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US 4,115,729 AGranted
Multiphase to single phase and frequency converter system
AssigneeTenna Power Corporation
InventorsThomas A. Young, Ronald J. Freimark
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AssigneeTenna Power Corporation
InventorsThomas A. Young, Ronald J. Freimark
Estimating the term…
A multiphase to single phase electrical energy converter wherein the frequency is converted from a relatively high frequency, in the order of 1,000 hertz, to a relatively low frequency, as for example, normal household frequency of 60 hertz. A three-phase alternator is driven by an internal combustion engine and in one form of the invention the output of the alternator is fed to a controllable, full-wave bridge circuit and finally to an inverter. The controllable bridge circuit is controlled by a resolver, the resolver, alternator rotor and internal combustion engine all operating at the same rotary speed. In the one form the resolver is utilized to control the conduction of a plurality of controlled semiconductor devices interconnected between the output windings of the alternator and the invertor to control the delivery of energy from the alternator to the inverter. In another form the controlled semiconductor devices are replaced by a modified resolver. In accomplishing the control, the controlled rectifiers or modified resolver are rendered conductive to provide an average current or power to the inverter which increases and decreases in a unipolar sinusoidal form at a frequency which is twice the desired output frequency. The bridge circuit then provides an output to an inverter device which is rotating at one-half the speed of the resolver, the inverter being utilized to invert every other cycle of the output from the resolver. Thus, the power from the inverter will take the form of an alternating sinusoid waveform insofar as the power output is concerned at 60 hertz.
An energy conversion system for converting multiphase, high frequency energy to single phase, low frequency energy, the improvement comprising an alternating current generator for generating the multiphase energy, full wave rectifying means connected to the output of said generator for rectifying the output from said generator to produce a unidirectional output from said rectifying means including controlled rectifying means for controlling the passage of energy from said generator through said full wave rectifying means, output switching means connected to the output of said full wave rectifying means for inverting selected portions of the unidirectional output and producing an alternating output from said output switching means, control switching means connected to said controlled rectifying means for controlling the conduction of said controlled rectifying means and controlling the flow of energy through said controlled rectifying means in accordance with a constant voltage amplitude wave form that is time modulated in coordination with the rotation of said alternating current generator, and connection means interconnecting said control switching means and said output switching means for synchronizing the conduction of said full wave rectifying means and the inversion of said selected portions of the unidirectional output.
An energy conversion system for converting multiphase, high frequency energy to single phase, low frequency energy, the improvement comprising an alternating current generator for generating the multiphase energy, full wave rectifying means connected to the output of said generator to produce a unidirectional output from said rectifying means including controlled rectifying means comprising at least one controlled rectifier for each phase of the multiphase generator which is rendered conductive for a preselected period of time, output switching means connected to the output of said rectifying means for inverting selected portions of the unidirectional output and producing an alternating sinusoidal output from said output switching means, control switching means connected to said controlled rectifying means for controlling the conduction of said rectifying means and controlling the flow of energy through the controlled rectifying means in accordance with a constant voltage amplitude waveform which is time modulated in coordination with the rotation of said alternating current generator, and connection means interconnecting said control switching means and said output switching means for synchronizing the conduction of said rectifying means and the inversion of said selected portions of the unidirectional output;
A method of converting multiphase high frequency energy to single phase, low frequency energy from a generator comprising the steps of generating the multiphase energy, rectifying the multiphase energy to produce a unidirectional output including controlling the passage of energy during said rectifying, inverting selected portions of the unidirectional output and producing an alternating output from said unidirectional output, controlling the rectification and the flow of energy during said controlling step in accordance with a time modulated, constant voltage amplitude wave form and synchronizing the rectification of the multiphase energy and the inversion of the unidirectional output with the high frequency of said multiphase energy.
In an engine driven electrical energy generator system having a generator with a field winding and an armature, and an engine connected in driving relation with the generator, the engine including an ignition primary circuit generating a series of electrical pulses in response to the rotation of the engine, the improvement comprising an energy storage means connected to the ignition primary for storing at least a portion of the series of electrical pulses, means connecting the energy storage means to the field for initially providing excitation energy to the field winding from the ignition primary and the energy storage means during the start-up of the generator, running field excitation means connected to the armature winding and field winding for providing exciting energy to the field from the armature winding during running of the generator, and switching means for controlling the connection of said energy storage means or the armature winding to the field winding in response to said exciting energy from the armature winding bearing a preselected relationship to the voltage at said energy storage means.
An energy conversion system for converting multiphase, high frequency energy to single phase, low frequency energy, the improvement comprising an alternating current generator for generating the multiphase energy, rectifying means connected to the output of said generator for rectifying the output from said generator to produce a unidirectional output from said rectifying means including control switch means for controlling the passage of energy from said generator through said rectifying means in a timed sequence for providing a plurality of pulses varying in width to define a plurality of unidirectional waves varying at twice the output frequency comprised of a preselected number of pulses, output switching means for receiving said unidirectional waves and inverting alternate ones thereof to produce an alternating output, and connection means interconnecting said control switch means and said output switching means for synchronizing the conduction of said rectifying means and the inversion of said unidirectional wave.
Dependencies are inferred from the claim text.