JPS6033794U - dimming lighting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional example, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the same operation. 1 is a power supply circuit, 2 is a power synchronization signal generation circuit, 3 is a phase control unit, 4 is a 1-chip microprocessor, 5 is a commercial power supply, 6 is an incandescent lamp load, 7 is a waveform shaping circuit, and 8 is a monostable multivibrator. , PT is a pulse transformer.

Claims (1)

[Scope of utility model registration request] A bidirectional thyristor with a control pole that is interposed in series between a commercial power source and a lighting load, a power supply circuit that receives the voltage across the bidirectional thyristor as input, and outputs a DC power supply voltage; A power synchronization signal generation circuit is connected between both ends of the thyristor and generates a synchronization signal consisting of a zero-crossing signal of a commercial AC voltage; A 1-chip microprocessor for phase control that continues to output a phase control signal until the synchronization signal of the next half cycle is input from the corner, and a 1-chip microprocessor for phase control that is triggered when the output of the phase control signal starts and starts from an AC half cycle. A waveform shaping circuit that generates an output pulse of a sufficiently short predetermined width, and a pulse transformer that is energized during the pulse output period of the waveform shaping circuit and applies a trigger pulse to the control pole of the bidirectional thyristor. Dimmable lighting device.