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US 9,425,706 B2Granted
Control of a DC-AC inverter with unbalanced loading
AssigneeGE Aviation Systems LLC
InventorsPhilip Henry Richard Epps, Andrew Benjamin Cole
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AssigneeGE Aviation Systems LLC
InventorsPhilip Henry Richard Epps, Andrew Benjamin Cole
Estimating the term…
A three phase inverter consisting of three single phase legs using either switch mode or linear control is fed by a DC-DC converter to provide input output isolation. This requires that the DC-DC converter delivers equal positive and negative voltages to the single phase legs to allow each output to generate a high fidelity sine wave outputs to the load. By measuring the error voltages on the positive output, the negative output and the total output of the DC-DC converter it is possible to control a single duty cycle while maintaining all three output voltages within the limits required by the DC-AC phase legs. This significantly reduces the cost and complexity of the DC-DC converter and eliminates the need to use a fourth phase leg to generate the neutral connection for a three phase output.
A control system for a circuit including a DC supply, a DC-AC inverter of the type having a plurality of solid state switches, a DC-DC converter between the DC supply and the DC-AC inverter, and an AC output from the DC-AC inverter, wherein when a load is applied to the AC output, positive, negative and total voltages are measurable at the input of the DC-AC inverter, characterized by:
A method of controlling voltage inputs to a DC-AC inverter of the type having a plurality of solid state switches, a DC supply, a DC-DC converter between the DC supply and the DC-AC inverter, and an AC output wherein when a load is applied to the AC output, positive, negative and total voltage inputs to the DC-AC inverter are measurable via first, second and third busses, characterized by:
Dependencies are inferred from the claim text.