Constant Current and Zero Voltage Switching Induction Heater Driver for Variable Beam Injection

摘要

An electronic high frequency induction heater driver for heated fuel injector systems, comprising: a power resonant circuit having first and second nodes, a resonant circuit inductor and a resonant capacitor, the resonant circuit inductor and resonant capacitor being connected in parallel between the first and second nodes, the resonant circuit inductor and Resonant circuit capacitor having values defining a natural frequency at which a voltage between the nodes oscillates between negative and positive values; a loss compensating current source connected to a center tap of the resonant circuit inductor; a first oscillator switch having an open state at which the first Node is isolated from ground, and has a closed state in which the first node is grounded, wherein the first oscillator switch is configured so that it the Zust and essentially changes when the voltage between the nodes goes through zero; anda second oscillator switch having an open state in which the second node is isolated from ground and a closed state in which the second node is grounded, wherein the second oscillator switch is configured to change state substantially when the voltage between the nodes passes through zero, the first and second oscillator switches being further configured to maintain opposite states.