Abstract: An electronic ballast circuit for discharge lamps, comprising a boosting transformer for applying a high voltage as a discharging voltage to the discharging lamps, the high voltage being induced in a main secondary winding of the transformer according to forward and reverse currents flowing through a primary winding of the transformer, a charging section for charging a voltage from an input power source terminal, first and second switching sections for repeatedly performing switching operations contrary to each other, a resonance section for allowing the forward current to flow through the primary winding of the boosting transformer when the first switching section conducts and allowing the reverse current to flow through the primary winding of the boosting transformer when the second switching section conducts, and a plurality of condensers, each connected between the secondary winding of the boosting transformer and a filament of a corresponding one of the discharge lamps, the condensers limiting amounts of

Abstract: An electronic ballast circuit for discharge lamps, comprising a power factor enhancing and noise removing circuit for enhancing a power factor of an input AC voltage and removing a noise component therefrom, a rectification circuit for full wave-rectifying and smoothing an output voltage from the power factor enhancing and noise removing circuit to output a DC voltage, a drive voltage supply circuit having a primary winding of a first transformer for limiting current, the drive voltage supply circuit receiving the DC voltage from the rectification circuit, limiting an amount of current to a second transformer and supplying an initial drive voltage to an inverter, the second transformer driving the discharge lamps, a base driving circuit having a secondary winding of the first transformer, the base driving circuit supplying a voltage induced in a third winding of the second transformer and a current induced in the secondary winding of the first transformer as base drive voltage and current to the inverter, and

Abstract: An automatic conveying system of a car safety belt that controls various alarm functions and directions of a motor for releasing and fastening of the belt with an electronic controller constituted in such that a control unit scans switch states according to key inputs, and drives an alarm lamp, an alarm buzzer, an alarm chime, a solenoid and a driving motor. The control method provides the users of a car safety belt with convenience, and also solves problems of the prior relay-type control system such as high cost, largely occupied space and difficulty in checking when in trouble.

Abstract: A driving control apparatus for an electric range having a function of self-diagnosis by detecting a temperature within an oven with a voltage, detecting the present temperature within an oven by comparing the detected temperature with reference voltages according to each step, controlling precisely the temperature within the oven by the present temperature with an established temperature and determining automatically the state of a hardware for outputting the reference voltages at the time of detecting the present temperature. The apparatus can precisely control the temperature within the oven, and in case of an abnormal condition of a hardware, it stops the operation of heater and indicates the error, thereby the reliability and safety of the product can be enhanced.

Abstract: A ground fault detecting circuit and trip mechanism for sensing ground fault signals and for interrupting a protection circuit. The trip mechanism includes a cross bar connected by means a pin to a pushbutton. A trip cross bar is rotatably assembled to the frame and engages the cross bar. When a ground fault is detected, a solenoid rotates the trip cross bar to release the cross bar. Two springs connecting the pin for retaining the cross bar pull the pushbutton and cross bar away from the trip cross bar to thereby free a pair of contacts to open the circuit. Subsequently, the trip mechanism can be reset by properly pushing the button to force the cross bar to engage the trip cross bar against the elastic pull of the springs.