LED LIGHTING APPARATUS

摘要

When an LED lighting apparatus which is a lighter load than an incandescent lamp or halogen lamp is connected to a dimmer, a malfunction may occur. The invention prevents the occurrence of such malfunction without defeating the purpose of low power consumption of the LED lighting apparatus. More specifically, the LED lighting apparatus includes a rectifier circuit, a light-emitting circuit connected to the rectifier circuit and containing a single or a plurality of LEDs in which current begins to flow when an output voltage of the rectifier circuit exceeds a threshold voltage, and a bypass circuit having a bypass path for making the current flow to the rectifier circuit without passing through the light-emitting circuit, and a detecting unit for detecting the current flowing through the light-emitting circuit, and wherein when the current detected by the detecting unit exceeds a predetermined value, the bypass circuit shuts off the current flowing through the bypass path.

主权项

1. An LED lighting apparatus comprising:
a rectifier circuit; a first light-emitting circuit connected to said rectifier circuit and containing a single or a plurality of LEDs in which current begins to flow when an output voltage of said rectifier circuit exceeds a threshold voltage; a first bypass circuit having a bypass path for making the current flow to said rectifier circuit without passing through said first light-emitting circuit, and a detecting unit for detecting the current flowing through said first light-emitting circuit, a second bypass circuit connected to said first light-emitting circuit; a second light-emitting circuit connected to said second bypass circuit and containing a single or a plurality of LEDs in which current begins to flow when the output voltage of said rectifier circuit exceeds a threshold voltage; and a current limiting circuit for limiting the current flowing into said second light-emitting circuit, wherein when the current detected by said detecting unit exceeds a predetermined value, said first bypass circuit shuts off the current flowing through said bypass path.