| 摘要 |
<p>A ballast device in power saving and voltage regulation, comprises bridge rectifier circuit, electrolytic capacitor filter, half-bridge converter circuit, and LC output circuit in electrical series connection. The ballast device further comprises electromagnetic compatible (EMC) filter circuit for restraining the resonance wave current of high frequency from impacting the power network, power factor correction circuit with source for improving power factor, reducing resonance wave, realizing constant power output, abnormal state protect circuit for preventing the ballast device from damage in the abnormal state. The electromagnetic compatible (EMC) filter circuit is connected between the input end of voltage and bridge rectifier circuit. The power factor correction circuit with source is connected between the bridge rectifier circuit and electrolytic capacitor filter. The abnormal state protect circuit is set in the half-bridge converter circuit. The ballast device could resist instantaneous peak impulse and thunder interfere, restrain burst current, have multiple load output, delay startup, and prolong the life.</p> |
