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US20090316447 |
POWER SUPPLY HAVING MAXIMUM POWER POINT TRACKING FUNCTION
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...
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US20090279915 |
METHOD AND APPARATUS FOR GENERATING A SPREAD SPECTRUM SIGNAL IN A PRINTER POWER SUPPLY UNIT
A method and apparatus that generates a spread spectrum signal in a printer power supply unit is disclosed. The method may include receiving an enable signal to power on the printer power supply...
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US20090265040 |
Matrix Converters For Wind Energy Conversion Systems
The invention is an efficient matrix converter for wind energy conversion systems (WECS) using permanent magnet DC generators, incorporating control algorithms integrated with rotor aerodynamics,...
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US20090237962 |
MULTI LEVEL INVERTER
The present invention relates to a multilevel inverter comprising: a converter unit converting an inputted AC power source to a direct current (DC) power source; a film capacitor rectifying the DC...
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US20090237961 |
INVERTER
The inverter comprises a diode bridge ( 21 ) that rectifies an inputted three-phase AC voltage into a DC voltage, an inverter section ( 22 ) that converts the DC voltage converted by the diode...
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US20090225570 |
Twelve-pulse HVDC Transmission
A device for transmitting electric power between alternating voltage networks includes converters interconnected by direct current lines and provided each with several six-pulse conversion bridges....
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US20090219696 |
POWER CONVERSION DEVICE AND FABRICATING METHOD FOR THE SAME
A power conversion device in which the inductance of a main circuit is reduced, a surge voltage is suppressed, elements are properly cooled, which is miniaturized and reduced in weight as a whole,...
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US20090179494 |
On-line uninterruptible power system
The present invention discloses an on-line uninterruptible UPS system, comprising an AC-DC conversion circuit, a DC-AC conversion circuit and a backup battery circuit, characterized in that the...
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US20090167199 |
FRONT-STAGE VOLTAGE-ADJUSTMENT INVERTER
The present invention discloses a front-stage voltage-adjustment inverter, which comprises: a front-stage voltage-adjustment unit, a duty cycle modulation unit, a half-bridge driving unit and a...
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US20090154201 |
ALTERNATING VOLTAGE GENERATOR EQUIPPED WITH A CURRENT LIMITING DEVICE
The invention relates to an alternating voltage generator ( 10 ) comprising a direct voltage source ( 20 ) that supplies a power bus, a bus capacitor ( 11 ) connected to the power bus, an inverter...
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US20090129128 |
Uninterruptible power supply apparatus
An uninterruptible power supply device connects a battery for power-outage backup to the output side of an AC/DC converter. An input monitoring circuit monitors alternating current input of the...
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US20090129126 |
Single Phase Power Supply for Inductively Coupled Power Transfer Systems
An ICPT system has a single phase power supply which energises a conductive path ( 13 ) and has an inverter ( 5 ) to provide an alternating current at an operating frequency greater than the single...
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US20090116265 |
DRIVING CIRCUIT FOR POWER SWITCHING DEVICE, DRIVING METHOD THEREOF, AND SWITCHING POWER SUPPLY APPARATUS
A driving circuit according to the present invention is a driving circuit which drives the voltage control type switching device in the switching power supply apparatus and includes: a generation...
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US20090102618 |
Uninterruptible Power Supply Unit
[Object] To allow multiple power line communication (PLC) devices to communicate with one another via power lines without being affected by the power supply state of an uninterruptible power supply...
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US20090091955 |
Quasi resonant switching mode power supply
A switching mode power supply (SMPS) and a driving method thereof are provided. The SMPS includes a power supply block that includes a first switch coupled to a first coil of a primary side of a...
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US20090086515 |
DIRECT AC POWER CONVERTING APPARATUS
Capacitors are connected in series between a first DC link section and a second DC link section when the capacitors are charged by a regenerative current derived from an inverter section. During...
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US20090052209 |
Inverter Device
An inverter device includes a converter circuit that rectifies a first alternating current output from a power supply to generate a rectified current, a capacitor that stores therein the rectified...
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US20090021963 |
Uninterruptible power supply, connected to a grid
The present invention relates to an Uninterruptible Power Supply and a method for operating an Uninterruptible Power Supply, where the UPS is connected between a grid and a consumer, where the UPS...
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US20080298096 |
Dual voltage wye-connected H-bridge converter topology for powering a high-speed electric motor
A topology for a three-phase, wye-connected H-bridge converter allowing continued operation when one H-bridge phase has failed by bypassing the failed H-bridge, increasing dc-bus voltage to provide...
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US20080291704 |
DRIVING DEVICE AND METHOD FOR PROVIDING AN AC DRIVING SIGNAL TO A LOAD
In a driving device and method for providing an AC driving signal to a load, a first voltage converting unit converts an external AC voltage signal into a DC voltage signal using pulse width...
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US20080285314 |
ADVANCED MATRIX CONVERTER AND METHOD FOR OPERATION
A matrix converter may be provided with AC switches that comprise bi-directional sets of semiconductor switches that are gated with a common gating link. A low loss diode-bridge based snubber may...
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US20080278976 |
DYNAMIC VOLTAGE SAG CORRECTION
A voltage sag correction device includes an input terminal adapted to receive a first operating signal having a line-to-neutral voltage. The first operating signal is provided to a load through an...
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US20080259658 |
Limit for the harmonics of a current
A wiring arrangement and an appliance for limiting the harmonics of a current supplied to a frequency converter from an AC electricity supply network, which frequency converter can be connected to...
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US20080246336 |
Current Fed Inverter with Pulse Regulator for Electric Induction Heating, Melting and Stirring
A current fed inverter with duty cycle regulation of dc current to the input of the inverter is provided to increase the magnitude of inverter output power while operating a resonant load at...
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US20080239769 |
DEVICE FOR TRANSFORMING A PRIMARY AC VOLTAGE IN A LOWER AC VOLTAGE FOR SUPPLYING AN ELECTRICAL LOAD
A device for transforming an AC voltage to a lower AC voltage includes a generator of a PWM control signal and a first bidirectional switch to couple a load to the AC voltage during a...
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US20080232143 |
METHOD OF DESIGNING A STATIC SYNCHRONOUS COMPENSATOR BASED ON PASSIVITY-BASED CONTROL
This invention presents a method of novel nonlinear control for designing Static Synchronous Compensators (STATCOM). A passivity-based approach is proposed for designing robust nonlinear STATCOM...
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US20080219034 |
Circuit, Shrink Fixing and Regulation Method
A circuit 1 for controlling the supply of electrical power to an induction coil 2, in particular to an induction coil 2 for heating a shrink attachment for tools, comprises a rectifier 3, ...
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US20080211449 |
Multiphase Current Supplying Circuit, Driving Apparatus, Compressor And Air Conditioner
A multiphase current supplying circuit includes a converter, an intervening circuit, an inverter, a control circuit and a lightning arrester. A power supply system is connected to the converter...
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US20080205094 |
Power Supply Unit for the Motor of a Magnetic Levitation Railway System
A power supply to the motor of a magnetic levitation railway system is provided with higher shut-off security which is comparably more economical and compact, and has a shorter shut-off time. As a...
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US20080205093 |
Apparatus for Electrical Power Transmission
A device for the transmission of electrical energy includes at least one current converter. Each current converter has phase elements with respective arrangements of circuit elements that comprise...
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US20080186744 |
Method and Device for Transforming and Regulating a Voltage Signal
The present invention is generally directed to an efficient voltage transforming and regulating device based on a High Frequency (HF) transformer and a HF Electromagnetic Voltage Regulator (HFEVR)...
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US20080137383 |
Two-phase power converter apparatus and method
A power conversion apparatus and method suitable for use with a variable speed two-phase generator are disclosed herein. A rectifier module is adapted to receive varying electrical power from a...
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US20080094864 |
Polyphase Current Supplying Circuit and Driving Apparatus
This invention is to reduce a voltage across a smoothing capacitor in a single-phase capacitorless inverter. A smoothing circuit ( 15 ) has a smoothing capacitor (C) connected between a pair of...
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US20080080213 |
Method for smoothing input current to a power delivery system having regeneration capability
A method for smoothing input current to a power delivery system having regeneration capability. The method comprises evaluating input current to an input converter of the power delivery system for...
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US20080080214 |
RECTIFIER CIRCUIT AND RADIO COMMUNICATION DEVICE USING THE SAME
A rectifier circuit includes an input terminal that receives an alternating-current signal, a first rectifier circuit that generates a first direct-current voltage from the alternating-current...
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US20080068870 |
Power Unit
This invention realizes control without using a current-detecting element to prevent over current from flowing into a switching element of a switching converter in response to an input primary...
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US20080062727 |
LAMINATED BALUN TRANSFORMER
A laminated balun transformer that achieves improved balance characteristics and prevents the occurrence of parasitic inductance has an impedance transformation ratio of one to four and outputs...
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US20080049462 |
Power level balance of frequency converters connected in parallel
A method and a parallel connection arrangement for equalizing the output powers of power converter units (INU 11 , INU 12 ), in which power converter units is a semiconductor switch bridge...
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US20080049461 |
Power supply having multiple power output
A power supply having multiple power output includes a power source to supply an AC signal to an EMI filter unit and a commutation unit that filter and commutate the AC signal and output a full...
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US20080049463 |
STABILIZED POWER SUPPLY
A stabilized power supply for X-ray tubes having a first rectifier circuit, an inverter circuit comprising main switches, a transformer, a second rectifier circuit an oscillation circuit and an...
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US20080031019 |
Universal Power Conversion Methods
Methods and systems for transforming electric power between two or more portals. Any or all portals can be DC, single phase AC, or multi-phase AC. Conversion is accomplished by a plurality of...
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US20080019155 |
UNINTERRUPTIBLE POWER SUPPLY WITH LOW LEAKAGE CURRENT
An uninterruptible power supply having a controllable leakage current is disclosed. The leakage current is controlled by adjusting a switching speed (i.e., dV/dt rate) of switches in the output...
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US20080013346 |
ACTIVE CLAMP RESONANCE CONTROL
According to some preferred embodiments, power converter includes a comparator circuit with feedback from current-fed PI or PID control to select one of two regeneration times of at least one...
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