公开(公告)号：US06781852B2

公开(公告)日：2004-08-24

申请号：US10304783

申请日：2002-11-26

申请人： Masaharu Hatta ,  Haruhiko Hatakeyama ,  Masato Watanabe

发明人： Masaharu Hatta ,  Haruhiko Hatakeyama ,  Masato Watanabe

IPC分类号： H02M3335

CPC分类号： H02M3/28 ,  H02M1/36 ,  H02M3/33592 ,  H02M3/3376 ,  H02M2001/0006 ,  H02M2001/007 ,  Y02B70/1475

摘要： A switching power supply which can prevent the output voltage Vout from fluctuating or undershooting when the instruction for stopping the operation is issued is disclosed. A switching power supply according to the present invention employs a transformer having a primary coil and a secondary coil, a switching circuit connected between an input terminal and the primary coil of the transformer, a rectifier connected to the secondary coil of the transformer, a smoothing circuit located at a subsequent stage of the rectifier and including an output capacitor, a control circuit controlling the switching circuit, and an operating voltage generating circuit, responsive to an instruction for stopping a switching operation, for supplying an operating voltage to the control circuit using at least energy stored in the output capacitor. Thus, the switching power supply of the present invention can substantially linearly lower the output voltage Vout.

摘要翻译： 公开了当发出用于停止操作的指令时可以防止输出电压Vout波动或下冲的开关电源。 根据本发明的开关电源采用具有初级线圈和次级线圈的变压器，连接在变压器的输入端子和初级线圈之间的开关电路，连接到变压器的次级线圈的整流器，平滑 位于整流器的后级，并且包括输出电容器，控制开关电路的控制电路和响应于停止开关操作的指令的工作电压产生电路，用于向控制电路提供工作电压，所述控制电路使用 至少能量存储在输出电容器中。 因此，本发明的开关电源可以实质上线性地降低输出电压Vout。

公开(公告)号：US20060114698A1

公开(公告)日：2006-06-01

申请号：US11272891

申请日：2005-11-14

申请人： Haruhiko Hatakeyama

发明人： Haruhiko Hatakeyama

IPC分类号： H02M3/335

CPC分类号： H02M3/33523 ,  H02M2001/0032 ,  Y02B70/16

摘要： A first side circuit connected to a primary coil of a transformer includes a main switching element driving the primary coil, and a control circuit which detects an output voltage to feedback and drives and controls the main switching element so as to keep constant the output voltage by acquiring a voltage induced in a tertiary coil of the transformer. A secondary side circuit of the transformer includes a dummy load circuit connected to the output terminal, a detection circuit which detects a secondary coil voltage of the transformer, and a dummy load control circuit which is controlled by the detection circuit and controls so as to flow current flow through the dummy load circuit only in a state of a light load.

摘要翻译： 连接到变压器的初级线圈的第一侧电路包括驱动初级线圈的主开关元件和控制电路，该控制电路检测输出电压以反馈并驱动和控制主开关元件，以便通过 获取在变压器的三次线圈中感应的电压。 变压器的次级侧电路包括连接到输出端子的虚拟负载电路，检测变压器的次级线圈电压的检测电路和由检测电路控制并控制以便流过的虚拟负载控制电路 仅在轻负载状态下通过虚拟负载电路的电流流动。

公开(公告)号：US6064580A

公开(公告)日：2000-05-16

申请号：US262917

申请日：1999-03-05

申请人： Haruo Watanabe ,  Haruhiko Hatakeyama

发明人： Haruo Watanabe ,  Haruhiko Hatakeyama

IPC分类号： H02M3/335 ,  H02M7/04 ,  H02M7/217

CPC分类号： H02M3/33592 ,  Y02B70/1475

摘要： A switching power supply has first and second switching elements that are alternately turned on to cause an alternating current to flow through a primary winding of a transformer. The alternating current flowing through the primary winding induces voltages respectively across first and second secondary windings of the transformer. Synchronous rectifying transistors are turned on by the voltages induced across the first and second secondary windings, causing a current to flow alternately through the first and second secondary windings. Either one of the first and second switching elements is turned on while the other is being turned off, except for short off-times in which both the first and second switching elements are prevented from being turned on. As a result, when currents flow through the first and second secondary windings, the synchronous rectifying transistors are turned on. Therefore, no current flows through internal parasitic diodes of the synchronous rectifying transistors, and hence any loss caused thereby is very small.

摘要翻译： 开关电源具有交替导通以使交流电流流过变压器的初级绕组的第一和第二开关元件。 流过初级绕组的交流电流分别在变压器的第一和第二次级绕组上引起电压。 同步整流晶体管由在第一和第二次级绕组两端感应的电压导通，导致电流交替地流过第一和第二次级绕组。 第一开关元件和第二开关元件中的任何一个都被接通而另一个被截止，除了防止第一和第二开关元件被导通的短时间之外。 结果，当电流流过第一和第二次级绕组时，同步整流晶体管导通。 因此，没有电流流过同步整流晶体管的内部寄生二极管，因此由此引起的任何损耗非常小。

公开(公告)号：US07158391B2

公开(公告)日：2007-01-02

申请号：US11272891

申请日：2005-11-14

申请人： Haruhiko Hatakeyama

发明人： Haruhiko Hatakeyama

IPC分类号： H02M3/335

CPC分类号： H02M3/33523 ,  H02M2001/0032 ,  Y02B70/16

摘要： A first side circuit connected to a primary coil of a transformer includes a main switching element driving the primary coil, and a control circuit which detects an output voltage to feedback and drives and controls the main switching element so as to keep constant the output voltage by acquiring a voltage induced in a tertiary coil of the transformer. A secondary side circuit of the transformer includes a dummy load circuit connected to the output terminal, a detection circuit which detects a secondary coil voltage of the transformer, and a dummy load control circuit which is controlled by the detection circuit and controls so as to flow current flow through the dummy load circuit only in a state of a light load.

摘要翻译： 连接到变压器的初级线圈的第一侧电路包括驱动初级线圈的主开关元件和控制电路，该控制电路检测输出电压以反馈并驱动和控制主开关元件，以便通过 获取在变压器的三次线圈中感应的电压。 变压器的次级侧电路包括连接到输出端子的虚拟负载电路，检测变压器的次级线圈电压的检测电路和由检测电路控制并控制以便流过的虚拟负载控制电路 仅在轻负载状态下通过虚拟负载电路的电流流动。