In order to solve the problem of bidirectional driving of the liner motor for valve moving and the dither during the process, researched and developed an amplifier that driving a new type of dynamic electromechanical transducer by using pulse width modulated signal, put forward a driving scheme that overlay dither signal on a pulse width modulated signal. The solution could solve the hysteresis phenomenon of motor during the movements, improved static and dynamic performance of proportional valve, reduced motion loss. Theoretical analysis and simulation results showed that the proportion amplifier device was reliable and could meet the electromechanical converter moving coil drive requirement.