... to use full-bridge IGBT high-power integration modules-Germany Siemens to control power source,good protection against high temperature, ... ,Withstand high temperature.it can reach up to 80C, Siemens modules is of high pressure resistance,as transistor and filed ... function but also disturbing the transducer's frequency,Siemens can avoid this.3, Siemens module control power is higher than other components ...