| 摘要 |
PROBLEM TO BE SOLVED: To set constitution of a part controlling amplitude of a signal wave, based on a deviation between a command value and an output value in a power conversion device to be simple and inexpensive. SOLUTION: A deviation between an output voltage amplitude command value VL* and an output voltage amplitude VL is amplified by a PI computing element 111, and a signal X is generated. It is reduced from a constant 1 and a signal (1-X) is obtained. A triangular wave of constant amplitude from an UP/DOWN counter 119 is processed by multiplication 120 by the signal (1-X) and a carrier Vt is obtained. A three phase sine wave signal Vr with constant amplitude is compared with a carrier Vt in comparators 107, 108 and 109. Switching signals Cu, Cv and Cw of a transistor are outputted. |
