CN202949207U - 12V voltage monitoring circuit of electric automobile electric drive controller - Google Patents
12V voltage monitoring circuit of electric automobile electric drive controller Download PDFInfo
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- CN202949207U CN202949207U CN 201220710556 CN201220710556U CN202949207U CN 202949207 U CN202949207 U CN 202949207U CN 201220710556 CN201220710556 CN 201220710556 CN 201220710556 U CN201220710556 U CN 201220710556U CN 202949207 U CN202949207 U CN 202949207U
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Abstract
The present utility model discloses a 12V voltage monitoring circuit of an electric automobile electric drive controller. The circuit is characterized in that a voltage reference setting circuit is used for setting an overvoltage threshold and an under-voltage threshold of 12V voltage; a voltage comparison circuit is used for dividing 12V storage battery voltage to obtain a voltage detection signal, comparing the voltage detection signal with the overvoltage threshold and the under-voltage threshold, and outputting a low level fault signal when the voltage detection signal exceeds the overvoltage threshold or the under-voltage threshold; and an optical coupler isolation circuit for subjecting the low level fault signal output by the voltage comparison circuit to level isolation conversion to obtain a level signal compatible with a DSP master control chip, and transmitting the level signal to the DSP master control chip. When the storage battery voltage is higher or lower than a set threshold, the low level fault signal is output and transmitted to the DSP master control chip, and the controller is protected.
Description
Technical field
The utility model relates to a kind of supervisory circuit that is applied in the 12V input voltage in 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, make main control chip make corresponding actions, with the normal working performance of protection electric automobile electricity driving governor.But, there is no so far the open report about 12V voltage monitoring circuit in electric automobile electricity driving governor.
The utility model content
The utility model 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 during lower than the threshold value set; circuit is the output low level fault-signal immediately; and fault-signal is reached the DSP main control chip, in order to as required it is further processed, to the normal operation of protection controller.
The utility model adopts following scheme for solving above technical problem:
In the utility model electric automobile electricity driving governor, the characteristics of 12V voltage monitoring circuit are to comprise:
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.
In the utility model electric automobile electricity driving governor, the design feature of 12V voltage monitoring circuit also is:
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, select according to the parameter of resistance R 1, resistance R 2, resistance R 3, set 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 resistance R 2 at comparator U1A, with the end of oppisite phase of the under-voltage threshold value access between resistance R 2 and resistance R 3 at comparator U1B.
Compared with the prior art, the utility model beneficial effect is embodied in:
Can the Real-Time Monitoring outside input 12V of the utility model voltage status; 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 utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Referring to Fig. 1, in the present embodiment in electric automobile electricity driving governor the 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 acquisition 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 concrete enforcement, 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 resistance R 2 at comparator U1A, with the end of oppisite phase of the under-voltage threshold value access between resistance R 2 and 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 the in-phase end 5 pin input voltages of end of oppisite phase 2 pin of voltage comparator U1A and voltage comparator U1B can be greater than the in-phase end 3 pin voltages of voltage comparator U1A, can be lower than end of oppisite phase 6 pin voltage of voltage comparator U1B yet, so output 1 pin at voltage comparator U1A, be also the output 7 pin output high level signals of voltage comparator U1B, convert the receptible signal of DSP main control chip to through optical coupling isolation circuit; When 12V voltage surpasses in 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 lower than controller circuitry in institute during receptible minimum voltage, because of the in-phase end 5 pin voltages of the voltage comparator U1B end of oppisite phase 6 pin voltages lower than voltage comparator U1B, namely 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 output 1 pin of voltage comparator U1A is exported 5V high level normal signal, the former not conducting of limit of photoelectrical coupler U2, because the photoelectrical coupler secondary is received on 3.3V voltage by resistance R 7, so secondary 4 pin of photoelectrical coupler U2 are exported the high level signal of 3.3V to the DSP main control chip at this moment; 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 is reached the DSP main control chip, further process for the DSP main control chip.
Claims (3)
1. 12V voltage monitoring circuit in 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 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, select according to the parameter of resistance R 1, resistance R 2, resistance R 3, set overvoltage threshold and the under-voltage threshold value of 12V voltage.
3. 12V voltage monitoring circuit in 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 resistance R 2 at comparator U1A, with the end of oppisite phase of the under-voltage threshold value access between resistance R 2 and resistance R 3 at comparator U1B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220710556 CN202949207U (en) | 2012-12-20 | 2012-12-20 | 12V voltage monitoring circuit of electric automobile electric drive controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220710556 CN202949207U (en) | 2012-12-20 | 2012-12-20 | 12V voltage monitoring circuit of electric automobile electric drive controller |
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| Publication Number | Publication Date |
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| CN202949207U true CN202949207U (en) | 2013-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220710556 Expired - Lifetime CN202949207U (en) | 2012-12-20 | 2012-12-20 | 12V voltage monitoring circuit of electric automobile electric drive controller |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022965A (en) * | 2012-12-20 | 2013-04-03 | 安徽巨一自动化装备有限公司 | Monitoring circuit of 12V voltage in electric vehicle electric drive controller |
| CN103645375A (en) * | 2013-12-31 | 2014-03-19 | 中国船舶重工集团公司第七一一研究所 | Power supply overrunning detection module without reference source |
| CN109613373A (en) * | 2019-01-07 | 2019-04-12 | 蜂巢能源科技有限公司 | High voltage loop of electric automobile protects diagnostic system and diagnostic method and vehicle |
-
2012
- 2012-12-20 CN CN 201220710556 patent/CN202949207U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022965A (en) * | 2012-12-20 | 2013-04-03 | 安徽巨一自动化装备有限公司 | Monitoring circuit of 12V voltage in electric vehicle electric drive controller |
| CN103645375A (en) * | 2013-12-31 | 2014-03-19 | 中国船舶重工集团公司第七一一研究所 | Power supply overrunning detection module without reference source |
| CN109613373A (en) * | 2019-01-07 | 2019-04-12 | 蜂巢能源科技有限公司 | High voltage loop of electric automobile protects diagnostic system and diagnostic method and vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No.5821, Fanfu Avenue, Baohe District, Hefei City, Anhui Province Patentee after: Anhui Juyi Technology Co.,Ltd. Address before: 230051 Anhui Province, Hefei City Industrial Park, Baohe Jianghuai heavy industry base Patentee before: ANHUI JEE AUTOMATION EQUIPMENT Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130522 |
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| CX01 | Expiry of patent term |