Title:
LIGHTING DEVICE
Document Type and Number:
Japanese Patent JP3378117
Kind Code:
B2
Abstract:
PURPOSE: To light a lamp such as an incandescent lamp by converting a commercial power supply voltage into a high frequency.
CONSTITUTION: A lighting device is composed of a dimming circuit 2 which phase-controls a commercial power supply voltage by a phase control element Q4, and a lighting circuit 1 which rectifies the output of the dimming circuit 2 by a rectifier Re so as to convert it into a high frequency by a half bridge type transistor inverter to feed electricity to an incandescent lamp LP. The lighting circuit 1 is equipped with a starting circuit S which starts the transistor inverter when the phase control element Q4 is turned on. The starting circuit S is equipped with a resistor 3 which adjusts an input current to a trigger element Q3, a capacitor C3 which is charged through the resistor R3 at every half wave of the power supply, and the trigger element Q3 which is turned on by the charge voltage of the capacitor C3. In order to shorten the charge time of the capacitor C3 when the phase control element Q4 is turned on, a series circuit of a resistor R7 of a small resistant value and a DC cutting capacitor C6 is provided in parallel to the resistor R3.
Inventors:
Hidetoshi Tsuji
Takahiro Michiie
Tadashi Akashi
Takahiro Michiie
Tadashi Akashi
Application Number:
JP9307495A
Publication Date:
February 17, 2003
Filing Date:
March 27, 1995
Export Citation:
Assignee:
Totou Equipment Co., Ltd.
Tokyo Trans Co., Ltd.
Tokyo Trans Co., Ltd.
International Classes:
H05B41/24; H05B39/04; (IPC1-7): H05B39/04; H05B41/24
Domestic Patent References:
| JP6129097A |
Attorney, Agent or Firm:
Teruyuki Uemura (1 person outside)
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