Patent ID: 7276862
Filing Date: 2007-10-02
Classification: H05B,Y10S

Abstract:
1. An electronic stabilizer for a high-voltage discharge lamp, comprising: a rectifying unit for converting an AC voltage to a DC voltage through full-wave rectification; a power factor correction (PFC) circuit for controlling a power factor of the DC voltage output from the rectifying unit; a booster for boosting the voltage having the power factor controlled by the PFC circuit; a buck converter for converting the DC voltage boosted by the booster to a modified DC voltage; a commutator for controlling the DC voltage output from the buck converter to provide constant current; an igniter for receiving the voltage output from the commutator to generate a high voltage, wherein the high-voltage discharge lamp is turned on by the high voltage generated by the igniter; a current detector for detecting current in response to the high-voltage discharge lamp being turned on and the high voltage being fed back from the igniter; a voltage detector for detecting the voltage output from the buck converter; an igniter voltage controller for receiving the voltage output from the igniter and controlling the voltage so that the voltage is not applied to the igniter when abnormality in the high-voltage discharge lamp occurs; a watchdog timer for comparing the detected voltage with a preset reference voltage to output a signal for sensing whether there is abnormality in the high voltage at set time intervals; and a current and voltage error sensor for receiving the current from the current detector, the voltage from the voltage detector, and a signal for sensing whether there is abnormality in the high voltage output from the watchdog timer, to thereby sense abnormality in the voltage applied to the high-voltage discharge lamp; and a dimmmg circuit connected between the voltage detector and a ground for automatically adjusting the voltage depending on ambient illuminated light and temperature.