A New Design of Solid-State Bipolar Nanosecond Pulse High-Frequency Discharge Power Supply for Engine Ignition System

Abstract

<div class="section abstract"><div class="htmlview paragraph">In this study, a bipolar nanosecond pulse all-solid-state power supply was developed including Lenz capacitance (LC) resonant circuit and full-bridge inverter circuit to provide plasma ignition mode for internal combustion engines. The power supply converts the direct current (DC) voltage into voltage pulses using the inverter circuit with insulated gate bipolar transistor (IGBT), and subsequently amplifies the voltage through a pulse transformer. In the magnetic compression circuit, two capacitors were utilized to store energy simultaneously and approximately double the voltage. By exploiting the hysteresis characteristics of the magnetic switch, a nanosecond pulse output was achieved. An enhanced full-bridge inverter snubber circuit was proposed, which can effectively absorb surge voltage, with a voltage impact reduction on the primary winding of the pulse transformer to less than 1%. The newly developed bipolar nanosecond pulse power supply achieved a good performance with bipolar pulse frequency of 20 kHz and peak voltage of 7 kV, while the rising time is 550 ns and the half-height full-width duration is 420 ns. With surface dielectric barrier discharge (SDBD) load, the peak power of single pulse discharge can reach up to 35 kW, with the highest recorded value of deposited energy per pulse at approximately 0.9 mJ, and a final stable value observed at approximately 0.55 mJ, a uniform multi-streamer discharge was achieved.</div></div>