Patent ID: 8049428
Filing Date: 2011-11-01
Classification: H05B

Abstract:
1. A uni-directional light emitting diode drive circuit in pulsed power series resonance, wherein capacitive or inductive impedance components in series connection are provided with a pulsed power input, wherein divided power in series resonance across the two ends of the capacitive impedance component or of the inductive impedance component is rectified by a rectifier device to the DC power output, thereby to drive the uni-directional conducting light emitting diode set to emit light; wherein the uni-directional light emitting diode drive circuit in pulsed power series resonance, in which the circuit function and operation of the uni-directional light emitting diode drive circuit (U the two ends of the first impedance and the second impedance in series connection are provided for inputting: 1) DC pulsed power; or 2) DC pulsed power with constant or variable voltage and constant or variable periods converted from DC power source; or 3) DC pulsed power with constant or variable voltage and constant or variable periods converted from DC power which is further rectified from AC power; or 4) half-wave or full-wave DC pulsed power rectified from AC power with constant or variable voltage and constant or variable frequency; in addition, it is installed with at least one rectifier device, wherein its AC input ends are provided to receive a bi-directional divided power input in series connection across the two ends of at least one impedance of the first impedance (Z the uni-directional conducting light emitting diode set which includes at least one light emitting diodes is driven by the DC power output across the positive and negative ends of a rectifier device; the bi-directional divided power in series resonance of the first and second impedances is rectified by the rectifier device to drive at least one uni-directional conducting light emitting diode or is rectified by the two or more than two rectifier devices which are respectively parallel connected across the two ends of the first and second impedances to provide DC power output to drive the individual uni-directional conducting light emitting diode; wherein: the DC pulsed power; or the DC pulsed power with constant or variable voltage and constant or variable periods converted from DC power source; or the DC pulsed power with constant or variable voltage and constant or variable periods converted from DC power which is further rectified from AC power; or the half-wave or full-wave DC pulsed power rectified from AC power with constant or variable voltage and constant or variable frequency; the inherent series resonance of the first impedance component (Z the rectifier device (BR the rectifier device can include a bridge type rectifier device or by a half-wave rectifier device, wherein the number of rectifier device (BR the uni-directional conducting light emitting diode set (L the uni-directional conducting light emitting diode set (L one or more than one first impedance (Z the bi-directional divided power produced by the first impedance or second impedance in series resonance is rectified by a rectifier device to DC power and is used to drive at least one uni-directional conducting light emitting diode, or the AC powers of the first impedance and of the second impedance are respectively rectified by the two rectifier devices which are respectively parallel connected across the two ends of the first impedance and second impedance to DC powers and are used to drive the individual uni-directional conducting light emitting diodes, thereby to constitute the uni-directional light emitting diode drive circuit in pulsed power series resonance; said first impedance (Z