Development Trend of Power Distribution Technology for Passenger Cars Traditional fuses and relays belong to electromechanical components, which belong to the field of material and mechanical-electrical combination, while MOSFET and HSD chips based on semiconductor technology are electronic devices. There are essential differences between the two. Based on There are two power distribution schemes for semiconductor devices according to application scenarios. Driver chip + MOSFET discrete scheme. The complexity of this scheme is very high, which is highlighted in the following aspects: current detection is difficult, circuit protection is complex, diagnostic functions are complex, protection functions are few, protection speed is slow, and protection strategies are complex. The comprehensive cost of this scheme is relatively high, and it is suitable for high current occasions. At present, there are few in-vehicle applications – the application of high-current in vehicles is still dominated by fuses + relays.