公开(公告)号：US20140192560A1

公开(公告)日：2014-07-10

申请号：US13735481

申请日：2013-01-07

Applicant: Analog Devices Technology

Inventor： YINGYANG OU ,  RENJIAN XIE ,  HUAILIANG SHENG

IPC: H03K3/017 ,  H02M3/335

CPC classification number: H02M1/08 ,  H02M1/40 ,  H02M3/33507 ,  H02M3/33576 ,  H02M2007/4803 ,  H03K17/56

Abstract: A duty cycle balance module (DCBM) for use with a switch mode power converter. One possible half-bridge converter embodiment includes a transformer driven to conduct current in first and second directions by first and second signals during and second half-cycles, respectively. A current limiting mechanism adjusts the duty cycles of the first and second signals when a sensed current exceeds a predetermined limit threshold. The DCBM receives signals representative of the duty cycles which would be used if there were no modification by the current limiting mechanism and signals Dact—1 and Dact—2 representative of the duty cycles that are actually used for the first and second signals, and outputs signals Dbl—1 and Dbl—2 which modify signals Dact—1 and Dact—2 as needed to dynamically balance the duty cycles of the first and second signals and thereby reduce flux imbalance in the transformer that might otherwise arise.

Abstract translation: 用于开关模式功率转换器的占空比平衡模块（DCBM）。 一个可能的半桥转换器实施例包括分别被驱动以在第一和第二方向通过第一和第二信号在第一和第二半周期期间传导电流的变压器。 当感测电流超过预定极限阈值时，电流限制机构调节第一和第二信号的占空比。 DCBM接收代表占空比的信号，如果没有通过电流限制机制进行修改，并且表示实际用于第一和第二信号的占空比的Dact-1和Dact-2信号，以及输出 信号Dbl-1和Dbl-2，其根据需要修改信号Dact-1和Dact-2，以动态平衡第一和第二信号的占空比，从而减少可能出现的变压器中的通量不平衡。