公开(公告)号：WO1990002441A1

公开(公告)日：1990-03-08

申请号：PCT/US1989003222

申请日：1989-07-26

Applicant: SUNDSTRAND CORPORATION

Inventor： SUNDSTRAND CORPORATION ,  COOK, Alexander ,  BARNET, Robert

IPC: H02M07/06

CPC classification number: H02J1/102 ,  H02M7/08 ,  Y10T307/729

Abstract: A transformer rectifier unit (10) is provided for developing regulated DC output power from first (26) and second (28) sources of unregulated DC power. The transformer rectifier (20) connectable to a source (16) of AC input power and first (22) and second (24) secondary windings. The first secondary winding (22) develops AC power at a first level and the second secondary winding (24) develops AC power at a second level lower than the first level. First (26) and second (28) rectifier circuits are respectively coupled to the first (22) and second (24) secondary windings for rectifying the AC power therefrom to DC power having corresponding first and second DC levels. A switch S is coupled between an output VR1 of the first rectifier circuit (26) and an output VR2 of the second rectifier circuit (28) and is operable in first and second switching states to provide DC output power from one of the rectifier circuits to a load (14). A pulse-width modulation control circuit (32) is responsive to the difference between a desired DC output level and an actual DC output level and operates the switch (S) between first and second states to provide regulated DC output power. In an alternative embodiment of the invention, the transformer (52) comprises Y- secondary winding sets.