Title:
【発明の名称】所定の限度外気温度に達した際に自動遮断機能が働く減光可能高力率高周波電子安定器制御集積回路
Document Type and Number:
Japanese Patent JPH06508475
Kind Code:
A
Abstract:
An embodiment of the present invention is a dimmable, high power factor, high efficiency electronic ballast comprising, on a single integrated circuit chip, a shunt regulator, a voltage reference, a high-temperature shutdown, an undervoltage lockout, a timer for start-up and restarting, a variable oscillator, a mode control, an op-amp for receiving a signal proportional to lamp current and for controlling the variable oscillator or the duty-cycle of pulses output in a closed-loop servo, and active power factor correction including an analog multiplier for receiving an AC voltage and an AC current sample, and for multiplying these together to result in a comparison with a DC voltage. The comparison produces a control signal for a MOSFET switch on a boost converter transformer that actively corrects the power factor at a rate set by the oscillator.
Inventors:
Rethy, Ronald A
Application Number:
JP50173294A
Publication Date:
September 22, 1994
Filing Date:
June 09, 1993
Export Citation:
Assignee:
Electronic Writing Incorporated
International Classes:
H02M7/06; H02M1/00; H02M1/42; H02M7/12; H02M7/217; H05B41/24; H05B41/28; H05B41/282; H05B41/40; (IPC1-7): H05B41/29; H02M7/06; H02M7/217; H05B41/24; H05B41/40
Attorney, Agent or Firm:
Kunihiko Ohashi (1 outside)