Totem-pole power factor correction circuit, power supply equipment

A totem-pole power factor correction circuit, comprising:

• a first bridge comprising a first switch and a second switch connected in series, a connection point between the first switch and the second switch forming a first connection point;
• a bypass unit connected in parallel with the first bridge and comprising a first diode and a second diode connected in series, a connection point between the first diode and the second diode forming a second connection point, the second connection point being electrically connected to a first terminal of an alternating current power supply;
• a first inductor electrically connected between the first connection point and the second connection point;
• a second bridge connected in parallel with the first bridge and comprising a third switch and a fourth switch connected in series, a connection point between the third switch and the fourth switch forming a third connection point, the third connection point being electrically connected to a second terminal of the alternating current power supply;
• a sampling unit comprising a first sampling resistor electrically connected between the second connection point and an anode of the first diode and a second sampling resistor electrically connected between the second connection point and a cathode of the second diode;
• a detection control unit electrically connected to both terminals of the first sampling resistor and both terminals of the second sampling resistor, respectively;
• wherein when a voltage at both terminals of the first sampling resistor is greater than a preset first voltage or less than the first voltage, the detection control unit outputs one or more control signals to drive the third switch or the fourth switch to turn off;
• when a voltage at both terminals of the second sampling resistor is greater than a preset second voltage or less than the second voltage, the detection control unit outputs the one or more control signals to drive the third switch or the fourth switch to turn off;
• or
• the detection control unit is electrically connected between the anode of the first diode and the first sampling resistor, and between the cathode of the second diode and the second sampling resistor, respectively;
• when the voltage at both terminals of the first sampling resistor and the second sampling resistor connected in series is greater than or less than a preset third voltage, the detection control unit outputs the one or more control signals to drive the third switch and the fourth switch to turn off.