CN205229425U - A cross under -voltage failure detector circuit for on -vehicle low pressure battery of electric automobile - Google Patents
A cross under -voltage failure detector circuit for on -vehicle low pressure battery of electric automobile Download PDFInfo
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Abstract
The utility model relates to a cross under -voltage failure detector circuit for on -vehicle low pressure battery of electric automobile, include: the under -voltage sampling circuit and the excessive pressure sampling circuit that link to each other with the battery, under -voltage sampling circuit links to each other with NAND gate circuit through under -voltage judgement circuit, excessive pressure sampling circuit judges through the excessive pressure that the circuit also links to each other with NAND gate circuit, and it still includes to cross under -voltage failure detector circuit: control module, just NAND gate circuit sends under -voltage or excessive pressure fault -signal to control module, the utility model discloses a this is crossed under -voltage failure detector circuit and carries out real -time supervision to low pressure battery voltage, and when taking place under -voltage trouble, fault -signal handles transfer in time for control module. This is crossed under -voltage failure detector circuit and need not to rely on extra reference voltage, and reliability and stability are stronger.
Description
Technical field
The utility model relates to new-energy automobile field, particularly relates to a kind of overvoltage/undervoltage failure detector circuit for the vehicle-mounted low tension battery of electric automobile.
Background technology
Working power in electric automobile needed for each control circuit is converted through DC/DC by vehicle-mounted 12V/24V low tension battery usually, when accumulator occurs that overvoltage/undervoltage is abnormal, control circuit operation irregularity will be caused, time serious, even cause components and parts to damage, threaten traffic safety.
Prior art adopts comparer to carry out overvoltage/undervoltage detection usually.As sampled voltage and reference voltage compare by application number CN201210559139.0 patent utilization comparer, carry out overvoltage/undervoltage judgement, when there is overvoltage/undervoltage fault, output low level signal processes to dsp controller.
Application number is that the Chinese invention patent of CN201210559139.0 discloses 12V voltage monitoring circuit in a kind of electric automobile electric drive controller.This patent comprises voltage reference and arranges circuit for setting overvoltage threshold and the brownout threshold of 12V voltage; 12V battery tension is carried out dividing potential drop and obtains voltage detection signal by voltage comparator circuit, compares, the output low level fault-signal when voltage detection signal exceeds overvoltage threshold or brownout threshold with voltage detection signal and overvoltage threshold and brownout threshold; The low level fault signal that voltage comparator circuit exports by optical coupling isolation circuit carries out level isolation conversion, obtains the level signal with DSP main control chip compatibility, and transfers to DSP main control chip.
This testing circuit has following defect:
This circuit has used 5V power supply to provide reference voltage, and is that comparer and isolation optocoupler are powered.And this 5V power supply is converted through DC/DC by 12V accumulator usually in practical application, when battery tension is abnormal, this 5V voltage will be affected, and then affect the validity and reliability of supervisory circuit.
Utility model content
The purpose of this utility model is to provide a kind of overvoltage/undervoltage failure detector circuit for the vehicle-mounted low tension battery of electric automobile, carries out overvoltage/undervoltage fault detection problem to solve to vehicle-mounted low tension battery.
In order to solve the problems of the technologies described above, the utility model provides a kind of overvoltage/undervoltage failure detector circuit for the vehicle-mounted low tension battery of electric automobile, comprise: the under-voltage sample circuit be connected with accumulator and overvoltage sample circuit, described under-voltage sample circuit is connected with NAND gate circuit by under-voltage decision circuitry; Described overvoltage sample circuit is also connected with NAND gate circuit by overvoltage decision circuitry; And described overvoltage/undervoltage failure detector circuit also comprises: control module, namely under-voltage or overvoltage fault-signal are sent to control module by described NAND gate circuit.
Further, described under-voltage sample circuit comprises: resistance R11, resistance R12, filter capacitor C11, wherein said resistance R11 forms with resistance R12 reduction voltage circuit of connecting, namely the positive voltage input end of described accumulator is connected with one end of resistance R11, and described resistance R11 and resistance R12 junction M1 is as the output terminal of under-voltage sample circuit.
Further, described under-voltage decision circuitry comprises: voltage stabilizing diode Z1, resistance R13, optocoupler U1, resistance R14, resistance R15, triode Q1, the negative electrode of wherein said voltage stabilizing diode Z1 is connected with the output terminal of under-voltage sample circuit, the anode of this voltage stabilizing diode Z1 connects optocoupler U1 by resistance R13, to drive the illuminator in optocoupler U1, light-receiving device collector in described optocoupler U1 is connected with triode Q1 base stage, described resistance R14 and the connect bias pressure resistance of resistance R15 as triode Q1 base stage, and by power supply VCC ground connection; The collector of described triode Q1 base stage is as the output terminal of under-voltage decision circuitry.
Further, described overvoltage sample circuit comprises: resistance R21, resistance R22, filter capacitor C21, wherein said resistance R21 forms with resistance R22 reduction voltage circuit of connecting, namely the positive voltage input end of described accumulator is connected with one end of resistance R21, and described resistance R21 and resistance R22 junction M2 is as the output terminal of overvoltage sample circuit.
Further, described overvoltage decision circuitry comprises: voltage stabilizing diode Z2, resistance R23, optocoupler U2, the negative electrode of wherein said voltage stabilizing diode Z2 is connected with the output terminal of overvoltage sample circuit, the anode of this voltage stabilizing diode Z2 connects optocoupler U2 by resistance R23, to drive the illuminator in optocoupler U2, the light-receiving device collector in described optocoupler U2 is as the output terminal of overvoltage decision circuitry.
Further, described NAND gate circuit comprises: triode Q2, and the under-voltage detection signal, the overvoltage detection signal that gather is carried out the conducting that merges to control triode Q2 or shutoff.
Further, described NAND gate circuit comprises: diode D1, diode D2, resistance R3, resistance R4, resistance R5, the negative electrode of wherein said diode D1 connects the output terminal of under-voltage decision circuitry, to gather under-voltage detection signal, the negative electrode of described diode D2 connects the output terminal of overvoltage decision circuitry, to gather overvoltage detection signal; The anode of described diode D1, diode D2 is connected to form tie point M3, and this tie point M3 is connected with the base stage of triode Q2 by resistance R4, and power supply VCC connects described tie point M3 by resistance R3; The collector of described triode Q2 is connected with power supply VCC, and its emitter contact resistance R5 over the ground, and using the output terminal of this emitter as NAND gate circuit.
Further, the input end of described under-voltage sample circuit, overvoltage sample circuit is respectively equipped with filtering circuit.
The beneficial effects of the utility model are, of the present utility model overvoltage/undervoltage failure detector circuit carries out Real-Time Monitoring to low tension battery voltage, when there is overvoltage/undervoltage fault, fault-signal processes passing to control module in real time, overvoltage/undervoltage failure detector circuit is without the need to relying on extra reference voltage, have the advantage that circuit structure is simple, dependable performance, stability are high, with low cost, the low tension battery overvoltage/undervoltage that can be widely used in electric automobile detects.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the theory diagram of overvoltage/undervoltage failure detector circuit of the present utility model;
Fig. 2 is the circuit theory diagrams of overvoltage/undervoltage failure detector circuit of the present utility model.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
As shown in Figure 1, the utility model provides a kind of overvoltage/undervoltage failure detector circuit for the vehicle-mounted low tension battery of electric automobile, comprise: the under-voltage sample circuit be connected with accumulator and overvoltage sample circuit, described under-voltage sample circuit is connected with NAND gate circuit by under-voltage decision circuitry; Described overvoltage sample circuit is also connected with NAND gate circuit by overvoltage decision circuitry; And described overvoltage/undervoltage failure detector circuit also comprises: control module, namely under-voltage or overvoltage fault-signal are sent to control module by described NAND gate circuit.
Wherein, accumulator is 12V/24V low tension battery, and control module, such as but not limited to processing modules such as employing DSP, single-chip microcomputer, ARM, receives under-voltage or overvoltage fault-signal, row relax of going forward side by side.
Concrete, as shown in Figure 2, described under-voltage sample circuit comprises: resistance R11, resistance R12, filter capacitor C11, wherein said resistance R11 forms with resistance R12 reduction voltage circuit of connecting, namely the positive voltage input end of described accumulator is connected with one end of resistance R11, described resistance R11 and resistance R12 junction M1, as the output terminal of under-voltage sample circuit, namely exports under-voltage sampled voltage.
Preferably, described under-voltage decision circuitry comprises: voltage stabilizing diode Z1, resistance R13, optocoupler U1, resistance R14, resistance R15, triode Q1, the negative electrode of wherein said voltage stabilizing diode Z1 is connected with the output terminal of under-voltage sample circuit, the anode of this voltage stabilizing diode Z1 connects optocoupler U1 by resistance R13, to drive the illuminator in optocoupler U1, light-receiving device collector in described optocoupler U1 is connected with triode Q1 base stage, described resistance R14 and the connect bias pressure resistance of resistance R15 as triode Q1 base stage, and by power supply VCC ground connection; The collector of described triode Q1 base stage is as the output terminal of under-voltage decision circuitry.Concrete, the break-make that the under-voltage sampled voltage obtained through under-voltage sample circuit controls voltage stabilizing diode Z1 controls the break-make of optocoupler U1,3 pin of optocoupler U1 export under-voltage detection signal, and described under-voltage detection signal controls triode Q1 break-make, exports anti-phase under-voltage detection signal.
Preferably, described overvoltage sample circuit comprises: resistance R21, resistance R22, filter capacitor C21, wherein said resistance R21 forms with resistance R22 reduction voltage circuit of connecting, namely the positive voltage input end of described accumulator is connected with one end of resistance R21, described resistance R21 and resistance R22 junction M2 as the output terminal of overvoltage sample circuit, i.e. output overvoltage sampled voltage.
Preferably, described overvoltage decision circuitry comprises: voltage stabilizing diode Z2, resistance R23, optocoupler U2, the negative electrode of wherein said voltage stabilizing diode Z2 is connected with the output terminal of overvoltage sample circuit, the anode of this voltage stabilizing diode Z2 connects optocoupler U2 by resistance R23, to drive the illuminator in optocoupler U2, the light-receiving device collector in described optocoupler U2 is as the output terminal of overvoltage decision circuitry; Concrete, the overvoltage sampled voltage obtained through overvoltage sample circuit controls the break-make of voltage stabilizing diode Z2 and then controls the break-make of optocoupler U2, makes the 3 pin output overvoltage detection signals of optocoupler U2.
Described NAND gate circuit comprises: triode Q2, and the under-voltage detection signal, the overvoltage detection signal that gather are carried out the conducting that merges to control triode Q2 or shutoff, realize overvoltage/undervoltage fault-signal BAT_ERROR to change, this overvoltage/undervoltage fault-signal BAT_ERROR accesses to control module respective pin.
Concrete, described NAND gate circuit comprises: diode D1, diode D2, resistance R3, resistance R4, resistance R5, the negative electrode of wherein said diode D1 connects the output terminal of under-voltage decision circuitry, to gather under-voltage detection signal, the negative electrode of described diode D2 connects the output terminal of overvoltage decision circuitry, to gather overvoltage detection signal; The anode of described diode D1, diode D2 is connected to form tie point M3, and this tie point M3 is connected with the base stage of triode Q2 by resistance R4, and power supply VCC connects described tie point M3 by resistance R3; The collector of described triode Q2 is connected with power supply VCC, and its emitter contact resistance R5 over the ground, and using the output terminal of this emitter as NAND gate circuit.
The input end of described under-voltage sample circuit, overvoltage sample circuit is respectively equipped with filtering circuit.
The principle of work of overvoltage/undervoltage failure detector circuit of the present utility model is as follows:
Under-voltage sample circuit, overvoltage sample circuit carry out electric resistance partial pressure sampling to the voltage BAT_VIN of accumulator respectively, the resistance of divider resistance R11 and R12 matches with the voltage stabilizing value of voltage stabilizing diode Z1 can arrange the under-voltage detection threshold at M1 place, junction, and the resistance of divider resistance R21 and resistance R22 matches with the voltage stabilizing value of voltage stabilizing diode Z2 can arrange the overvoltage detection threshold at M2 place, junction.Time normal, under-voltage detection voltage stabilizing diode Z1 is in reverse breakdown state, and optocoupler U1 is triggered conducting, the base stage of triode Q1 is pulled to ground by resistance R15, triode Q1 is in off state, under-voltage decision circuitry no-output, does not impact the current potential at tie point M3 place.Time normal, overvoltage detects voltage stabilizing diode Z2 and is in off state, optocoupler U2 not conducting, and optocoupler U2 exports and is in off state, overvoltage decision circuitry no-output, does not impact the current potential at tie point M3 place.Therefore time normal, the current potential at tie point M3 place is pulled to high level by resistance R3, and the base stage of triode Q2 is high level, and triode Q2 is in off state, overvoltage/undervoltage fault-signal output terminal is pulled to ground, therefore what be delivered to control module time normal is low level signal.Time under-voltage, state when voltage stabilizing diode Z2 maintains normal, voltage stabilizing diode Z1 becomes off state from reverse breakdown state time normal, optocoupler U1 not conducting, triode Q1 base stage is pulled to high level by resistance R14, triode Q1 conducting, triode Q1 grounded collector, the i.e. under-voltage fault-signal of under-voltage decision circuitry output low level, the current potential at tie point M3 place becomes low level from high level time normal, triode Q2 base stage is pulled to ground, and triode Q2 conducting, the overvoltage/undervoltage fault-signal being delivered to control module is high level by low transition time normal.During overvoltage, state time voltage stabilizing diode Z1 maintains normal, overvoltage detects stabilivolt Z2 and becomes reverse breakdown state from off state time normal, optocoupler U2 conducting, 3 pin of optocoupler U2 are pulled to ground, the overvoltage fault-signal of i.e. overvoltage decision circuitry output low level, the current potential at tie point M3 place becomes low level from high level time normal, the base stage of triode Q2 is pulled to ground, triode Q2 conducting, the overvoltage or the under-voltage fault-signal that are delivered to control module are high level by low transition time normal.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on instructions, must determine its technical scope according to right.
Claims (8)
1., for an overvoltage/undervoltage failure detector circuit for the vehicle-mounted low tension battery of electric automobile, it is characterized in that, comprising:
The under-voltage sample circuit be connected with accumulator and overvoltage sample circuit,
Described under-voltage sample circuit is connected with NAND gate circuit by under-voltage decision circuitry, and described overvoltage sample circuit is also connected with NAND gate circuit by overvoltage decision circuitry; And
Described overvoltage/undervoltage failure detector circuit also comprises: control module, and namely under-voltage or overvoltage fault-signal are sent to control module by described NAND gate circuit.
2. overvoltage/undervoltage failure detector circuit according to claim 1, is characterized in that,
Described under-voltage sample circuit comprises: resistance R11, resistance R12, filter capacitor C11, wherein
Described resistance R11 forms with resistance R12 reduction voltage circuit of connecting, namely
The positive voltage input end of described accumulator is connected with one end of resistance R11, and described resistance R11 and resistance R12 junction M1 is as the output terminal of under-voltage sample circuit.
3. overvoltage/undervoltage failure detector circuit according to claim 2, is characterized in that, described under-voltage decision circuitry comprises: voltage stabilizing diode Z1, resistance R13, optocoupler U1, resistance R14, resistance R15, triode Q1, wherein
The negative electrode of described voltage stabilizing diode Z1 is connected with the output terminal of under-voltage sample circuit, the anode of this voltage stabilizing diode Z1 connects optocoupler U1 by resistance R13, to drive the illuminator in optocoupler U1, light-receiving device collector in described optocoupler U1 is connected with triode Q1 base stage, described resistance R14 and the connect bias pressure resistance of resistance R15 as triode Q1 base stage, and by power supply VCC ground connection;
The collector of described triode Q1 base stage is as the output terminal of under-voltage decision circuitry.
4. overvoltage/undervoltage failure detector circuit according to claim 3, is characterized in that, described overvoltage sample circuit comprises: resistance R21, resistance R22, filter capacitor C21, wherein
Described resistance R21 forms with resistance R22 reduction voltage circuit of connecting, namely
The positive voltage input end of described accumulator is connected with one end of resistance R21, and described resistance R21 and resistance R22 junction M2 is as the output terminal of overvoltage sample circuit.
5. overvoltage/undervoltage failure detector circuit according to claim 4, is characterized in that, described overvoltage decision circuitry comprises: voltage stabilizing diode Z2, resistance R23, optocoupler U2, wherein
The negative electrode of described voltage stabilizing diode Z2 is connected with the output terminal of overvoltage sample circuit, the anode of this voltage stabilizing diode Z2 connects optocoupler U2 by resistance R23, to drive the illuminator in optocoupler U2, the light-receiving device collector in described optocoupler U2 is as the output terminal of overvoltage decision circuitry.
6. overvoltage/undervoltage failure detector circuit according to claim 5, is characterized in that, described NAND gate circuit comprises: triode Q2, and the under-voltage detection signal, the overvoltage detection signal that gather is carried out the conducting that merges to control triode Q2 or shutoff.
7. overvoltage/undervoltage failure detector circuit according to claim 6, is characterized in that, described NAND gate circuit comprises: diode D1, diode D2, resistance R3, resistance R4, resistance R5, wherein
The negative electrode of described diode D1 connects the output terminal of under-voltage decision circuitry, to gather under-voltage detection signal,
The negative electrode of described diode D2 connects the output terminal of overvoltage decision circuitry, to gather overvoltage detection signal;
The anode of described diode D1, diode D2 is connected to form tie point M3, and this tie point M3 is connected with the base stage of triode Q2 by resistance R4, and power supply VCC connects described tie point M3 by resistance R3;
The collector of described triode Q2 is connected with power supply VCC, and its emitter contact resistance R5 over the ground, and using the output terminal of this emitter as NAND gate circuit.
8. overvoltage/undervoltage failure detector circuit according to claim 7, is characterized in that, the input end of described under-voltage sample circuit, overvoltage sample circuit is respectively equipped with filtering circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521027790.9U CN205229425U (en) | 2015-12-10 | 2015-12-10 | A cross under -voltage failure detector circuit for on -vehicle low pressure battery of electric automobile |
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| CN201521027790.9U CN205229425U (en) | 2015-12-10 | 2015-12-10 | A cross under -voltage failure detector circuit for on -vehicle low pressure battery of electric automobile |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112285575A (en) * | 2020-10-15 | 2021-01-29 | 中车大连电力牵引研发中心有限公司 | Direct-current voltage under-voltage detection circuit of storage battery |
| CN112540218A (en) * | 2020-12-07 | 2021-03-23 | 上海卫星工程研究所 | Satellite final assembly integrated test factory building dress star lithium cell group under-voltage alarm device |
| CN113406528A (en) * | 2021-06-23 | 2021-09-17 | 新风光电子科技股份有限公司 | Overvoltage and undervoltage detection circuit for input voltage of switching power supply |
| CN114859259A (en) * | 2022-04-25 | 2022-08-05 | 中国电子科技集团公司第十四研究所 | High-voltage input detection circuit |
| CN115356652A (en) * | 2022-08-16 | 2022-11-18 | 西安军陶科技有限公司 | Power failure detection and output control system |
| CN115754437A (en) * | 2022-09-29 | 2023-03-07 | 深圳市鑫宇鹏电子科技有限公司 | An abnormal detection and alarm circuit, method, device and equipment for mains voltage |
-
2015
- 2015-12-10 CN CN201521027790.9U patent/CN205229425U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285575A (en) * | 2020-10-15 | 2021-01-29 | 中车大连电力牵引研发中心有限公司 | Direct-current voltage under-voltage detection circuit of storage battery |
| CN112540218A (en) * | 2020-12-07 | 2021-03-23 | 上海卫星工程研究所 | Satellite final assembly integrated test factory building dress star lithium cell group under-voltage alarm device |
| CN113406528A (en) * | 2021-06-23 | 2021-09-17 | 新风光电子科技股份有限公司 | Overvoltage and undervoltage detection circuit for input voltage of switching power supply |
| CN114859259A (en) * | 2022-04-25 | 2022-08-05 | 中国电子科技集团公司第十四研究所 | High-voltage input detection circuit |
| CN115356652A (en) * | 2022-08-16 | 2022-11-18 | 西安军陶科技有限公司 | Power failure detection and output control system |
| CN115356652B (en) * | 2022-08-16 | 2024-05-03 | 西安军陶科技有限公司 | Power failure detection and output control system |
| CN115754437A (en) * | 2022-09-29 | 2023-03-07 | 深圳市鑫宇鹏电子科技有限公司 | An abnormal detection and alarm circuit, method, device and equipment for mains voltage |
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