Dimmer interface circuit and buffer stage circuit therein

• Main Authors: QIU RENLIAN, ZHANG YUWEN, CHEN YAOZHOU
• Format: Patent
• Language: Chinese; English
• Published: 23.07.2021
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

The invention relates to a dimmer interface circuit and a buffer stage circuit therein. The dimmer interface circuit includes a buffer stage circuit and a pulse width modulation control circuit. The buffer stage circuit is used for converting a dimming input signal into a dimming buffer signal. The buffer stage circuit includes a power rail generation circuit configured to adaptively generate a power rail according to a dimming input signal such that the dimming input signal is between a high voltage and a low voltage of the power rail, and an amplifying circuit used for receiving a dimming input signal and generating a dimming buffer signal. The power rail is used for supplying power to the amplifying circuit, and the amplifying circuit is completely operated between a high voltage and a low voltage. The pulse width modulation control circuit is coupled with the buffer stage circuit and is used for converting the dimming buffer signal into a pulse width modulation dimming signal so as to adjust the brightnes