Switching-mode power supply circuit

A switching mode power supply circuit, comprising a boost inductor, a boost capacitor, a storage capacitor, a transformer or DC-DC inductor, a first switching component, an output rectification component, a filter capacitor, a feedback and control circuit, a first rectification circuit and a second rectification circuit, wherein:

• the first rectification circuit and the storage capacitor form a first rectification loop;
• the second rectification circuit and the boost capacitor form a second rectification loop;
• the first rectification circuit and the storage capacitor and the boost capacitor are connected at terminals of a same polarity;
• the boost inductor, the boost capacitor, the storage capacitor, the transformer or DC-DC inductor, and the first switching component constitute a boost conversion circuit;
• the storage capacitor, the transformer or DC-DC inductor, the first switching component, the output rectification component and the filter capacitor constitute a DC-DC converter;
• when the first switching component conducts, the boost inductor, the boost capacitor and the first switching component form a first boost loop in which the boost inductor stores energy;
• and the storage capacitor, the first switching component and the transformer or DC-DC inductor form a first DC-DC loop;
• when the first switching component cuts off, the boost inductor, the boost capacitor, the storage capacitor and the transformer or DC-DC inductor form a second boost loop;
• and the transformer or DC-DC inductor, the output rectification component and the filter capacitor form a second DC-DC loop;
• the filter capacitor supplies energy to a load;
• the feedback and control circuit is configured to output a chopping wave with a certain frequency and duty to drive the first switching component to conduct or cut off, so as to control an output of voltage or current or power for the load.