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7593245 |
Method and apparatus to limit maximum switch current in a switching power supply
Techniques are disclosed to limit the current in a switch of a switching power supply. An example switching regulator circuit includes a power switch to be coupled to an energy transfer element of...
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7583522 |
Low audible noise power supply method and controller therefor
A power controller forms drive pulses that reduces audible noise under light load conditions.
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7577006 |
Non-linear droop control system and method for isochronous frequency operation
Non-linear frequency droop control for isochronous frequency operation of parallel inverters includes generating a droop constant corresponding to the power level of the given inverter for...
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7567444 |
Multi-output DC-DC converter with improved cross-regulation performance
A multi-output DC-DC converter that can optimize its cross-regulation performance is proposed, in which a nonlinear inductive element functioning as a leakage inductance of an output coupled...
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7548438 |
System and method for input current shaping in a power converter
A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes, where at least one of the operation modes is a peak current...
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7545659 |
Method and apparatus for cycle error correction for a power converter device, such as an electronic power inverter
Cycle error correction is performed in an electronic power system to compensate for a difference between an AC grid side frequency and an AC load side frequency. The electronic power system can...
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7539028 |
Method and apparatus for fault detection in a switching power supply
Techniques are disclosed to detect a fault in the feedback circuit of a switching power supply while the power supply operates in a mode where the output is below its regulated value. The power...
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7528588 |
Method and circuit for limiting output voltage in a switched-mode power supply and a switched-mode power supply
A switched-mode power supply ( 200, 300, 400 ) comprises a primary side, a secondary side and a transformer ( 103, 303, 403 ) therebetween. An output on the secondary side delivers an output...
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7515443 |
Inverter circuit
An inverter circuit is configured with a reduced number of components for driving a plurality of discharge tubes. Primary coils of a plurality of drive transformers are respectively connected in...
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7511978 |
System and method for providing switching to power regulators
System and method for providing switching to power regulators. According to an embodiment, the present invention provides system for providing switching. The system includes a first voltage supply...
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7511971 |
Constant voltage circuit for power adapter
Disclosed herein is a constant voltage circuit for a power adapter which is capable of varying an output voltage with loads so as to reduce the charging time of a system battery. The constant...
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7508688 |
Method and arrangement for measuring output phase currents of a voltage source inverter under a load
A method and arrangement for measuring output phase currents of a voltage source inverter when the inverter is connected to a load, the method comprising, during commissioning of a drive, the steps...
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7502242 |
Bidirectional insulated DC/AC inverter
A plug and an outlet are electrically and directly connected, and when a control circuit determines that AC power is input from a power source to a bidirectional insulated DC/AC inverter by voltage...
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7486082 |
Anomaly detection in inverter system
An inverter system which converts DC input into AC output and supplies the AC output to a load such as an FL tube detects change in a circuit current due to anomaly such as discharge without...
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7471530 |
Method and apparatus to reduce audio frequencies in a switching power supply
An apparatus and method of switching a switch of a power supply are disclosed. According to aspects of the present invention, a method includes controlling a switch of a switching power supply to...
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7465872 |
Photovoltaic power converter system with a controller configured to actively compensate load harmonics
Photovoltaic power converter system including a controller configured to reduce load harmonics is provided. The system comprises a photovoltaic array and an inverter electrically coupled to the...
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7446512 |
Resonant switching power supply device
For the purpose of providing a resonant switching power supply device having a wide output voltage variable range by changing its switching frequency, the resonance circuit thereof comprises a...
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7436686 |
Reconfigurable voltage inverter with tolerance to failures
Voltage inverter provided with four switching cells (Q 1 to Q 4 ) to be connected to the terminals of a DC voltage source (Vdc), each comprising two semiconductor switches (I 11 , I 12 , I 21 , I...
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7433215 |
Inverter startup algorithm
A method for the startup of a solar power three-phase inverter in which a waiting period is increased between successive attempts to start the inverter. This method allows the inverter to start up...
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7428159 |
Digital PWM controller
A digital controller for controlling the operation of a DC-DC switching converter is disclosed. A digital feedback control system is provided for receiving an analog input voltage representing the...
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7426121 |
Output voltage detection circuit, isolated switching power supply, and semiconductor device
An output voltage detection circuit is provided for accurately detecting a secondary side output voltage based on a voltage induced to an auxiliary winding in an isolated switching power supply...
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7417877 |
Digital power supply with programmable soft start
A system for controlling a soft start for a switching power converter includes a digital controller that enables the programming of a plurality of input voltage profiles during a soft start...
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7417394 |
Arrangement for testing a power output stage
The invention concerns a device for controlling a final power-output stage, the latter comprising three half-bridges consisting respectively of a series circuit including an upper semiconductor...
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7417336 |
Combination current hysteresis and voltage hysteresis control for a power converter
Consistent with an aspect of the present disclosure, a method is provided for controlling an AC signal, which is supplied to a load and selectively supplied to a utility grid. In response to a...
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7371963 |
Photovoltaic power generation system
An object of the present invention is to provide a photovoltaic power generation system which is capable of achieving system linkage of a plurality of solar cell strings having different output...
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7368902 |
Impedance calibration for source series terminated serial link transmitter
Substantially-accurate calibration of output impedance of a device-under-test (DUT) to within a predetermined range of allowable impedance. The DUT is part of a source series terminated (SST)...
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7339808 |
Method and apparatus for DC to AC power generator
The dc to ac power generator has a DC power source which is connected at one pole to the primary of a conventional voltage transformer, and at its other pole to a relay controlled switching system....
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7339806 |
Adjustment device for adjusting wave shape of output of a DC-AC inverter
A DC-AC inverter has an adjustment device for adjusting wave shape of output thereof includes a feedback circuit, and a zero-crossing detector; the feedback circuit will detect and measure output...
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7324361 |
Solar array inverter with maximum power tracking
An inverter for use in connecting a DC power source to the utility grid includes a single DC-AC conversion stage, maximum (source) power tracking, and current control based on feed-forward...
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7315150 |
Method of power conversion and apparatus which achieves high power factor correction using ripple current mode control
A ripple current mode power converter comprised of a magnetic energy storage element, and a method of determining magnetic storage element charge duration based on periodic magnetic storage element...
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7298631 |
Switching power source apparatus
A switching power source apparatus can reduce the size of a transformer and realize the zero-voltage switching of a switch. The apparatus is compact, highly efficient, and low in noise. The...
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7245512 |
PID based controller for DC—DC converter with post-processing filters
A digital PID controller for controlling the operation of a switching power converter is disclosed. A data converter is provided for converting the analog sense voltage to a digital sense voltage....
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7236381 |
Current balancing circuit
There is disclosed a current balancing circuit for use in a switching power supply unit that operates in parallel with one or more other switching power supply units with current balancing...
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7224592 |
Multi-period cycle-alternative switching mode power supply control device and its control method
The present invention relates to a multi-period cycle-alternative switching mode power supply control device and its control method, and the device comprises: a power transfer control unit, a...
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7200016 |
Video cassette recorder and RCC type switching power supply
An error detection circuit includes: a Zener diode having a cathode connected through a resistor to a second DC output with a higher voltage than that of a first DC output; a voltage divider...
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7187144 |
Power converter and vehicle equipped with power converter
A power source supplies an input voltage. A voltage conversion circuit converts the input voltage from the power source into an operating voltage to be used to drive an electric load. A detection...
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7183753 |
Power factor correction circuit
A power factor correction circuit includes; a series circuit connected to a positive-electrode output terminal P 1 and negative-electrode output terminal P 2 of a full-wave rectifying circuit B 1...
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7173404 |
Auto-switching converter with PWM and PFM selection
An auto-switching converter with PWM and PFM selection supplies a boosted DC power to a load through a power switch unit. A starter outputs a starting-enabling signal. An auto PWM/PFM controller is...
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7164590 |
Power transfer system with reduced component ratings
A power inverter control adjusts input power to track with output power to reduce energy handling requirements for an inverter DC bus. Input power to the power inverter circuit is measured and...
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7164241 |
Method and apparatus for driving a gas discharge lamp
A method for driving a gas discharge lamp ( 1 ) is described, wherein electric first DC power is provided at a relatively high voltage and a relatively low current. Said first power is converted...
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7161816 |
System and method for input current shaping in a power converter
A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes corresponding to different levels of input voltage or output...
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7158395 |
Method and apparatus for tracking maximum power point for inverters, for example, in photovoltaic applications
A power system employs an outer voltage feedback loop and an inner current feedback loop to control a power converter, such as a DC to AC inverter for transferring electrical power between a power...
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7154277 |
Method and apparatus for detecting faults in AC to AC, or DC to AC power conversion equipments when the equipment is in a high impedance mode
A system for use in ac to ac or dc to ac power conversion equipment to detect faults in an inverter when the inverter is in a high impedance mode. The system detects ground faults or cross wiring...
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7148650 |
Maximum power point motor control
A method and apparatus are implemented in software to control motor speed as a function of available power in a DC source-inverter-AC motor system, i.e. to perform maximum power tracking of motor...
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7126294 |
Method and device for controlling photovoltaic inverter, and feed water device
A photovoltaic inverter control method includes steps of monitoring a variation in output voltage of a solar battery by a power and voltage monitoring circuit ( 51 ) and, when the variation occurs,...
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7126053 |
Power generation system and power generation apparatus
In a power generation system of this invention, the outputs from power generation layers electrically connected in series are input to corresponding power conversion devices, and boosted outputs...
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7102321 |
Control method for peak power delivery with limited DC-bus voltage
A method for driving a neutral point-clamped multi-level voltage source inverter supplying a synchronous motor is provided. A DC current is received at a neutral point-clamped multi-level voltage...
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7076206 |
System for wireless transmission of electrical power, a garment, a system of garments and method for the transmission of signals and/or electrical energy
The invention describes a system for electrical transmission in the field of garments and a corresponding transmitter for this. Electrical circuits in garments are coupled, preferably inductively...
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7072195 |
Modular AC voltage supply and algorithm for controlling the same
An AC power supply ( 10 ) can be connected in parallel with similar supplies to drive loads ( 16 ). Each of the AC power supplies ( 10 ) incorporates a discrete controller functioning based on...
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7045980 |
Power converter and vehicle equipped with power converter
A power source ( 120 ) supplies an input voltage (V 1 ). A voltage conversion circuit ( 130 ) converts the input voltage (V 1 ) from the power source ( 120 ) into an operating voltage (V 2 ) to be...
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