초록 ▼

A three-phase matrix converter for converting AC voltages of predetermined amplitude and frequency into AC voltages of any amplitude and frequency and a method for operating the same, include four-segment switches as main switches which are combined into three switch groups. A resonance capacitance

A three-phase matrix converter for converting AC voltages of predetermined amplitude and frequency into AC voltages of any amplitude and frequency and a method for operating the same, include four-segment switches as main switches which are combined into three switch groups. A resonance capacitance is connected in parallel with each main switch, or an output capacitance of power semiconductors of the main switches acts as a resonance capacitance. An auxiliary commutation device which is provided between three-phase output connections of each switch group has an auxiliary switch constructed as a four-segment switch and a resonance inductance connected in series therewith.

대표청구항 ▼

[ I claim:] [1.] A three-phase matrix converter for single stage conversion of AC voltages of predetermined amplitude and frequency into AC voltages of any amplitude and frequency, comprising:bi-directional switches acting as main switches and combined into three switch groups with three-phase outpu

[ I claim:] [1.] A three-phase matrix converter for single stage conversion of AC voltages of predetermined amplitude and frequency into AC voltages of any amplitude and frequency, comprising:bi-directional switches acting as main switches and combined into three switch groups with three-phase output connections;resonance capacitances each connected in parallel with a respective one of said main switches;auxiliary commutation devices each connected between said three-phase output connections of a respective two of said switch groups, said auxiliary commutation devices each having an auxiliary switch constructed as a bi-directional switch and a resonance inductance connected in series with said auxiliary switch; andsaid main switches having a switching sequence including two capacitive commutations and one inductive commutation in each of said three switch groups during each period of a switching frequency, the inductive commutations being transformed into capacitive commutations by changing a polarity of currents with said main switches using said resonance capacitances and two of said auxiliary switches in series with two of said resonance inductances connected between output phases carrying currents with opposite directions, the transformed inductive commutations of output currents in said switch groups being synchronized selectively after an end of a shortest duty cycle of initially conducting switches, and at an end of a period of the switching frequency.