Resonant Power Converters Using Impedance Control Networks And Related Techniques

摘要

An impedance control resonant power converter (converter) operated at a fixed switching frequency includes an impedance control network (ICN) coupled between two or more inverters operated at a fixed duty ratio with a phase shift between them and one or more rectifiers. The phase shift is used to control output power or compensate for variations in input or output voltage. The converter operates at fixed frequency yet achieves simultaneous zero voltage switching (ZVS) and zero or near zero current switching (ZCS) across a wide operating range. Output power may be controlled by: (1) changing phase shift between inverters; or (2) adjusting phase shift between inverters depending upon input and/or output voltages so that an admittance presented to the inverters is conductive and then turning the converter on and off at a frequency lower than the converter switching frequency to control output power below a value set by the phase shift.

主权项

1. An impedance control resonant (ICR) power converter having a converter input and a converter output, the ICR power converter comprising:
a plurality of inverters each of said plurality of inverters having an input and coupled to the converter input and each of said plurality of inverters having an output; one or more rectifiers each of said one or more rectifiers having an input and each of said one or more rectifiers having an output coupled to the converter output; and an impedance control network (ICN) having a plurality of inputs each coupled to a corresponding output of said plurality of inverters and said impedance control network having one or more outputs each coupled to a corresponding input of the one or more rectifiers wherein said impedance control network causes the inverters to interact such that the switching frequency components of the individual inverter currents remain relatively close in phase to the corresponding individual inverter switching frequency voltages as the relative inverter phase angles change over a specified operating range, whereby the inverter switches commutate at currents that are low compared to the peak switch currents.