WO2019192296A1 - 一种电机控制器绝缘监测电路 - Google Patents

一种电机控制器绝缘监测电路 Download PDF

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Publication number
WO2019192296A1
WO2019192296A1 PCT/CN2019/077979 CN2019077979W WO2019192296A1 WO 2019192296 A1 WO2019192296 A1 WO 2019192296A1 CN 2019077979 W CN2019077979 W CN 2019077979W WO 2019192296 A1 WO2019192296 A1 WO 2019192296A1
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Prior art keywords
filter capacitor
resistor
sampling
amplification conditioning
twenty
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PCT/CN2019/077979
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English (en)
French (fr)
Inventor
屈玉霞
万富翔
谭玲玲
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精进电动科技股份有限公司
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Application filed by 精进电动科技股份有限公司 filed Critical 精进电动科技股份有限公司
Priority to US15/733,650 priority Critical patent/US11448681B2/en
Priority to EP19782066.5A priority patent/EP3734386A4/en
Priority to JP2020551919A priority patent/JP7170056B2/ja
Publication of WO2019192296A1 publication Critical patent/WO2019192296A1/zh

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0428—Safety, monitoring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling

Definitions

  • the invention relates to the technical field of electric motor controllers, and in particular to a motor controller insulation monitoring circuit.
  • motor controllers are the core components of the vehicle's power, which is especially important for its safety. Insulation fault can seriously affect the safety of the motor controller and the whole vehicle. Therefore, it is necessary to monitor the insulation fault. At present, most of the motor controller insulation monitoring circuits are more complicated and costly, which cannot meet the actual needs.
  • the invention provides a motor controller insulation monitoring circuit to solve the problem of high complexity and complexity of the existing circuit.
  • a motor controller insulation monitoring circuit comprising: a first voltage sampling circuit and a second voltage sampling circuit;
  • the first voltage sampling circuit is connected to the bus input positive pole, the bus input negative pole and the bus voltage sampling signal line, and the bus voltage sampling signal is connected to the motor controller;
  • the second voltage sampling circuit is connected to the bus input positive pole, the bus input negative pole and the insulated voltage sampling signal line, and the insulation voltage sampling signal is connected to the motor controller;
  • the motor controller compares the bus voltage value collected by the first voltage sampling circuit with the insulation voltage value collected by the second voltage sampling circuit, and when the bus voltage value and the insulation voltage value are inconsistent, an insulation monitoring alarm signal is issued.
  • the first voltage sampling circuit includes: a first optical coupler, a first operational amplifier, and a second sampling resistor sequentially connected in series, a third sampling resistor, a fourth sampling resistor, a fifth sampling resistor, and a sixth sampling Resistance, seventh sampling resistor, eighth sampling resistor;
  • One end of the second sampling resistor is connected to the bus input positive pole
  • One end of the eighth sampling resistor is connected in series with an eleventh sampling resistor and connected to the negative input of the busbar;
  • the other end of the eighth sampling resistor is connected to the signal input end of the first optical coupler
  • a signal output cathode of the first optocoupler is coupled to an inverting input of the first operational amplifier
  • a signal output anode of the first optocoupler is coupled to a non-inverting input of the first operational amplifier
  • An output of the first operational amplifier is coupled to a bus voltage sampling signal line.
  • the first voltage sampling circuit further includes: a filter capacitor and an amplification conditioning resistor;
  • the filter capacitor includes a first filter capacitor, a second filter capacitor, a third filter capacitor, a fourth filter capacitor, a fifth filter capacitor, and a sixth filter capacitor;
  • the amplification conditioning resistor comprises: a first amplification conditioning resistor, a ninth amplification conditioning resistor, a tenth amplification conditioning resistor and a twelfth amplification conditioning resistor;
  • One end of the first filter capacitor is connected to the bus voltage sampling signal line and one end of the first amplification conditioning resistor;
  • the other end of the first filter capacitor is connected to one end of the first amplification conditioning resistor, and is connected to one end of the ninth amplification conditioning resistor, and one end of the ninth amplification conditioning resistor is further connected to the first operation Connecting the inverting input of the amplifier;
  • the other end of the ninth amplification conditioning resistor is connected to the signal output negative pole of the first optical coupler
  • One end of the second filter capacitor is connected to an output power supply end of the first optical coupler
  • the other end of the second filter capacitor is grounded
  • One end of the third filter capacitor is connected to an input power supply end of the first optical coupler
  • the other end of the third filter capacitor is connected to the other end of the fourth filter capacitor and grounded;
  • One end of the fourth filter capacitor is connected to a signal input end of the first optical coupler
  • One end of the fifth filter capacitor is connected to one end of the tenth amplification conditioning resistor and the non-inverting input end of the first operational amplifier;
  • the other end of the fifth filter capacitor is connected to one end of the twelfth amplification conditioning resistor and grounded;
  • the other end of the tenth amplification conditioning resistor is connected to the positive output of the signal output of the first optical coupler
  • the other end of the twelfth amplification conditioning resistor is connected to the non-inverting input of the first operational amplifier
  • One end of the sixth filter capacitor is connected to a power supply end of the first operational amplifier, and the other end of the sixth filter capacitor is grounded.
  • the second voltage sampling circuit comprises: a second optical coupler, a second operational amplifier, and a fourteenth sampling resistor connected in series, a fifteenth sampling resistor, a twenty-first sampling resistor, and a sixteenth sampling Resistance, the seventeenth sampling resistor, the eighteenth sampling resistor, the nineteenth sampling resistor, the twentieth sampling resistor, the twenty-first sampling resistor, the twenty-second sampling resistor, the twenty-third sampling resistor, the twentieth Four sampling resistors, a twenty-fifth sampling resistor, a twenty-sixth sampling resistor, and a twenty-seventh sampling resistor;
  • One end of the fourteenth sampling resistor is connected to the bus input positive pole
  • One end of the twentieth sampling resistor is connected to one end of the second eleventh sampling resistor and grounded.
  • One end of the twenty-seventh sampling resistor is connected in series with a thirtieth sampling resistor and connected to the bus input negative pole;
  • the other end of the twenty-seventh sampling resistor is connected to the signal input end of the second optical coupler
  • a signal output negative electrode of the second optical coupler is connected to an inverting input end of the second operational amplifier
  • a signal output anode of the second optocoupler is coupled to the non-inverting input of the second operational amplifier
  • the output of the second operational amplifier is connected to an insulated voltage sampling signal line.
  • the second voltage sampling circuit further includes: a seventh filter capacitor, an eighth filter capacitor, a ninth filter capacitor, a tenth filter capacitor, an eleventh filter capacitor, a thirteenth amplification conditioning resistor, and a twentieth Eight amplification conditioning resistors, twenty-ninth amplification conditioning resistors and thirty-first amplification conditioning resistors;
  • One end of the seventh filter capacitor is connected to one end of the thirteenth amplification conditioning resistor and the insulation voltage sampling signal line;
  • the other end of the seventh filter capacitor is connected to the other end of the thirteenth amplification conditioning resistor, and is connected to one end of the twenty-eighth amplification conditioning resistor, and one end of the twenty-eighth amplification conditioning resistor is further Connecting the inverting input terminals of the second operational amplifier;
  • the other end of the twenty-eighth amplification conditioning resistor is connected to the signal output cathode of the second photocoupler;
  • One end of the eighth filter capacitor is connected to an output power supply end of the second optical coupler
  • the other end of the eighth filter capacitor is grounded
  • One end of the ninth filter capacitor is connected to an input power supply end of the second photocoupler
  • the other end of the ninth filter capacitor is connected to the other end of the tenth filter capacitor and grounded;
  • One end of the tenth filter capacitor is connected to the other end of the twenty-seventh sampling resistor and the signal input end of the second photocoupler;
  • One end of the eleventh filter capacitor is connected to one end of the twenty-ninth amplification conditioning resistor and the non-inverting input end of the second operational amplifier;
  • the other end of the eleventh filter capacitor is connected to one end of the 31st amplification conditioning resistor and grounded;
  • the other end of the twenty-ninth amplification conditioning resistor is connected to the positive output of the signal output of the second optical coupler
  • the other end of the thirty-first amplification conditioning resistor is coupled to the non-inverting input of the second operational amplifier.
  • a power converter is further included;
  • the voltage converter comprises: a power conversion chip, a twelfth filter capacitor, a thirteenth filter capacitor, a fourteenth filter capacitor and a fifteenth filter capacitor;
  • the input end of the power conversion chip is connected to a power source, one end of the twelfth filter capacitor, and one end of the thirteenth filter capacitor;
  • the other end of the twelfth filter capacitor is connected to the other end of the thirteenth filter capacitor and grounded;
  • An output end of the power conversion chip is connected to an input power supply end of the first optical coupler
  • the output end of the power conversion chip is further connected to one end of the fourteenth filter capacitor and one end of the fifteenth filter capacitor;
  • the other end of the fourteenth filter capacitor is connected to the other end of the fifteenth filter capacitor and grounded.
  • a power converter is further included;
  • the voltage converter comprises: a power conversion chip, a twelfth filter capacitor, a thirteenth filter capacitor, a fourteenth filter capacitor and a fifteenth filter capacitor;
  • the input end of the power conversion chip is connected to a power source, one end of the twelfth filter capacitor, and one end of the thirteenth filter capacitor;
  • the other end of the twelfth filter capacitor is connected to the other end of the thirteenth filter capacitor and grounded;
  • An output end of the power conversion chip is connected to an input power supply end of the second optical coupler
  • the output end of the power conversion chip is further connected to one end of the fourteenth filter capacitor and one end of the fifteenth filter capacitor;
  • the other end of the fourteenth filter capacitor is connected to the other end of the fifteenth filter capacitor and grounded.
  • the invention has the beneficial effects that the motor controller insulation monitoring circuit of the embodiment of the invention separately collects the bus voltage and the insulation voltage by using two voltage sampling circuits, and compares the values of the two, and if the values of the two are inconsistent, the insulation is issued.
  • the alarm signal is monitored to ensure the safety of the motor controller and the safety of the whole vehicle.
  • the insulation monitoring circuit of this embodiment is simple, practical, and low in cost, and meets actual needs.
  • FIG. 1 is a schematic diagram of an insulation monitoring circuit for a motor controller according to an embodiment of the present invention.
  • the design concept of the present invention is: for the problem that the existing motor controller circuit has high complexity and high cost, the embodiment of the invention provides a motor controller insulation monitoring circuit, when the motor controller busbar is negatively connected to the ground and the impedance insulation is poor, The controller detects and judges the alarm through the insulation monitoring circuit, and can report the insulation fault to the vehicle controller. This ensures that the vehicle controller can upload the fault to the instrument panel in time so that the driver can see the safety of the passenger in time.
  • the motor controller insulation monitoring circuit of the embodiment comprises: a first voltage sampling circuit and a second voltage sampling circuit; the first voltage sampling circuit is connected with the bus input positive pole, the bus input negative pole and the bus voltage sampling signal line, and the bus voltage sampling signal Connected to the motor controller; the second voltage sampling circuit is connected with the bus input positive pole, the bus input negative pole and the insulated voltage sampling signal line, the insulation voltage sampling signal is connected to the motor controller; the motor controller compares the busbar collected by the first voltage sampling circuit The voltage value and the insulation voltage value collected by the second voltage sampling circuit, when the bus voltage value and the insulation voltage value are inconsistent, an insulation monitoring alarm signal is issued.
  • the circuit structure is simple and practical, and the cost is low, which satisfies the actual needs.
  • the motor controller includes an electric vehicle battery, and includes a bus bar connected to the electric vehicle battery, and the bus bar functions to collect, distribute, and transmit electrical energy.
  • the bus voltage is the voltage on the rectangular or circular bus bar
  • the positive and negative bus is the bus for power supply
  • the negative bus and positive bus form the loop for the load power supply.
  • FIG. 1 is a schematic diagram of an insulation monitoring circuit for a motor controller according to an embodiment of the present invention.
  • the motor controller insulation monitoring circuit of the present embodiment will be described below with reference to FIG.
  • the motor controller insulation monitoring circuit of this embodiment includes a first voltage sampling circuit, a second voltage sampling circuit and a voltage converter;
  • the first voltage sampling circuit includes: a first optical coupler U3, a first operational amplifier, and a second sampling resistor R2, a third sampling resistor R3, a fourth sampling resistor R4, and a fifth sampling resistor R5. a sixth sampling resistor R6, a seventh sampling resistor R7, and an eighth sampling resistor R8;
  • One end of the second sampling resistor R2 is connected to the bus input positive +VBUS;
  • the eighth sampling resistor R8 is connected in series with an eleventh sampling resistor R11 and connected to the bus input negative terminal; PGND is connected to the high voltage bus input negative terminal.
  • the other end of the eighth sampling resistor R8 is connected to the signal input terminal Vin of the first optical coupler U1.
  • the signal output negative terminal VOUT- of the first optical coupler U1 is connected to the inverting input terminal (ie, pin 2) of the first operational amplifier (ie, the operational amplifier 1).
  • the signal output positive terminal VOUT+ of the first optical coupler U1 is connected to the non-inverting input terminal (ie, the pin 3) of the first operational amplifier,
  • the output of the first operational amplifier (ie, pin 1) is connected to the bus voltage sampling signal HV_VDC line.
  • the bus voltage sampling signal HV_VDC is connected to the motor controller MCU (not shown in Figure 1).
  • the SHDN of the first optocoupler U1 refers to the external high-power shutdown pin
  • GND1 refers to the input power supply ground pin
  • the first voltage sampling circuit further includes: a filter capacitor and an amplification conditioning resistor;
  • the filter capacitor includes a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, a fourth filter capacitor C4, a fifth filter capacitor C5 and a sixth filter capacitor C6;
  • the amplification conditioning resistor comprises: a first amplification conditioning resistor R1, a ninth amplification conditioning resistor R9, a tenth amplification conditioning resistor R10 and a twelfth amplification conditioning resistor R12;
  • One end of the first filter capacitor C1 is connected to one end of the bus voltage sampling signal HV_VDC line and the first amplification conditioning resistor R1.
  • the other end of the first filter capacitor C1 is connected to the other end of the first amplification conditioning resistor R1 and is connected to one end of the ninth amplification conditioning resistor R9.
  • One end of the ninth amplification conditioning resistor R9 is also connected to the inverting input terminal of the first operational amplifier. (ie pin 2) connected;
  • the other end of the ninth amplification conditioning resistor R9 is connected to the signal output cathode VOUT- of the first photocoupler U1;
  • One end of the second filter capacitor C2 is connected to the output power supply terminal VDD2 of the first photocoupler U1;
  • the other end of the second filter capacitor C2 is grounded (ie, analog ground AGND);
  • One end of the third filter capacitor C3 is connected to the input power supply terminal VDD1 of the first photocoupler U1;
  • the other end of the third filter capacitor C3 is connected to the other end of the fourth filter capacitor C4 and grounded (ie, PGND);
  • One end of the fourth filter capacitor C4 is connected to the signal input terminal Vin of the first photocoupler U1;
  • One end of the fifth filter capacitor C5 is connected to one end of the tenth amplification conditioning resistor R10 and the non-inverting input terminal (pin 3) of the first operational amplifier;
  • the other end of the fifth filter capacitor C5 is connected to one end of the twelfth amplification conditioning resistor R12 and grounded;
  • the other end of the tenth amplification conditioning resistor R10 is connected to the signal output positive terminal VOUT+ of the first optical coupler U1;
  • the other end of the twelfth amplification conditioning resistor R12 is connected to the non-inverting input terminal of the first operational amplifier
  • One end of the sixth filter capacitor C6 is connected to the power supply terminal (5VA) of the first operational amplifier, and the other end of the sixth filter capacitor C6 is grounded (ie, analog ground AGND).
  • the first voltage sampling circuit includes a plurality of sampling resistors, because the insulation resistance of the positive and negative pairs of the busbars must satisfy the ohmic level or higher, and the insulation resistance of the positive and negative pairs of the busbars is matched, so Connect more resistors and indirectly in the resistor.
  • the second voltage sampling circuit includes: a second optical coupler U3, a second operational amplifier, and a fourteenth sampling resistor R14 connected in series, a fifteenth sampling resistor R15, a sixteenth sampling resistor R16, and a seventeenth Sampling resistor R17, eighteenth sampling resistor R18, nineteenth sampling resistor R19, twentieth sampling resistor R20, twenty-first sampling resistor R21, twenty-second sampling resistor R22, twenty-third sampling resistor R23, Twenty-four sampling resistor R24, twenty-fifth sampling resistor R25, twenty-sixth sampling resistor R26 and twenty-seven sampling resistor R27;
  • One end of the fourteenth sampling resistor R14 is connected to the bus input positive +VBUS;
  • One end of the twentieth sampling resistor R20 is connected to one end of the second eleventh sampling resistor R21 and grounded GROUND, that is, the midpoint of the circuit is connected to the ground.
  • One end of the twenty-seventh sampling resistor R27 is connected in series with a thirtieth sampling resistor R30 and is connected to the bus input negative terminal PGND; see FIG. 1, one end of the thirtieth sampling resistor R30 and one end of the twenty-seventh sampling resistor R27 and the first One end of the twenty-sixth sampling resistor R26 is connected, and the other end of the thirtieth sampling resistor R30 is connected to the bus input negative pole PGND.
  • the other end of the twenty-seventh sampling resistor R27 is connected to the signal input terminal Vin of the second photocoupler U3.
  • the signal output negative terminal VOUT- of the second optical coupler U3 is connected to the inverting input terminal (pin 6) of the second operational amplifier,
  • the signal output positive terminal VOUT+ of the second optical coupler U3 is connected to the non-inverting input terminal (pin 5) of the second operational amplifier,
  • the output of the second operational amplifier (pin 7) is connected to the insulated voltage sampling signal HV_VISO line.
  • the HV_VISO line is connected to the motor controller MCU.
  • the resistance of the sampling resistor of the second voltage sampling circuit of the embodiment is much larger than the ground insulation resistance threshold required by the design. Since the circuit resistance uses a small resistance value, if the positive and negative bus bars change the insulation resistance of the case, the sampling voltage is not easily reflected. See the national standard for the impedance threshold of the ground insulation.
  • the second voltage sampling circuit further includes: a seventh filter capacitor C7, an eighth filter capacitor C8, a ninth filter capacitor C9, a tenth filter capacitor C10, an eleventh filter capacitor C11, and a thirteenth amplification conditioner R13. , the twenty-eighth amplification conditioning resistor R28, the twenty-ninth amplification conditioning resistor R29 and the thirty-first amplification conditioning resistor R31;
  • One end of the seventh filter capacitor C7 is connected to one end of the thirteenth amplification conditioning resistor R13 and the insulation voltage sampling signal HV_VISO line;
  • the other end of the seventh filter capacitor C7 is connected to the other end of the thirteenth amplification conditioning resistor R13, and is connected to one end of the twenty-eighth amplification conditioning resistor R28.
  • One end of the twenty-eighth amplification conditioning resistor R28 is also connected to the second operational amplifier.
  • the inverting input (pin 6) is connected;
  • the other end of the twenty-eighth amplification conditioning resistor R28 is connected to the signal output cathode VOUT- of the second photocoupler U3;
  • One end of the eighth filter capacitor C8 is connected to the output power supply terminal VDD2 of the second photocoupler U3;
  • One end of the ninth filter capacitor C9 is connected to the input power supply terminal VDD1 of the second photocoupler U3;
  • the other end of the ninth filter capacitor C9 is connected to the other end of the tenth filter capacitor C10 and grounded;
  • One end of the tenth filter capacitor C10 is connected to the other end of the twenty-seventh sampling resistor R27 and the signal input terminal Vin of the second photocoupler U3;
  • One end of the eleventh filter capacitor C11 is connected to one end of the twenty-ninth amplification conditioning resistor R29 and the non-inverting input terminal (pin 5) of the second operational amplifier;
  • the other end of the eleventh filter capacitor C11 is connected to one end of the 31st amplification conditioning resistor R31 and grounded;
  • the other end of the twenty-ninth amplification conditioning resistor R29 is connected to the signal output positive VOUT+ of the second photocoupler U3;
  • the other end of the thirty-first amplification conditioning resistor R31 is coupled to the non-inverting input of the second operational amplifier.
  • the motor controller insulation monitoring circuit of this embodiment further includes a power converter
  • the voltage converter comprises: a power conversion chip U4, a twelfth filter capacitor C12, a thirteenth filter capacitor C13, a fourteenth filter capacitor C14 and a fifteenth filter capacitor C15;
  • the input end (pin 1) of the power conversion chip is connected to the power source, one end of the twelfth filter capacitor C12, and one end of the thirteenth filter capacitor C13;
  • the other end of the twelfth filter capacitor C12 is connected to the other end of the thirteenth filter capacitor C13 and grounded;
  • the output end (pin 1) of the power conversion chip U4 is connected to the input power supply terminal VDD1 of the first photocoupler U1;
  • the output end of the power conversion chip (pin 1) is also connected to one end of the fourteenth filter capacitor and one end of the fifteenth filter capacitor;
  • the other end of the fourteenth filter capacitor C14 is connected to the other end of the fifteenth filter capacitor C15 and grounded.
  • the output end of the power conversion chip U4 is connected to the input power supply terminal VDD1 of the second photocoupler U3.
  • Vin1 Vbus/[(R2+R3+R4+R5+R6+R7+R11)*R11], where * represents multiplication.
  • Vad1 Vin*K1
  • the second voltage sampling circuit, the voltage of the input photocoupler U3 is:
  • R14+...R26 means:
  • Vad2 Vin2*K2
  • the voltage sample value of the second voltage sampling circuit is calculated as follows:
  • R14+...R20 represents: R14+R15+R16+R17+R18+R19+R20.
  • R21+...R26 represents: R21+R22+R23+R24+R25+R26.
  • the bus voltage Vbus3 derived from the acquired voltage value Vad3 must be greater than the Vbus1 derived by the first voltage sampling circuit, whereby the motor controller insulation fault can be determined.
  • the first voltage sampling circuit is a high voltage bus voltage sampling circuit, which is directly connected to the bus voltage and serially connected to the voltage divider sampling.
  • the busbar When the busbar is short-circuited in positive or negative ground, the resistance on the circuit is shorted, so the voltage at the sampling terminal will change.
  • the voltage of the first busbar it can be judged that the positive and negative insulation of the busbar does not meet the requirements. An insulation fault has occurred.
  • the motor controller insulation monitoring circuit of the embodiment has a simple structure, strong practicability and low cost. Convenient for large-scale promotion of applications. And can monitor the motor controller insulation fault to ensure the safety of the motor controller and the whole vehicle.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electric Motors In General (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

一种电机控制器绝缘监测电路，包括：第一电压采样电路和第二电压采样电路；第一电压采样电路与母线输入正极(+VBUS)、母线输入负极(PGND)以及母线电压采样信号(HV_VDC)线连接，母线电压采样信号(HV_VDC)连接至电机控制器；第二电压采样电路与母线输入正极(+VBUS)、母线输入负极(PGND)以及绝缘电压采样信号(HV_VISO)线连接，绝缘电压采样信号(HV_VISO)连接至电机控制器；电机控制器，比较第一电压采样电路采集的母线电压值与第二电压采样电路采集的绝缘电压值，当母线电压值与绝缘电压值不一致时，则发出绝缘监测报警信号。电机控制器绝缘监测电路简单、实用、成本低，满足了实际需求。

Description

一种电机控制器绝缘监测电路 技术领域
本发明涉及电动汽车电机控制器技术领域，具体涉及一种电机控制器绝缘监测电路。
发明背景
在汽车动力等领域，电机控制器作为整车动力的核心部件，对于其控制安全尤为重要。绝缘故障能够严重影响电机控制器以及整车的安全，因此需要对绝缘故障进行监测，而目前大多数电机控制器绝缘监测电路较为复杂，且成本较高，不能满足实际需求。
发明内容
本发明提供了一种电机控制器绝缘监测电路，以解决现有电路复杂成本高的问题。
根据本发明的一个方面，提供了一种电机控制器绝缘监测电路，包括：第一电压采样电路和第二电压采样电路；
第一电压采样电路与母线输入正极，母线输入负极以及母线电压采样信号线连接，所述母线电压采样信号连接至电机控制器；
第二电压采样电路与母线输入正极，母线输入负极以及绝缘电压采样信号线连接，所述绝缘电压采样信号连接至电机控制器；
所述电机控制器，比较第一电压采样电路采集的母线电压值与第二电压采样电路采集的绝缘电压值，当母线电压值与绝缘电压值不一致时，则发出绝缘监测报警信号。
可选地，所述第一电压采样电路包括：第一光耦合器，第一运算放大器以及依次串联的第二采样电阻，第三采样电阻，第四采样电阻，第五采样电阻，第六采样电阻，第七采样电阻，第八采样电阻；
所述第二采样电阻的一端与母线输入正极连接；
所述第八采样电阻的一端串联一第十一采样电阻后与母线输入负极连接；
所述第八采样电阻的另一端与所述第一光耦合器的信号输入端连接，
所述第一光耦合器的信号输出负极与所述第一运算放大器的反相输入端连接，
所述第一光耦合器的信号输出正极与所述第一运算放大器的同相输入端连接，
所述第一运算放大器的输出端与母线电压采样信号线连接。
可选地，所述第一电压采样电路还包括：滤波电容和放大调理电阻；
所述滤波电容包括第一滤波电容，第二滤波电容，第三滤波电容，第四滤波电 容，第五滤波电容和第六滤波电容；
所述放大调理电阻包括：第一放大调理电阻，第九放大调理电阻，第十放大调理电阻和第十二放大调理电阻；
所述第一滤波电容的一端与所述母线电压采样信号线以及所述第一放大调理电阻的一端连接；
所述第一滤波电容的另一端与所述第一放大调理电阻的另一端连接后与所述第九放大调理电阻的一端连接，所述第九放大调理电阻的一端还与所述第一运算放大器的反相输入端连接；
所述第九放大调理电阻的另一端与所述第一光耦合器的信号输出负极连接；
所述第二滤波电容的一端与所述第一光耦合器的输出电源供电端连接；
所述第二滤波电容的另一端接地；
所述第三滤波电容的一端与所述第一光耦合器的输入电源供电端连接；
所述第三滤波电容的另一端与所述第四滤波电容的另一端连接后接地；
所述第四滤波电容的一端与所述第一光耦合器的信号输入端连接；
所述第五滤波电容的一端与所述第十放大调理电阻的一端以及所述第一运算放大器的同相输入端连接；
所述第五滤波电容的另一端与所述第十二放大调理电阻的一端连接后接地；
所述第十放大调理电阻的另一端与所述第一光耦合器的信号输出正极连接；
所述第十二放大调理电阻的另一端与所述第一运算放大器的同相输入端连接；
所述第六滤波电容的一端与所述第一运算放大器的电源供电端连接，所述第六滤波电容的另一端接地。
可选地，所述第二电压采样电路包括：第二光耦合器，第二运算放大器以及依次串联的第十四采样电阻，第十五采样电阻，第二十一采样电阻，第十六采样电阻，第十七采样电阻，第十八采样电阻，第十九采样电阻，第二十采样电阻，第二十一采样电阻，第二十二采样电阻，第二十三采样电阻，第二十四采样电阻，第二十五采样电阻，第二十六采样电阻和第二十七采样电阻；
所述第十四采样电阻的一端与母线输入正极连接；
所述第二十采样电阻的一端与第二十一采样电阻的一端共接后接地，
所述第二十七采样电阻的一端串联一第三十采样电阻后与母线输入负极连接；
所述第二十七采样电阻的另一端与所述第二光耦合器的信号输入端连接，
所述第二光耦合器的信号输出负极与所述第二运算放大器的反相输入端连接，
所述第二光耦合器的信号输出正极与所述第二运算放大器的同相输入端连接，
所述第二运算放大器的输出端与绝缘电压采样信号线连接。
可选地，所述第二电压采样电路还包括：第七滤波电容，第八滤波电容，第九滤波电容，第十滤波电容，第十一滤波电容，第十三放大调理电阻，第二十八放大调理电阻，第二十九放大调理电阻以及第三十一放大调理电阻；
所述第七滤波电容的一端与所述第十三放大调理电阻的一端以及所述绝缘电压采样信号线连接；
所述第七滤波电容的另一端与所述第十三放大调理电阻的另一端连接后与所 述第二十八放大调理电阻的一端连接，所述第二十八放大调理电阻的一端还与所述第二运算放大器的反相输入端连接；
所述第二十八放大调理电阻的另一端与所述第二光耦合器的信号输出负极连接；
所述第八滤波电容的一端与所述第二光耦合器的输出电源供电端连接；
所述第八滤波电容的另一端接地；
所述第九滤波电容的一端与所述第二光耦合器的输入电源供电端连接；
所述第九滤波电容的另一端与所述第十滤波电容的另一端连接后接地；
所述第十滤波电容的一端与所述第二十七采样电阻的另一端以及所述第二光耦合器的信号输入端连接；
所述第十一滤波电容的一端与所述第二十九放大调理电阻的一端以及所述第二运算放大器的同相输入端连接；
所述第十一滤波电容的另一端与所述第三十一放大调理电阻的一端连接后接地；
所述第二十九放大调理电阻的另一端与所述第二光耦合器的信号输出正极连接；
所述第三十一放大调理电阻的另一端与所述第二运算放大器的同相输入端连接。
可选地，还包括电源转换器；
电压转换器包括：电源转换芯片，第十二滤波电容，第十三滤波电容，第十四滤波电容以及第十五滤波电容；
所述电源转换芯片的输入端与电源，第十二滤波电容的一端以及第十三滤波电容的一端连接；
第十二滤波电容的另一端与第十三滤波电容的另一端共接后接地；
所述电源转换芯片的输出端与所述第一光耦合器的输入端电源供电端连接；
所述电源转换芯片的输出端还与所述第十四滤波电容的一端，所述第十五滤波电容的一端连接；
所述第十四滤波电容的另一端与所述第十五滤波电容的另一端共接后接地。
可选地，还包括电源转换器；
电压转换器包括：电源转换芯片，第十二滤波电容，第十三滤波电容，第十四滤波电容以及第十五滤波电容；
所述电源转换芯片的输入端与电源，第十二滤波电容的一端以及第十三滤波电容的一端连接；
第十二滤波电容的另一端与第十三滤波电容的另一端共接后接地；
所述电源转换芯片的输出端与所述第二光耦合器的输入端电源供电端连接；
所述电源转换芯片的输出端还与所述第十四滤波电容的一端，所述第十五滤波电容的一端连接；
所述第十四滤波电容的另一端与所述第十五滤波电容的另一端共接后接地。
本发明的有益效果是：本发明实施例的电机控制器绝缘监测电路，通过采用两路电压采样电路分别采集母线电压和绝缘电压并比较两者的值，如果两者的值不一致，则发出绝缘监测报警信号，保证了电机控制器的安全和整车安全，本实施例的绝缘监测电路，简单、实用、成本低，满足了实际需求。
附图简要说明
图1是本发明一个实施例的电机控制器绝缘监测电路示意图。
实施本发明的方式
本发明的设计构思是：针对现有电机控制器电路复杂成本高的问题，本发明实施例提供了一种电机控制器绝缘监测电路，在电机控制器母线正负对地发生阻抗绝缘不良时，控制器通过绝缘监测电路检测判断发出警报，并可以向整车控制器上报绝缘故障，这样可以保证整车控制器能够及时把故障上传到仪表盘使驾驶员及时看到保证乘车人员的安全。
本实施例的电机控制器绝缘监测电路，包括：第一电压采样电路和第二电压采样电路；第一电压采样电路与母线输入正极，母线输入负极以及母线电压采样信号线连接，母线电压采样信号连接至电机控制器；第二电压采样电路与母线输入正极，母线输入负极以及绝缘电压采样信号线连接，绝缘电压采样信号连接至电机控制器；电机控制器，比较第一电压采样电路采集的母线电压值与第二电压采样电路采集的绝缘电压值，当母线电压值与绝缘电压值不一致时，则发出绝缘监测报警信号。电路结构简单实用，并且成本低，满足了实际需求。一般的，电机控制器包括电动车电池，还包括与电动车电池连接的母线，母线的作用是汇集、分配和传送电能。母线电压就是矩形或圆形母线排上的电压，正负母线是供电的总线，负母线和正母线构成回路，供给负载电源。
图1是本发明一个实施例的电机控制器绝缘监测电路示意图，下面结合图1对本实施例的电机控制器绝缘监测电路进行说明。
本实施例的电机控制器绝缘监测电路包括第一电压采样电路，第二电压采样电路和电压转换器；
参见图1，第一电压采样电路包括：第一光耦合器U3，第一运算放大器以及依次串联的第二采样电阻R2，第三采样电阻R3，第四采样电阻R4，第五采样电阻R5，第六采样电阻R6，第七采样电阻R7，第八采样电阻R8；
第二采样电阻R2的一端与母线输入正极+VBUS连接；
第八采样电阻R8的一端串联一第十一采样电阻R11后与母线输入负极连接；PGND连接到高压母线输入负极。
第八采样电阻R8的另一端与第一光耦合器U1的信号输入端Vin连接，
第一光耦合器U1的信号输出负极VOUT-与第一运算放大器(即，运放1)的 反相输入端(即管脚2)连接，
第一光耦合器U1的信号输出正极VOUT+与第一运算放大器的同相输入端(即管脚3)连接，
第一运算放大器的输出端(即管脚1)与母线电压采样信号HV_VDC线连接。母线电压采样信号HV_VDC连接至电机控制器MCU(图1未示出)。
图1中第一光耦合器U1的SHDN是指外部置高关断引脚，GND1是指输入端电源接地引脚。
参见图1，第一电压采样电路还包括：滤波电容和放大调理电阻；
滤波电容包括第一滤波电容C1，第二滤波电容C2，第三滤波电容C3，第四滤波电容C4，第五滤波电容C5和第六滤波电容C6；
放大调理电阻包括：第一放大调理电阻R1，第九放大调理电阻R9，第十放大调理电阻R10和第十二放大调理电阻R12；
第一滤波电容C1的一端与母线电压采样信号HV_VDC线以及第一放大调理电阻R1的一端连接。
第一滤波电容C1的另一端与第一放大调理电阻R1的另一端连接后与第九放大调理电阻R9的一端连接，第九放大调理电阻R9的一端还与第一运算放大器的反相输入端(即管脚2)连接；
第九放大调理电阻R9的另一端与第一光耦合器U1的信号输出负极VOUT-连接；
第二滤波电容C2的一端与第一光耦合器U1的输出电源供电端VDD2连接；
第二滤波电容C2的另一端接地(即模拟地AGND)；
第三滤波电容C3的一端与第一光耦合器U1的输入电源供电端VDD1连接；
第三滤波电容C3的另一端与第四滤波电容C4的另一端连接后接地(即PGND)；
第四滤波电容C4的一端与第一光耦合器U1的信号输入端Vin连接；
第五滤波电容C5的一端与第十放大调理电阻R10的一端以及第一运算放大器的同相输入端(管脚3)连接；
第五滤波电容C5的另一端与第十二放大调理电阻R12的一端连接后接地；
第十放大调理电阻R10的另一端与第一光耦合器U1的信号输出正极VOUT+连接；
第十二放大调理电阻R12的另一端与第一运算放大器的同相输入端连接；
第六滤波电容C6的一端与第一运算放大器的电源供电端(5VA)连接，第六滤波电容C6的另一端接地(即模拟地AGND)。
需要说明的是，第一电压采样电路包括多个采样电阻，这是由于母线正、负对壳体绝缘阻抗要满足兆欧级以上，为匹配母线正负对壳体的绝缘阻抗，所以要串接较多电阻，且在电阻中间接壳体。
参见图1，第二电压采样电路包括：第二光耦合器U3，第二运算放大器以及依次串联的第十四采样电阻R14，第十五采样电阻R15，第十六采样电阻R16，第十七采样电阻R17，第十八采样电阻R18，第十九采样电阻R19，第二十采样电阻 R20，第二十一采样电阻R21，第二十二采样电阻R22，第二十三采样电阻R23，第二十四采样电阻R24，第二十五采样电阻R25，第二十六采样电阻R26和第二十七采样电阻R27；
第十四采样电阻R14的一端与母线输入正极+VBUS连接；
第二十采样电阻R20的一端与第二十一采样电阻R21的一端共接后接地GROUND，即电路中点接入大地。
第二十七采样电阻R27的一端串联一第三十采样电阻R30后与母线输入负极PGND连接；参见图1，第三十采样电阻R30的一端分别与第二十七采样电阻R27的一端以及第二十六采样电阻R26的一端连接，第三十采样电阻R30的另一端与母线输入负极PGND连接。
第二十七采样电阻R27的另一端与第二光耦合器U3的信号输入端Vin连接，
第二光耦合器U3的信号输出负极VOUT-与第二运算放大器的反相输入端(管脚6)连接，
第二光耦合器U3的信号输出正极VOUT+与第二运算放大器的同相输入端(管脚5)连接，
第二运算放大器的输出端(管脚7)与绝缘电压采样信号HV_VISO线连接。HV_VISO线与电机控制器MCU连接。
为了保证绝缘监测电路的精确度，本实施例的第二电压采样电路的采样电阻的阻值远大于设计要求的对地绝缘阻抗阈值。因为电路电阻采用较小阻值时，如果正负母线对壳体绝缘阻抗改变，采样电压不易被体现。对地绝缘阻抗阈值参见国家标准。
参见图1，第二电压采样电路还包括：第七滤波电容C7，第八滤波电容C8，第九滤波电容C9，第十滤波电容C10，第十一滤波电容C11，第十三放大调理电阻R13，第二十八放大调理电阻R28，第二十九放大调理电阻R29以及第三十一放大调理电阻R31；
第七滤波电容C7的一端与第十三放大调理电阻R13的一端以及绝缘电压采样信号HV_VISO线连接；
第七滤波电容C7的另一端与第十三放大调理电阻R13的另一端连接后与第二十八放大调理电阻R28的一端连接，第二十八放大调理电阻R28的一端还与第二运算放大器的反相输入端(管脚6)连接；
第二十八放大调理电阻R28的另一端与第二光耦合器U3的信号输出负极VOUT-连接；
第八滤波电容C8的一端与第二光耦合器U3的输出电源供电端VDD2连接；
第八滤波电容C8的另一端接地；
第九滤波电容C9的一端与第二光耦合器U3的输入电源供电端VDD1连接；
第九滤波电容C9的另一端与第十滤波电容C10的另一端连接后接地；
第十滤波电容C10的一端与第二十七采样电阻R27的另一端以及第二光耦合器U3的信号输入端Vin连接；
第十一滤波电容C11的一端与第二十九放大调理电阻R29的一端以及第二运 算放大器的同相输入端(管脚5)连接；
第十一滤波电容C11的另一端与第三十一放大调理电阻R31的一端连接后接地；
第二十九放大调理电阻R29的另一端与第二光耦合器U3的信号输出正极VOUT+连接；
第三十一放大调理电阻R31的另一端与第二运算放大器的同相输入端连接。
参见图1，本实施例的电机控制器绝缘监测电路还包括电源转换器；
电压转换器包括：电源转换芯片U4，第十二滤波电容C12，第十三滤波电容C13，第十四滤波电容C14以及第十五滤波电容C15；
电源转换芯片的输入端(管脚1)与电源，第十二滤波电容C12的一端以及第十三滤波电容C13的一端连接；
第十二滤波电容C12的另一端与第十三滤波电容C13的另一端共接后接地；
电源转换芯片U4的输出端(管脚1)与第一光耦合器U1的输入端电源供电端VDD1连接；
电源转换芯片的输出端(管脚1)还与第十四滤波电容的一端，第十五滤波电容的一端连接；
第十四滤波电容C14的另一端与第十五滤波电容C15的另一端共接后接地。
此外，电源转换芯片U4的输出端与第二光耦合器U3的输入端电源供电端VDD1连接。
图1所示的电路，第一电压采样电路，输入光耦U1的电压为：
Vin1＝Vbus/[(R2+R3+R4+R5+R6+R7+R11)*R11]，这里的*表示相乘。
经过第一运算放大器放大K1倍后，输出到电机控制器MCU的AD口采样口电压为
Vad1＝Vin*K1；
第二电压采样电路，输入光耦U3的电压为：
Figure PCTCN2019077979-appb-000001
其中，R14+…R26表示的是：
R14+R15+R16+R17+R18+R19+R20+R21+R22+R23+R24+R25+R26。
经过第二运算放大器放大K2倍后，输出到电机控制器MCU的AD采样口电压为
Vad2＝Vin2*K2
因此，当在高压正母线或高压负母线上并联一个较小的阻抗Rx后，第二电压采样电路的电压采样值计算如下：
光耦U3的输入电压
Figure PCTCN2019077979-appb-000002
其中，R14+…R20表示的是：R14+R15+R16+R17+R18+R19+R20。
R21+…R26表示的是：R21+R22+R23+R24+R25+R26。
再经过运算放大器放大K2倍后，输出到电机控制器MCU的AD采样口电压为Vad3＝Vin3*K2。
此时，根据采得的电压值Vad3推导出的母线电压Vbus3一定大于第一电压采样电路推导出的Vbus1，由此，可判定电机控制器绝缘故障。
本实施例中第一电压采样电路为高压母线电压采样电路，是直接在母线电压上串接电阻分压采样。当母线正或负对地出现短路时，电路上的电阻即被短接，所以采样端电压会改变，而对比第一路母线电压时，即可判断母线正负对地绝缘不满足要求，而发生了绝缘故障。
综上所述，本实施例的电机控制器绝缘监测电路结构简单，实用性强，成本低。方便大规模推广应用。并且能监测电机控制器绝缘故障保证电机控制器以及整车的安全。
以上所述，仅为本发明的具体实施方式，在本发明的上述教导下，本领域技术人员可以在上述实施例的基础上进行其他的改进或变形。本领域技术人员应该明白，上述的具体描述只是更好的解释本发明的目的，本发明的保护范围以权利要求的保护范围为准。

Claims (7)

  1. 一种电机控制器绝缘监测电路，其特征在于，包括：第一电压采样电路和第二电压采样电路；
    第一电压采样电路与母线输入正极，母线输入负极以及母线电压采样信号线连接，所述母线电压采样信号连接至电机控制器；
    第二电压采样电路与母线输入正极，母线输入负极以及绝缘电压采样信号线连接，所述绝缘电压采样信号连接至电机控制器；
    所述电机控制器，比较第一电压采样电路采集的母线电压值与第二电压采样电路采集的绝缘电压值，当母线电压值与绝缘电压值不一致时，则发出绝缘监测报警信号。
  2. 根据权利要求1所述的电机控制器绝缘监测电路，其特征在于，所述第一电压采样电路包括：第一光耦合器，第一运算放大器以及依次串联的第二采样电阻，第三采样电阻，第四采样电阻，第五采样电阻，第六采样电阻，第七采样电阻，第八采样电阻；
    所述第二采样电阻的一端与母线输入正极连接；
    所述第八采样电阻的一端串联一第十一采样电阻后与母线输入负极连接；
    所述第八采样电阻的另一端与所述第一光耦合器的信号输入端连接，
    所述第一光耦合器的信号输出负极与所述第一运算放大器的反相输入端连接，
    所述第一光耦合器的信号输出正极与所述第一运算放大器的同相输入端连接，
    所述第一运算放大器的输出端与母线电压采样信号线连接。
  3. 根据权利要求2所述的电机控制器绝缘监测电路，其特征在于，所述第一电压采样电路还包括：滤波电容和放大调理电阻；
    所述滤波电容包括第一滤波电容，第二滤波电容，第三滤波电容，第四滤波电容，第五滤波电容和第六滤波电容；
    所述放大调理电阻包括：第一放大调理电阻，第九放大调理电阻，第十放大调理电阻和第十二放大调理电阻；
    所述第一滤波电容的一端与所述母线电压采样信号线以及所述第一放大调理电阻的一端连接；
    所述第一滤波电容的另一端与所述第一放大调理电阻的另一端连接后与所述第九放大调理电阻的一端连接，所述第九放大调理电阻的一端还与所述第一运算放大器的反相输入端连接；
    所述第九放大调理电阻的另一端与所述第一光耦合器的信号输出负极连接；
    所述第二滤波电容的一端与所述第一光耦合器的输出电源供电端连接；
    所述第二滤波电容的另一端接地；
    所述第三滤波电容的一端与所述第一光耦合器的输入电源供电端连接；
    所述第三滤波电容的另一端与所述第四滤波电容的另一端连接后接地；
    所述第四滤波电容的一端与所述第一光耦合器的信号输入端连接；
    所述第五滤波电容的一端与所述第十放大调理电阻的一端以及所述第一运算放大器的同相输入端连接；
    所述第五滤波电容的另一端与所述第十二放大调理电阻的一端连接后接地；
    所述第十放大调理电阻的另一端与所述第一光耦合器的信号输出正极连接；
    所述第十二放大调理电阻的另一端与所述第一运算放大器的同相输入端连接；
    所述第六滤波电容的一端与所述第一运算放大器的电源供电端连接，所述第六滤波电容的另一端接地。
  4. 根据权利要求1所述的电机控制器绝缘监测电路，其特征在于，所述第二电压采样电路包括：第二光耦合器，第二运算放大器以及依次串联的第十四采样电阻，第十五采样电阻，第十六采样电阻，第十七采样电阻，第十八采样电阻，第十九采样电阻，第二十采样电阻，第二十一采样电阻，第二十二采样电阻，第二十三采样电阻，第二十四采样电阻，第二十五采样电阻，第二十六采样电阻和第二十七采样电阻；
    所述第十四采样电阻的一端与母线输入正极连接；
    所述第二十采样电阻的一端与第二十一采样电阻的一端共接后接地，
    所述第二十七采样电阻的一端串联一第三十采样电阻后与母线输入负极连接；
    所述第二十七采样电阻的另一端与所述第二光耦合器的信号输入端连接，
    所述第二光耦合器的信号输出负极与所述第二运算放大器的反相输入端连接，
    所述第二光耦合器的信号输出正极与所述第二运算放大器的同相输入端连接，
    所述第二运算放大器的输出端与绝缘电压采样信号线连接。
  5. 根据权利要求4所述的电机控制器绝缘监测电路，其特征在于，所述第二电压采样电路还包括：第七滤波电容，第八滤波电容，第九滤波电容，第十滤波电容，第十一滤波电容，第十三放大调理电阻，第二十八放大调理电阻，第二十九放大调理电阻以及第三十一放大调理电阻；
    所述第七滤波电容的一端与所述第十三放大调理电阻的一端以及所述绝缘电压采样信号线连接；
    所述第七滤波电容的另一端与所述第十三放大调理电阻的另一端连接后与所述第二十八放大调理电阻的一端连接，所述第二十八放大调理电阻的一端还与所述第二运算放大器的反相输入端连接；
    所述第二十八放大调理电阻的另一端与所述第二光耦合器的信号输出负极连接；
    所述第八滤波电容的一端与所述第二光耦合器的输出电源供电端连接；
    所述第八滤波电容的另一端接地；
    所述第九滤波电容的一端与所述第二光耦合器的输入电源供电端连接；
    所述第九滤波电容的另一端与所述第十滤波电容的另一端连接后接地；
    所述第十滤波电容的一端与所述第二十七采样电阻的另一端以及所述第二光耦合器的信号输入端连接；
    所述第十一滤波电容的一端与所述第二十九放大调理电阻的一端以及所述第二运算放大器的同相输入端连接；
    所述第十一滤波电容的另一端与所述第三十一放大调理电阻的一端连接后接地；
    所述第二十九放大调理电阻的另一端与所述第二光耦合器的信号输出正极连接；
    所述第三十一放大调理电阻的另一端与所述第二运算放大器的同相输入端连接。
  6. 根据权利要求2所述的电机控制器绝缘监测电路，其特征在于，还包括电源转换器；
    电压转换器包括：电源转换芯片，第十二滤波电容，第十三滤波电容，第十四滤波电容以及第十五滤波电容；
    所述电源转换芯片的输入端与电源，第十二滤波电容的一端以及第十三滤波电容的一端连接；
    第十二滤波电容的另一端与第十三滤波电容的另一端共接后接地；
    所述电源转换芯片的输出端与所述第一光耦合器的输入端电源供电端连接；
    所述电源转换芯片的输出端还与所述第十四滤波电容的一端，所述第十五滤波电容的一端连接；
    所述第十四滤波电容的另一端与所述第十五滤波电容的另一端共接后接地。
  7. 根据权利要求4所述的电机控制器绝缘监测电路，其特征在于，还包括电源转换器；
    电压转换器包括：电源转换芯片，第十二滤波电容，第十三滤波电容，第十四滤波电容以及第十五滤波电容；
    所述电源转换芯片的输入端与电源，第十二滤波电容的一端以及第十三滤波电容的一端连接；
    第十二滤波电容的另一端与第十三滤波电容的另一端共接后接地；
    所述电源转换芯片的输出端与所述第二光耦合器的输入端电源供电端连接；
    所述电源转换芯片的输出端还与所述第十四滤波电容的一端，所述第十五滤波电容的一端连接；
    所述第十四滤波电容的另一端与所述第十五滤波电容的另一端共接后接地。
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