Design And Implementation Of The Marine Navigation Pulse Generator Based On The Technology Of MOSFETs In Series And Parallel Connection

Technology of generating high power electric pulse is widely used many areas such as weapons industry, civil industry, and environmental protection etc. The pulse generating technology is also applied in the pulse generator of ship navigation equipment.As a part of ship navigation equipment, the performance of pulse generator in ship navigation equipment is critical to the reliability, accuracy, and safety of the equipment. However, most of the pulse generators are designed with hydrogen thyratron tube as the main switch at present. The hydrogen thyratron is a half controlled device and the performances of turn-on and turn-off switching are not agile, which limits the performance of the pulse generator. An ideal waveform from the pulse generator is a rectangular pulse with zero rise time and zero fall time, though it’s impossible in reality. Many methods are used to reduce the rise time and fall time of the waveform when designing the pulse generator. Here MOSFET(Metal-Oxide-Semiconductor Field-Effect Transistor) is used as fast switch instead of hydrogen thyratron. MOSFET is a full control power electronic device and it can turn on or turn off very quickly. It is quite idea for the purpose as a switch for pulse generating.When MOSFETs are used as switches in pulse generator of ship navigation equipment, the main circuit and drive circuit are designed, parameters of devices and parts are calculated in this artic le. The auxiliary c ircuit modules are chosen and the problems related with MOSFETs in series and parallel are also analyzed here. Several MOSFETs are used in series and parallel to enhance the overall current and voltage of generated pulse. The current through each MOSFET and voltage across each are also decreased by this method, as well as the capacity and reliability of pulse generator system are also increased. The imbalance of MOSFETs in series and parallel is also analyzed and the solution is deduced in the artic le. Experiments are carried out by the pulse generator we built and the solution is verified and discussed finally.