CN220139224U - Leakage protection circuit with noise filtering function - Google Patents
Leakage protection circuit with noise filtering function Download PDFInfo
- Publication number
- CN220139224U CN220139224U CN202320350690.8U CN202320350690U CN220139224U CN 220139224 U CN220139224 U CN 220139224U CN 202320350690 U CN202320350690 U CN 202320350690U CN 220139224 U CN220139224 U CN 220139224U
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- China
- Prior art keywords
- circuit
- protection circuit
- leakage protection
- power supply
- leakage
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- 238000001914 filtration Methods 0.000 title claims abstract description 27
- 238000012544 monitoring process Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Filters And Equalizers (AREA)
Abstract
The utility model provides a leakage protection circuit with noise filtering, which comprises a leakage protection circuit, wherein the input end of the leakage protection circuit is connected with the noise filtering circuit in series and then connected with a power supply, and the output end of the leakage protection circuit is connected with electric equipment. If the electric equipment has electric leakage, the differential signal generated in the power line is directly monitored by the electric leakage protection circuit, so that the action of cutting off the power supply can be timely performed, the influence of the work of the noise filtering circuit is avoided, the misoperation can be avoided, and the response time of the electric leakage protection circuit can be prolonged.
Description
Technical Field
The utility model relates to a power supply protection circuit, in particular to a leakage protection circuit with noise filtering.
Background
In order to ensure the electricity safety of the electric equipment, an electric leakage monitoring and protecting circuit is generally required to be arranged. Once the electric equipment leaks electricity, the power supply can be cut off through the electricity leakage monitoring protection circuit in time, so that the electric shock danger possibly occurring to a user is prevented. Meanwhile, because different electric equipment can generate high-frequency signals and the like when in work, such as a high-frequency switch power supply and the like, the high-frequency signals can be fed back through a power line to be connected with a power line, and the interference and the like to other electric equipment can be possibly generated, and therefore a noise filter circuit is required to be arranged at the power input end of the electric equipment. In the conventional circuit design, a noise filter circuit is usually disposed at the rear end of the leakage protection circuit, and since elements such as a capacitor or an inductor are usually disposed in the noise filter circuit, the elements can filter or delay differential signals generated by the power line due to leakage, and can also generate false differential signals due to actions such as charging and discharging generated in the noise filter circuit, thereby affecting the working sensitivity, response time or false triggering of the leakage protection circuit.
Disclosure of Invention
The utility model aims to provide a leakage protection circuit with noise filtering, which improves the reliability of the whole circuit by adjusting the arrangement of the noise filtering circuit and the leakage protection circuit.
The utility model is realized by the following technical scheme:
the leakage protection circuit with the noise filtering function comprises a leakage protection circuit, wherein the input end of the leakage protection circuit is connected with the noise filtering circuit in series and then connected with a power supply, and the output end of the leakage protection circuit is connected with electric equipment.
Preferably, the leakage protection circuit comprises a mutual inductance sampling circuit, a leakage monitoring chip and a peripheral circuit thereof; the mutual inductance sampling circuit is a current transformer and a filter circuit, a power supply line at the output end of the noise filter circuit passes through the current transformer in parallel, and the coil output end of the current transformer is connected with the filter circuit and then connected to the differential signal input end of the leakage monitoring chip; the power supply circuit of the output end of the noise filtering circuit is connected in series with a relay and then output to electric equipment, and the attraction coil of the relay is connected to the control output end of the leakage monitoring chip.
Preferably, the noise filter circuit comprises two groups, and each group of noise filter circuit comprises two groups of series resistors and a capacitor connected in series with the input end of the power supply.
Preferably, the type of the leakage monitoring chip is NC37020.
Compared with the prior art, the utility model has the beneficial effects that: if the electric equipment has electric leakage, the differential signal generated in the power line is directly monitored by the electric leakage protection circuit, so that the action of cutting off the power supply can be timely performed, the influence of the work of the noise filtering circuit is avoided, the misoperation can be avoided, and the response time of the electric leakage protection circuit can be prolonged.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present utility model, the technology in the embodiments is described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic circuit diagram of a first use state of the present utility model.
Description of the embodiments
Referring to fig. 1, the leakage protection circuit with noise filtering includes a leakage protection circuit, wherein an input end of the leakage protection circuit is connected with the noise filtering circuit in series and then connected with a power supply, and an output end of the leakage protection circuit is connected with electric equipment. If the electric equipment has electric leakage, the differential signal generated in the power line is directly monitored by the electric leakage protection circuit, so that the action of cutting off the power supply can be timely performed, the influence of the work of the noise filtering circuit is avoided, the misoperation can be avoided, and the response time of the electric leakage protection circuit can be prolonged.
The leakage protection circuit comprises a mutual inductance sampling circuit, a leakage monitoring chip and a peripheral circuit thereof. The peripheral circuits include a power supply circuit, an output driving circuit, a status display circuit, and the like. The power supply circuit is connected to a power supply, and generates corresponding direct current through the rectifier bridge, the filter circuit and the like to supply power for the leakage monitoring chip and the like. Because the coil of the relay needs a larger working current when working, the output end of the electric leakage detection chip can not provide enough driving current, so that an output driving circuit comprising a silicon controlled rectifier and a peripheral circuit is needed to be added, and the coil of the relay is connected to the output driving circuit. And a state display circuit and the like, wherein when electric leakage or abnormality occurs, the output signal of the corresponding port of the electric leakage monitoring chip drives the LED to emit light so as to inform a user of timely treatment. The mutual inductance sampling circuit is a current transformer and a filter circuit. The power supply circuit at the output end of the noise filtering circuit passes through the current transformer in parallel, and the coil output end of the current transformer is connected with the filtering circuit and then connected to the differential signal input end of the leakage monitoring chip; the power supply circuit of the output end of the noise filtering circuit is connected in series with a relay and then output to electric equipment, and the attraction coil of the relay is connected to the control output end of the leakage monitoring chip. The leakage monitoring chip adopts an application specific integrated circuit with the model NC37020.
In addition, the noise filtering circuit comprises two groups, each group of noise filtering circuit comprises two groups of series resistors and a capacitor which are connected in series at the input end of the power supply, and the noise filtering circuit is used for filtering high-frequency noise signals generated by electric equipment so as to prevent the high-frequency noise signals from being coupled to the power supply circuit to influence the work of other electric equipment.
Claims (3)
1. Take noise filtration's earth leakage protection circuit, its characterized in that: the power supply comprises a leakage protection circuit, wherein the input end of the leakage protection circuit is connected with a noise filtering circuit in series and then connected with a power supply, and the output end of the leakage protection circuit is connected with electric equipment; the leakage protection circuit comprises a mutual inductance sampling circuit, a leakage monitoring chip and a peripheral circuit thereof; the mutual inductance sampling circuit is a current transformer and a filter circuit, a power supply line at the output end of the noise filter circuit passes through the current transformer in parallel, and the coil output end of the current transformer is connected with the filter circuit and then connected to the differential signal input end of the leakage monitoring chip; the power supply circuit of the output end of the noise filtering circuit is connected in series with a relay and then output to electric equipment, and the attraction coil of the relay is connected to the control output end of the leakage monitoring chip.
2. The leakage protection circuit with noise filtering according to claim 1, wherein: the noise filter circuit comprises two groups, and each group of noise filter circuit comprises two groups of series resistors and a capacitor which are connected in series at the input end of the power supply.
3. The leakage protection circuit with noise filtering according to claim 1, wherein: the model of the electric leakage monitoring chip is NC37020.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320350690.8U CN220139224U (en) | 2023-03-01 | 2023-03-01 | Leakage protection circuit with noise filtering function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320350690.8U CN220139224U (en) | 2023-03-01 | 2023-03-01 | Leakage protection circuit with noise filtering function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220139224U true CN220139224U (en) | 2023-12-05 |
Family
ID=88958159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320350690.8U Active CN220139224U (en) | 2023-03-01 | 2023-03-01 | Leakage protection circuit with noise filtering function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220139224U (en) |
-
2023
- 2023-03-01 CN CN202320350690.8U patent/CN220139224U/en active Active
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