Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1995-05-26
1997-12-09
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 41, 315DIG7, H02M 3335, H02M 112, H05B 4116
Patent
active
056966709
ABSTRACT:
The power supply, well suited for powering a metal halide lamp, includes a rectifier with an AC input and a DC output. A power transformer has its primary winding connected to the DC output and its secondary winding connected to the lamp. A pulse-width-modulated (PWM) controller is coupled to the primary winding for controlling the flow of power therethrough. A smoothing circuit is connected to the lamp for reducing the rate of change of the current flowing through the lamp. Avoiding filtering of the rectifier output, maintaining a constant pulse width of the PWM controller throughout the period of the AC input power and filtering switching-frequency current components from the input to the rectifier provides a sinusoidal input current to the power supply which is substantially in phase with the input voltage. Such supply has a power factor of over 99%.
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Neal Norman D.
Roederer David A.
Vu Bao Q.
Webster Heating and Specialty Products, Inc.
Wong Peter S.
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