A switched tank converter (1, 3, 4, 5), wherein the switched tank converter (1, 3, 4, 5) comprises N conversion units, which are arranged in N stages, wherein N is larger than or equal to 3, each conversion unit is selected from one of a first-type conversion unit and a second-type conversion unit, and each conversion unit comprises: an input end; an output end; a support capacitor having a first end and a second end, wherein the first end of the support capacitor is electrically connected with the output end; a half-bridge inverter circuit, wherein a first end of the half-bridge inverter circuit is electrically connected with the input end, and a second end of the half-bridge inverter circuit is electrically connected with the output end; a half-bridge rectifier circuit, wherein a first end of the half-bridge rectifier circuit is electrically connected with a ground end, and a second end of the half-bridge rectifier circuit is electrically connected with the first end of the support capacitor of the first-stage conversion unit; and a resonant circuit, wherein a first end of the resonant circuit is electrically connected with a middle point of the half-bridge inverter circuit, and a second end of the resonant circuit is electrically connected with a middle point of the half-bridge rectifier circuit, wherein the second end of the support capacitor of each first-type conversion unit is electrically connected with the ground end, and each second-type conversion unit comprises a half-bridge clamping circuit, wherein a first end of the half-bridge clamping circuit is electrically connected with the ground end, and a middle point of the half-bridge clamping circuit is electrically connected with the second end of the support capacitor of the second-type conversion unit, wherein the output end of each conversion unit is electrically connected with the input end of a next-stage conversion unit, the output end of the first-stage conversion unit is electrically connected with a load end, the first-stage conversion unit is the first-type conversion unit, and the input end of the N th -stage conversion unit is electrically connected with a power end, wherein at least one conversion unit of the third-stage conversion unit to the N th -stage conversion unit is the second-type conversion unit, characterized in that the second end of the half-bridge clamping circuit of each second-type conversion unit of the second-stage conversion unit to the N th -stage conversion unit is electrically connected with the first end of the support capacitor of a lower-stage conversion unit, and the second end of the half-bridge clamping circuit of at least one second-type conversion unit of the third-stage conversion unit to the N th -stage conversion unit is not electrically connected with the first end of the support capacitor of the first-stage conversion unit. an input end; an output end; a support capacitor having a first end and a second end, wherein the first end of the support capacitor is electrically connected with the output end; a half-bridge inverter circuit, wherein a first end of the half-bridge inverter circuit is electrically connected with the input end, and a second end of the half-bridge inverter circuit is electrically connected with the output end; a half-bridge rectifier circuit, wherein a first end of the half-bridge rectifier circuit is electrically connected with a ground end, and a second end of the half-bridge rectifier circuit is electrically connected with the first end of the support capacitor of the first-stage conversion unit; and a resonant circuit, wherein a first end of the resonant circuit is electrically connected with a middle point of the half-bridge inverter circuit, and a second end of the resonant circuit is electrically connected with a middle point of the half-bridge rectifier circuit, wherein the second end of the support capacitor of each first-type conversion unit is electrically connected with the ground end, and each second-type conversion unit comprises a half-bridge clamping circuit, wherein a first end of the half-bridge clamping circuit is electrically connected with the ground end, and a middle point of the half-bridge clamping circuit is electrically connected with the second end of the support capacitor of the second-type conversion unit, wherein the output end of each conversion unit is electrically connected with the input end of a next-stage conversion unit, the output end of the first-stage conversion unit is electrically connected with a load end, the first-stage conversion unit is the first-type conversion unit, and the input end of the N th -stage conversion unit is electrically connected with a power end, wherein at least one conversion unit of the third-stage conversion unit to the N th -stage conversion unit is the second-type conversion unit, characterized in that the second end of the half-bridge clamping circuit of each second-type conversion unit of the second-stage conversion unit to the N th -stage conversion unit is electrically connected with the first end of the support capacitor of a lower-stage conversion unit, and the second end of the half-bridge clamping circuit of at least one second-type conversion unit of the third-stage conversion unit to the N th -stage conversion unit is not electrically connected with the first end of the support capacitor of the first-stage conversion unit.