A low-power anti-interference type A leakage protector

Abstract

The invention discloses a low-power-consumption anti-interference A-type electric leakage protector. The leakage protector comprises a ring oscillator, a power-on reset module, a chopping zero-stabilizing operational amplifier, a reference voltage generation module, an interference filtering module, a threshold comparison module, an electric leakage waveform judgment module and a tripping signal pulse width modulation module, wherein the ring oscillator is used for generating a modulation signal and a clock signal required by an amplifier; the power-on reset module provides a global reset signal; the chopping zero-stabilizing operational amplifier is used for amplifying an electric leakage signal; the reference voltage generation module is used for generating a threshold level of the electric leakage signal; the interference filtering module is used for filtering a pulse interference signal in the electric leakage signal and triggering the threshold comparison module; the threshold comparison module is used for judging whether the electric leakage signal reaches a tripping threshold value; the electric leakage waveform judgment module is used for judging the type of the electric leakage signal; and the tripping signal pulse width modulation module is used for adjusting a pulse width of the tripping signal. The interference filtering module and the electric leakage waveform judgment module can effectively prevent misoperation of the A-type electric leakage protector. Output of the interference filtering module is used as a wake-up signal of the threshold comparison module sothat static power consumption of a chip can be effectively reduced, and a market prospect is good.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to an A-type leakage protector for leakage protection. Background technique [0002] With the advancement of science and technology and the continuous development of the economy, people's living standards have been greatly improved, and the accompanying electrical equipment tends to be larger and more complex, such as large charging piles, energy-saving equipment, etc. Introduced a large number of non-sinusoidal AC residual current. The traditional AC type residual current protector can only protect against AC leakage, but cannot protect against DC pulsation. [0003] The A-type leakage protector not only protects AC leakage, but also protects DC pulsating leakage. Therefore, the protection of type A leakage protector is more comprehensive and reliable than that of AC type leakage protector. [0004] CN 104300494A discloses an A-type leakage protector with the same leakag...

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Problems solved by technology

[0004] CN 104300494A discloses an A-type leakage protector with the same leakage trip current value. The chip judges the leakage signal by judging the time range of the overshoot value detected by the mutual induction coil. However, due to the difference in the overshoot value induced by different mutual induction coils The amplitude and the time range of appearance are different. Therefore, this chip has poor adaptability to different mutual induction coils and has the problem of large static power consumption.

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