Patent ID: 8536843
Filing Date: 2013-09-17
Classification: H02M,Y02B

Abstract:
1. A power supply circuit comprising: a positive-side output terminal; a negative-side output terminal; a first power supply circuit comprising first and second alternating current input lines between which an alternating current voltage is applied, a first bridge circuit comprising first, second, third and fourth rectifying devices each of which is connected to the first or second alternating current input line and generating an output voltage between the positive-side output terminal and the negative-side output terminal by full-wave rectifying the alternating current voltage, a first switching device connected in parallel with the first rectifying device that is connected with the negative-side output terminal, and a second switching device connected in parallel with the second rectifying device that is connected with the negative-side output terminal; a second power supply circuit comprising a third alternating current input line connected with the first alternating current input line, a fourth alternating current input line connected with the second alternating current input line, a second bridge circuit comprising fifth, sixth, seventh and eighth rectifying devices each of which is connected to the third or fourth alternating current input line and generating an output voltage between the positive-side output terminal and the negative-side output terminal, a third switching device connected in parallel with the fifth rectifying device that is connected with the negative-side output terminal and a fourth switching device connected in parallel with the sixth rectifying device that is connected with the negative-side output terminal; and a switching control circuit controlling switching timings of the first, second, third and fourth switching devices so that the first switching device and the third switching device are turned on and off at timings different from each other when the alternating current voltage on the first alternating current input line is positive relative to the alternating current voltage on the second alternating current input line and the second switching device and the fourth switching device are turned on and off at timings different from each other when the alternating current voltage on the first alternating current input line is negative relative to the alternating current voltage on the second alternating current input line.