Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2005-11-22
2005-11-22
Vu, David (Department: 2828)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S224000, C315S308000
Reexamination Certificate
active
06967449
ABSTRACT:
The present invention relates to a discharge lamp lighting apparatus in which overshoot occurring when the polarity of AC rectangular wave voltage/current is inverted is suppressed. An inverter converts DC power supplied by a converter to AC rectangular wave power and outputs the AC rectangular wave power. A power calculation unit generates a power detection signal based upon a voltage detection signal and a current detection signal detected on the output side of the converter. A control target value setting unit outputs an output power command value to be used to control the DC power so as to achieve a target value. A correction signal generation unit outputs a correction signal to be used to correct the output power command value in conformance to the power detection signal in synchronization with a polarity inversion of the AC rectangular wave power. A converter control signal generation unit outputs a signal corresponding to the error of the power detection signal relative to the output power command value. A pulse width control unit implements pulse width control on the converter based upon the signal provided by the converter control signal generation unit.
REFERENCES:
patent: 5142203 (1992-08-01), Oda et al.
patent: 5465029 (1995-11-01), Hanazaki et al.
patent: 3-116693 (1991-05-01), None
Ishihara Yutaka
Takeya Akiko
Yamashima Masayuki
TDK Corporation
Vu David
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