公开(公告)号：US09589718B2

公开(公告)日：2017-03-07

申请号：US13888743

申请日：2013-05-07

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Yuchen Yang ,  Daocheng Huang ,  Qiang Li ,  Fred C. Lee

IPC: G01R31/28 ,  H01F27/36 ,  H01F27/28

CPC classification number: H01F27/362 ,  H01F27/2804 ,  Y10T29/4902

Abstract: At least one shield member interposed between primary and secondary windings of a transformer and connected to the primary and/or secondary windings forms a distributed parasitic capacitance between the shield member and either the winding to which it is not connected or another shield member connected to that winding. Connections are made to the respective transformer windings such that the voltage distributions thus developed cause complementary common mode noise to be conducted in opposite directions in respective portions of the parasitic capacitance such that net common mode current can be made arbitrarily small without requiring that both sides of the distributed parasitic capacitance have complementary or equal voltage distributions. Such complementary common mode currents can be achieved by dividing opposing shield members or developing a voltage distribution in a single shield member in accordance with Faraday's Law.

Abstract translation: 插入在变压器的初级绕组和次级绕组之间并连接到初级和/或次级绕组的至少一个屏蔽构件在屏蔽构件与未连接的绕组之间形成分布的寄生电容，或者与未连接的绕组连接的另一个屏蔽构件 绕组。 连接到相应的变压器绕组，使得如此形成的电压分布导致互补共模噪声在寄生电容的各个部分中以相反的方向传导，使得净共模电流可以任意地小，而不需要两 分布式寄生电容具有互补或相等的电压分布。 这种互补共模电流可以通过根据法拉第定律划分相对的屏蔽构件或在单个屏蔽构件中显示电压分布来实现。

公开(公告)号：US20150289331A1

公开(公告)日：2015-10-08

申请号：US14628372

申请日：2015-02-23

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Xuebing Chen ,  Daocheng Huang ,  Qiang Li ,  Fred C. Lee

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0851

Abstract: Zero voltage switching (ZVS) is provided in switches of a switching circuit in a second stage of a power converter by an inductor of a CLL resonant circuit connected in parallel with both a primary winding of one or more transformers connected in series and an output of the switching circuit so that the parasitic output capacitances of the switches can be charged and discharged, respectively, during the dead-time of the switching circuit by current in the inductor and independently of current in the magnetizing inductance of the transformer. Therefore, the magnetizing inductance of the transformer can be made sufficiently large to balance currents delivered to respective loads that may be unbalanced as is particularly desirable for driving a plurality of LED strings for illumination and is consistent with controlled dimming of the LED strings. A current sensor such as a resistance can be place in any LED string and all transformer modules and string currents cross regulated,

Abstract translation: 通过与串联连接的一个或多个变压器的初级绕组并联连接的CLL谐振电路的电感器在功率转换器的第二级的开关电路的开关中提供零电压开关（ZVS），并且输出 开关电路，使开关的寄生输出电容分别在开关电路的死区时由电感器中的电流而分别进行充放电，而与变压器的励磁电感无关。 因此，可以使变压器的励磁电感足够大以平衡输送到各个负载的电流，这些电流可能是不平衡的，因为对于驱动多个用于照明的LED串特别理想，并且与LED串的受控调光一致。 电流传感器如电阻可以放置在任何LED串中，所有变压器模块和串电流交叉调节，

公开(公告)号：US20140334198A1

公开(公告)日：2014-11-13

申请号：US13888743

申请日：2013-05-07

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Yuchen Yang ,  Daocheng Huang ,  Qiang Li ,  Fred C. Lee

IPC: H01F27/36 ,  H01F41/02

CPC classification number: H01F27/362 ,  H01F27/2804 ,  Y10T29/4902

Abstract: At least one shield member interposed between primary and secondary windings of a transformer and connected to the primary and/or secondary windings forms a distributed parasitic capacitance between the shield member and either the winding to which it is not connected or another shield member connected to that winding. Connections are made to the respective transformer windings such that the voltage distributions thus developed cause complementary common mode noise to be conducted in opposite directions in respective portions of the parasitic capacitance such that net common mode current can be made arbitrarily small without requiring that both sides of the distributed parasitic capacitance have complementary or equal voltage distributions. Such complementary common mode currents can be achieved by dividing opposing shield members or developing a voltage distribution in a single shield member in accordance with Faraday's Law.

Abstract translation: 插入在变压器的初级绕组和次级绕组之间并连接到初级和/或次级绕组的至少一个屏蔽构件在屏蔽构件与未连接的绕组之间形成分布的寄生电容，或者与未连接的绕组连接的另一个屏蔽构件 绕组。 连接到相应的变压器绕组，使得如此形成的电压分布导致互补共模噪声在寄生电容的各个部分中以相反的方向传导，使得净共模电流可以任意地小，而不需要两 分布式寄生电容具有互补或相等的电压分布。 这种互补共模电流可以通过根据法拉第定律划分相对的屏蔽构件或在单个屏蔽构件中显示电压分布来实现。

公开(公告)号：US09544956B2

公开(公告)日：2017-01-10

申请号：US14628372

申请日：2015-02-23

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Xuebing Chen ,  Daocheng Huang ,  Qiang Li ,  Fred C. Lee

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0851

Abstract: In a two-stage power converter providing voltage regulation in a first stage, zero voltage switching (ZVS) is provided in switches in an unregulated, constant frequency second stage of a two-stage power converter by an inductor of a CLL resonant circuit connected in parallel with both a series connection of an external inductor and a primary winding of one or more transformers connected in series and an output of the switching circuit so that the output capacitances of the switches can be charged and discharged, respectively, by current in the parallel-connected inductor and independently of current in the magnetizing inductance of the transformer. Therefore, the magnetizing inductance of the transformer can be made sufficiently large to balance currents delivered to respective loads as is particularly desirable for driving a plurality of unbalanced LED strings independently of the value of the parallel-connected inductor which is desirably small.

Abstract translation: 在第一级提供电压调节的两级电力转换器中，通过CLL谐振电路的电感器连接在两级功率转换器的未调节恒定频率第二级的开关中提供零电压开关（ZVS） 与串联连接的一个或多个变压器的外部电感器和初级绕组的串联连接和开关电路的输出两者并联，使得开关的输出电容可以分别由并联的电流充电和放电 并且独立于变压器励磁电感中的电流。 因此，可以使变压器的磁化电感足够大以平衡输送到各个负载的电流，这是特别适合于驱动多个不平衡LED串，独立于期望较小的并联电感器的值。