PFC circuit, PFC apparatus, power module, and integrated inductor

A power factor correction (PFC) circuit, comprising a rectifier unit, S PFC branches, a filter capacitor, and an integrated inductor, wherein:

• the integrated inductor comprises a magnetic core, S first windings, and S second windings, wherein:
• each of the S PFC branches comprises one first winding in the S first windings, a diode, and a first switch,
• the diode and the first switch in each PFC branch are connected in series and then connected in parallel to the filter capacitor,
• a first end of the first winding in each PFC branch is connected to a first output end of the rectifier unit,
• a second end of the first winding in each PFC branch is connected to a point at which the diode and the first switch in the PFC branch are connected in series, and
• the S second windings form a balancing unit, wherein a first end of the balancing unit is connected to a second output end of the rectifier unit, and a second end of the balancing unit is connected to a point at which the filter capacitor and the first switch are connected;
• and
• the magnetic core comprises M+1 first magnetic yokes sequentially arranged in parallel, wherein:
• the S first windings and the S second windings are disposed in spaces formed by any two adjacent first magnetic yokes of the M+1 first magnetic yokes,
• two adjacent first magnetic yokes corresponding to a space in which the S first windings are located are the same,
• two adjacent first magnetic yokes corresponding to a space in which the S second windings are located are the same, and
• one of the two adjacent first magnetic yokes corresponding to the space in which the S first windings are located is different from the two adjacent first magnetic yokes corresponding to the space in which the S second windings are located,
• wherein M is an integer greater than or equal to 2.

A power device, comprising a direct current (DC/DC) converter and a power factor correction (PFC) circuit, wherein:

• an output end of the PFC circuit is connected to an input end of the DC/DC converter;
• the DC/DC converter is configured to perform DC/DC conversion based on a direct current voltage provided by the PFC circuit;
• the PFC circuit comprises S first bridge arms, a second bridge arm, a voltage stabilization capacitor, and an integrated inductor, wherein:
• the S first bridge arms, the second bridge arm, and the voltage stabilization capacitor are connected in parallel,
• the integrated inductor comprises a magnetic core, S first windings, and S second windings, wherein:
• first ends of the S first windings are all configured to connect to a first end of an alternating current power supply,
• second ends of the S first windings are respectively connected to midpoints of the S first bridge arms, and
• the S second windings form a balancing unit, wherein a first end of the balancing unit is configured to connect to a second end of the alternating current power supply, and a second end of the balancing unit is connected to a midpoint of the second bridge arm,
• wherein S is an integer greater than or equal to 1;
• and
• the magnetic core comprises M+1 first magnetic yokes sequentially arranged in parallel, wherein:
• the S first windings and the S second windings are respectively disposed in spaces formed by any two adjacent first magnetic yokes of the M+1 first magnetic yokes,
• two adjacent first magnetic yokes corresponding to a space in which the S first windings are located are the same,
• two adjacent first magnetic yokes corresponding to a space in which the S second windings are located are the same, and
• one of the two adjacent first magnetic yokes corresponding to the space in which the S first windings are located is different from the two adjacent first magnetic yokes corresponding to the space in which the S second windings are located,
• wherein M is an integer greater than or equal to 2.