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| Number | Title | Issue Date |
| 8045351 | Method and apparatus of providing a biased current limit for limiting maximum output power of power converters A biased current-limit circuit for limiting a maximum output power of a power converter includes an oscillator for generating a pulse signal. A waveform generator generates a waveform signal in response to a switching signal and a second-sampling signal. A sample-ho... | 10/25/2011 |
| 8040704 | Integrated magnetics switching converter with zero inductor and output ripple currents and lossless switching Switching Converter with a novel two-loop Integrated magnetic structure integrates transformer and two output inductors and eliminates large circulating current in the transformer secondary side resulting in ultra high efficiency and zero ripple output current as we... | 10/18/2011 |
| 8018748 | Method and system to convert direct current (DC) to alternating current (AC) using a photovoltaic inverter A method to convert direct current (DC) power generated by a photovoltaic (PV) arrays to alternating current (AC) power using a PV inverter, the method includes: applying the DC power generated the PV array to the PV inverter; boosting the DC power from the PV array... | 09/13/2011 |
| 7965528 | Method and apparatus for measuring the switching current of power converter operated at continuous current mode An apparatus for detecting a switching current of the power converter, wherein the apparatus includes a signal generation circuit, a sample-and-hold circuit, and a calculating circuit. The signal generation circuit generates a sample signal in accordance with the pu... | 06/21/2011 |
| 7944722 | Switch mode power supply controller with feedback signal decay sensing This invention relates to SMPS controllers employing primary side sensing. We describe a system for identifying a knee point in a sensing waveform, at which the output voltage of the SMPS may be sampled accurately on the primary side. The system identifies the knee ... | 05/17/2011 |
| 7940539 | Single-phase full bridge boost converter systems and methods Single-phase full bridge boost converter systems and methods are provided. One system includes a direct-quatrature (D-Q) control system configured to generate a control voltage (vcon) including direct-phase and quadrature-phase voltage components. The sys... | 05/10/2011 |
| 7929327 | Alternative-source energy management A power converter system includes a power converter system including: a DC-to-AC power converter; a first output configured to be coupled to a power grid; a first input configured to be coupled to the power grid; second outputs each configured to be coupled to a cor... | 04/19/2011 |
| 7894222 | 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 a power supply. A controller to generate a drive signal is coupled to... | 02/22/2011 |
| 7876587 | Method and apparatus providing a multi-function terminal for a power supply controller A method for controlling a power supply is disclosed. An example method includes deactivating the power supply in response to a first current through a first terminal of a power supply controller falling below a first threshold value. The power supply is activated i... | 01/25/2011 |
| 7859873 | Operation control circuit It is an object of the present invention to provide an operation control circuit without using a photo-coupler. The operation control circuit controls the operation of an LED in a DC/AC inverter comprising a voltage conversion circuit, a DC/AC conversion circuit for... | 12/28/2010 |
| 7855905 | Digital power supply controller with integrated microcontroller A digital power supply controller is disclosed for controlling the operation of a switched power supply. The controller is contained within an integrated circuit package enclosing an integrated circuit chip. A plurality of inputs are provided on the package for inte... | 12/21/2010 |
| 7852647 | Switching power supply digital control circuit protecting from magnetic saturation effects A switching power supply apparatus includes a transformer or an inductor, a switching element connected to the transformer or the inductor and configured to perform switching of an input power supply, and a switching control circuit including a digital control circu... | 12/14/2010 |
| 7852646 | Instantaneous load current control scheme for voltage fed DC to AC inverter supplying resistive-inductive load A control system is provided for controlling varying alternating current (AC) to a load with varying resistance and inductance. A plurality of nested control loops may employ cascaded proportional controllers to provide desired control of a pulse width modulation (P... | 12/14/2010 |
| 7843713 | Method of driving DC/DC converter, and DC/DC converter When the three U-, V-, W-phase arms of a DC/DC converter are turned on, they are alternately turned on by gate drive signals. When the U-, V-, W-phase arms are alternately turned on, an upper arm switching device of the U-phase arm, for example, is turned on, and th... | 11/30/2010 |
| 7782640 | Inverter circuit and backlight unit having the same An inverter circuit according to an embodiment includes an input unit to which a first voltage is applied. In the inverter circuit, a transformer transforms the first voltage output from the input unit, and a first switching unit switches an on/off state of the tran... | 08/24/2010 |
| 7760526 | Method and device for the control of a three-phase inverter A method of controlling an inverter to includes determining the components of a phasor representing the output current from the inverter in a fixed reference system; determining the components of the current phasor in a reference system rotating at a velocity equal ... | 07/20/2010 |
| 7755917 | Modulation of a feedback signal used in a digital control of a switching regulator Digital control of a switching regulator in one aspect includes a compare circuit to be coupled to receive a feedback signal representative of an output level of a power supply. A feedback state signal is generated having a first feedback state and a second feedback... | 07/13/2010 |
| 7715217 | Voltage conversion device and vehicle A DC/DC converter includes a reactor, IGBT devices, a dead time generation unit, and a DC-CPU. The dead time generation unit operates in response to a reference signal for a duty ratio, to output first and second activation signals provided with an inactive period c... | 05/11/2010 |
| 7710753 | Switch mode power supply controller with feedback signal decay sensing This invention relates to SMPS controllers employing primary side sensing. We describe a system for identifying a knee point in a sensing waveform, at which the output voltage of the SMPS may be sampled accurately on the primary side. The system identifies the knee ... | 05/04/2010 |
| 7643321 | Bi-directional current sensing circuit A current sensing circuit that determines an output current of a bi-directional converter circuit comprises a current transformer that receives a first current signal and that outputs a second current signal. The first current signal is indicative of the output curr... | 01/05/2010 |
| 7633781 | AC power supply and method for controlling output current thereof An AC power supply and a method for dynamically controlling the output current thereof are disclosed. An output voltage stop signal is used to disable a DC/AC converter from outputting. During a period that the DC/AC converter stops its output, the output current of... | 12/15/2009 |
| 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 a power supply. A controller to generate a drive signal is coupled to... | 09/22/2009 |
| 7583522 | Low audible noise power supply method and controller therefor A power controller forms drive pulses that reduces audible noise under light load conditions. ... | 09/01/2009 |
| 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 comprise an electronic power inverter, such as one usable with an uninte... | 06/09/2009 |
| 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 series to primary coils of corresponding balancer-transformers, and the... | 04/07/2009 |
| 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 of forming consecutive voltage pulses to the load by using the inver... | 03/24/2009 |
| 7502241 | Inverter startup algorithm A method for the startup of a solar power inverter in which a waiting period is increased between successive attempts to start the inverter. This method allows the inverter to start up in a reasonable amount of time while avoiding excessive cycling during prolonged ... | 03/10/2009 |
| 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 V1 detected in a voltage detection circuit, driving of each b... | 03/10/2009 |
| 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 switch on and off within a switching cycle. The switching cycle has a ... | 12/30/2008 |
| 7436686 | Reconfigurable voltage inverter with tolerance to failures Voltage inverter provided with four switching cells (Q1 to Q4) to be connected to the terminals of a DC voltage source (Vdc), each comprising two semiconductor switches (I11, I12, I21, I22, I31, I32, I41... | 10/14/2008 |
| 7433211 | 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 switching mode. Under the peak current switching mode, a switch controller ... | 10/07/2008 |
| 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 in a reasonable amount of time while avoiding excessive cycling durin... | 10/07/2008 |
| 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 output of the switching converter and digitally processing the analog... | 09/23/2008 |
| 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 including a transformer having the auxiliary winding. A voltage waveform... | 09/16/2008 |
| 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 condition of the switching power converter. The programming of the plurality... | 08/26/2008 |
| 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 fault in the utility grid, the method includes decoupling the AC signal f... | 08/26/2008 |
| 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 switch and a lower semiconductor switch and subjected to a service volta... | 08/26/2008 |
| 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 voltages to a commercial electric power system with ease, and which enab... | 05/13/2008 |
| 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) serial link transmitter, in which two branches of parallel transistors eac... | 05/06/2008 |
| 7368883 | Apparatus for end-of-life detection of fluorescent lamps In fluorescent lamp lighting, it is required that when the lamp reaches its end of life there has to be some mechanism to shut down the power supply to the lamp for safety. In the present invention, an apparatus is proposed to fulfill this requirement. This inventio... | 05/06/2008 |
