High-voltage DC-DC conversion device based on multi-winding transformer

The invention discloses a high-voltage DC-DC converter based on a multi-winding transformer. The high-voltage DC-DC conversion device comprises an input cascade converter unit, a multi-winding medium- and low-frequency sinusoidal transformer and an input parallel converter unit. The high-voltage DC-DC converter comprises at least one first converter submodule the same in structure. The input ends of the first converter submodules are connected between the high-voltage anode and the high-voltage cathode after being positively and serially connected in sequence. The multi-winding medium- and low-frequency sinusoidal transformer comprises at least one input winding and at least one output winding. The input windings are as many as the first converter submodules and are in one-to-one correspondence to the first converter submodules. The input parallel converter unit comprises at least one second converter submodules the same in structure. The input ends of the second converter submodules are all connected to the output windings of the multi-winding medium- and low-frequency sinusoidal transformer. Through the use of the high-voltage DC-DC conversion device, the voltage standing problem and the voltage sharing problem in high-voltage switching devices of the existing high-voltage DC-DC conversion equipment are solved, and the problem that the existing DC-DC conversion equipment is insufficient in transmission capacity is also solved.