Polyphase AC/DC converter
AssigneeSundstrand Corporation
InventorEdwin J. Shires
Life of this patent
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Abstract
A power converter for converting input AC power comprising N phase-to-phase input AC waveforms at a first frequency into overall output DC power, where N is an integer greater than two, includes N phase-to-phase AC/DC converters each receiving a phase-to-phase waveform and having outputs connected in series whereby the converter outputs are combined to develop the overall output DC power. The AC/DC converters are operated such that a parameter of the input AC power and a parameter of the overall output DC power are controlled.
Claims13
A power converter for converting input AC power comprising N phase-to-phase input AC waveforms at a first frequency into overall output DC power, where N is an integer greater than two, comprising:
- N phase-to-phase AC/DC converters each receiving a phase-to-phase waveform and having outputs connected in series including
- first means for rectifying the phase-to-phase waveform to obtain intermediate DC power,
- means coupled to the first rectifying means for converting the intermediate DC power into intermediate AC power at a second frequency greater than the first frequency and
- second means for rectifying the intermediate AC power to obtain converter output DC power;
- wherein the converter output DC powers are combined to develop the overall output DC power;
- and
- means for operating the N phase-to-phase AC/DC converters whereby a parameter of the input AC power and a parameter of the overall output DC power are controlled.
A power converter for converting input AC power produced by an AC power source and comprising N phase-to-phase voltages at a first frequency into an overall DC output voltage, where N is an integer greater than two, comprising:
- N phase-to-phase AC/DC converters each receiving a phase-to-phase voltage and having outputs connected in series including
- a first full-wave rectifier for rectifying the phase-to-phase waveform to obtain intermediate DC power,
- an H-bridge inverter coupled to the first full-wave rectifier having controllable power switches for converting the intermediate DC power into intermediate AC power at a second frequency at least an order of magnitude greater than the first frequency and
- a second full-wave rectifier for rectifying the intermediate AC power to obtain a converter DC output voltage;
- wherein the converter DC output voltages are combined to develop the overall DC output voltage;
- and
- means for operating the controllable power switches in each H-bridge inverter whereby the power converter presents substantially a unity power factor load to the AC power source and whereby the DC output voltage is regulated.
Dependencies are inferred from the claim text.