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7554823 |
Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses
A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary...
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7463500 |
Monopolar DC to bipolar DC to AC converter
An electrical DC-to-AC power conversion apparatus is disclosed that is primarily intended for use with solar photovoltaic sources in electric utility grid-interactive applications. The invention...
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7423890 |
Push-pull converter, in particular for driving cold-cathode fluorescent lamps
A push-pull converter has a transformer provided with a primary winding and a secondary winding. A capacitive element is connected between the input terminals of the primary winding, and two switch...
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7405544 |
Voltage regulating circuit for uninterruptible power supply
A voltage regulating circuit has a first switch, a transformer and a second switch. The first switch has an input node, a first node and a second node. The transformer is connected to the switches...
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7271546 |
Lighting device for dielectric barrier discharge lamp
This invention aims to decrease the leakage current of a dielectric barrier discharge lamp, and to prevent generation of the luminance slope between both electrodes. Electrodes 3 and 4 are...
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7254048 |
Power supply capable of AC and DC input utilizing winding of transformer as boost inductor
A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the...
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7248488 |
DC-AC converter, and method for supplying AC power
First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to...
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7173380 |
Push-pull driver with null-short feature
A push-pull driver for powering fluorescent lamps in a backlight system includes a transformer with three primary windings to realize the advantages of both a push-pull switching topology and a...
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7148659 |
Programmable AC/DC power supply
A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the...
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7126831 |
DC-AC converter, and method for supplying AC power
First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to...
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7088601 |
Power conversion apparatus and methods using DC bus shifting
A power converter apparatus, such as a double-conversion or line-interactive UPS, includes first and second DC voltage busses and a polyphase DC to AC converter circuit coupled to the first and...
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7046526 |
DC-AC converter, and method for supplying AC power
First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to...
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7016209 |
Single stage AC/DC converter with piezo transformer
A single stage AC/DC converter with piezo transformer is provided. The AC/DC converter is suitable for converting an AC power into a DC power and is comprised of a rectification module, a switching...
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6967852 |
Power converter with dynamic current limiting
An electrical power converter receives input power of one type or level at input terminals and supplies output power of another type or level at output terminals. The power converter includes a...
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6963497 |
Power converter with an inductor input and switched capacitor outputs
A power converter circuit has an inductor input and switching means to put a pair of capacitors alternately in series or in parallel. By pulse width modulating between the states, the voltage on...
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6807072 |
Electric power conversion device with push-pull circuitry
An electric power conversion device comprises switching elements 2 a , 2 b making up a push-pull converter, a pulse transformer T, a rectification diode D 1 , a rectification diode D 2 , a choke...
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6754091 |
Pulse width modulated push-pull driven parallel resonant converter with active free-wheel
An apparatus and method for high frequency alternating power generation to control kilowatts of supplied power in microseconds. The present invention includes a means for energy storage, push-pull...
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6744643 |
Push-pull booster circuit with a pair of inductors for coupling
A modified push-pull booster circuit is proposed, wherein two alternately switching transistors are disposed on the primary winding of a transformer, and a bridge rectifier and a charging circuit...
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6567281 |
Individual or distributed non-saturating magnetic element(s) power converters and multi-stage converters
Single, multistage, and distributed magnetic switched and tank resonant power conversion systems utilizing NSME. The NSME provide, superior protection to conducted lightning transients, superior...
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6534949 |
Motor drive converter and method with neutral point drift compensation
A high power motor drive converter comprises: a three level neutral point clamped (NPC) output power conversion stage including switches for supplying power to an AC drive motor; a split series...
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6518711 |
Halogen lamp electronic transformer
A halogen lamp electronic transformer a power supply circuit, a voltage divider circuit, a control circuit, inductive coils, a push pull oscillator circuit, and a triggering and overload protection...
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6472827 |
Parallel-resonant inverter-type fluorescent lamp ballast
A push-pull inverter is supplied from an inductively current-limited DC voltage source by way of a center-tap on a transformer having significant inductance. This transformer inductance is...
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6466457 |
Two switch wide range converter
The present invention provides a power converter and a method for converting power. The power converter comprises an inductor, a transformer, first and second switches, a diode, and a full bridge....
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6462966 |
Power supply circuit and method
A power supply ( 10 ) has a first transistor ( 20 ) coupled for switching a coil current (I l9 ) in response to a first control signal (V C1 ). A second transistor ( 30 ) has a body diode ( 32 )...
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6324080 |
Method and apparatus for energy conversion utilizing circuit phase and time variables
A conversion apparatus having transistors, comprising means for inverting a DC voltage in order to obtain an AC voltage, means for filtering the AC voltage, including at least one parallel inductor...
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6314006 |
DC/DC converter
In a DC/DC converter for producing a DC voltage from a supplied DC voltage with a reversible direction of action, a transformer operating in push-pull on the primary and secondary sides, the...
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6288913 |
High voltage power supply allowing transformers to be run in parallel for higher output power
A power supply for achieving high output power levels at a high efficiency from a compact profile. The power supply includes a current regulator which receives a source voltage and outputs a signal...
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6285173 |
Method to switch MOSFETs using recycled, parasitic energy
An energy efficient gate drive technique for binary push-pull MOSFET switching systems having a common switch node with inductive and capacitive elements connected to this common switch node. These...
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6272026 |
Pseudo push-pull DC:DC power converter topology
A pseudo-push-pull DC:DC converter topology replaces one primary switching transistor with a high speed passively switched diode coupled between one end of a transformer first primary winding and...
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6272025 |
Individual for distributed non-saturated magnetic element(s) (referenced herein as NSME) power converters
Single, multistage, and distributed magnetic switched and tank resonant power conversion systems utilizing NSME. The NSME provide, superior protection to conducted lightning transients, superior...
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6266254 |
Switching power circuit
In prior art, the operation of the switching transistors Q1 and Q2 is within a range of class-AB to class-B and they are not good at efficiency since it is difficult to change the operating point...
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6262898 |
Circuit for driving a switching transistor
Circuits for driving a switching transistor (T3) with a driver stage (T2, T4, T5, L1), as are used for example in horizontal deflection stages of television sets or computer monitors, are known in...
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6222751 |
Driver circuit for a polyphase DC motor with minimized voltage spikes
A driver circuit includes a half-bridge output stage including two transistors with a common terminal for connection as the driver output to a coil of a DC motor. Two amplifiers drive the...
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6215680 |
Circuit for obtaining a wide dimming ratio from a royer inverter
The present invention relates to a circuit for obtaining a wide dimming ratio from a Royer inverter and, more particularly, to a circuit that allows a back light to have wide dimming ratio without...
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6181580 |
Single-supply gridding and biasing circuitry
A single power supply circuit, including a push-pull input converter stage and a voltage-controlled latch circuit output stage isolated from each other by a transformer, provides both voltage...
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6169668 |
Zero voltage switching isolated boost converters
Zero voltage switching isolated boost converters that provide high efficiency power conversion between input and output DC voltages. The boost converters includes a voltage amplifying stage...
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6151226 |
Four quadrant power conversion topology
A four quadrant power conversion topology comprising a multi-winding inductor, four switches, and four diodes is disclosed. The four quadrant power conversion is utilized in a number of power...
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6147887 |
Inverter utilizing a bootstrap method
An inverter has a direct voltage intermediate circuit having a positive (Udc+) and a negative (Udc-) voltage busbar, and an auxiliary voltage source (1) which generates auxiliary voltages (U1, U2,...
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6055162 |
Self-oscillating DC-DC converter apparatus and method especially adaptable for VHF operation
A DC-DC voltage converter 40, which is adaptable to VHF operation, has a power oscillator 52 to which a filtered input DC voltage 50 is applied for conversion to an output DC voltage. The power...
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6038156 |
Power inverter with improved heat sink configuration
An inverter for producing AC power from a DC source is disclosed. The inverter uses a transformer and switches to convert current from a battery or other DC source into AC power that can be used to...
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6021052 |
DC/AC power converter
A DC link power converter apparatus including a first DC to DC converter, a DC to AC converter and a load balancing storage element. The first DC to DC converter has first and second DC ports and...
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6005779 |
Rectification and inversion circuits
A circuit used to convert a DC input to an AC output includes a pair of series circuits. Each of the series circuits is in parallel with the DC input and includes a switch and a transformer...
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5995381 |
Pulse width modulation controlled switching regulator
A switching regulator with its less ripples, less switching loss, and low noise, which is capable of being miniaturized with high efficiency is provided. PWM control signals outputted from a...
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5982644 |
Voltage boost circuit for a high voltage converter
A current controlled voltage boost circuit for a high voltage converter. The voltage boost circuit includes a boost converter connected to receive an input voltage and a control signal, and output...
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5963443 |
Power circuit for driving a capacitive load
A power terminal is connected to a DC power source. A differential amplifier has primary and secondary input terminals and an output terminal, and a device applies a reference voltage to the...
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5933335 |
Compact solid state klystron power supply
A line type modulator for modulating an RF power device in a medical linear accelerator is described. The modulator employs a low voltage DC power source and a flyback transformer. Current sensing...
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5903448 |
Four quadrant flyback converter, method of operation thereof and power plant employing the same
A four quadrant flyback converter, employable as part of a ringing signal generator, includes: (1) a transformer having first and second primary windings of opposite polarity and a secondary...
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5872706 |
Circuit arrangement for multiple use of a transformer core
A circuit arrangement for multiple use of a transformer core, comprising a winding with center tap on the primary side and two separate windings on the secondary side, has a controlled switch in...
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RE36040 |
Magnetic DC-to-DC converter
Magnetic direct current to direct current converter with the input isolated from the output. A pulse generator from the feedback is incorporated in the feedback circuitry to regulate the output...
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5777859 |
Voltage converter
In a voltage converter for converting an AC input voltage into a DC high voltage and further DC power supply voltages, in which the AC voltage applied to the converter is applied to a rectifier...
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