CN111983271A - Protection circuit for high-voltage insulation test - Google Patents
Protection circuit for high-voltage insulation test Download PDFInfo
- Publication number
- CN111983271A CN111983271A CN201910421920.3A CN201910421920A CN111983271A CN 111983271 A CN111983271 A CN 111983271A CN 201910421920 A CN201910421920 A CN 201910421920A CN 111983271 A CN111983271 A CN 111983271A
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- Prior art keywords
- voltage
- protection circuit
- processed
- unit
- detector
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- 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
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- 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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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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
Abstract
The invention provides a protection circuit for a high-voltage insulation test. The invention realizes the adjustment of the current and the voltage loaded on a unit to be processed, such as a switch tube, in the high-voltage insulation test circuit by configuring the current control unit and the voltage control unit, and avoids the damage caused by the overvoltage borne on the switch tube.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to a protection circuit for high-voltage insulation test.
Background
With the development of motorization of automobiles, the requirement on the voltage which can be provided by a battery is higher and higher, and the higher requirement on the pressure resistance of electronic devices in the automobiles is also provided. In order to ensure the safety of the automobile in use, it is specified that the electronic products in the automobile are subjected to a high voltage insulation test (Hipot test), in which an alternating voltage with a withstand voltage of 2 × U +1000(Vac) is generally required for the circuit where the electronic products are located, where U is an operating voltage. However, the voltage resistance of the switching tube in the circuit of the electronic product in the existing automobile is generally low, and the switching tube cannot bear the high voltage generated by the high-voltage insulation test, and the existing method is generally to use a mode of connecting two or more switching tubes in series to realize voltage division of the switching tube, but due to different parasitic parameters of the switching tube, the voltages loaded on the two or more switching tubes are different, so that a certain switching tube is damaged, and the design of the two or more switching tubes also increases the manufacturing process and manufacturing cost of the automobile.
Disclosure of Invention
In order to solve the above problems, the present invention provides a protection circuit for high voltage insulation test. The invention realizes the adjustment of the current and the voltage loaded on a unit to be processed, such as a switch tube, in the high-voltage insulation test circuit by configuring the current control unit and the voltage control unit, and avoids the damage caused by the overvoltage borne on the switch tube.
The protection circuit comprises a current control unit and a voltage control unit, wherein the current control unit is connected with a unit to be processed in the high-voltage insulation test circuit in series and used for adjusting the current value in the high-voltage insulation test circuit, and the voltage control unit is connected with the unit to be processed in parallel and used for adjusting the voltage values at two ends of the unit to be processed.
Preferably, in the protection circuit, the current control unit includes a reference resistor, a resistor connected in series with the reference resistor, an operational amplifier connected to the reference resistor, and a first detector connected to the operational amplifier, wherein the reference resistor and the resistor are connected in series with the unit to be processed.
Preferably, in the protection circuit, the resistor includes a variable resistor or a digital potentiometer.
Preferably, in the protection circuit, the first detector includes a peak detector.
Preferably, in the protection circuit, the voltage control unit includes a capacitor, a voltage divider connected in parallel with the capacitor, and a second detector connected to the voltage divider, wherein the capacitor is connected in parallel with the unit to be processed.
Preferably, in the protection circuit, the capacitor includes a programmable capacitor.
Preferably, in the protection circuit, the second detector includes a peak detector.
Preferably, the protection circuit further includes a microprocessor, wherein the resistor and the first detector are respectively connected to the microprocessor, and the microprocessor receives a voltage signal sent by the first detector and adjusts a resistance value of the resistor according to the voltage signal.
Preferably, the protection circuit further includes a microprocessor, the capacitor and the second detector are respectively connected to the microprocessor, and the microprocessor receives a voltage signal sent by the second detector and adjusts a resistance-capacitance value of the capacitor according to the voltage signal.
Compared with the prior art, the invention has the advantages that:
1) The protection circuit is arranged to adjust the load voltage or current of the unit to be processed, and the voltage resistance problem of the unit to be processed can be solved without resetting an original circuit where the unit to be processed is located;
2) the current and the voltage which can be born by the protection circuit can be adjusted, so that the protection circuit has a wider application range and has excellent market application prospect.
Drawings
FIG. 1 is a schematic diagram of a protection circuit for high voltage insulation testing according to a preferred embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a protection circuit for high voltage insulation test according to another preferred embodiment of the present invention;
fig. 3 is a schematic structural diagram of a protection circuit for high voltage insulation test according to another preferred embodiment of the present invention.
Detailed Description
The advantages of the invention are explained in detail below with reference to the drawings and the embodiments.
Fig. 1 is a schematic structural diagram of a protection circuit for high voltage insulation test according to a preferred embodiment of the present invention. As can be seen from the figure, the protection circuit provided by the present embodiment mainly includes: when the current control unit is used, the current control unit is connected in series with a unit to be processed waiting for high-voltage insulation test, so that the current passing through the current control unit can be adjusted by adjusting the resistance or the resistance-capacitance of the load in the current control unit, and the current control unit and the unit to be processed are in series connection, so that the adjustment of the magnitude of the current passing through the unit to be processed is realized; in addition, the protection circuit also comprises a voltage control unit, when in use, the voltage control unit is connected with the unit to be processed in parallel, so that the voltage value on the load can be adjusted by adjusting the resistance or the resistance-capacitance of the load in the voltage control unit, and the voltage control unit and the unit to be processed are in parallel connection, so that the voltage on the unit to be processed can be adjusted. The unit to be processed may be any electric device in the high voltage insulation test circuit, may be an electric device that needs to be subjected to a high voltage insulation test, and may also be an electric device that is in the high voltage insulation test circuit but does not substantially need to be subjected to a high voltage insulation test, but may also be subjected to a high voltage during the test process, including but not limited to a switch tube and the like.
As can be seen from the above, with the protection circuit provided in this embodiment, the voltage withstand problem of the unit to be processed can be solved without resetting the original circuit where the unit to be processed is located; and the current and voltage that the protection circuit can bear can be adjusted, thus, the protection circuit has wider application range.
Referring to fig. 2, in another preferred embodiment consistent with the present invention, the current control unit may include a reference resistor, a resistor, an operational amplifier and a first detector, wherein the reference resistor is connected in series with the resistor, the operational amplifier is connected to both ends of the reference resistor for obtaining a voltage across the reference resistor, and the first detector is connected to the operational amplifier for obtaining a stable voltage value from the alternating current. Therefore, when the circuit is used, the reference resistor and the resistor are connected in series to a circuit where the unit to be processed is located, the operational amplifier obtains the voltage at two ends of the reference resistor, after feedback processing is carried out, a voltage value in a certain proportional relation with the voltage value at two ends of the reference resistor is output, the first detector obtains a stable voltage value according to the changed voltage value output by the operational amplifier, the value of current passing through the resistor is calculated and obtained according to the voltage value and the resistance value of the reference resistor, and under the condition that the current in the circuit is known, the effect of sharing the voltage on the unit to be processed, such as a switching tube, can be realized by adjusting the resistance value of the resistor which is also connected in series to the circuit where the unit to be processed is located, and the damage of the unit to be processed, such as the switching tube, due.
Therefore, in order to more effectively guarantee the voltage endurance and the like of the unit to be processed, in a more preferred embodiment, the first detector is a peak detector, so that the current condition passing through the reference resistor when the alternating voltage is at the peak value in the high-voltage insulation test can be acquired, and the voltage endurance of the unit to be processed can be effectively guaranteed according to the resistance value of the current adjusting resistor.
Meanwhile, in order to improve the application range of the protection circuit, in a more preferred embodiment, the resistor may be a variable resistor or a digital potentiometer, so that the resistance value of the resistor can be adjusted within a certain range, the requirements of various actual test circuits are met, and the application range is wide.
Referring to fig. 3, in a more preferred embodiment, in order to further improve the intelligence of the protection circuit, the protection circuit further includes a microprocessor, and the microprocessor is connected to the first detector and the resistor, respectively, so that the microprocessor can receive the voltage value obtained by the first detector, calculate and obtain a current value in the circuit under the voltage value according to the voltage value and a resistance value of the reference resistor, and calculate and obtain a resistance value that the resistor should have under the condition that the safety of the unit to be processed is guaranteed under the current value, thereby sending an instruction to the resistor according to the resistance value, and controlling the resistor to adjust the resistance of the resistor to the resistance value.
With reference to fig. 2, in another preferred embodiment according to the present invention, the voltage control unit includes a capacitor, a voltage divider, and a second detector. Wherein the voltage divider is connected in parallel with the capacitor and the second detector is connected to the voltage divider. In use, the capacitor is connected in parallel to two ends of the unit to be processed, then, due to the parallel connection relationship, the capacitor is the same as the voltage at two ends of the unit to be processed, the voltage divider is connected in parallel with the capacitor, the divided voltage value at two ends of the capacitor can be obtained according to a certain proportion, for example, the divided voltage value can be 1/1500 of the voltage value at two ends of the capacitor, the second detector connected to the voltage divider can calculate and obtain a stable voltage value according to the divided voltage value, whether the voltage borne on the unit to be processed is within the withstand voltage range of the unit to be processed can be judged according to the voltage value, and when the voltage borne on the unit to be processed is overhigh, the voltage value on the capacitor can be adjusted by adjusting the resistance-capacitance value of the capacitor, so that. Therefore, the unit to be processed is always in the pressure-resistant range, and the use safety of the unit to be processed, such as a switching tube, is ensured.
Therefore, in order to more effectively guarantee the withstand voltage and other problems of the unit to be processed, in a more preferred embodiment, the second detector is a peak detector, so that the voltage on the unit to be processed when the alternating voltage is at the peak value in the high-voltage insulation test, that is, the maximum voltage carried by the unit to be processed can be obtained, the voltage is guaranteed to be within the withstand voltage range of the unit to be processed, the whole alternating voltage is within the withstand voltage range of the unit to be processed, and the use safety of the unit to be processed can be effectively guaranteed.
Meanwhile, in order to improve the application range of the protection circuit, in a more preferable embodiment, the capacitor can be a programmable capacitor, so that the resistance-capacitance value of the protection circuit can be adjusted within a certain range, the protection circuit is suitable for the requirements of various actual test circuits, and the application range is wide.
Referring to fig. 3, in a more preferred embodiment, to further increase the intelligence of the protection circuit, the microprocessor included in the protection circuit in the above embodiment is also connected to the second detector and the capacitor, respectively, so that, the microprocessor can receive the voltage division value obtained by the second detector, and calculate the voltage value on the unit to be processed according to the voltage division value, so as to judge whether the voltage value is in the withstand voltage range of the unit to be processed, if the voltage value exceeds the withstand voltage range of the unit to be processed, the capacitance value that the capacitor should have when the voltage across the unit to be processed, i.e. the voltage across the capacitor, is modulated within the standard withstand voltage value of the unit to be processed can be calculated based on the standard withstand voltage value of the unit to be processed and the voltage value, then, an instruction can be sent to the capacitor according to the rc value, and the capacitor is controlled to adjust its rc to the rc value.
In summary, the protection circuit of the present invention may further include a microprocessor, and the microprocessor controls the resistance and capacitance of the resistor and the capacitor according to the received electrical signals such as voltage and current, so as to adjust the voltage and current of the unit to be processed, thereby ensuring the safe use of the unit to be processed. The intelligence of the protection circuit is greatly improved, and the protection circuit has excellent market application prospect.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (9)
1. A protection circuit for high voltage insulation test is characterized by comprising
A current control unit connected in series with the unit to be processed in the high voltage insulation test circuit for adjusting a current value in the high voltage insulation test circuit, an
And the voltage control unit is connected with the unit to be processed in parallel and is used for adjusting the voltage values at the two ends of the unit to be processed.
2. The protection circuit of claim 1, wherein the current control unit comprises
The reference resistance is set to a reference resistance value,
a resistor in series with the reference resistance,
an operational amplifier connected to the reference resistor, an
A first detector connected to the operational amplifier, wherein
The reference resistance and the resistor are connected in series with the unit to be processed.
3. The protection circuit of claim 2,
the resistor comprises a variable resistor or a digital potentiometer.
4. The protection circuit of claim 2,
the first detector comprises a peak detector.
5. The protection circuit of claim 1, wherein the voltage control unit comprises
A capacitor, which is connected with the first capacitor,
a voltage divider connected in parallel with said capacitor, and
a second detector connected to the voltage divider, wherein
The capacitor is connected in parallel with the unit to be processed.
6. The protection circuit of claim 4,
the capacitor comprises a programmable capacitor.
7. The protection circuit of claim 4,
the second detector comprises a peak detector.
8. The protection circuit of claim 2, further comprising
A microprocessor for controlling the operation of the microprocessor,
the resistor and the first detector are respectively connected with the microprocessor,
and the microprocessor receives the voltage signal sent by the first detector and adjusts the resistance value of the resistor according to the voltage signal.
9. The protection circuit of claim 4, further comprising
A microprocessor for controlling the operation of the microprocessor,
the capacitor and the second detector are respectively connected with the microprocessor,
and the microprocessor receives the voltage signal sent by the second detector and adjusts the resistance-capacitance value of the capacitor according to the voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910421920.3A CN111983271A (en) | 2019-05-21 | 2019-05-21 | Protection circuit for high-voltage insulation test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910421920.3A CN111983271A (en) | 2019-05-21 | 2019-05-21 | Protection circuit for high-voltage insulation test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111983271A true CN111983271A (en) | 2020-11-24 |
Family
ID=73437153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910421920.3A Pending CN111983271A (en) | 2019-05-21 | 2019-05-21 | Protection circuit for high-voltage insulation test |
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| CN (1) | CN111983271A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB925027A (en) * | 1959-09-01 | 1963-05-01 | Siemens & Iialske Ag | A protective circuit arrangement for transistors |
| SU384100A1 (en) * | 1971-03-01 | 1973-05-23 | DC VOLTAGE STABILIZER WITH PROTECTION DEVICE | |
| EP0331251A2 (en) * | 1988-03-02 | 1989-09-06 | I.R.E. Industrie Riunite Eurodomestici S.p.A. | Overvoltage protection device for control circuits using power transistors |
| CN1372720A (en) * | 1999-09-03 | 2002-10-02 | 默勒有限公司 | Circuit arrangement for the overvoltage protection of a power transistor for controlling an inductive load |
| CN1432815A (en) * | 2002-01-18 | 2003-07-30 | 刘英彰 | Electronic load simulator with tested current loop impedance |
| CN201449402U (en) * | 2009-07-03 | 2010-05-05 | 南京民盛电子仪器有限公司 | Protection circuit for leakage current tester |
| CN102074927A (en) * | 2010-12-13 | 2011-05-25 | 南京民盛电子仪器有限公司 | Earth leakage protection circuit of withstand voltage tester |
| CN102253256A (en) * | 2011-04-19 | 2011-11-23 | 深圳茂硕电源科技股份有限公司 | High-power power supply load meter |
| CN202110224U (en) * | 2011-04-23 | 2012-01-11 | 上海电气输配电试验中心有限公司 | Joint voltage experiment tester |
| CN102545143A (en) * | 2010-12-13 | 2012-07-04 | 华为技术有限公司 | Device and method for detection and protection and circuit board |
| US20120242249A1 (en) * | 2011-03-22 | 2012-09-27 | Green Solution Technology Co., Ltd. | Controller and LED driving circuit with protection function |
| CN103280771A (en) * | 2013-06-13 | 2013-09-04 | 成都联腾动力控制技术有限公司 | Motor controller overcurrent judgment and protection circuit |
| CN108169566A (en) * | 2017-12-29 | 2018-06-15 | 江苏海湾电气科技有限公司 | Online testing impedance circuit and method |
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2019
- 2019-05-21 CN CN201910421920.3A patent/CN111983271A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB925027A (en) * | 1959-09-01 | 1963-05-01 | Siemens & Iialske Ag | A protective circuit arrangement for transistors |
| SU384100A1 (en) * | 1971-03-01 | 1973-05-23 | DC VOLTAGE STABILIZER WITH PROTECTION DEVICE | |
| EP0331251A2 (en) * | 1988-03-02 | 1989-09-06 | I.R.E. Industrie Riunite Eurodomestici S.p.A. | Overvoltage protection device for control circuits using power transistors |
| CN1372720A (en) * | 1999-09-03 | 2002-10-02 | 默勒有限公司 | Circuit arrangement for the overvoltage protection of a power transistor for controlling an inductive load |
| CN1432815A (en) * | 2002-01-18 | 2003-07-30 | 刘英彰 | Electronic load simulator with tested current loop impedance |
| CN201449402U (en) * | 2009-07-03 | 2010-05-05 | 南京民盛电子仪器有限公司 | Protection circuit for leakage current tester |
| CN102074927A (en) * | 2010-12-13 | 2011-05-25 | 南京民盛电子仪器有限公司 | Earth leakage protection circuit of withstand voltage tester |
| CN102545143A (en) * | 2010-12-13 | 2012-07-04 | 华为技术有限公司 | Device and method for detection and protection and circuit board |
| US20120242249A1 (en) * | 2011-03-22 | 2012-09-27 | Green Solution Technology Co., Ltd. | Controller and LED driving circuit with protection function |
| CN102253256A (en) * | 2011-04-19 | 2011-11-23 | 深圳茂硕电源科技股份有限公司 | High-power power supply load meter |
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| CN103280771A (en) * | 2013-06-13 | 2013-09-04 | 成都联腾动力控制技术有限公司 | Motor controller overcurrent judgment and protection circuit |
| CN108169566A (en) * | 2017-12-29 | 2018-06-15 | 江苏海湾电气科技有限公司 | Online testing impedance circuit and method |
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