Abstract:
PURPOSE: A multiphase interleaved bidirectional DC-DC converter having a high boosting ratio is provided to implement the high efficient DC-DC converter by minimizing the conduction loss of each element through a paralleled mode. CONSTITUTION: A first input and output unit(110) includes a power element(111) and a plurality of inductors(112). A first half bridge(120) controls the voltage from the first input and output unit. A second input and output unit(130) inputs or outputs a single voltage. A second half bridge(140) controls the voltage from the second input and output unit. The second half bridge is connected between the second input and output unit and a transformer(150). [Reference numerals] (AA) Power flow; (BB) Primary side; (CC) Secondary side
Abstract:
PURPOSE: A synchronous buck converter distributing a current using input voltage difference and a current distributing method using the same are provided to prevent the heating of a device by reducing the difference of current amount distributed to the buck converter connected in parallel. CONSTITUTION: An input unit(100) supplies an input current(Iin) and an input voltage(Vin). A first converter(110) includes a first current generator(110a), a first PWM controller(110b) and a first sensor(110c). A second converter(120) includes a second current generator(120a), a second PWM controller(120b) and a second sensor(120c). A current difference detector(130) compensates a reference current by detecting the ripple difference of the input voltage. A frequency signal generating circuit(140) generates a frequency signal having a constant frequency. [Reference numerals] (100) Input unit; (100a) First current generator; (100b) First PWM controller; (100c) First sensing unit; (120a) Second current generator; (120b) Second PWM controller; (120c) Second sensor; (130) Current difference detector; (140) Frequency signal generating circuit
Abstract:
PURPOSE: A heating cabinet is provided to heat food and beverage in the cabinet by the solar energy if storing in the cabinet for predetermined time because the heating cabinet is installed on a window. CONSTITUTION: A heating cabinet(100) comprises a body member(110) and an attaching and detaching member(120). The exterior surface of the body member is made of transparent material. An accommodating space is formed inside the body member. Heat-retaining fluid heated by the solar energy is filled in a part of body member covering the accommodating space. The body member stores heat to the heat retaining fluid using the external solar energy and objects in the accommodating space keep warm by the heat. The attaching and detaching member is formed in one side of the body member and attaches and detaches the body member to a window.
Abstract:
PURPOSE: An HID(High Intensity Discharge) lamp driving circuit is provided to secure stable driving of the HID lamp by preventing an overvoltage after ignition of the HID lamp. CONSTITUTION: A power supply unit(1) rectifies AC power to DC power. An inverter(2) converts the DC power to the driving power of the lamp according to a switching driving signal. A control value generator(4) outputs a driving control signal for controlling a switching driving signal. An error amplifier(5) outputs the voltage in proportion to the difference between the output of the control value generator and the current transformer. A start frequency setting circuit(9) controls an initial voltage applied to the lamp. A voltage controlled oscillator(6) outputs the frequency corresponding to the output voltage of the start frequency set circuit and the output voltage of an error amplifier.
Abstract:
A method for fabricating an LED lamp is provided to improve a heat radiation characteristic as compared with a conventional high-output LED by directly radiating the heat generated by the light emitted from an LED through a substrate. An insulation layer is coated on the upper surface of a substrate(2), made of a predetermined pattern by an etch process. A metal layer is coated on the upper surface of the substrate by an etch process, having an electrode pattern(23) including a groove part on which an LED chip(3) is placed. The LED chip is directly inserted into the upper surface of the substrate through the groove part of the metal layer, connected to the electrode pattern by a wire. A reflection body(4) is inserted into the circumference of the LED chip connected to the electrode pattern wherein the upper part of the reflection body is broad and the lower part of the reflection body is narrow, having a through hole in its center to reflect the light emitted from the LED chip to the front area so that the lower part of the reflection body is open. A molding part(5) is molded by transparent resin to cover the LED chip, the electrode pattern and the reflection body. The metal layer can be made of copper.
Abstract:
A luminaire with a particular auto illumination control function is provided to reduce power consumption and be semi-permanently used by using a lighting composed of a plurality of light emitting diodes. A luminaire with a particular auto illumination control function includes a body(1), a plate(12), a plurality of light emitting diodes(121), a controller(14), and a power supply unit. The body is provided with an electrode unit(11) which is attachable to and detachable from one side or both sides. The plate is provided in a lower part of the body. The light emitting diodes is emitted by power supplied through the electrode unit. The controller is provided in the body and controls lighting of the light emitting diodes according to a sensed signal. The power supply unit converts and supplies the power supplied through the electrode unit to constituent components.
Abstract:
An inrush current suppressing circuit for a power supply is provided to efficiently inhibit a second inrush current as well as an initial inrush current by using a resistor. An inrush current suppressing circuit for a power supply includes a normal power supply(1), a bridge diode rectifier(2), a smoothing capacitor(C0), a switching regulator(3), a resistor(R0), an MOSFET(Metal Oxide Semiconductor Field Effect Transistor)(Q1), and a driving circuit(4). The normal power supply supplies normal AC power. The bridge diode rectifier converts the normal AC power to DC power. The smoothing capacitor outputs smooth voltage. The switching regulator switches the smooth voltage by the smoothing capacitor. The resistor is connected between the bridge diode rectifier and the smoothing capacitor, and suppresses initial inrush current. The MOSFET receives a driving voltage through a gate and is connected to the resistor by a source(6) and a drain(7). The driving circuit outputs the driving voltage to the MOSFET in proportion to the voltage of the smoothing capacitor. Second inrush current is limited if the voltage of the smoothing capacitor is sufficient when the power supply is turned on and is inhibited if the voltage of the smoothing capacitor is not sufficient by flowing current only with the resistor.
Abstract:
A lighting system is provided to enhance operation efficiency of the lighting system by simplifying a power conversion scheme by directly supplying a stabilized AC voltage to a load after converting a DC voltage to the AC voltage. A lighting system includes a DC energy source(1), a DC ballast(2), and a lamp(3). The DC energy source generates a DC voltage. The DC ballast converts the DC voltage to a stabilized AC voltage and outputs the AC voltage. The lamp is driven by the AC voltage which is inputted from the DC ballast. The lighting system includes an AC voltage source(4) which supplies a commercial AC voltage. The DC energy source and the AC voltage source are coupled with each other. A complex power supply(5) outputs the power from the DC energy source and the AC voltage source to the electric energy.
Abstract:
본 발명은 램프 구동 전원 시스템의 보호 장치에 관한 것으로, 특히, 정류기와, 역율제어회로부와, 인버터 스위치부와, 필터부로 구성된 램프 구동 전원 시스템에 있어서, 역율제어회로부를 구동시키는 제어IC; 인버터 스위치부를 구동시키는 스위치 구동회로부; 필터부의 인덕터 전압을 측정하여 과전압 상태이면 구동하여 스위치 구동신호를 출력하는 보호회로부; 필터부의 인덕터 전압을 인덕터의 2차권선을 사용하여 피이드백하여 공급하는 제어IC 전원부; 제어IC 전원부의 입력단에 애노드 단자가 접속된 제 1 다이오드와, 스위치 구동회로부의 출력단에 애노드 단자가 접속되고, 캐소드 단자가 제 1 다이오드의 캐소드 단자와 접속하는 제 2 다이오드로 구성된 다이오드부; 및 제 1, 2 다이오드의 캐소드 단자 사이에 애노드 단자가 병렬 접속되고, 캐소드 단자가 접지되며, 게이트 단자가 보호회로부의 출력단에 접속된 반도체 스위치를 포함하여 구성된 것을 특징으로 하며, 이러한 본 발명은 과전압으로 인한 램프의 손상을 신속히 방지함은 물론 전기적인 손실을 방지하고, 또한 램프 구동을 위한 전원 시스템의 각 구성의 고장을 미연에 방지하여 시스템내 회로의 안전을 신속하게 확보할 수 있는 뛰어난 효과가 있다. 램프구동 전원, 안정기, 스위치 구동회로부, 보호회로부, 제어IC 전원부