Title:
PWM CONTROLLER AND CONTROL METHOD FOR INVERTER
Document Type and Number:
Japanese Patent JP2539146
Kind Code:
B2
Abstract:
PURPOSE: To provide an inverter outputting AC three-phase voltage through PWM control wherein uncontrollable region is eliminated by ensuring minimum ON pulse width and outputting a smooth sine wave voltage over the entire line voltage region.
CONSTITUTION: The three-phase inverter outputting a voltage corresponding to a voltage reference for each phase through PWM control is provided with means 2 for determining any one of normal mode, rectangular mode, or zero correction mode based on the magnitude and the polarity of each of three-phase voltage references. The controller is further provided with means 3 for outputting the voltage reference as it is upon determination of normal mode whereas fixing the voltage reference for one phase at a predetermined level and correcting the voltage references for other phases such that the original line voltage is sustained according to a scheduled algorism upon determination of rectangular mode or zero correction mode. According to the constitution, minimum ON pulse width is ensured and a smooth sine wave voltage can be outputted over the entire three-phase output voltage region.
Inventors:
MYAZAKI SEI
KUROSAWA RYOICHI
BEN BURAHIMU RAZUHAA
KUROSAWA RYOICHI
BEN BURAHIMU RAZUHAA
Application Number:
JP24442892A
Publication Date:
October 02, 1996
Filing Date:
September 14, 1992
Export Citation:
Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
H02M7/48; H02M7/483; H02M7/515; H02M7/5387; H02P27/06; (IPC1-7): H02M7/48; H02M7/515; H02M7/5387
Attorney, Agent or Firm:
Takehiko Suzue