JPH0423096U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a characteristic diagram of the above filter yoke, Fig. 3 is a waveform diagram for explaining the operation of the above, Fig. 4 is a circuit diagram of a conventional example,
FIG. 5 is a waveform diagram for explaining the operation of the same as above, and FIG. 6 is a configuration diagram of another conventional example. la is a lamp, C ₁ and C ₄ are capacitors, L ₁
is a filter yoke, _Q4 is a triax, is a lighting circuit, and is a dimmer.

Claims (1)

[Scope of utility model registration request] A lighting circuit that rectifies commercial power and then converts it to a high frequency using an inverter to light an incandescent lamp. A dimmer that is inserted between the lighting circuit and a commercial power source that controls the phase of the commercial power input to the lighting circuit to dim the light. In an incandescent lamp lighting device consisting of a first capacitor connected in parallel to a power supply path, a filter tie yoke connected in series to this power supply route, and a first capacitor connected in parallel to the power supply route via this filter tie yoke, A π-type filter circuit consisting of a connected second capacitor is provided on the power input side of the lighting circuit, and the capacitance value of the first capacitor closer to the dimmer is smaller than the capacitance value of the second capacitor, An incandescent lamp lighting device characterized in that the values of the first capacitor and the first capacitor are set so that the oscillating current generated by the first capacitor and the first capacitor built into the dimmer does not have a negative amplitude. .