公开(公告)号：JPH07221619A

公开(公告)日：1995-08-18

申请号：JP596995

申请日：1995-01-18

Applicant: ABB MANAGEMENT AG

Inventor： KURISUCHIYAN GERUSHIYUTAA ,  PATORITSUKU HOFUAA ,  RONARUDO ROONAA ,  RETO SHIEEPU

IPC: H03K17/08 ,  H03K17/0812 ,  H03K17/082 ,  H03K17/12

Abstract: PURPOSE: To provide a new method and device for balancing loads of parallel- connected power semiconductor modules by which uniform load distribution can be obtained by taking a difference in parameter and temperature into consid eration without using any additional connection choke. CONSTITUTION: In a method and device for balancing loads of parallel-connected power semiconductor modules, turningon/off times of switches 2 in power semiconductor modules are set so that an even current load may be obtained in all modules during the switching operation. Levels of gate voltages of the modules are also set so that uniform current distribution may be obtained when the switches 2 are conducted. Alternatively, the temperatures Ts of the switches 2 are measured and compared with the maximum allowable temperature Tmax and, when the former Ts is higher than the latter Tmax, the levels of the gate voltages are lowered.