CN108306402B - Main control board super capacitor backup power supply - Google Patents
Main control board super capacitor backup power supply Download PDFInfo
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- CN108306402B CN108306402B CN201711329548.0A CN201711329548A CN108306402B CN 108306402 B CN108306402 B CN 108306402B CN 201711329548 A CN201711329548 A CN 201711329548A CN 108306402 B CN108306402 B CN 108306402B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a super-capacitor backup power supply for improving the stability and reliability of a charging pile main control board, which is designed for a set of charging pile board product, and mainly comprises a super-capacitor, a boosting chip, a switching device and the like.
Description
Technical Field
The invention relates to a main control panel super capacitor backup power supply, and belongs to the technical field of backup power supplies.
Background
The traditional lithium battery is used as a circuit board backup power supply, the performance is poor in a low-temperature environment, the service life is short, the charging speed is low, and the traditional capacitor has the defects of low energy density, few charging and discharging times and the like. In previous designs, the backup power source occupies a large area of the printed circuit board, and the application of the backup power source in cost-sensitive products is also limited by the high-cost power management chip.
The key components of the mainboard are necessary to adopt an emergency power supply which is required to have small volume, light weight, large capacity and excellent performance. The emergency power supply is developed by a cadmium-nickel battery, a hydrogen-nickel battery, a lithium battery and the like, and the traditional battery is used as a circuit board backup power supply, so that the emergency power supply is poor in performance in a low-temperature environment, short in service life and low in charging speed. The traditional capacitor has the defects of low energy density, few charging and discharging times and the like. In previous designs, the backup power source occupies a large area of the printed circuit board, and the application of the backup power source in cost-sensitive products is also limited by the high-cost power management chip.
The requirement of the rapid development of the current new generation of intelligent electronic products on the emergency power supply is higher and higher, and the main board emergency power supply develops towards the direction of high energy density, large power density, longer service life and stronger environmental adaptability.
The charging pile is generally a charging facility with high power and intermittent use, can provide one-way to several-way charging loops for vehicles, and is generally an unattended public facility.
Backup emergency power supply for the mainboard improves and fills electric pile operating stability and security very necessary. A super-capacitor backup emergency power supply adopts a low-cost and efficient electronic device to realize power closed-loop control, can be safely and stably operated, stores electric energy when a charging pile control system is normally powered on, and timely provides emergency electric energy for the charging pile control system when the charging pile control system is in power failure, solves the problems that information is lost and a high-voltage path cannot be cut off after power failure in the operation process of the prior art and products, has good power supply effect, and can greatly improve the reliability of charging pile operation.
How to provide a backup power supply with low cost, high stability and small volume is a technical problem to be solved urgently in the field.
Disclosure of Invention
The invention solves the problems that: in order to overcome the backup emergency power supply for the existing charging pile control system and improve the operation stability and safety of the charging pile, a set of charging pile product super capacitor backup power supply is designed, and the product mainly comprises a super capacitor, a boosting chip, a switching device and the like.
The purpose of the invention is realized by the following technical scheme:
the main control panel super capacitor backup power supply comprises a super capacitor, an overcharge protection circuit, a charge and discharge circuit, a booster circuit and an output control circuit;
the overcharge protection circuit controls the charge and discharge circuit to charge the super capacitor, the super capacitor discharges through the charge and discharge circuit, the booster circuit boosts the output voltage of the super capacitor to the size of the power supply voltage required by the main control panel and outputs the boosted voltage, and the output control circuit controls and outputs the output voltage of the booster circuit when external power supply stops.
Preferably, the overcharge protection circuit controls the charging circuit to charge the supercapacitor when the voltage of the supercapacitor is lower than a charging threshold, and controls the charging circuit to stop charging the supercapacitor when the voltage of the supercapacitor is higher than the overcharge protection voltage, wherein the charging threshold is lower than the overcharge protection voltage.
Preferably, the overcharge protection circuit includes a MOS transistor Q1, a voltage comparator U1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the resistors R2 and R1 are connected in series between a regulated voltage Vz and ground, a common terminal of the resistors R2 and R1 is connected to a negative input terminal of the voltage comparator U1, the resistor R3 is connected between a positive input terminal and an output terminal of the voltage comparator, the resistor R4 is connected to the positive input terminal of the voltage comparator and a positive electrode of the super capacitor, a negative electrode of the super capacitor is grounded, and a positive power supply terminal of the voltage comparator U1 is connected to an output voltage V of the voltage boost circuitoutThe gate of the MOS transistor Q1 is connected to the output terminal of the voltage comparator U1, the drain of the MOS transistor Q1 is connected to the charging circuit via the diode D4, and the source is connected to the external input power source Vin.
Preferably, the charging threshold VrechargeComprises the following steps:
overcharge protection voltage VoverchargeComprises the following steps:
Voutoutputting voltage for the booster circuit.
Preferably, the charging circuit comprises a MOS tube Q4, a diode D2, a diode D3 and a resistor R11, the drain of the MOS tube Q4 is connected with the anode of a super capacitor, the cathode of the super capacitor is grounded, the diode D2 and the diode D3 are connected between the grid of the MOS tube Q4 and the ground in series, the resistor R11 is connected between the grid and the source of the MOS tube Q4, and the source of the MOS tube Q4 receives charging current under the control of the overcharge protection circuit.
Preferably, the boost circuit comprises a boost chip U3, an inductor L1, a capacitor C3, a resistor R9 and a resistor R10; the resistor R9 and the resistor R10 are connected between the output end of the boost chip U3 and the ground in series, and the common end of the resistor R9 and the resistor R10 is connected with the output feedback end FB of the boost chip U3; one end of the inductor L1 is connected with the output end of the charging and discharging circuit, the other end of the inductor L1 is connected with the switch conversion pin SW of the boost chip U3, the capacitor C3 is connected between the power input end VBAT of the boost chip U3 and the ground, and the enable end EN of the boost chip U3 is connected with the output end of the charging and discharging circuit and the power input end VBAT of the boost chip U3.
Preferably, the preset output voltage Vp of the boost chip U3 is:
preferably, the output control circuit outputs the output voltage of the boosting circuit when the output of the boosting chip U3 is greater than the output turn-on threshold, and stops the output voltage of the boosting circuit when the output of the boosting chip U3 is lower than the discharge threshold.
Preferably, the output control circuit comprises resistors R5, R6, R7, R8 and R12, a voltage comparator U2, a triode Q3 and a PMOS tube Q2; one end of the resistor R5 is connected with the stabilized voltage Vz, and the other end of the resistor R5 is connected with the negative input end of the voltage comparator U2; the resistor R6 is connected between the positive input end of the voltage comparator U2 and the ground; one end of the resistor R7 receives the output voltage of the booster circuit, and the other end is connected with the positive input end of the voltage comparator U2; the resistor R8 is connected between the positive input end and the output end of the voltage comparator U2; the positive power supply end of the voltage comparator U2 is connected with the output voltage V of the booster circuitoutThe base stage of the triode Q3 is connected with the output end of a voltage comparator U2, the emitter is grounded, the collector is connected with the gate of a PMOS tube Q2, the drain of the PMOS tube Q2 is connected with the output end of a boosting circuit, the source of the PMOS tube Q2 is used as the voltage output end of a master control board super capacitor backup power supply, a resistor R12 is connected with the source of a PMOS tube Q2 and the boosting circuitBetween the outputs of the circuit.
Preferably, the output opening threshold Vout_HComprises the following steps:
threshold value of discharge Vout_LComprises the following steps:
compared with the prior art, the invention has the following advantages:
(1) the invention adopts the super capacitor as the standby power supply of the processor, and can provide enough time for the MCU to check faults and record and store data when the MCU fails.
(2) The invention designs an overcharge protection circuit for the super capacitor, thereby preventing overcharge and ensuring system safety; the overcharge protection circuit is respectively provided with a charging threshold value to ensure the timeliness of charging, and is provided with overcharge protection voltage to prevent overcharge
(3) The invention meets the design requirement of low cost, does not use high-cost elements such as a capacitor charge-discharge management chip, a lithium battery and the like, uses the super capacitor, has small volume, low cost, high charge-discharge speed and more electricity replay times, and is suitable for a power supply main control board with low cost, compact structure and large emergency power failure harm.
Drawings
FIG. 1 is a block diagram of a backup power pack of the present invention;
fig. 2 is a schematic diagram of a backup power circuit of the present invention.
Detailed Description
The invention relates to a super capacitor backup power supply of a charging pile main control board, which comprises an overcharge protection circuit, a charging circuit, a super capacitor, a booster circuit and an output control circuit. The overcharge protection circuit receives the power supply voltage Vin from the charging pile plate electrode product, controls the super capacitor, controls the charging of the super capacitor, and controls the voltage of the super capacitor to be increased to the voltage required by the plate-level product by the booster circuit, and the output control controls the output of the whole power supply. As shown in particular in figure 1.
(1) The super capacitor is a power supply which is arranged between a traditional capacitor and a battery and has special performance, the discharge speed is high, the capacity is large, huge energy can be released instantly, the charge-discharge cycle can reach millions of times, and the super capacitor is very suitable for being used as a standby power supply and provides energy for a system in a very short time when the system is suddenly powered off. The characteristics are as follows:
A. the charging speed is high, and the charging time can reach more than 95% of the rated capacity after 10 seconds to 10 minutes;
B. the cycle service life is long, the cycle use frequency of deep charge and discharge can reach 1-50 ten thousand times, and no memory effect exists;
C. the large-current discharge capacity is super strong, the energy conversion efficiency is high, the process loss is small, and the large-current energy circulation efficiency is more than or equal to 90 percent;
D. the power density is high and can reach 300-5000W/KG, which is 5-10 times of that of the battery;
E. the raw materials of the product are pollution-free in the processes of composition, production, use, storage and disassembly, and the product is an ideal green and environment-friendly power supply;
F. the ultralow temperature property is good, and the temperature range is wide from minus 40 ℃ to plus 70 ℃;
the super capacitor is used as an energy carrier of the design, so that electric energy for 5s of work of the charging pile control system can be stored, the charging pile control system can complete user information storage, and a high-voltage path is cut off.
(2) The overcharge protection circuit has the function of avoiding the continuous charging after the charging of the super capacitor is finished, if the super capacitor is overcharged, the super capacitor is broken down if the super capacitor is light, and the super capacitor is exploded if the super capacitor is heavy.
The invention discloses an overcharge protection circuit which comprises an MOS (metal oxide semiconductor) transistor Q1, an amplifier U1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein Q1 is a P-channel MOS transistor, and a voltage comparator U1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 form a comparison circuit. The resistors R2 and R1 are connected in series between a stable voltage Vz and the ground, the common end of the resistors R2 and R1 is connected with the negative input end of the voltage comparator U1, the resistor R3 is connected between the positive input end and the output end of the voltage comparator, the resistor R4 is connected between the positive input end of the voltage comparator and the anode of the super capacitor, the cathode of the super capacitor is grounded, the gate of the MOS tube Q1 is connected with the output end of the voltage comparator U1, the drain of the MOS tube Q1 is connected with the charging circuit through the diode D4, and the source is connected with an external input power Vin. The MOS transistor Q1 operates in a switching state,
the P-channel MOS tube Q1 is used for protecting the super capacitor and preventing overcharging, when the voltage of the super capacitor is lower than 2.7V, the voltage comparator U1 outputs high level, the P-channel MOS tube Q1 is conducted, the charging current passes through the nitryl diode D4 and charges the super capacitor through the P-channel MOS tube Q4, then when the voltage of the super capacitor rises to 2.7V, the voltage comparator U1 outputs low level, the P-channel MOS tube Q1 is closed, and the super capacitor is stopped being charged. When the voltage of the super capacitor is lower than 2.4V due to discharge, the voltage comparator U1 outputs high level again to charge the super capacitor.
When the voltage of the super capacitor is lower than 2.7V, Q1 is turned on, and the charging current charges the super capacitor through a diode D4; then when the voltage of the super capacitor reaches 2.7V, closing Q1 and stopping electrifying; when the super capacitor discharges through the load to 2.4V, Q1 is reopened. Q1 controls the desired level to be output by the output control circuit.
The U1 of the invention is used for controlling the on-off of Q1 in the overcharge protection, and as can be obtained from FIG. 2, the expressions of the overcharge protection voltage Vovercharge and the recharge voltage Vrecharge of the super capacitor are as follows:
the Vz of the invention is 2.5V, VoutFor the U3 output voltage, Vovercharge was set to 2.7V and Vrecharge to 2.4V. That is, when the supercapacitor voltage is greater than 2.7V, Q1 is turned off, stopping charging. When the voltage of the super capacitor is less than 2.4V, Q1 is opened and the charge is recharged.
(3) The charging and discharging circuit is a bridge between the super capacitor and the power supply and the load, and when the power supply supplies power normally, the super capacitor is charged through the charging and discharging circuit.
The charging circuit and the discharging circuit of the super capacitor are composed of Q4, D2, D3 and R11, the minimum charging voltage of the super capacitor is limited by the aid of the partial circuits, the voltage value is the sum of voltages of pins D2, D3 and Q4GS, and the design is 1.6V. D1 is a freewheeling diode, D4 is used to prevent current from flowing backwards.
(4) The output control circuit completes the state detection and real-time control of the whole backup emergency power supply and the output and the turn-off of the backup emergency power supply.
The present design implements the comparator function in a positive feedback manner, and without a feedback circuit, a capacitor drifting from the output to the input (usually the in-phase input) or an output current coupled to ground (usually the in-phase input is connected to ground) may cause the comparator circuit to become unstable. Maintaining a high impedance node will help minimize both coupling effects. The use of positive feedback, which has the effect of separating the rising and falling switching points, is a common and effective solution to increase the hysteresis, so that once the switching operation has started, the input must undergo a very long reversal to begin the switch in the opposite direction.
The output control circuit comprises resistors R5, R6, R7, R8 and R12, a voltage comparator U2, an NPN triode Q3 and a PMOS tube Q2. The voltage comparator U2, the resistors R5, R6, R7 and R8 form a comparison circuit, the resistor R5 is connected with a voltage stabilizing output end of a voltage stabilizing tube Q5, the resistor R8 is connected between a positive input end and an output end of the voltage comparator, the resistor R7 is connected between a positive input end of the voltage comparator and a VOUT end of the boost chip U3, and the resistor R6 is connected between a positive input end of the voltage comparator U2 and the ground. The base stage of the NPN triode Q3 is connected with the output end of the voltage comparator U2, the emitter is grounded, the collector is connected with the gate of the PMOS tube Q2, and the drain of the PMOS tube Q2 is connected with the VOUT end of the boost chip.
When the output voltage of the VOUT end of the boosting chip U3 is larger than 3.26V, the voltage comparator U2 outputs high level, the NPN triode is conducted, the PMOS tube Q2 is conducted, the backup power output is connected with the load circuit, and power is provided for the mainboard. When the output voltage of the VOUT end of the boosting chip U3 is lower than 2.78V, the voltage comparator U2 outputs low level, the output of the NPN triode is turned off, the PMOS tube Q2 is low, and the output of the backup power supply is disconnected with the load circuit.
The U2 of the invention is used for controlling the on-off of Q2 in the discharge circuit, which can be obtained from a circuit schematic diagram, and the discharge high voltage threshold V output by U3out_HAnd a discharge low voltage threshold Vout_LThe expression is as follows:
the V3.3_ H is set to be 3.26V, and the V3.3_ H is set to be 2.78V. That is, when the booster circuit output voltage is greater than 3.26V, Q2 and Q3 are turned on to output a current. When the output voltage of the booster circuit is less than 2.78V, Q2 and Q3 are closed, and the current output is stopped.
When the power supply Vin is powered off, the voltage of the negative input end of the U2 is 0, the U2 outputs high level, the Q3 is turned on, the Q2 is turned on, and output is realized
(5) The use of boost circuit can be with the voltage conversion of super capacitor for filling the required steady voltage of electric pile control system, and super capacitor's voltage is less than 2.7V, and fills electric pile control system and adopt 3.3V, consequently adopts the mode that steps up.
The Boost circuit comprises an integrated Boost chip U3, an inductor L1, a capacitor C3, a resistor R9 and a resistor R10, and is used for boosting the voltage of a super capacitor to the system voltage of a board-level product, wherein the voltage output by U3 is as follows:
the system voltage of the charging pile plate electrode product is mostly 3.3V, so that the design sets the output voltage of U3 to be 3.3V. The discharge time of the invention can reach 20s generally, and the power provided by the invention is large.
By adopting the backup emergency power supply for the charging pile control system, the operation stability and safety of the charging pile are very necessary to be improved.
It will be understood that while the present invention has been described in terms of the preferred embodiment, it is not intended to limit the invention to that embodiment. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (1)
1. A master control board super capacitor backup power supply is characterized by comprising a super capacitor, an overcharge protection circuit, a charge and discharge circuit, a booster circuit and an output control circuit;
the overcharge protection circuit controls the charge and discharge circuit to charge the super capacitor, the super capacitor discharges through the charge and discharge circuit, the booster circuit boosts the output voltage of the super capacitor to the power supply voltage required by the main control panel and outputs the boosted voltage, and the output control circuit controls the output voltage of the booster circuit to be output when external power supply stops;
the boosting circuit comprises a boosting chip U3, an inductor L1, a capacitor C3, a resistor R9 and a resistor R10; the resistor R9 and the resistor R10 are connected between the output end of the boost chip U3 and the ground in series, and the common end of the resistor R9 and the resistor R10 is connected with the output feedback end FB of the boost chip U3; one end of the inductor L1 is connected with the output end of the charging and discharging circuit, the other end of the inductor L1 is connected with a switch conversion pin SW of the boost chip U3, the capacitor C3 is connected between the power input end VBAT of the boost chip U3 and the ground, and the enable end EN of the boost chip U3 is connected with the output end of the charging and discharging circuit and the power input end VBAT of the boost chip U3;
output voltage V of boost chip U3outComprises the following steps:
the overcharge protection circuit controls the charging circuit to charge the super capacitor when the voltage of the super capacitor is lower than a charging threshold value, and controls the charging circuit to stop charging the super capacitor when the voltage of the super capacitor is higher than the overcharge protection voltage, wherein the charging threshold value is lower than the overcharge protection voltage;
the overcharge protection circuit comprises a MOS transistor Q1, a voltage comparator U1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the resistors R2 and R1 are connected between a stable voltage Vz and the ground in series, the common end of the resistors R2 and R1 is connected with the negative input end of the voltage comparator U1, the resistor R3 is connected between the positive input end and the output end of the voltage comparator, the resistor R4 is connected between the positive input end of the voltage comparator and the positive electrode of a super capacitor, the negative electrode of the super capacitor is grounded, and the positive power supply end of the voltage comparator U1 is connected with the output voltage V of the booster circuitoutThe grid electrode of the MOS tube Q1 is connected with the output end of the voltage comparator U1, the drain electrode of the MOS tube Q1 is connected with the charging circuit through the diode D4, and the source electrode of the MOS tube Q8926 is connected with an external input power Vin;
the charging threshold value VrechargeComprises the following steps:
overcharge protection voltage VoverchargeComprises the following steps:
Voutoutputting voltage for the booster circuit;
the charging circuit comprises an MOS tube Q4, a diode D2, a diode D3 and a resistor R11, wherein the drain electrode of the MOS tube Q4 is connected with the anode of a super capacitor, the cathode of the super capacitor is grounded, the diode D2 and the diode D3 are connected between the grid electrode of the MOS tube Q4 and the ground in series, the resistor R11 is connected between the grid electrode and the source electrode of the MOS tube Q4, and the source electrode of the MOS tube Q4 receives charging current under the control of the overcharge protection circuit;
the output control circuit outputs the output voltage of the boosting circuit when the output of the boosting chip U3 is larger than an output starting threshold value, and stops the output voltage of the boosting circuit when the output of the boosting chip U3 is lower than a discharging threshold value;
the output control circuit comprises resistors R5, R6, R7, R8 and R12, a voltage comparator U2, a triode Q3 and a PMOS tube Q2; one end of the resistor R5 is connected with the stabilized voltage Vz, and the other end of the resistor R5 is connected with the negative input end of the voltage comparator U2; the resistor R6 is connected between the positive input end of the voltage comparator U2 and the ground; one end of the resistor R7 receives the output voltage of the booster circuit, and the other end is connected with the positive input end of the voltage comparator U2; the resistor R8 is connected between the positive input end and the output end of the voltage comparator U2; the positive power supply end of the voltage comparator U2 is connected with the output voltage V of the booster circuitoutThe base stage of the triode Q3 is connected with the output end of the voltage comparator U2, the emitter is grounded, the collector is connected with the gate of the PMOS tube Q2, the drain of the PMOS tube Q2 is connected with the output end of the booster circuit, the source of the PMOS tube Q2 is used as the voltage output end of the master control board super capacitor backup power supply, and the resistor R12 is connected between the source of the PMOS tube Q2 and the output end of the booster circuit;
output opening threshold Vout_HComprises the following steps:
threshold value of discharge Vout_LComprises the following steps:
when the output voltage of the VOUT end of the boosting chip U3 is larger than 3.26V, the voltage comparator U2 outputs high level, the NPN triode is conducted, the PMOS tube Q2 is conducted, the backup power output is connected with the load circuit, and power is provided for the mainboard; when the output voltage of the VOUT end of the boosting chip U3 is lower than 2.78V, the voltage comparator U2 outputs low level, the NPN triode is turned off, the PMOS tube Q2 is low, and the output of the backup power supply is disconnected with the load circuit.
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Families Citing this family (8)
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| CN110797965B (en) * | 2019-10-11 | 2023-04-28 | 中国直升机设计研究所 | Electricity conversion structure and method |
| CN110649701A (en) * | 2019-10-28 | 2020-01-03 | 天津七一二通信广播股份有限公司 | Integrated backup power supply unit with super capacitor as energy storage core and implementation method |
| CN111130210B (en) * | 2020-01-06 | 2023-05-23 | 北京中电飞华通信有限公司 | Main and standby power management system |
| CN111786552A (en) * | 2020-07-15 | 2020-10-16 | 河南许继仪表有限公司 | Super capacitor-based booster circuit |
| CN112290629B (en) * | 2020-10-20 | 2023-04-14 | 四川铁公铁信息技术有限公司 | Method for improving battery power supply efficiency through super capacitor |
| CN112583074A (en) * | 2020-12-11 | 2021-03-30 | 南方电网科学研究院有限责任公司 | Charging and discharging circuit of super capacitor |
| CN113328508B (en) * | 2021-05-13 | 2022-04-29 | 东风汽车集团股份有限公司 | Standby power supply circuit |
| CN113629849A (en) * | 2021-07-30 | 2021-11-09 | 科大智能电气技术有限公司 | Alternating current power supply and backup power supply system of energy controller and use method |
Family Cites Families (4)
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| CN103647259B (en) * | 2013-11-29 | 2016-05-25 | 无锡中感微电子股份有限公司 | A kind of battery protecting circuit and interior voltage protection circuit thereof |
| CN103840522B (en) * | 2014-03-05 | 2016-04-27 | 中煤科工集团重庆研究院有限公司 | A kind of mining battery supply |
| CN204068412U (en) * | 2014-07-28 | 2014-12-31 | 珠海欧力配网自动化股份有限公司 | The microcomputer protecting device of a kind of integrated super electric capacity power supply in support |
| CN105914868B (en) * | 2016-05-18 | 2019-05-14 | 西安科技大学 | Super capacitor energy-storage uninterruptible power supply and its method of supplying power to based on current transformer |
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2017
- 2017-12-13 CN CN201711329548.0A patent/CN108306402B/en active Active
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