Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
2011-07-12
2011-07-12
Sterrett, Jeffrey L (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C363S086000
Reexamination Certificate
active
07978485
ABSTRACT:
A thyristor power control circuit reduces EMI and maintains a holding current in the thyristor to prevent flickering at a load. The power control circuit includes a thyristor configured to receive an input AC voltage, and responsive to a gate pulse generates a modified AC voltage. A rectifier receives the modified AC voltage and generates a rectified DC voltage. A power converter coupled to the rectifier receives the rectified DC voltage and generates a controlled output current. A damping circuit coupled to an output terminal of the rectifier includes a damping resistor for maintaining the holding current in the thyristor during an ON period of the thyristor. The damping circuit includes a first capacitor coupled in series to the damping resistor and a diode coupled in parallel to the damping resistor. The diode enables the first capacitor to discharge without causing power loss at the damping resistor.
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Bothra Vipin
Stamm Thomas
Wong Vee Shing
Jorgenson Lisa K.
Sterrett Jeffrey L
STMicroelectronics Inc.
Szuwalski Andre M.
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