CN220457144U - Battery charging and discharging system - Google Patents
Battery charging and discharging system Download PDFInfo
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- CN220457144U CN220457144U CN202321616805.XU CN202321616805U CN220457144U CN 220457144 U CN220457144 U CN 220457144U CN 202321616805 U CN202321616805 U CN 202321616805U CN 220457144 U CN220457144 U CN 220457144U
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- 238000007599 discharging Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The utility model relates to the technical field of storage battery charging and discharging systems, and provides a battery charging and discharging system, which comprises a main control unit and a charging circuit, wherein the charging circuit comprises a converter U1, a switch tube Q3, a transformer T1, a resistor R4 and a resistor R5, the input end of the converter U1 is connected with the main control unit, the output end of the converter U1 is connected with the control end of the switch tube Q3, the first end of the switch tube Q3 is connected with the first input end of the transformer T1, the second input end of the transformer T1 is connected with the power end of the converter U1, the second end of the switch tube Q3 is connected with the current detection end of the converter U1, the first output end of the transformer T1 is connected with the positive electrode of the storage battery U2, the negative electrode of the storage battery U2 is grounded, the first end of the resistor R4 is connected with the positive electrode of the storage battery U2, the second end of the resistor R4 is grounded through the resistor R5, and the second end of the resistor R4 is connected with the voltage detection end of the converter U1. Through above-mentioned technical scheme, the complicated problem of circuit structure of battery charging circuit among the prior art has been solved.
Description
Technical Field
The utility model relates to the technical field of storage battery charging, in particular to a battery charging and discharging system.
Background
The storage battery is used as a chemical power supply with reliable performance, is widely applied to the industrial fields of power systems, transportation, portable electronic products and the like, a charging and discharging circuit of the storage battery is used for controlling the power supply to charge the storage battery and the storage battery to supply power to a load, and in the charging process, the charging circuit of the storage battery is disconnected if the storage battery is fully charged so as to prevent the storage battery from being overcharged, but the conventional storage battery charging circuit has a complex circuit structure, large occupied space and inconvenient use.
Disclosure of Invention
The utility model provides a battery charging and discharging system, which solves the problem of complex circuit structure of a storage battery charging circuit in the prior art.
The technical scheme of the utility model is as follows:
the battery charging and discharging system comprises a main control unit and a charging circuit, wherein the main control unit is connected with the charging circuit, the charging circuit comprises a converter U1, a resistor R2, a switch tube Q3, a resistor R3, a transformer T1, a diode D2, a resistor R4 and a resistor R5, the input end of the converter U1 is connected with the first output end of the main control unit, the power end of the converter U1 is connected with a 5V power supply through a normally closed contact of a relay K1, the output end of the converter U1 is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the control end of the switch tube Q3, the first end of the switch tube Q3 is connected with the first input end of the transformer T1, the second input end of the transformer T1 is connected with the power end of the converter U1, the second end of the switch tube Q3 is grounded through the resistor R3, the second end of the switch tube Q3 is connected with the current detection end of the converter U1,
the first output end of the transformer T1 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the storage battery U2 to be the anode, the cathode of the storage battery U2 is grounded, the second output end of the transformer T1 is grounded, the first end of the resistor R4 is connected with the anode of the storage battery U2, the second end of the resistor R4 is grounded through the resistor R5, and the second end of the resistor R4 is connected with the voltage detection end of the converter U1.
Further, the utility model also comprises a power shutoff circuit, wherein the power shutoff circuit comprises a resistor R7, a resistor R8, an operational amplifier U3, an operational amplifier U4, a resistor R9 and a switch tube Q4, the in-phase input end of the operational amplifier U3 is connected with the second end of the resistor R4, the first end of the resistor R8 is connected with a 5V power supply, the second end of the resistor R8 is grounded through the resistor R7, the inverting input end of the operational amplifier U3 is connected with the second end of the resistor R8, the output end of the operational amplifier U3 is connected with the in-phase input end of the operational amplifier U4, the output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U4, the output end of the operational amplifier U4 is connected with the control end of the switch tube Q4 through the resistor R9, the first end of the switch tube Q4 is connected with the first input end of the relay K1, and the second end of the relay K1 is connected with the 5V power supply.
Further, the utility model also comprises a power shutoff circuit, wherein the power shutoff circuit comprises a resistor R7, a resistor R8, an operational amplifier U3, an operational amplifier U4, a resistor R9 and a switch tube Q4, the in-phase input end of the operational amplifier U3 is connected with the second end of the resistor R4, the first end of the resistor R8 is connected with a 5V power supply, the second end of the resistor R8 is grounded through the resistor R7, the inverting input end of the operational amplifier U3 is connected with the second end of the resistor R8, the output end of the operational amplifier U3 is connected with the in-phase input end of the operational amplifier U4, the output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U4, the output end of the operational amplifier U4 is connected with the control end of the switch tube Q4 through the resistor R9, the first end of the switch tube Q4 is connected with the first input end of the relay K1, and the second end of the relay K1 is connected with the 5V power supply.
Further, the utility model also comprises a leakage detection circuit, wherein the leakage detection circuit comprises an optocoupler U5, an optocoupler U6, a resistor R13 and a current sensor P1, wherein a first input end of the optocoupler U5 is connected with a 5V power supply, a second input end of the optocoupler U5 is connected with a second output end of the main control unit, a first output end of the optocoupler U5 is connected with the 5V power supply, a second output end of the optocoupler U5 is connected with a first end of the current sensor P1, a second end of the current sensor P1 is connected with a first input end of the optocoupler U6, a second input end of the optocoupler U6 is grounded, a first output end of the optocoupler U6 is connected with the 5V power supply through the resistor R13, a first output end of the optocoupler U6 is connected with a first input end of the main control unit, and a second output end of the optocoupler U6 is grounded.
Further, the utility model also comprises an over-discharge protection circuit, wherein the over-discharge protection circuit comprises a resistor R15, a resistor R16, an operational amplifier U7, a resistor R14, a switching tube Q6 and a switching tube Q5, a first end of the resistor R15 is connected with a 5V power supply, a second end of the resistor R15 is grounded through the resistor R16, an inverting input end of the operational amplifier U7 is connected with a second end of the resistor R15, a non-inverting input end of the operational amplifier U7 is connected with the positive electrode of the storage battery U2, an output end of the operational amplifier U7 is connected with a control end of the switching tube Q6 through the resistor R14, a first end of the switching tube Q6 is connected with a control end of the switching tube Q5, a second end of the switching tube Q6 is grounded, a first end of the switching tube Q5 is connected with the positive electrode of the storage battery U2, a second end of the switching tube Q5 is connected with a first end of a load RL, and a second end of the load RL is grounded.
The working principle and the beneficial effects of the utility model are as follows:
in the utility model, the 5V power supply is a direct current power supply, the 5V direct current power supply charges the storage battery U2 after passing through the charging circuit, and the working principle of the charging circuit is as follows:
when the storage battery U2 is charged, the normally closed contact of the relay K1 is in a closed state, a 5V power supply is added to the power end of the converter U1, the converter U1 is in a working state, the main control unit outputs a PWM control signal to the input end of the converter U1, when the PWM control signal is in a high level, the converter U1 outputs a high level, and when the PWM control signal is in a low level, the converter U1 outputs a low level; when the converter U1 outputs a high level, the switching tube Q3 is conducted, the 5V power supply goes to the ground after passing through the input end of the transformer T1, the switching tube Q3 and the resistor R3 in sequence, at this time, the output end of the transformer T1 generates induction voltage, and the voltage output by the transformer T1 charges the storage battery U2 after passing through the diode D2; when the inverter U1 outputs a low level, the switching tube Q3 is turned off, the output terminal of the transformer T1 has no voltage, the battery U2 stops charging, and when the output terminal of the inverter U1 becomes a high level again, the battery U2 is charged again, thereby forming a cycle.
The resistor R3 is a sampling resistor of the switching tube Q3, and is used for collecting the current flowing through the switching tube Q3, when the current flowing through the switching tube Q3 is too large, damage to the switching tube Q3 may be caused, for this purpose, when the current needs to be sampled, a voltage is generated on the resistor R3, the voltage signal is sent to the current detection end of the inverter U1, the current flowing through the switching tube Q3 can be judged through the voltage of the resistor R3, when the current flowing through the switching tube Q3 exceeds a set value, the inverter U1 outputs a low level signal, the switching tube Q3 is turned off, the battery U2 stops charging, and the excessive current of the switching tube Q3 is prevented from burning out components. The resistor R4 and the resistor R5 form a voltage dividing circuit, after the voltage of the storage battery U2 is divided, the voltage on the resistor R5 is taken as a reference voltage to be added to the voltage detection end of the converter U1, the higher the electric quantity of the storage battery U2 is, the higher the voltage on the resistor R5 is, when the voltage on the resistor R5 exceeds a set value, the output end of the converter U1 is changed to be low level, the storage battery U2 stops charging, and the storage battery U1 is prevented from being overcharged.
In the utility model, the circuit structure of the charging circuit is simple, so that the storage battery U2 can be overcharged and protected, meanwhile, the overlarge current flowing through the switching tube Q3 can be prevented, the working reliability of the charging circuit is improved, and the circuit is prevented from being burnt due to the overlarge current of the charging circuit.
The utility model will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a circuit diagram of a charging circuit according to the present utility model;
FIG. 2 is a circuit diagram of a power-off circuit according to the present utility model;
FIG. 3 is a circuit diagram of a leakage detection circuit according to the present utility model;
fig. 4 is a circuit diagram of the over-discharge protection circuit in the present utility model.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, this embodiment provides a battery charging and discharging system, including a main control unit and a charging circuit, the main control unit is connected to the charging circuit, the charging circuit includes converter U1, resistance R2, switch tube Q3, resistance R3, transformer T1, diode D2, resistance R4 and resistance R5, the first output of main control unit is connected to the input of converter U1, the power supply of converter U1 is connected 5V power through relay K1's normally closed contact, the first end of resistance R2 is connected to the output of converter U1, the control end of switch tube Q3 is connected to the second end of resistance R2, the first input of transformer T1 is connected to the first end of switch tube Q3, the second input of transformer T1 is connected to the power supply of converter U1, the second end of switch tube Q3 is grounded through resistance R3, the second end of switch tube Q3 is connected to the current detection end of converter U1, the positive electrode of diode D2 is connected to the anode of diode D2, the negative electrode of battery D2 is connected to the positive electrode of battery U2 is connected to the negative electrode of the second end of the battery U4, the positive electrode of the second end of resistor R4 is connected to the positive electrode of the battery R4 is connected to the negative electrode of the resistor R4.
In this embodiment, the 5V power supply is a dc power supply, and the 5V dc power supply charges the storage battery U2 after passing through the charging circuit, and specifically, the working principle of the charging circuit is as follows:
when the storage battery U2 is charged, the normally closed contact of the relay K1 is in a closed state, a 5V power supply is added to the power end of the converter U1, the converter U1 is in a working state, the main control unit outputs a PWM control signal to the input end of the converter U1, when the PWM control signal is in a high level, the converter U1 outputs a high level, and when the PWM control signal is in a low level, the converter U1 outputs a low level; when the converter U1 outputs a high level, the switching tube Q3 is conducted, the 5V power supply goes to the ground after passing through the input end of the transformer T1, the switching tube Q3 and the resistor R3 in sequence, at this time, the output end of the transformer T1 generates induction voltage, and the voltage output by the transformer T1 charges the storage battery U2 after passing through the diode D2; when the inverter U1 outputs a low level, the switching tube Q3 is turned off, the output terminal of the transformer T1 has no voltage, the battery U2 stops charging, and when the output terminal of the inverter U1 becomes a high level again, the battery U2 is charged again, thereby forming a cycle.
The resistor R3 is a sampling resistor of the switching tube Q3, and is used for collecting the current flowing through the switching tube Q3, when the current flowing through the switching tube Q3 is too large, the switching tube Q3 may be damaged, for this purpose, when the current flows through the resistor R3, a voltage is generated on the resistor R3, the voltage signal is sent to a current detection end (SENSE pin) of the inverter U1, the current flowing through the switching tube Q3 can be judged through the voltage of the resistor R3, when the current flowing through the switching tube Q3 exceeds a set value, the inverter U1 outputs a low level signal, the switching tube Q3 is turned off, the battery U2 stops charging, and the current of the switching tube Q3 is prevented from being too large, and the components are burnt out. The resistor R4 and the resistor R5 form a voltage dividing circuit, after the voltage of the storage battery U2 is divided, the voltage on the resistor R5 is taken as a reference voltage to be added to a voltage detection end (VFB pin) of the converter U1, the higher the electric quantity of the storage battery U2 is, the higher the voltage on the resistor R5 is, when the voltage on the resistor R5 exceeds a set value, the output end of the converter U1 becomes low level, the storage battery U2 stops charging, and the storage battery U1 is prevented from being overcharged.
In this embodiment, the circuit structure of the charging circuit is simple, so that the charging circuit not only can carry out overcharge protection on the storage battery U2, but also can prevent the overlarge current flowing through the switching tube Q3, so that the working reliability of the charging circuit is improved, and the circuit is prevented from being burnt due to the overlarge current of the charging circuit.
In this embodiment, an NPN transistor is used as the switching transistor Q3, the base of the NPN transistor is used as the control end of the switching transistor Q3, the collector of the NPN transistor is used as the first end of the switching transistor Q3, and the emitter of the NPN transistor is used as the second end of the switching transistor Q3.
As shown in fig. 1, the charging circuit in this embodiment further includes a resistor R1, a switching tube Q1, and a switching tube Q2, where a first end of the resistor R1 is connected to an output end of the converter U1, a second end of the resistor R1 is connected to a control end of the switching tube Q1, a control end of the switching tube Q1 is connected to a control end of the switching tube Q2, a first end of the switching tube Q1 is connected to a second input end of the transformer T1, a second end of the switching tube Q1 is connected to a first end of the resistor R2, a second end of the switching tube Q1 is connected to a first end of the switching tube Q2, and a second end of the switching tube Q2 is grounded.
In this embodiment, a driving circuit is added between the output end of the converter U1 and the first end of the resistor R2, where the driving circuit is composed of the resistor R1, the switching tube Q1 and the switching tube Q2, and the switching tube Q1 and the switching tube Q2 compose a push-pull circuit, so as to improve the driving capability of the PWM control signal, and when the output level of the converter U1 is high, the switching tube Q1 is turned on, the switching tube Q2 is turned off, the first end of the switching tube Q2 is high, and the switching tube Q3 is turned on; when the output of the converter U1 is at a low level, the switching tube Q1 is turned off, the switching tube Q2 is turned on, the first end of the switching tube Q2 is at a low level, and the switching tube Q3 is turned off, wherein the resistor R1 plays a role of current limiting.
As shown in fig. 2, the embodiment further includes a power shutdown circuit, where the power shutdown circuit includes a resistor R7, a resistor R8, an operational amplifier U3, an operational amplifier U4, a resistor R9 and a switching tube Q4, where the in-phase input end of the operational amplifier U3 is connected to the second end of the resistor R4, the first end of the resistor R8 is connected to a 5V power supply, the second end of the resistor R8 is grounded through the resistor R7, the inverting input end of the operational amplifier U3 is connected to the second end of the resistor R8, the output end of the operational amplifier U3 is connected to the in-phase input end of the operational amplifier U4, the output end of the operational amplifier U4 is connected to the inverting input end of the operational amplifier U4 through the resistor R9, the first end of the switching tube Q4 is connected to the first input end of the relay K1, and the second end of the relay K1 is connected to a 5V power supply.
When the storage battery U2 is fully charged, the converter U1 and the switching tube Q2 are in a working state, even if the storage battery U2 is not charged, the charging circuit still has certain power loss, so that not only can electric energy be wasted, but also certain heat can be generated, if the temperature is too high, the aging of a circuit can be accelerated, and fire disaster can be caused, therefore, the embodiment adds a power-off circuit, and when the storage battery U2 is fully charged, the power supply of the charging circuit is disconnected, so that unnecessary power loss is reduced.
Specifically, the working principle of the power supply shutoff circuit is as follows: the voltage on the resistor R5 is taken as sampling voltage to be added to the in-phase input end of the operational amplifier U3, the resistor R7 and the resistor R8 form a voltage dividing circuit, the voltage on the resistor R7 is taken as reference voltage, when the electric quantity of the storage battery U2 does not reach a set value, the voltage of the inverting input end of the operational amplifier U3 is higher than the voltage of the in-phase input end of the operational amplifier U3, the operational amplifier U3 forms a comparison circuit, at the moment, the operational amplifier U3 outputs low level, the low level is added to the control end of the switching tube Q4 after passing through a follower formed by the operational amplifier U4, the switching tube Q4 is cut off, the relay K1 is not electrified, the normally closed contact of the relay K1 does not act, the 5V direct current power supply normally supplies power to the charging circuit, and the storage battery U2 can be normally charged; when the electric quantity of the storage battery U2 reaches a set value, the voltage of the inverting input end of the operational amplifier U3 is lower than the voltage of the non-inverting input end of the operational amplifier U3, the operational amplifier U3 outputs a high level, the high level is added to the control end of the switching tube Q4 after passing through the follower, the switching tube Q4 is conducted, the relay K1 is electrified and closed, the normally open contact of the relay K1 is disconnected, the 5V direct current power supply does not supply power for the charging circuit any more, at the moment, the whole charging circuit does not have extra power loss, electric energy is saved, and meanwhile, the heating of the circuit is reduced.
As shown in fig. 3, the embodiment further includes a leakage detection circuit, where the leakage detection circuit includes an optocoupler U5, an optocoupler U6, a resistor R13, and a current sensor P1, where a first input end of the optocoupler U5 is connected to a 5V power supply, a second input end of the optocoupler U5 is connected to a second output end of the master control unit, a first output end of the optocoupler U5 is connected to a 5V power supply, a second output end of the optocoupler U5 is connected to a first end of the current sensor P1, a second end of the current sensor P1 is connected to a first input end of the optocoupler U6, a second input end of the optocoupler U6 is grounded, a first output end of the optocoupler U6 is connected to the 5V power supply through the resistor R13, a first output end of the optocoupler U6 is connected to a first input end of the master control unit, and a second output end of the optocoupler U6 is grounded.
In the long-term working process of the charging circuit, the circuit may be aged, so that no electric leakage may occur in the circuit, and the electric leakage detection circuit is added in the embodiment, no matter the storage battery U2 or the whole circuit is influenced, in the charging process, the main control unit outputs a low-level signal to the second input end of the optocoupler U5, the optocoupler U5 is conducted, the current sensor P1 starts to work, when the electric leakage current is detected, the current sensor P1 outputs current to the first input end of the optocoupler U6, the optocoupler U6 is conducted, and at the moment, the optocoupler U6 outputs a low-level signal to the main control unit; when no electric leakage occurs, the optical coupler U6 is cut off, and the optical coupler U6 outputs a high-level signal to the main control unit. The main control unit judges whether the charging circuit has electric leakage or not through the received signals.
As shown in fig. 4, the embodiment further includes an over-discharge protection circuit, where the over-discharge protection circuit includes a resistor R15, a resistor R16, an operational amplifier U7, a resistor R14, a switching tube Q6 and a switching tube Q5, where a first end of the resistor R15 is connected to a 5V power supply, a second end of the resistor R15 is grounded through the resistor R16, an inverting input end of the operational amplifier U7 is connected to a second end of the resistor R15, an non-inverting input end of the operational amplifier U7 is connected to a positive electrode of the battery U2, an output end of the operational amplifier U7 is connected to a control end of the switching tube Q6 through the resistor R14, a first end of the switching tube Q6 is connected to a control end of the switching tube Q5, a second end of the switching tube Q6 is grounded, a first end of the switching tube Q5 is connected to a positive electrode of the battery U2, a second end of the switching tube Q5 is connected to a first end of the load RL, and a second end of the load RL is grounded.
In the discharging process of the storage battery U2, if the over-discharging condition occurs, the influence on the noise of the storage battery is also reduced, thereby reducing the service life of the storage battery, an over-discharging protection circuit is further arranged in the embodiment, the in-phase input end of the operational amplifier U7 is used for detecting the voltage of the storage battery, the operational amplifier U7 forms a comparison circuit, the resistor R15 and the resistor R16 form partial voltage, the voltage on the resistor R16 is used as the reference voltage of the inverting input end of the operational amplifier U7, when the voltage of the storage battery U2 is higher than a set value, the operational amplifier U7 outputs a high level, the switching tube Q6 is conducted, the control end of the switching tube Q5 is low, the switching tube Q5 is conducted, the anode of the storage battery U2 is connected with a load RL to supply power, when the voltage of the storage battery U2 is lower than the set value, the operational amplifier U7 outputs a low level, the switching tube Q6 is cut off, and the storage battery U2 is not supplied with power any more, thereby avoiding the over-discharging of the storage battery U2 and playing a role of protecting the storage battery U2.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. The battery charging and discharging system is characterized by comprising a main control unit and a charging circuit, wherein the main control unit is connected with the charging circuit, the charging circuit comprises a converter U1, a resistor R2, a switch tube Q3, a resistor R3, a transformer T1, a diode D2, a resistor R4 and a resistor R5, the input end of the converter U1 is connected with the first output end of the main control unit, the power end of the converter U1 is connected with a 5V power supply through a normally closed contact of a relay K1, the output end of the converter U1 is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the control end of the switch tube Q3, the first end of the switch tube Q3 is connected with the first input end of the transformer T1, the second input end of the transformer T1 is connected with the power end of the converter U1, the second end of the switch tube Q3 is grounded through the resistor R3, the second end of the switch tube Q3 is connected with the current detection end of the converter U1,
the first output end of the transformer T1 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the storage battery U2 to be the anode, the cathode of the storage battery U2 is grounded, the second output end of the transformer T1 is grounded, the first end of the resistor R4 is connected with the anode of the storage battery U2, the second end of the resistor R4 is grounded through the resistor R5, and the second end of the resistor R4 is connected with the voltage detection end of the converter U1.
2. The battery charging and discharging system according to claim 1, wherein the charging circuit further comprises a resistor R1, a switching tube Q1 and a switching tube Q2, a first end of the resistor R1 is connected to the output end of the inverter U1, a second end of the resistor R1 is connected to the control end of the switching tube Q1, a control end of the switching tube Q1 is connected to the control end of the switching tube Q2, a first end of the switching tube Q1 is connected to the second input end of the transformer T1, a second end of the switching tube Q1 is connected to the first end of the resistor R2, a second end of the switching tube Q1 is connected to the first end of the switching tube Q2, and a second end of the switching tube Q2 is grounded.
3. The battery charge-discharge system according to claim 1, further comprising a power-off circuit, wherein the power-off circuit comprises a resistor R7, a resistor R8, an operational amplifier U3, an operational amplifier U4, a resistor R9 and a switching tube Q4, wherein the non-inverting input end of the operational amplifier U3 is connected with the second end of the resistor R4, the first end of the resistor R8 is connected with a 5V power supply, the second end of the resistor R8 is grounded through the resistor R7, the inverting input end of the operational amplifier U3 is connected with the second end of the resistor R8, the output end of the operational amplifier U3 is connected with the non-inverting input end of the operational amplifier U4, the output end of the operational amplifier U4 is connected with the control end of the switching tube Q4 through the resistor R9, the first end of the switching tube Q4 is connected with the first input end of the relay K1, and the second end of the relay K1 is connected with the 5V power supply.
4. The battery charge-discharge system according to claim 1, further comprising a leakage detection circuit, wherein the leakage detection circuit comprises an optocoupler U5, an optocoupler U6, a resistor R13 and a current sensor P1, a first input end of the optocoupler U5 is connected with a 5V power supply, a second input end of the optocoupler U5 is connected with a second output end of the master control unit, a first output end of the optocoupler U5 is connected with the 5V power supply, a second output end of the optocoupler U5 is connected with a first end of the current sensor P1, a second input end of the current sensor P1 is connected with a first input end of the optocoupler U6, a second input end of the optocoupler U6 is grounded, a first output end of the optocoupler U6 is connected with the 5V power supply through the resistor R13, a first output end of the optocoupler U6 is connected with a first input end of the master control unit, and a second output end of the optocoupler U6 is grounded.
5. The battery charge-discharge system according to claim 1, further comprising an over-discharge protection circuit, wherein the over-discharge protection circuit comprises a resistor R15, a resistor R16, an operational amplifier U7, a resistor R14, a switching tube Q6 and a switching tube Q5, a first end of the resistor R15 is connected with a 5V power supply, a second end of the resistor R15 is grounded through the resistor R16, an inverting input end of the operational amplifier U7 is connected with a second end of the resistor R15, a non-inverting input end of the operational amplifier U7 is connected with a positive electrode of the battery U2, an output end of the operational amplifier U7 is connected with a control end of the switching tube Q6 through the resistor R14, a first end of the switching tube Q6 is connected with a control end of the switching tube Q5, a second end of the switching tube Q6 is grounded, a first end of the switching tube Q5 is connected with a positive electrode of the battery U2, a second end of the switching tube Q5 is connected with a first end of a load RL, and a second end of the load RL is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321616805.XU CN220457144U (en) | 2023-06-25 | 2023-06-25 | Battery charging and discharging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321616805.XU CN220457144U (en) | 2023-06-25 | 2023-06-25 | Battery charging and discharging system |
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| Publication Number | Publication Date |
|---|---|
| CN220457144U true CN220457144U (en) | 2024-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321616805.XU Active CN220457144U (en) | 2023-06-25 | 2023-06-25 | Battery charging and discharging system |
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| CN (1) | CN220457144U (en) |
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2023
- 2023-06-25 CN CN202321616805.XU patent/CN220457144U/en active Active
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