CN108051642A - High voltage dc bus insulation resistance detection device and detection method - Google Patents

High voltage dc bus insulation resistance detection device and detection method Download PDF

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Publication number
CN108051642A
CN108051642A CN201711215194.7A CN201711215194A CN108051642A CN 108051642 A CN108051642 A CN 108051642A CN 201711215194 A CN201711215194 A CN 201711215194A CN 108051642 A CN108051642 A CN 108051642A
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resistance
voltage
circuit
connection
microprocessor
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CN108051642B (en
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张亮
董建
侯学会
吴鹏
刘国亮
杜庆洋
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Hefei Test Test Ltd By Share Ltd
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Hefei Test Test Ltd By Share Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters

Abstract

The invention discloses high voltage dc bus insulation resistance detection device, including microprocessor, busbar voltage sample circuit, driving voltage sample circuit, control power supply, power positive cathode switching circuit, excitation power supply conversion circuit, divider resistance voltage sampling circuit;Control power supply connection microprocessor, busbar voltage sample circuit, driving voltage sample circuit and divider resistance voltage sampling circuit are all connected with microprocessor, microprocessor connects excitation power supply conversion circuit, excitation power supply conversion circuit connects the sample circuit of insulation resistance, microprocessor connects power positive cathode switching circuit, power positive cathode switching circuit connects divider resistance voltage sampling circuit, microprocessor connection CAN communication.The present invention calculates insulation resistance of the high voltage bus positive or negative pole to housing by the generation of driving voltage, the switching of relay, and then judges whether busbar declines the insulation resistance of shell, so as to eliminate the too low security risk brought of high voltage bus insulation resistance.

Description

High voltage dc bus insulation resistance detection device and detection method
Technical field
The invention belongs to D.C. isolation resistance detection, high voltage supply, safety utilization of electric power fields, and it is female to be related to a kind of high voltage direct current Line insulation resistance detection device and detection method.
Background technology
The insulation resistance detection mode of low-voltage power supply system is more at present, mostly in the case of no busbar voltage into Row detection, and traditional detection insulation resistance has all used current transformer, volume is larger;To solve high direct voltage power supply and distribution system Busbar of uniting declines housing insulation resistance, threatens human-body safety, it is also possible to cable be caused to burn or even generate a system such as fire The problem of row, the present invention are detected the insulation resistance of system, and advanced warning can be realized when insulation resistance is less than normal, improve Electrical safety.A series of threats that operating personnel generate are eliminated, and the present invention does not use sensor measurement electric current to calculate absolutely Edge resistance reduces the volume of insulation resistance detecting system.
The content of the invention
It is an object of the invention to provide a kind of high voltage dc bus insulation resistance detection device and detection methods, pass through The generation of driving voltage, the switching of relay calculate insulation resistance of the high voltage bus positive or negative pole to housing, and then judge Whether busbar declines the insulation resistance of shell, so as to eliminate the too low security risk brought of high voltage bus insulation resistance.
The purpose of the present invention can be achieved through the following technical solutions:
High voltage dc bus insulation resistance detection device, including including microprocessor, busbar voltage sample circuit, excitation Voltage sampling circuit, control power supply, power positive cathode switching circuit, excitation power supply conversion circuit, divider resistance voltage sample electricity Road;
The control power supply connection microprocessor, is microprocessor power supply by controlling power supply;
The busbar voltage sample circuit, driving voltage sample circuit and divider resistance voltage sampling circuit are all connected with micro- Processor sends the sampling of instruction progress busbar voltage, driving voltage and insulation resistance by microprocessor;
The microprocessor connects excitation power supply conversion circuit, and excitation power supply conversion circuit connects the sampling of insulation resistance Circuit, microprocessor controls DC24V to switch to DC200V excitation power supplies by excitation power supply conversion circuit, and excitation power supply is become Swap-in row controls, and transformed DC200V excitation power supplies are powered for divider resistance voltage sampling circuit;
The microprocessor connects power positive cathode switching circuit, power positive cathode switching circuit connection divider resistance electricity Sample circuit is pressed, by power supply control microprocessor positive and negative anodes switching circuit, realizes biswitch in power positive cathode switching circuit The selection access of power source for relay control positive and negative electrode meets the testing requirements of divider resistance R0 under different conditions;Microprocessor simultaneously Device connects CAN communication.
Further, the divider resistance voltage sampling circuit includes the power supply of 200V, and the power supply of 200V is The DC200V excitation power supplies that excitation power supply conversion circuit control DC24V is transformed, the power supply of 200V are connected by diode Connect 7 series resistances, one end connection isolation amplifier of one end connection the divider resistance R15, divider resistance R15 of 7 series resistances 2 pins of chip E1, other end connecting test access point, 1 pin of isolation amplifier chip E1 is tested by capacitance connection to be accessed Point, test access point connection power positive cathode control switching circuit, while 3 pins and 4 of end connection isolation amplifier chip E1 Pin, the both ends of divider resistance R15 are parallel with diode and two capacitances, the 8 pin connection+5V electricity of isolation amplifier chip E1 Source is powered by+5V power supplys for isolation amplifier chip E1, and 7 pins of isolation amplifier chip E1 pass through resistance R10 concatenation operations 3 pins of amplifier N1A, 6 pins of isolation amplifier chip E1 pass through 2 pins of resistance R12 concatenation operation amplifiers N1A, fortune 1 end of output for calculating amplifier N1A passes through resistance R11 connection microprocessor AD thief hatch.
Further, the excitation power supply conversion circuit includes+24V power supplys, and+24V power supplys connect 1 pin of inductance L1, 2 pins of inductance L1 connect 2 pins of DC-DC power module U1 by capacitance C4 in parallel with electrolytic capacitor C10, solve capacitance 1 pin of the other end connection power module U1 of C10, one end of the 5 pins connection electrolytic capacitor C1 of power module U1,3 pins The other end of electrolytic capacitor C1 is connected, the both ends of electrolytic capacitor C1 are parallel with capacitance C2, and one end ground connection of capacitance C2, one end connects 200V power supplys are connect, the both ends of capacitance C2 are parallel with capacitance C3, resistance R2 and diode, the 6 pins connection thermocouple of power module U1 4 pins of E1,1 pin of thermocouple E1 are that thermocouple E1 powers by+5V power supplys by resistance R1 connection+5V power supplys, thermocouple E1 1 pin connection microprocessor.
The power positive cathode switching circuit includes thermocouple E3, the 2 pins connection microprocessor of thermocouple E3, and 3 pins pass through Resistance in parallel and the base stage of capacitance connection triode, the grounded collector of triode, the emitter connection relay of triode 2 pins, 4 pins of thermocouple E3 connect 1 pin of relay by resistance, and 3 pins of relay pass through three series resistances Ground connection, 4 pin connecting test access points of relay, test access point connection divider resistance voltage sampling circuit.
High voltage dc bus insulation resistance detection method, specific detection method are as follows:
S1:The voltage U that microprocessor acquisition passes through divider resistance voltage sampling circuit divider resistance R0 both ends1ROAnd U2RO, And driving voltage value is gathered by driving voltage sample circuit, while microprocessor is gathered by busbar voltage sample circuit Busbar voltage V is female;
S2:The voltage U that microprocessor will collect1ROAnd U2RO, the female input high pressure of driving voltage value and busbar voltage V it is female Line cathode calculates formula to the insulation resistance of housing
In or high voltage bus anode formula is calculated to the insulation resistance of housing
In counted It calculates, and then obtains the resistance value of insulation resistance Rb and Rc;
S3:Microprocessor by the resistance value of counted insulation resistance Rb and Rc compared with setting value, it is exhausted when what is calculated It when edge resistance value is less than setting value, is reported by CAN bus, while operation is reminded into line flicker by alarm indicator Personnel are handled.
Beneficial effects of the present invention:
The present invention circuit theory is simple, component is few, can be transplanted in the various equipment for needing to monitor insulation resistance;
The applicable electric power system scope of the present invention is wide, can be applied to from tens volts of power supply system to several kilovolts of confession Electric system.
The present invention is safe, reduces the accident to cause casualties because insulation resistance is too low.
The detection pattern of the present invention is various, can detect the uncharged situation of busbar incessantly, can also detect the charged feelings of busbar Condition.
The strong antijamming capability of the present invention, also can be accurate in bounce even if busbar voltage by being sampled to busbar voltage True calculates to obtain insulation resistance resistance value.
The resistance to shock of the present invention is strong, the series resistance in switching circuit, prevents in slightly vibratory impulse environment is disliked, after Electric appliance instantaneous short-circuit burns out relay, ensures safety.
Description of the drawings
In order to facilitate the understanding of those skilled in the art, the present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is high voltage dc bus insulation resistance detection device structure diagram of the present invention;
Fig. 2 is divider resistance voltage sampling circuit of the present invention;
Fig. 3 is busbar voltage sample circuit of the present invention;
Fig. 4 is driving voltage sample circuit of the present invention;
Fig. 5 is excitation power supply conversion circuit of the present invention;
Fig. 6 is power positive cathode switching circuit of the present invention;
Fig. 7 is power positive cathode switching circuit of the present invention;
Fig. 8 is power sense circuit of the present invention;
Fig. 9 is the first power cathode detection circuit of the invention;
Figure 10 is second source cathode detection circuit of the present invention;
Figure 11 is the first positive pole detection circuit of the invention;
Figure 12 is second source anode detection circuit of the present invention;
Figure 13 is the first positive pole detection circuit detection process schematic diagram of the invention;
Figure 14 is the first power cathode detection circuit detection process schematic diagram of the invention;
Figure 15 is second source cathode detection circuit detection process schematic diagram of the present invention;
Figure 16 is second source cathode detection circuit detection process schematic diagram of the present invention.
Specific embodiment
High voltage dc bus insulation resistance detection device, as shown in Figure 1, including being sampled including microprocessor, busbar voltage Circuit, driving voltage sample circuit, control power supply, power positive cathode switching circuit, excitation power supply conversion circuit, divider resistance Voltage sampling circuit;
The control power supply connection microprocessor, is microprocessor power supply by controlling power supply;Busbar voltage sampling electricity Road, driving voltage sample circuit and divider resistance voltage sampling circuit are all connected with microprocessor, are sent and instructed by microprocessor Carry out the sampling of busbar voltage, driving voltage and insulation resistance;Microprocessor connects excitation power supply conversion circuit, excitation power supply Conversion circuit connects the sample circuit of insulation resistance, and microprocessor controls DC24V to switch to by excitation power supply conversion circuit DC200V excitation power supplies, and excitation power supply conversion is controlled, transformed DC200V excitation power supplies are divider resistance voltage Sample circuit is powered;Microprocessor connects power positive cathode switching circuit, power positive cathode switching circuit connection divider resistance electricity Sample circuit is pressed, by power supply control microprocessor positive and negative anodes switching circuit, realizes biswitch in power positive cathode switching circuit The selection access of power source for relay control positive and negative electrode meets the testing requirements of divider resistance R0 under different conditions;Microprocessor simultaneously Device connects CAN communication;
As shown in Fig. 2, the divider resistance voltage sampling circuit includes the power supply of 200V, the power supply of 200V For the DC200V excitation power supplies that excitation power supply conversion circuit control DC24V is transformed, the power supply of 200V passes through diode Connect 7 series resistances, one end connection the divider resistance R15, the voltage, that is, U at divider resistance R15 both ends of 7 series resistances1RO And U2RO, 2 pins of one end connection isolation amplifier chip E1 of divider resistance R15, other end connecting test access point, isolation fortune 1 pin of chip E1 is put by capacitance connection test access point, test access point connects power positive cathode control switching circuit, 3 pins and 4 pins of end connection isolation amplifier chip E1 simultaneously, the both ends of divider resistance R15 are parallel with diode and two Capacitance, the 8 pin connection+5V power supplys of isolation amplifier chip E1 are powered by+5V power supplys for isolation amplifier chip E1, isolation 1 pin of amplifier chip E1 is passed through by two capacitance connection test access points in parallel, 7 pins of isolation amplifier chip E1 3 pins of resistance R10 concatenation operation amplifiers N1A, 6 pins of isolation amplifier chip E1 are amplified by resistance R12 concatenation operations 2 pins of device N1A, 1 end of output of operational amplifier N1A pass through resistance R11 connection microprocessor AD thief hatch;Pass through partial pressure The voltage that resistance R15 divides is U1ROOr U2RO, signal is amplified by isolation amplifier chip E1, send to Chip Microcomputer A/D and adopts Sample mouth, is sampled by Chip Microcomputer A/D, and microcontroller after computing compared with setting value by judging, it is determined whether alarm;
As shown in figure 3, the busbar voltage sample circuit includes DC900V busbar power supplys, DC900V busbares power supply connection 6 A series resistance, two series resistances connect divider resistance R27, one end connection isolation amplifier chip E2's of divider resistance R27 2 pins, 3 pins and 4 pins of other end connection isolation amplifier chip E2, while the other end is grounded, the two of divider resistance R27 End is parallel with diode and two capacitances, and 6 pins of isolation amplifier chip E2 and 7 pins distinguish concatenation operation amplifier N1B's Out-phase end and in-phase end, the output terminal of operational amplifier N1B connect microprocessor AD thief hatch by resistance;Busbar voltage is adopted Sample circuit is used to judge whether live detection;
As shown in figure 4, the driving voltage sample circuit includes DC200V excitation power supplies, DC200V excitation power supplies pass through Two series resistances connect divider resistance R43, and 2 pins of one end connection isolation amplifier chip E3 of divider resistance R43 are another 3 pins and 4 pins of end connection isolation amplifier chip E3, while the other end is grounded, the both ends of divider resistance R43 are parallel with two A capacitance, the out-phase end and in-phase end of 6 pins of isolation amplifier chip E3 and 7 pins difference concatenation operation amplifier N2A, fortune The output terminal for calculating amplifier N2A connects microprocessor AD thief hatch by resistance;Excitation power supply DC200V voltage samples, are used for It reduces excitation power supply variation and causes detection error;
As shown in figure 5, the excitation power supply conversion circuit includes+24V power supplys, the 1 of+24V power supplys connection inductance L1 draws Foot, 2 pins of inductance L1 connect 2 pins of DC-DC power module U1, solution electricity by capacitance C4 in parallel with electrolytic capacitor C10 Hold 1 pin of the other end connection power module U1 of C10, one end of the 5 pins connection electrolytic capacitor C1 of power module U1,3 draw The other end of foot connection electrolytic capacitor C1, the both ends of electrolytic capacitor C1 are parallel with capacitance C2, one end ground connection of capacitance C2, one end 200V power supplys are connected, the both ends of capacitance C2 are parallel with capacitance C3, resistance R2 and diode, the 6 pins connection electricity of power module U1 4 pins of coupling E1,1 pin of thermocouple E1 are that thermocouple E1 powers by+5V power supplys by resistance R1 connection+5V power supplys, thermocouple The 1 pin connection microprocessor of E1;Power circuit is connected to the both ends of capacitance C2, and control signal is sent by microprocessor, control The 6 pins output low level of power module U1 processed, power module U1 are stopped, and+24 supply voltage output 0V voltages are used Circuit is directly powered by 200V power supplys;During the 6 pins output high level of power supply control microprocessor module U1 ,+24 electricity Source voltage is converted into 200 voltages by power module U1, as shown in figure 15, the voltage string provided with the 200V power supplys in circuit After connection, total voltage 0V, power circuit input voltage is 0V, as shown in figure 16;
As shown in Figure 6 and Figure 7, the power positive cathode switching circuit includes thermocouple E3, and the 2 pins connection of thermocouple E3 is micro- Processor, 3 pins are by the base stage of in parallel resistance and capacitance connection triode, the grounded collector of triode, triode Emitter connects 2 pins of relay, and 4 pins of thermocouple E3 connect 1 pin of relay, 3 pins of relay by resistance It is grounded by three series resistances, 4 pin connecting test access points of relay, test access point connection divider resistance voltage Sample circuit;
High voltage dc bus insulation resistance detection method, is as follows:
S1:The voltage U that microprocessor acquisition passes through divider resistance voltage sampling circuit divider resistance R0 both ends1ROAnd U2RO, And driving voltage value is gathered by driving voltage sample circuit, while microprocessor is gathered by busbar voltage sample circuit Busbar voltage V is female;
S2:The voltage U that microprocessor will collect1ROAnd U2RO, the female input high pressure of driving voltage value and busbar voltage V it is female Line cathode calculates formula to the insulation resistance of housing
In or high voltage bus anode formula is calculated to the insulation resistance of housing
In counted It calculates, and then obtains the resistance value of insulation resistance Rb and Rc;
S3:Microprocessor by the resistance value of counted insulation resistance Rb and Rc compared with setting value, it is exhausted when what is calculated It when edge resistance value is less than setting value, is reported by CAN bus, while operation is reminded into line flicker by alarm indicator Personnel are handled.
By taking DC900V electrical systems as an example, the high voltage bus cathode to the insulation resistance Rc or high voltage bus of housing just Extremely the calculation formula of the insulation resistance Rb of housing is obtained by power sense circuit;
As shown in figure 8, the power sense circuit includes DC900V busbares power supply, DC200V controlled stimulus power supply, sampling Divider resistance R0, measuring phases minimum moment insulation resistance Ra, Ra > > R0, electrical system cathode to housing insulation resistance Rb, Electrical system anode is the anti-reverse diode V1 of excitation power supply, the DC200V power supplys connect two poles to housing insulation resistance Rc Pipe V1 anodes, one end of diode V1 cathode connection resistance R1, the other end series resistance R0 of resistance Ra, one end of resistance R0 The A ends of relay, the cathode of the B ends connection DC900V busbar power supplys of relay are connected, the C-terminal of relay is connected by resistance Rb Connect the anode of DC900V busbar power supplys, while one end connection housing of resistance Rb;
As shown in Figure 9 and Figure 10, when the A ends of the relay of power sense circuit are connected to B ends, power sense circuit shape Into power cathode detection circuit, the power cathode detection circuit is born by the first power cathode detection circuit and second source Detection circuit two kinds of circuit forms in pole are detected, in second source cathode detection circuit, by the relay of power sense circuit A ends be connected to B ends, DC200V power supplys, resistance R0, resistance Ra and resistance Rb composition series loops form the first power cathode Detection circuit, DC900V busbar power supplys, which are directly grounded, is not attached to circuit when in circuit;The second source cathode detection circuit In, DC24V power supplys will be connected between the B ends of the relay of power sense circuit and C-terminal, and the A ends of relay are connected to B End, the B ends of the cathode connection relay of DC24V power supplys, resistance Rb and resistance Rc form parallel circuit, form second source and bear Pole detection circuit;
As is illustrated by figs. 11 and 12, when the A ends of the relay of power sense circuit are connected to B ends, power sense circuit shape Into positive pole detection circuit, the positive pole detection circuit by the first positive pole detection circuit and second source just Detection circuit two kinds of circuit forms in pole are detected, in the first positive pole detection circuit, by power sense circuit after The A ends of electric appliance are connected to C-terminal, and DC200V power supplys, resistance R0, resistance Ra, DC900V busbar power supply and resistance Rc compositions are connected back Road, forms the first positive pole detection circuit, and resistance Rb is not attached to circuit;It, will in the second source anode detection circuit DC24V power supplys are connected between the B ends of the relay of power sense circuit and C-terminal, and the A ends of relay are connected to C-terminal, The C-terminal of the cathode connection relay of DC24V power supplys, resistance Rb and resistance Rc form parallel circuit, form second source anode Detection circuit;
(1) by the first positive pole detection circuit and the first power cathode detection circuit to high voltage bus anode or negative Extremely to the determination of insulation resistance of housing, as shown in Figure 13 and Figure 14, specific assay method is:
First positive pole detection circuit measures:When the A ends of relay are connected to C by power positive cathode control circuit During end, power sense circuit forms the first positive pole detection circuit, and DC200V power supplys, resistance R0, resistance Ra, DC900V are female Line power supply and resistance Rc composition series loops, the electric current in the circuit is Ia;
It can be calculated:Rc=(200/Ia)-R1;
First power cathode detection circuit measures:When the A ends of relay are connected to B by power positive cathode control circuit During end, power sense circuit composition power cathode detection circuit, DC200V power supplys, resistance R0, resistance Ra and resistance Rb composition strings Join circuit, the electric current in the circuit is Ib;
It can be calculated:Rb=(200/Ib)-R1;
(2) high voltage bus positive or negative pole carries out the insulation resistance of housing by second source cathode detection circuit It measures, as shown in Figure 15 and Figure 16, specific assay method is:
It will be connected between the DC200V power supplys of second source cathode detection circuit and resistance Rb and one end in parallel of resistance Rc The anode of afterflow diode V2, diode V2 connect one end and the ground connection of resistance Rb and resistance Rc, the cathode of diode V2 respectively DC200V power supplys are connected, controllable electric power in parallel between the positive and negative anodes of diode V2;
When output voltage control is 200V after DC200V controlled stimulus power supply is controlled by encouraging conversion circuit, flow through The electric current of resistance Ra is I1, and the voltage at resistance R0 both ends is U1RO, the voltage at resistance Rb both ends is U1;
U1R0=I1*R0
I1* Ra=DC200V+U1
It arranges:
When output voltage control is 0V after DC200V controlled stimulus power supply is controlled by encouraging conversion circuit, electricity is flowed through The electric current of Ra is hindered for I2, and the voltage at resistance R0 both ends is U2RO, the voltage at resistance Rb both ends is U2;
I2*Ra=U2
It arranges:
The parallel resistance RM of insulation resistance Rb and Rc, busbar voltage VIt is female
1. formula subtracts 2. formula, draw:
1. formula adds 2. formula, draw:
It can be obtained by abbreviation:
By 3. formula and 4. formula, Rb, Rc are drawn;
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment All details are described to the greatest extent, are not limited the invention to the specific embodiments described.Obviously, according in this specification Hold, can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is in order to preferably explain this The principle and practical application of invention, so that skilled artisan can be best understood by and utilize the present invention.This hair It is bright to be limited only by the claims and their full scope and equivalents.

Claims (5)

1. high voltage dc bus insulation resistance detection device, which is characterized in that including including microprocessor, busbar voltage sampling electricity Road, driving voltage sample circuit, control power supply, power positive cathode switching circuit, excitation power supply conversion circuit, divider resistance voltage Sample circuit;
The control power supply connection microprocessor, is microprocessor power supply by controlling power supply;
The busbar voltage sample circuit, driving voltage sample circuit and divider resistance voltage sampling circuit are all connected with microprocessor Device sends the sampling of instruction progress busbar voltage, driving voltage and insulation resistance by microprocessor;
The microprocessor connects excitation power supply conversion circuit, and excitation power supply conversion circuit connects the sample circuit of insulation resistance, Microprocessor controls DC24V to switch to DC200V excitation power supplies by excitation power supply conversion circuit, and excitation power supply is converted and is carried out Control, transformed DC200V excitation power supplies are powered for divider resistance voltage sampling circuit;
The microprocessor connects power positive cathode switching circuit, power positive cathode switching circuit connection divider resistance voltage sample Circuit by power supply control microprocessor positive and negative anodes switching circuit, realizes biswitch relay in power positive cathode switching circuit The selection access of power supply positive and negative electrode is controlled, meets the testing requirements of divider resistance R0 under different conditions;Microprocessor connection simultaneously CAN communication.
2. high voltage dc bus insulation resistance detection device according to claim 1, which is characterized in that the divider resistance Voltage sampling circuit includes the power supply of 200V, and the power supply of 200V controls DC24V conversions for excitation power supply conversion circuit The DC200V excitation power supplies formed, the power supply of 200V connect 7 series resistances by diode, and the one of 7 series resistances 2 pins of one end connection isolation amplifier chip E1 of end connection divider resistance R15, divider resistance R15, other end connecting test connect Access point, 1 pin of isolation amplifier chip E1 pass through capacitance connection test access point, test access point connection power positive cathode switching Control circuit, while 3 pins and 4 pins of end connection isolation amplifier chip E1, the both ends of divider resistance R15 are parallel with two poles Pipe and two capacitances, the 8 pin connection+5V power supplys of isolation amplifier chip E1 are supplied by+5V power supplys for isolation amplifier chip E1 Electricity, 7 pins of isolation amplifier chip E1 are by 3 pins of resistance R10 concatenation operation amplifiers N1A, and the 6 of isolation amplifier chip E1 By 2 pins of resistance R12 concatenation operation amplifiers N1A, 1 end of output of operational amplifier N1A is connected pin by resistance R11 Microprocessor AD thief hatch.
3. high voltage dc bus insulation resistance detection device according to claim 1, which is characterized in that the excitation power supply Conversion circuit includes+24V power supplys, 1 pin of+24V power supplys connection inductance L1, and 2 pins of inductance L1 pass through capacitance C4 in parallel 2 pins of DC-DC power module U1 are connected with electrolytic capacitor C10, the 1 of the other end connection power module U1 of solution capacitance C10 draws Foot, one end of the 5 pins connection electrolytic capacitor C1 of power module U1, the other end of 3 pins connection electrolytic capacitor C1, electrolytic capacitor The both ends of C1 are parallel with capacitance C2, and one end ground connection of capacitance C2, one end connection 200V power supplys, the both ends of capacitance C2 are parallel with capacitance C3, resistance R2 and diode, 4 pins of the 6 pins connection thermocouple E1 of power module U1,1 pin of thermocouple E1 pass through resistance R1 Connection+5V power supplys are powered by+5V power supplys for thermocouple E1, the 1 pin connection microprocessor of thermocouple E1.
4. high voltage dc bus insulation resistance detection device according to claim 1, which is characterized in that the power supply is positive and negative Pole switching circuit includes thermocouple E3, the 2 pins connection microprocessor of thermocouple E3, and 3 pins pass through resistance and capacitance connection in parallel The base stage of triode, the grounded collector of triode, 2 pins of the emitter connection relay of triode, 4 pins of thermocouple E3 1 pin of relay is connected by resistance, 3 pins of relay are grounded by three series resistances, the 4 pins connection of relay Test access point, test access point connection divider resistance voltage sampling circuit.
5. high voltage dc bus insulation resistance detection method according to claim 1, which is characterized in that specific detection method It is as follows:
S1:The voltage U that microprocessor acquisition passes through divider resistance voltage sampling circuit divider resistance R0 both ends1ROAnd U2RO, and Driving voltage value is gathered by driving voltage sample circuit, while microprocessor gathers busbar electricity by busbar voltage sample circuit Press V female;
S2:The voltage U that microprocessor will collect1ROAnd U2RO, the female input high voltage bus cathode of driving voltage value and busbar voltage V Formula is calculated to the insulation resistance of housing
In or high voltage bus anode formula is calculated to the insulation resistance of housing
In counted It calculates, and then obtains the resistance value of insulation resistance Rb and Rc;
S3:Microprocessor by the resistance value of counted insulation resistance Rb and Rc compared with setting value, when the insulated electro calculated It when resistance value is less than setting value, is reported by CAN bus, while operating personnel is reminded into line flicker by alarm indicator Processing.
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Publication number Priority date Publication date Assignee Title
CN109116122A (en) * 2018-06-27 2019-01-01 上海巴玛克电气技术有限公司 The method that non-isolated output inverter realizes insulation against ground resistance detection
CN110927462A (en) * 2019-12-13 2020-03-27 中国北方车辆研究所 Electric vehicle voltage injection type insulation resistance real-time detection circuit
CN110927462B (en) * 2019-12-13 2021-11-09 中国北方车辆研究所 Electric vehicle voltage injection type insulation resistance real-time detection circuit

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