Input detecting circuit used for electric-leakage protection devices with self-diagnostic function
AssigneeShanghai Fudan Microelectronics Co., Ltd.
InventorsJun Yu, Qikang Chen
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Abstract
An input detecting circuit for an electric-leakage protection device with self-diagnostic function includes an analog electric-leakage unit, a magnetic electric-leakage induction ring, an operational amplifier, and an inverse feedback circuit. The inverse feedback circuit includes a first resistance and a second circuit unit shunted with the first resistance. The second circuit unit includes a second resistance and a unidirectional break-over unit connected in series with the second resistance.
Claims2
An input detecting circuit for an electric-leakage protection device with self-diagnostic function, comprising:
- an emulation electric-leakage unit,
- a magnetic leakage current detecting ring,
- an amplifying circuit, and
- a negative feedback circuit;
- wherein:
- one end of said negative feedback circuit is connected with an input end of a negative terminal of said amplifying circuit, and the other end is connected with an output end of said amplifying circuit;
- said negative feedback circuit contains a first resistance and a second circuit unit parallel with said first resistance;
- said second circuit unit contains a second resistance and a unidirectional conductive unit connected in series with the second resistance;
- said conductive unit contains at least one unidirectional conductive element.
Dependencies are inferred from the claim text.