US Patent 11152165 Switching module connection structure

A connection structure of a plurality of switching modules that reduces required insulation voltage significantly when the plurality of switching modules is connected to each other in series is proposed. A switching module connection structure includes: n (n≥1, integer) switching modules arranged in two or more columns and all connecting to each other in series from a first switching module in a first column to a last switching module in a last column; and insulating members disposed between at least some switching modules for each column.