Control circuit of power converting apparatus

Details Control circuit of power converting apparatus Control circuit of power converting apparatus

H - Electricity

02

M

H02M 1/16 (2006.01) H02M 1/00 (2006.01) H02M 7/5387 (2006.01)

Patent

CA 2360613

In a control circuit of a power converting apparatus such as a three-phase inverter, unnecessary switching operations of a plurality of switching elements employed in this three-phase inverter can be avoided. The control circuit used in the power converting apparatus is arranged by comprising: current sensors for detecting inverter currents; three-phase current command generating circuit for generating a current command value; adders/substracters for calculating a current deviation between the current command value and the inverter current; voltage detecting circuit for detecting voltages of the three-phase power supplies; and PWM pattern selector circuit operated in such a manner that a current deviation vector is obtained from the current deviation, an allowable range region is set with respect to the current deviation vector, in the case that the resulting current deviation vector is not located within the allowable range region, a moving direction of the current deviation vector as to a plurality of output voltage vectors of the power converting apparatus is obtained based upon the resulting power supply voltage vector, and then, the switching command generating means outputs such an output voltage vector in which the moving direction of the current deviation vector among the resulting plural moving directions is directed to the allowable range region.

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