Anti-interference and adjustable dual-channel leakage protector

A leakage protector and dual-channel technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, instruments, etc., can solve problems such as potential safety hazards, achieve strong consistency and reduce difficulty

Active Publication Date: 2019-09-10
温州市新林微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is a certain security risk

Method used

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  • Anti-interference and adjustable dual-channel leakage protector
  • Anti-interference and adjustable dual-channel leakage protector
  • Anti-interference and adjustable dual-channel leakage protector

Examples

Experimental program
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Embodiment Construction

[0022] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:

[0023] see figure 1 , is a schematic diagram of the circuit structure of the leakage protection circuit of the present invention, including a power supply voltage stabilization circuit (1), a first channel reference circuit (2), a first channel leakage signal detector (4), a second channel reference circuit (3), The second channel leakage signal detector (5), the anti-jamming module circuit (8, 9, 10, 11), the logic processor (6) and the latch output circuit (7).

[0024] The power supply voltage stabilizing circuit (1), which clamps the external voltage near the typical value of the operating voltage of the leakage protection circuit;

[0025] the power supply regulator circuit (1), see figure 2 : Transistor Q1 is a power switch tube that provides bias voltage for the internal circuit. The bias voltage is determined by the resistor R19 and the voltage r...

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PUM

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Abstract

The invention relates to an anti-jamming trimmable two-channel leakage current protector. The circuit includes a power supply voltage regulating circuit, a first channel reference circuit, a first channel leakage signal detector, a second channel reference circuit, a second channel leakage signal detector, an anti-interference module circuit, a logic processor and a latch output circuit. The invention has three characteristics: firstly, the circuit has strong anti-interference characteristics; secondly, a trimming circuit is arranged for the leakage current detection point of the trimming circuit; thirdly, an independent two-channel leakage protection setting is adopted, and the two channels have strong consistency. This makes the leakage protection circuit in the design more in line withthe actual leakage protection requirements.

Description

technical field [0001] The invention relates to the field of leakage protection, in particular to a leakage protection circuit with anti-interference characteristics. Background technique [0002] After years of development and popularization and application, leakage protectors have formed a series of products with a considerable scale in terms of varieties and specifications. It plays an important role in the safety protection of the low-voltage power grid. The anti-interference ability of leakage protectors commonly used at present is relatively poor. The main reason is that the zero-sequence transformer used in the leakage protector is easily interfered by high-frequency electromagnetic wave signals, which generate a large interference signal at the input end of the leakage protector. Leakage protectors are prone to misoperation when receiving secondary interference signals. [0003] At the same time, the accuracy requirements for the leakage current monitoring points ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/32H02H3/00G01R31/02
CPCG01R31/50H02H3/006H02H3/32
Inventor 吴明芬田自娟
Owner 温州市新林微电子有限公司
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