公开(公告)号：US09270166B2

公开(公告)日：2016-02-23

申请号：US14132518

申请日：2013-12-18

Applicant: TDK Corporation

Inventor： YueQing Wang

IPC: H02M7/23 ,  H02M1/42 ,  H02M1/12

CPC classification number: H02M1/4225 ,  H02M7/23 ,  H02M2001/123 ,  Y02B70/126 ,  Y02P80/112

Abstract: A power factor improvement circuit is configured with two series circuits each having a switching element and a rectifying element connected in series. Two input terminals of a single-phase AC power source are respectively connected between the switching elements and the rectifying elements in the series circuits. An inductor element is connected between an output terminal of the power factor improvement circuit and two terminals, which are on the other side of the rectifying elements, of the switching elements. A capacitor element is connected between the output terminal and the two terminals. According to the above configuration, it is possible to decrease a loss of a bridge circuit and common-mode noise, and to provide a power factor improvement circuit in a smaller size.

Abstract translation: 功率因数改善电路配置有两个串联电路，每个串联电路具有串联连接的开关元件和整流元件。 单相交流电源的两个输入端分别连接在串联电路中的开关元件和整流元件之间。 电感器元件连接在功率因数改善电路的输出端子和位于整流元件的另一侧的两个端子之间的开关元件。 电容元件连接在输出端子和两个端子之间。 根据上述结构，可以减小桥接电路的损耗和共模噪声，并且提供更小尺寸的功率因数改善电路。

公开(公告)号：US09564819B2

公开(公告)日：2017-02-07

申请号：US14669532

申请日：2015-03-26

Applicant: TDK Corporation

Inventor： YueQing Wang ,  Honglei Wang

IPC: H02M3/335 ,  H02M3/28

CPC classification number: H02M3/33546 ,  H02M3/285 ,  H02M3/33592 ,  Y02B70/1475

Abstract: A switching power supply device includes: a transformer; a first switch connected between a high potential terminal of an input DC voltage source and a primary winding; a second switch connected between a low potential terminal of the input DC voltage source and a primary winding; a control circuit outputting a driving pulse signal for synchronizing the first and second switches; first and second rectifying devices; a synchronous rectifier circuit; and a positive bias circuit that applies a positive bias to a control terminal of one of the first and second switches so as to constantly turn the one of the first and second switches ON. When the first and second switches stop a switching operation while an output voltage exists between the output terminals, the positive bias circuit applies the positive bias to the one of the first and second switches.

Abstract translation: 一种开关电源装置，包括：变压器; 连接在输入DC电压源的高电位端子与初级绕组之间的第一开关; 连接在所述输入DC电压源的低电位端子与初级绕组之间的第二开关; 输出用于使所述第一和第二开关同步的驱动脉冲信号的控制电路; 第一和第二整流装置; 同步整流电路; 以及正偏置电路，其将第一和第二开关之一的控制端施加正偏置，以使第一和第二开关中的一个接通。 当第一和第二开关在输出端子之间存在输出电压时停止开关操作时，正偏置电路将正偏压施加到第一和第二开关中的一个。

公开(公告)号：US09490717B2

公开(公告)日：2016-11-08

申请号：US14669581

申请日：2015-03-26

Applicant: TDK Corporation

Inventor： YueQing Wang ,  Honglei Wang

IPC: H02M3/335 ,  H02M3/28

CPC classification number: H02M3/33546 ,  H02M3/285 ,  H02M3/335 ,  H02M3/33592 ,  Y02B70/1475

Abstract: A switching power supply device includes: a main transformer; a main switch that is connected between a high potential terminal of an input direct current voltage source and a primary-side main winding; a synchronous rectifier circuit includes: a rectifying switch that is connected to a secondary-side main winding in series and that is turned ON in synchronization with a turning ON state of the main switch and a commutation switch that is connected to the rectifying switch series circuit in parallel and that is turned ON in synchronization with a turning OFF state of the main switch; and an auxiliary switch circuit that turns the commutation switch OFF. When the main switch stops a switching operation while a voltage exists at a first output terminal on a high potential side, the auxiliary switch circuit turns the commutation switch OFF to prevent continuation of self-excited oscillation.

Abstract translation: 一种开关电源装置，包括：主变压器; 连接在输入直流电压源的高电位端子与初级侧主绕组之间的主开关; 同步整流电路包括：整流开关，其与次级侧主绕组串联连接，并且与主开关的导通状态同步地接通;以及换向开关，其连接到整流开关串联电路 与主开关的断开状态同步地接通; 以及使换向开关断开的辅助开关电路。 当主开关在高电位侧的第一输出端存在电压时停止开关动作，辅助开关电路将换向开关切断，防止自激振荡的继续。

公开(公告)号：US09438124B2

公开(公告)日：2016-09-06

申请号：US14269258

申请日：2014-05-05

Applicant: TDK Corporation

Inventor： YueQing Wang ,  Honglei Wang

IPC: H02M3/335

CPC classification number: H02M3/33561 ,  H02M3/33507

Abstract: A power supply circuit includes a plurality of output terminals that output voltages (voltages may have the same or different voltage values among the output terminals), and a transformer that has a plurality of output windings. First and second output windings of the plurality of output windings are coupled to each other. The first and second output windings have the same number of turns. First terminals, which have a first polarity, of the first and second output windings are connected to each other via a capacitor. Further, second terminals, which have a second polarity opposite to the first polarity, of the first and second output windings are electrically connected to each other. The second terminals of the first and second output windings may be directly connected to each other.

Abstract translation: 电源电路包括输出电压（电压可以在输出端子中具有相同或不同的电压值）的多个输出端子和具有多个输出绕组的变压器。 多个输出绕组的第一和第二输出绕组彼此耦合。 第一和第二输出绕组具有相同的匝数。 第一和第二输出绕组具有第一极性的第一端子经由电容器相互连接。 此外，第一和第二输出绕组具有与第一极性相反的第二极性的第二端子彼此电连接。 第一和第二输出绕组的第二端子可以彼此直接连接。