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| Number | Title | Issue Date |
| 8174855 | Power factor correction integrated circuit with critical conduction mode A power factor correction integrated circuit housed in an integrated circuit package for controlling a boost converter circuit having an input inductor coupled in series with a boost rectifier between a rectified AC line input voltage and a DC bus voltage, on a DC b... | 05/08/2012 |
| 8134849 | AC to DC power converter using an energy-storage capacitor for providing hold-up time function An AC to DC power converter with hold up time function has a charging switch and a mode switch. The charging switch is connected between an output capacitor of a PFC controlling circuit and an energy-storage capacitor. The mode switch is connected between the energy... | 03/13/2012 |
| 8130522 | Digital power factor correction A digital PFC (DPFC) control approach that requires no input voltage sensing or current loop compensation is described. The approach can provide stable, low-harmonic operation over a universal input voltage range and load ranging from high-load operation in continuo... | 03/06/2012 |
| 8130523 | Method and apparatus for setting a feedback power of a fundamental frequency clocked converter A method and an apparatus for setting a feedback power of a converter clocked at a fundamental frequency on the power supply side are disclosed. The converter includes a bridge circuit equipped with controllable semiconductor switches, wherein the semiconductor swit... | 03/06/2012 |
| 8125805 | Switch-mode converter operating in a hybrid discontinuous conduction mode (DCM)/continuous conduction mode (CCM) that uses double or more pulses in a switching period A switching converter controller and method for controlling a switch-mode converter in a hybrid discontinuous conduction mode (DCM)/continuous conduction mode (CCM) mode are disclosed. The hybrid mode involves using double (two) or more switching pulses in a switchi... | 02/28/2012 |
| 8098505 | Phase management for interleaved power factor correction An interleaved power factor correction (PFC) circuit includes phase management to control shedding and adding of channels. The channels may be voltage (e.g., boost) converters connected in parallel. The interleaved PFC circuit can have a first channel and a second c... | 01/17/2012 |
| 8094473 | Bridgeless power factor correction circuit There is provided a bridgeless power factor correction circuit that corrects a power factor by complementarily switching two switches according to phase of input power without using rectifier bridge diodes. A bridgeless power factor correction circuit according to a... | 01/10/2012 |
| 8085562 | Merged ramp/oscillator for precise ramp control in one cycle PFC converter A one cycle power factor correction converter circuit comprising a switch for controlling a DC output voltage of the converter circuit, the switch being switched by a drive signal having a frequency determined by a clock signal; the converter circuit being provided ... | 12/27/2011 |
| 8085563 | Protection and clamp circuit for power factor correction controller A controller generates a drive signal for a converter circuit that includes an active component (i.e., transistor) that is selectively controlled to convert a rectified input to direct current (DC) output. The controller employs an outer feedback loop (based on moni... | 12/27/2011 |
| 8072786 | Power supply module with power saving mode A power supply module is configured for converting an AC voltage to a first DC voltage and applying the first DC voltage to a load. The power supply module includes a rectifying and filtering unit, a PFC unit, a voltage transforming unit, an input port, and a switch... | 12/06/2011 |
| 8059433 | Power circuit and liquid crystal display using same An exemplary power circuit includes a first rectifying and filtering circuit, a power factor correction (PFC) circuit, an inverter circuit and a second rectifying and filtering circuit. The first rectifying and filtering circuit receives an AC voltage and transforms... | 11/15/2011 |
| 8040703 | Power factor correction controller with feedback reduction A power control system includes a feedback loop having a power factor correction (PFC) and output voltage controller and a switching power converter. The switching power converter includes an inductor to supply charge to an output capacitor and a switch to control i... | 10/18/2011 |
| 8036009 | Method for supplying and discharging power to and from a resistive-inductive load, and rectifier used therein Power is supplied to excitation windings in order to generate magnetic fields, preferably for activating superconducting coils. An AC transformer is used, and triggering of the coil is performed via a rectifier having little power loss. Preferably, a two-way rectifi... | 10/11/2011 |
| 8018747 | PWM rectifier Disclosed is a PWM rectifier in which switching losses in a semiconductor device are reduced without degrading the response of a control system. In a PWM overmodulation region, the modulation scheme is set to a three-phase modulation scheme. In other regions, a swit... | 09/13/2011 |
| 7940538 | Multi-voltage power supply A multi-voltage power supply includes a transformer, a first output circuit to generate a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller to control a voltage supplied to the primary w... | 05/10/2011 |
| 7903439 | Methods and apparatus to control a digital power supply Methods and apparatus to control a digital power supply are disclosed. An example method includes calculating a duty cycle of a pulse width modulated signal to control an output of a digital power supply, initializing an output of a counter that forms a pulse width ... | 03/08/2011 |
| 7903440 | Synchronous regulation circuit and method for providing synchronous regulation for power converters A synchronous regulation circuit is provided to improve the efficiency of the power converter. A primary-side switching circuit generates a synchronous signal and a switching signal. The switching signal is used for soft switching a transformer. A secondary-side swi... | 03/08/2011 |
| RE42161 | Power supply for light emitting diode array An apparatus (10) for supplying regulated voltage d.c. electrical power to an LED array (12) includes a rectifier (32) responsive to a.c. power for generating rectified d.c. power and a power factor correcting and voltage regulating buck/boost s... | 02/22/2011 |
| 7889526 | Cat-ear power supply having a latch reset circuit A cat-ear power supply is operable to generate a DC voltage and draws current from an AC power source near the beginning and end of a half-cycle of the AC power source. A controllably conductive switching circuit selectively charges an energy storage capacitor to pr... | 02/15/2011 |
| 7859872 | Load voltage-independent active power control of power converters The magnitude and wave shape of instantaneous power draw from a single phase alternating current power source to a power converter is controlled by a closed loop power control scheme independent of the direct current output voltage of the converter. A fast averaging... | 12/28/2010 |
| 7796411 | Universal three phase controllers for power converters The systems and methods described herein provide for a universal controller capable of controlling multiple types of three phase, two and three level power converters. The universal controller is capable of controlling the power converter in any quadrant of the PQ d... | 09/14/2010 |
| 7787271 | Power supply start-up and brown-out inrush management circuit A power supply device including a diode bridge, a converter module, and an inrush control module. The diode bridge is configured to rectify an input voltage. The converter module is coupled to the diode bridge and is configured to convert the input voltage into a di... | 08/31/2010 |
| 7778056 | Power converter with low loss switching A welding power supply includes an input rectifier that receives sinusoidal or alternating line voltage and provides a rectified voltage. A pre-regulator provides a dc bus and a convertor, such as a boost convertor, provides a welding output. The pre-regulator is an... | 08/17/2010 |
| 7768805 | Clean input UPS with fast rectifier control and improved battery life The present invention relates to the control of active rectifiers for UPS systems. Aspects of the present invention relate to a control algorithm that is implemented to realize a fast rectifier control operation that results in the improved life of a battery that is... | 08/03/2010 |
| 7733678 | Power factor correction boost converter with continuous, discontinuous, or critical mode selection In a method and apparatus for controlling power factor correction in mixed operation modes, a frequency of the input voltage is obtained by detecting the zero crossing points of the input voltage. A peak of the input voltage is obtained by detecting input voltage wi... | 06/08/2010 |
| 7719866 | Control circuit for a DC-to-DC switching converter, and the use thereof for maximizing the power delivered by a photovoltaic generator A control circuit for a switching DC/DC Converter comprising: an input for an indicator signal indicative of an output current level from said converter; a peak detector for detecting and storing a maximum value of said indicator signal; a comparator element for com... | 05/18/2010 |
| 7715216 | Powering circuit of AC-DC converter A powering circuit of an AC-DC converter, for converting a high AC input voltage into a low DC output voltage to provide a load voltage in a stable DC bias range, includes a rectifier, a sensing circuit, a control switching circuit, and a voltage regulating capacito... | 05/11/2010 |
| 7706161 | Single stage resonant power converter with auxiliary power source The improved single stage power converter circuit topology substantially reduces EMI that is conducted to the AC line, reduces input AC current inrush, improves output ripples by the use of an auxiliary supply near zero crossings of the line AC voltage, provides Pow... | 04/27/2010 |
| 7701736 | Synchronous rectifying circuit for resonant power converters A synchronous rectifying circuit is provided for resonant power converter. An integrated synchronous rectifier comprises a rectifying terminal, a ground terminal a first input terminal and a second input terminal. The rectifying terminal is coupled to the secondary ... | 04/20/2010 |
| 7675763 | Semiconductor power converter apparatus Even when one of IGBTs fails in a semiconductor power converter apparatus in which a plurality of semiconductor elements are connected in parallel, the remaining IGBT(s) is prevented from failing with a simple circuit configuration. The semiconductor power converter... | 03/09/2010 |
| 7660137 | High-voltage modulator system A high-power modulation system includes drive circuitry that receives input signals from the signal source via a series of transformers. The drive circuitry amplifies the input signals and provides the resulting amplified signals to the high-power switch. The switch... | 02/09/2010 |
| 7656692 | Method and apparatus for supplying and switching power An exemplary embodiment of an apparatus for supplying and switching power may include a power source, a transformer, a full bridge rectifier and a control switch. The transformer has a first winding and a second winding, the first winding being connected to the powe... | 02/02/2010 |
| 7633780 | Switching power supply apparatus with low loss synchronous rectification Disclosed is a synchronous rectification type switching power supply apparatus, including: a transformer that receives input voltage on a primary side; a switching element that is to be turned on or off for rectifying current of a secondary coil of the transformer; ... | 12/15/2009 |
| 7596009 | Double-ended isolated DC-DC converter In a double-ended isolated DC-DC converter, by using a main transformer and first and second pulse transformers, a first power switch of a primary side circuit and a first synchronous rectifier of a secondary side circuit are driven with complementary timing, and a ... | 09/29/2009 |
| 7580272 | Power source apparatus A boost chopper circuit converts AC power to DC voltage and supplies the DC voltage to a load. The boost chopper circuit includes a switching element and a reactor. A controller ON/OFF controls the switching element based on a comparison result in an interval of the... | 08/25/2009 |
| 7564705 | Synchronous rectification circuit for power converters A synchronous rectification circuit for power converters operable under fixed and/or variable frequencies where no current sense circuit or phase-lock circuit are needed is provided. It has a power switch coupled to a transformer for the rectification. A signal-gene... | 07/21/2009 |
| 7551462 | Soft switching DC-DC converter including a buck converter and a boost converter sharing a common transformer A soft switching DC-DC converter is provided which includes circuitry for both a buck converter and a boost converter. The buck converter circuitry and the boost converter circuitry share a common transformer including a primary coil and first and second secondary c... | 06/23/2009 |
| 7551463 | AC/DC converter with low harmonic currents This AC/DC converter is an isolated converter with switch-mode current regulation by means of a controlled switch (5). The controlled switch (5) is protected by a current limiting device (9, 7) obeying a peak current setpoint proportional to the... | 06/23/2009 |
| 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 from the control device. The semiconductor switch has feed voltage-moni... | 05/19/2009 |
| 7532494 | Power supply unit Embodiments of the invention provide a power supply unit that operates in a standby mode and in a normal mode. The power supply unit comprises a first power supply providing output voltages during the standby mode and a second power supply providing output voltages ... | 05/12/2009 |
