Patent ID: 8063587
Filing Date: 2011-11-22
Classification: H05B

Abstract:
1. A bi-directional light emitting diode drive circuit in bi-directional power parallel resonance, in which the bi-directional light emitting diode drive circuit (U 100 ) includes at least one capacitive impedance component, or inductive impedance component or resistive impedance component to constitute at least one first impedance; at least one capacitive impedance component and at least one inductive impedance component are in parallel connection to constitute a second impedance, wherein the inherent parallel resonance frequency of the second impedance is the same as the frequency or period of the bi-directional power, thereby to produce a parallel resonance status; the first impedance and the second impedance are in mutual series connection to receive the following bi-directional powers which includes the following: 1) the AC power with a constant or variable voltage and a constant or variable frequency; or 2) the AC power of bi-directional sinusoidal wave voltage or bi-directional square wave voltage, or bi-directional pulse wave voltage with constant or variable voltage and constant or variable frequency or period which is converted from a DC power source; or 3) the AC power of bi-directional sinusoidal wave voltage or bi-directional square wave voltage, or bi-directional pulse wave voltage with constant or variable voltage and constant or variable frequency or period converted from the DC power which is further rectified from an AC power; wherein a bi-directional conducting light emitting diode set (L the bi-directional conducting light emitting diode set (L wherein: the first impedance (Z 1) the first impedance (Z 2) the first impedance (Z 3) the first impedance (Z the second impedance (Z at least one inductive impedance component (I at least one of the three kinds of the capacitive impedance components, inductive impedance components or resistive impedance components is configured to be selected as needed to constitute the first impedance (Z the first impedance (Z 1) the AC power with a constant or variable voltage and a constant or variable frequency; or 2) the AC power of bi-directional sinusoidal wave voltage or bi-directional square wave voltage, or bi-directional pulse wave voltage with constant or variable voltage and constant or variable frequency or period which is converted from a DC power source; or 3) the AC power of bi-directional sinusoidal wave voltage or bi-directional square wave voltage, or bi-directional pulse wave voltage with constant or variable voltage and constant or variable frequency or period converted from the DC power which is further rectified from an AC power; a bi-directional conducting light emitting diode set (L at least one set of the bi-directional conducting light emitting diode set (L the bi-directional light emitting diode drive circuit (U the first impedance (Z