Totem pole PFC circuit control method, totem pole PFC circuit control device and power supply circuit

The invention discloses a totem-pole PFC circuit control method and device and a power supply circuit, and belongs to the technical field of power supply, and the method comprises the steps: determining an output voltage reference value and an output voltage sampling value of a totem-pole PFC circuit; determining a current switching period of the totem-pole PFC circuit according to the output voltage reference value and the output voltage sampling value, wherein the period time of the current switching period comprises main conduit conduction time and main conduit turn-off time required for meeting a critical conduction mode; and controlling the on-off of each switch tube in the totem pole PFC circuit in the current switching period according to the conduction time of the main conduit and the turn-off time of the main conduit. The totem-pole PFC control circuit solves the problem that a complex current zero-cross detection circuit is needed to control the on-off of a switch tube in a totem-pole PFC. 本发明公开了一种图