CN203720235U - Current detecting circuit used for high voltage DC power source - Google Patents
Current detecting circuit used for high voltage DC power source Download PDFInfo
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- CN203720235U CN203720235U CN201320880363.XU CN201320880363U CN203720235U CN 203720235 U CN203720235 U CN 203720235U CN 201320880363 U CN201320880363 U CN 201320880363U CN 203720235 U CN203720235 U CN 203720235U
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- testing circuit
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- 238000005070 sampling Methods 0.000 claims abstract description 19
- 230000001052 transient effect Effects 0.000 claims description 13
- 230000001419 dependent effect Effects 0.000 claims description 12
- 230000001629 suppression Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000001914 filtration Methods 0.000 abstract description 4
- 230000003321 amplification Effects 0.000 abstract description 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000001012 protector Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model is suitable for the field of high voltage DC current detection and provides a current detecting circuit used for a high voltage DC power source. The detecting circuit includes a sampling unit, an overvoltage protection unit and a filtering unit. The input terminal of the sampling unit is connected with a high voltage rectification unit. The output terminal of the sampling unit is connected with the input terminal of the overvoltage protection unit. The input terminal of the filtering unit is connected with the output terminal of the sampling unit. The output terminal of the overvoltage protection unit and the output terminal of the filtering unit are connected to a reverse amplification circuit. By adding overvoltage protection devices in the detecting circuit, power output is stabilized; failure protection is guaranteed; product service lifetime is prolonged; product quality is improved; detection precision is enhanced; and anti-interference capability is improved.
Description
Technical field
The utility model belongs to current detecting field, relates in particular to a kind of testing circuit of high-voltage DC power supply electric current.
Background technology
In electrostatic dust collection equipment product, its power stage range of control is large, and current detection accuracy is had relatively high expectations, and general current detection circuit can not meet the demands, and causes power stage unstable, emergency protection inefficacy etc.
Utility model content
The utility model provides a kind of testing circuit of high-voltage DC power supply electric current, is intended to solve general current detection circuit and causes the problem that power stage is unstable, emergency protection lost efficacy.
The utility model is to realize like this; a kind of testing circuit of high-voltage DC power supply electric current; this testing circuit comprises sampling unit, Overvoltage protecting unit and filter unit; described sampling unit input end connects high-voltage rectifying unit; described sampling unit output terminal connects described Overvoltage protecting unit input end; described filter unit input end connects described sampling unit output terminal, and described Overvoltage protecting unit, filter unit output terminal connect reverse amplifying unit.
Further technical scheme of the present utility model is: described Overvoltage protecting unit comprises voltage dependent resistor (VDR) VR1 and Transient Suppression Diode TVS1, described voltage dependent resistor (VDR) VS1 Transient Suppression Diode TVS1 in parallel.
Further technical scheme of the present utility model is: described filter unit comprises resistance R 2 and capacitor C 1, described resistance R 2 shunt capacitance C1.
Further technical scheme of the present utility model is: described sampling unit comprises resistance R 1.
Further technical scheme of the present utility model is: the resistance of described resistance R 1 is 1K ~ 20K.
Further technical scheme of the present utility model is: the charge capacity of described capacitor C 1 is 10 ~ 100 nF.
Further technical scheme of the present utility model is: the magnitude of voltage of described voltage dependent resistor (VDR) VR1 is 27V ~ 47V.
Further technical scheme of the present utility model is: the magnitude of voltage of described Transient Suppression Diode TVS1 is 22V ~ 33V.
The beneficial effects of the utility model are: by increase over-voltage protector in testing circuit, make that power stage is stable, emergency protection is normal, increase product serviceable life, improve the quality of products, accuracy of detection is high, antijamming capability is strong.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the testing circuit of the high-voltage DC power supply electric current that provides of the utility model embodiment;
Fig. 2 is the circuit diagram of the testing circuit of the high-voltage DC power supply electric current that provides of the utility model embodiment.
Embodiment
Fig. 1,2 shows the testing circuit of the high-voltage DC power supply electric current that the utility model provides; this testing circuit comprises sampling unit, Overvoltage protecting unit and filter unit; described sampling unit input end connects high-voltage rectifying unit; described sampling unit output terminal connects described Overvoltage protecting unit input end; described filter unit input end connects described sampling unit output terminal, and described Overvoltage protecting unit, filter unit output terminal connect reverse amplification circuit.By increase over-voltage protector in testing circuit, make that power stage is stable, emergency protection is normal, increase product serviceable life, improve the quality of products, accuracy of detection is high, antijamming capability is strong.
Described Overvoltage protecting unit comprises voltage dependent resistor (VDR) VR1 and Transient Suppression Diode TVS1, described voltage dependent resistor (VDR) VS1 Transient Suppression Diode TVS1 in parallel.Voltage dependent resistor (VDR) VR1 utilizes non-linear volt-ampere characteristic when circuit bears overvoltage, to carry out voltage clamping, absorbs unnecessary electric current with protection Sensitive Apparatus.When Transient Suppression Diode TVS1 is subject to reverse transient state high energy impact events at the two poles of the earth; it can be with 10 the speed of bearing 12 power second-times; the high impedance of its two interpolar is become to Low ESR; the surge power of absorption up to thousands of watts; make the voltage clamp of two interpolars in a predetermined value; effectively protect the precision components in electronic circuit, avoid the damage of various surge pulses.
Described filter unit comprises resistance R 2 and capacitor C 1, described resistance R 2 shunt capacitance C1.RC filtering circuit is the alternating component in the DC voltage that reduces as far as possible to pulse, and retains its flip-flop, and output voltage ripple coefficient is reduced, and it is smoother that waveform becomes.
Described sampling unit comprises resistance R 1.
Described high-voltage rectifying unit comprises resistance R V1.
Described reverse amplifying unit comprises operational amplifier V1B, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7 and capacitor C 2, power supply VCC connects described resistance R 5, described resistance R 5 is through described resistance R 6 ground connection, described resistance R 5 connects described operational amplifier V1B positive input terminal through described resistance R 7, described operational amplifier V1B positive supply connects power supply VCC, described operational amplifier V1B negative supply ground connection, described operational amplifier V1B output terminal connects AD_CUR, described resistance R 3 connects described operational amplifier V1B negative input end, the described operational amplifier negative input end of the described resistance R 4 series connection rear parallel connection of described capacitor C 2 is in parallel to output terminal.
Resistance R V1 one end connects High voltage output terminal LN1, and the other end is contact resistance R1, voltage dependent resistor (VDR) VR1 respectively, voltage dependent resistor (VDR) VR1 ground connection, and wherein the magnitude of voltage of voltage dependent resistor (VDR) is 27V ~ 47V, resistance R 1 other end connects respectively Transient Suppression Diode TVS1, resistance R 2, one end and resistance R 3 one end after capacitor C 1 is in parallel, Transient Suppression Diode TVS1, resistance R 2, other end ground connection after capacitor C 1 is in parallel, resistance R 3 other end concatenation operation amplifier V1B negative input ends, resistance R 5 is through resistance R 6 ground connection, resistance R 5 is through resistance R 7 concatenation operation amplifier V1B positive input terminals, operational amplifier V1B positive supply connects power supply VCC, operational amplifier V1B negative supply ground connection, operational amplifier V1B output terminal connects AD_CUR, after resistance R 4 series capacitance C2, operational amplifier negative input end in parallel is in parallel to output terminal.The charge capacity of described capacitor C 1 is 10 ~ 100 nF.The resistance of described resistance R 1 is 1K ~ 20K.The magnitude of voltage of described Transient Suppression Diode TVS1 is 22V ~ 33V.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (8)
1. the testing circuit of a high-voltage DC power supply electric current; it is characterized in that: this testing circuit comprises sampling unit, Overvoltage protecting unit and filter unit; described sampling unit input end connects high-voltage rectifying unit; described sampling unit output terminal connects described Overvoltage protecting unit input end; described filter unit input end connects described sampling unit output terminal, and described Overvoltage protecting unit, filter unit output terminal connect reverse amplifying unit.
2. testing circuit according to claim 1, is characterized in that: described Overvoltage protecting unit comprises voltage dependent resistor (VDR) VR1 and Transient Suppression Diode TVS1, described voltage dependent resistor (VDR) VS1 Transient Suppression Diode TVS1 in parallel.
3. testing circuit according to claim 1 and 2, is characterized in that: described filter unit comprises resistance R 2 and capacitor C 1, described resistance R 2 shunt capacitance C1.
4. testing circuit according to claim 3, is characterized in that: described sampling unit comprises resistance R 1.
5. testing circuit according to claim 4, is characterized in that: the resistance of described resistance R 1 is 1K ~ 20K.
6. testing circuit according to claim 3, is characterized in that: the charge capacity of described capacitor C 1 is 10 ~ 100 nF.
7. testing circuit according to claim 2, is characterized in that: the magnitude of voltage of described voltage dependent resistor (VDR) VR1 is 27V ~ 47V.
8. testing circuit according to claim 7, is characterized in that: the magnitude of voltage of described Transient Suppression Diode TVS1 is 22V ~ 33V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320880363.XU CN203720235U (en) | 2013-12-30 | 2013-12-30 | Current detecting circuit used for high voltage DC power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320880363.XU CN203720235U (en) | 2013-12-30 | 2013-12-30 | Current detecting circuit used for high voltage DC power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203720235U true CN203720235U (en) | 2014-07-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320880363.XU Expired - Lifetime CN203720235U (en) | 2013-12-30 | 2013-12-30 | Current detecting circuit used for high voltage DC power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203720235U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589296A (en) * | 2017-10-23 | 2018-01-16 | 宁德时代新能源科技股份有限公司 | Signal acquisition device, detector, battery device and delivery vehicle of high-voltage loop |
| CN107703409A (en) * | 2017-10-23 | 2018-02-16 | 华中科技大学 | A kind of current measurement circuit for insulating core transformer typ high voltage power supply |
-
2013
- 2013-12-30 CN CN201320880363.XU patent/CN203720235U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589296A (en) * | 2017-10-23 | 2018-01-16 | 宁德时代新能源科技股份有限公司 | Signal acquisition device, detector, battery device and delivery vehicle of high-voltage loop |
| CN107703409A (en) * | 2017-10-23 | 2018-02-16 | 华中科技大学 | A kind of current measurement circuit for insulating core transformer typ high voltage power supply |
| CN107703409B (en) * | 2017-10-23 | 2024-02-09 | 华中科技大学 | Current measurement circuit for insulating core transformer type high-voltage power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Nanshan District Xili street Shahe road 518000 Shenzhen City, Guangdong province No. 3151 emerging industrial park building A 404-1 Patentee after: SHENZHEN ZHENBANG TECHNOLOGY CO.,LTD. Address before: 518000, Guangdong, Nanshan District, Taoyuan street, Longjing second industrial zone, A building, 2 floor, A building, 3 building, north, B building, 3 floor, B building, 6 floor, building C, building 3, Shenzhen Patentee before: SHENZHEN ZHENBANG INTELLIGENT TECHNOLOGY Co.,Ltd. Address after: 518000, Guangdong, Nanshan District, Taoyuan street, Longjing second industrial zone, A building, 2 floor, A building, 3 building, north, B building, 3 floor, B building, 6 floor, building C, building 3, Shenzhen Patentee after: SHENZHEN ZHENBANG INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Xili Longjing second industrial zone A building 3 floor, B building 3 floor, C building 3 floor Patentee before: SHENZHEN ZHENBANG INDUSTRY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140716 |