초록 ▼

A motor drive apparatus and an air-conditioner using the motor control apparatus has a feature which allows it to gradually increase a dc voltage value to a predetermined value when starting the switching operation of a chopper circuit by dc voltage control thereof, and when stopping the switching o

A motor drive apparatus and an air-conditioner using the motor control apparatus has a feature which allows it to gradually increase a dc voltage value to a predetermined value when starting the switching operation of a chopper circuit by dc voltage control thereof, and when stopping the switching operation of the chopper circuit to be able to gradually decrease the dc voltage value to a predetermined value. Further, the dc voltage command value is adjusted so as to make it possible to maintain a preferred value of dc voltage. Thereby, fluctuation in the number of revolutions of the motor can be prevented even if the converter is started or stopped while the motor is operating, thereby allowing the motor drive apparatus and air-conditioner using the motor control apparatus of the invention to be operated at their maximum capacities.

대표청구항 ▼

[ What is claimed is:] [1.] A converter control apparatus comprising:converter circuits having a rectifying circuit for rectifying ac power to a dc voltage, a smoothing circuit and a chopper circuit for incrementing and decrementing the dc voltage by means of switching operation of switching element

[ What is claimed is:] [1.] A converter control apparatus comprising:converter circuits having a rectifying circuit for rectifying ac power to a dc voltage, a smoothing circuit and a chopper circuit for incrementing and decrementing the dc voltage by means of switching operation of switching elements and an energy storage effect by inductance; a dc voltage detection circuit for detecting a dc voltage value of a load coupled to said converter circuit; and a dc voltage control means for controlling the switching operation of said chopper circuit such that said dc voltage value coincides with a dc command value on the basis of an output value from said dc voltage detection circuit and said dc voltage command value; wherein when the switching operation of said chopper circuit is started by said dc voltage control means, the dc voltage value is caused to increase gradually to coincide with a predetermined value, and when the switching operation of said chopper circuit is stopped, the dc voltage value is caused to decrease gradually to coincide with a predetermined value.