Patent ID: 6344988
Filing Date: 2002-02-05
Classification: H02M

Abstract:
A power unit comprising:a three-phase generator having a three-phase output windings; a pair of variable control bridge circuits connected to said three-phase output windings of said three-phase generator and connected in an antiparallel manner to each other to form a cycloconverter for generating a single-phase alternating current to be supplied to a load; voltage-detecting means for detecting a voltage of said single-phase alternating current generated by said pair of variable control bridge circuits; effective voltage value-detecting means for detecting an effective value of said voltage of said single-phase alternating current; reference waveform voltage-generating means for generating a voltage having a reference waveform for controlling said single-phase alternating current; reference effective voltage-generating means for generating a reference effective voltage for controlling said single-phase alternating current; and control means for controlling said pair of variable control bridge circuits such that said pair of variable control bridge circuits alternately switch to operate every half a repetition period of said single-phase alternating current, so as to make said effective value of said voltage of said single-phase alternating current detected by said effective voltage value-detecting means closer to a value of said reference effective voltage generated by said reference effective voltage-generating means, and at the same time, make said voltage of said single-phase alternating current detected by said voltage-detecting means closer to said voltage having said reference waveform, which is generated by said reference waveform voltage-generating means.