Circuit topological structure of low-voltage input isolation type multi-circuit output switching power supply

The invention discloses a circuit topological structure of a low-voltage input isolation type multi-circuit output switching power supply. The circuit topological structure comprises a voltage boosting circuit, a power conversion circuit and a rectifying circuit, wherein the voltage boosting circuit is connected with the power conversion circuit; and the power conversion circuit is connected with the rectifying circuit. By virtue of the circuit topological structure, multi-circuit isolation voltage output in a low-voltage input condition is realized, and the product assembling density and the production cost are lowered. 本发明公开了种低电压输入隔离型多路输出开关电源的电路拓扑结构，该电路拓扑结构包括升压电路、功率变换电路和整流电路；所述升压电路连接功率变换电路，所述功率变换电路连接整流电路。本电路实现了在低电压输入的情况下多路隔离电压的输出，降低了产品的组装密度及生产成本。