A power-oscillator-starting circuit for an electronic high frequency induction-heater driver. The induction-heater driver, upon receipt of a turn-on signal, generates a high frequency alternating current, wherein the alternating current through an induction-heater coil is magnetically coupled to an appropriate loss component for a variable-spray fuel-injection system. The induction-heater driver uses a power oscillator that is started and restarted as is appropriate based on a threshold current limit referenced to the supply voltage of the induction-heater driver.