智能MOSFET在汽车电子系统中的应用

Application of Smart MOSFET in Automotive Electronic Systems

针对智能MOSFET(Metal-Oxide-Semiconductor Field-Effect Transistor)在汽车电子系统应用中遇到的问题,提出了相应的技术解决方案:针对智能MOSFET在电源反接、短路、过载以及抛负载工况下的损坏问题,提出了硬件保护电路及软件控制策略;针对智能MOSFET的电流反馈精度差,无法满足控制精度,提出通过标定提高检测精度的方法。通过并联智能MOSFET降低导通电阻,提高了回路的通流能力。通过在负载两端并联TVS(Transient Voltage Suppressor),解决了智能MOSFET钳位能量能力不足问题。通过试验及实车测试,验证了方案的可行性和有效性。

In view of problems encountered in the application of intelligent MOSFET（ Metal-OxideSemiconductor Field-Effect Transistor） in automotive electronic system,the corresponding technical solutions are put forward. Aiming at the damage problems of Smart MOSFET under the condition of power reverse,short circuit,over load and load dump,the hardware protection circuit and software control strategy are put forward.Aiming at the low current feedback accuracy of Smart MOSFET,which can not meet the control accuracy,the method of improving the sensing accuracy through calibration is put forward. The on-resistance is reduced by parallel Smart MOSFET to improve the current capacity. To increase the capacity of the clamping energy,a TVS（ Transient Voltage Suppressor） is connected with smart MOSFET in parallel. The feasibility and validity of the schemes are verified by experiments and real automotive tests.