| 摘要 |
<p>The present invention is a power supply circuit which can interrupt the supply of an operating voltage to an inductive load regardless of the supply of the operating voltage to a direct-current load and can be manufactured at a reduced cost. A first conversion section (11) converts an alternating-current voltage that is input through input lines (L1, L2) into a first direct-current voltage and applies the first direct-current voltage to any part between power supply lines (LH1, LL1). A diode (D1) is arranged between the power supply lines (LH1, LL1) in such a manner that an anode of the diode (D1) faces toward the power supply line (LH1). A capacitor (C1) has direct-current loads (22) connected to both ends thereof, and is connected in-series to the diode (D1). A switch section (S1) chooses between electrical connection and electrical non-connection between an alternating-current power supply (E1) and the first conversion section (11). A second conversion section (12) converts an alternating-current voltage that is input without passing through the switch section (S1) into a second direct-current voltage, and is connected to a connection point (P1) located between the capacitor (C1) and the diode (D1) so that the second direct-current voltage can be applied to the capacitor (C1).</p> |
