公开(公告)号：US20080019161A1

公开(公告)日：2008-01-24

申请号：US11827196

申请日：2007-07-11

申请人： J. Hoon Lee ,  Hang-Seok Choi ,  Gwan-Bon Koo

发明人： J. Hoon Lee ,  Hang-Seok Choi ,  Gwan-Bon Koo

IPC分类号： H02M7/04

CPC分类号： H02M1/44 ,  H02M3/33507

摘要： In one embodiment, a switching mode power supply (SMPS) includes a rectifier for generating an input DC voltage from an input AC voltage. A switching transistor, coupled to a primary coil of a transformer, converts the input DC voltage and supplies power to a secondary side of the transformer according to an operation of the switching transistor. A switching controller receives a feedback voltage corresponding to a voltage of the secondary side of the transformer, a sense signal corresponding to current flowing at the switching transistor, and a first signal corresponding to a voltage difference between first and second electrodes of the switching transistor. The switching controller controls the turning on and off of the switching transistor. After the switching transistor is turned off, the switching controller detects and counts a number of times that a voltage level of the first signal and a reference voltage are equal. The switching controller causes the switching transistor to turn-on when the count of the number of times reaches a variable reference number.

摘要翻译： 在一个实施例中，开关模式电源（SMPS）包括用于从输入AC电压产生输入DC电压的整流器。 耦合到变压器的初级线圈的开关晶体管根据开关晶体管的操作转换输入直流电压并将功率供应到变压器的次级侧。 开关控制器接收对应于变压器的次级侧的电压的反馈电压，对应于在开关晶体管流动的电流的感测信号，以及对应于开关晶体管的第一和第二电极之间的电压差的第一信号。 开关控制器控制开关晶体管的导通和截止。 在开关晶体管截止之后，开关控制器检测并计数第一信号和参考电压的电压电平相等的次数。 当数量的计数达到可变参考数时，开关控制器使开关晶体管导通。

公开(公告)号：US07768802B2

公开(公告)日：2010-08-03

申请号：US11827196

申请日：2007-07-11

申请人： J. Hoon Lee ,  Hang-Seok Choi ,  Gwan-Bon Koo

发明人： J. Hoon Lee ,  Hang-Seok Choi ,  Gwan-Bon Koo

IPC分类号： H02M3/335

CPC分类号： H02M1/44 ,  H02M3/33507

摘要： In one embodiment, a switching mode power supply (SMPS) includes a rectifier for generating an input DC voltage from an input AC voltage. A switching transistor, coupled to a primary coil of a transformer, converts the input DC voltage and supplies power to a secondary side of the transformer according to an operation of the switching transistor. A switching controller receives a feedback voltage corresponding to a voltage of the secondary side of the transformer, a sense signal corresponding to current flowing at the switching transistor, and a first signal corresponding to a voltage difference between first and second electrodes of the switching transistor. The switching controller controls the turning on and off of the switching transistor. After the switching transistor is turned off, the switching controller detects and counts a number of times that a voltage level of the first signal and a reference voltage are equal. The switching controller causes the switching transistor to turn-on when the count of the number of times reaches a variable reference number.

摘要翻译： 在一个实施例中，开关模式电源（SMPS）包括用于从输入AC电压产生输入DC电压的整流器。 耦合到变压器的初级线圈的开关晶体管根据开关晶体管的操作转换输入直流电压并将功率供应到变压器的次级侧。 开关控制器接收对应于变压器的次级侧的电压的反馈电压，对应于在开关晶体管流动的电流的感测信号，以及对应于开关晶体管的第一和第二电极之间的电压差的第一信号。 开关控制器控制开关晶体管的导通和截止。 在开关晶体管截止之后，开关控制器检测并计数第一信号和参考电压的电压电平相等的次数。 当数量的计数达到可变参考数时，开关控制器使开关晶体管导通。