| 摘要 |
The invention relates to a control system for direct current actuators in power electronics, based on pulse width modulation, comprising a H-bridge of four switches, each switch incorporating a bipolar transistor (T1,T2,T3,T4) and a diode (D1,D2,D3,D4) connected in reverse parallel between the emitter and collector thereof, and a control circuit (11) for said transistors. The control circuit (11) supplies four signals (V1,V2,V3,V4) permitting the time shifting of the switching of these four transistors (T1,T2,T3,T4) in such a way that during a switching of one of them no pair of transistors is simultaneously switched on, both with respect to transistors belonging to two lateral branches of the bridge and transistors belonging to two opposite branches of said bridge.
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