Resonant PWM inverter linked d.c.-d.c. power converter utilizing parasitic circuit constants of high-voltage transformer and cables

Abstract

Abstract A state-of-the-art resonant d.c.-d.c. converter using new power transistors has been incorporated into an X-ray generator applicable to multidiverse X-ray apparatus. This converter consists of a resonant inverter to convert the d.c. voltage to a high-frequency a.c. voltage. It incorporates a high-voltage transformer to boost the inverter output voltage corresponding to a set value, together with a high-voltage rectifier. In practice, the high-voltage transformer includes inherently parasitic impedances such as a magnetizing inductance and leakage inductances, together with stray capacitances which exist between the layers of the secondary windings. This paper is mainly concerned with a resonant high-frequency inverter linked d.c.-d.c. converter which is able to utilize effectively the transformer parasitic impedances as resonant circuit parameters as well as the input capacitance of high-voltage cables as a smoothing capacitor.