LED lighting device and lighting equipment

摘要

An LED lighting device including a DC power source circuit, a high frequency generation circuit which includes an inverter circuit having switching elements and a resonance circuit having a series-connected inductor and condenser, in which the switching elements are on-off controlled by a no-load resonance frequency of the resonance circuit, and DC voltage input from the DC power source circuit is converted into a high frequency AC voltage, a rectification smoothing circuit having an input side which is connected between both edges of the condenser or both edges of the inductor; and a light emitting diode series connected to an output side of the rectification smoothing circuit.

主权项

1. An LED lighting device comprising:
a DC power source circuit; a high frequency generation circuit including an inverter circuit having a switching element and a resonance circuit having a series-connected inductor and condenser, in which the switching element is on-off controlled by a frequency within a predetermined frequency range and DC voltage input from the DC power source circuit is converted into a high frequency AC voltage, the predetermined frequency range including a no-load resonance frequency of the resonance circuit; a rectification smoothing circuit having an input side which is parallelly connected to the condenser or inductor so that the input high frequency AC voltage is rectified and smoothed for output; a light emitting diode series connected to an output side of the rectification smoothing circuit; and a protection circuit performing a protecting operation for a case where the light emitting diode is damaged.