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7605570 |
Bridgeless PFC converter with low common-mode noise and high power density
A bridgeless power factor correction converter that can reduce common-mode noise and enhance power density is made up of a boost inductor coupled to an input end, a bidirectional switch connected...
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7570029 |
Active power conditioner
An active power conditioner includes a first power electronic switch set, a second power electronic switch set, a third power electronic switch set, an input filter and an output filter. The active...
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7567064 |
Systems of parallel operating power electronic converters
A converter unit is disclosed which produces an output voltage based on reference signals (u* d , u* q ) that are generated from active and reactive components (P, Q) of the converter's output...
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7555665 |
Method and apparatus of disabling converters in a power module
A power module includes a plurality of converters having outputs for coupling to a supply voltage. The power module further includes a connector having a pin to provide a signal indicative of...
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7535734 |
High power-factor AC/DC converter with parallel power processing
The present invention is an AC/DC (alternating current to direct current) converter. The converter contains two semi-stages. One is the boost-flyback semi-stage that has excellent self-PFC property...
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7514912 |
System and method for power controller
System and method for power controller. According to an embodiment, the present invention provides a power factor correction apparatus. The apparatus includes a multiplier component that is...
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7508173 |
System and method for providing reactive power support with distributed energy resource inverter
A reactive power compensation system includes a distributed energy resource situated at a local location configured to also receive power from a remote location by a distribution feeder line. The...
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7501800 |
Power factor correction circuit and output voltage control method thereof
Disclosed is a power factor correction circuit for varying an output voltage according to an input voltage, and an output voltage control method thereof. A reference voltage is generated...
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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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7466110 |
Power factor improving circuit
A power factor improving circuit including: a boost reactor that inputs a rectified voltage obtained by rectifying an AC power supply voltage of an AC power supply by a rectifier circuit; a main...
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7458934 |
Electrical adapter for medical diagnostic instruments using replaceable LEDs as illumination sources
An LED for use with a medical diagnostic instrument having an adapter disposed between an instrument head and a hand-grippable handle, the LED being removably attachable in relation to the adapter...
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7450407 |
Control method of AC/DC power converter for input current harmonic suppression
A harmonic-suppressing AC/DC power converter employs a control method for permitting the AC/DC power converter only to detect an input AC current and an output DC voltage. The control method can...
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7446511 |
Active power conditioner for AC load characteristics
An active power conditioner, connecting with a load and a power source in parallel, includes a DC power capacitor, a power converter, a high-frequency filter and a control circuit. The control...
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7436155 |
Control device for a three-phase machine and method for operating the control device
A control device for a three-phase machine contains an inverter, which can be connected on the input side to a direct voltage source and on the output side to the three-phase machine. The control...
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RE40528 |
Voltage fluctuation compensating apparatus
Voltage compensating circuits are connected serially to a power system, including capacitors each having different charging voltages (in relationship of approximately 2 k (K=0, 1, 2, . . . ) times...
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7427852 |
Low power control mode for power supply
Systems and methods are disclosed to mitigate power consumption in a power supply, such as when operating in a low power mode. One aspect of the present invention relates to a control system for a...
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7400517 |
Power factor correction circuit and method therefor
In one embodiment, a power factor correction circuit is configured to use a stored value of a feedback signal to assist in regulating the value of an output voltage and to bypass the sample and...
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7397678 |
Method for driving a switch that controls current drawn in a power factor correction circuit and a drive circuit therefor
The invention relates to a method for provision of a drive signal for a switch which controls the current drawn by an inductive energy storage element in a power factor correction circuit, in which...
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7394226 |
High voltage generation systems and methods
Systems and methods presented herein generally provide for the controlled voltage of electrical energy through the selected operation of power stages. Generally, a system that provides electrical...
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7388766 |
Harmonic control and regulation system for harmonic neutralized frequency changer
A control and regulation system for use with a harmonic neutralization frequency changer system. In the generalized frequency changer system, a direct converter frequency changer is used to convert...
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7382112 |
Methods and devices for input waveform control in switching power supplies
The invention recognizes that filter size can be reduced substantially as power factor is permitted to deviate below unity in systematic ways. Preferred methods of the invention provide specific,...
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7352597 |
Comprehensive power quality controller for substation in power system
This invention disclosed is a comprehensive power quality controller for substation in the electric power system and includes a Thyristor Controlled Reactor (TCR), pure tuned passive filter Z f ,...
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7345379 |
Power converter with voltage and current fault setting
A power converter includes a steady-state controller for outputting a first voltage command such that a detected power value matches a power command, a transient controller for outputting a second...
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7339480 |
Power processing interface for passive radio frequency identification system
A power processing interface for a radio frequency identification system is provided. The power processing interface includes a resonance circuit for inducing a first signal transmitted from a...
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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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7317625 |
Parallel current mode control using a direct duty cycle algorithm with low computational requirements to perform power factor correction
A method and apparatus to implement parallel current mode control that is suitable for digital and analog implementation. A duty cycle algorithm is composed of a voltage term and a parallel current...
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7317286 |
Power supply apparatus for discharge lamp and control method for the same
An apparatus supplies power to at least one discharge lamp. The apparatus includes a buck converter for regulating power supplied to at least one discharge lamp having a switching element driven by...
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7312600 |
AC power regulator circuit
An electronic control system regulates and stabilizes AC line voltage to produce a constant AC voltage output. A switch-mode regulator circuit is employed in conjunction with a variable amplitude...
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7310253 |
Power conversion circuit control apparatus
This invention provides a power conversion circuit control apparatus which rapidly detects the voltage amplitude and phase of each phase, corrects the output of a current controller by the mean...
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7307405 |
Transition mode operating device for the correction of the power factor in switching power supply units
A transition mode operating device for the correction of the power factor in switching power supply units includes a converter for receiving an input voltage and for providing a regulated output...
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7294993 |
Method and apparatus for customizing of a power supply based on load characteristic data
A power supply for powering an electrical load, the electrical load generating load characteristic data that determines a power supply characteristic to be provided to the electrical load from the...
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7289341 |
Power supply adaptive feedforward control circuit
A power supply system is disclosed. In one embodiment the power supply system includes a source of DC power that provides a DC bus voltage between a pair of DC bus terminals, and a power supply...
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7277779 |
Real-time emergency control in power systems
The present invention is concerned with a method for real-time emergency control of power transmission networks, based on a modification of the model predictive control (MPC) approach. Following...
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7272026 |
Power converter for a hybrid power filter
A power converter for a hybrid power filter includes a power electronic switch set and a DC capacitor. The power converter permits a power line of a power system to directly connect or connect...
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7265521 |
Reactive power compensation to minimize step voltage changes and transients
The invention features a system and approach for minimizing the step voltage change as seen by the utility customer as well minimizing transients imposed on the fundamental waveform of a normal...
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7250742 |
Digital control of bridgeless power factor correction circuit
A circuit for providing power factor correction includes a bridgeless boost converter circuit and a control circuit receiving an input AC line voltage of the bridgeless boost converter circuit,...
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7221128 |
Converter with start-up circuit
A converter is provided in which the cost and size of which are reduced by a decrease in current consumption with no need of large elements or radiation fins. The converter has a switching element...
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7205749 |
Power line communication using power factor correction circuits
A PFC circuit modulating a power line using pulse width modulation (PWM) to drive a power MOSFET and series inductor across the power line. Since many modern electronic systems include a power...
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7200500 |
Determining parameters of an equivalent circuit representing a transmission section of an electrical network
A method for determining an equivalent impedance of a transmission section of an electrical network, includes representing the transmission section as having at least two interfaces with other...
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7199552 |
Control circuit apparatus and power supply circuit control method
A microcomputer outputs a command to a control IC to operate first and second loads. The control IC sets first and second DC/DC converters' on-state to operate the first and second loads. The first...
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7183751 |
Reactive power compensator device
A reactive power compensator device includes an AC capacitor and a small-capacity power converter serially connected thereto that avoid the problems of power resonance and harmonic current...
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7180273 |
Low switching frequency power factor correction circuit
A power factor correction circuit for driving a switch of a boost type converter circuit having an AC line frequency input, comprising a sense circuit for sensing and comparing the output voltage...
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7176660 |
Switching power source apparatus and power factor corrector
A power factor corrector is connected to an AC power source, to provide a first DC voltage. A DC-DC converter supplies the first DC voltage from the power factor corrector to a primary winding of a...
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7157886 |
Power converter method and apparatus having high input power factor and low harmonic distortion
A single stage, single switch, input-output isolated converter configuration which uses a hybrid combination of forward and flyback converters is disclosed. The converter operates at a high input...
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7154253 |
Digitally controlled modular power supply for automated test equipment
A digitally controlled hybrid power module is controlled by a programmable controller. The hybrid power module includes a digitally controlled switching supply with an output coupled to an input of...
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7148661 |
Multi-pulse converter circuits
An AC to DC converter with harmonic suppression is provided. The harmonic suppression is provided by forcing an instantaneous current conflict between series connected rectifier bridges 54, 80 ,...
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7148660 |
System and method for power conversion using semiconductor switches having reverse voltage withstand capability
A power converter system is provided for supplying power to an electrical load. The power converter system includes a power converter circuit adapted to perform an AC to DC power conversion and an...
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7123494 |
Power factor correction circuit and method of varying switching frequency
A power factor correction (PFC) circuit ( 10 ) includes a pulse width modulator ( 31 ) operating in response to a clock signal (CLK) for switching a coil current (ICOIL) over a charging period...
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7117070 |
Power flow controller responsive to power circulation demand for optimizing power transfer
A power flow controller responsive to power circulation demand for optimizing power transfer is disclosed. When a power flow controller operates at its rated capacity, it can no longer regulate...
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7116010 |
Control of small distributed energy resources
A power electronics interface in a microsource controller allows efficient connection in a power system of small, low cost and reliable distributed generators such as microturbines, fuel cells and...
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