Low-volume power supply for vehicular fuel injection systems

This paper introduces a new power supply for solenoid fuel injectors of internal combustion engines. In comparison with the conventional solutions, the presented supply has smaller volume, higher reliability, and can be implemented with less expensive power stage components. The supply is a hybrid topology, combining boost and non-inverting buck-boost phases regulated by a digital load-interactive controller. Experimental results obtained with a 12V-to-50V, 40W, 100KHz converter confirm operation without bulky and unreliable electrolytic capacitors, 11 times smaller output capacitance and two times faster dynamic response compared to the conventional single-phase boost solution.