionally provided with a battery, the vehicle-mounted electronic device is connected to a temporary power supply of the vehicle, and the battery continues to supply power to keep the basic functions of the vehicle-mounted electronic device after the vehicle is flamed out.
The prior art has the following defects:
a) the vehicle-mounted electronic equipment is connected to a temporary power supply of the vehicle, and the vehicle-mounted electronic equipment loses the power supply after the vehicle is flamed out, so that not only are all functions invalid, but also a lot of data which are not stored in time are lost along with complete power failure, and meanwhile, the data storage integrity when abnormal conditions such as collision and the like occur cannot be guaranteed.
b) The rear-mounted vehicle-mounted electronic equipment is connected to the normal power of the vehicle, data can still be stored continuously after flameout, but the data storage integrity when abnormal conditions such as collision occur cannot be guaranteed.
c) The reliability, safety, cost, etc. of a battery installed in a rear-mounted vehicle-mounted electronic device are all significant problems. The vehicle-mounted electronic equipment has complex use conditions, such as unavoidable bumping in the driving process, seasonal extreme working temperature and the like, and has higher requirements on the reliability and safety of the battery. In order to ensure safety and reliability, a vehicle-specific battery must be used at a sacrifice in cost.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a power-down protection circuit for vehicle-mounted electronic equipment, aiming at the technical problem that the prior art cannot well perform power-down protection on the vehicle-mounted electronic equipment.
The utility model provides a power-down protection circuit for vehicle-mounted electronic equipment, include: voltage detection unit and electric power storage discharge unit of output car mains voltage signal, wherein:
the input end of the voltage detection unit is electrically connected with an automobile power supply, the first output end of the voltage detection unit is in communication connection with the control end of the vehicle-mounted electronic equipment, and the second output end of the voltage detection unit is electrically connected with the power supply end of the vehicle-mounted electronic equipment;
the input end of the electric power storage and discharge unit is electrically connected with an automobile power supply, and the output end of the electric power storage and discharge unit is electrically connected with the power supply end of the vehicle-mounted electronic equipment.
Further, the voltage detection unit includes: the input end of the voltage detection unit is electrically connected with the first voltage-dividing resistor and the second voltage-dividing resistor in sequence and then grounded, the connection point of the first voltage-dividing resistor and the second voltage-dividing resistor is the first output end, and the input end of the voltage detection unit is also electrically connected with the second output end.
Furthermore, the voltage detection unit further comprises a reverse charging prevention module, and the input end of the voltage detection unit is electrically connected with the second output end through the reverse charging prevention module.
Still further, the anti-reverse charging module includes a first controllable switch and a second controllable switch, two ends of the first controllable switch are electrically connected to the input end of the voltage detection unit and the second output end respectively, a control end of the first controllable switch is electrically connected to one end of the second controllable switch, the other end of the second controllable switch is grounded, a control end of the second controllable switch is electrically connected to the input end of the voltage detection unit, when the control end of the first controllable switch is at a low level, two ends of the first controllable switch are turned on, when the control end of the first controllable switch is at a high level, two ends of the first controllable switch are turned off, when the control end of the second controllable switch is at a high level, two ends of the second controllable switch are turned on, and when the control end of the second controllable switch is at a low level, and two ends of the second controllable switch are cut off.
Further, the electricity storage discharge unit includes: the charging current-limiting resistor, the super capacitor and the third controllable switch are arranged on the power storage discharging unit, the input end of the power storage discharging unit is electrically connected with the first end of the super capacitor through the charging current-limiting resistor, the second end of the super capacitor is grounded, the two ends of the third controllable switch are respectively electrically connected with the first end of the super capacitor and the output end of the power storage discharging unit, the control end of the third controllable switch is electrically connected with the input end of the voltage detection unit, when the control end of the third controllable switch is at a high level, the two ends of the third controllable switch are cut off, and when the control end of the third controllable switch is at a low level, the two ends of the third controllable switch are switched on.
Furthermore, the electric power storage discharging unit further comprises an anti-reverse diode, and the input end of the electric power storage discharging unit is electrically connected with the charging current-limiting resistor through the anti-reverse diode.
Further, the automobile power supply further comprises a first voltage reduction unit, and the automobile power supply is electrically connected with the input end of the voltage detection unit through the first voltage reduction unit.
Furthermore, the first voltage reduction unit comprises a first switch-mode voltage regulator, an input end of the first switch-mode voltage regulator is electrically connected with the automobile power supply, and an output end of the first switch-mode voltage regulator is electrically connected with an input end of the voltage detection unit.
Still further, the automobile power supply further comprises a second voltage reduction unit, and the automobile power supply is electrically connected with the input end of the electric power storage discharge unit through the second voltage reduction unit.
Still further, the second voltage reduction unit includes a second switch-mode voltage regulator, an input terminal of the second switch-mode voltage regulator is electrically connected to the vehicle power supply, and an output terminal of the second switch-mode voltage regulator is electrically connected to an input terminal of the electricity storage discharge unit.
The utility model also provides an automobile that adopts above-mentioned circuit.
The utility model discloses a storage discharge unit, replace to use the lithium cell as the stand-by power supply of on-vehicle electronic equipment; and a voltage detection circuit is added, and when the power failure risk is found, the vehicle-mounted electronic equipment is immediately informed to store the key data.
Drawings
Fig. 1 is a schematic circuit diagram of a power-down protection circuit of a vehicle-mounted electronic device according to the present invention;
FIG. 2 is a schematic diagram of a voltage detection unit of a power down protection circuit for a vehicle-mounted electronic device according to the present invention;
FIG. 3 is a schematic diagram of a power storage and discharge unit of a power down protection circuit for a vehicle-mounted electronic device according to the present invention;
fig. 4 is a schematic diagram of a first voltage reduction unit circuit of the power down protection circuit of the vehicle-mounted electronic device of the present invention;
fig. 5 is the utility model relates to a vehicle-mounted electronic equipment power down protection circuit's second step-down unit circuit schematic diagram.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
As shown in fig. 1, the utility model relates to a power down protection circuit for vehicle-mounted electronic equipment, include: voltage detection unit 1 and electric power storage discharge unit 2 of output car mains voltage signal, wherein:
an input end VSYS _4V of the voltage detection unit 1 is electrically connected with an automobile power supply 6, a first output end of the voltage detection unit 1 is in communication connection with a control end of the vehicle-mounted electronic device 5, and a second output end of the voltage detection unit 1 is electrically connected with a power supply end SYS _ PWR of the vehicle-mounted electronic device 5;
an input end VBUS _5V of the electric storage and discharge unit 2 is electrically connected with an automobile power supply 6, and an output end of the electric storage and discharge unit 2 is electrically connected with a power supply end SYS _ PWR of the vehicle-mounted electronic device 5.
Specifically, the onboard electronic device 5 is preferably an onboard recorder. The automobile power supply 6 can be an automobile battery power supply VIN _ 12V.
The voltage detection unit 1 is mainly used for detecting the automobile power supply 6, outputting a power supply signal to the control end of the vehicle-mounted electronic equipment 5 through the first output end when detecting that the automobile power supply 6 supplies power, and outputting a power failure signal to the control end of the vehicle-mounted electronic equipment 5 through the first output end when detecting that the automobile power supply 6 loses power. Meanwhile, the second output terminal of the voltage detection unit 1 is electrically connected to a power supply terminal SYS _ PWR of the on-board electronic device 5, and supplies power to the on-board electronic device 5 when the vehicle power supply 6 supplies power.
The electric power storage and discharge unit 2 stores electric energy of the vehicle power supply 6 when the vehicle power supply 6 supplies power, and releases the stored electric energy to supply power to a power supply terminal SYS _ PWR of the vehicle-mounted electronic device 5 as a backup power supply of the vehicle-mounted electronic device 5 when the vehicle power supply 6 is powered off.
The utility model discloses a storage discharge unit, replace to use the lithium cell as the stand-by power supply of on-vehicle electronic equipment; and a voltage detection circuit is added, and when the power failure risk is found, the vehicle-mounted electronic equipment is immediately informed to store the key data.
Example two
As shown in fig. 1 to 5, an embodiment of the present invention provides a power down protection circuit for vehicle-mounted electronic device, including: voltage detection unit 1, electric power storage discharge unit 2, first voltage reduction unit 3 and second voltage reduction unit 4 of output car mains voltage signal, wherein:
the automobile power supply 6 is electrically connected with an input end VSYS _4V of the voltage detection unit 1 through the first voltage reduction unit 3, a first output end of the voltage detection unit 1 is in communication connection with a control end of the vehicle-mounted electronic device 5, and a second output end of the voltage detection unit 1 is electrically connected with a power supply end SYS _ PWR of the vehicle-mounted electronic device 5;
the vehicle power supply 6 is electrically connected to the input end VBUS _5V of the electric storage discharge unit 2 through the second voltage reduction unit 4, and the output end of the electric storage discharge unit 2 is electrically connected to the power supply end SYS _ PWR of the vehicle-mounted electronic device 5, wherein:
as shown in fig. 2, the voltage detection unit 1 includes: the voltage detection circuit comprises a first voltage-dividing resistor R1, a second voltage-dividing resistor R3 and an anti-reverse charging module 11, wherein an input end VSYS _4V of the voltage detection unit 1 is electrically connected with the first voltage-dividing resistor R1 and the second voltage-dividing resistor R3 in sequence and then grounded, a connection point of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R3 is a first output end, and an input end VSYS _4V of the voltage detection unit 1 is electrically connected with a second output end through the anti-reverse charging module 11;
the anti-reverse charging module 11 comprises a first controllable switch Q1 and a second controllable switch Q2, wherein two ends of the first controllable switch Q1 are electrically connected with the input end VSYS _4V of the voltage detection unit 1 and the second output end respectively, the control end of the first controllable switch Q1 is electrically connected with one end of the second controllable switch Q2, the other end of the second controllable switch Q2 is grounded, the control end of the second controllable switch Q2 is electrically connected with the input end VSYS _4V of the voltage detection unit 1, when the control end of the first controllable switch Q1 is at a low level, two ends of the first controllable switch Q1 are turned on, when the control end of the first controllable switch Q1 is at a high level, two ends of the first controllable switch Q1 are turned off, when the control end of the second controllable switch Q2 is at a high level, two ends of the second controllable switch Q2 are turned on, when the control end of the second controllable switch Q2 is at low level, the two ends of the second controllable switch Q2 are cut off;
preferably, the voltage detection unit 1 further comprises a resistor R2, a resistor R4 and a capacitor C1, the input terminal VSYS _4V of the voltage detection unit 1 is electrically connected with the control terminal of the second controllable switch Q2 through the resistor R4, and the resistor R2 and the capacitor C1 are arranged in parallel at the output terminal of the voltage detection unit 1;
as shown in fig. 3, the electricity storage discharge unit 2 includes: an anti-reverse diode D1, a charging current-limiting resistor R5, a super capacitor C4, and a third controllable switch Q3, wherein VBUS _5V of the input end of the electric power storage and discharge unit 2 sequentially passes through the anti-reverse diode D1, the charging current-limiting resistor R5 and the first end of the super capacitor C4, the second end of the super capacitor C4 is grounded, two ends of the third controllable switch Q3 are respectively electrically connected with the first end of the super capacitor C4 and the output end of the electric power storage and discharge unit 2, the control end of the third controllable switch Q3 is electrically connected with the input end VSYS _4V of the voltage detection unit 1, when the control end of the third controllable switch Q3 is at a high level, two ends of the third controllable switch Q3 are turned off, and when the control end of the third controllable switch Q3 is at a low level, two ends of the third controllable switch Q3 are turned on;
preferably, the power storage and discharge unit 2 further includes a resistor R6 and a resistor R7;
as shown in fig. 4, the first voltage reduction unit 3 comprises a first switch-mode voltage regulator DCDC1, an input terminal of the first switch-mode voltage regulator DCDC1 is electrically connected with the vehicle power supply 6, an output terminal of the first switch-mode voltage regulator DCDC1 is electrically connected with an input terminal VSYS _4V of the voltage detection unit 1, and the vehicle power supply 6 is preferably a vehicle battery voltage VIN _ 12V;
as shown in fig. 5, the second voltage reduction unit 4 includes a second switch-mode voltage regulator DCDC2, an input terminal of the second switch-mode voltage regulator DCDC2 is electrically connected to the vehicle power supply 6, an output terminal of the second switch-mode voltage regulator DCDC2 is electrically connected to the input terminal VBUS _5V of the electricity storage discharge unit 2, the voltage regulated by the second switch-mode voltage regulator DCDC2 is higher than the voltage regulated by the first switch-mode voltage regulator DCDC1, and the vehicle power supply 6 is preferably a vehicle battery voltage VIN _ 12V.
Specifically, the onboard electronic device 5 is preferably an onboard recorder, and the vehicle power supply 6 is preferably a vehicle battery voltage VIN — 12V.
Super capacitor: farad capacitance, an electrochemical element that stores energy through polarized electrolyte. Compared with a lithium battery, the lithium battery has the advantages of safety, reliability, high charging speed, long cycle service life, super strong heavy current discharging capability, simple charging and discharging circuit and the like.
The first controllable switch Q1, the second controllable switch Q2 and the third controllable switch Q3 are preferably MOS transistors. A MOS transistor, i.e., a field effect transistor, is an electronic component that controls current by voltage, and functions as a variable resistor in a circuit.
The switch mode voltage regulator utilizes MOS pipe, inductance and electric capacity to realize high-efficient power conversion.
The power-down protection circuit is mainly used for reducing the voltage VIN _12V of the automobile battery through a first switch mode voltage regulator DCDC1 and a second switch mode voltage regulator DCDC2 and then providing a power supply for a later stage, wherein a first controllable switch Q1 realized by adopting an MOS (metal oxide semiconductor) tube is additionally arranged behind the DCDC1 and provides a 4V main power supply SYS _ PWR for a system, and the Q1 plays a role of preventing reverse discharge of a capacitor at the same time; the second switch-mode voltage regulator DCDC2 provides a 5V power supply VBUS _5V for peripherals such as cameras and the like, and also serves as a charging power supply for the super capacitor C4. The charging power supply of the super capacitor C4 selects a voltage which is higher than the main power supply of the system properly, and the capacity of the capacitor can be fully utilized.
The anti-reverse diode D1 and the charging current-limiting resistor R5 form a charging loop of the super capacitor C4, wherein the anti-reverse diode D1 is used for preventing the capacitor from discharging reversely, and the charging current-limiting resistor R5 is used for charging and limiting current; the third controllable switch Q3 is a discharge loop switch of the super capacitor C4. When VIN _12V is normal, VSYS _4V normally outputs, a general input/output pin GPIO1 is used as a first output end of the voltage detection unit 1 to output high level, a first controllable switch Q1 is turned on, a third controllable switch Q3 is turned off, a system main power supply SYS _ PWR is supplied from VSYS _4V, and a super capacitor C4 is only charged and is not discharged; when VIN12 is powered off, VSYS _4V output is 0, GPIO1 outputs low level, Q1 is turned off, Q3 is turned on, and super capacitor C4 starts to discharge to provide main power for the system. And a capacitor with proper capacity is selected, so that the system can continue to work for several seconds after the equipment is powered off, and key data are guaranteed to be stored.
When the VIN12 fluctuates instead of being really powered down, false power failure alarm may occur in the detection of the GPIO1, and the influence of the fluctuation can be filtered by an algorithm, so that misoperation of the system is avoided.
The embodiment is that vehicle-mounted electronic equipment, such as a vehicle event data recorder, adds a super capacitor, and under the condition of abnormal power failure of the vehicle-mounted electronic equipment, the super capacitor serves as a temporary power supply of the vehicle-mounted electronic equipment to provide necessary time for data storage.
The voltage division circuit detects a system power supply in real time, and provides signal early warning when the power is down, so that the system can respond to a power-down event in time; in addition, the influence of power supply fluctuation is filtered through an algorithm, and misoperation of the system is avoided.
The super capacitor charging power supply selects a voltage which is higher than the main power supply of the system properly, the capacity of the capacitor is fully utilized, and the power failure protection time is prolonged under the condition of ensuring that the cost is not changed.
The utility model also provides an automobile that adopts above-mentioned circuit.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (11)
1. A vehicle-mounted electronic equipment power-down protection circuit is characterized by comprising: voltage detection unit and electric power storage discharge unit of output car mains voltage signal, wherein:
the input end of the voltage detection unit is electrically connected with an automobile power supply, the first output end of the voltage detection unit is in communication connection with the control end of the vehicle-mounted electronic equipment, and the second output end of the voltage detection unit is electrically connected with the power supply end of the vehicle-mounted electronic equipment;
the input end of the electric power storage and discharge unit is electrically connected with an automobile power supply, and the output end of the electric power storage and discharge unit is electrically connected with the power supply end of the vehicle-mounted electronic equipment.
2. The power-down protection circuit for vehicle-mounted electronic equipment according to claim 1, wherein the voltage detection unit comprises: the input end of the voltage detection unit is electrically connected with the first voltage-dividing resistor and the second voltage-dividing resistor in sequence and then grounded, the connection point of the first voltage-dividing resistor and the second voltage-dividing resistor is the first output end, and the input end of the voltage detection unit is also electrically connected with the second output end.
3. The power-down protection circuit for the vehicle-mounted electronic equipment according to claim 2, wherein the voltage detection unit further comprises a reverse charging prevention module, and an input end of the voltage detection unit is electrically connected with the second output end through the reverse charging prevention module.
4. The power-down protection circuit for vehicle-mounted electronic equipment according to claim 3, wherein the anti-reverse charging module comprises a first controllable switch and a second controllable switch, two ends of the first controllable switch are electrically connected to the input end and the second output end of the voltage detection unit, respectively, a control end of the first controllable switch is electrically connected to one end of the second controllable switch, the other end of the second controllable switch is grounded, a control end of the second controllable switch is electrically connected to the input end of the voltage detection unit, when the control end of the first controllable switch is at a low level, two ends of the first controllable switch are turned on, when the control end of the first controllable switch is at a high level, two ends of the first controllable switch are turned off, and when the control end of the second controllable switch is at a high level, two ends of the second controllable switch are turned on, when the control end of the second controllable switch is at a low level, the two ends of the second controllable switch are cut off.
5. The power-down protection circuit for the vehicle-mounted electronic equipment according to claim 1, wherein the electric power storage discharge unit comprises: the charging current-limiting resistor, the super capacitor and the third controllable switch are arranged on the power storage discharging unit, the input end of the power storage discharging unit is electrically connected with the first end of the super capacitor through the charging current-limiting resistor, the second end of the super capacitor is grounded, the two ends of the third controllable switch are respectively electrically connected with the first end of the super capacitor and the output end of the power storage discharging unit, the control end of the third controllable switch is electrically connected with the input end of the voltage detection unit, when the control end of the third controllable switch is at a high level, the two ends of the third controllable switch are cut off, and when the control end of the third controllable switch is at a low level, the two ends of the third controllable switch are switched on.
6. The vehicle-mounted electronic equipment power-down protection circuit according to claim 5, wherein the electric power storage discharging unit further comprises an anti-reverse diode, and an input end of the electric power storage discharging unit is electrically connected with the charging current-limiting resistor through the anti-reverse diode.
7. The power-down protection circuit for the vehicle-mounted electronic equipment according to claim 1, further comprising a first voltage reduction unit, wherein the vehicle power supply is electrically connected with the input end of the voltage detection unit through the first voltage reduction unit.
8. The vehicle-mounted electronic device power-down protection circuit according to claim 7, wherein the first voltage reduction unit comprises a first switch-mode voltage regulator, an input end of the first switch-mode voltage regulator is electrically connected with the vehicle power supply, and an output end of the first switch-mode voltage regulator is electrically connected with an input end of the voltage detection unit.
9. The vehicle-mounted electronic equipment power-down protection circuit according to claim 8, further comprising a second voltage reduction unit, wherein the vehicle power supply is electrically connected with an input end of the electric power storage discharge unit through the second voltage reduction unit.
10. The vehicle-mounted electronic device power-down protection circuit according to claim 9, wherein the second voltage reduction unit includes a second switch-mode voltage regulator, an input terminal of the second switch-mode voltage regulator is electrically connected to the vehicle power supply, an output terminal of the second switch-mode voltage regulator is electrically connected to an input terminal of the power storage discharge unit, and a voltage regulated by the second switch-mode voltage regulator is higher than a voltage regulated by the first switch-mode voltage regulator.
11. An automobile, characterized in that the automobile employs the power-down protection circuit for the in-vehicle electronic device according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020460050.9U CN211606187U (en) | 2020-04-01 | 2020-04-01 | Vehicle-mounted electronic equipment power-down protection circuit and automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020460050.9U CN211606187U (en) | 2020-04-01 | 2020-04-01 | Vehicle-mounted electronic equipment power-down protection circuit and automobile |
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| CN211606187U true CN211606187U (en) | 2020-09-29 |
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| CN202020460050.9U Active CN211606187U (en) | 2020-04-01 | 2020-04-01 | Vehicle-mounted electronic equipment power-down protection circuit and automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564267A (en) * | 2020-12-15 | 2021-03-26 | 重庆西南集成电路设计有限责任公司 | Power supply switching circuit applied to multiple groups of power supplies |
| CN112701769A (en) * | 2020-12-30 | 2021-04-23 | 广州路派电子科技有限公司 | Circuit module and system for protecting complete video for vehicle |
-
2020
- 2020-04-01 CN CN202020460050.9U patent/CN211606187U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564267A (en) * | 2020-12-15 | 2021-03-26 | 重庆西南集成电路设计有限责任公司 | Power supply switching circuit applied to multiple groups of power supplies |
| CN112564267B (en) * | 2020-12-15 | 2023-01-31 | 重庆西南集成电路设计有限责任公司 | Power supply switching circuit applied to multiple groups of power supplies |
| CN112701769A (en) * | 2020-12-30 | 2021-04-23 | 广州路派电子科技有限公司 | Circuit module and system for protecting complete video for vehicle |
| CN112701769B (en) * | 2020-12-30 | 2023-06-30 | 广州路派电子科技有限公司 | Circuit module and system for protecting complete video for vehicle |
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