CN111929540A - Voltage withstand measurement circuit and method for switching device - Google Patents
Voltage withstand measurement circuit and method for switching device Download PDFInfo
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- CN111929540A CN111929540A CN201910395400.XA CN201910395400A CN111929540A CN 111929540 A CN111929540 A CN 111929540A CN 201910395400 A CN201910395400 A CN 201910395400A CN 111929540 A CN111929540 A CN 111929540A
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- 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
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- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The invention provides a voltage withstand measurement circuit and a voltage withstand measurement method for a switching device, which comprise a test power supply, the switching device to be tested, a peak current measurement circuit and an equivalent impedance measurement circuit, wherein the first end of the peak current measurement circuit is connected with the first end of the test power supply, the second end of the peak current measurement circuit is connected with the first end of the switching device to be tested, and the second end of the switching device to be tested is connected with the second end of the test power supply; the first end of the equivalent impedance measuring circuit is connected with the second end of the peak current measuring circuit, the second end of the equivalent impedance measuring circuit is connected with the second end of the testing power supply, and the equivalent impedance measuring circuit is connected with the switching device to be tested in parallel. By adopting the scheme, the measurement of the working withstand voltage of the switching device is divided into the peak current and the equivalent resistance, and the withstand voltage is obtained by calculating the peak current and the equivalent resistance, so that the influence of the parasitic capacitance of the probe is avoided, the working withstand voltage of the switching device can be accurately measured, and the working safety interval of the switching device is determined.
Description
Technical Field
The invention relates to the field of voltage withstand measurement of switching devices, in particular to a voltage withstand measurement circuit and method of a switching device.
Background
According to the relevant standards, automotive electronics are subjected to Hipot tests, typically with a voltage withstand of 2 × U +1000(Vac) ac, where U is the operating voltage. In recent years, as the voltage of the power battery of the electric automobile is higher and higher, the withstand voltage of a single switching device cannot be endured, and the series connection of two or more switching devices has become a trend. The voltage division of two or more switching devices is not the same due to the different parasitic parameters of each switching device. Generally, in order to ensure the safety and reliability of the switching devices, the operating withstand voltage of the switching devices does not exceed 60% of the maximum withstand voltage thereof, so that the operating withstand voltage of each switching device needs to be measured to determine that the switching device operates in a safety region. In the prior art, in order to test the withstand voltage of the switching device, high-voltage differential probes are used and are respectively connected in parallel at two ends of the switching device, because the high-voltage differential probes have parasitic capacitance, the equivalent impedance of the high-voltage differential probes is generally MOhm level, and the equivalent impedance of the high-voltage differential probes in the turn-off state of the switching device is also MOhm level, therefore, when the high-voltage differential probes are connected in parallel at two ends of the switching device, actually, the withstand voltage on the switching device is reduced, and the accuracy of the withstand voltage measurement of the switching device is seriously influenced.
The invention provides a circuit and a method for measuring the withstand voltage of a switching device, which do not directly adopt a high-voltage differential probe to directly measure the withstand voltage of the switching device, but separately measure the peak current and the equivalent resistance which can be born by a switching tube, further calculate the working withstand voltage of the switching device, and effectively avoid the problem that the parasitic capacitance of the high-voltage differential probe influences the measurement result, thereby accurately measuring the working withstand voltage of the switching device.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide a circuit and a method for measuring the withstand voltage of a switching device, which can effectively avoid the influence of the parasitic capacitance of a high-voltage differential probe on the measurement, thereby accurately measuring the working withstand voltage of the switching device.
The invention discloses a voltage withstand measuring circuit of a switch device, which comprises a test power supply and the switch device to be tested, and is characterized by also comprising a peak current measuring circuit and an equivalent impedance measuring circuit, wherein the first end of the peak current measuring circuit is connected with the first end of the test power supply, the second end of the peak current measuring circuit is connected with the first end of the switch device to be tested, and the second end of the switch device to be tested is connected with the second end of the test power supply; the first end of the equivalent impedance measuring circuit is connected with the second end of the peak current measuring circuit, the second end of the equivalent impedance measuring circuit is connected with the second end of the testing power supply, and the equivalent impedance measuring circuit is connected with the switch device to be tested in parallel.
Preferably, the number of the to-be-tested switch devices is two, and the to-be-tested switch devices include a first switch device and a second switch device, a first end of the first switch device is connected to a second end of the peak current measuring circuit, a second end of the first switch device is connected to a first end of the second switch device, and a second end of the second switch device is connected to a second end of the test power supply.
Preferably, the peak current measuring circuit comprises a fifth resistor R5, a differential circuit and a peak detection circuit; the first end of the fifth resistor R5 is connected with the first end of the test power supply, the second end of the fifth resistor R5 is connected with the first end of the to-be-tested switch device, the differential circuit is connected with the fifth resistor R5 in parallel, the first end and the second end of the differential circuit are correspondingly connected with the first end and the second end of the fifth resistor R5, and the peak detection circuit is connected with the third end of the differential circuit.
Preferably, the equivalent impedance measuring circuit comprises a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9; a first end of the first resistor R1 is connected to a first end of the first switching device, a second end of the first switch S1 is connected to a second end of the first switch S1 is connected to a first end of the second resistor R2, a second end of the second resistor R2 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to a first end of the second switch S2, a second end of the second switch S2 is connected to a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is connected to a second end of the second switching device; a first end of the fourth switch S4 is connected to a first end of the first resistor R1 and a first end of the first switching device, a second end of the fourth switch S4 is connected to a first end of the sixth resistor R6, a second end of the sixth resistor R6 is connected to a first end of the seventh resistor R7, a second end of the seventh resistor R7 is connected to a first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected to a first end of the ninth resistor R9, and a second end of the ninth resistor R9 is connected to a second end of the fourth resistor R4 and a second end of the second switching device; a second terminal of the first switch device and a first terminal of the second switch device are connected to a first terminal of the third switch S3, and a second terminal of the second resistor R2, a first terminal of the third resistor R3, a second terminal of the seventh resistor R7, and a first terminal of the eighth resistor R8 are connected to a second terminal of the third switch S3.
Preferably, the fourth switch S4 is located between the first switch device and the first resistor R1, a first terminal of the fourth switch S4 is connected to a first terminal of the first switch device, and a first terminal of the first resistor R1 and a first terminal of the sixth resistor R6 are connected to a second terminal of the fourth switch S4.
Preferably, the third switch S3 is located between the second switch device and the fourth resistor R4, a first end of the third switch S3 is connected to a second end of the second switch device, and a second end of the fourth resistor R4 and a second end of the ninth resistor R9 are connected to a second end of the third switch S3.
Preferably, the first resistor R1, the fourth resistor R4, the sixth resistor R6 and the ninth resistor R9 are equal in resistance; the resistance values of the second resistor R2, the third resistor R3, the seventh resistor R7 and the eighth resistor R8 are equal.
Preferably, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are all equal.
The invention also discloses a method for measuring the withstand voltage of the switching device, which adopts the withstand voltage measuring circuit of the switching device and comprises the following steps,
step 1: calculating an equivalent impedance RS1 of the first switching device and an equivalent impedance RS2 of the second switching device according to the measurement of an equivalent impedance measuring circuit;
step 2: calculating a peak current Ipeak of the first and second switching devices from the peak current measurement circuit measurement;
and step 3: calculating a withstand voltage of the first switching device as Ipeak RS1 from the equivalent impedance RS1 of the first switching device and the peak current Ipeak, and calculating a withstand voltage of the second switching device as Ipeak RS2 from the equivalent impedance RS2 of the second switching device and the peak current Ipeak.
The invention also discloses a method for measuring the withstand voltage of the switching device, which adopts the withstand voltage measuring circuit of the switching device and comprises the following steps,
step 1: closing the third switch S3 and the fourth switch S4, closing the first switch S1, opening the second switch S2, and collecting a first terminal voltage V1 of the seventh resistor R7 and a second terminal voltage V2 of the eighth resistor R8;
step 2: closing the third switch S3 and the fourth switch S4, opening the first switch S1, closing the second switch S2, collecting a first terminal voltage V1_1 of the seventh resistor R7 and a second terminal voltage V2_1 of the eighth resistor R8;
and step 3: opening the first switch S1, the third switch S3 and the fourth switch S4, and collecting the voltage V3 at the second end of the peak detection circuit;
and 4, step 4: calculating an equivalent impedance RS1 of the first switching device and an equivalent impedance RS2 of the second switching device according to voltages V1, V2, V1_1 and V2_1, and calculating a peak current Ipeak of the first switching device and the second switching device according to a voltage V3;
and 5: calculating a withstand voltage of the first switching device as Ipeak RS1 from the equivalent impedance RS1 of the first switching device and the peak current Ipeak, and calculating a withstand voltage of the second switching device as Ipeak RS2 from the equivalent impedance RS2 of the second switching device and the peak current Ipeak.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the influence of the parasitic capacitance of the voltage probe on the accuracy of voltage resistance measurement is effectively avoided;
2. the working withstand voltage of the switching device can be accurately measured;
3. the circuit is simple and reliable.
Drawings
FIG. 1 is a schematic diagram of a circuit for measuring withstand voltage of a switching tube according to a preferred embodiment of the present invention;
FIG. 2 is a circuit diagram of a voltage withstand measurement circuit of a switch tube according to a preferred embodiment of the present invention;
FIG. 3 is a circuit diagram of a voltage withstand measurement circuit of a switching tube according to another preferred embodiment of the present invention;
fig. 4 is a circuit configuration diagram of a switch tube withstand voltage measuring circuit according to another preferred embodiment of the present invention.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, a schematic diagram of a structure of a switching tube withstand voltage measuring circuit according to a preferred embodiment of the present invention includes a test power supply, a switching device to be tested, a peak current measuring circuit and an equivalent impedance measuring circuit, where a first end of the peak current measuring circuit is connected to a first end of the test power supply, a second end of the peak current measuring circuit is connected to a first end of the switching device to be tested, and a second end of the switching device to be tested is connected to a second end of the test power supply; the first end of the equivalent impedance measuring circuit is connected with the second end of the peak current measuring circuit, and the second end of the equivalent impedance measuring circuit is connected with the second end of the test power supply. The circuit is different from the traditional method of directly measuring the working withstand voltage of the switching device by adopting a voltage probe, the voltage probe has parasitic capacitance, and the equivalent impedance of the voltage probe and the equivalent impedance of the switching device in a turn-off state are in the same order of magnitude, so that a larger error is brought to a measuring result. The circuit converts the measurement of the working withstand voltage into the measurement of peak current and the measurement of equivalent impedance, thereby avoiding the influence of the parasitic capacitance of the voltage probe on the measurement result and further accurately measuring the working withstand voltage of the switching device to be measured.
Referring to fig. 2, a circuit configuration diagram of a voltage withstand test circuit of a switching tube according to a preferred embodiment of the present invention is shown, where the number of switching devices to be tested is two, and the two switching devices include a first switching device and a second switching device, the two switching devices are connected in series, a first end of the first switching device is connected to a second end of the peak current measurement circuit, a second end of the first switching device is connected to a first end of the second switching device, and a second end of the second switching device is connected to a second end of the test power supply, and this circuit connection manner can measure the operating voltage withstand of the two switching tubes at one time. The number of switching devices in the present invention is not limited to two, and may be one, three, four, or more.
With continued reference to fig. 2, the peak current measuring circuit includes a fifth resistor R5, a differential circuit, and a peak detector circuit; the first end of the fifth resistor R5 is connected with the first end of the test power supply, the second end of the fifth resistor R5 is connected with the first end of the to-be-tested switch device, the differential circuit is connected with the fifth resistor R5 in parallel, the first end and the second end of the differential circuit are correspondingly connected with the first end and the second end of the fifth resistor R5, and the peak detection circuit is connected with the third end of the differential circuit. The peak current measuring circuit is connected with the switching device to be tested in series, can measure the peak current which can be borne by the switching device to be tested, and because the impedance on the differential circuit is infinite, no current flows through the differential circuit, the current flowing through R5 is equal to the main circuit current flowing out from the test current and is equal to the current flowing through the switching tubeTherefore, only the current flowing through R5 needs to be measured to obtain the peak current. The differential circuit and the peak detection circuit are used for measuring the voltage at two ends of R5, the voltage at one end of the peak detection circuit far away from the differential circuit, which is measured when the switching device is about to break down, is V3, and the effective value Isense of the current flowing through R5 is
Thus, it is possible to provide
With continued reference to fig. 2, the equivalent impedance measuring circuit includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9; the 8 resistors are connected in parallel and in series, R1 is connected in series with R2, R6 is connected in series with R7, a series circuit of R1 and R2 is connected in parallel with a series circuit of R6 and R7, R3 is connected in series with R4, R8 is connected in series with R9, a series circuit of R3 and R4 is connected in parallel with a series circuit of R8 and R9, and the two parallel circuits are connected in series. Specifically, a first end of a first resistor R1 is connected to a first end of a first switching device, a second end is connected to a first end of a first switch S1, a second end of the first switch S1 is connected to a first end of a second resistor R2, a second end of a second resistor R2 is connected to a first end of a third resistor R3, a second end of the third resistor R3 is connected to a first end of the second switch S2, a second end of the second switch S2 is connected to a first end of a fourth resistor R4, and a second end of the fourth resistor R4 is connected to a second end of the second switching device; a first end of a fourth switch S4 is connected to a first end of a first resistor R1 and a first end of a first switching device, a second end of the fourth switch S4 is connected to a first end of a sixth resistor R6, a second end of the sixth resistor R6 is connected to a first end of a seventh resistor R7, a second end of the seventh resistor R7 is connected to a first end of an eighth resistor R8, a second end of the eighth resistor R8 is connected to a first end of a ninth resistor R9, and a second end of the ninth resistor R9 is connected to a second end of a fourth resistor R4 and a second end of the second switching device; the second terminal of the first switch device and the first terminal of the second switch device are connected to the first terminal of the third switch S3, and the second terminal of the second resistor R2, the first terminal of the third resistor R3, the second terminal of the seventh resistor R7, and the first terminal of the eighth resistor R8 are connected to the second terminal of the third switch S3. In fig. 2, RS1 and RS2 are equivalent impedances of the first switch tube and the second switch tube, respectively, and are not real resistors, and the two resistors do not exist really when the circuit is designed. Through the opening and closing of the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4, a first end voltage V1 of the 7 th resistor R7 and a second end voltage V2 of the eighth resistor R8 in two different states are measured, so that RS1 and RS2 are obtained through calculation, and then peak current Ipeak obtained by combining a peak current measuring circuit is obtained, the withstand voltage of the first switching device is Ipeak RS1, and the withstand voltage of the second switching device is Ipeak RS 2. When the peak current is measured, the first switch S1, the third switch S3 and the fourth switch S4 are all required to be opened, so that the equivalent impedance measuring circuit is excluded from the circuit, and when the equivalent impedance is measured, the third switch S3 and the fourth switch S4 are required to be closed, so that the equivalent impedance measuring circuit is ensured to work in the circuit.
Through the circuit design, the maximum voltage which can be borne by the switching tube is not directly measured by adopting the high-voltage differential probe, but the equivalent resistance and the peak current are separately measured, so that the working withstand voltage of the switching device is calculated, the influence of the parasitic capacitance of the high-voltage differential probe on the measurement is avoided, the error is greatly reduced, and the measurement is simple and reliable.
Referring to fig. 3, the fourth switch S4 is located between the first switch device and the first resistor R1, the first terminal of the fourth switch S4 is connected to the first terminal of the first switch device, and the first terminal of the first resistor R1 and the first terminal of the sixth resistor R6 are connected to the second terminal of the fourth switch S4. At this time, when the peak current is measured, the third switch S3 and the fourth switch S4 need to be disconnected, so that the equivalent impedance measurement circuit can be excluded from the circuit, and the on-off of the first switch S1 and the second switch S2 does not affect the state of the circuit; when the equivalent impedance is measured, the third switch S3 and the fourth switch S4 are closed to ensure that the equivalent impedance measurement circuit works in the circuit, the circuit is in different states by switching on and off the first switch S1 and the second switch S2, and then the first end voltage V1 of the seventh resistor R7 and the second end voltage V2 of the eighth resistor R8 in different states are measured to form a circuit equation set, so that RS1 and RS2 are obtained through calculation.
Referring to fig. 4, the third switch S3 is located between the second switch device and the fourth resistor R4, the first terminal of the third switch S3 is connected to the second terminal of the second switch device, and the second terminal of the fourth resistor R4 and the second terminal of the ninth resistor R9 are connected to the second terminal of the third switch S3. At this time, when the peak current is measured, the third switch S3 and the fourth switch S4 need to be disconnected, so that the equivalent impedance measurement circuit can be excluded from the circuit, and the on-off of the first switch S1 and the second switch S2 does not affect the state of the circuit; when the equivalent impedance is measured, the third switch S3 and the fourth switch S4 are closed to ensure that the equivalent impedance measurement circuit works in the circuit, the circuit is in different states by switching on and off the first switch S1 and the second switch S2, and then the first end voltage V1 of the seventh resistor R7 and the second end voltage V2 of the eighth resistor R8 in different states are measured to form a circuit equation set, so that RS1 and RS2 are obtained through calculation.
Referring to fig. 2, 3 and 4, the first resistor R1, the fourth resistor R4, the sixth resistor R6 and the ninth resistor R9 have the same resistance; the resistances of the second resistor R2, the third resistor R3, the seventh resistor R7 and the eighth resistor R8 are equal, the resistance values of the corresponding positions are equal, so that an equation set and a calculation formula can be simplified, and the RS1 and the RS2 can be calculated easily.
Referring to fig. 2, 3 and 4, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are all equal, so that the calculation formula can be simplified to the greatest extent and the calculation is simpler and more convenient by making all the resistances of the resistors equal.
Referring to fig. 1, a method for measuring the withstand voltage of a switching device, which uses the above-mentioned circuit for measuring the withstand voltage of a switching device, comprises the steps of,
step 1: calculating the equivalent impedance RS1 of the first switching device and the equivalent impedance RS2 of the second switching device according to the measurement of the equivalent impedance measuring circuit;
step 2: calculating the peak current Ipeak of the first switching device and the second switching device according to the measurement of the peak current measuring circuit;
and step 3: the withstand voltage of the first switching device is calculated as Ipeak RS1 from the equivalent impedance RS1 and the peak current Ipeak of the first switching device, and as Ipeak RS2 from the equivalent impedance RS2 and the peak current Ipeak of the second switching device.
By the measuring method, the equivalent resistance and the peak current are measured separately, the working withstand voltage of the switching device is calculated, the influence of the parasitic capacitance of the high-voltage differential probe on the measurement is avoided, the working withstand voltage of the switching device is accurately measured to determine the working safety interval of the switching device, and then the proper switching device is selected in the circuit, so that the safety and the stability of the circuit are guaranteed.
Referring to fig. 2, 3 and 4, a method for measuring a withstand voltage of a switching device, which uses the circuit for measuring a withstand voltage of a switching device, comprises the steps of,
step 1: closing the third switch S3 and the fourth switch S4, closing the first switch S1, opening the second switch S2, and collecting a first end voltage V1 of the seventh resistor R7 and a second end voltage V2 of the eighth resistor R8;
step 2: closing the third switch S3 and the fourth switch S4, opening the first switch S1, closing the second switch S2, and collecting a first terminal voltage V1_1 of the seventh resistor R7 and a second terminal voltage V2_1 of the eighth resistor R8;
and step 3: opening the first switch S1, the third switch S3 and the fourth switch S4, and collecting the voltage V3 at the second end of the peak detection circuit;
and 4, step 4: calculating an equivalent impedance RS1 of the first switching device and an equivalent impedance RS2 of the second switching device according to voltages V1, V2, V1_1 and V2_1, and calculating a peak current Ipeak of the first switching device and the second switching device according to a voltage V3;
and 5: calculating a withstand voltage of the first switching device as Ipeak RS1 from the equivalent impedance RS1 of the first switching device and the peak current Ipeak, and calculating a withstand voltage of the second switching device as Ipeak RS2 from the equivalent impedance RS2 of the second switching device and the peak current Ipeak.
Wherein the equation system for calculating the equivalent impedance RS1 of the first switching device and the equivalent impedance RS2 of the second switching device according to the voltages V1, V2, V1_1 and V2_1 is as follows:
for simplifying the calculation, the resistances of the first resistor R1, the fourth resistor R4, the sixth resistor R6 and the ninth resistor R9 are equal, and the resistances of the second resistor R2, the third resistor R3, the seventh resistor R7 and the eighth resistor R8 are equal, at this time, the calculation formulas of the RS1 and the RS2 are as follows:
wherein, RS-R1 + R2-R3 + R4-R6 + R7-R8 + R9; r1 ═ R4 ═ R6 ═ R9; r2 ═ R3 ═ R7 ═ R8.
Peak current of
Therefore, the operating withstand voltages of the first switching device and the second switching device are respectively as follows:
it should be noted that the two switching tubes may have the same or different specifications, and it is preferable to select two switching tubes having the same specification for measurement in order to more accurately measure the withstand voltage of the two switching tubes.
Besides such switch states, the opening and closing of the first switch S1 and the second switch S2 in steps 1 and 2 can be performed in three other combinations, and in the case of ensuring that the third switch S3 and the fourth switch S4 are closed, if a set of voltage data can be measured while both the first switch tube S1 and the second switch tube S2 are closed, and a set of voltage data can be measured while the first switch tube S1 is closed and the second switch tube S2 is opened, the calculation formula also needs to be changed.
By adopting the method, the equivalent resistance and the peak current can be separately measured, the working withstand voltage of the switching device can be further calculated, the influence of the parasitic capacitance of the high-voltage differential probe on the measurement is avoided, the error is greatly reduced, and the measurement is simple and reliable. By accurately measuring the working withstand voltage of the switching device by the method, the working safety interval of the switching device can be determined, and then a proper switching device is selected to work, so that the safe and reliable work of the circuit is guaranteed.
It should be noted that the embodiments of the present invention have been described with reference to the accompanying drawings, and it should be understood that the invention is not limited to the embodiments described above, but rather, by the following claims, the invention is capable of other embodiments.
Claims (10)
1. A voltage withstand measurement circuit of a switching device comprises a test power supply, at least one switching device to be tested, a peak current measurement circuit and an equivalent impedance measurement circuit,
the first end of the peak current measuring circuit is connected with the first end of the testing power supply, the second end of the peak current measuring circuit is connected with the first end of the to-be-tested switch device, and the second end of the to-be-tested switch device is connected with the second end of the testing power supply;
the first end of the equivalent impedance measuring circuit is connected with the second end of the peak current measuring circuit, the second end of the equivalent impedance measuring circuit is connected with the second end of the test power supply, and the equivalent impedance measuring circuit is connected with the switch device to be tested in parallel.
2. The switching device withstand voltage measuring circuit according to claim 1, wherein the number of the switching devices to be tested is two, and the switching devices include a first switching device and a second switching device, a first terminal of the first switching device is connected to the second terminal of the peak current measuring circuit, a second terminal of the first switching device is connected to the first terminal of the second switching device, and a second terminal of the second switching device is connected to the second terminal of the test power supply.
3. The switching device withstand voltage measuring circuit according to claim 1, wherein the peak current measuring circuit includes a fifth resistor R5, a differential circuit, and a peak detector circuit; the first end of the fifth resistor R5 is connected with the first end of the test power supply, the second end of the fifth resistor R5 is connected with the first end of the to-be-tested switch device, the differential circuit is connected with the fifth resistor R5 in parallel, the first end and the second end of the differential circuit are correspondingly connected with the first end and the second end of the fifth resistor R5, and the peak detection circuit is connected with the third end of the differential circuit.
4. The switching device withstand voltage measuring circuit according to claim 2, wherein the equivalent impedance measuring circuit includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9;
a first end of the first resistor R1 is connected to a first end of the first switching device, a second end of the first resistor R1 is connected to a first end of the first switch S1, a second end of the first switch S1 is connected to a first end of the second resistor R2, a second end of the second resistor R2 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to a first end of the second switch S2, a second end of the second switch S2 is connected to a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is connected to a second end of the second switching device;
a first end of the fourth switch S4 is connected to a first end of the first resistor R1 and a first end of the first switching device, a second end of the fourth switch S4 is connected to a first end of the sixth resistor R6, a second end of the sixth resistor R6 is connected to a first end of the seventh resistor R7, a second end of the seventh resistor R7 is connected to a first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected to a first end of the ninth resistor R9, and a second end of the ninth resistor R9 is connected to a second end of the fourth resistor R4 and a second end of the second switching device;
a second terminal of the first switch device and a first terminal of the second switch device are connected to a first terminal of the third switch S3, and a second terminal of the second resistor R2, a first terminal of the third resistor R3, a second terminal of the seventh resistor R7, and a first terminal of the eighth resistor R8 are connected to a second terminal of the third switch S3.
5. The switching device withstand voltage measuring circuit according to claim 4, wherein the fourth switch S4 is located between the first switching device and the first resistor R1, a first terminal of the fourth switch S4 is connected to a first terminal of the first switching device, and a first terminal of the first resistor R1 and a first terminal of the sixth resistor R6 are connected to a second terminal of the fourth switch S4.
6. The device withstand voltage measuring circuit according to claim 5, wherein the third switch S3 is located between the second switching device and the fourth resistor R4, a first terminal of the third switch S3 is connected to a second terminal of the second switching device, and a second terminal of the fourth resistor R4 and a second terminal of the ninth resistor R9 are connected to a second terminal of the third switch S3.
7. The switching device withstand voltage measuring circuit according to claim 4, wherein the first resistor R1, the fourth resistor R4, the sixth resistor R6 and the ninth resistor R9 are equal in resistance; the second resistor R2, the third resistor R3, the seventh resistor R7 and the eighth resistor R8 are equal in resistance.
8. The switching device withstand voltage measuring circuit according to claim 4, wherein the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are all equal in resistance.
9. A switching device withstand voltage measuring method characterized by using the switching device withstand voltage measuring circuit according to claim 2, the detecting step comprising,
step 1: calculating an equivalent impedance RS1 of the first switching device and an equivalent impedance RS2 of the second switching device according to the measurement of an equivalent impedance measuring circuit;
step 2: calculating a peak current Ipeak of the first and second switching devices from the peak current measurement circuit measurement;
and step 3: calculating a withstand voltage of the first switching device as Ipeak RS1 from the equivalent impedance RS1 of the first switching device and the peak current Ipeak, and calculating a withstand voltage of the second switching device as Ipeak RS2 from the equivalent impedance RS2 of the second switching device and the peak current Ipeak.
10. A switching device withstand voltage measuring method characterized by using the switching device withstand voltage measuring circuit according to any one of claims 4 to 7, the detecting step comprising,
step 1: closing the third switch S3 and the fourth switch S4, closing the first switch S1, opening the second switch S2, and collecting a first terminal voltage V1 of the seventh resistor R7 and a second terminal voltage V2 of the eighth resistor R8;
step 2: closing the third switch S3 and the fourth switch S4, opening the first switch S1, closing the second switch S2, collecting a first terminal voltage V1_1 of the seventh resistor R7 and a second terminal voltage V2_1 of the eighth resistor R8;
and step 3: opening the first switch S1, the third switch S3 and the fourth switch S4, and collecting the voltage V3 at the second end of the peak detection circuit;
and 4, step 4: calculating an equivalent impedance RS1 of the first switching device and an equivalent impedance RS2 of the second switching device according to voltages V1, V2, V1_1 and V2_1, and calculating a peak current Ipeak of the first switching device and the second switching device according to a voltage V3;
and 5: calculating a withstand voltage of the first switching device as Ipeak RS1 from the equivalent impedance RS1 of the first switching device and the peak current Ipeak, and calculating a withstand voltage of the second switching device as Ipeak RS2 from the equivalent impedance RS2 of the second switching device and the peak current Ipeak.
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