Leakage protection circuit and dimming drive circuit

• Main Authors: HE WANYUE, LIU GUOQIANG
• Format: Patent
• Language: Chinese; English
• Published: 10.06.2022
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

The invention discloses an electric leakage protection circuit and a dimming driving circuit, an electric leakage detection circuit is used for detecting whether electric leakage occurs between two input ends for receiving external signals, when electric leakage occurs, an electric leakage protection measure is taken, a pulse generation circuit receives a sampling signal representing voltage between the two input ends, and the pulse generation circuit outputs the sampling signal to the dimming driving circuit. And the sampling signal is compared with the two threshold values, so that whether the detection path of the electric leakage detection circuit is conducted or not is controlled according to the comparison result. According to the scheme of the utility model, two pulse signals are set in one power frequency period, so that an electric leakage detection path can be conducted twice, electric leakage detection of a driving circuit with front-cut dimming and rear-cut dimming of a silicon controlled rectifie