High-voltage power supply for x-ray computed tomography and time-delay compensation of cockcroft-walton circuit Yuki Kajiuchi and Toshihiko Noguchi Canon Medical Systems Corporation, Tochigi, Japan. 2Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, Hamamatsu, Japan.
Abstract.
In recent years, an image diagnostic apparatus using X-ray is intensively investigated
to reduce the radiation exposures amount. Above all, high-speed control of the high voltage
generator to control the X-ray output is a very important issue. A Cockcroft-Walton circuit (CW
circuit) is one of the method to generate the high voltage output. However, it has problem of the
long time delay in the output response due to the huge capacitive component of the CW circuit.
Therefore, it is required to achieve the stable output voltage with a quick transient response,
which can be obtained by the time delay compensation technique of the CW circuit. This paper
proposes an application of a Smith method to compensate for the time delay of the CW circuit
output to reduce the undesirable excessive radiation exposure. AS a result of verification through
the computer simulation, it has been confirmed that the overshoot of the output voltage can
effectively be suppressed and that the optimal response can be realized without sacrificing the
high-speed response. The paper indicates some possibilities of further improvement of the CW
circuit output response by introducing the more precise compensation technique to the X-ray
computed tomography.
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