Samsung Electro-mechanics Co., Ltd.

Ju Rae Kim

Ho Young Kim

Jong Rak Kim

Min Jin Kim

Jung Won Hwang

In Wha Jeong

Hugh Wook Kim

Jun Boum Lim

Sung Cheol Kim

Kyu Tae Seo

Jeong Won Yun

Sook Gyu Min

A power supplying apparatus includes a first piezoelectric transformer operated at a first operating frequency, a second piezoelectric transformer operated alternately with the first piezoelectric transformer and operated at a second operating frequency, wherein the second operating frequency is a multiple of the first operating frequency.

Power supplying apparatus with piezoelectric transformers

A portable terminal according to the present disclosure may include an information display part including a display screen displaying information and a battery; and a band part fastened to the information display part, wherein the band part includes a charging coil wirelessly receiving power to transfer the power to the battery.

Portable terminal, wireless charging device, and wireless charging structure thereof

A lamp driving circuit includes a first printed circuit board and a second printed circuit board. The first printed circuit board includes a switching unit for switching an input power source, a control unit for controlling the switching unit, an inverter transformer connected to the switching unit, and a voltage conversion unit for converting a feedback reference current for controlling an output current applied from the inverter transformer into a reference voltage and applying the reference voltage to the control unit. The voltage conversion unit is connected to the inverter transformer and the control unit. The voltage conversion unit is connected to a first feedback terminal. The second printed circuit board includes a plurality of balance coils connected to a plurality of lamps so that the same output currents are applied to the lamps, a second feedback terminal connected to the first feedback terminal, and a current conversion unit connected to the second feedback terminal.

Lamp driving circuit

The present invention provides a connector including: a printed circuit board including a guide hole and a locking hole; a plurality of connection pads provided on a top surface of the printed circuit board; a housing which is mounted on the printed circuit board and including a guide inserted into the guide hole and a locking unit inserted into the locking hole, which are protrudingly formed on a bottom surface of the housing; a plurality of terminals inserted and fixed into the housing so that one ends are positioned inside the housing and the other ends are projected to an outside of the housing; and terminal units in contact with top surfaces of the connection pads by being connected to the one ends of the terminals inside the housing.

Connector

A backlight assembly includes a switching section for switching on/off an input voltage so as to output a primary voltage in accordance with a control signal; and a voltage boosting section for boosting the primary voltage received at a primary side thereof to a secondary voltage at a secondary side thereof. The primary and secondary sides of the voltage boosting section are electrically isolated from each other. In a feedback link for supplying the control signal from the secondary side to the primary side, a signal isolation section is provided for both transmitting the control signal between and electrically isolating primary side and secondary side portions of the feedback link. Additionally or alternatively, a balancing circuit section is connected between the secondary side of the voltage boosting section and a plurality of lamps so as to uniformly supply an alternating current, generated by the secondary voltage, to the lamps, in order to uniformize the luminances of the lamps.

Backlight assembly having voltage boosting section with electrically isolated primary side and secondary side

Disclosed herein is a backlight inverter for a U-shaped lamp which is capable of detecting an abnormal state of an inverter circuit. The backlight inverter comprises a driver for supplying first and second transformer drive voltages in response to an operation control signal and cutting off the supply of the transformer drive voltages in response to a shutdown control signal, first and second transformers for boosting the transformer drive voltage in a turn ratio between primary and secondary windings thereof and supplying the resulting drive voltage to the U-shaped lamp, first and second voltage detectors for detecting voltages across the secondary windings, respectively, first and second current detectors for detecting currents flowing through the secondary windings of the first and second transformers, respectively, an inverter abnormal state detector for detecting an abnormal state of the inverter, and a driver controller for controlling a normal operation or shutdown of the driver.

Growing community of inventors

Suwon, South Korea

Ju Rae Kim