Driving apparatus and method for dimmable led
AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.
InventorsAnle HU, Xiang YANG, Hua ZHANG
Life of this patent
Estimating the term…
Abstract
A driving apparatus and method for a dimmable LED is provided. The apparatus includes a dimmer switch which controls connection or disconnection of an LED series. The apparatus further includes: a boost circuit electrically coupled to the LED series; a comparator electrically coupled to the boost circuit, the comparator receiving a triangle wave signal to generate a PWM signal, the PWM signal controlling the boost circuit; and a RC circuit electrically coupled to the comparator, the RC circuit utilized to output a charging curve signal to the comparator when the dimmer switch disconnects, thereby improving noise and electromagnetic interference of the boost circuit.
Claims15
A dimmable light-emitting diode (LED) driving apparatus comprising a dimmer switch, which controls connection or disconnection of an LED series, the dimmable LED driving apparatus further comprising:
- a boost circuit electrically coupled to the LED series;
- a comparator electrically coupled to the boost circuit, the comparator receiving a triangle wave signal to generate a Pulse Width Modulation (PWM) signal, the PWM signal controlling the boost circuit;
- a resistor-capacitor (RC) circuit electrically coupled to the comparator, the RC circuit utilized to output a charging curve signal to the comparator for the comparator generating the PWM signal with diminishing duty cycles when the dimmer switch disconnects;
- and
- a switching circuit utilized to turn on a connection between the RC circuit and the comparator when the dimmer switch disconnects, so that the comparator receives the charging curve signal.
A dimmable LED driving apparatus comprising a dimmer switch, which controls connection or disconnection of an LED series, the dimmable LED driving apparatus further comprising:
- a boost circuit electrically coupled to the LED series;
- a comparator electrically coupled to the boost circuit, the comparator receiving a triangle wave signal to generate a PWM signal, the PWM signal controlling the boost circuit;
- and
- a RC circuit electrically coupled to the comparator, the RC circuit utilized to output a charging curve signal to the comparator when the dimmer switch disconnects.
A method for driving a dimmable LED, comprising a step of:
- outputting a charging curve signal to a comparator for the comparator generating a PWM signal with diminishing duty cycles when a dimmer switch disconnects an LED series.
Dependencies are inferred from the claim text.