| 摘要 |
PROBLEM TO BE SOLVED: To more expand the cooling ability of an air conditioner and to carefully control the ability of the conditioner even when the load largely fluctuates by providing an active converter which generates a DC voltage by using inverter power which drives an induction motor and an active element from a three- phase AC power source. SOLUTION: An active converter is constituted by generating a voltage value 17 to a smoothing electrolytic capacitor 8 connected to the output of a transistor module 7. A high-order harmonic current contained in a ripple current generated when the converter is operated is reduced when an AC rector 3 is set to a value of 2-14mH. In addition, when the effective voltage value of a three-phase AC power source 1 is set at 200V, the DC voltage generated by the active converter is boosted to about 340V. Therefore, a higher voltage can be supplied to an induction motor 12 in a compressor and the varying range of the number of revolutions of the motor 12 can be widened and, in addition, the controlling range of the ability of an air conditioner can also be widened. |
