Digital resonance driver for electrical resonator has digital control unit that increases/reduces phase relative to each other around adjustable phase angle based on determined difference between output signals of current sensors

摘要

The driver has H-bridge (2) with two branches (A,B), in whose middle the resonator is to be attached. The current sensors (13,14) provide output signals representing time mean value of current by output of branches to earth. A digital control unit (15) determines difference between the output signals of sensors and forms two square wave signals for control that to form both branches of the H-bridge, which comprise equaled frequency and palpation degree of 50%. The control unit increases phase around adjustable phase angle and reduces/increases based on determined difference.