CN103022965A - Monitoring circuit of 12V voltage in electric vehicle electric drive controller - Google Patents
Monitoring circuit of 12V voltage in electric vehicle electric drive controller Download PDFInfo
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- CN103022965A CN103022965A CN2012105591390A CN201210559139A CN103022965A CN 103022965 A CN103022965 A CN 103022965A CN 2012105591390 A CN2012105591390 A CN 2012105591390A CN 201210559139 A CN201210559139 A CN 201210559139A CN 103022965 A CN103022965 A CN 103022965A
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Abstract
The invention discloses a monitoring circuit of 12V voltage in an electric vehicle electric drive controller. The monitoring circuit is characterized by comprising a voltage reference setting circuit which is used for setting an overvoltage threshold and an undervoltage threshold of the 12V voltage; a voltage comparison circuit which divides voltage of a 12V storage battery to obtain a voltage detection signal, then compares the voltage detection signal with the overvoltage threshold and the undervoltage threshold, and outputs a low electrical level fault signal when the voltage detection signal exceeds the overvoltage threshold or the undervoltage threshold; and an optical coupler isolation circuit which converts an electrical level of the low electrical level fault signal output by the voltage comparison circuit in isolation, then obtains an electrical level signal compatible with a digital signal processor (DSP) main control chip, and transmits the electrical level signal to the DSP main control chip. The monitoring circuit outputs the low electrical level fault signal when storage battery voltage is over or below given thresholds, and transmits the low electrical level fault signal to the DSP main control chip so as to obtain protection for a controller.
Description
Technical field
The present invention relates to a kind of supervisory circuit that is applied in the 12V input voltage in the electric automobile electricity driving governor.
Background technology
In electric vehicle controller, the required power supply of all chips all converts through DC/DC by car load 12V lead acid accumulator, if the 12V spread of voltage of lead-acid battery, will directly affect the normal operation of controller controling circuit, and then affect vehicle performance, cause traffic safety hidden danger.Therefore must carry out Real Time Monitoring to 12V voltage, in case overvoltage or under-voltage should reach fault-signal the DSP main control chip immediately, so that main control chip is made corresponding actions, with the normal working performance of protection electric automobile electricity driving governor.But, do not have so far the open report about 12V voltage monitoring circuit in the electric automobile electricity driving governor.
Summary of the invention
The present invention is for avoiding the existing weak point of above-mentioned prior art; 12V voltage monitoring circuit in a kind of electric automobile electricity driving governor is provided; parameter setting by hardware circuit; when 12V voltage surpasses or is lower than the threshold value of setting; circuit is the output low level fault-signal immediately; and fault-signal reached the DSP main control chip, in order to as required it is further processed, to the normal operation of protection controller.
The present invention adopts following scheme for solving above technical problem:
The design feature of 12V voltage monitoring circuit is to comprise in the electric automobile electricity driving governor of the present invention:
One voltage reference arranges circuit, is used for setting overvoltage threshold and the under-voltage threshold value of 12V voltage;
One voltage comparator circuit, the 12V battery tension to be carried out dividing potential drop obtain voltage detection signal, compare output low level fault-signal when described voltage detection signal exceeds overvoltage threshold or under-voltage threshold value with described voltage detection signal and described overvoltage threshold and under-voltage threshold value;
One optical coupling isolation circuit is that the low level fault signal that voltage comparator circuit is exported is carried out level isolation conversion, the level signal of acquisition and DSP main control chip compatibility, and transfer to the DSP main control chip.
The design feature of 12V voltage monitoring circuit also is in the electric automobile electricity driving governor of the present invention:
Described voltage reference arranges circuit and is comprised of 5V reference voltage and resistance R 1, resistance R 2, resistance R 3 and filter capacitor C1 and filter capacitor C2, parameter according to resistance R 1, resistance R 2, resistance R 3 is selected, and sets overvoltage threshold and the under-voltage threshold value of 12V voltage.
Described voltage comparator circuit is that the 12V battery tension is formed window comparator circuit after resistance R 4 and resistance R 5 dividing potential drops, accesses respectively the end of oppisite phase of comparator U1A and the in-phase end of comparator U1B; With the in-phase end of the access of the overvoltage threshold between resistance R 1 and the resistance R 2 at comparator U1A, with the end of oppisite phase of the under-voltage threshold value access between resistance R 2 and the resistance R 3 at comparator U1B.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The present invention can input the 12V voltage status in the Real-Time Monitoring outside; when this voltage overvoltage occurred or when under-voltage; main control chip DSP in time turn-offs output, prevents that related device from still working under the over voltage state, and protection device especially power device IGBT is not damaged.
Description of drawings
Fig. 1 is system block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Referring to Fig. 1, in the present embodiment in the electric automobile electricity driving governor 12V voltage monitoring circuit comprise:
Voltage reference arranges overvoltage threshold and the under-voltage threshold value that circuit is used for setting 12V voltage;
Voltage comparator circuit is to be that the 12V battery tension carries out dividing potential drop and obtains voltage detection signal with the 12V external input voltage, compare output low level fault-signal when described voltage detection signal exceeds overvoltage threshold or under-voltage threshold value with described voltage detection signal and described overvoltage threshold and under-voltage threshold value;
Optical coupling isolation circuit is that the low level fault signal that voltage comparator circuit is exported is carried out level isolation conversion, the level signal of acquisition and DSP main control chip compatibility, and transfer to the DSP main control chip, prevent overtension damage DSP main control chip.
In the implementation, as shown in Figure 2, voltage reference arranges circuit and is comprised of 5V reference voltage and resistance R 1, resistance R 2, resistance R 3 and filter capacitor C1 and filter capacitor C2, selects according to the parameter of resistance R 1, resistance R 2, resistance R 3, sets overvoltage threshold and the under-voltage threshold value of 12V voltage; When the overvoltage threshold of surpass setting when the 12V battery tension and under-voltage threshold value, subsequent conditioning circuit carries out corresponding operating accordingly;
Voltage comparator circuit is that the 12V battery tension is formed window comparator circuit after resistance R 4 and resistance R 5 dividing potential drops, accesses respectively the end of oppisite phase of comparator U1A and the in-phase end of comparator U1B; With the in-phase end of the access of the overvoltage threshold between resistance R 1 and the resistance R 2 at comparator U1A, with the end of oppisite phase of the under-voltage threshold value access between resistance R 2 and the resistance R 3 at comparator U1B.
The 12V battery tension is through the dividing potential drop of resistance R 4 and resistance R 5, make it under normal circumstances, the end of oppisite phase voltage of voltage comparator U1A and the in-phase end voltage of voltage comparator U1B can not surpass overvoltage threshold, the under-voltage threshold value of setting, and wherein capacitor C 3 is used for the clutter that elimination 12V battery tension may contain.
Voltage comparator circuit is comprised of voltage comparator U1, corresponding decoupling capacitor C4, and its specific works principle is as follows:
Under normal operation, because end of oppisite phase 2 pin of voltage comparator U1A and the in-phase end 5 pin input voltages of voltage comparator U1B can be greater than the in-phase end 3 pin voltages of voltage comparator U1A, also can not be lower than end of oppisite phase 6 pin voltage of voltage comparator U1B, so output 1 pin at voltage comparator U1A, also be the output 7 pin output high level signal of voltage comparator U1B, convert the receptible signal of DSP main control chip to through optical coupling isolation circuit; When 12V voltage surpasses in the controller circuitry the receptible maximum input voltage of institute, the in-phase input end 3 pin voltages that surpass voltage comparator U1A because of the 2 pin voltages of voltage comparator U1A, namely surpass overvoltage threshold, comparator U1A is immediately at output 1 pin output low level fault-signal, be input to the DSP main control chip through optical coupling isolation circuit, dsp chip is done further processing to it; In like manner, when the 12V battery tension is lower than in the controller circuitry the receptible minimum voltage of institute, be lower than the end of oppisite phase 6 pin voltages of voltage comparator U1B because of the in-phase end 5 pin voltages of voltage comparator U1B, namely be lower than under-voltage threshold value, at the 7 pin output low level fault-signals of comparator U1B, and then send into follow-up DSP main control chip.
Optical coupling isolation circuit is comprised of photoelectrical coupler U2, former margin leakage resistance R6, filter capacitor C5 and secondary current-limiting resistance R7, when the output 1 pin output 5V of voltage comparator U1A high level normal signal, the former not conducting of limit of photoelectrical coupler U2, because the photoelectrical coupler secondary is received on the 3.3V voltage by resistance R 7, so the high level signal of at this moment secondary 4 pin of photoelectrical coupler U2 output 3.3V is to the DSP main control chip; When the 1 pin output low level fault-signal of voltage comparator U1A, photoelectrical coupler U2 former limit conducting, 4 pin output low level fault-signal VOLT_ERROR of its secondary, and this signal reached the DSP main control chip, further process for the DSP main control chip.
Claims (3)
1. 12V voltage monitoring circuit in the electric automobile electricity driving governor is characterized in that comprising:
One voltage reference arranges circuit, is used for setting overvoltage threshold and the under-voltage threshold value of 12V voltage;
One voltage comparator circuit, the 12V battery tension to be carried out dividing potential drop obtain voltage detection signal, compare output low level fault-signal when described voltage detection signal exceeds overvoltage threshold or under-voltage threshold value with described voltage detection signal and described overvoltage threshold and under-voltage threshold value;
One optical coupling isolation circuit is that the low level fault signal that voltage comparator circuit is exported is carried out level isolation conversion, the level signal of acquisition and DSP main control chip compatibility, and transfer to the DSP main control chip.
2. 12V voltage monitoring circuit in the electric automobile according to claim 1 electricity driving governor, it is characterized in that: described voltage reference arranges circuit and is comprised of 5V reference voltage and resistance R 1, resistance R 2, resistance R 3 and filter capacitor C1 and filter capacitor C2, parameter according to resistance R 1, resistance R 2, resistance R 3 is selected, and sets overvoltage threshold and the under-voltage threshold value of 12V voltage.
3. 12V voltage monitoring circuit in the electric automobile according to claim 2 electricity driving governor, it is characterized in that: described voltage comparator circuit, be that the 12V battery tension is formed window comparator circuit after resistance R 4 and resistance R 5 dividing potential drops, access respectively the end of oppisite phase of comparator U1A and the in-phase end of comparator U1B; With the in-phase end of the access of the overvoltage threshold between resistance R 1 and the resistance R 2 at comparator U1A, with the end of oppisite phase of the under-voltage threshold value access between resistance R 2 and the resistance R 3 at comparator U1B.
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| CN2012105591390A CN103022965A (en) | 2012-12-20 | 2012-12-20 | Monitoring circuit of 12V voltage in electric vehicle electric drive controller |
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| CN2012105591390A CN103022965A (en) | 2012-12-20 | 2012-12-20 | Monitoring circuit of 12V voltage in electric vehicle electric drive controller |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746570A (en) * | 2013-12-31 | 2014-04-23 | 华为技术有限公司 | Rectifier and electric power equipment |
| CN104849644A (en) * | 2014-12-10 | 2015-08-19 | 北汽福田汽车股份有限公司 | IGBT state detecting circuit and IGBT state detecting method |
| CN104999917A (en) * | 2015-04-27 | 2015-10-28 | 长安大学 | Braking failure monitoring device for electric automobile motor |
| CN105305796A (en) * | 2015-10-12 | 2016-02-03 | 重庆凯瑞电动汽车***有限公司 | Frequency converter direct-current busbar overvoltage and under-voltage protection method and system |
| US9306469B2 (en) | 2013-12-31 | 2016-04-05 | Huawei Technologies Co., Ltd. | Rectifier and electrical power facility |
| CN106443146A (en) * | 2016-09-12 | 2017-02-22 | 浙江中控技术股份有限公司 | Master-slave system fault detection and processing system |
| CN107487185A (en) * | 2016-12-26 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric automobile |
| CN108596592A (en) * | 2018-04-19 | 2018-09-28 | 深圳鼎智通讯股份有限公司 | A kind of triggering lock machine method of intelligent terminal |
| CN108725203A (en) * | 2017-04-18 | 2018-11-02 | 福特全球技术公司 | The system and method that high-voltage battery charging is maintained in the case where detecting boosting battery failure |
| CN109194323A (en) * | 2018-11-08 | 2019-01-11 | 常州朗奇威电器有限公司 | Optical coupling isolation circuit and its working method for motor control |
| CN109358295A (en) * | 2018-09-20 | 2019-02-19 | 北京时代民芯科技有限公司 | A kind of power failure indicating circuit applied to DC-DC |
| CN110021993A (en) * | 2019-04-30 | 2019-07-16 | 合肥巨一动力***有限公司 | A kind of anti-down fill system of the power supply of electric machine controller |
| CN111965422A (en) * | 2020-07-22 | 2020-11-20 | 一巨自动化装备（上海）有限公司 | Frequency monitoring circuit |
| CN112083221A (en) * | 2020-10-15 | 2020-12-15 | 珠海格力电器股份有限公司 | Fault detection method and device and electrical equipment |
| 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 |
| CN113093018A (en) * | 2021-03-09 | 2021-07-09 | 北京交通大学 | Lithium ion battery instantaneous internal short circuit detection device and method |
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| US20070035533A1 (en) * | 2005-06-29 | 2007-02-15 | Lg Philips Lcd Co., Ltd. | Protection circuit, flat display device using the same, and method for driving flat display device using the same |
| CN101237137A (en) * | 2007-01-30 | 2008-08-06 | 鸿富锦精密工业（深圳）有限公司 | Over voltage and under-voltage device |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9306469B2 (en) | 2013-12-31 | 2016-04-05 | Huawei Technologies Co., Ltd. | Rectifier and electrical power facility |
| CN103746570A (en) * | 2013-12-31 | 2014-04-23 | 华为技术有限公司 | Rectifier and electric power equipment |
| CN103746570B (en) * | 2013-12-31 | 2017-01-18 | 华为技术有限公司 | Rectifier and electric power equipment |
| CN104849644B (en) * | 2014-12-10 | 2018-02-23 | 北汽福田汽车股份有限公司 | IGBT condition detection circuit and IGBT condition detection methods |
| CN104849644A (en) * | 2014-12-10 | 2015-08-19 | 北汽福田汽车股份有限公司 | IGBT state detecting circuit and IGBT state detecting method |
| CN104999917A (en) * | 2015-04-27 | 2015-10-28 | 长安大学 | Braking failure monitoring device for electric automobile motor |
| CN105305796A (en) * | 2015-10-12 | 2016-02-03 | 重庆凯瑞电动汽车***有限公司 | Frequency converter direct-current busbar overvoltage and under-voltage protection method and system |
| CN106443146A (en) * | 2016-09-12 | 2017-02-22 | 浙江中控技术股份有限公司 | Master-slave system fault detection and processing system |
| CN107487185A (en) * | 2016-12-26 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric automobile |
| CN107487185B (en) * | 2016-12-26 | 2019-09-20 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric car |
| CN108725203A (en) * | 2017-04-18 | 2018-11-02 | 福特全球技术公司 | The system and method that high-voltage battery charging is maintained in the case where detecting boosting battery failure |
| CN108596592A (en) * | 2018-04-19 | 2018-09-28 | 深圳鼎智通讯股份有限公司 | A kind of triggering lock machine method of intelligent terminal |
| CN109358295A (en) * | 2018-09-20 | 2019-02-19 | 北京时代民芯科技有限公司 | A kind of power failure indicating circuit applied to DC-DC |
| CN109194323A (en) * | 2018-11-08 | 2019-01-11 | 常州朗奇威电器有限公司 | Optical coupling isolation circuit and its working method for motor control |
| CN110021993A (en) * | 2019-04-30 | 2019-07-16 | 合肥巨一动力***有限公司 | A kind of anti-down fill system of the power supply of electric machine controller |
| CN111965422A (en) * | 2020-07-22 | 2020-11-20 | 一巨自动化装备（上海）有限公司 | Frequency monitoring circuit |
| CN112083221A (en) * | 2020-10-15 | 2020-12-15 | 珠海格力电器股份有限公司 | Fault detection method and device and electrical equipment |
| 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 |
| CN113093018A (en) * | 2021-03-09 | 2021-07-09 | 北京交通大学 | Lithium ion battery instantaneous internal short circuit detection device and method |
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Application publication date: 20130403 |