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1. (WO2017156891) ALTERNATING CURRENT DRIVING MIXED DIMMING CIRCUIT AND TELEVISION

Pub. No.:    WO/2017/156891    International Application No.:    PCT/CN2016/084866
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Sun Jun 05 01:59:59 CEST 2016
IPC: H05B 33/08
Applicants: SHENZHEN TCL DIGITAL TECHNOLOGY LTD.
深圳TCL数字技术有限公司
Inventors: WANG, Jian
王坚
Title: ALTERNATING CURRENT DRIVING MIXED DIMMING CIRCUIT AND TELEVISION
Abstract:
An alternating current driving mixed dimming circuit and a television. The alternating current driving mixed dimming circuit comprises a transformer (10), a PWM control module (20), a driving voltage output module (30), a current sampling module (40), an auxiliary voltage output module (50), a voltage and current monitoring module (60), a signal isolation module (70), an analogue dimming control module (80) and a digital dimming control module (90). A primary side and a secondary side of the transformer (10) are isolated by the signal isolation module (70), and a light bar driving voltage and a light bar current are monitored by the voltage and current monitoring module (60), so as to achieve constant current output and overvoltage protection; analogue dimming is achieved by means of the analogue dimming control module (80) and the current sampling module (40); and digital dimming is achieved by means of the digital dimming control module (90), the current sampling module (40) and the PWM control module (20). In this way, analogue and digital mixed dimming of a light bar is achieved, and the alternating current driving efficiency is improved.