Electric power conversion systems – Current conversion – Using semiconductor-type converter
Reexamination Certificate
2005-01-27
2009-10-06
Fureman, Jared J (Department: 4154)
Electric power conversion systems
Current conversion
Using semiconductor-type converter
C363S097000, C363S098000, C363S132000
Reexamination Certificate
active
07599202
ABSTRACT:
An inverter controls the power supplied to a load such as a CCFL connected to a secondary winding of a transformer by means of pulse width modulation (PWM) control of the switches of a semiconductor switching circuit connected to the primary winding of the transformer. The current and voltage supplied to the load are fed back to the inverter in the form of a current error signal and a voltage error signal, respectively, from which a feedback signal is formed in accordance with the magnitudes of these signals. Thus, when the DC supply voltage of a DC power supply sharply rises, the inverter changes the feedback signal directly, that is, without waiting for the changes to occur in the load current and load voltage, so as to reduce the power supplied to the load. Thus, over-current and resultant viewer's discomfort is suppressed. Sudden shut down of the inverter are also prevented from occurring.
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International Search Report issued in the corresponding International Application No. PCT/JP2005/001557, mailed May 17, 2005.
Fureman Jared J
Hernandez Manuel
Keating & Bennett LLP
Rohm & Co., Ltd.
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