Patent ID: 7309962

Claim:
A protection control circuit for discharge lamps to control protection signals input to a load at a rear end of a high voltage output zone that are generated during abnormal conditions, the high voltage output zone comprising a power supply unit to provide power supply input, a control unit to provide a first voltage distribution signal, a driving unit to receive the power supply and the first voltage distribution signal and transform voltage, a voltage boosting unit to receive the transformed voltage and transform to a high voltage, and the load connecting to a high voltage output end of the voltage boosting unit, wherein: the driving unit includes a plurality of driving devices, the voltage boosting unit and the load being connected to the driving devices and including respectively a plurality of transformers and discharge lamps, the high voltage output zone between the control unit and the driving unit being bridged by a switch device to receive the first voltage distribution signal and output a plurality of second voltage distribution signals corresponding to the driving devices, each of the driving devices being connected to a high voltage output zone line of the discharge lamps that feeds back individually a protection signal to the switch device, the switch device determining one of a first electricity condition and a second electricity condition of each high voltage output zone line of the discharge lamps that is connected to the individual driving device; and wherein the switch device is electrically connected to a switch which inputs a plurality of switch signals to the switch device corresponding to the number of the driving devices.