Switching power supply architecture

A switching power supply architecture, connected to a power source and supplying electric power to at least one load, the switching power supply architecture providing an output power, and the switching power supply architecture comprising:

• a power factor correction circuit, connected to the power source, the power factor correction circuit configured to adjust a first output voltage based on the output power currently provided, wherein the first output voltage is provided to a post-stage circuit of the power factor correction circuit;
• a resonant conversion circuit, being the post-stage circuit of the power factor correction circuit and receiving the first output voltage, the resonant conversion circuit providing a second output voltage to a post-stage circuit connected to the resonant conversion circuit, and the resonant conversion circuit configured to perform a feedback control based on the second output voltage, and the resonant conversion circuit comparing the second output voltage with a comparison voltage value, wherein when the comparison voltage value is greater than the second output voltage, an operating frequency of the resonant conversion circuit is controlled to be the same as a resonant frequency of the resonant conversion circuit, and when the comparison voltage value is less than the second output voltage, the operating frequency of the resonant conversion circuit is controlled to be greater than the resonant frequency, and the resonant conversion circuit is driven in a burst mode;
• and
• a wide input range step-down circuit, being the post-stage circuit of the resonant conversion circuit and receiving the second output voltage, and the wide input range step-down circuit connected to the at least one load.