A Robust High-Pressure Fuel Pump Circuit Topology Routing Clamping Energy to a Power Supply Input

摘要

The present invention provides a circuit topology to reduce energy dissipation in a High-Pressure Fuel Pump (HPFP) Driver interface. The system utilizes MOSFET and diode components to steer current through the pump load. HPFP Load is energized by switching ON the reverse current blocking MOSFET 8, high-side MOSFET 9. and low-side MOSFET 10. Recirculation diode 6 provides a freewheeling current path when high-side MOSFET 9 is switched OFF and low-side MOSFET 10 is switched ON. A Control ASIC or equivalent device monitors the voltage drop across high-side MOSFET and low-side MOSFET relative to the commanded state of each MOSFET to delect faults (e.g. short to power, short to ground etc.).