SWITCHING POWER SUPPLY APPARATUS
First Claim
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1. A switching power supply apparatus comprising:
- an AC power source configured to supply an AC input voltage;
a first PFC unit includinga first reactor having one end connected to one end of the AC power source,a first series circuit including a first switching element and a second switching element connected in series between the other end of the first reactor and the other end of the AC power source,a second series circuit including a first rectifying element and a capacitor connected in series to both ends of the first switching element, respectively, anda third series circuit including a second rectifying element and the capacitor connected in series to both ends of the second switching element, respectively; and
a control circuit configured to detect a voltage of the AC power source in a voltage waveform, and make the first and second switching elements perform switching in a synchronous rectification switching mode in synchronization with polarities of the voltage waveform when the AC input voltage is equal to or greater than a predetermined voltage value, and make the first and second switching elements operate without synchronization with the polarities when the AC input voltage is smaller than the predetermined voltage value.
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Abstract
A switching power supply is provided to supply an AC input voltage. The supply includes a control circuit configured to detect a voltage of the AC power source in a voltage waveform, and switch elements in a synchronous rectification switching mode in synchronization with polarities of the voltage waveform when the AC input voltage is equal to or greater than a predetermined voltage value. The control unit also operates the switching without synchronization with the polarities when the AC input voltage is smaller than the predetermined voltage value.
10 Citations
5 Claims
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1. A switching power supply apparatus comprising:
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an AC power source configured to supply an AC input voltage; a first PFC unit including a first reactor having one end connected to one end of the AC power source, a first series circuit including a first switching element and a second switching element connected in series between the other end of the first reactor and the other end of the AC power source, a second series circuit including a first rectifying element and a capacitor connected in series to both ends of the first switching element, respectively, and a third series circuit including a second rectifying element and the capacitor connected in series to both ends of the second switching element, respectively; and a control circuit configured to detect a voltage of the AC power source in a voltage waveform, and make the first and second switching elements perform switching in a synchronous rectification switching mode in synchronization with polarities of the voltage waveform when the AC input voltage is equal to or greater than a predetermined voltage value, and make the first and second switching elements operate without synchronization with the polarities when the AC input voltage is smaller than the predetermined voltage value. - View Dependent Claims (2, 3, 4, 5)
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Specification