CN220291666U - Storage battery voltage detection and main loop disconnection control circuit - Google Patents
Storage battery voltage detection and main loop disconnection control circuit Download PDFInfo
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- CN220291666U CN220291666U CN202322989381.8U CN202322989381U CN220291666U CN 220291666 U CN220291666 U CN 220291666U CN 202322989381 U CN202322989381 U CN 202322989381U CN 220291666 U CN220291666 U CN 220291666U
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- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 20
- 230000015556 catabolic process Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims 2
- 230000002596 correlated effect Effects 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model provides a storage battery voltage detection and main loop disconnection control circuit, which comprises a voltage detection circuit for detecting overvoltage and undervoltage of a storage battery and a main loop disconnection control circuit for controlling relay in a storage battery charging and discharging main loop to be disconnected, wherein the voltage detection circuit is isolated from the main loop disconnection control circuit through an optical coupler and forms a control signal for exciting the connection of the main loop disconnection control circuit. The voltage detection circuit is isolated from the main loop disconnection control circuit through an optocoupler, and pure hardware circuits such as an operational amplifier, a triode, a resistor, a capacitor and the like are adopted to detect the battery voltage and protect and control the main loop, so that the speed and the stability of abnormal protection of the storage battery are improved.
Description
Technical Field
The utility model relates to a battery protection circuit, in particular to a storage battery voltage detection and main loop disconnection control circuit.
Background
Most storage batteries can be added into a battery management system when in use to prevent the storage batteries from being overcharged or overdischarged when in charging, and the traditional storage battery management system adopts a special storage battery voltage sampling chip to sample the voltage of the storage batteries and then sends the voltage information of the storage batteries to an MCU (micro controller unit) which judges whether the batteries are overcharged or overdischarged according to a voltage threshold value of the storage batteries, and when the voltage of the storage batteries is overcharged or overdischarged, the MCU controls to disconnect a main loop relay. The system has control delay or can not timely disconnect the main loop relay when the sampling chip and the MCU fail. In addition, the storage battery management system developed by combining the storage battery voltage sampling chip and the MCU is easy to suffer from electromagnetic interference in a complex electrical application environment, so that the system is unstable.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a storage battery voltage detection and main loop disconnection control circuit, which aims to improve the reaction speed and stability of the storage battery detection and control circuit and prevent system faults caused by overvoltage or undervoltage of the storage battery.
The voltage detection circuit is isolated from the main loop disconnection control circuit through an optical coupler and forms a control signal for exciting the main loop disconnection control circuit to be conducted; the main loop disconnection control circuit comprises a MOS tube Q2 and a PNP triode Q1, wherein a control signal is connected with the grid electrode of the MOS tube Q2 after passing through a resistor R10 and a breakdown diode D4, the drain electrode of the MOS tube Q2 is connected with a system power supply 12V after passing through a resistor R9 and a resistor R8 in sequence, and the source electrode of the MOS tube Q2 is grounded; the emitter of the PNP triode Q1 is connected with a system power supply 12V, the collector of the PNP triode Q1 is connected with the coil input end of the normally-closed relay K1, the base of the PNP triode Q1 is connected with the common end of a resistor R8 and a resistor R9, a capacitor C12 is connected with the resistor R8 in parallel, and the collector of the PNP triode Q1 is grounded through the resistor R14 and the resistor R16 in sequence; the normally closed relay K1 is a main loop relay for controlling the charge and discharge of the storage battery.
The method further comprises the following steps: the voltage detection circuit comprises a voltage reference source, a first operational amplifier and a second operational amplifier, wherein the positive electrode and the negative electrode of the storage battery are respectively in one-to-one correspondence with the positive electrode and the negative electrode of the voltage reference source and are connected, one branch of the voltage reference source is grounded after passing through a voltage stabilizing capacitor C9, the other branch is respectively connected with the inverting end of the first operational amplifier and the non-inverting end of the second operational amplifier, the voltage of the storage battery is input to the inverting end of the second operational amplifier after being divided by a resistor R2 and a resistor R4, and the voltage stabilizing filter capacitor C7 and the resistor R4 are connected in parallel for overvoltage detection of the storage battery; the voltage of the storage battery is divided by a resistor R5 and a resistor R7 and then is input to the same-phase end of the first operational amplifier for undervoltage detection of the storage battery, and a voltage stabilizing filter capacitor C11 is connected with the resistor R7 in parallel; the output end of the first operational amplifier is connected with the cathode of the input diode of the optical coupler U3 after passing through a diode D7 and a resistor R3, and the output end of the second operational amplifier is connected with the cathode of the input diode of the optical coupler U3 after passing through a diode D8 and a resistor R6; the collector of the triode at the output end of the optical coupler U3 is connected with the system power supply 12V, and the emitter of the triode at the output end of the optical coupler U3 is output to the main loop disconnection control circuit after passing through the diode D2.
The method further comprises the following steps: a voltage stabilizing diode D6 for stabilizing the voltage of the MOS tube Q2 is arranged in the main loop disconnection control circuit, the negative electrode end of the voltage stabilizing diode D6 is connected with the grid electrode of the MOS tube Q2, and the positive electrode of the voltage stabilizing diode D6 is grounded.
The method further comprises the following steps: a diode D3 is connected in parallel to the resistor R10.
The method further comprises the following steps: a triode Q3 is arranged in the main loop disconnection control circuit; the common end of the resistor R14 and the resistor R16 is connected with the base electrode of the triode Q3 through the resistor R15, the capacitor C1 is connected with the resistor R16 in parallel, and the collector electrode of the triode Q3 is connected with the common end of the resistor R8 and the resistor R9 through the resistor R13.
The method further comprises the following steps: a diode D5 for switching and freewheeling the normally closed relay is arranged in the main loop disconnection control circuit, the negative electrode end of the diode D5 is connected with the collector electrode of the PNP triode Q1, and the positive electrode of the diode D5 is grounded.
The utility model has the beneficial effects that: the voltage detection circuit is isolated from the main loop disconnection control circuit through an optocoupler, and pure hardware circuits such as an operational amplifier, a triode, a resistor, a capacitor and the like are adopted to detect the battery voltage and protect and control the main loop, so that the abnormal protection speed and stability of the storage battery are improved; through the cooperation of the operational amplifier and the voltage reference source, whether the storage battery is over-voltage or under-voltage is detected, and through the cooperation of the optocoupler U3/U5, the MOS tube Q2, the triode Q1, the normally closed relay K1 and the resistor and capacitor, the problem that when the storage battery is under-voltage or over-voltage, the main loop relay of the storage battery is disconnected in time is solved.
Drawings
Fig. 1 is a circuit diagram of the present utility model.
Detailed Description
The present utility model will be described in detail with reference to the accompanying drawings. Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model. The terms left, middle, right, upper, lower, etc. in the embodiments of the present utility model are merely relative concepts or references to the normal use state of the product, and should not be construed as limiting.
The utility model provides a battery voltage detection and main return circuit disconnection control circuit, includes the voltage detection circuit that is used for carrying out overvoltage and undervoltage detection to the battery and is used for controlling the main return circuit disconnection control circuit that is located battery charge-discharge main return circuit relay and cuts off, and a plurality of voltage detection circuit all keeps apart the relevance with main return circuit disconnection control circuit through the opto-coupler to form the control signal that arouses main return circuit disconnection control circuit and switch on. As shown in fig. 1, the voltage detection circuit includes a voltage reference source U4/U6, a first operational amplifier U1A/U2A and a second operational amplifier U1B/U2B, where the voltage reference source U4/U6 uses REF3012, the positive and negative poles of the storage battery are respectively corresponding to and connected to the positive and negative poles of the voltage reference source U4/U6, one branch of the voltage reference source U4 is grounded after passing through a voltage stabilizing capacitor C9, the other branch is respectively connected to the inverting terminal of the first operational amplifier U2A and the non-inverting terminal of the second operational amplifier U2B, the voltage of the storage battery is divided by a resistor R2 and a resistor R4 and then input to the inverting terminal of the second operational amplifier U2B for overvoltage detection of the storage battery, and the voltage stabilizing filter capacitor C7 is connected in parallel with the resistor R4; the voltage of the storage battery is divided by a resistor R5 and a resistor R7 and then is input to the same-phase end of the first operational amplifier U2A for undervoltage detection of the storage battery, and a voltage stabilizing filter capacitor C11 is connected with the resistor R7 in parallel; the output end of the first operational amplifier U2A is connected with the cathode of an input diode of the optical coupler U3 after passing through a diode D7 and a resistor R3, and the output end of the second operational amplifier U2B is connected with the cathode of the input diode of the optical coupler U3 after passing through a diode D8 and a resistor R6; the collector of the triode at the output end of the optical coupler U3 is connected with the system power supply 12V, and the emitter of the triode at the output end of the optical coupler U3 is output to the main loop disconnection control circuit after passing through the diode D2.
The main loop disconnection control circuit comprises a MOS tube Q2 and a PNP triode Q1, wherein a control signal is connected with the grid electrode of the MOS tube Q2 after passing through a resistor R10 and a breakdown diode D4, the drain electrode of the MOS tube Q2 is connected with a system power supply 12V after passing through a resistor R9 and a resistor R8 in sequence, and the source electrode of the MOS tube Q2 is grounded; the emitter of the PNP triode Q1 is connected with a system power supply 12V, the collector of the PNP triode Q1 is connected with the coil input end of the normally-closed relay K1, the base of the PNP triode Q1 is connected with the common end of a resistor R8 and a resistor R9, a capacitor C12 is connected with the resistor R8 in parallel, and the collector of the PNP triode Q1 is grounded through the resistor R14 and the resistor R16 in sequence; the normally closed relay K1 is a main loop relay used for controlling the charge and discharge of the storage battery; a voltage stabilizing diode D6 for stabilizing the voltage of the MOS tube Q2 is arranged in the main loop disconnection control circuit, the negative electrode end of the voltage stabilizing diode D6 is connected with the grid electrode of the MOS tube Q2, and the positive electrode of the voltage stabilizing diode D6 is grounded; a diode D3 is connected in parallel to the resistor R10. The breakdown diode D4 is connected in series in the main loop disconnection control circuit, when the driving voltage reaches above the clamping voltage of the breakdown diode D4, the breakdown diode D4 can be broken down and conducted, the breakdown diode D4 plays an anti-interference role in the circuit, and short-time interference pulses and other abnormal signals are prevented from triggering the protection circuit by mistake.
In addition, a triode Q3 is arranged in the main loop disconnection control circuit; the common end of the resistor R14 and the resistor R16 is connected with the base electrode of the triode Q3 through the resistor R15, the capacitor C1 is connected with the resistor R16 in parallel, and the collector electrode of the triode Q3 is connected with the common end of the resistor R8 and the resistor R9 through the resistor R13. The main loop disconnection control circuit is provided with a diode D5 for switching and freewheeling the normally closed relay, the negative electrode end of the diode D5 is connected with the collector electrode of the PNP triode Q1, the positive electrode of the diode D5 is grounded, and therefore the electric quantity in the parasitic capacitance of the grid electrode can be timely discharged after the MOS tube Q2 is closed.
When the voltage detection circuit is used, after the voltage detection circuit is connected in, the voltage of the storage battery is divided by the resistor R2 and the resistor R4 and then is input to the inverting terminal of the second operational amplifier U2B, the voltage is divided by the resistor R5 and the resistor R7 and then is input to the non-inverting terminal of the first operational amplifier U2A, and in the charging process of the storage battery, when the input voltage of the inverting terminal of the second operational amplifier U2B is larger than the reference voltage of the non-inverting terminal of the second operational amplifier U2B along with the voltage rise of the storage battery, the output voltage of the second operational amplifier U2B is turned from high level to low level; in the boosting process, the output voltage of the first operational amplifier U2A keeps the high level unchanged; in the discharging process of the storage battery, along with the voltage reduction of the storage battery, when the input voltage of the non-inverting terminal of the first operational amplifier U2A is smaller than the reference voltage of the inverting terminal of the first operational amplifier U2A, the output voltage of the first operational amplifier U2A is turned from high level to low level; during the step-down process, the output voltage of the second operational amplifier U2B keeps the high level unchanged. When the output voltage of the first operational amplifier U2A or the second operational amplifier U2B is turned from high level to low level, an input diode of the optical coupler U3 is conducted;
after the input diode of the optocoupler U3 is conducted, the output triode is turned on, and the system power supply 12V is applied to the main loop disconnection control circuit through the triode and the diode D2 of the optocoupler U3 to form a control signal for exciting the main loop disconnection control circuit to conduct. The control signal drives the MOS tube Q2 to be conducted after passing through the resistor R10 and the breakdown diode D4, after the MOS tube Q2 is conducted, a loop is formed from the system power supply 12V to the power ground through the resistor R8, the resistor R9 and the MOS tube Q2, the voltage of the emitter electrode of the PNP triode Q1 is larger than the voltage of the base electrode due to the voltage division of the resistor R8 and the resistor R9, the PNP triode Q1 is conducted, the system power supply 12V is applied to the coil end of the normally closed relay K1, the normally closed relay K1 is converted from normally closed to normally open, the loop is controlled by the main loop relay, and the main loop relay is disconnected. After the PNP triode Q1 is opened, the triode Q3 is driven to be opened by the system power supply 12V through the triode Q1, the resistor R14 and the resistor R15, after the triode Q3 is opened, a loop is formed by the system power supply 12V through the resistor R8, the resistor R13 and the triode Q3, and due to the voltage division effect of the resistor R8 and the resistor R13, the emitter voltage of the PNP triode Q1 is smaller than the base voltage, at this time, no matter whether the MOS tube Q2 is opened or not, the PNP triode Q1 is opened, the triode Q3 is opened by opening the PNP triode Q1, and thus the loop where the PNP triode Q1 and the triode Q3 are located forms an interlocking mechanism. The main loop relay keeps on the open state, only the system battery voltage is recovered to be normal, and the main loop relay is recovered to be closed again after the system is powered on again.
In addition, when the storage battery overvoltage and undervoltage circuit is used in the high-voltage battery system, each string of storage batteries is provided with the storage battery overvoltage and undervoltage circuit, and when any string of voltage is abnormal, the storage battery overvoltage and protection circuit is driven, and as the reverse withstand voltage of the output triode of the optocoupler U3 or the optocoupler U5 is limited, the diode D1 or the diode D2 connected in series with the emitter of the output triode plays a role in protecting the output triode of the optocoupler from being broken down by the reverse voltage.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (6)
1. A storage battery voltage detection and main loop disconnection control circuit is characterized in that: the device comprises a voltage detection circuit for detecting overvoltage and undervoltage of the storage battery and a main loop disconnection control circuit for controlling relay on a main loop of charging and discharging of the storage battery to be disconnected, wherein the voltage detection circuits are isolated and correlated with the main loop disconnection control circuit through an optocoupler and form a control signal for exciting the connection of the main loop disconnection control circuit; the main loop disconnection control circuit comprises a MOS tube Q2 and a PNP triode Q1, wherein a control signal is connected with the grid electrode of the MOS tube Q2 after passing through a resistor R10 and a breakdown diode D4, the drain electrode of the MOS tube Q2 is connected with a system power supply 12V after passing through a resistor R9 and a resistor R8 in sequence, and the source electrode of the MOS tube Q2 is grounded; the emitter of the PNP triode Q1 is connected with a system power supply 12V, the collector of the PNP triode Q1 is connected with the coil input end of the normally-closed relay K1, the base of the PNP triode Q1 is connected with the common end of a resistor R8 and a resistor R9, a capacitor C12 is connected with the resistor R8 in parallel, and the collector of the PNP triode Q1 is grounded through the resistor R14 and the resistor R16 in sequence; the normally closed relay K1 is a main loop relay for controlling the charge and discharge of the storage battery.
2. The battery voltage detection and main loop disconnection control circuit according to claim 1, wherein: the voltage detection circuit comprises a voltage reference source, a first operational amplifier and a second operational amplifier, wherein the positive electrode and the negative electrode of the storage battery are respectively in one-to-one correspondence with the positive electrode and the negative electrode of the voltage reference source and are connected, the voltage reference source is respectively connected with the inverting terminal of the first operational amplifier and the inverting terminal of the second operational amplifier, the voltage of the storage battery is divided by a resistor R2 and a resistor R4 and then is input to the inverting terminal of the second operational amplifier for overvoltage detection of the storage battery, and a voltage stabilizing filter capacitor C7 and the resistor R4 are connected in parallel; the voltage of the storage battery is divided by a resistor R5 and a resistor R7 and then is input to the same-phase end of the first operational amplifier for undervoltage detection of the storage battery, and a voltage stabilizing filter capacitor C11 is connected with the resistor R7 in parallel; the output end of the first operational amplifier is connected with the cathode of the input diode of the optical coupler U3 after passing through a diode D7 and a resistor R3, and the output end of the second operational amplifier is connected with the cathode of the input diode of the optical coupler U3 after passing through a diode D8 and a resistor R6; the collector of the triode at the output end of the optical coupler U3 is connected with the system power supply 12V, and the emitter of the triode at the output end of the optical coupler U3 is output to the main loop disconnection control circuit after passing through the diode D2.
3. The battery voltage detection and main loop disconnection control circuit according to claim 1, wherein: a voltage stabilizing diode D6 for stabilizing the voltage of the MOS tube Q2 is arranged in the main loop disconnection control circuit, the negative electrode end of the voltage stabilizing diode D6 is connected with the grid electrode of the MOS tube Q2, and the positive electrode of the voltage stabilizing diode D6 is grounded.
4. The battery voltage detection and main loop disconnection control circuit according to claim 1, wherein: a diode D3 is connected in parallel to the resistor R10.
5. The battery voltage detection and main loop disconnection control circuit according to claim 1, wherein: a triode Q3 is arranged in the main loop disconnection control circuit; the common end of the resistor R14 and the resistor R16 is connected with the base electrode of the triode Q3 through the resistor R15, the capacitor C1 is connected with the resistor R16 in parallel, and the collector electrode of the triode Q3 is connected with the common end of the resistor R8 and the resistor R9 through the resistor R13.
6. The battery voltage detection and main loop disconnection control circuit according to claim 1, wherein: a diode D5 for switching and freewheeling the normally closed relay is arranged in the main loop disconnection control circuit, the negative electrode end of the diode D5 is connected with the collector electrode of the PNP triode Q1, and the positive electrode of the diode D5 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322989381.8U CN220291666U (en) | 2023-11-07 | 2023-11-07 | Storage battery voltage detection and main loop disconnection control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322989381.8U CN220291666U (en) | 2023-11-07 | 2023-11-07 | Storage battery voltage detection and main loop disconnection control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220291666U true CN220291666U (en) | 2024-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322989381.8U Active CN220291666U (en) | 2023-11-07 | 2023-11-07 | Storage battery voltage detection and main loop disconnection control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220291666U (en) |
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2023
- 2023-11-07 CN CN202322989381.8U patent/CN220291666U/en active Active
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