CN112202228A - Double cell charge-discharge isolation power supply circuit - Google Patents
Double cell charge-discharge isolation power supply circuit Download PDFInfo
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- CN112202228A CN112202228A CN202011125869.0A CN202011125869A CN112202228A CN 112202228 A CN112202228 A CN 112202228A CN 202011125869 A CN202011125869 A CN 202011125869A CN 112202228 A CN112202228 A CN 112202228A
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- 238000002955 isolation Methods 0.000 title claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 238000007599 discharging Methods 0.000 claims abstract description 48
- 230000002265 prevention Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 230000001360 synchronised effect Effects 0.000 claims abstract description 10
- 230000002441 reversible effect Effects 0.000 claims abstract description 6
- 238000010891 electric arc Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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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
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/36—Arrangements using end-cell switching
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A double-battery charging and discharging isolation power supply circuit comprises a first relay, a second relay, a third relay and a fourth relay, and is used for charging and discharging switching of a first battery pack and a second battery pack; the first relay driving circuit is used for synchronously driving the first relay and the second relay; the second relay driving circuit is used for the reverse phase synchronous driving of the third relay and the fourth relay; the super capacitor circuit is used for keeping power supply to a load in the charge-discharge switching process of the first battery pack and the second battery pack; the backflow prevention circuit is used for preventing the current of the load from flowing backwards to the charger; the MCU controller is used for realizing charging and discharging switching of the first battery pack and the battery pack through the first relay drive circuit and the second relay drive circuit; and the voltage monitoring circuit is used for continuously monitoring the discharge voltage of the first battery pack and the second battery pack by the MCU controller.
Description
Technical Field
The invention relates to the technical field of power supply circuits, in particular to a double-battery charging and discharging isolation power supply circuit.
Background
For application scenarios such as power supply of detection equipment of a seismic station, backup emergency power supply and power supply of precision equipment, a power supply circuit is required to be capable of completely isolating crosstalk caused by a charging circuit, such as conduction and surge, and clean and stable electric energy signals can be provided for electric equipment.
The current power supply technology cannot ensure that the charger supplies power in an isolated way from the load, and cannot ensure that the switching process cannot influence the load (namely, the electric equipment) during the switching process of the battery pack, particularly the load 04 sensitive to the power supply quality.
The patent with publication number CN201910615134.7 discloses a solar double-battery switching device, which comprises a controller, a miniature stepping motor, a permanent magnet, a first reed switch, a second reed switch, a charging and discharging reed switch, a solar power generation assembly, a linkage switch, a first battery pack and a second battery pack; the first reed switch is provided with a first control end A, and the second reed switch is provided with a second control end B; the output end of the second reed switch is connected with the charge-discharge reed switch through a linked switch; the solar power generation assembly is respectively connected with the first battery pack and the second battery pack through a charging and discharging reed switch; the permanent magnet is connected with the output end of the micro stepping motor, the controller is connected with the micro stepping motor, the controller controls the micro stepping motor to run, and the permanent magnet is controlled to be connected with the first control end A of the first reed pipe or connected with the second control end B of the second reed pipe; the first battery pack is in a power supply state and the second battery pack is in a charging state by controlling the on-off state of the second reed switch; or when the first battery pack is in a charging state, the second battery pack is in a power supply state.
The patent application No. 201610738120.0 discloses a dual battery energy storage system comprising: two battery packs, a controller and a double-knife key switch; the battery pack comprises a battery pack and a battery management system; the battery management system is connected with the corresponding battery pack and is also connected with the controller; the double-knife key switch is respectively connected with the master positive ends of the two battery packs and the two battery management systems and controls the two battery management systems simultaneously; and the two battery management systems are respectively in signal connection with the controller.
The patent of application No. 201920224012.0 discloses an intelligent station power supply, which comprises a first storage battery pack, a second storage battery pack, a multi-path acquisition module, a multi-path output direct current conversion module, an intelligent control module, an alternating current charging module, a solar charging control module, a network module, a key display module and a timing and storage recording module; the intelligent control module is electrically connected with the alternating current charging module, the solar charging control module, the first storage battery pack, the second storage battery pack, the multi-path acquisition module, the multi-path output direct current conversion module, the network module, the key display module and the timing and storage recording module respectively; the multi-path acquisition module is electrically connected with the first storage battery pack, the second storage battery pack and the multi-path output direct current conversion module respectively; one end of the solar charging control module is electrically connected with the solar battery. And the alternating current charging module is provided with a lightning protection module. The network module is connected with a remote computer through a network. The button display module is provided with a button assembly, a voltage and current value area for displaying the multi-path output module and a voltage value area for inputting alternating voltage and a storage battery.
The inventor believes that the technical scheme has the following defects:
(1) the two battery packs do not realize independent charging and independent discharging, and the charging and the discharging do not realize complete electrical appliance isolation;
(2) the full charge and the full discharge of the battery cannot be guaranteed to the maximum extent;
(3) in the battery pack switching process, when the two battery packs are simultaneously disconnected for discharging, the continuous and stable operation of the load 04 cannot be guaranteed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a double-battery charging and discharging isolation power supply circuit to solve the following problems in the prior art: the two battery packs do not realize independent charging and independent discharging, and the charging and the discharging do not realize complete electrical appliance isolation; the full charge and the full discharge of the battery cannot be ensured; in the battery pack switching process, when the two battery packs are simultaneously disconnected for discharging, the continuous and stable running of the load cannot be guaranteed.
In order to achieve the purpose, the invention adopts the technical scheme that: a dual-battery charging-discharging isolated power supply circuit is provided, which comprises
The first relay, the second relay, the third relay and the fourth relay are used for charge and discharge switching of a first battery pack and a second battery pack;
a first relay drive circuit for synchronous driving of the first relay and the second relay;
a second relay drive circuit for reverse phase synchronous drive of the third relay and the fourth relay;
the super capacitor circuit is used for keeping power supply to the load in the charge-discharge switching process of the first battery pack and the second battery pack; the super capacitor circuit can prevent the super capacitor transient charging current from being too large when the first battery pack or the second battery pack is connected for the first time, and the contact arcing of the first relay, the second relay, the third relay and the fourth relay is weakened, so that the service life of the first relay, the second relay, the third relay and the fourth relay is prolonged.
The backflow prevention circuit is used for preventing the current of the load from flowing backwards to the charger;
the MCU controller is used for realizing charging and discharging switching of the first battery pack and the battery pack through the first relay drive circuit and the second relay drive circuit;
the voltage monitoring circuit is used for continuously monitoring the discharge voltage of the first battery pack and the second battery pack by the MCU controller, and when the discharge voltage of the first battery pack or the second battery pack is lower than an under-voltage point, the MCU controller is switched to the second battery pack or the first battery pack for power supply through the first relay driving circuit and the second relay driving circuit;
the first relay and the second relay are respectively electrically connected with the load, the first relay is electrically connected with the third relay, the second relay and the fourth relay are electrically connected, the third relay and the fourth relay are electrically connected with the load through the backflow prevention circuit and the super capacitor circuit, the positive pole of the first battery pack and the positive pole of the second battery pack are respectively and electrically connected with the first relay and the third relay, the negative electrode of the first battery pack and the negative electrode of the second battery pack are respectively and electrically connected with the second relay and the fourth relay, the MCU controller is electrically connected with the first relay and the second relay through the first relay driving circuit, and the MCU controller is electrically connected with the third relay and the fourth relay through the second relay driving circuit.
Further, the double-battery charging and discharging isolation power supply circuit further comprises a first anti-ignition circuit and a second anti-ignition circuit, wherein the first anti-ignition circuit is respectively connected with the first battery pack, the second relay, the fourth relay and the MCU controller electrically connected, the second anti-ignition circuit is respectively connected with the second battery pack, the second relay, the fourth relay and the MCU controller electrically connected, the first anti-ignition circuit is used for preventing the arc discharge and ignition phenomenon in the first battery pack access process, and the second anti-ignition circuit is used for preventing the arc discharge and ignition phenomenon in the second battery pack access process.
Further, the super capacitor circuit comprises a super capacitor, a diode D1 and a resistor R1; the super capacitor is of a power type and is used for keeping power supply for the load in the switching process of the first battery pack and the second battery pack; the diode D1 is used for guaranteeing the discharge capacity of the super capacitor, and the diode D1 can block the super capacitor from charging; the resistor R1 is used for charging and current limiting of the super capacitor; the anode of the diode D1 is connected with one end of the resistor R1 and then connected with one end of the super capacitor.
Further, the first relay includes a coil K1 and a contact S1, the second relay includes a coil K2 and a contact S2, the third relay includes a coil K3 and a contact S3, and the fourth relay includes a coil K4 and a contact S4; the voltage monitoring circuit comprises a capacitor C1 and resistors R24 and R25.
Further, pin 1 of the coil K1 is connected to pin 1 of the coil K2 and then connected to a circuit voltage VCC, pin 1 of the coil K3 is connected to pin 1 of the coil K4 and then connected to the circuit voltage VCC, pin 2 of the coil K1 is connected to pin 2 of the coil K2 and then connected to the first relay driving circuit, pin 2 of the coil K3 is connected to pin 2 of the coil K4 and then connected to the second relay driving circuit, the first relay driving circuit is further connected to a control signal output terminal PB0 of the MCU controller, the second relay driving circuit is further connected to a control signal output terminal PB1 of the MCU controller, pin 3 of the contact S1 is connected to the positive electrode of the charger, pin 3 of the contact S2 is connected to the negative electrode of the charger, and pin 5 of the contact S1 is connected to the positive electrode of the first battery pack and pin 5 of the contact S3, respectively, a pin 4 of the contact S1 is connected to a positive electrode of the second battery pack and a pin 4 of the contact S3, a pin 5 of the contact S2 is connected to the first anti-sparking circuit and a pin 5 of the contact S4, the first anti-sparking circuit is further connected to a positive electrode and a negative electrode of the first battery pack, a pin 4 of the contact S2 is connected to the second anti-sparking circuit and a pin 4 of the contact S4, the second anti-sparking circuit is further connected to a positive electrode and a negative electrode of the second battery pack, the first anti-sparking circuit is connected to a control signal input terminal PB2 of the MCU controller after being connected to the second anti-sparking circuit, a pin 3 of the contact S3 is connected to one end of the resistor R24 and the anti-backflow circuit, a pin 3 of the contact S4 is connected to the anti-backflow circuit, and the other end of the resistor R24 is connected to one end of the capacitor C1 and one end of the resistor R25, the other end of the resistor R25 is connected with the other end of the capacitor C1 and then connected with a control signal input end PA0 of the MCU controller, the backflow prevention circuit is connected with the other end of the super capacitor and then connected with the negative electrode of the load, the backflow prevention circuit is further connected with the negative electrode of the diode D1, and the negative electrode of the diode D1 is further connected with the other end of the resistor R1 and the positive electrode of the load respectively.
Further, the first relay driving circuit includes transistors Q85, Q86, and Q87, schottky diodes D49 and D50, diodes D44 and D48, resistors R366, R367, R370, R372, R374, and R375; the cathode of the schottky diode D49 is connected to the pin 1 of the coil K1 and the cathode of the diode D44, the anode of the schottky diode D49 is connected to the pin 2 of the coil K1 and the collector of the transistor Q85, the anode of the diode D44 is connected to the power supply 12V, the anode of the diode D44 is also connected to the anode of the diode D48, one end of the resistor R367 and one end of the resistor R366, the cathode of the diode D48 is connected to the cathode of the schottky diode D50 and the pin 1 of the coil K2, the anode of the schottky diode D50 is connected to the pin 2 of the coil K2 and the collector of the transistor Q86, the emitter of the transistor Q86 is connected to the emitter of the transistor Q85 and then grounded, and the emitter of the transistor Q85 is also connected to one end of the resistor R375, the emitter of the transistor Q89 and one end of the resistor R374, the base of the triode Q86 is connected with the base of the triode Q85 and the other end of the resistor R375 respectively, the base of the triode Q85 is also connected with one end of the resistor R370, the other end of the resistor R370 is connected with the other end of the resistor R367 and the collector of the triode Q89 respectively, the base of the triode Q89 is connected with the other end of the resistor R374, one end of the resistor R372 and the other end of the resistor R366 respectively, and the other end of the resistor R372 is connected with the control signal output end PB0 of the MCU controller.
Further, the second relay driving circuit includes transistors Q87, Q88, and Q90, schottky diodes D51 and D52, diodes D46 and D47, resistors R368, R369, R371, R373, R376, and R377; the cathode of the schottky diode D51 is connected to the pin 1 of the coil K3 and the cathode of the diode D46, the anode of the schottky diode D51 is connected to the pin 2 of the coil K3 and the collector of the transistor Q87, the anode of the diode D46 is connected to the power supply 12V, the anode of the diode D46 is connected to the anode of the diode D47, one end of the resistor R369 and one end of the resistor R368, the cathode of the diode D47 is connected to the cathode of the schottky diode D52 and the pin 1 of the coil K4, the anode of the schottky diode D52 is connected to the pin 2 of the coil K4 and the collector of the transistor Q88, the emitter of the transistor Q88 is connected to the emitter of the transistor Q87 and then grounded, and the emitter of the transistor Q87 is connected to one end of the resistor R377, the emitter of the transistor Q90 and one end of the resistor R376, the base of the triode Q88 is connected with the base of the triode Q87 and the other end of the resistor R377 respectively, the base of the triode Q87 is further connected with one end of the resistor R370, the other end of the resistor R370 is connected with the other end of the resistor R369 and the collector of the triode Q90 respectively, the base of the triode Q90 is connected with the other end of the resistor R376, one end of the resistor R373 and the other end of the resistor R368 respectively, and the other end of the resistor R373 is connected with the control signal output end PB1 of the MCU controller.
Further, the backflow prevention circuit comprises a MOS transistor Q5, triodes Q6 and Q7, diodes D2 and D3, resistors R2, R3, R4, R5, R6 and R7; one end of the resistor R2 and one end of the resistor R3 are connected to a circuit voltage, the other end of the resistor R2 is connected to a collector of the transistor Q6 and one end of the resistor R5, the other end of the resistor R5 is connected to a base of the transistor Q6, an emitter of the transistor Q6 is connected to an anode of the diode D2, a cathode of the diode D2 is connected to the pin 3 of the contact S4 and a drain of the MOS transistor Q5, a source of the MOS transistor Q5 is connected to one end of the resistor R7 and a cathode of the diode D3, a cathode of the diode D3 is further connected to the other end of the super capacitor and a cathode of the load, a gate of the MOS transistor Q5 is connected to the other end of the resistor R7 and one end of the resistor R4, one end of the resistor R5 is further connected to one end of the resistor R6, and the other end of the resistor R6 is connected to a base of the transistor Q7, the collector of the triode Q7 is respectively connected with the other end of the resistor R4 and the other end of the resistor R3, and the emitter of the triode Q7 is connected with the anode of the diode D3.
Further, the first anti-spark circuit comprises MOS transistors Q1 and Q3, a thermocouple TH1, and resistors R8 and R10; the one end of resistance R8 is connected the positive pole of first group battery, the other end of resistance R8 is connected respectively MOS pipe Q1 the gate with the one end of resistance R10, MOS pipe Q1 ' S drain electrode is connected the negative pole of first group battery, MOS pipe Q1 ' S source is connected respectively resistance R10 ' S the other end, MOS pipe Q3 ' S source and thermocouple TH1 ' S one end, MOS pipe Q3 ' S gate connection the control signal output PB2 of MCU controller, the other end of thermocouple TH1 with after MOS pipe Q3 ' S drain electrode links to each other connect the pin 5 of contact S2.
Further, the second anti-spark circuit comprises MOS transistors Q2 and Q4, a thermocouple TH2, and resistors R9 and R11; the one end of resistance R9 is connected the positive pole of first group battery, the other end of resistance R9 is connected respectively MOS pipe Q2 the grid with the one end of resistance R11, MOS pipe Q2 ' S drain electrode is connected the negative pole of first group battery, MOS pipe Q2 ' S source is connected respectively resistance R11 ' S the other end, MOS pipe Q4 ' S source and thermocouple TH2 ' S one end, MOS pipe Q4 ' S grid is connected MOS pipe Q3 ' S grid, thermocouple TH2 ' S the other end with connect after MOS pipe Q4 ' S drain electrode links to each other pin 4 of contact S4.
Compared with the prior art, the double-battery charging and discharging isolation power supply circuit provided by the invention comprises a first relay, a second relay, a third relay and a fourth relay, and is used for switching charging and discharging of a first battery pack and a second battery pack; the first relay driving circuit is used for synchronously driving the first relay and the second relay; the second relay driving circuit is used for the reverse phase synchronous driving of the third relay and the fourth relay; the super capacitor circuit is used for keeping power supply to a load in the charge-discharge switching process of the first battery pack and the second battery pack; the backflow prevention circuit is used for preventing the current of the load from flowing backwards to the charger; the MCU controller is used for realizing charging and discharging switching of the first battery pack and the battery pack through the first relay drive circuit and the second relay drive circuit; the voltage monitoring circuit is used for continuously monitoring the discharge voltage of the first battery pack and the second battery pack by the MCU controller; the invention solves the following problems in the prior art:
(1) the invention realizes that the two battery packs are respectively and independently charged and discharged, and the charging and the discharging are completely and electrically isolated; therefore, the problems that the two battery packs do not realize independent charging and independent discharging and the charging and discharging do not realize complete electrical appliance isolation in the prior art are solved;
(2) according to the invention, the residual electric quantity of the discharged battery pack is used as a switching condition through the MCU controller, so that full charge and full discharge of the battery are ensured to the maximum extent; therefore, the problem that the full charge and the full discharge of the battery can not be ensured in the prior art is solved;
(3) according to the invention, the super capacitor circuit is designed at the load end, so that the super capacitor can be used for maintaining power supply for the load when two battery packs are simultaneously disconnected and discharged in the battery pack switching process, and the continuous and stable operation of the load is ensured; therefore, the problem that in the battery pack switching process of the prior art, when two battery packs are disconnected and discharged simultaneously, the load can not be ensured to continuously and stably run is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a system block diagram of a dual-battery charging/discharging isolated power supply circuit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a dual-battery charging/discharging isolated power supply circuit according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a first relay driving circuit of a dual-battery charging/discharging isolated power supply circuit according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a second relay driving circuit of a dual-battery charging/discharging isolated power supply circuit according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a backflow prevention circuit of a dual-battery charging and discharging isolation power supply circuit according to an embodiment of the present invention.
Fig. 6 is a schematic circuit diagram of a first anti-ignition circuit of a dual-battery charging/discharging isolated power supply circuit according to an embodiment of the present invention.
Fig. 7 is a circuit schematic diagram of a second anti-ignition circuit of a dual-battery charging and discharging isolated power supply circuit according to an embodiment of the present invention.
The labels in the above figures are.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 7, the preferred embodiment of the present invention is provided.
Referring to fig. 1, the dual-battery charging/discharging isolated power supply circuit provided in this embodiment includes
The first relay 11, the second relay 12, the third relay 13 and the fourth relay 14 are used for switching charging and discharging of the first battery pack 01 and the second battery pack 02;
a first relay drive circuit 111, the first relay drive circuit 111 being used for synchronous driving of the first relay 11 and the second relay 12;
a second relay drive circuit 112, the second relay drive circuit 112 being used for reverse phase synchronous drive of the third relay 13 and the fourth relay 14;
the super capacitor circuit 114 is used for keeping power supply to the load 04 in the charge-discharge switching process of the first battery pack 01 and the second battery pack 02;
the backflow prevention circuit 113, the backflow prevention circuit 113 is used for preventing the current of the load 04 from flowing backwards to the charger 03;
the MCU controller 116 is configured to implement charge and discharge switching between the first battery pack 01 and the battery pack through the first relay driving circuit 111 and the second relay driving circuit 112 by using the MCU controller 116;
the voltage monitoring circuit 115 is used for the MCU controller 116 to continuously monitor the discharge voltage of the first battery pack 01 and the second battery pack 02, and when the discharge voltage of the first battery pack 01 or the second battery pack 02 is lower than an under-voltage point, the MCU controller 116 switches the first relay driving circuit 111 and the second relay driving circuit 112 to supply power to the second battery pack 02 or the first battery pack 01;
the first relay 11 and the second relay 12 are electrically connected with a load 04 respectively, the first relay 11 is electrically connected with a third relay 13, the second relay 12 is electrically connected with a fourth relay 14, the third relay 13 and the fourth relay 14 are electrically connected with the load 04 through a backflow prevention circuit 113 and a super capacitor circuit 114, the positive pole of the first battery pack 01 and the positive pole of the second battery pack 02 are electrically connected with the first relay 11 and the third relay 13 respectively, the negative pole of the first battery pack 01 and the negative pole of the second battery pack 02 are electrically connected with the second relay 12 and the fourth relay 14 respectively, the MCU controller 116 is electrically connected with the first relay 11 and the second relay 12 through a first relay driving circuit 111, and the MCU controller 116 is electrically connected with the third relay 13 and the fourth relay 14 through a second relay driving circuit 112.
The remaining capacity of the discharged battery pack is used as a switching condition by the MCU controller 116, when the first battery pack 01 is charged, the second battery pack 02 is discharged, and when the second battery pack 02 is discharged, the second battery pack 02 is switched to be charged, and the first battery pack 01 is discharged; when the second battery pack 02 is charged, the first battery pack 01 is discharged, and when the first battery pack 01 is discharged, the first battery pack 01 is charged and the second battery pack 02 is discharged.
The double-battery charging and discharging isolation power supply circuit comprises a first relay 11, a second relay 12, a third relay 13 and a fourth relay 14, and is used for charging and discharging switching of a first battery pack 01 and a second battery pack 02; a first relay drive circuit 111 for synchronous drive of the first relay 11 and the second relay 12; a second relay drive circuit 112 for reverse phase synchronous drive of the third relay 13 and the fourth relay 14; a super capacitor circuit 114, configured to maintain power supply to the load 04 during charge-discharge switching of the first battery pack 01 and the second battery pack 02; a backflow prevention circuit 113 for preventing the current of the load 04 from flowing backward to the charger 03; the MCU controller 116 is configured to implement charge and discharge switching between the first battery pack 01 and the battery pack through the first relay driving circuit 111 and the second relay driving circuit 112; a voltage monitoring circuit 115 for the MCU controller 116 to continuously monitor the discharge voltages of the first battery pack 01 and the second battery pack 02; thus, the present invention solves the following problems in the prior art:
(1) the invention realizes that the two battery packs are respectively and independently charged and discharged, and the charging and the discharging are completely and electrically isolated; therefore, the problems that the two battery packs do not realize independent charging and independent discharging and the charging and discharging do not realize complete electrical appliance isolation in the prior art are solved;
(2) according to the invention, the residual electric quantity of the discharged battery pack is used as a switching condition through the MCU controller, so that full charge and full discharge of the battery are ensured to the maximum extent; therefore, the problem that the full charge and the full discharge of the battery can not be ensured in the prior art is solved;
(3) according to the invention, the super capacitor circuit is designed at the load end, so that the super capacitor can be used for maintaining power supply for the load when two battery packs are simultaneously disconnected and discharged in the battery pack switching process, and the continuous and stable operation of the load is ensured; therefore, the problem that in the battery pack switching process of the prior art, when two battery packs are disconnected and discharged simultaneously, the load can not be ensured to continuously and stably run is solved.
Referring to fig. 1, as an embodiment of the present invention, a dual battery charging and discharging isolated power supply circuit further includes a first anti-ignition circuit 010 and a second anti-ignition circuit 020, the first anti-ignition circuit 010 is electrically connected to the first battery pack 01, the second relay 12, the fourth relay 14 and the MCU controller 116, the second anti-ignition circuit 020 is electrically connected to the second battery pack 02, the second relay 12, the fourth relay 14 and the MCU controller 116, the first anti-ignition circuit 010 is configured to prevent an arcing phenomenon occurring during the connection of the first battery pack 01, and the second anti-ignition circuit 020 is configured to prevent an arcing phenomenon occurring during the connection of the second battery pack 02.
Referring to fig. 2, the super capacitor circuit 114 includes a super capacitor, a diode D1, and a resistor R1; the super capacitor is of a power type and is used for keeping power supply for the load 04 in the switching process of the first battery pack 01 and the second battery pack 02; the diode D1 is used for guaranteeing the discharge capacity of the super capacitor, and the diode D1 can block the super capacitor from charging; the resistor R1 is used for charging and limiting the current of the super capacitor; the anode of the diode D1 is connected with one end of the resistor R1 and then connected with one end of the super capacitor.
As an embodiment of the present invention, the first relay 11 includes a coil K1 and a contact S1, the second relay 12 includes a coil K2 and a contact S2, the third relay 13 includes a coil K3 and a contact S3, and the fourth relay 14 includes a coil K4 and a contact S4; the voltage monitoring circuit 115 comprises a capacitor C1 and resistors R24 and R25.
Referring to fig. 2, in one embodiment of the present invention, pin 1 of coil K1 is connected to pin 1 of coil K2 to connect to circuit voltage VCC, pin 1 of coil K3 is connected to pin 1 of coil K4 to connect to circuit voltage VCC, pin 2 of coil K1 is connected to pin 2 of coil K2 to connect to first relay driver 111, pin 2 of coil K3 is connected to pin 2 of coil K4 to connect to second relay driver 112, first relay driver 111 is further connected to control signal output terminal PB0 of MCU controller 116, second relay driver 112 is further connected to control signal output terminal PB1 of MCU controller 116, pin 3 of contact S1 is connected to the positive electrode of charger 03, pin 3 of contact S2 is connected to the negative electrode of charger 03, pin 5 of contact S1 is connected to the positive electrode of first battery pack 01 and pin 5 of contact S3, and contact 4 of contact S1 is connected to the positive electrode of second battery pack 3 and contact S364, a pin 5 of the contact S2 is respectively connected with a pin 5 of the first anti-ignition circuit 010 and a pin 5 of the contact S4, the first anti-ignition circuit 010 is further connected with the anode and the cathode of the first battery pack 01, a pin 4 of the contact S2 is respectively connected with a pin 4 of the second anti-ignition circuit 020 and a pin 4 of the contact S4, the second anti-ignition circuit 020 is further connected with the anode and the cathode of the second battery pack 02, the first anti-ignition circuit 010 is connected with the second anti-ignition circuit 020 and then connected with a control signal input PB2 of the MCU controller 116, a pin 3 of the contact S3 is respectively connected with one end of a resistor R24 and a backflow prevention circuit 113, a pin 3 of the contact S4 is connected with the backflow prevention circuit 113, the other end of a resistor R24 is respectively connected with one end of a capacitor C1 and one end of a resistor R25, the other end of a resistor R25 is connected with the other end of a capacitor C1 and then connected with a control signal input PA0 of the MCU controller 116, and the backflow prevention circuit 113, the anti-backflow circuit 113 is further connected with the cathode of the diode D1, and the cathode of the diode D1 is further connected with the other end of the resistor R1 and the anode of the load 04, respectively.
As an embodiment of the present invention, referring to fig. 3, the first relay driving circuit 111 includes transistors Q85, Q86, and Q87, schottky diodes D49 and D50, diodes D44 and D48, resistors R366, R367, R370, R372, R374, and R375; the cathode of a schottky diode D49 is respectively connected with a pin 1 of a coil K1 and the cathode of a diode D44, the anode of the schottky diode D49 is respectively connected with a pin 2 of a coil K1 and the collector of a triode Q85, the anode of a diode D44 is connected with a power supply 12V, the anode of a diode D44 is also respectively connected with the anode of a diode D48, one end of a resistor R367 and one end of a resistor R366, the cathode of a diode D48 is respectively connected with the cathode of a schottky diode D50 and the pin 1 of the coil K2, the anode of a schottky diode D50 is respectively connected with the pin 2 of the coil K2 and the collector of a triode Q86, the emitter of a triode Q86 is connected with the emitter of a triode Q85 and then grounded, the emitter of a triode Q84 is respectively connected with one end of the resistor R375, the emitter of the triode Q89 and one end of the resistor R374, the base of a triode Q86 is respectively connected with the base of a triode Q46, the base of the triode Q85 is further connected with one end of the resistor R370, the other end of the resistor R370 is respectively connected with the other end of the resistor R367 and the collector of the triode Q89, the base of the triode Q89 is respectively connected with the other end of the resistor R374, one end of the resistor R372 and the other end of the resistor R366, and the other end of the resistor R372 is connected with the control signal output end PB0 of the MCU controller 116.
As an embodiment of the present invention, referring to fig. 4, the second relay driving circuit 112 includes transistors Q87, Q88, and Q90, schottky diodes D51 and D52, diodes D46 and D47, resistors R368, R369, R371, R373, R376, and R377; the cathode of a schottky diode D51 is respectively connected with a pin 1 of a coil K3 and the cathode of a diode D46, the anode of the schottky diode D51 is respectively connected with a pin 2 of a coil K3 and the collector of a triode Q87, the anode of a diode D46 is connected with a power supply 12V, the anode of a diode D46 is also respectively connected with the anode of a diode D47, one end of a resistor R369 and one end of a resistor R368, the cathode of a diode D47 is respectively connected with the cathode of a schottky diode D52 and the pin 1 of a coil K4, the anode of a schottky diode D52 is respectively connected with a pin 2 of a coil K4 and the collector of a triode Q88, the emitter of a triode Q88 is connected with the emitter of a triode Q87 and then grounded, the emitter of a triode Q84 is respectively connected with one end of a resistor R377, the emitter of a triode Q90 and one end of a resistor R376, the base of a triode Q88 is respectively connected with the base of a triode Q, the base of the triode Q87 is further connected with one end of a resistor R370, the other end of the resistor R370 is respectively connected with the other end of a resistor R369 and the collector of the triode Q90, the base of the triode Q90 is respectively connected with the other end of a resistor R376, one end of a resistor R373 and the other end of a resistor R368, and the other end of the resistor R373 is connected with a control signal output end PB1 of the MCU controller 116.
Referring to fig. 5, the backflow prevention circuit 113 includes a MOS transistor Q5, transistors Q6 and Q7, diodes D2 and D3, resistors R2, R3, R4, R5, R6, and R7; one end of the resistor R2 and one end of the resistor R3 are connected to a circuit voltage, the other end of the resistor R2 is connected to a collector of the transistor Q6 and one end of the resistor R5, the other end of the resistor R5 is connected to a base of the transistor Q6, an emitter of the transistor Q6 is connected to an anode of the diode D2, a cathode of the diode D2 is connected to the pin 3 of the contact S4 and a drain of the MOS transistor Q5, a source of the MOS transistor Q5 is connected to one end of the resistor R7 and a cathode of the diode D3, a cathode of the diode D3 is connected to the other end of the super capacitor and a cathode of the load 04, a gate of the MOS transistor Q3 is connected to the other end of the resistor R3 and one end of the resistor R3, one end of the resistor R3 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to a base of the transistor Q3, and an emitter of the diode D3 is connected to an anode of the diode D36.
As an embodiment of the present invention, referring to fig. 6, the first ignition prevention circuit 010 includes MOS transistors Q1 and Q3, a thermocouple TH1, resistors R8 and R10; one end of the resistor R8 is connected with the anode of the first battery pack 01, the other end of the resistor R8 is connected with the gate of the MOS transistor Q1 and one end of the resistor R10 respectively, the drain of the MOS transistor Q1 is connected with the cathode of the first battery pack 01, the source of the MOS transistor Q1 is connected with the other end of the resistor R10, the source of the MOS transistor Q3 and one end of the thermocouple TH1 respectively, the gate of the MOS transistor Q3 is connected with the control signal output end PB2 of the MCU controller 116, and the other end of the thermocouple TH1 is connected with the drain of the MOS transistor Q3 and then connected with the pin 5 of the contact S2.
As an embodiment of the present invention, referring to fig. 7, the second arcing prevention circuit 020 includes MOS transistors Q2 and Q4, a thermocouple TH2, resistors R9 and R11; one end of the resistor R9 is connected with the anode of the first battery pack 01, the other end of the resistor R9 is respectively connected with the grid of the MOS transistor Q2 and one end of the resistor R11, the drain of the MOS transistor Q2 is connected with the cathode of the first battery pack 01, the source of the MOS transistor Q2 is respectively connected with the other end of the resistor R11, the source of the MOS transistor Q4 and one end of the thermocouple TH2, the grid of the MOS transistor Q4 is connected with the grid of the MOS transistor Q3, and the other end of the thermocouple TH2 is connected with the drain of the MOS transistor Q4 and then connected with the pin 4 of the contact S4.
In summary, the present invention has the following significant advantages: the damage of the electric equipment caused by factors such as lightning and the like is effectively reduced; the activity of the battery is stimulated to the maximum extent; the power supply power quality of the load is guaranteed, and the switching process is stable and reliable; two group battery are mutual backups, not only reduce the loss because of the group battery trouble brings, can change the group battery with electricity in order to ensure the load and keep running in addition.
The embodiments of the present invention have been described in detail, but the invention is not limited to the embodiments, and those skilled in the art can make many equivalent modifications or substitutions without departing from the spirit of the present invention, and the equivalents or substitutions are included in the scope of protection defined by the claims of the present application.
Claims (10)
1. A dual-battery charging and discharging isolated power supply circuit is characterized by comprising
The first relay, the second relay, the third relay and the fourth relay are used for charge and discharge switching of a first battery pack and a second battery pack;
a first relay drive circuit for synchronous driving of the first relay and the second relay;
a second relay drive circuit for reverse phase synchronous drive of the third relay and the fourth relay;
the super capacitor circuit is used for keeping power supply to the load in the charge-discharge switching process of the first battery pack and the second battery pack;
the backflow prevention circuit is used for preventing the current of the load from flowing backwards to the charger;
the MCU controller is used for realizing charging and discharging switching of the first battery pack and the battery pack through the first relay drive circuit and the second relay drive circuit;
the voltage monitoring circuit is used for continuously monitoring the discharge voltage of the first battery pack and the second battery pack by the MCU controller, and when the discharge voltage of the first battery pack or the second battery pack is lower than an under-voltage point, the MCU controller is switched to the second battery pack or the first battery pack for power supply through the first relay driving circuit and the second relay driving circuit;
the first relay and the second relay are respectively electrically connected with the load, the first relay is electrically connected with the third relay, the second relay and the fourth relay are electrically connected, the third relay and the fourth relay are electrically connected with the load through the backflow prevention circuit and the super capacitor circuit, the positive pole of the first battery pack and the positive pole of the second battery pack are respectively and electrically connected with the first relay and the third relay, the negative electrode of the first battery pack and the negative electrode of the second battery pack are respectively and electrically connected with the second relay and the fourth relay, the MCU controller is electrically connected with the first relay and the second relay through the first relay driving circuit, and the MCU controller is electrically connected with the third relay and the fourth relay through the second relay driving circuit.
2. The dual-battery charging and discharging isolation power supply circuit according to claim 1, further comprising a first anti-ignition circuit and a second anti-ignition circuit, wherein the first anti-ignition circuit is electrically connected to the first battery pack, the second relay, the fourth relay and the MCU controller, the second anti-ignition circuit is electrically connected to the second battery pack, the second relay, the fourth relay and the MCU controller, the first anti-ignition circuit is used for preventing the arc discharge and ignition phenomenon during the connection of the first battery pack, and the second anti-ignition circuit is used for preventing the arc discharge and ignition phenomenon during the connection of the second battery pack.
3. The dual-battery charging-discharging isolation power supply circuit as claimed in claim 2, wherein the super capacitor circuit comprises a super capacitor, a diode D1 and a resistor R1; the super capacitor is of a power type and is used for keeping power supply for the load in the switching process of the first battery pack and the second battery pack; the diode D1 is used for guaranteeing the discharge capacity of the super capacitor, and the diode D1 can block the super capacitor from charging; the resistor R1 is used for charging and current limiting of the super capacitor; the anode of the diode D1 is connected with one end of the resistor R1 and then connected with one end of the super capacitor.
4. The dual battery charging and discharging isolated power supply circuit of claim 3, wherein said first relay comprises coil K1 and contact S1, said second relay comprises coil K2 and contact S2, said third relay comprises coil K3 and contact S3, said fourth relay comprises coil K4 and contact S4; the voltage monitoring circuit comprises a capacitor C1 and resistors R24 and R25.
5. The dual-battery charging and discharging isolation power supply circuit according to claim 4, wherein a pin 1 of the coil K1 is connected with a pin 1 of the coil K2 to connect to a circuit voltage VCC, a pin 1 of the coil K3 is connected with a pin 1 of the coil K4 to connect to the circuit voltage VCC, a pin 2 of the coil K1 is connected with a pin 2 of the coil K2 to connect to the first relay driving circuit, a pin 2 of the coil K3 is connected with a pin 2 of the coil K4 to connect to the second relay driving circuit, the first relay driving circuit is further connected to a control signal output terminal PB0 of the MCU controller, the second relay driving circuit is further connected to a control signal output terminal PB1 of the MCU controller, a pin 3 of the contact S1 is connected to an anode of the charger, and a pin 3 of the contact S2 is connected to a cathode of the charger, a pin 5 of the contact S1 is connected with a positive electrode of the first battery pack and a pin 5 of the contact S3 respectively, a pin 4 of the contact S1 is connected with a positive electrode of the second battery pack and a pin 4 of the contact S3 respectively, a pin 5 of the contact S2 is connected with a pin 5 of the first anti-sparking circuit and a pin 4 of the contact S4 respectively, the first anti-sparking circuit is further connected with a positive electrode and a negative electrode of the first battery pack, a pin 4 of the contact S2 is connected with a pin 4 of the second anti-sparking circuit and a pin 4 of the contact S4 respectively, the second anti-sparking circuit is further connected with a positive electrode and a negative electrode of the second battery pack, the first anti-sparking circuit is connected with the second anti-sparking circuit and then connected with a control signal input end PB2 of the MCU controller, and a pin 3 of the contact S3 is connected with one end of the resistor R24 and the anti-sparking circuit respectively, the pin 3 of the contact S4 is connected with the backflow prevention circuit, the other end of the resistor R24 is connected with one end of the capacitor C1 and one end of the resistor R25 respectively, the other end of the resistor R25 is connected with the other end of the capacitor C1 and then is connected with a control signal input end PA0 of the MCU controller, the backflow prevention circuit is connected with the other end of the super capacitor and then is connected with the negative electrode of the load, the backflow prevention circuit is further connected with the negative electrode of the diode D1, and the negative electrode of the diode D1 is further connected with the other end of the resistor R1 and the positive electrode of the load respectively.
6. The dual-battery charging and discharging isolation power supply circuit as claimed in claim 5, wherein the first relay driving circuit comprises transistors Q85, Q86 and Q87, Schottky diodes D49 and D50, diodes D44 and D48, resistors R366, R367, R370, R372, R374 and R375; the cathode of the schottky diode D49 is connected to the pin 1 of the coil K1 and the cathode of the diode D44, the anode of the schottky diode D49 is connected to the pin 2 of the coil K1 and the collector of the transistor Q85, the anode of the diode D44 is connected to the power supply 12V, the anode of the diode D44 is also connected to the anode of the diode D48, one end of the resistor R367 and one end of the resistor R366, the cathode of the diode D48 is connected to the cathode of the schottky diode D50 and the pin 1 of the coil K2, the anode of the schottky diode D50 is connected to the pin 2 of the coil K2 and the collector of the transistor Q86, the emitter of the transistor Q86 is connected to the emitter of the transistor Q85 and then grounded, and the emitter of the transistor Q85 is also connected to one end of the resistor R375, the emitter of the transistor Q89 and one end of the resistor R374, the base of the triode Q86 is connected with the base of the triode Q85 and the other end of the resistor R375 respectively, the base of the triode Q85 is also connected with one end of the resistor R370, the other end of the resistor R370 is connected with the other end of the resistor R367 and the collector of the triode Q89 respectively, the base of the triode Q89 is connected with the other end of the resistor R374, one end of the resistor R372 and the other end of the resistor R366 respectively, and the other end of the resistor R372 is connected with the control signal output end PB0 of the MCU controller.
7. The dual-battery charging and discharging isolation power supply circuit as claimed in claim 5, wherein the second relay driving circuit comprises transistors Q87, Q88 and Q90, Schottky diodes D51 and D52, diodes D46 and D47, resistors R368, R369, R371, R373, R376 and R377; the cathode of the schottky diode D51 is connected to the pin 1 of the coil K3 and the cathode of the diode D46, the anode of the schottky diode D51 is connected to the pin 2 of the coil K3 and the collector of the transistor Q87, the anode of the diode D46 is connected to the power supply 12V, the anode of the diode D46 is connected to the anode of the diode D47, one end of the resistor R369 and one end of the resistor R368, the cathode of the diode D47 is connected to the cathode of the schottky diode D52 and the pin 1 of the coil K4, the anode of the schottky diode D52 is connected to the pin 2 of the coil K4 and the collector of the transistor Q88, the emitter of the transistor Q88 is connected to the emitter of the transistor Q87 and then grounded, and the emitter of the transistor Q87 is connected to one end of the resistor R377, the emitter of the transistor Q90 and one end of the resistor R376, the base of the triode Q88 is connected with the base of the triode Q87 and the other end of the resistor R377 respectively, the base of the triode Q87 is further connected with one end of the resistor R370, the other end of the resistor R370 is connected with the other end of the resistor R369 and the collector of the triode Q90 respectively, the base of the triode Q90 is connected with the other end of the resistor R376, one end of the resistor R373 and the other end of the resistor R368 respectively, and the other end of the resistor R373 is connected with the control signal output end PB1 of the MCU controller.
8. The dual-battery charging and discharging isolation power supply circuit as claimed in claim 5, wherein the anti-backflow circuit comprises a MOS transistor Q5, transistors Q6 and Q7, diodes D2 and D3, resistors R2, R3, R4, R5, R6 and R7; one end of the resistor R2 and one end of the resistor R3 are connected to a circuit voltage, the other end of the resistor R2 is connected to a collector of the transistor Q6 and one end of the resistor R5, the other end of the resistor R5 is connected to a base of the transistor Q6, an emitter of the transistor Q6 is connected to an anode of the diode D2, a cathode of the diode D2 is connected to the pin 3 of the contact S4 and a drain of the MOS transistor Q5, a source of the MOS transistor Q5 is connected to one end of the resistor R7 and a cathode of the diode D3, a cathode of the diode D3 is further connected to the other end of the super capacitor and a cathode of the load, a gate of the MOS transistor Q5 is connected to the other end of the resistor R7 and one end of the resistor R4, one end of the resistor R5 is further connected to one end of the resistor R6, and the other end of the resistor R6 is connected to a base of the transistor Q7, the collector of the triode Q7 is respectively connected with the other end of the resistor R4 and the other end of the resistor R3, and the emitter of the triode Q7 is connected with the anode of the diode D3.
9. The dual-battery charging and discharging isolation power supply circuit as claimed in claim 5, wherein the first anti-spark circuit comprises MOS transistors Q1 and Q3, a thermocouple TH1, and resistors R8 and R10; the one end of resistance R8 is connected the positive pole of first group battery, the other end of resistance R8 is connected respectively MOS pipe Q1 the gate with the one end of resistance R10, MOS pipe Q1 ' S drain electrode is connected the negative pole of first group battery, MOS pipe Q1 ' S source is connected respectively resistance R10 ' S the other end, MOS pipe Q3 ' S source and thermocouple TH1 ' S one end, MOS pipe Q3 ' S gate connection the control signal output PB2 of MCU controller, the other end of thermocouple TH1 with after MOS pipe Q3 ' S drain electrode links to each other connect the pin 5 of contact S2.
10. The dual-battery charging and discharging isolation power supply circuit as claimed in claim 9, wherein the second anti-spark circuit comprises MOS transistors Q2 and Q4, a thermocouple TH2, and resistors R9 and R11; the one end of resistance R9 is connected the positive pole of first group battery, the other end of resistance R9 is connected respectively MOS pipe Q2 the grid with the one end of resistance R11, MOS pipe Q2 ' S drain electrode is connected the negative pole of first group battery, MOS pipe Q2 ' S source is connected respectively resistance R11 ' S the other end, MOS pipe Q4 ' S source and thermocouple TH2 ' S one end, MOS pipe Q4 ' S grid is connected MOS pipe Q3 ' S grid, thermocouple TH2 ' S the other end with connect after MOS pipe Q4 ' S drain electrode links to each other pin 4 of contact S4.
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| CN202011125869.0A CN112202228A (en) | 2020-10-20 | 2020-10-20 | Double cell charge-discharge isolation power supply circuit |
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| CN202011125869.0A CN112202228A (en) | 2020-10-20 | 2020-10-20 | Double cell charge-discharge isolation power supply circuit |
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