CN203259574U - DC high-voltage detection circuit with high impedance input - Google Patents
DC high-voltage detection circuit with high impedance input Download PDFInfo
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- CN203259574U CN203259574U CN 201320210455 CN201320210455U CN203259574U CN 203259574 U CN203259574 U CN 203259574U CN 201320210455 CN201320210455 CN 201320210455 CN 201320210455 U CN201320210455 U CN 201320210455U CN 203259574 U CN203259574 U CN 203259574U
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Abstract
The utility model provides a DC high-voltage detection circuit with high impedance input, which has the following advantages: high input impedance, and high-precision voltage detection. The DC high-voltage detection circuit comprises the following components: a first-stage operational amplifier circuit, a second-stage operational amplifier circuit, a third-stage operational amplifier circuit, an optocoupler and a fourth-stage operational amplifier circuit; wherein the components are successively connected. The first-stage operational amplifier circuit, the second-stage operational amplifier circuit, the third-stage operational amplifier circuit and the fourth-stage operational amplifier circuit are respectively a first-stage voltage follower, a second-stage voltage follower, a third-stage voltage follower and a fourth-stage voltage follower. The DC high-voltage detection circuit with high impedance input according to the utility model utilizes a linear optical coupler for realizing insulation between low voltage and high voltage. In signal detection, the operational amplifier circuits are used for forming the voltage followers and buffering, thereby forming high impedance input and low impedance output and supplying good signals for back-end signal acquisition.
Description
Technical field
The utility model relates to a kind of high-voltage detecting circuit, especially a kind of direct-current high voltage detection circuit of high impedance input.
Background technology
Often use the Hall voltage sensor to carry out isolation detection for the detection of the above high direct voltage of 1000V, but high performance voltage sensor cost is higher.The high-voltage detecting circuit of high impedance input adopts resistance sampling, operation amplifier, isolation to amplify, and realizes the electrical isolation of high-pressure side and monitoring sampled point road low-pressure side.The words signal of single use electric resistance partial pressure is without isolation, and influential without surge protection to follow-up A/D conversion, the output impedance of simultaneously many high pressure is high, no matter directly tests or buffering test, all can be influential.Increasing operational amplifier and isolated amplifier can play isolation buffer, reduce output impedance and guarantee simultaneously the functions such as electrical isolation.
The at present detection of voltage signal mainly contains electric resistance partial pressure, linear optical coupling, voltage transformer (VT) and four kinds of methods of Hall voltage sensor.Voltage transformer (VT) generally can only for detection of alternating voltage, not be suitable for high direct voltage and detect; The Hall voltage sensor carries out the advantages such as voltage detecting has precision height, linear good, bandwidth, response is fast, overload capacity is strong, but cost is higher; If use merely electric resistance partial pressure also can obtain the low-voltage that ratio is dwindled, but its precision is subjected to external environment (mainly being temperature) impact large, and the output impedance height causes harmful effect to follow-up A/D conversion equipment.The high input voltage side is added surge and EMC protection.
The utility model content
The direct-current high voltage detection circuit that the high impedance that the utility model provides a kind of high input impedance, high-accuracy voltage to detect is inputted.
Realize the direct-current high voltage detection circuit of a kind of high impedance input of the utility model purpose, comprise one-level discharge circuit, secondary discharge circuit, three grades of discharge circuits, optical coupling isolator and level Four discharge circuits of linking to each other successively; Described one-level discharge circuit, secondary discharge circuit, three grades of discharge circuits and level Four discharge circuit are respectively one-level voltage follower, secondary voltage follower, tertiary voltage follower and level Four voltage follower.
The beneficial effect of the direct-current high voltage detection circuit of a kind of high impedance input of the present utility model is as follows:
The direct-current high voltage detection circuit of a kind of high impedance input of the present utility model uses linear optocoupler, reaches the isolation of low pressure and high pressure; Detection signal uses amplifier to consist of voltage follow, has reached buffering, forms high impedance input, Low ESR output, for the back end signal collection provides good signal.
Description of drawings
Fig. 1 is the structural representation of the direct-current high voltage detection circuit of a kind of high impedance input of the present utility model.
Embodiment
As shown in Figure 1, the direct-current high voltage detection circuit of a kind of high impedance input of the present utility model comprises one-level discharge circuit 1, secondary discharge circuit 2, three grades of discharge circuits 3, optical coupling isolator 4 and level Four discharge circuits 5 of linking to each other successively; Described one-level discharge circuit 1, secondary discharge circuit 2, three grades of discharge circuits 3 and level Four discharge circuit 5 are respectively one-level voltage follower, secondary voltage follower, tertiary voltage follower and level Four voltage follower.
The principle of work of the direct-current high voltage detection circuit of a kind of high impedance input of the present utility model is as follows:
The one-level discharge circuit is done the one-level voltage follower circuit, plays isolation buffer and reduces the effect of output impedance; Secondary discharge circuit, three grades of discharge circuits the and optical coupling isolator consist of signal condition and electrical isolation circuit, guarantee the electrical isolation of power supply ground and the earth, therefore be connected connection on the electrical equipment with control loop by electric loop behind the photoelectrical coupler, select simultaneously high-operational amplifier to improve precision and the linearity of testing circuit; The level Four discharge circuit improves operational precision again, suppresses common-mode signal.
Embodiment recited above is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; design under the spiritual prerequisite not breaking away from the utility model; various distortion and improvement that the common engineering technical personnel in this area make technical solutions of the utility model all should fall in the definite protection domain of claims of the present utility model.
Claims (1)
1. the direct-current high voltage detection circuit of a high impedance input is characterized in that: comprise one-level discharge circuit, secondary discharge circuit, three grades of discharge circuits, optical coupling isolator and level Four discharge circuits of linking to each other successively; Described one-level discharge circuit, secondary discharge circuit, three grades of discharge circuits and level Four discharge circuit are respectively one-level voltage follower, secondary voltage follower, tertiary voltage follower and level Four voltage follower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320210455 CN203259574U (en) | 2013-04-24 | 2013-04-24 | DC high-voltage detection circuit with high impedance input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320210455 CN203259574U (en) | 2013-04-24 | 2013-04-24 | DC high-voltage detection circuit with high impedance input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203259574U true CN203259574U (en) | 2013-10-30 |
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ID=49472125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320210455 Expired - Lifetime CN203259574U (en) | 2013-04-24 | 2013-04-24 | DC high-voltage detection circuit with high impedance input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203259574U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809003A (en) * | 2014-01-20 | 2014-05-21 | 河南科技大学 | Isolator for testing signal voltage waveforms |
-
2013
- 2013-04-24 CN CN 201320210455 patent/CN203259574U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809003A (en) * | 2014-01-20 | 2014-05-21 | 河南科技大学 | Isolator for testing signal voltage waveforms |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 5088, block B, Spark Road, Fengtai District Science City, Beijing,, China, 11 Patentee after: CCE OASIS TECHNOLOGY Corp. Address before: Room 5088, block B, Spark Road, Fengtai District Science City, Beijing,, China, 11 Patentee before: Cecep Oasis (Beijing) solar energy technology Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20131030 |
|
| CX01 | Expiry of patent term |