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7599204 |
Control scheme providing a freewheeling period in a cyclo-converter and a high frequency inverter
A method includes controlling the cyclo-converter 7 in coordination with controlling a coupled HF inverter 3 . The controlling of the cyclo-converter 7 provides at least a first freewheeling...
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7483282 |
PWM method for cycloconverter
A method of using a cycloconverter switches a first switch of the first topology type to an on state after a magnitude of a current through an output inductor becomes less than a predetermined...
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7460377 |
Matrix converter
A matrix converter for converting a polyphase alternating current into a desired alternating output current includes at least two stages; a plurality of controllable bidirectional switches,...
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7388766 |
Harmonic control and regulation system for harmonic neutralized frequency changer
A control and regulation system for use with a harmonic neutralization frequency changer system. In the generalized frequency changer system, a direct converter frequency changer is used to convert...
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7362077 |
Pre-charge method for isolated boost converter
A boost control module operates semiconductor switches of a boost converter circuit in an avalanche mode to precharge a boost output capacitor. The boost control module comprises a switching module...
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7315464 |
Drive system and AC conversion device
A drive system with small power loss in power conversion is provided. The drive system has an AC conversion device for converting commercial AC power from a commercial AC power supply and a DC...
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6900998 |
Variable-speed wind power system with improved energy capture via multilevel conversion
A system and method for efficiently capturing electrical energy from a variable-speed generator are disclosed. The system includes a matrix converter using full-bridge, multilevel switch cells, in...
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6882550 |
Harmonic neutralized frequency changer
A power converter that produces variable frequency multiphase AC power from fixed or variable frequency AC power. The converter can be used to drive an AC motor for propulsion applications or other...
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6826065 |
Method of commutation of current by bi-directional switches of matrix converters
A method of commutation of current by separately controlled in each direction bi-directional switches of a matrix converter (MC) with at least three input phases, which allows to provide a safe...
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6771524 |
Multiple PWM cycloconverter
A multiple PWM cycloconverter or matrix converter uses reactors to connect various phase output terminals in parallel.
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6704215 |
Method for controlling a matrix converter
The invention relates to a method for controlling a matrix converter with nine bi-directional power switches arranged in a 3×3 switch matrix. Four active switching states and one zero voltage...
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6693813 |
Device for quasi-direct pulse-width controlled energy conversion between three-phase system
Three phase input voltage systems and three phase output voltage systems connected between a first rail and a second rail. Each of the three phase input voltage system includes an interruptible...
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6449181 |
Inverter for conversion of electrical energy
Frequency converters for converting electrical energy, in particular for a vehicle electrical system, are proposed which have individual partial frequency converters and include at least one half...
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6448737 |
Semiconductor switch device for an AC power source
A semiconductor switch device for an AC power source comprises several first semiconductor elements and several second semiconductor elements connected in series with a plurality input AC sources...
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6351397 |
Protection apparatus and protection method of PWM cycloconverter
A protection apparatus and a protection method of a PWM cycloconverter wherein when the PWM cycloconverter is shut off, a surge voltage or an overcurrent is not produced on the output side are...
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5949672 |
Three-phase matrix converter and method for operation thereof
A three-phase matrix converter for converting AC voltages of predetermined amplitude and frequency into AC voltages of any amplitude and frequency and a method for operating the same, include...
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5724238 |
Circuit arrangement for producing an A.C. voltage for driving a pane or panel having a variable light transparency
A power supply circuit generates an alternating driving voltage for switching a pane or panel between a transparent state and a substantially opaque state. The pane or panel is, for example, a...
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5663878 |
Apparatus and method for generating a low frequency AC signal
An apparatus and method for generating a low frequency AC signal such as a ringing voltage signal for a telephone subscriber interface unit or the like. The apparatus comprises an oscillator which...
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5594636 |
Matrix converter circuit and commutating method
A method and apparatus for AC-to-AC power conversion wherein commutation from one switch in a switching group to a second switch is effected while both switches are enabled simultaneously without...
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5517082 |
Traveling wave tube heating coil power supply with varying frequency AC current limiting means
A power supply for supplying the heating coils of a tube (WR), in particular a traveling-wave tube, wherein a transformer (Tr) and an inverter (S1, S2) are provided in the heating circuit of the...
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5285371 |
Power conversion apparatus
A power conversion apparatus includes: a reference signal generating circuit for generating a reference signal which has a first frequency; a first power converter for converting D.C. power into...
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5285365 |
Power conversion system, method for controlling the same, and uninterruptible power supply using the same
A three-phase a.c. uninterruptible power supply includes a transformer providing isolation between an input and an output, a single-phase inverter, and a cycloconverter. The uninterruptible power...
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5274538 |
Power conversion apparatus
A power conversion apparatus comprises an inverter circuit for converting DC power into AC power which has a first frequency; a transformer connected to the inverter circuit. A cyclo converter...
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5241298 |
Electrically-and-magnetically-coupled, batteryless, portable, frequency divider
A batteryless, portable, frequency divider includes a first resonant circuit that is resonant at a first frequency for receiving electromagnetic radiation at the first frequency; and a second...
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5189603 |
DC to AC electric power converting apparatus
A DC-to-AC electric power converting apparatus including an invertor circuit having a plurality of switching elements, a transformer connected to the invertor circuit, and a cyclo-converter circuit...
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5159539 |
High frequency DC/AC power converting apparatus
A DC-to-AC electric power converting apparatus includes: an inverter circuit for converting DC electric power into AC electric power; a transformer connected to the inverter circuit; a...
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5047909 |
Power conversion apparatus with harmonic filtration
A power conversion apparatus capable of eliminating inexpedient higher harmonic components from its output, without lowering the conversion efficiency. The apparatus includes a first power...
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5005115 |
Forced-commutated current-source converter and AC motor drive using the same
An AC-to-AC converter operating as a current-source between an AC input line and an AC output line connected to a load, for instance an AC motor, includes three groups of bilateral switches...
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4996505 |
Frequency triplicator for microwaves
Frequency triplicator for microwaves having frequencies above about 30 GHz, for example 70 GHz, comprising a non-linear element of a weakly doped semiconductor material, in particular n-Si with a...
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4894766 |
Power supply frequency converter
The present invention achieves the above objects, among others, by providing apparatus for converting a supplied AC input signal into an AC output signal having a selected lower frequency than the...
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4833588 |
Direct AC/AC converter system
In a direct AC to AC converter system the normal rectifier assistance functions are phase modulated by a 30° lag and by a 30° lead, and switching between lagging and leading function is effected...
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4819148 |
Digital gate pulse generator for cycloconverter control
The present invention provides a digital gate pulse generator which controls the output of a cycloconverter used for electrical power conversion applications by determining the timing and delivery...
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4754244 |
Distributed balance frequency multiplier
A distributed balance frequency multiplier has a transmission line that is configured using lumped elements having connection points for inputting signals. Connected to each connection point is the...
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4688154 |
Track lighting system with plug-in adapters
Subject track lighting system comprises a more-or-less regular lighting track having at least two pairs of track conductors. Of these track conductors, an initial pair carries the regular 120...
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4685049 |
Unrestricted frequency changer switch topology
The N converters of a UFC bridge system interconnecting an N-phase voltage source to N output loads, comprise each N bilateral switches connected to one end of the associated output load and (N-1)...
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4670740 |
Portable, batteryless, frequency divider consisting of inductor and diode
A batteryless, portable, frequency divider consists of a single resonant circuit consisting of an inductor and a diode. The resonant circuit detects electromagnetic radiation at a first...
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4660006 |
Radio frequency multiplier producing an even harmonic output
A radio frequency multiplier circuit includes a first plurality of non-linear devices, each device having an input electrode and an output electrode. The input electrode of each one of the first...
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4648022 |
Matrix converter control system
A three-pulse UFC system uses three groups of three bilateral switches controlled according to a switch polarity pattern to generate AC currents to a load, and a deadband hysteresis having upper...
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4642751 |
Hidden DC-link AC/AC converter using bilateral power switches
The invention resides in providing bilateral switches between the respective phase lines of an AC input source and a common phase line of an AC output to form a phase line group of said bilateral...
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4642590 |
Frequency multiplier having open and short circuited lines resonating a multiplied output frequency
Multipliers for high frequencies having an input and an output. The input is connected via a terminating impedance to the input of a short-circuited transmission line having a length λ/4, where λ...
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4631500 |
Microwave frequency divider having regenerative oscillation
A microwave frequency divider circuit. The frequency divider comprises a nonlinear amplifier including input and output ports for amplifying signals applied to the input port. The amplifier...
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4628425 |
Method and apparatus for the conversion of a polyphase voltage system
A three phase voltage system, balanced and sinusoidal, is converted into another one, having the same properties, but with amplitude, frequency and phase changed, by means of sequential sampling of...
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4523163 |
Wideband microwave device generating even harmonics of an incident signal
A wideband microwave device for generating even harmonics of an incident microwave signal. A co-planar-type input structure conducts an incident microwave signal with an asymmetrical propagation...
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4488215 |
Method and apparatus for controlling the load current of a pulsed frequency converter
A system for forming address signals which address respective converter switches in a frequency converter. The frequency converter is of the type wherein a DC voltage is provided for supplying...
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4479175 |
Phase modulated switchmode power amplifier and waveform generator
A phase modulated DC-to-AC or a DC-to-DC power converter utilizes input terminals connected to a source of power and output terminals connected to a suitable load. The transfer of power between the...
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4300077 |
Trans-synchronous motor apparatus and method
This disclosure is concerned with a motor technique for generating speeds that are fractions of synchronous speeds, through novel time-staggered selected half-cycle energization of a plurality of...
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4255782 |
Electrical energy conversion systems
Electrical circuits, apparatus and methods for a variety of applications. A switching device subdivides an alternating current input signal into a plurality of lower voltage pulses by switching on...
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4190808 |
Amplifier-oscillator frequency multiplier apparatus
An amplifier-oscillator frequency multiplier apparatus utilizing a pair of servo-connected amplifiers which are electronically switchable to provide either a coherent amplifier or a non-coherent...
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4188584 |
Mixer
A mixer is provided with a first waveguide part for the transmission of an input signal to be converted to a lower frequency band and with a second waveguide part for the transmission of a signal...
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4105897 |
Cycloconverter apparatus and method for working into an active load
A cycloconverter apparatus and method is disclosed in which the cycloconverter works into an active load. The cycloconverter is connected between an external power source and a load so that the...
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