| 摘要 |
PURPOSE:To enhance the safety and the reliability of a power source by regulating voltage and current limiting means of the main bodies of a protection section, and then constructing so that predetermined output characteristic is obtained by the limiting means. CONSTITUTION:A power source converts the power of a commercial power source 1 by a rectifying and smoothing unit 2 to DC, and applies it to a switching element 3. The element 3 is connected in series with a current detector 4 and an inductance 5, and turned ON, OFF by a controller 9. A current I thus intermittently fed is so converted by the inductance 5 and a rectifying and smoothing unit 6 as to apply a predetermined DC voltage E to a load 8 through the series circuit. The voltage E is monitored by a voltage detector 7, and output to the controller 9. The controller 9 has a logic unit 93, a time limiter 92 and an output unit 91, and turns OFF the element 3 when a logic output D is '0'. Thus, the safety and the reliability of the power source are enhanced.
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