Piezoelectric resonator light-emitting-diode (LED) driving circuit

摘要

A piezoelectric resonant LED driving circuit, wherein a rectifier is used to rectify an AC voltage provided by the supply main into a DC voltage. Then, a quasi-resonant switching module performs resonance by means of the DC voltage to produce an induced current, to raise resonance frequency to operation frequency of a piezoelectric oscillator. Finally, the piezoelectric oscillator performs resonance and filtering using the induced current, to generate a sine wave current. Then, the sine wave current is rectified to output a DC current to drive an LED module.

主权项

1. A piezoelectric resonant LED driving circuit, comprising:
a rectifier, used to receive an AC voltage, to rectify it into a DC voltage; a quasi-resonant switching module, connected to said rectifier, and includes an inductor, a capacitor, and a switch, said switch and said capacitor connected in parallel, and then said switch and said capacitor are connected to said inductor, to perform resonance using said DC voltage, to generate an induced current; a piezoelectric oscillator, connected to said quasi-resonant switching module, to receive said induced current, and produce a sine wave current after resonating and filtering said induced current; and an LED module, connected to said piezoelectric oscillator to receive said sine wave current, and rectify said sine wave current into a DC current to drive said LED module.