CN214799020U - Vehicle-mounted terminal dual-standby power supply system - Google Patents
Vehicle-mounted terminal dual-standby power supply system Download PDFInfo
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- CN214799020U CN214799020U CN202120485238.3U CN202120485238U CN214799020U CN 214799020 U CN214799020 U CN 214799020U CN 202120485238 U CN202120485238 U CN 202120485238U CN 214799020 U CN214799020 U CN 214799020U
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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 double-standby power supply system of a vehicle-mounted terminal, which comprises a super capacitor, a super capacitor charging circuit, a rechargeable battery charging circuit, a switching circuit and a load; at the moment of power failure, the super capacitor supplies power to meet the requirement of large load current at the moment of power failure, and after the super capacitor finishes a power supply task, the super capacitor is switched to the rechargeable battery by the switching circuit to supply power continuously; in this way, the backup rechargeable battery only needs enough capacity to meet the demand, and the backup rechargeable battery does not need very large load capacity, so that the cost is greatly reduced, and the service life is long.
Description
Technical Field
The utility model belongs to the technical field of the on-vehicle electronic product, concretely relates to two stand-by power supply system of vehicle terminal.
Background
With the diversification and development of vehicle-mounted electronic products, the vehicle-mounted electronic products have become indispensable devices for vehicle control and vehicle safety monitoring. For some terminal devices of vehicle control and vehicle safety monitoring, the operating state of the vehicle is controlled and parameters are monitored not only during the normal operation of the vehicle, but also during a period of time after the vehicle is shut down, the related state of the vehicle needs to be monitored, and storage of some monitoring data is completed, which requires that the terminal devices have a safe and reliable standby power supply, and the device is maintained to operate for a period of time after the vehicle is shut down. After the power supply of the vehicle-mounted terminal is cut off, the power state monitoring circuit needs to cut off some unnecessary loads after monitoring that the power supply is cut off so as to reduce unnecessary electric energy loss of the standby power supply, but the vehicle-mounted terminal still runs under full load in the period from the power failure to the power failure of the system response, so that a short-time large current impact can be generated on the standby power supply. On the other hand, after the vehicle is shut down, the vehicle-mounted terminal needs to be kept running for a period of time, and the electric quantity of the standby power supply also can meet the requirement of the system. In summary, the backup power source has both a large load capacity and a sufficient shock capacity. Traditional stand-by power supply scheme uses a heavy load ability and the single stand-by power supply of large capacity, satisfies the heavy current demand in the twinkling of an eye of outage and the long-time continuous work of vehicle terminal after the outage, is a very big waste to power load ability, and to a great extent has increased stand-by power supply's cost.
Disclosure of Invention
The utility model provides a defect and problem that exist to existing equipment, the utility model provides a two stand-by power supply system of vehicle mounted terminal, the effectual single stand-by power supply who uses a heavy load ability and large capacity that exists among the existing equipment of having solved satisfies the long-time continuous work of vehicle mounted terminal after the heavy current demand in the twinkling of an eye that cuts off the power supply and the outage, and is with high costs, awkward problem.
The utility model provides a scheme that its technical problem adopted is: a vehicle-mounted terminal dual-standby power supply system comprises a super capacitor, a super capacitor charging circuit, a rechargeable battery charging circuit, a switching circuit and a load; at the moment of power failure, the super capacitor supplies power to meet the requirement of large load current at the moment of power failure, and after the super capacitor finishes a power supply task, the super capacitor is switched to the rechargeable battery by the switching circuit to supply power continuously; the super capacitor charging circuit comprises a voltage comparator U5A, a triode Q8, a current-limiting resistor, a triode Q5 and an MOS tube M8; the charging end is connected to the super capacitor through a current-limiting resistor and an MOS (metal oxide semiconductor) transistor M8, and the current-limiting resistor controls the conduction of the MOS transistor M8 through a triode Q5; two input ends of a voltage comparator U5A are used for acquiring and comparing super capacitor voltage and standard voltage, and an output end of the voltage comparator U5A controls an MOS transistor M8 to work through a triode Q8; the switching circuit comprises a voltage comparator U5B, a triode Q23 and a MOS tube M12, wherein two input ends of the voltage comparator U5B are respectively connected with a super capacitor and a rechargeable battery, the output end of the voltage comparator U5B is connected with the MOS tube M12 through the triode Q23, when the voltage of the super capacitor is lower than that of the rechargeable battery, the reverse input voltage of the U5B is higher than the same-direction input voltage, the output state of the comparator is reversed, and the MOS tube M12 is controlled to be opened, so that the rechargeable battery is connected into the circuit to supply power for a load.
Further, a diode D13 for clamping is connected in parallel to the current limiting resistor.
Furthermore, the rechargeable battery charging circuit comprises a PWM circuit, a voltage indicating circuit, a filter circuit and a battery voltage monitoring circuit; the PWM circuit comprises a MOS tube M11 and an inductor L3 which are connected together in series, the grid electrode of the MOS tube M11 is connected to a charging management chip U11, and DCDC conversion from a power supply voltage to a battery voltage is realized; the voltage indicating circuit comprises R74 and R83 which are connected in series, and the value of the charging voltage is set through the values of the two resistors; the filter circuit comprises voltage filter capacitors C38 and C39, wherein the voltage filter capacitors C38 and C39 are charging output and are used for filtering ripples of output voltage of the charging circuit, the battery voltage monitoring circuit comprises a resistor R80 and a thermistor, and the resistor R80 is connected to a charging management chip U11 through the thermistor.
Furthermore, two input ends of the voltage comparator U5A are connected with the super capacitor and the standard voltage through two divider resistors.
The utility model has the advantages that: the utility model discloses a mode of realizing of two stand-by power supply schemes of vehicle mounted terminal, use the mode of super capacitor and reserve rechargeable battery combination, in the twinkling of an eye in the outage, super capacitor discharges, MOS pipe M8 is in the off-state during discharge, and Q5 is in the district that ends, can not influence discharging current, super capacitor when charging, triode Q5 switches on and applys control current at MOS pipe M8 grid, make MOS pipe M8 switch on, after the super capacitor charge volume reaches the certain degree, voltage comparator U5A's output low level, triode Q8's base region is used to the low level, make its collector position electric potential concordance reduce, make MOS pipe M8 disconnection.
When the circuit is switched, two input ends of the voltage comparator U5B are respectively connected with the super capacitor and the rechargeable battery, when the voltage of the super capacitor is greater than that of the rechargeable battery, the super capacitor is preferentially applied to supply power, the voltage of the super capacitor is gradually reduced along with the consumption of the super capacitor, then the output end of the voltage comparator is inverted, and the power supply circuit is switched to the rechargeable battery for continuous power supply.
Therefore, the utility model discloses can satisfy the power failure in the twinkling of an eye heavy current demand, later long-time work power supply, reserve rechargeable battery discharges, and through this kind of mode, reserve rechargeable battery only needs enough capacity just can satisfy the demand, and reserve rechargeable battery does not need very big load capacity to make its cost reduce by a wide margin, and long service life.
Drawings
Fig. 1 is a system block diagram of the present invention.
FIG. 2 is a diagram of a super capacitor charging circuit.
Fig. 3 is a charging circuit diagram of a rechargeable battery.
Fig. 4 is a circuit diagram of a switching circuit.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Example 1: the embodiment aims at providing a two stand-by power supply system of vehicle-mounted terminal, mainly to on-vehicle power supply, on-vehicle outage initial stage, vehicle-mounted terminal still needs the heavy current, along with the cutting off of load, partial load still needs long-time power supply demand, current mode is for utilizing a single stand-by power supply of heavy load ability and large capacity, but this kind of mode is with high costs, and big to the power loss, has caused the waste, based on this, this embodiment provides a two stand-by power supply system that ultracapacitor system and rechargeable battery combine.
A double-standby power supply system of a vehicle-mounted terminal comprises a super capacitor, a super capacitor charging circuit, a rechargeable battery charging circuit, a switching circuit and a load; at the moment of power failure, the super capacitor supplies power to meet the requirement of large load current at the moment of power failure, and after the super capacitor finishes a power supply task, the super capacitor is switched to the rechargeable battery by the switching circuit to supply power continuously.
As shown in fig. 1, the super capacitor supplies power at the moment of power failure, so as to meet the requirement of large load current at the moment of power failure; after the super capacitor finishes the power supply task, the rechargeable battery continuously supplies power until the vehicle-mounted terminal stops working; the super capacitor charging circuit charges the super capacitor when the system works normally; the rechargeable battery charging circuit charges the rechargeable battery when the system works normally; and the switching circuit completes switching in the power supply process of the super capacitor and the rechargeable battery after power failure.
In this embodiment, the super capacitor charging circuit includes a voltage comparator U5A, a transistor Q8, a current limiting resistor, a transistor Q5, and a MOS transistor M8; the charging end is connected to the super capacitor through a current-limiting resistor and an MOS (metal oxide semiconductor) transistor M8, and the current-limiting resistor controls the conduction of the MOS transistor M8 through a triode Q5; two input ends of a voltage comparator U5A are used for acquiring and comparing super capacitor voltage and standard voltage, and an output end of the voltage comparator U5A controls an MOS transistor M8 to work through a triode Q8; the switching circuit comprises a voltage comparator U5B, a triode Q23 and a MOS tube M12, wherein two input ends of the voltage comparator U5B are respectively connected with a super capacitor and a rechargeable battery, the output end of the voltage comparator U5B is connected with the MOS tube M12 through the triode Q23, when the voltage of the super capacitor is lower than that of the rechargeable battery due to discharging, the reverse input voltage of the U5B is higher than the same-direction input voltage, the output state of the comparator is reversed, the MOS tube M12 is controlled to be opened, and therefore the rechargeable battery is connected into the circuit to supply power for a load.
Specifically, as shown in fig. 2, in the super capacitor charging circuit diagram, CP7, CP8, CP9, CP10 and CP11 are 5 super capacitors connected in series; r33 is a current-limiting resistor, when charging, charging current flows through R33, two ends of R33 generate a voltage due to ohm' S law, the voltage value increases along with the increase of the current value, when the voltage increases to a certain value, the triode Q5 is amplified, the voltage difference between the C pole and the E pole of the triode Q5 is gradually reduced, the GS voltage of the MOS transistor M8 is gradually reduced until the voltage reaches balance, at the moment, the current flowing through the S pole and the D pole of the M8 also reaches balance, the current plays a role of constant current charging by a constant value, the resistance value of R33 is changed, and the magnitude of constant current can be changed; during discharging, the Q5 is in a cut-off region and does not influence the discharging current.
U5A is a voltage comparator, when the voltage of super capacitor is gradually increased along with the charging process, the voltage is increased, the voltage of pin 2 of U5A is gradually increased, when the voltage of pin 2 is higher than the voltage of pin 3, the voltage state of pin 1 of output pin of the comparator is reversed and changed to low level, thereby turning off Q8 in the on state, after Q8 is turned off, the GS voltage of M8 is greater than the off voltage thereof, and the charging is stopped. Two input ends of a voltage comparator U5A are connected with a super capacitor and a standard voltage through two divider resistors, wherein the end part of a pin 2 of the voltage comparator U5A is connected with R47 and R39 in parallel, the end part of a pin 3 is connected with R40 and R48 in parallel, R48 is connected with +5V standard voltage, and R48 is connected with a capacitor C32 in parallel, so that the voltage value when the charging is stopped can be changed by changing the resistance values of R40 and R48.
The current-limiting resistor is connected in parallel with a diode D13 for clamping, so that the phenomenon that the sampling resistor generates an excessively high voltage drop to cause a low rear-stage output voltage during heavy current discharge is avoided.
The rechargeable battery charging circuit comprises a PWM circuit, a voltage indicating circuit, a filter circuit and a battery voltage monitoring circuit; the PWM circuit comprises a MOS tube M11 and an inductor L3 which are connected together in series, the grid electrode of the MOS tube M11 is connected to a charging management chip U11, and DCDC conversion from a power supply voltage to a battery voltage is realized; the voltage indicating circuit comprises R74 and R83 which are connected in series, and the value of the charging voltage is set through the values of the two resistors; the filter circuit comprises voltage filter capacitors C38 and C39, wherein the voltage filter capacitors C38 and C39 are charging output and are used for filtering ripples of output voltage of the charging circuit, the battery voltage monitoring circuit comprises a resistor R80 and a thermistor, and the resistor R80 is connected to a charging management chip U11 through the thermistor.
As shown in fig. 3, U10 is a charging management chip, which can monitor the charging process; m11 is an external MOS tube of U10, M11 and L3 form a PWM circuit together, and DCDC conversion from power supply voltage to battery voltage is realized; r74 and R83 are voltage indicating circuits, and the value of the charging voltage can be set by the values of the two resistors; c38 and C39 are voltage filter capacitors for charging output, and filter the ripple of the output voltage of the charging circuit. R80 and a thermistor on the battery form a battery voltage monitoring circuit, and when the battery voltage is too high or too low, the U10 stops charging the battery to protect the battery. C37 is a filter capacitor, and reduces the interference of external interference on the 1 pin voltage of U10. C41 and C43 are compensation capacitors, and R82 and C42 form an RC compensation circuit together. LED2 and LED3 are charge status indicators; j2 is a rechargeable battery receptacle.
Fig. 4 is a circuit diagram of a super capacitor and rechargeable battery switching circuit. The circuit designs a voltage comparator through U5B, when the voltage of the super capacitor is reduced due to discharge and is lower than the voltage of the rechargeable battery, the 6-pin voltage of U5B is higher than the 5-pin voltage, the output state of the comparator is inverted, and the MOS transistor M12 is controlled to be opened, so that the rechargeable battery is connected into the circuit to supply power to the load.
Therefore, in the embodiment, a mode of combining the super capacitor and the standby rechargeable battery is used, the super capacitor discharges at the moment of power failure, the high-current requirement at the moment of power failure is met, and the standby rechargeable battery discharges after long-time working power supply. In this way, the backup rechargeable battery needs only enough capacity to meet the demand, and the backup rechargeable battery does not need very large load capacity, so that the cost thereof is greatly reduced.
Claims (4)
1. The utility model provides a two stand-by power supply system of vehicle terminal which characterized in that: the charging circuit comprises a super capacitor, a super capacitor charging circuit, a rechargeable battery charging circuit, a switching circuit and a load; at the moment of power failure, the super capacitor supplies power to meet the requirement of large load current at the moment of power failure, and after the super capacitor finishes a power supply task, the super capacitor is switched to the rechargeable battery by the switching circuit to supply power continuously; the super capacitor charging circuit comprises a voltage comparator U5A, a triode Q8, a current-limiting resistor, a triode Q5 and an MOS tube M8; the charging end is connected to the super capacitor through a current-limiting resistor and an MOS (metal oxide semiconductor) transistor M8, and the current-limiting resistor controls the conduction of the MOS transistor M8 through a triode Q5; two input ends of a voltage comparator U5A are used for acquiring and comparing super capacitor voltage and standard voltage, and an output end of the voltage comparator U5A controls an MOS transistor M8 to work through a triode Q8; the switching circuit comprises a voltage comparator U5B, a triode Q23 and a MOS tube M12, wherein two input ends of the voltage comparator U5B are respectively connected with a super capacitor and a rechargeable battery, the output end of the voltage comparator U5B is connected with the MOS tube M12 through the triode Q23, when the voltage of the super capacitor is lower than that of the rechargeable battery, the reverse input voltage of the U5B is higher than the same-direction input voltage, the output state of the comparator is reversed, and the MOS tube M12 is controlled to be opened, so that the rechargeable battery is connected into the circuit to supply power for a load.
2. The vehicle-mounted terminal dual standby power supply system according to claim 1, characterized in that: the current limiting resistor is connected in parallel with a diode D13 for clamping.
3. The vehicle-mounted terminal dual standby power supply system according to claim 1, characterized in that: the rechargeable battery charging circuit comprises a PWM circuit, a voltage indicating circuit, a filter circuit and a battery voltage monitoring circuit; the PWM circuit comprises a MOS tube M11 and an inductor L3 which are connected together in series, the grid electrode of the MOS tube M11 is connected to a charging management chip U11, and DCDC conversion from a power supply voltage to a battery voltage is realized; the voltage indicating circuit comprises R74 and R83 which are connected in series, and the value of the charging voltage is set through the values of the two resistors; the filter circuit comprises voltage filter capacitors C38 and C39, wherein the voltage filter capacitors C38 and C39 are charging output and are used for filtering ripples of output voltage of the charging circuit, the battery voltage monitoring circuit comprises a resistor R80 and a thermistor, and the resistor R80 is connected to a charging management chip U11 through the thermistor.
4. The vehicle-mounted terminal dual standby power supply system according to claim 1, characterized in that: and two input ends of the voltage comparator U5A are connected with the super capacitor and the standard voltage through two divider resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120485238.3U CN214799020U (en) | 2021-03-08 | 2021-03-08 | Vehicle-mounted terminal dual-standby power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120485238.3U CN214799020U (en) | 2021-03-08 | 2021-03-08 | Vehicle-mounted terminal dual-standby power supply system |
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| CN214799020U true CN214799020U (en) | 2021-11-19 |
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| CN202120485238.3U Active CN214799020U (en) | 2021-03-08 | 2021-03-08 | Vehicle-mounted terminal dual-standby power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115195642A (en) * | 2022-09-14 | 2022-10-18 | 湖北芯擎科技有限公司 | Power supply circuit of automatic driving controller |
| CN117239906A (en) * | 2023-11-10 | 2023-12-15 | 南京思宇电气技术有限公司 | Control system and method for backup power supply of power distribution and utilization terminal |
-
2021
- 2021-03-08 CN CN202120485238.3U patent/CN214799020U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115195642A (en) * | 2022-09-14 | 2022-10-18 | 湖北芯擎科技有限公司 | Power supply circuit of automatic driving controller |
| CN115195642B (en) * | 2022-09-14 | 2023-01-06 | 湖北芯擎科技有限公司 | Power supply circuit of automatic driving controller |
| CN117239906A (en) * | 2023-11-10 | 2023-12-15 | 南京思宇电气技术有限公司 | Control system and method for backup power supply of power distribution and utilization terminal |
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