Solid-State Phase SplittingTransformer

摘要

A solid state power transformer is described for converting an input power signal at a first phase or voltage to an output signal of a second voltage or opposite phase by the use of bidirectional solid state switches switched at a high carrier frequency to produce a double-sideband, suppressed-carrier representation of the input power signal, which is then synchronously demodulated using further similar switches to produce the desired output. It is further disclosed that multiple instances of the above with relative phase-staggering of the switching frequency may be operated in parallel and activated or deactivated according to output current demand to provide maximum efficiency over a wide range of current and power levels.

主权项

1. A device for producing an electrical power output voltage at an output terminal of desired phase relative to an electrical power input voltage applied at an input terminal, the device having high power efficiency, including:—
At least one module comprising:— A transformer designed to operate at a carrier frequency much higher than the frequency of said electrical input and output voltages, said transformer having a first winding end, a second winding end and a center tap; first and second bidirectional solid-state switches for alternately passing current from or blocking current flow from said input terminal to alternate winding ends of said transformer, the switches being configured to be controlled to allow current to flow from said input terminal to said first winding end or said second winding end alternately at said carrier frequency, and third and fourth bidirectional solid state switches for alternately passing current from or blocking current flow from said first transformer winding end and said second winding end to said output terminal, the switches being configured to be controlled to allow current flow to said output terminal from said first winding end or said second winding end alternately at said carrier frequency, said bidirectional solid state switches being controlled by a switching controller configured to control said first, second, third and fourth bidirectional solid-state switches such that said electrical power output voltage of said desired phase appears at said output terminal.