| 摘要 |
PROBLEM TO BE SOLVED: To enable supply of target voltage to a compressor by storing a voltage loss due to a dead time in a memory and then compensating for the voltage loss, when a power transistor is switched the next time. SOLUTION: A switching time of a power transistor is detected (S11) and thereby it is detected whether or not there is a voltage loss due to a dead time (S12). In the case that there is a voltage loss, a voltage loss value is stores in a memory (S13) and the value is used as a compensation value for the voltage loss, when the power transistor is switched the next time. In the case that there is no voltage loss, it is detected (S14) whether or not there is a voltage loss value stored in the memory. When there is no voltage loss value stored in the memory, the power transistor is switched which responds only for the dead time (S16). When there is a voltage loss value stored in the memory, it is detected whether or not there is the switching time which should be compensated for (S15). In the case that it is necessary to compensate for the switching time, the switching operation for the switching time is made, with respect corresponding to the stored voltage loss value. |
