Patent ID: 7973497
Filing Date: 2011-07-05
Classification: H05B

Abstract:
1. A discharge tube lighting apparatus comprising: a converter arranged to convert a power supply voltage received from an alternating-current power supply or a direct-current power supply into a direct-current voltage; and an inverter arranged to perform a switching operation at a switching frequency, to convert an output voltage of the converter into an alternating-current voltage, and to output the alternating-current voltage to a discharge tube; wherein the inverter includes a switching circuit arranged to perform the switching operation with a substantially constant on-duty ratio and a burst control circuit arranged to perform burst control in which active and inactive states are repeated at a frequency that is less than the switching frequency and to control a ratio between an active period and an inactive period of the burst based on an externally input control signal; and the converter is arranged to operate regardless of the active or inactive state of the burst control in the inverter and includes a negative feedback control circuit arranged to stabilize a voltage or a current of the discharge tube in response to a detection signal of the voltage or the current of the discharge tube; the discharge tube lighting apparatus further comprising: