H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/282 (2006.01) H02P 6/18 (2006.01) H05B 41/29 (1990.01)
Patent
CA 2103627
ABSTRACT OF THE DISCLOSURE The present invention relates to a variable frequency electronic ballast of high power-factor and stabilized output- voltage which is used for fluorescent lamps and other gas discharge lamps. A rectifying circuit changes input AC power voltage to full-wave rectified pulsating DC voltage. A voltage-controlled oscillator is used to produce a high- frequency signal and the variation of the frequency is based on the pulsating DC voltage. The high-frequency signal is amplified in the driving circuit to drive an electronic switch. The electronic switch inverts the pulsating DC voltage into a variable high-frequency square-wave voltage, but this voltage still pulsates with the pulsating DC voltage. Then the variable high-frequency square-wave voltage passes through a resonant circuit to become a constant-amplitude wave voltage and supplies a constant power to lamp. Because the system can operate in the condition of variable voltage, the rectifying circuit does not need a big volume filter capacitor, the distortion of input current waveform is decreased, and the power-factor is increased. Moreover, the power at the lamp is a constant value when input voltage changes, therefore the system has an equivalent stabilized output-voltage.
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