CN107219402A - A kind of circuit for quick measurement of DC resistance for power module port - Google Patents
A kind of circuit for quick measurement of DC resistance for power module port Download PDFInfo
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- CN107219402A CN107219402A CN201710423614.4A CN201710423614A CN107219402A CN 107219402 A CN107219402 A CN 107219402A CN 201710423614 A CN201710423614 A CN 201710423614A CN 107219402 A CN107219402 A CN 107219402A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/002—Switches for altering the measuring range or for multitesters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
-
- 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
- G01R31/40—Testing power supplies
-
- 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
-
- 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
- G05B19/0423—Input/output
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2604—Test of external equipment
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to a kind of circuit for quick measurement of DC resistance for power module port, including feedback regulating circuit, range switching matrix circuit and voltage and current detection circuit；The input of the feedback regulating circuit terminates a bias voltage, output end is connected with the input of range switching matrix circuit, range switching matrix circuit is used to connect voltage and current detection circuit and measured device port, voltage and current detection circuit is also connected with measured device port, the voltage and current detection circuit is connected with external microcontroller, and bias voltage is exported by microprocessor control DAC1.The present invention is a kind of simple and practical circuit, applied to fast-speed direct current resistance measurement, to the measurement fast and stable of various capacitance-resistance parallel connection direct resistance, time of measuring is hardly influenceed by the resistance capacitance of measurand, adjustable bias can anti-output overvoltage, the multrirange structure connected using measuring resistance, can be measured than large range of D.C. resistance, the degree of accuracy is high.
Description
Technical field
Patent of the present invention is related to a kind of circuit for quick measurement of DC resistance for power module port.
Background technology
The concept of D.C. resistance is widely present in electronic information field, and power module port D.C. resistance is reflection power supply mould
The important parameter of block performance, including the forward and reverse D.C. resistance of input/output port, S ends D.C. resistance etc., these parameters are all sentenced
The important evidence of deenergizing performance.Because there is Large Copacity shunt capacitance and filter capacitor in power module input/output port, resistance
Holding parallel connection direct resistance turns into the important object that power module is measured.The conventional method for surveying D.C. resistance is constant flow method and perseverance
Piezoresistance partial pressure method.Constant flow method circuit is general more complicated, is generally used in desk-top universal meter, by using certain constant current
Measured piece is measured, and detects that its both end voltage calculates measurement result, yet with the big resistance capacitance of measured piece
And the influence of current source charging inertia, measure and reach that the stable time is very long, process is slow, in the overall situation of large-scale production
Under, seriously hinder the raising of production efficiency.Further, since being measured using constant current, the voltage being tested on port is uncontrollable, for
The device of low pressure output, may produce overvoltage damage circuit devcie port in measurement process.Constant pressure rule passes through resistance point
Pressure mode is measured, and circuit is simple, is usually used in handheld multimeter, for measurement of the big resistance capacitance in the case of in parallel according to
So there is time of measuring very long, the uncontrollable situation of measurement bias voltage is present.The power module port D.C. resistance is quickly surveyed
Measuring circuit has higher novelty and significant application value.
The content of the invention
In order to overcome above mentioned problem, the present invention provides a kind of practical power module port quick measurement of DC resistance electricity
Road.The circuit measuring fast and stable；Measurement efficiency is not influenceed by tested port difference, adapts to various measurands；Biased electrical
Pressure is adjustable, can prevent output overvoltage from damaging low pressure measured piece；Measuring circuit has multiple ranges, improves circuit measuring precision.
Fast with measuring speed, measurement stability is good, good measuring accuracy, the advantage of adaptability and strong antijamming capability.
What the purpose of the present invention was realized by following technical solution：A kind of D.C. resistance for power module port is fast
Fast measuring circuit, including feedback regulating circuit, range switching matrix circuit and voltage and current detection circuit；The feedback regulation electricity
The input on road terminates a bias voltage, and output end is connected with the input of range switching matrix circuit, range switching matrix circuit
For connecting voltage and current detection circuit and measured device port, voltage and current detection circuit is also connected with measured device port,
The voltage and current detection circuit is connected with external microcontroller, and bias voltage is exported by microprocessor control DAC1.
Further, the feedback regulating circuit includes integrated transporting discharging U2, electric capacity C1, electric capacity C2, resistance R1 and resistance R8, institute
Resistance R8 and electric capacity C2 composition single order RC filter circuits are stated, microprocessor control DAC1 output is used as after being filtered by single order RC
Bias voltage access integrated transporting discharging U2 in-phase input end, integrated transporting discharging U2 output end is connected to integrated transporting discharging by resistance R1
U2 inverting input, the electric capacity C1 is parallel between integrated transporting discharging U2 output end and inverting input, and the one of resistance R1
Hold for connecting measured device port.
Further, the range switching matrix circuit includes resistance R2~R4, switch module I and switch module II；It is described
Resistance R4 one end is connected with integrated transporting discharging U2 output end, and resistance R4, switch module I and switch module II are sequentially connected in series company
Connect, switch module II is connected with measured device port；The resistance R2 is parallel to switch module I two ends, and resistance R3 is parallel to
Switch module II two ends.
Further, the switch module I includes relay K1, diode D3, resistance R7, resistance R11 and triode Q2, institute
Stating switch module II includes relay K2, diode D2, resistance R6, resistance R10 and triode Q1；The contact of the relay K1
In parallel with resistance R3, diode D3 is parallel to relay K1 coil two ends；Triode Q2 colelctor electrode and diode D3 is just
Pole is connected, and grounded emitter, base stage is connected with resistance R7 one end, and the resistance R7 other end is connected with I/O port, and the one of resistance R10
End is connected with IO ends, resistance R10 other end ground connection；The contact of the relay K2 is in parallel with resistance R2, and diode D2 is in parallel
In relay K1 coil two ends；Triode Q1 colelctor electrode is connected with diode D2 positive pole, grounded emitter, base stage and electricity
R6 one end connection is hindered, the resistance R6 other end is connected with I/O port, and resistance R11 one end is connected with I/O port, and resistance R11's is another
End ground connection；Diode D2 negative electrode is connected with diode D3 negative electrode and is followed by power supply VCC.
Further, the voltage and current detection circuit includes ADC U1, resistance R5 and resistance R9, the resistance R5 and resistance
R9 is connected and is grounded, and the benchmark input end of the ADC U1 is connected with the common port of amplifier U2 output end and resistance R4, ADC
U1 signal acquisition terminal is used to connect measured piece port；The resistance R5 is connected with resistance R9 common port with ADC0.
Further, measuring circuit also includes diode D1 and diode D4, the plus earth of the diode D4, diode
D4 negative pole is connected with diode D1 positive pole, and diode D1 negative pole meets power supply VCC, and diode D1 is public with diode D4's
End is connected with amplifier U2 output end.
As a result of above technical scheme, the present invention has following advantageous effects：
The present invention is a kind of simple and practical circuit, applied to fast-speed direct current resistance measurement, to various capacitance-resistance parallel connection directs
The measurement fast and stable of resistance, time of measuring is hardly influenceed by the resistance capacitance of measurand, and adjustable bias anti-can be exported
Pressure, the multrirange structure connected using measuring resistance can be measured than large range of D.C. resistance, the degree of accuracy is high.The circuit
It can be controlled with reference to micro-control unit and data processing, scalability is good.
Brief description of the drawings
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into
The detailed description of one step, wherein：
Fig. 1 is power module port circuit for quick measurement of DC resistance schematic block diagram in embodiment；
Fig. 2 is the schematic diagram of power module port circuit for quick measurement of DC resistance in embodiment；
Fig. 3 is stable pair of the measurement result output of quick measuring circuit and other direct current resistance m easurem ent modes in embodiment
Than；
Fig. 4 is the representative value and range ability relation of embodiment Plays resistance.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；It should be appreciated that preferred embodiment
Only for the explanation present invention, the protection domain being not intended to be limiting of the invention.
The schematic block circuit diagram of the present embodiment is as shown in figure 1, microcontroller is passed through by bus communication setting bias voltage
The fixed low bias voltage of the stable output of feedback regulating circuit, after amplifier output end is stable, microcontroller is gathered by outside ADC
The voltage of amplifier output end, and suitable range is adjusted according to testing result, finally by internal high position ADC examination criterias resistance with
The voltage ratio of tested port calculates DC resistance.
Power module port circuit for quick measurement of DC resistance schematic diagram is as shown in figure 1, a kind of be used for power module port
Circuit for quick measurement of DC resistance, including feedback regulating circuit, range switching matrix circuit and voltage and current detection circuit；Institute
The input for stating feedback regulating circuit terminates a bias voltage, and output end is connected with the input of range switching matrix circuit, range
Switching matrix circuit is used to connect voltage and current detection circuit and measured device port, voltage and current detection circuit also with tested device
Part port is connected, and the voltage and current detection circuit is connected with external microcontroller, and bias voltage controls DAC1 by microprocessor
Output.
The feedback regulating circuit includes integrated transporting discharging U2, electric capacity C1, electric capacity C2, resistance R1 and resistance R8, the resistance
R8 and electric capacity C2 composition single order RC filter circuits, microprocessor control DAC1 output is used as biased electrical after being filtered by single order RC
The in-phase input end into integrated transporting discharging U2 is crimped, integrated transporting discharging U2 output end is connected to the anti-of integrated transporting discharging U2 by resistance R1
Phase input, the electric capacity C1 is parallel between integrated transporting discharging U2 output end and inverting input, and resistance R1 one end is used for
Connect measured device port.
The range switching matrix circuit includes resistance R2~R4, switch module I and switch module II；The resistance R4's
One end is connected with integrated transporting discharging U2 output end, and resistance R4, switch module I and switch module II are sequentially connected in series, switching molding
Block II is connected with measured device port；The resistance R2 is parallel to switch module I two ends, and resistance R3 is parallel to switch module II
Two ends.
The switch module I includes relay K1, diode D3, resistance R7, resistance R11 and triode Q2, the switch
Module ii includes relay K2, diode D2, resistance R6, resistance R10 and triode Q1；The contact of the relay K1 and resistance
R3 is in parallel, and diode D3 is parallel to relay K1 coil two ends；Triode Q2 colelctor electrode is connected with diode D3 positive pole,
Grounded emitter, base stage is connected with resistance R7 one end, and the resistance R7 other end is connected with I/O port, resistance R10 one end and IO
End connection, resistance R10 other end ground connection；The contact of the relay K2 is in parallel with resistance R2, and diode D2 is parallel to relay
Device K1 coil two ends；Triode Q1 colelctor electrode is connected with diode D2 positive pole, grounded emitter, and base stage is with resistance R6's
One end is connected, and the resistance R6 other end is connected with I/O port, and resistance R11 one end is connected with I/O port, resistance R11 another termination
Ground；Diode D2 negative electrode is connected with diode D3 negative electrode and is followed by power supply VCC.
The voltage and current detection circuit includes ADC U1, resistance R5 and resistance R9, and the resistance R5 connects with resistance R9
And be grounded, the benchmark input end of the ADC U1 is connected with the common port of amplifier U2 output end and resistance R4, ADC U1 letter
Number collection terminal is used to connect measured piece port；The resistance R5 is connected with resistance R9 common port with ADC0.
Measuring circuit also includes diode D1 and diode D4, and the plus earth of the diode D4, diode D4's is negative
Pole is connected with diode D1 positive pole, and diode D1 negative pole connects power supply VCC, diode D1 and diode D4 common port and fortune
Put U2 output end connection.
Microprocessor control DAC1 outputs as measurement bias voltage after single order RC filtering by accessing integrated transporting discharging U2's
In-phase input end, integrated transporting discharging U2 output ends constitute negative voltage feedback by the resistance R1 inverting inputs for being connected to amplifier.Amount
Journey switching matrix circuit uses the mode of series connection stepping, the driving relay completion resistance measurement of microprocessor control IO control ports
The switching of range.Microcontroller communicates measurement standard resistance and the voltage of tested port by spi bus with high-order adc circuit U1
Ratio.The clamp circuit that abnormal input voltage is protected is constituted using diode D1, D4.ADC0 is passed through by resistance R5, R9 partial pressure
Integrated transporting discharging U2 output end voltage is measured, the range of adjustment measurement in real time improves measurement accuracy.
In the present invention, the calculation formula of tested port resistance is：
In formula：RxTo be tested port resistance, unit is Ω；
N is adc circuit U1 conversion digit, no unit；
D is the transformation result that U1 is read, no unit；
RrefFor the corresponding standard electric resistance of selected range, unit is Ω.
Due to the bias voltage measurement that measuring circuit is used in embodiment, U1 is using the reference data voltage floated, reference
Voltage is proportional to tested port voltage, can so make full use of ADC digit, improves the precision of direct current resistance m easurem ent.
The measurement output of quick measuring circuit and other direct current resistance m easurem ent modes is stable to such as Fig. 3 institutes in embodiment
Show, set that tested port is in parallel with 4700uF electric capacity as 10k Ω resistance, quick measuring circuit measuring resistance is 300 ohm, in addition
Two ways is the partial pressure method measurement that bias voltage is 3V and 100uA constant flow method measurement.It can be seen that power module direct current
The direct current resistance m easurem ent stabilized speed of the quick measuring circuit of resistance is quickly, steady compared to other two kinds of resistance measurement modes tens seconds
Fix time and be greatly decreased, so that the measurement efficiency of D.C. resistance is improved more than decades of times.
The measuring resistance and the relation of direct current resistance m easurem ent scope selected in embodiment are as shown in figure 4, measuring resistance is used
The mode of series connection switching forms matrix, it is to avoid the situation of resistive short.Using 3 measuring resistances R4, R2 and R3 in embodiment, point
Not Wei 3 Ω, 297 Ω (27 Ω connect with 270 Ω and obtained) and 29.7k Ω (2.7k Ω connect with 27k Ω and obtained), use relay
K1 and K2 carry out the stepping of current measurement, and the measurement range of D.C. resistance is respectively the Ω of 1 Ω~150,100 Ω~15k Ω and 10k
Ω~1.5M Ω.Each range, which is all provided with, outranges scope, it is to avoid when critical resistance is measured relay it is unstable repeatedly
Saltus step, improves measurement stability.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, it is clear that those skilled in the art
Member can carry out various changes and modification to the present invention without departing from the spirit and scope of the present invention.So, if the present invention
These modifications and variations belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to include these
Including change and modification.
Claims (6)
1. a kind of circuit for quick measurement of DC resistance for power module port, it is characterised in that：Including feedback regulating circuit,
Range switching matrix circuit and voltage and current detection circuit；The input of the feedback regulating circuit terminates a bias voltage, output
End be connected with the input of range switching matrix circuit, range switching matrix circuit for connect voltage and current detection circuit and by
Device interface is surveyed, voltage and current detection circuit is also connected with measured device port, and the voltage and current detection circuit and outside are micro-
Controller is connected, and bias voltage is exported by microprocessor control DAC1.
2. a kind of circuit for quick measurement of DC resistance for power module port according to claim 1, its feature exists
In：The feedback regulating circuit includes integrated transporting discharging U2, electric capacity C1, electric capacity C2, resistance R1 and resistance R8, the resistance R8 and electricity
Hold C2 composition single order RC filter circuits, microprocessor control DAC1 output is used as bias voltage after being filtered by single order RC and accessed
Integrated transporting discharging U2 in-phase input end, integrated transporting discharging U2 output end is connected to integrated transporting discharging U2 anti-phase input by resistance R1
End, the electric capacity C1 is parallel between integrated transporting discharging U2 output end and inverting input, and resistance R1 one end is used to connect quilt
Survey device interface.
3. a kind of circuit for quick measurement of DC resistance for power module port according to claim 1, its feature exists
In：The range switching matrix circuit includes resistance R2~R4, switch module I and switch module II；One end of the resistance R4
It is connected with integrated transporting discharging U2 output end, resistance R4, switch module I and switch module II are sequentially connected in series, switch module II
It is connected with measured device port；The resistance R2 is parallel to switch module I two ends, and resistance R3 is parallel to the two of switch module II
End.
4. a kind of circuit for quick measurement of DC resistance for power module port according to claim 3, its feature exists
In：The switch module I includes relay K1, diode D3, resistance R7, resistance R11 and triode Q2, the switch module II
Including relay K2, diode D2, resistance R6, resistance R10 and triode Q1；The contact of the relay K1 and resistance R3 are simultaneously
Connection, diode D3 is parallel to relay K1 coil two ends；Triode Q2 colelctor electrode is connected with diode D3 positive pole, transmitting
Pole is grounded, and base stage is connected with resistance R7 one end, and the resistance R7 other end is connected with I/O port, and resistance R10 one end and IO ends connect
Connect, resistance R10 other end ground connection；The contact of the relay K2 is in parallel with resistance R2, and diode D2 is parallel to relay K1
Coil two ends；Triode Q1 colelctor electrode is connected with diode D2 positive pole, grounded emitter, base stage and resistance R6 one end
Connection, the resistance R6 other end is connected with I/O port, and resistance R11 one end is connected with I/O port, resistance R11 other end ground connection；Two
Pole pipe D2 negative electrode is connected with diode D3 negative electrode and is followed by power supply VCC.
5. a kind of circuit for quick measurement of DC resistance for power module port according to claim 4, its feature exists
In：The voltage and current detection circuit includes ADC U1, resistance R5 and resistance R9, and the resistance R5 connects and connect with resistance R9
Ground, the benchmark input end of the ADC U1 is connected with the common port of amplifier U2 output end and resistance R4, and ADC U1 signal is adopted
Collection end is used to connect measured piece port；The resistance R5 is connected with resistance R9 common port with ADC0.
6. a kind of circuit for quick measurement of DC resistance for power module port according to claim 4, its feature exists
In：Measuring circuit also includes diode D1 and diode D4, the plus earth of the diode D4, diode D4 negative pole and two
Pole pipe D1 positive pole connection, diode D1 negative pole connects power supply VCC, diode D1 and diode D4 common port with amplifier U2's
Output end is connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710423614.4A CN107219402B (en) | 2017-06-07 | 2017-06-07 | A kind of circuit for quick measurement of DC resistance for power module port |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710423614.4A CN107219402B (en) | 2017-06-07 | 2017-06-07 | A kind of circuit for quick measurement of DC resistance for power module port |
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| CN107219402A true CN107219402A (en) | 2017-09-29 |
| CN107219402B CN107219402B (en) | 2019-06-21 |
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Cited By (6)
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| CN109917306A (en) * | 2019-03-13 | 2019-06-21 | 中国电子科技集团公司第二十四研究所 | It is a kind of for testing the device of power supply product adjustment end function |
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| CN110488205A (en) * | 2018-10-24 | 2019-11-22 | 新华三技术有限公司 | A kind of fault identification device |
| CN110554241A (en) * | 2019-10-08 | 2019-12-10 | 哈尔滨市科佳通用机电股份有限公司 | locomotive signal receiving coil insulation resistance on-vehicle test method and device |
| CN110687343A (en) * | 2019-10-22 | 2020-01-14 | 阳光电源股份有限公司 | Leakage current detection method and circuit |
| CN111413547A (en) * | 2020-05-06 | 2020-07-14 | 苏州市运泰利自动化设备有限公司 | Mainboard resistance test system and method |
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| CN109975616B (en) * | 2018-12-29 | 2021-08-17 | 浙江机电职业技术学院 | Wide-range high-precision resistance tester |
| CN109917306A (en) * | 2019-03-13 | 2019-06-21 | 中国电子科技集团公司第二十四研究所 | It is a kind of for testing the device of power supply product adjustment end function |
| CN110554241A (en) * | 2019-10-08 | 2019-12-10 | 哈尔滨市科佳通用机电股份有限公司 | locomotive signal receiving coil insulation resistance on-vehicle test method and device |
| CN110687343A (en) * | 2019-10-22 | 2020-01-14 | 阳光电源股份有限公司 | Leakage current detection method and circuit |
| CN111413547A (en) * | 2020-05-06 | 2020-07-14 | 苏州市运泰利自动化设备有限公司 | Mainboard resistance test system and method |
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|---|---|
| CN107219402B (en) | 2019-06-21 |
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