Lg Industrial Systems Co., Ltd.

Goldstar Instrument & Electric Co., Ltd.

Bog Youn Kang

Sang Kyu Lee

Byung R Yang

Kyung H Lee

Eun T Jung

Ki J Im

Chang H Kim

Hong K Yoo

A stabilizer casing for a fluorescent light fixture includes an open lower case, a printed circuit board mounted in the open lower case, a connector connected to a portion of the printed circuit board and having connection terminals, and a cap connected to the open lower case so that the connection terminals of the connector are exposed externally at one end of the cap. The stabilizer can be easily automated and cost reduction can be accomplished accordingly due to the simplified production steps.

Ballast casing for fluorescent lamp

An apparatus and a method for transmitting a dimming control signal in an up/down encoding manner. A dimming control value and a number of a desired electronic ballast group are set by the user and then encoded into binary data in the up/down manner. The encoded binary data is set as transmission data. A receiving stage receives the transmission data and performs a dimming control operation on the basis of dimming up/down information and electronic ballast group number up/down information of the received data.

Apparatus and method for transmitting foward/receiving dimming control

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 discharging currents to the discharge lamps.

Discharge lamp ballast operating on induced voltage in the primary

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 a current control circuit for stabilizing a current induced in the second transformer and then supplied to the discharge lamps, the inverter driving the second transformer in response to the voltages from the rectification circuit and the base driving circuit.

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Cheongju, South Korea

Bog Youn Kang