Patent ID: 6285138
Filing Date: 2001-09-04
Classification: H05B,Y10S

Abstract:
A fluorescent lamp lighting apparatus comprising:a DC-voltage generation circuit for generating a DC voltage;a drive-signal generation circuit for generating and outputting desired high-voltage-side and low-voltage-side pulse signals by using the DC voltage from said DC-voltage generation circuit; anda drive control circuit having switching means driven by the pulse signals input from said drive-signal generation circuit to output a drive signal across the output terminals thereof, wherein a resonance circuit and the filament electrodes of a fluorescent lamp light-emitting tube are connected across the output tenninals of said switching means, andsaid drive-signal generation circuit having:a timer circuit in which the output signal thereof is altered after a predetermined time from power on;a separate-excitation oscillator for outputting a signal having a predetermined frequency;a separate-excitation/self-excitation selection switch circuit for outputting one of two input signals depending on the output signal of said timer circuit;a trigger input circuit for detecting the resonance frequency of said resonance circuit;a high voltage-side pulse generation circuit having a high-voltage-side dead time generation circuit, a narrow pulse generation circuit, a level shift circuit, a pulse reproduction circuit and an output circuit;a low-voltage-side pulse generation circuit having a low-voltage-side dead time generation circuit and an output circuit; andan under-voltage lockout circuit for outputting an output signal when the voltage of the power source is a predetermined voltage or less at the time of the rising and falling of the power source.