Plasma body display screen over current detection device

Abstract

An apparatus for detecting lowering of at least first and second output voltages from a driving apparatus of a plasma display panel below corresponding regular voltages due to over current in the plasma display panel and generating an output control signal to be transmitted to the driving apparatus, includes a switching transistor having a collector to which a bias voltage is applied, an emitter which is grounded, and a base, the switching transistor being operated according to the level of a voltage applied to the base and generating the output control signal through the collector. A voltage signal generating portion is connected between the base of the switching transistor and a port of the first output voltage, and the base and a port of the second output voltage, respectively, for changing a bias voltage of the base as the first and second output voltages change. A switching support portion is connected between the emitter of the switching transistor and at least one of the first and second output ports, so that a lowered voltage is applied to the emitter when at least one of the first and second output voltages is lower than a corresponding regular voltage, to prevent incorrect operation of the switching transistor.

Description

technical field [0001] The present invention relates to a plasma display panel overcurrent detection device, and more particularly to a method for detecting that at least first and second output voltages of a plasma display panel driver gradually drop below corresponding normal voltages due to plasma display overcurrent The situation and generate an output control signal sent to the detection device of the driver. Background technique [0002] FIG. 1 shows an overcurrent detection device of a general plasma display screen. Referring to FIG. 1, the first output voltage Vo1 of the first input port 11 is input to the negative input port (one) of the first comparator Co1, and the level of the first output voltage Vo1 is dropped by resistors R101, R102, R103 and R104. When the input first output voltage Vo1 is lower than the first reference voltage Vref1 , the first comparator Co1 generates a high-state output control signal, indicating that an overcurrent flows in the plasma di...

AI Technical Summary

Problems solved by technology

[0005] First, due to the long propagation delay time of each comparator Co1 and Co2, the overcurrent flowing in the plasma panel cannot be quickly detected

[0006] Secondly, since the output voltages Vo1 and Vo2 are detected separately, it is not suitable for plasma display screens with various driving voltage levels.

[0007] Third, since the reference voltages Vref1 and Vref2 of the comparators Co1 and Co2 are accurately generated, the circuit structure of the detection device is relatively complicated

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