Power factor correction circuit and power supply device

The power factor correction circuit according to claim. 2, wherein

• the first transistor is an IGBT or a bipolar transistor having a first conduction terminal connected to the first node, and a second, conduction terminal connected to the connection node,
• the second transistor is an IGBT or a bipolar transistor having a second conduction terminal connected to the connection node, and a first conduction terminal connected to the second node,
• the first conduction terminal is one of an emitter terminal and a collector terminal, and
• the second conduction terminal is the other of the emitter terminal and the collector terminal.

The power factor correction circuit according to claim. 1, wherein

• the switch circuit includes
• a first transistor connected between a first node and a second node, and
• a second transistor connected between the second node and a third, node,
• the power factor correction circuit further comprises:
• a mode switching circuit having one end connected to the second node, and the other end connected to the intermediate node, the circuit being brought into an on-state in the first operation mode and into an off-state in the second operation mode;
• a first rectifier element connected between the first node and the one end of the first capacitor so as to allow a current to flow from a first node side;
• a second rectifier element connected between the third node and the other end of the second, capacitor so as to allow a current to flow to a third node side;
• a third rectifier element connected between the first node and a fourth node so as to allow a current to flow to the first node side;
• and
• a fourth rectifier element connected between the third node and the fourth node so as to allow a current to flow from the third node side, and
• the coil is connected at least one of between the second input terminal and the second node, and between the first input terminal and the fourth node.

A power factor correction circuit comprising:

• first and second input terminals;
• first and second output terminals;
• a coil;
• a bidirectional switch that includes first and second transistors connected in anti-series, the bidirectional switch having one end connected to a first node, and the other end connected to a second node;
• a first capacitor having one end connected to the first output terminal, and the other end connected to the second node;
• a second capacitor having one end connected to the second node, and the other end connected to the second output terminal;
• a first rectifier element connected between the first node and the one end of the first capacitor so as to allow a current to flow from a first node side;
• and
• a second rectifier element connected between the first node and the other end of the second capacitor so as to allow a current to flow to the first node side, wherein
• the power factor correction circuit has a current path between the first and second input terminals via the coil and the bidirectional switch, and
• the coil is connected, at least one of between the first input terminal and the first node, and between the second node and the second, input terminal.

A power factor correction circuit comprising:

• first and second input terminals;
• first and second output terminals;
• a coil;
• a first bidirectional switch that includes first and second transistors connected in anti-series, the first bidirectional switch having one end connected to a first node, and the other end connected to a second node;
• a first capacitor having one end connected to the first output terminal, and the other end connected to a third node;
• a second capacitor having one end connected to the third node, and the other end connected to the second output terminal;
• a second bidirectional switch connected between the second node and the third node;
• a first rectifier element connected between the first node and the one end of the first capacitor so as to allow a current to flow from, a first node side;
• a second, rectifier element connected between, the first node and the other end of the second capacitor so as to allow a current to flow to the first node side;
• a third rectifier element connected between the second node and the one end of the first capacitor so as to allow a current to flow from a second node side;
• and
• a fourth rectifier element connected between the second node and the other end of the second capacitor so as to allow a current to flow to the second node side, wherein
• the power factor correction circuit has a current path between the first and second input terminals via the coil and the first bidirectional switch, and
• the coil is connected at least one of between the first input terminal and the first node, and between, the second node and the second input terminal.