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7616457 |
Synchronous regulation circuit
A primary-side switching circuit generates switching signals for switching a transformer. A secondary-side switching circuit is coupled to an output of the power converter to generate pulse signals...
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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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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...
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7586764 |
Synchronized rectifier filter control device for protecting a power supply from reverse current
A rectifier filter control device for a power supply that includes: A saturable inductor (swing choke), capacitors; and rectifiers connected to a rectifier filter circuit. The rectifier filter...
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7583109 |
Apparatus and methods for monitoring parallel-connected power switching devices responsive to drive circuit parameters
An apparatus, such as an inverter or rectifier in a double-conversion UPS, includes a plurality of power switching devices, such as IGBTs, coupled in parallel. A drive circuit is coupled to the...
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7564706 |
Power factor corrected single-phase AC-DC power converter using natural modulation
A power factor corrected (pfc) ac-dc converter has a modified boost input and a modified buck output. Unlike the prior art boost input, the boost switch returns to the output, not to ground. Unlike...
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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...
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7548442 |
Power converter with coupled inductor
A power converter has simple coupled inductor circuit process the power and drive the semiconductor switch perfectly to reduce the power loss and eliminate the needs of high circuit complexity...
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7542315 |
Active rectifier
A voltage signal rectifier produces a rectified voltage signal from an input offset voltage signal. The voltage signal rectifier includes input offset, output, and reference nodes, two actively...
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7542309 |
Voltage stabilizer circuit of forward converter
A voltage stabilizer circuit of forward converter is disclosed to include a transformer, a first switch, a rectifier, an error amplifier, a control circuit, and a driving circuit. The control...
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7525822 |
DC converter including a tertiary winding for driving synchronous rectifiers
A DC converter has a transformer with loosely coupled primary and secondary windings, a main switch connected in series with the primary winding of the transformer, and a series circuit connected...
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7518895 |
High-efficiency power converter system
In one embodiment, a power converter system includes a first input terminal and a second input terminal operable to connect to an alternating current (AC) power source, and an output terminal at...
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7515439 |
Low voltage stress power converter
A circuit used to convert a DC input to an AC output comprises a pair of series circuits, one or two capacitors, and one transformer. Each of the series circuits is in parallel with the DC input...
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7511466 |
Method and apparatus for predicting discharge time of magnetic device for power converter
A method and apparatus for predicting the discharge time of magnetic device are provided. A switching circuit generates a switching signal and an auxiliary signal. The switching signal is used to...
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7499300 |
Self-driven synchronous rectification and voltage stabilization circuit
A synchronous rectification and voltage stabilization circuit includes a saturable inductance coil (L 1 ), a synchronous rectifier switch ( 33 ), a driving coil (L 2 ) for turning on the...
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7499299 |
Method and apparatus for reducing body diode conduction of synchronous rectifiers
A circuit for controlling the operation of synchronous rectifiers. The circuit delays the turn-off of the synchronous rectifiers in accordance with the load current. The magnitude of the load...
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7495940 |
Method and device for producing rectifier gating signals using a peak detector
A device that includes an active rectifier ( 14 ) having control gates controllable to produce an output voltage on a DC bus ( 20 ), a gate control circuit ( 16 ) for producing gate control signals...
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7492138 |
Synchronous rectifier circuits and method for utilizing common source inductance of the synchronous FET
A method of improving the operation of a synchronous rectifier circuit which includes a switching transistor and synchronous transistor, by providing an operatively effective value of inductance in...
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7471524 |
Isolated DC-DC converters with high current capability
A DC-to-DC converter having a transformer with a primary and a tapped secondary, two serial output filter inductors connected parallel with the secondary, a center output filter inductor connected...
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7447051 |
Synchronous multi-phase AC-to-DC converter
Disclosed herein are various embodiments of power conversion systems and methods employing synchronous multi-phase AC-to-DC conversion. In one embodiment, a power converter comprises a transistor...
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7440299 |
Control of a MOS transistor as rectifying element
A circuit for controlling a switch to be controlled in unidirectional fashion while the voltage present thereacross is an A.C. Voltage, including circuitry for delaying the switch turning-on with...
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7436684 |
DC/DC-rectifier with reduced losses
A DC/DC-rectifier includes a transformer and a primary side bridge. The primary side bridge comprises a first pair of switches and a second pair of switches, and a secondary side bridge also...
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7408796 |
Integrated synchronous rectifier package
An integrated synchronous rectifier package comprising a controlled switching device having two main current carrying terminals and a control terminal, a control circuit for sensing the direction...
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7400519 |
Switching power supply
A switching power supply comprises one or more switching sections which repeat ON/OFF operation, a transformer having a primary winding and a secondary winding, a synchronous rectifier section for...
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7397290 |
Method and relative circuit for generating a control voltage of a synchronous rectifier
A control voltage for a synchronous rectifying transistor is generated with the desired anticipation time. The anticipation time is continuously controlled with a closed-loop technique by comparing...
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7385832 |
Method of forming a secondary-side controller and structure therefor
In one embodiment, a secondary-side controller is configured to detect a burst-mode of operation and responsively block or prevent sending drive pulses to a power transistor that is coupled in the...
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7375988 |
Self-synchronized high voltage synchronous rectifier and drive
This invention describes a method for using self-synchronized (also known as self-driven), synchronous rectifiers in converters employing high output voltages or conversely, in converters with wide...
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7372711 |
Circuit and method for reducing voltage spikes due to magnetizing current imbalances and power converter employing the same
For use in a power converter having parallel power trains, a circuit for, and method of, reducing voltage spikes due to magnetizing current imbalances in the power trains and a power converter...
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7372710 |
Switching power source device of the type capable of controlling power loss in generating output voltage from a secondary winding of a transformer
A switching power source device is provided which comprises a secondary MOS-FET 9 connected between a secondary winding 6 of a transformer 2 , a reactor 11 connected in parallel to secondary...
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7345896 |
Secondary side power supply controller and method therefor
In one embodiment, a power supply controller generates a PWM control signal that is subsequently used to control a portion of current flow in a primary side of a power supply system. THE PWM...
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7333350 |
Self driven synchronous rectifier shutdown circuit and method
There is disclosed a power conversion circuit comprising a transformer having a primary side driven by an input section and a secondary side connected to first and second self-driven synchronous...
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7285930 |
Method and device for controlling a multiphase electronically commutated motor
A method is specified for controlling a multiphase motor that is commutated by an inverter-side bridge circuit, in the course of which a particularly precise and technically simple detection of a...
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7279877 |
Adaptive current reversal comparator
An adaptive current reversal comparator for synchronous switching regulator comparison circuit for use in a switching regulator is provided. The comparison circuit includes a voltage offset that is...
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7265525 |
Self-driven scheme for synchronous rectifier having no body diode
A voltage converter uses a component such as a JFET or four-terminal power MOSFET having no body diode and exhibiting no body diode conduction characteristic as a synchronous rectifier to reduce...
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7257010 |
Power supply circuit
A power supply circuit comprises a bridge circuit that has four rectifier elements connected and produces a rectified voltage between a positive side output terminal and a negative side output...
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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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7245514 |
Synchronous rectification circuit
A synchronous rectification circuit of a switching power supply device where circuit elements such as rectification switch elements are protected when an abnormality occurs in an output of a...
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7242597 |
Rectifier circuit and vision regeneration assisting apparatus having the same
A rectifier circuit for converting an AC voltage to a DC voltage has a first MOS transistor having a source connected to a first input terminal of an AC power supply, and also having a drain...
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7230838 |
Active damping control for a switch mode power supply
Methods and apparatus are disclosed for suppressing circuit noise due to parasitic elements in switch mode power supplies. The presented embodiments use actively controlled damping devices such as...
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7221127 |
Alternator with rectifier bridge in particular for motor vehicle
The alternator comprises a wound rotor and a stator with a number of phases connected to a rectifier bridge equipped with switches ( 7 ) in the form of MOS type transistors, such as MOSFET type...
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7212418 |
Synchronous rectifier control circuit
A synchronous rectifier control circuit improves energy conversion efficiency and uses a signal produced by a secondary winding of a transformer in a rectifier circuit to control a low-impedance...
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7212416 |
Switching power supply device and switching method
A current flowing through a reactor flows through a resistor, which generates a voltage in accordance with the value of the current. As the voltage generated by the resistor is greater than or...
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7206208 |
Synchronous rectifying control circuit
A synchronous rectifying control circuit for utilizing in a forward topology of rectifying circuit. The circuit controls a first current switch and a second current switch provided on both ends of...
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7196920 |
Synchronous rectifier drive circuit for low output voltage active clamp forward converter
A drive circuit for a synchronous rectifier has a transformer having a main secondary winding and an auxiliary secondary winding. A first switch and a second switch each have a pair of terminals, a...
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7196913 |
DC conversion apparatus
A DC conversion apparatus includes a switch converting a DC voltage of a DC power source to a high-frequency voltage by being turned ON/OFF via a primary winding of a transformer, a series circuit...
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7184280 |
LLC series resonant converter and the driving method for the synchronous rectification power switches thereof
An LLC series resonant converter and a driving method for the synchronous rectification power switches thereof are provided. The LLC series resonant converter includes a bridge circuit, a resonant...
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7180762 |
Cascoded rectifier
A high voltage rectifier device exhibiting low forward resistance and fast switching time formed of a high voltage structure connected in a cascode configuration with a low voltage structure. The...
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7180270 |
Frequency converter for high-speed generators
The present invention relates to a method and to a device for adapting the alternating current generated by a generator ( 1 ) and the alternating voltage generated by a generator ( 1 ) to a grid (...
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7173835 |
Control circuit associated with saturable inductor operated as synchronous rectifier forward power converter
A circuit for synchronous rectifying is provided for forward power converter. A secondary winding of a transformer includes a first terminal and a second terminal for generating a switching...
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7170768 |
Integrated rectifying element
A controllable rectifying element, comprising a bipolar transistor having a current input terminal connected to a control terminal by a first switch and having a current output terminal connected...
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