| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply which can quickly shut off the main power supply circuit by accurately detecting a fault when the power switch is turned ON, and an X-ray CT apparatus using the same power supply. SOLUTION: A switching regulator system power supply comprises a first switch means K1 for opening and closing a main AC power source input circuit, a current limit resistor R1 provided in series with the first switch means for limiting an AC rush current when the power switch is turned ON, a second switch means K2 provided in parallel with the current limit resistor and closed after passage of the first predetermined time ta from the time when the main power supply is turned ON for bypassing a current limit resistor circuit, and a control means 1 for detecting a current value in relation to the AC input and also opening the first switch means K1 when the detected current value exceeds the first predetermined threshold value TH1 after passage of the predetermined time tb from the time when the main power supply is turned ON.
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