PURPOSE: To simplify assembly operation by fixing winding drawer parts of power transformer and choke coil directly at power buses.

CONSTITUTION: A power connection structure is composed of power buses 1∼4, winding drawer parts 5a∼5d of a power transformer 5, and winding drawer parts 6a∼6b of a choke coil 6. One ends of said power buses 1 and 2 are connected with winding drawer parts 5a and 5b, 6b, respectively, and ends of power buses 3 and 4, with winding drawer parts 5c and 5d, 6b, respectively. Then, the other ends of respective winding drawer parts 1∼4 are connected with respective terminals of a diode stack 7. Thus, it is possible to constitute a circuit where a high current flows without going via auxiliary minor buses.