Single-phase to three phase converter AC motor drive
AssigneeIdeal Power Inc.
InventorWilliam C. Alexander
Life of this patent
Estimating the term…
Abstract
Methods and systems for power conversion. An energy storage capacitor is contained within an H-bridge subcircuit which allows the capacitor to be connected to the link inductor of a Universal Power Converter with reversible polarity. This provides a “pseudo-phase” drive capability which expands the capabilities of the converter to compensate for zero-crossings in a single-phase power supply. Conversion between, e.g., single phase and three phase power is enabled, in either direction, without sacrificing workload performance.
Claims23
A power converter for powering an application requiring both single phase and three phase power, comprising:
- first and second single phase power portals and a three phase power portal;
- a first power module, comprising:
- a first energy-transfer reactance;
- and
- first and second bridge switch arrays interposed between said reactance, and said single phase power portals, respectively, and each comprising one bidirectional switching device for each port of said single phase power portals;
- and
- a second power module, comprising:
- a second energy-transfer reactance;
- third and fourth bridge switch arrays interposed between said reactance, and said second single phase and three phase power portals, respectively, and each comprising one bidirectional switching device for each port of said second single phase and three phase power portals;
- and
- an energy storage capacitor, reversibly connected across said second reactance through a full-bridge configuration.
A power converter, comprising:
- first and second single phase or three phase power portals, said power portals having different numbers of phases;
- an energy-transfer reactance;
- first and second bridge switch arrays interposed between said reactance, and said power portals, respectively, and each comprising one bidirectional switching device for each port of said power portals;
- and
- an energy storage capacitor, reversibly connected across said second reactance through a full-bridge configuration;
- wherein the power converter does not comprise electrolytic capacitative components.
A power converter, comprising:
- a single phase AC power portal and a three phase synchronous motor drive power portal;
- an energy-transfer reactance;
- and
- first and second bridge switch arrays interposed between said reactance, and said power portals, respectively, and each comprising one bidirectional switching device for each port of said power portals;
- and
- a controller which is connected to operate said bridge switch arrays, with mutually exclusive conduction intervals between respective first and second ones of said bridge switch arrays, to drive current through said reactance in both directions during each cycle, and to deliver power pulsating at twice the input power frequency to said motor drive power portal.
Dependencies are inferred from the claim text.