A power supply circuit comprising: first and second power supply lines (LH1, LL1) that are connected to an inductive load; an input line (L1, L2) that is connected to an alternating-current power supply; a first conversion section that converts, into a first direct-current voltage, an alternating-current voltage input from said input line (L1, L2), and applies said first direct-current voltage between said first and said second power supply lines (LH1, LL1), said first power supply line being employed as a positive pole; a diode that has a cathode and an anode, and is arranged between said first and said second power supply lines (LH1, LL1) such that said anode faces toward said first power supply line side; a capacitor that has both ends connected to a direct-current load, and is connected in series with said diode between said first and said second power supply lines (LH1, LL1); a switch section that is provided on said input line (L1, L2), and selects conduction/non-conduction between said alternating-current power supply and said first conversion section; a second conversion section that converts, into a second direct-current voltage, said alternating-current voltage input without passing through said switch section, and is connected to a connection point located between said capacitor and said diode to apply said second direct-current voltage to said capacitor. a second input line that is connected to the alternating-current power supply; characterized by a second switch section that selects between a first state where said second conversion section is connected to said input line (L1, L2) and a second state where said second conversion section is connected to said second input line; a filter; and a power supply circuit that is configured to input said alternating-current power supply from said second input line, wherein said input line (L1, L2) is connected to said alternating-current power supply through said filter, and said second input line is connected to said alternating-current power supply without involving said filter. first and second power supply lines (LH1, LL1) that are connected to an inductive load; an input line (L1, L2) that is connected to an alternating-current power supply; a first conversion section that converts, into a first direct-current voltage, an alternating-current voltage input from said input line (L1, L2), and applies said first direct-current voltage between said first and said second power supply lines (LH1, LL1), said first power supply line being employed as a positive pole; a diode that has a cathode and an anode, and is arranged between said first and said second power supply lines (LH1, LL1) such that said anode faces toward said first power supply line side; a capacitor that has both ends connected to a direct-current load, and is connected in series with said diode between said first and said second power supply lines (LH1, LL1); a switch section that is provided on said input line (L1, L2), and selects conduction/non-conduction between said alternating-current power supply and said first conversion section; a second conversion section that converts, into a second direct-current voltage, said alternating-current voltage input without passing through said switch section, and is connected to a connection point located between said capacitor and said diode to apply said second direct-current voltage to said capacitor. a second input line that is connected to the alternating-current power supply; characterized by a second switch section that selects between a first state where said second conversion section is connected to said input line (L1, L2) and a second state where said second conversion section is connected to said second input line; a filter; and a power supply circuit that is configured to input said alternating-current power supply from said second input line, wherein said input line (L1, L2) is connected to said alternating-current power supply through said filter, and said second input line is connected to said alternating-current power supply without involving said filter.