公开(公告)号：US06737842B2

公开(公告)日：2004-05-18

申请号：US10268912

申请日：2002-10-11

申请人： Yuming Bai ,  Nick Sun ,  Alex Q. Huang

发明人： Yuming Bai ,  Nick Sun ,  Alex Q. Huang

IPC分类号： G05F1656

CPC分类号： H02M3/1588 ,  H02M1/38 ,  Y02B70/1466

摘要： A buck regulator having a voltage sensor for sensing a voltage reversal caused by freewheeling current from an output inductor in the regulator. Upon sensing a reversed voltage, the voltage sensor triggers a gate controller to turn on a switch in the regulator, and thereby terminate a dead time. The voltage sensor and gate controller are high speed circuits, and therefore can reduce the duration of the dead time. Reducing the dead time duration improves efficiency by reducing the duration of body diode conduction. The dead time can be reduced to less than a turn-on time of the body diode, thereby preventing charge buildup in the body diode, and, consequently, preventing reverse recovery loss in the body diode. The present invention improves electrical conversion efficiency, and allows for increased operating frequency in buck regulators.

摘要翻译： 具有用于感测由调节器中的输出电感器的续流电流引起的电压反转的电压传感器的降压调节器。 在感测到反向电压时，电压传感器触发门控制器以打开调节器中的开关，从而终止死区时间。 电压传感器和门控制器是高速电路，因此可以减少死区时间。 减少死区时间可以通过减少体二极管导通的持续时间来提高效率。 死区时间可以减小到小于体二极管的导通时间，从而防止体二极管中的电荷累积，并且因此防止体二极管中的反向恢复损耗。 本发明提高了电转换效率，并且允许在降压调节器中提高工作频率。