| Abstract |
This paper presents a newly developed DC-DC converter for an X-ray power generator with a digitally-controlled resonant PWM inverter. The converter makes use of the parasitic elements of the circuit such as the leakage inductances and secondary-side stray capacitances of the high-voltage transformer , and as the input capacitances of the cables connected to X-ray tube. In order to radiate efficacious X-ray for medical usage, stabilized and low-rippled high- voltage DC, which has to be in the range of 150kV, must be applied to the X-ray tube with speedy response. In addition to this, the major difficulty with the X-ray generator consists in the need to make adjustments for the very wide load range, where the operation is not always in identical resonant mode. The countermeasure for the nonlinear characteristics is essential in this development. The paper discusses the applicable dynamic modeling to simulate the resonant converter circuit behavior and the linearlized compensation methods with the real time software digital control. The experimental results are demonstrated as compared with the computer aided simulation. |
