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US20110122658 POWER CONVERTER USING ENERGY STORED IN LEAKAGE INDUCTANCE OF TRANSFORMER TO POWER SWITCH CONTROLLER  
The power converter includes a transformer that is coupled or decoupled from a power source by a switch controlled by a switch controller. The transformer includes a first primary winding coupled...
US20110267848 POWER CONVERTER  
Reduction of power loss and operation in a two-phase mode are made possible. The power converter of present invention is a power converter composed of a core formed by a magnetic material and a...
US20110157923 CIRCUITS AND METHODS FOR CONTROLLING POWER CONVERTERS INCLUDING TRANSFORMERS  
A power converter includes a transformer operated in multiple switching cycles. At least one switching cycle includes a charging period, a discharging period, and an adjusting period. The...
US20110149613 FLYBACK CONVERTER UTILIZING BOOST INDUCTOR BETWEEN AC SOURCE AND BRIDGE RECTIFIER  
A flyback converter utilizes a boost inductor coupled between a source of AC power and a bridge rectifier to provide power factor correction. A primary winding of the flyback transformer is coupled...
US20120026757 CONVERTER CONTROLLER  
Provided is a converter controller capable of preventing destruction of an element such as an auxiliary switch by preventing operation interference between auxiliary circuits of respective phases...
US20110096572 LOW POWER CONSUMPTION START-UP CIRCUIT WITH DYNAMIC SWITCHING  
A start-up circuit in a switch-mode power converter that employs a Zener diode to provide a reference voltage to reduce the power consumption and the size of the start-up circuit. The start-up...
US20120114009 FORWARD-FLYBACK POWER SUPPLY USING AN INDUCTOR IN THE TRANSFORMER PRIMARY AND METHOD OF USING SAME  
A power supply (300) includes a rectification means (303) for providing a voltage from an AC mains input (301). An inverter (307) is used for supplying a switched AC voltage at high frequency from...
US20110222319 SWITCHING POWER SUPPLY  
A switching power supply includes a first auxiliary power supply for causing a first auxiliary winding of a transformer to induce voltage by ON/OFF control of a switching element connected to a...
US20110058396 FLYBACK-TYPE INVERTER CIRCUIT FOR NETWORK SUPPLY OR FOR NETWORK-INDEPENDENT OPERATION  
An inverter circuit for supplying solar power or wind power to a network or for network-independent operation. The inverter circuit includes a minimum number of components and can therefore be kept...
US20110182088 QUASI-RESONANT POWER SUPPLY CONTROLLER AND METHOD THEREFOR  
In one embodiment, a quasi-resonant power supply controller is configured to select particular valley values of a switch voltage to determine a time to enable a power switch. The valleys values are...
US20110103101 INTEGRATED CONTROL CIRCUIT FOR CONTROLLING A SWITCHING POWER SUPPLY, SWITCHING POWER SUPPLY INCORPORATING THE SAME, AND A METHOD OF CONTROLLING A SWITCHING POWER SUPPLY  
An integrated control circuit for controlling a switching power supply, a switching power supply incorporating the same, and a method of controlling the switching power supply, where the control IC...
US20080304293 Converter controller  
A converter controller is disclosed. In one embodiment, a controller for a flyback converter includes a converter and a flyback controller. The converter is coupled to the flyback converter for...
US20120113688 Interleaved flyback converter device with leakage energy recycling  
An interleaved flyback converter device with leakage energy recycling includes: two flyback converters and an input power. Each flyback converter includes a capacitor, a switch, two diodes, and a...
US20110286247 SENSING ARRANGEMENTS  
A sensing arrangement and method a sense winding is used to provide a voltage which represents the voltage appearing across an in-circuit magnetic component. In a flyback phase, when the component...
US20120069609 METHOD FOR LOWERING POWER LOSS AND CIRCUIT  
A method and circuit for suppressing a bias current and decreasing power consumption. A current suppression circuit is coupled to a circuit element, which is capable of conducting the bias current....
US20110063878 POWER-SUPPLY CONTROLLER  
An embodiment of a controller for a power supply includes circuitry that is operable to allow the power supply to operate as follows. During a first portion of a supply period, a first current...
US20120039096 High Voltage Startup Circuit  
In one embodiment, a startup circuit for a power supply is provided. The startup circuit comprises a resistance coupled between a voltage source and a first node. A first capacitor, coupled to the...
US20110090715 ISOLATED SWITCHING POWER SUPPLY APPARATUS  
A transformer includes a first secondary winding, a second secondary winding, and a third secondary winding. The second secondary winding and the third secondary winding are wound to include the...
US20100296319 POWER SOURCE MODULE WITH BROAD INPUT VOLTAGE RANGE  
The present invention discloses a power source module with a broad input voltage range, which includes a first and a second power source input terminals, a rectification filter circuit, and a...
US20080304292 ISOLATED HIGH POWER BI-DIRECTIONAL DC-DC CONVERTER  
A bi-directional dc-dc converter is provided that may provide voltage conversion for two separate electrical power systems. The two electrical power systems may have different functions, electrical...
US20110194311 PHASE ANGLE MEASUREMENT OF A DIMMING CIRCUIT FOR A SWITCHING POWER SUPPLY  
An example controller for a switched mode power supply includes a zero-crossing detector, a feedback reference circuit, and a drive signal generator. The zero-crossing detector is coupled to...
US20120020122 LOSSLESS COMMUTATION DURING OPERATION OF A POWER CONVERTER  
A method for operating a DC-DC converter. The method comprises: matching, based on a turns ratio of a transformer of the DC-DC converter, a primary side capacitance of the DC-DC converter and a...
US20110182089 Controller for a Power Converter and Method of Operating the Same  
A controller for a power converter and method of operating the same. In one embodiment, the controller includes a primary peak current circuit configured to produce a reference voltage...
US20100027297 Step-Up Converter Systems and Methods  
Methods and systems with a step-up converter are provided based on a boost converter. In one aspect, a step-up converter includes: a boost converter having a first inductor; a second inductor...
US20100315843 METHOD OF DETECTION FOR OUTPUT SHORT CIRCUIT OF A FLYBACK POWER SUPPLY  
Disclosed are methods of detection for output short circuit of a flyback power supply, which detect the current sense signal provided by a current sense resistor serially connected to a power...
US20110235371 Constant-current circuit capable of voltage compensation and zero-voltage switching  
The present invention is to provide a constant-current circuit capable of voltage compensation and zero-voltage switching, wherein the constant-current circuit is a single-switch isolated flyback...
US20090196075 FLY-FORWARD CONVERTER POWER SUPPLY  
A fly-forward converter topology for a switched-mode power supply (SMPS) that may incorporate the advantages of both a forward converter and a flyback converter into a two-stage half-wave converter...
US20110292690 Multi-winding high step-up DC-DC converter  
A multi-winding high step-up DC-DC converter includes a three-winding transformer to transform a low DC voltage to a high DC voltage; a power switch to control the energy flux of the primary...
US20120092902 PHASE ANGLE MEASUREMENT OF A DIMMING CIRCUIT FOR A SWITCHING POWER SUPPLY  
An example controller for a switched mode power supply includes a zero-crossing detector and a drive signal generator. The zero-crossing detector is coupled to generate a zero-crossing signal...
US20080088248 CIRCUITRY FOR SUPPLYING ELECTRICAL POWER TO LOADS  
A power supply, comprising a boost converter which provides voltage to a first load, and a flyback converter which provides voltage to a second load and which utilizes an inductive element of the...
US20100226151 POWER CONVERSION CIRCUIT AND PORTABLE POWER SUPPLY HAVING SUCH POWER CONVERSION CIRCUIT  
A power conversion circuit includes a flyback DC-to-DC converter, a capacitor and a DC-to-AC converter. The flyback DC-to-DC converter is used for receiving an input DC voltage and converting the...
US20100195355 SWITCHING POWER CONVERTER WITH LOAD IMPEDANCE DETECTION  
In a switching power converter, no-load condition is detected based on a variety of parameters including the output current, primary current, transformer reset time, and switching period. Once the...
US20100321961 INSULATION TRANSFORMER AND KEY INPUT CIRCUIT HAVING THE SAME  
An insulation transformer and a key input circuit having the same are disclosed. The insulation transformer includes: a core having a certain gap; and primary and secondary coils wound on the core....
US20070121351 DC-DC FLYBACK CONVERTER HAVING A SYNCHRONOUS RECTIFICATION SELF-DRIVEN CIRCUIT  
A DC-DC flyback converter, includes a three-winding transformer; a primary power circuit having a first MOSFET connected to a first winding of the transformer; a secondary power circuit connected...
US20080117655 Spike converter  
The present invention is a spike converter providing a special mode of operation of a low power fly-back converter in a very narrow duty cycle range in particular. This spike operation minimizes...
US20110188270 CIRCUIT  
A circuit comprising a power factor correction stage having a DC input, a ground input, a DC output and a ground output; a capacitor; a diode; and discharge means. A first terminal of the diode is...
US20120081929 High Efficiency and Low Cost High Voltage Power Converter  
A low cost, high efficiency, high voltage DC to DC power converter that operates from batteries to provide support to products using Electric Field Effect Technology to generate aerosols.
US20090122579 MIXED FLYBACK-FORWARD TOPOLOGY CONVERTER WITH REDUCED RIPPLE CURRENT  
A mixed flyback-forward topology converter includes a transformer having a core, a primary winding, a first secondary winding and a second secondary winding. A switch connects power to the primary...
US20100308733 APPARATUS AND METHOD FOR CONSTANT POWER OFFLINE LED DRIVER  
A single-stage integrated circuit drives LED sources in a constant power mode to eliminate the need for LED current sensing, while reshaping the waveform of the inductor current near line zero...
US20110051464 Compensation Device For Synchronous Rectifier Control And Method Thereof  
The configurations of a compensation device configured in a circuit having a synchronous rectifier (SR), a controller and a load, and a compensation method thereof are provided in the present...
US20100061125 Flyback boost circuit and strobe device using the same  
A flyback boost circuit includes an output voltage detection terminal provided to a secondary winding of a transformer of the flyback boost circuit, and configured to detect an output voltage....
US20120051098 METHOD AND APPARATUS FOR POWER CONVERTER FAULT CONDITION DETECTION  
An example controller includes a feedback circuit coupled to provide feedback information representative of an output of the power converter during at least a portion of an OFF time of a power...
US20070159856 Flyback power converter with split primary winding transformer  
A flyback power converter includes a transformer having a first primary winding and a second primary winding. The first primary winding is coupled to the positive supply rail. The second primary...
US20110194312 METHOD AND APPARATUS FOR DETERMINING ZERO-CROSSING OF AN AC INPUT VOLTAGE TO A POWER SUPPLY  
An example controller for a switched mode power supply includes a drive signal generator and a zero-crossing detector. The drive signal generator is to be coupled to control switching of a switch...
US20100302816 SWITCHING MODE POWER SUPPLY WITH A SPECTRUM SHAPING CIRCUIT  
In accordance with the teachings described herein, systems and methods are provided for a switching mode power supply. In one example, the switching mode power supply may include a transformer, a...
US20110194313 ACTIVE SNUBBER CIRCUIT AND POWER SUPPLY CIRCUIT  
An active snubber circuit for a switching power supply, in which a main switching element repeatedly operates an on-off operation so that current intermittently flows in a primary coil, has a...
US20100165671 Switched-mode Power Supplies  
This disclosure relates to switched-mode power supplies, to transformers for such power supplies, and to methods of operating switched-mode power supplies. A switch mode power supply (SMPS), the...
US20100232185 POWER SUPPLY MODULE  
A power supply module includes an AC/DC converter, a voltage transforming circuit, a feedback circuit, and a detecting circuit. The AC/DC converter is used for converting the input AC voltage to a...
US20110090718 SWITCHING POWER SUPPLY DEVICE  
The present invention has as an object to introduce a switching power supply device having a simple circuit structure and controlling a secondary-side output voltage in a highly-accurate and stable...
US20110013425 High step-up ratio soft-switched flyback converter  
A converter circuit includes a transformer having a first side and a second side. The converter circuit also includes a switch coupled to the first side of the transformer. The converter circuit...
Matches 1 - 50 out of 126 1 2 3 >