This paper presents a detailed description on the system configuration and power supply circuit of the power supply equipment for large scale computor. The large scale computor developed recentl3r employs a large number of LSIs to realize high speed performance and miniaturization. A highly-accurate voltage stability under low voltage and high current conditions is required for the power supply equipment used for such a computor. For example, the output current exceeds 1500A at an output voltage of 5V, while the necessary voltage accuracy is ± 1.5% or less. The off-line switching regulator (the operating frequency is 20kHz) has been adopted as the power supplying technique. The stabilization technique of output voltage is based on SR control using a saturable reactor in the constrained mode.
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