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7586769 |
Power converters having balanced power rail currents
A power factor correction (PFC) circuit includes a coupled split boost choke having at least two windings, at least two boost diodes and at least two power rails. Each power rail includes one of...
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7535739 |
Semiconductor switch
A semiconductor switch interrupts output when a microcomputer or an external IC operates abnormally is connected to a control device such, and is turned on or off depending upon a control signal...
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7535124 |
Voltage stabilizer
The voltage stabilizer for stabilizing a voltage of a circuit includes a first resistor, a second resistor, a voltage controller, and a current supply unit. The voltage controller keeps a voltage...
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7495940 |
Method and device for producing rectifier gating signals using a peak detector
A device that includes an active rectifier ( 14 ) having control gates controllable to produce an output voltage on a DC bus ( 20 ), a gate control circuit ( 16 ) for producing gate control signals...
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7489532 |
Apparatus and method for a power converter with feed-forward voltage compensation to enable a PFC circuit
Apparatus and method for a power converter with feed-forward voltage compensation to enable a PFC circuit are proposed. A voltage divider and a feedback unit output a compensation voltage and a...
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7440294 |
Power adapter and power supply system using the same
The present invention is associated with a power adapter capable of simultaneously providing a low-level DC voltage and a high-level DC voltage. The power adapter includes a transformer having a...
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7394675 |
Power supplying apparatus and power supplying method
A power supply operable from a plurality of alternating current inputs had having protection from abnormal operation. The power supply includes a switchable rectifier and a voltage to voltage...
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7336509 |
Method and apparatus for estimating line inductance for PWM rectifier control
A rectifier includes a switching circuit and a controller. The switching circuit is coupled between positive and negative buses and a plurality of input voltage sources. The switching circuit...
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7321834 |
Method for calculating power flow solution of a power transmission network that includes interline power flow controller (IPFC)
Power flow models of Interline Power Flow Controllers (IPFC) for large-scale power systems are studied, in details. Mathematical models of the IPFC, using the d-q axis decompositions of control...
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7321499 |
Method of forming a power supply controller and device therefor
In one embodiment, a power supply controller uses a ramp signal to form current sense ramp compensation.
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7269038 |
Vrms and rectified current sense full-bridge synchronous-rectification integrated with PFC
A synchronous full bridge rectifier is controlled to provide a power factor near unity. The full bridge rectifiers are transistors each with a controlling input. The AC input signal and currents...
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7257010 |
Power supply circuit
A power supply circuit comprises a bridge circuit that has four rectifier elements connected and produces a rectified voltage between a positive side output terminal and a negative side output...
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7211988 |
Method for constant-current generation and device used to carry out said method
A method for constant-current generation by means of a rotational energy source, a generator and a control circuit connected to the generator. Mechanical rotational energy is generated by the...
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7206208 |
Synchronous rectifying control circuit
A synchronous rectifying control circuit for utilizing in a forward topology of rectifying circuit. The circuit controls a first current switch and a second current switch provided on both ends of...
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7193871 |
DC-DC converter circuit
Provided is a DC-DC converter circuit which is stably operated without being affected by a size of an output capacitor ( 111 ) and a cost thereof. When a switching element is turned on so that a...
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7154227 |
Circuit arrangement for operating at least one light source
A circuit arrangement for operating at least one light source. Cost-effective power factor correction of the system input is achieved by a combination of a charge pump and a valley-fill circuit....
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7072197 |
Isolated low-voltage power supply source
An isolated circuit of low-voltage supply of a control circuit of a high-voltage load, in or upstream of a fullwave three-phase rectifying bridge, comprising a first low-voltage capacitor having a...
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7061781 |
Circuit arrangement for operating light sources
In a circuit arrangement for operating light sources, inexpensive technologies for power factor correction can be used in combination. A resonant capacitor in a reactance network for coupling the...
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7038435 |
Method for input current regulation and active-power filter with input voltage feedforward and output load feedforward
An active-power filter includes control circuitry to combine an integrated output-voltage feedback signal, an input-voltage sense signal and an output-load feedforward signal to generate a control...
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7019503 |
Active power filter with input voltage feedforward, output load feedforward, and output voltage feedforward
Active power filters and methods control and regulate the input current drawn from an electric power bus to a DC level. Load current fluctuations and ripple current reflected back to the electric...
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6970365 |
Controlled frequency power factor correction circuit and method
A power factor correction (PFC) circuit ( 10 ) includes a latch ( 16 ) having an output that initiates a coil current (I COIL ) in response to a transition edge of a clock signal (CLOCK) to...
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6934169 |
Method of controlling half-controlled rectifier, and rectifier structure
A method of controlling a half-controlled rectifier, and a rectifier structure, which comprises an n-phased half-controlled converter bridge, a DC intermediate circuit and a capacitor of the DC...
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6909621 |
System for and method of controlling standby power
An apparatus for and a method of controlling standby power to minimize energy consumption in a standby mode. The standby power control apparatus includes a control unit, a power supply unit, a...
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6690592 |
Inverter with a self-commutated pulse converter on the line side and the load side
An inverter with a self-commutated pulse converter connected to the power mains and at least one self-commutated pulse converter connected to a load. The line-side converter is electrically...
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6671192 |
Power apparatus
The present invention discloses a power apparatus with the output voltage thereof made variable, which allows harmonics to be suppressed while an enhanced power factor being maintained. The power...
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6191676 |
Apparatus for suppressing nonlinear current drawing characteristics
Methods and apparatus are disclosed for suppressing or eliminating nonlinear current drawing characteristics, while at the same time substantially eliminating high order current harmonics. In...
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6178104 |
Power factor correction circuit using reverse sawtooth waves
A Power Factor Correction (PFC) circuit according to the present invention includes a boost converter which outputs a predetermined voltage according to control of a switch. The switch is coupled...
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6175218 |
Power factor correction (PFC) controller
Disclosed is a Power Factor Correction (PFC) controller which comprises a boost converter, an error amplification unit, a calculator, and a switching driver. The error amplification unit reduces...
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6061259 |
Protected transformerless AC to DC power converter
A protected, transformerless power converter for converting an AC mains power source to a low voltage DC power source is presented. The AC input voltage is rectified to supply pulsating DC voltage...
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6023419 |
Capacitor regulated controllable voltage and current power supply
The active capacitor regulating type controllable voltage and current power supply circuit is disclosed with a voltage reducing and current limiting rectifying circuit which is constituted by...
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5969962 |
Low line harmonic AC to DC power supply
Methods and apparatus are disclosed for suppressing or eliminating nonlinear current drawing characteristics, while at the same time substantially eliminating high order current harmonics. In...
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5793123 |
Electronic device with two power supply modes
The disclosure concerns an electronic device, for example a radio-alarm clock, that can be powered from the mains power supply or from batteries and can operate without interruption when changing...
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5774347 |
Apparatus and method for supplying power to an electronic device requiring a monentary supply of extra high power
Disclosed is a compact power supply unit that prevents an electronic device from being shut down even when due to an in-rush current phenomenon the electronic device requires a supply of power that...
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5691889 |
Controller having feed-forward and synchronization features
An integrated circuit controller for a switching power converter implementing feed-forward and synchronization features. The controller IC has pins which permit dual functionality. The feed-forward...
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5619405 |
Variable bandwith control for power factor correction
A regulated power supply having power factor correction control which includes a state variable integrator/error amplifier that provides a low distortion error signal during steady state operation...
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5489837 |
AC-DC converter having improved power factor to control feedback signal corresponding to output voltage of constant control circuit
An AC-DC converter of a type having an improved power factor having an arrangement that enlargements of loads to be borne by circuit components due to AC input voltage is prevented so that the size...
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5483435 |
Power generation system having induction generator and controlled bridge rectifier
A power generation system is constituted by an induction generator and a converter. An output current waveform of the induction generator is determined by the magnetic flux, speed, winding...
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5477171 |
Full wave rectifier using current mirror bridge
A full wave rectifier includes an amplifier having a minus input, a plus input and an amplifier output; an input resistor connected between a circuit input and the minus input; and a current bridge...
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5426579 |
Method and apparatus for stabilizing AC power supply systems connected to power factor correcting loads
Instabilities in the output voltage provided from an AC power supply system connected to a power factor correcting load are suppressed by a stabilizer which is connected across the output lines...
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5359278 |
Zero current switching circuit and converting apparatus using the same
A switching circuit can reduce switching power loss and can vary at least one of the switching frequency and the conduction rate of switching of the switching circuit with less dependency on a...
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5321600 |
Delta connected three phase AC-DC converter with power factor correction circuits
A three phase power conditioner. The inventive power conditioner (10) converts an alternating current input signal from a three phase source (12) into a direct current output signal and includes a...
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5307257 |
Transformerless power-supply unit for supplying a low DC voltage
A power-supply unit having a rectifier circuit, switch, first and second voltage generation circuits, a control circuit, and a capacitor. The rectifier circuit is connected to an A.C. power source....
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5301095 |
High power factor AC/DC converter
A high power factor AC/DC converter is disclosed. In the AC/DC converter in which a rectifying circuit RC1 rectifies a commercially available AC power supply Ei, a switching device turns on and off...
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5252911 |
AC to DC power converter with regulated bi-polar outputs
A AC to DC power converter unit includes an AC/DC converter section operable to convert an AC input into a plurality of unregulated internal DC outputs and a pair of positive and negative switching...
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5235504 |
High power-factor converter for motor drives and power supplies
A high power-factor converter (50) for use with motor drives and power supplies. A first and "buck"-type converter section (62) is connected to an a.c. voltage source. This section provides an...
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5140514 |
Regulation of D.C. voltage of a pulse-width modulated rectifier using spatial vectors in a stationary coodinate system
Procedure for regulating the d.c. voltage of a pulse-width modulated rectifier bridge controlled by self-commutated semiconductor components and provided with filtering coils, in which procedure...
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5134355 |
Power factor correction control for switch-mode power converters
A PFC controller (FIG. 5) provides power factor correction and peak current limiting for a switch-mode power converter of any topology (buck, boost or buck-boost), without having to directly sense...
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5099409 |
Semiconductor electric power conversion system enabling fault and/or overtemperature protection
An improved electric power conversion system comprising a multi-phase bridge circuit composed of semiconductors such as thyristors and an associated firing circuit. It is so constructed that: if...
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5051683 |
Reactive power controller without initial abrupt disturbance on power source
A reactive power controller for controlling a reactive power output from a self-commutated inverter capable of eliminating an uncontrolled reactive power at the starting moment of its operation....
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5006975 |
Power factor correction circuit
A power factor correction circuit in which a divided-down version of a rectified input waveform is sampled approximately at its peak by a sample-and-hold circuit. The peak value is then processed...
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