Samsung Electro-mechanics Co., Ltd.

Other

Sungkyunkwan University

Jong Sun Kim

Dong Seong Oh

Jong Hae Kim

Choong Sik Yoo

Jae Sun Won

Jin Wook Kim

Sung Soo Hong

Sang Kyoo Han

Chung Wook Roh

Joo Hyun Yoo

Yong Woo Lee

Jong Soo Kim

Sug Chin Sakong

Il Yong Yun

Sang Hyun Lee

Byoung Own Min

Gun Woo Moon

Byoung Kuk Lee

Gyu Yeong Choe

Don Sik Kim

Min Su Kim

Byoung Woo Ryu

Gun-Woo Moon

Sang Woo Park

Seong Wook Choi

Dea Min Jang

Jae Myun Lee

Joo Chun Yoon

Il Woon Lee

Suok Gyu Min

Jong Man Jung

Sang Hun Lee

Won Sik Oh

Jin Wok Kim

Sang Un Son

There are disclosed a photovoltaic and fuel cell (PV-FC) hybrid generation system using a single converter and a single inverter, and a method of controlling the same. The PV-FC hybrid generation system includes a DC/DC converter unit converting an FC output voltage from a fuel cell, converting chemical energy into electrical energy, into a preset voltage, a DC link unit commonly connecting an output terminal of a photovoltaic cell, converting the sunlight into electrical energy, and an output terminal of the DC/DC converter unit, and linking the converted FC output voltage from the DC/DC converter unit with a PV output voltage from the photovoltaic cell to thereby generate a DC voltage, and a DC/AC inverter unit converting the DC voltage from the DC link unit into a preset AC voltage. Furthermore, a method of controlling the PV-FC hybrid generation system is proposed.

Photovoltaic and fuel cell hybrid generation system using single converter and single inverter, and method of controlling the same

The present invention relates to power supplies, and more particularly, to a power supply having a maximum power point tracking function that can reduce manufacturing costs and circuit size by using a maximum power point tracking section with a simplified circuit in a solar photovoltaic power generator supplying power using sunlight instead of using a micro controller, the maximum power point tracking section that controls power switching according to a result of integration of a value obtained by dividing a power variation by a voltage variation to track a maximum power value. A power supply having a maximum power point tracking function according to an aspect of the invention may include: a converter section switching input power, and converting the switched input power into predetermined DC power; and a maximum power point tracking section detecting a voltage and a power value of the input power, dividing a variation of the detected power by a variation of the detected voltage, integrating a result of the division, and controlling the switching operation of the converter section according to a value of the integration.

Power supply having an improved maximum power point tracking function

There is provided a high voltage power supply capable of reducing voltage stress of a voltage multiplying device. The high voltage power supply includes: a power converter switching on/off and converting an input direct current power into a direct current power having a preset voltage level; and a voltage multiplier including a first multiplying cell multiplying the voltage level of the direct current power from the power converter, wherein the first multiplying cell includes: first and second capacitors charging the direct current power from the power converter, respectively; a first diode providing a path for transferring the direct current power when the power converter is switched off; and a second diode providing a path for transferring the direct current power when the power converter is switched on.

High voltage power supply

In accordance with the present invention, the SMPS circuit for PDP includes first and second transformers inducing voltages supplied to primary sides to secondary sides; a plurality of DC/DC converters connected to secondary sides of the first and second transformers and supplying voltages of different sizes; a clamp circuit connected to the secondary side of the first transformer and outputting an address voltage of a predetermined size by receiving a voltage supplied from the first transformer; and a linear regulator unit connected to the DC/DC converter for supplying a low voltage among the DC/DC converters connected to the secondary side of the first transformer and outputting a gate voltage of a predetermined size by receiving the low voltage supplied from the DC/DC converter.

Switching mode power supply for plasma display panel

An advantage of the present invention is to provide an adapter power supply which varies a link voltage of DC power serving an input power of a DC/DC converter according to variation of a load current estimated by measuring a secondary current using a lossless current measurement technique at a primary terminal of a transformer of the DC/DC converter and thus presuming a load current of an output power. An adapter power supply according to present invention may include an AC/DC converter converting a commercial AC power into a DC power; a DC/DC converter including a transformer composed of a primary terminal and a secondary terminal in order to output an output power by converting a link voltage of the DC power; and a controller presuming a load current of the output power through a primary current of the transformer and varying the link voltage of the DC power according to variation of the estimated load current.

Adapter power supply

A power supply having a maximum power point tracking function that controls power switching so that a detected power value is within a reference range having a maximum power point in a predetermined current-voltage curve includes: a converter section switching input power and converting the switched input power into predetermined DC power; and a maximum power point tracking section detecting a power value determined according to a switching operation of the converter section among power values included in a predetermined power-voltage curve, and controlling the switching operation of the converter section so that the detected power value is located within a predetermined reference range having a maximum power value among the power values included in the power-voltage curve.

Power supply having maximum power point tracking function

Disclosed is a multi-output DC/DC converter controlling power-conversion switching in synchronization with a frequency of one output voltage among multiple output voltages in an LLC resonant DC/DC converter. The multi-output DC/DC converter includes a power conversion circuit performing alternate switching on an input DC voltage to output multiple DC voltages including a first DC voltage and a second DC voltage each having a preset voltage level, and a control circuit controlling the alternate switching of the power conversion circuit in synchronization with a preset resonant frequency.

Multi-output DC/DC converter

A driving method of external electrode fluorescent lamp inverter for backlight. In the driving method, a square wave voltage frequency for driving the external electrode fluorescent lamp is applied to the primary side of a transformer in the region whose frequency is substantially &#xbd; of the resonant frequency which is determined by the capacitance of the external electrode fluorescent lamp and the leakage inductance of the transformer. Then, the external electrode fluorescent lamp is caused to emit light by the self-discharge to thereby obtain high efficiency and high luminance. The driving method of external electrode fluorescent lamp inverter for backlight includes applying a square wave voltage for driving an external electrode fluorescent lamp to the primary side of a transformer; and applying the square wave voltage to the primary side of transformer in a region where the frequency thereof is substantially &#xbd; of a resonant frequency, which is determined by the capacitance of the external electrode fluorescent lamp and the leakage inductance of the transformer, and thus causing the external electrode fluorescent lamp to emit light by the self-discharge.

Driving method of external electrode fluorescent lamp inverter for backlight

In a piezoelectric transformer for a fluorescent lamp, the size of an electrode at a central region of each side on a first face is smaller than that of electrodes at the corner region thereof. As a result, the stress generated in the piezoelectric block is minimized and the heat caused by stress is prevented, so that the damage of the piezoelectric block and the deterioration of the efficiency may be prevented. The input electrode can be formed in various shapes such as diamond, cross, and rhombic shapes.

Piezoelectric transformer for fluorescent lamp

An apparatus for preventing reverse flows in a drainage is disclosed. In this apparatus, a floating device ( ) and a reverse flow preventing device ( ) act mutually in opposite directions owing to the floating force and the water pressure, and thus the bottom of the round body ( ) of the apparatus is automatically opened and closed, so that the drainage can efficiently work, and the waste water and the draining water with foul odors can be prevented from flowing reversely. The apparatus for preventing reverse flows of waste water according to the present invention includes a round body ( ) to be installed in a drain hole ( ). A guide member ( ) is installed on a second filtering net ( ) of the top of the round body ( ), and has a guide ( ) at the center of it. An openable/closable device actuating member ( ) is insertingly installed on the guide member ( ), for moving up and down along the guide ( ) owing to the floating force and the self-gravity. An openable/closable member ( ) is installed on the guide member ( ), for causing an air-tight sealing part to be opened and closed by being oppositely interlocked to the openable/closable device actuating member ( ).

Apparatus for preventing reverse flow in drainage

A piezoelectric ceramic composition with superior dielectric constant, mechanical quality factor Qm and electromechanical coupling factor Kp, and a high power output piezoelectric transformer made from the composition are disclosed. The piezoelectric ceramic composition is composed of Pb &lsqb;(Sb Nb ) (Zr Ti ) &rsqb; O &plus;yPbO&plus;zMnO, where x is 0.01-0.05, y is 0.3-0.6 wt %, and z is 0.7 wt % or less.

Piezoelectric ceramic composition, and high power output transformer made of the same composition

A piezoelectric ceramic composition with superior mechanical quality factor Qm and electromechanical coupling factor Kp, and a high power output piezoelectric transformer made from the composition are disclosed. The piezoelectric ceramic composition according to the present invention is composed of Pb Sr &lsqb;(Ni W ) (Mn Nb ) (Zr Ti ) &rsqb;O &plus;kPbO, where a is 0-0.06, b is 0.01-0.05, c is 0.01-0.09, x is 0.47-0.53, and k is 0.1-0.7 wt %.

Digital controlled electronic ballast with piezoelectric transformer

Growing community of inventors

Gyeonggi-do, South Korea

Jong Sun Kim