Buck-Boost type single-switch multi-channel constant current switch converter

The utility model discloses a Buck-Boost type single-switch multi-path constant current switch converter, and relates to a single-switch multi-path constant current switch converter. The switching converter is formed by integrating a pre-stage Buck-Boost power factor correction (PFC) converter and a post-stage resonant multi-path current-sharing output DC-DC converter through an active switch, so that a topological structure and a control loop are simplified. According to the switching converter, current sharing control of multi-path output is realized by utilizing charge balance of the resonant capacitor, so that the other output branches can realize automatic current sharing only by controlling the current of one output branch. A broadband wide voltage mode control loop is utilized, the influence of the output voltage ripple of the Buck-Boost PFC converter on each output branch is eliminated, and multi-path low-current ripple output is realized. 本实用新型公开了一种Buck-Boost型单开关多路恒流开关变换器。该开关变换器由前级Buck-Boost功率因数校正(po