公开(公告)号：US5783930A

公开(公告)日：1998-07-21

申请号：US782432

申请日：1997-01-15

申请人： Larry T. Albert ,  Frank Faez Athari

发明人： Larry T. Albert ,  Frank Faez Athari

IPC分类号： H02J7/02 ,  H02J7/04 ,  H02J7/16

CPC分类号： H02J7/022

摘要： A self-oscillating buck mode battery charger apparatus 10. The apparatus 10 includes a main switching transistor 22, a first control transistor 34 and a second control transistor 36. The control transistors 34 and 36 are arranged such that neither control transistor sees the full input mains voltage across input terminals 12 of the apparatus 10 when the switching transistor 22 is turned off. An alternative embodiment of the invention includes a high and low main sensing circuit 102 in which a controller 120 is used to detect an excessively high mains voltage condition as well as an undesirably low mains voltage condition. The controller 120 turns off a PWM control circuit 104 when either condition is present for a predetermined length of time. Turning off the PWM control circuit 104 causes the main switching transistor 106 to be turned off, thereby preventing damage to the components of the charger apparatus 100. The charger apparatus is especially well-suited for applications where a rectified DC mains voltage is used to provide a charging current to a rechargeable battery.

摘要翻译： 自振荡降压模式电池充电器装置10.装置10包括主开关晶体管22，第一控制晶体管34和第二控制晶体管36.控制晶体管34和36被布置成使得控制晶体管看不到全输入 当开关晶体管22断开时，设备10的输入端子12两端的电源电压。 本发明的一个替代实施例包括高低的主感测电路102，其中控制器120用于检测过高的电源电压状况以及不期望的低电源电压状况。 当任一条件存在预定时间长度时，控制器120关断PWM控制电路104。 关闭PWM控制电路104使得主开关晶体管106截止，从而防止对充电器装置100的部件的损坏。充电器装置特别适用于使用整流的直流电源电压来提供 充电电流到可充电电池。