Patent ID: 8054007
Filing Date: 2011-11-08
Classification: H05B

Abstract:
1. A bi-directional light emitting diode drive circuit in bi-directional power series resonance, which uses capacitive impedance component to be a first impedance and inductive impedance component to be a second impedance, wherein the inherent series resonance frequency of the first impedance and the second impedance in series connection is the same as the frequency of the bi-directional AC power source, or the alternated polarity period of the constant or variable voltage converted from a DC power and the constant or variable periodically alternated polarity power, thereby to produce a series resonance status; wherein in series resonance, a bi-directional divided power in series resonance is formed across the two ends of the capacitive impedance component or the inductive impedance component for driving at least one bi-directional conducting light emitting diode which is parallel connected across the two ends of the first impedance or the second impedance to emit light; a bi-directional light emitting diode drive circuit (U 1) AC power with a constant or variable voltage and a constant or variable frequency; or 2) 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 the DC power source; or 3) 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 the AC power; the bi-directional divided power in series resonance formed at the first impedance or the second impedance in series resonance is used to drive the at least one bi-directional conducting light emitting diode set which is parallel connected across the two ends of either the first impedance or the second impedance, or at least two bi-directional conducting light emitting diodes which are respectively parallel connected across the two ends of the first impedance and the second impedance to be respectively driven by the divided power across the two ends of the first impedance and the two ends of the second impedance, thereby to constitute the bi-directional light emitting diode drive circuit in bi-directional power series resonance of the present invention; comprising: the first impedance (Z the bi-directional conducting light emitting diode set (L the bi-directional divided power in series resonance formed at the first impedance or the second impedance in series resonance by means of above said powers to drive at least one bi-directional conducting light emitting diode set which is parallel connected across the two ends of either the first impedance or the second impedance, or to drive at least two bi-directional conducting light emitting diode sets which are respectively parallel connected across the two ends of the first impedance and the second impedance, thereby to constitute the bi-directional light emitting diode drive circuit in bi-directional power series resonance of the present invention; the bi-directional light emitting diode drive circuit in bi-directional power series resonance of the present invention, in which the first impedance (Z the first impedance (Z