| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC-DC converter capable of performing a transformation operation on the basis of a current detected by one current sensor.SOLUTION: In a DC-DC converter comprising an N (≥2)-phase bridge circuit, a single current sensor is arranged between an output terminal of the N-phase bridge circuit and a smoothing capacitor. The center phases of respective sections obtained by dividing the control cycle into N sections by using a carrier having a frequency N times as large as a PWM control frequency are used as starting points for generating pulses of respective phase PWM signals, and a width of the pulses is increased from each starting point in both phase directions to generate an N-phase PWM signal. Current separation and extraction means separates and extracts currents individually flowing in respective N phase reactors from values obtained by sampling a current detected by the current sensor a plurality of times at timings synchronized with the carrier within one control cycle of the PWM signal. A PWM command value is generated on the basis of a current command value and the respective phase reactor currents extracted by the current separation and extraction means. |
