CN104953555A - Over-voltage and over-current protection system and over-voltage and over-current protection method for battery - Google Patents
Over-voltage and over-current protection system and over-voltage and over-current protection method for battery Download PDFInfo
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- CN104953555A CN104953555A CN201510345231.0A CN201510345231A CN104953555A CN 104953555 A CN104953555 A CN 104953555A CN 201510345231 A CN201510345231 A CN 201510345231A CN 104953555 A CN104953555 A CN 104953555A
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Abstract
The invention discloses an over-voltage and over-current protection system and an over-voltage and over-current protection method for a battery. The over-voltage and over-current protection system comprises a signal preprocessing module, a comparison module, a logic module and a control module, wherein the signal preprocessing module is used for preprocessing a voltage/current signal of the battery; the comparison module is connected with a voltage/current output of the signal preprocessing module and is compared with a preset value; the logic module is connected with a voltage/current output of the comparison module; the control module is connected with the voltage/current output of the signal preprocessing module and is connected with the input of the logical module. According to the over-voltage and over-current protection system and the over-voltage and over-current protection method disclosed by the invention, part of logical judgment function can be separated from a software system, the problem of the delay and the reliability of over-voltage and over-current protection can be solved, and the effects of quick judgment and quick response are achieved; compared with the prior art, the over-voltage and over-current protection system and the over-voltage and over-current protection method have remarkable advantages, and have huge application value and commercial prospect on the future power lithium ion battery market of electromobiles.
Description
Technical field
The present invention relates to a kind of battery over-voltage over-current protection system and method.
Background technology
For the battery protection schemes of electric automobile (hybrid vehicle) in current new-energy automobile industry, its main flow implementation is rely on the control strategy of software, namely when current sensor detects that abnormal conditions are reported to battery management system by current anomaly or voltage sample after abnormal, then made a response by battery management system software, send the corresponding command and disconnect power line relay or do secondary diagnosis; This scheme is very high for the reliability requirement of Vehicular system software, and when system program response delay or system cloud gray model enter endless loop, the failure rate of this scheme is higher.This scheme is owing to being waiting system reaction again after wait fault-signal in addition, then judge and corresponding measure, its result is inherently with the defect of time delay.In the significant trouble situation that over-voltage and over-current appears in battery, be unfavorable for the protection of vehicle body safety and the timely prevention to failure accident.
Summary of the invention
The present invention seeks to: provide a kind of battery over-voltage over-current protection system and method, to solve two problems: for from detecting that over-voltage and over-current fault makes the time delay problem of respective reaction to system; And functional realiey is when relying on for system program height, when crashing or resetting appears in system program, for the integrity problem of over-voltage over-current protection.
First technical scheme of the present invention is: a kind of battery over-voltage over-current protection system, and it comprises and carries out pretreated signal pre-processing module to electrokinetic cell voltage/current signals, exports be connected and the comparison module compared with preset value, export the logic module that is connected and export with signal pre-processing module voltage/current be connected and the control module be connected with logic module input with comparison module voltage/current with signal pre-processing module voltage/current.
On the basis of technique scheme, comprise following attached technical scheme further:
Described signal pre-processing module comprises electrokinetic cell, input negative terminal is connected with power battery anode inputs voltage operational amplifier that anode is then connected with power battery cathode, be connected with power battery cathode and the Hall element be connected with power line loop and input anode and be connected with Hall element and input the current operational amplifier that negative terminal and output is connected, and wherein the output of voltage operational amplifier, current operational amplifier is all connected with control module.
Described comparison module comprises input negative terminal and voltage operational amplifier and exports and be connected and input voltage comparator that anode is connected with Vcc power supply and input negative terminal and current operational amplifier and export and be connected and input the current comparator that anode is connected to the ground.
Described logic module carries out the computing of logical "and", and its input is connected with the output of voltage comparator, current comparator, control module respectively, exports the action then controlling power line loop repeat circuit.
Described control module is single-chip microcomputer.
Second technical scheme of the present invention is: a kind of battery over-voltage over-current protection method, and it comprises:
S1: scale operation is carried out to the voltage signal of electrokinetic cell and the current signal in power line loop, and output is fed back to voltage, current comparator and control module respectively;
S2: the input of voltage, current comparator is compared with preset value respectively, and produce corresponding output;
S3: the computing output of the output of voltage, current comparator, control module being carried out logical AND;
S4: the action controlling power line loop repeat circuit according to the operation result of logical AND.
On the basis of technique scheme, comprise following attached technical scheme further:
Its hardware configuration comprises and carries out pretreated signal pre-processing module to electrokinetic cell voltage/current signals, exports be connected and the comparison module compared with preset value, export the logic module that is connected and export with signal pre-processing module voltage/current be connected and the control module be connected with logic module input with comparison module voltage/current with signal pre-processing module voltage/current.
Signal pre-processing module comprises electrokinetic cell, input negative terminal is connected with power battery anode inputs voltage operational amplifier that anode is then connected with power battery cathode, be connected with power battery cathode and the Hall element be connected with power line loop and input anode and be connected with Hall element and input the current operational amplifier that negative terminal and output is connected, and wherein the output of voltage operational amplifier, current operational amplifier is all connected with control module.
Described comparison module comprises input negative terminal and voltage operational amplifier and exports and be connected and input voltage comparator that anode is connected with Vcc power supply and input negative terminal and current operational amplifier and export and be connected and input the current comparator that anode is connected to the ground.
Described logic module carries out the computing of logical "and", and its input is connected with the output of voltage comparator, current comparator, control module respectively, exports the action then controlling power line loop repeat circuit.
Advantage of the present invention is:
The present invention is made up of basic electric elements, and the differential amplifier circuit of operational amplifier of applying in a flexible way, voltage comparator and follower, convert high pressure or current signal to low voltage signal, compared by this signal with the alarming value preset; And in conjunction with logic gates, relatively rear signal and MCU software command are done logical operation, using the final executor that the result after computing drives as trigger relay, partial logic arbitration functions can be separated from software systems thus, reach quick judgement, rapid-action effect, compared with prior art has clear superiority, and following electric powered motor lithium ion battery market can have huge using value and commercial promise.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Embodiment: as shown in Figure 1; for the invention provides a kind of first embodiment of battery over-voltage over-current protection system, it comprise to electrokinetic cell voltage/current signals carry out pretreated signal pre-processing module, with signal pre-processing module voltage/current export be connected and the comparison module compared with preset value, with comparison module voltage/current export be connected logic module, to export with signal pre-processing module voltage/current and be connected and the control module be connected with logic module input.Control module is single-chip microprocessor MCU, can adopt the S12XE series monolithic of Freescale company.
Signal pre-processing module comprises electrokinetic cell, input negative terminal is connected with power battery anode inputs voltage operational amplifier U1A that anode is then connected with power battery cathode, be connected with power battery cathode and the Hall element be connected with power line loop and input anode and be connected with Hall element and input the current operational amplifier U1B that negative terminal and output is connected.Wherein the output of voltage operational amplifier U1A, current operational amplifier U1B is all connected with control module.High pressure aspect, by the difference amplifier of voltage operational amplifier U1A, high pressure is carried out scale operation, be converted to low-voltage signal, deliver to voltage comparator U2A does voltage compare process to low-voltage signal after conversion on the one hand, deliver to MCU analog sampling end on the one hand, make MCU carry out Real-Time Monitoring to battery total voltage; Electric current aspect, gather power line electric current by application Hall element and be converted to voltage signal, again by being followed by amplifier after voltage division processing, magnitude of voltage after following is delivered to current comparator U2B respectively and compares process, and deliver to MCU analog sampling end, make system program carry out Real-Time Monitoring to power line electric current.Scale operation for voltage and electric current can be arranged according to the resistance parameter in circuit, selects respective resistance values in actual applications according to real needs.The input anode of voltage operational amplifier U1A is connected to the ground by resistance R4, and is connected with the negative pole of electrokinetic cell by resistance R2; And the input negative terminal of voltage operational amplifier U1A is connected with the positive pole of electrokinetic cell by resistance R1 and is connected with output by resistance R3, the input anode of current operational amplifier U1B is connected to the ground by resistance R7, and is connected with Hall element by resistance R6.
Comparison module comprises input negative terminal and voltage operational amplifier U1A and exports and be connected and input voltage comparator U2A that anode is connected with Vcc power supply and input negative terminal and current operational amplifier U1B and export and be connected and input the current comparator U2B that anode is connected to the ground, wherein be provided with resistance R9, R10, R11 between Vcc VDD-to-VSS, and resistance R10 is between the two input anodes of voltage comparator U2A and current comparator U2B.Preset the preset value of voltage and electric current in the control module, by voltage comparator principle, the voltage after scale operation and current value and the preset value that sets in advance are compared, when measured value is lower than preset value, comparator exports high level; When measured value occurs higher than regarding as overvoltage/overcurrent condition during preset value, comparator output low level.Concrete preset value can be set by the resistance of resistance R9-11, can arrange relevant parameter according to different application.
Logic module carries out the computing of logical "and", and its input is connected with the output of voltage comparator U2A, current comparator U2B, control module respectively, exports the action then controlling power line loop repeat circuit.AND operation is carried out in the Control instruction that the output valve of comparator and MCU send by logic module thus, the final order that the result after computing drives as relay.Under normal circumstances, when namely there is not overcurrent-overvoltage fault, comparator exports high level, and the result of logical operation is determined by MCU, and namely the disconnection of relay and adhesive are determined by MCU order; And when overvoltage/overcurrent condition occurs, comparator output low level, logical gate operations result is " 0 ", namely under any command situation of MCU, all forces relay to disconnect, and accomplishes power line open circuit process, protection dynamical system.So far the protection to over-voltage and over-current situation is completed.
In the present embodiment, the grounding requirement in circuit and car load ground isolate.
On the basis of foregoing circuit structure, provide the second embodiment of battery over-voltage over-current protection method of the present invention further, its step is as follows:
S1: scale operation is carried out to the voltage signal of electrokinetic cell and the current signal in power line loop, and by output feedack to comparator and control module, wherein comparator comprises voltage comparator and current comparator;
S2: the input of voltage, current comparator is compared with preset value respectively, and produce corresponding output;
S3: the computing output of the output of voltage, current comparator, control module being carried out logical AND;
S4: the action controlling power line loop repeat circuit according to the operation result of logical AND.
The present invention, owing to realizing by hardware circuit from over-voltage and over-current failure diagnosis to all processes of making a response to fault, efficiently solves the time delay problem proposed above; And be all made up of base electronic element and can be used as the part that a circuit module becomes system hardware, reduce the dependence to system program, therefore effectively can avoid this disabler problem because program mal causes, improve reliability and alleviate the burden of system program; The time delay that effective solution proposes above and integrity problem.
Certain above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to the Spirit Essence of main technical schemes of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (10)
1. a battery over-voltage over-current protection system, is characterized in that it comprises: carry out pretreated signal pre-processing module to electrokinetic cell voltage/current signals, export be connected and the comparison module compared with preset value, export the logic module that is connected and export with signal pre-processing module voltage/current be connected and the control module be connected with logic module input with comparison module voltage/current with signal pre-processing module voltage/current.
2. a kind of battery over-voltage over-current protection system as claimed in claim 1; it is characterized in that: described signal pre-processing module comprises electrokinetic cell, input negative terminal is connected with power battery anode inputs voltage operational amplifier that anode is then connected with power battery cathode, be connected with power battery cathode and the Hall element be connected with power line loop and input anode and be connected with Hall element and input the current operational amplifier that negative terminal and output is connected, wherein the output of voltage operational amplifier, current operational amplifier is all connected with control module.
3. a kind of battery over-voltage over-current protection system as claimed in claim 1, is characterized in that: described comparison module comprises input negative terminal and voltage operational amplifier and exports and be connected and input voltage comparator that anode is connected with Vcc power supply and input negative terminal and current operational amplifier and export and be connected and input the current comparator that anode is connected to the ground.
4. a kind of battery over-voltage over-current protection system as claimed in claim 1; it is characterized in that: described logic module carries out the computing of logical "and"; its input is connected with the output of voltage comparator, current comparator, control module respectively, exports the action then controlling power line loop repeat circuit.
5. a kind of battery over-voltage over-current protection system as claimed in claim 1, is characterized in that: described control module is single-chip microcomputer.
6. a battery over-voltage over-current protection method, is characterized in that it comprises:
S1: scale operation is carried out to the voltage signal of electrokinetic cell and the current signal in power line loop, and output is fed back to voltage, current comparator and control module respectively;
S2: the input of voltage, current comparator is compared with preset value respectively, and produce corresponding output;
S3: the computing output of the output of voltage, current comparator, control module being carried out logical AND;
S4: the action controlling power line loop repeat circuit according to the operation result of logical AND.
7. a kind of battery over-voltage over-current protection method as claimed in claim 6, is characterized in that: its hardware configuration comprises and carries out pretreated signal pre-processing module to electrokinetic cell voltage/current signals, exports be connected and the comparison module compared with preset value, export the logic module that is connected and export with signal pre-processing module voltage/current be connected and the control module be connected with logic module input with comparison module voltage/current with signal pre-processing module voltage/current.
8. a kind of battery over-voltage over-current protection method as claimed in claim 7; it is characterized in that: described signal pre-processing module comprises electrokinetic cell, input negative terminal is connected with power battery anode inputs voltage operational amplifier that anode is then connected with power battery cathode, be connected with power battery cathode and the Hall element be connected with power line loop and input anode and be connected with Hall element and input the current operational amplifier that negative terminal and output is connected, wherein the output of voltage operational amplifier, current operational amplifier is all connected with control module.
9. a kind of battery over-voltage over-current protection method as claimed in claim 8, is characterized in that: described comparison module comprises input negative terminal and voltage operational amplifier and exports and be connected and input voltage comparator that anode is connected with Vcc power supply and input negative terminal and current operational amplifier and export and be connected and input the current comparator that anode is connected to the ground.
10. a kind of battery over-voltage over-current protection method as claimed in claim 9; it is characterized in that: described logic module carries out the computing of logical "and"; its input is connected with the output of voltage comparator, current comparator, control module respectively, exports the action then controlling power line loop repeat circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510345231.0A CN104953555A (en) | 2015-06-19 | 2015-06-19 | Over-voltage and over-current protection system and over-voltage and over-current protection method for battery |
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| CN201510345231.0A CN104953555A (en) | 2015-06-19 | 2015-06-19 | Over-voltage and over-current protection system and over-voltage and over-current protection method for battery |
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| CN105576616A (en) * | 2015-12-22 | 2016-05-11 | 中国科学院等离子体物理研究所 | Full isolation measuring and protective device used for high voltage supply system |
| CN107918046A (en) * | 2017-10-23 | 2018-04-17 | 宁德时代新能源科技股份有限公司 | Current detection device and battery management system |
| CN110428597A (en) * | 2019-07-11 | 2019-11-08 | 大唐国际发电股份有限公司张家口发电厂 | The disconnected coal signalling alarm equipment of dynamic based on piezoelectric ceramics and its logical design |
| CN112003236A (en) * | 2020-08-28 | 2020-11-27 | 杭州海兴电力科技股份有限公司 | Overvoltage and overcurrent protection system for electric energy meter |
| WO2022156805A1 (en) * | 2021-01-25 | 2022-07-28 | 中国第一汽车股份有限公司 | High-voltage monitoring method and apparatus, storage medium and system |
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| CN105576616A (en) * | 2015-12-22 | 2016-05-11 | 中国科学院等离子体物理研究所 | Full isolation measuring and protective device used for high voltage supply system |
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