CN205231710U - Motor control circuit based on busbar voltage detects - Google Patents
Motor control circuit based on busbar voltage detects Download PDFInfo
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- CN205231710U CN205231710U CN201521065216.2U CN201521065216U CN205231710U CN 205231710 U CN205231710 U CN 205231710U CN 201521065216 U CN201521065216 U CN 201521065216U CN 205231710 U CN205231710 U CN 205231710U
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Abstract
The utility model provides a motor control circuit based on busbar voltage detects, includes: a voltage sampling circuit for keep apart real -time sampling busbar voltage based on light, the 2nd voltage sampling circuit for keep apart real -time sampling busbar voltage based on electric capacity, the treatment circuit is connected respectively a voltage sampling circuit and the 2nd voltage sampling circuit for compare a voltage sampling circuit and the 2nd voltage sampling circuit's sample voltage in real time, and the control motor is shut down when judging according to comparison result that sample voltage is unusual. The utility model discloses utilizes two voltage sampling circuit sampling busbar voltage, realize comparing in real time of sample voltage simultaneously, can judge unusually according to comparison result, in time trigger drive circuit and carry out and shut down the action, and every voltage sampling circuit's isolation principle different that the device of having avoided isolation principle of the same kind triggers the possibility of inefficacy under the same condition, improved the reliability of busbar voltage detection, the reliability and the security that have improved electric automobile by a wide margin.
Description
Technical field
The utility model relate to electric machine controller monitoring field, particularly relate to a kind of reliability higher, for the busbar voltage in controller is carried out closed loop monitoring based on busbar voltage detect circuit for controlling motor.
Background technology
In prior art, the feasible aspect of function is just in for the detection of controller busbar voltage, for the inefficacy of sampling channel and how to respond and do not do corresponding process after losing efficacy.Detection at present for the busbar voltage of Electric Machine Control demand is all adopt single channel sampling to realize, and whether the correctness that busbar voltage detects is directly connected to the running status of motor, be also namely related to vehicle and be in safe operation.Whether the sampled value that the scheme None-identified of single channel sampling is current is correct, and do not have Inspection, the reliability of product is low.
Utility model content
The technical problems to be solved in the utility model is, for the defect that the above-mentioned reliability of prior art is low, provide a kind of reliability higher, for the busbar voltage in controller is carried out closed loop monitoring based on busbar voltage detect circuit for controlling motor.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of circuit for controlling motor detected based on busbar voltage, comprising:
First voltage sampling circuit, for isolating real-time sampling busbar voltage based on light;
Second voltage sampling circuit, for based on Capacitor apart real-time sampling busbar voltage;
Treatment circuit; connect described first voltage sampling circuit and the second voltage sampling circuit respectively; for the sampled voltage of the first voltage sampling circuit and the second voltage sampling circuit is carried out real-time comparison, and control motor stopping when judging that according to comparison result sampled voltage is abnormal.
In the circuit for controlling motor detected based on busbar voltage described in the utility model, described first voltage sampling circuit and the second voltage sampling circuit include and are connected successively:
Voltage conversion circuit, is connected to bus, for busbar voltage being converted to the sampled voltage of the input specification meeting optically coupled isolation circuit;
Buffer circuit, for exporting after sampled voltage isolation;
Differential amplifier circuit, is connected to treatment circuit, amplifies for the sampled voltage exported by buffer circuit the sampled voltage meeting the input specification for the treatment of circuit;
Wherein, the buffer circuit of the first voltage sampling circuit adopts optical coupling isolator, and the buffer circuit of the second voltage sampling circuit adopts Capacitor apart device.
In the circuit for controlling motor detected based on busbar voltage described in the utility model, described voltage conversion circuit comprises the first divider resistance and the second divider resistance, one end of first divider resistance is connected to bus, the other end by the second divider resistance ground connection, and two inputs of described optical coupling isolator/Capacitor apart device connect the two ends of the second divider resistance respectively.
In the circuit for controlling motor detected based on busbar voltage described in the utility model, described differential amplifier circuit comprises: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, operational amplifier;
Two outputs of described optical coupling isolator/Capacitor apart device are connected to two inputs of operational amplifier respectively via the first resistance, the second resistance, the in-phase input end of described operational amplifier is via the 3rd grounding through resistance, the inverting input of described operational amplifier is connected to the output of operational amplifier via the 4th resistance, the output of described operational amplifier is connected to described treatment circuit.
In the circuit for controlling motor detected based on busbar voltage described in the utility model, described treatment circuit comprises:
Microprocessor, connect described first voltage sampling circuit and the second voltage sampling circuit respectively, for the sampled voltage of the first voltage sampling circuit and the second voltage sampling circuit is carried out real-time comparison, and export stopping signal when judging that according to comparison result sampled voltage is abnormal;
Driver, connects microprocessor, for controlling motor stopping when receiving described stopping signal.
Implement the circuit for controlling motor detected based on busbar voltage of the present utility model, there is following beneficial effect: the present invention utilizes two voltage sampling circuit sampling busbar voltages, realize the real-time comparison of sampled voltage simultaneously, exception can be judged according to comparison result, drive circuit can be triggered in time and perform shutdown action, and the separation principle of each voltage sampling circuit is different, the device avoiding similar separation principle triggers the possibility of inefficacy at identical conditions, significantly improve the reliability that busbar voltage detects, improve reliability and the fail safe of electric automobile.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structural representation of the circuit for controlling motor based on busbar voltage detection of the present utility model.
Embodiment
In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
As shown in Figure 1, be the structural representation of circuit for controlling motor detected based on busbar voltage of the present utility model.
The circuit for controlling motor detected based on busbar voltage of the present utility model comprises:
First voltage sampling circuit 1, for isolating real-time sampling busbar voltage based on light;
Second voltage sampling circuit 2, for based on Capacitor apart real-time sampling busbar voltage;
Treatment circuit 3, connect described first voltage sampling circuit 1 and the second voltage sampling circuit 2 respectively, for the sampled voltage MCU-AD2 of the sampled voltage MCU-AD1 of the first voltage sampling circuit 1 and the second voltage sampling circuit 2 is carried out real-time comparison, and export stopping signal when judging that according to comparison result sampled voltage is abnormal;
Concrete, described treatment circuit 3 comprises:
Microprocessor U5, connect described first voltage sampling circuit 1 and the second voltage sampling circuit 2, for the sampled voltage MCU-AD2 of the sampled voltage MCU-AD1 of the first voltage sampling circuit 1 and the second voltage sampling circuit 2 is carried out real-time comparison, the consistency of comparison signal, if both MCU-AD1 and MCU-AD2 difference exceedes certain threshold value, then judge that sampled voltage is abnormal, export stopping signal;
Driver U6, connects microprocessor U5, for controlling motor stopping when receiving described stopping signal.
Wherein, described first voltage sampling circuit 1 and the second voltage sampling circuit 2 include and are connected successively:
Voltage conversion circuit 10, is connected to bus, for busbar voltage Vin being converted to the sampled voltage of the input specification meeting optically coupled isolation circuit 20;
Buffer circuit 20, for exporting after sampled voltage isolation;
Differential amplifier circuit 30, is connected to microprocessor U5, amplifies for the sampled voltage exported by buffer circuit 20 sampled voltage meeting the input specification of microprocessor U5;
First voltage sampling circuit 1 and the second voltage sampling circuit 2 are all at above-mentioned three large basic structure compositions, difference is: one is, the buffer circuit 20 of the first voltage sampling circuit 1 adopts linear optical coupling isolator U1, the buffer circuit 20 of the second voltage sampling circuit 2 adopts the Capacitor apart device U2 of high insulation resistance, because the first voltage sampling circuit 1 is different with both the second voltage sampling circuits 2 separation principle, the device avoiding similar separation principle triggers the possibility of inefficacy at identical conditions, significantly improves the reliability of product; Two are, the conversion multiple of voltage conversion circuit 10, the multiplication factor of differential amplifier circuit 30 adjust according to demand.
Concrete:
Described voltage conversion circuit 10: comprise the first divider resistance R1/R3 and the second divider resistance R2/R4, one end of first divider resistance R1/R3 is connected to bus, the other end by the second divider resistance R2/R4 ground connection, and two inputs of described optical coupling isolator U1/ Capacitor apart device U2 connect the two ends of the second divider resistance R2/R4 respectively.
The basic structure of the voltage conversion circuit 10 of the first voltage sampling circuit 1 and the second voltage sampling circuit 2 is identical, but wherein resistance R2, the R4 of first divider resistance R1, R3 and the second divider resistance set according to follow-up isolating device.
Described differential amplifier circuit 30 comprises: the first resistance R5/R11, the second resistance R6/R12, the 3rd resistance R7/R9, the 4th resistance R8/R10, operational amplifier U3/U4; Two outputs of described optical coupling isolator U1/ Capacitor apart device U2 are connected to two inputs of operational amplifier U3/U4 respectively via the first resistance R5/R11, the second resistance R6/R12, the in-phase input end of described operational amplifier U3/U4 is via the 3rd resistance R5/R11 ground connection, the inverting input of described operational amplifier U3/U4 is connected to the output of operational amplifier U3/U4 via the 4th resistance R8/R10, the output of described operational amplifier U3/U4 is connected to microprocessor U5.
Concrete, two inputs of optical coupling isolator U1 comprise positive input terminal Vin and negative input end SHDN, and two outputs comprise positive output end Vout+ and negative output terminal Vout-, in addition, two earth terminals ground connection respectively, two power ends connect external power supply, as shown in figure VCC.One end of the connection first divider resistance R1 of positive input terminal Vin and the second divider resistance R2 connects, and negative input end SHDN is connected with one end of the ground connection of the second divider resistance R2.Positive output end Vout+ is via the in-phase input end of the first resistance R5 concatenation operation amplifier U3, and negative output terminal Vout-is via the inverting input of the second resistance R6 concatenation operation amplifier U3.
Two inputs of Capacitor apart device U2 comprise positive input terminal AIP and negative input end AIN, and two outputs comprise positive output end AOP and negative output terminal AON, and in addition, two earth terminals ground connection respectively, two power ends connect external power supply, as shown in figure VCC.One end of the connection first divider resistance R3 of positive input terminal AIP and the second divider resistance R4 connects, and negative input end AIN is connected with one end of the ground connection of the second divider resistance R4.Positive output end AOP is via the in-phase input end of the first resistance R11 concatenation operation amplifier U4, and negative output terminal AON is via the inverting input of the second resistance R12 concatenation operation amplifier U4.
In voltage conversion circuit 10 and differential amplifier circuit 30, the resistance of each resistance determines the multiplication factor finally flowing to the signal of microprocessor U5, also the gain of the first voltage sampling circuit 1 and the second voltage sampling circuit 2 is namely determined, preferably, in order to check the program reliability in microprocessor U5 simultaneously, the relation of rigid line gain 1/2 is there is between first voltage sampling circuit 1 and the second voltage sampling circuit 2, namely 2 times of to be gain that the first voltage sampling circuit 1 delivers to the signal of microprocessor U5 be the second voltage sampling circuit 2, the signal that second voltage sampling circuit 2 flows to microprocessor U5 realizes 2 times of gains in microprocessor U5 inside by Software Coding, finally realize the object of the real time contrast of the sampled voltage of the first voltage sampling circuit 1 and the second voltage sampling circuit 2.
Below in conjunction with accompanying drawing 1, explain operation principle of the present utility model with specific embodiment:
Voltage conversion circuit 10 reality that R1, R2 are formed is branch pressure voltage, input signal Vin is converted into the signal meeting U1 input specification, U3 is transferred to by U1 isolation, R5, R6, R7, R8 and U3 form differential amplifier circuit 30, the signal that U1 exports is amplified to the signal meeting U5 input specification and delivers to U5, as shown in MCU-AD1 in figure.In like manner, R3, R4 dividing potential drop, input signal Vin is converted into the signal meeting U2 input specification, U4 is transferred to by U2 isolation, R9, R10, R11, R12 and U4 form differential amplifier circuit 30, the signal that U2 exports is amplified to the signal meeting U5 input specification and delivers to U5, as shown in MCU-AD2 in figure.U5 and U6 forms treatment circuit 3, U5 real time contrast MCU-AD1 and MCU-AD2 two signals, if both differences exceed certain threshold value, then triggers U6 and performs shutdown.
In sum, implement the circuit for controlling motor detected based on busbar voltage of the present utility model, there is following beneficial effect: the present invention utilizes two voltage sampling circuit sampling busbar voltages, realize the real-time comparison of sampled voltage simultaneously, exception can be judged according to comparison result, drive circuit can be triggered in time and perform shutdown action, and the separation principle of each voltage sampling circuit is different, the device avoiding similar separation principle triggers the possibility of inefficacy at identical conditions, significantly improve the reliability that busbar voltage detects, improve reliability and the fail safe of electric automobile.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (5)
1., based on the circuit for controlling motor that busbar voltage detects, it is characterized in that, comprising:
First voltage sampling circuit, for isolating real-time sampling busbar voltage based on light;
Second voltage sampling circuit, for based on Capacitor apart real-time sampling busbar voltage;
Treatment circuit; connect described first voltage sampling circuit and the second voltage sampling circuit respectively; for the sampled voltage of the first voltage sampling circuit and the second voltage sampling circuit is carried out real-time comparison, and control motor stopping when judging that according to comparison result sampled voltage is abnormal.
2. the circuit for controlling motor detected based on busbar voltage according to claim 1, is characterized in that, described first voltage sampling circuit and the second voltage sampling circuit include and be connected successively:
Voltage conversion circuit, is connected to bus, for busbar voltage being converted to the sampled voltage of the input specification meeting optically coupled isolation circuit;
Buffer circuit, for exporting after sampled voltage isolation;
Differential amplifier circuit, is connected to treatment circuit, amplifies for the sampled voltage exported by buffer circuit the sampled voltage meeting the input specification for the treatment of circuit;
Wherein, the buffer circuit of the first voltage sampling circuit adopts optical coupling isolator, and the buffer circuit of the second voltage sampling circuit adopts Capacitor apart device.
3. the circuit for controlling motor detected based on busbar voltage according to claim 2, it is characterized in that, described voltage conversion circuit comprises the first divider resistance and the second divider resistance, one end of first divider resistance is connected to bus, the other end by the second divider resistance ground connection, and two inputs of described optical coupling isolator/Capacitor apart device connect the two ends of the second divider resistance respectively.
4. the circuit for controlling motor detected based on busbar voltage according to claim 2, it is characterized in that, described differential amplifier circuit comprises: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, operational amplifier;
Two outputs of described optical coupling isolator/Capacitor apart device are connected to two inputs of operational amplifier respectively via the first resistance, the second resistance, the in-phase input end of described operational amplifier is via the 3rd grounding through resistance, the inverting input of described operational amplifier is connected to the output of operational amplifier via the 4th resistance, the output of described operational amplifier is connected to described treatment circuit.
5. the circuit for controlling motor detected based on busbar voltage according to claim 1, it is characterized in that, described treatment circuit comprises:
Microprocessor, connect described first voltage sampling circuit and the second voltage sampling circuit respectively, for the sampled voltage of the first voltage sampling circuit and the second voltage sampling circuit is carried out real-time comparison, and export stopping signal when judging that according to comparison result sampled voltage is abnormal;
Driver, connects microprocessor, for controlling motor stopping when receiving described stopping signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521065216.2U CN205231710U (en) | 2015-12-18 | 2015-12-18 | Motor control circuit based on busbar voltage detects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521065216.2U CN205231710U (en) | 2015-12-18 | 2015-12-18 | Motor control circuit based on busbar voltage detects |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205231710U true CN205231710U (en) | 2016-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521065216.2U Expired - Fee Related CN205231710U (en) | 2015-12-18 | 2015-12-18 | Motor control circuit based on busbar voltage detects |
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| Country | Link |
|---|---|
| CN (1) | CN205231710U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752588A (en) * | 2017-11-07 | 2019-05-14 | 上海大郡动力控制技术有限公司 | Electric machine controller DC bus-bar voltage signal sampling and monitoring circuit and method |
| CN110988441A (en) * | 2019-12-25 | 2020-04-10 | 联合汽车电子有限公司 | DC bus voltage monitoring system and method |
| CN113156194A (en) * | 2021-04-23 | 2021-07-23 | 精进电动科技股份有限公司 | Bus voltage sampling circuit of motor controller and motor controller |
-
2015
- 2015-12-18 CN CN201521065216.2U patent/CN205231710U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752588A (en) * | 2017-11-07 | 2019-05-14 | 上海大郡动力控制技术有限公司 | Electric machine controller DC bus-bar voltage signal sampling and monitoring circuit and method |
| CN110988441A (en) * | 2019-12-25 | 2020-04-10 | 联合汽车电子有限公司 | DC bus voltage monitoring system and method |
| CN110988441B (en) * | 2019-12-25 | 2023-11-28 | 联合汽车电子有限公司 | DC bus voltage monitoring system and method |
| CN113156194A (en) * | 2021-04-23 | 2021-07-23 | 精进电动科技股份有限公司 | Bus voltage sampling circuit of motor controller and motor controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20211218 |
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| CF01 | Termination of patent right due to non-payment of annual fee |