Patent ID: 11895751
Assignee: JOULWATT TECHNOLOGY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A leakage protection circuit comprising two input terminals for receiving an external signal, wherein the leakage protection circuit comprises:
a leakage detection circuit, wherein the leakage detection circuit is connected between the two input terminals and detects whether a leakage phenomenon exists between the two input terminals when a detection path of the leakage detection circuit is turned on; and
a control circuit, wherein the control circuit receives a sampling signal characterizing a voltage between the two input terminals, the control circuit is configured to compare the sampling signal with a first threshold and a second threshold within a power frequency period, and the control circuit controls whether the detection path is turned on according to a comparison result;
wherein when the leakage phenomenon is detected between the two input terminals, the control circuit controls a load to be in a non-working state,
wherein the control circuit comprises a pulse generation circuit, wherein
the pulse generation circuit is configured to obtain a first comparison signal according to a comparison between the sampling signal and the first threshold and obtain a second comparison signal according to a comparison between the sampling signal and the second threshold; and
a first pulse signal is obtained according to the first comparison signal, and a second pulse signal is obtained according to the second comparison signal; and the first pulse signal and the second pulse signal are configured to control whether the detection path is turned on or off.