Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1986-09-25
1988-03-08
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363127, 363132, H02M 5458, H02M 7162, H02M 75387
Patent
active
047302429
ABSTRACT:
A high efficiency power converter is achieved utilizing a resonant DC link between a DC source, such as a converter rectifying power from an AC power system, to a variable frequency voltage source inverter. A resonant circuit composed of an inductor and capacitor is connected to the DC power supply and to a DC bus supplying the inverter and is caused to oscillate stably at a high frequency to provide a uni-directional voltage across the DC bus which reaches zero volts during each cycle of oscillation of the resonant circuit. The switching devices of the inverter are controlled to switch on and off only at times when the DC bus voltage is zero, thereby eliminating switching losses in the inverter. The resonant circuit can be caused to oscillate utilizing pairs of switching devices in the inverter or a separate switching device across the capacitor, which again are caused to switch on and off only at times of zero voltage on the DC bus. For AC to AC conversion, enabling bi-directional power flow, the switching devices of the power source which converts AC power to DC power may have switching devices which are also switched only at the times of zero voltage so that switching losses in these devices is also minimized.
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Beha Jr. William H.
Wisconsin Alumni Research Foundation
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