| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverter of three-phase brushless DC motor, which can detect currents with high accuracy, without using current sensor. SOLUTION: A current detecting section 7 detects voltage drops in three current detecting resistor elements 6a, 6b, and 6c, respectively installed between lower arm-side switching elements 5d, 5e, and 5f and a low-order DC power supply line 10. Consequently, the required band width for a circuit can be compressed significantly, as compared with the conventional resistor type current detection system. |
