| 摘要 |
A circuit accurately detects an arm voltage pulse from an inverter that is used for on-delay compensation. Specifically, switching elements S1 to S6 are provided with detection circuits C1 to C6, respectively, for detecting an on or off state of a corresponding inverter arm in order to detect an arm voltage pulse from the inverter accurately and without delay. Since outputs from the detection circuits C1, C3, C5 on an upper arm have an excessively high voltage level before processing, level-down circuits Dw1, Dw3, Dw5 reduce these outputs down to an appropriate voltage level for signals used by a control circuit. The outputs are then provided to an on-delay compensator in the control circuit.
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