| 摘要 |
A driver circuit and driving method of an LED lighting device are provided. A driver circuit includes an AC power supply, a dimmer, a transformer, and a dimming control circuit. The dimming control circuit includes a filtering unit, a rectifying unit, a boost converter unit, a voltage feedback control circuit unit, a control-signal conversion unit, and a buck converter unit. A dimming position of the dimmer is defined at point P1. The control-signal conversion unit is introduced to automatically adjust a voltage signal at point P1 into an amount of a current required by the buck converter unit to dynamically balance an input power and an output power such that no flashing or dimming failure phenomena occur to the LED lighting device. When the dimmer is rotated, the voltage of point P1 can change. By control-signal conversion unit, corresponding analog dimming signal is outputted to the buck control unit to alter an amount of current of the buck control unit outputted to the LED lighting device. |
