초록 ▼

A method and apparatus for AC-to-AC power conversion wherein commutation from one switch in a switching group to a second switch is effected while both switches are enabled simultaneously without causing a short circuit between the phase input lines associated with each respective switch. Each switc

A method and apparatus for AC-to-AC power conversion wherein commutation from one switch in a switching group to a second switch is effected while both switches are enabled simultaneously without causing a short circuit between the phase input lines associated with each respective switch. Each switch in a switching group is bidirectional and polarity-controlled, and may be selectively enabled to conduct only negative-polarity or positive-polarity current, or may be disabled. An overvoltage clamping circuit is also provided with each switch. A switch gating control circuit is employed to provide selective operation of the switches in a particular switch group.

대표청구항 ▼

An AC-to-AC converter for connection between an input power source and an output load, said converter comprising: a plurality of switch groups; each of said plurality of switch groups having a plurality of switch means for selective unidirectional control of current flow in either of two directions;

An AC-to-AC converter for connection between an input power source and an output load, said converter comprising: a plurality of switch groups; each of said plurality of switch groups having a plurality of switch means for selective unidirectional control of current flow in either of two directions; each of said plurality of switch groups being associated with a corresponding common output phase line; each of said plurality of switch means being associated with a respective input line phase; each of said plurality of switch groups having a gating control means for delaying the turn-OFF of each of said plurality of switch means within respective ones of said plurality of switch groups by an overlap period without delaying the turn-ON of each of said plurality of switch means within respective ones of said plurality of switch groups so that two of said plurality of switch means within said switch group selected for conduction in sequence are simultaneously enabled for conduction during at least a portion of said overlap time period; and said gating control means being connectable with respective ones of said plurality of switch means within one switching group and interposed between said respective ones of said plurality of switch means and a matrix converter controller.