公开(公告)号：US20160268797A1

公开(公告)日：2016-09-15

申请号：US14656049

申请日：2015-03-12

Applicant: Eaton Corporation

Inventor： Huaqiang Li ,  Youdong He ,  Xiaoling Li

IPC: H02H3/20 ,  H02M1/44 ,  H02M5/458

CPC classification number: H02M1/44 ,  H02H7/1252 ,  H02M1/32 ,  H02M1/36 ,  H02M5/458 ,  H02M5/4585 ,  H02M7/06 ,  H02M7/062 ,  H02M7/125 ,  H02M7/162

Abstract: A variable frequency drive (VFD) circuit includes an input connectable to an AC source, a rectifier to convert an AC power input to a DC power, a DC link to receive DC power from the rectifier and having a DC link voltage thereon, a DC link capacitor bank with one or more capacitors connected to the DC link, and a pre-charge circuit coupled to the DC link capacitor. The pre-charge circuit further includes one or more resistors, one or more pre-charge relays each operable in on and off states to selectively control a current flow through the resistor(s) so as to control an initial pre-charge of the DC link capacitor, and an overvoltage relay operable in on and off states to selectively cut-off a current flow to the DC link capacitor bank, so as to prevent an overvoltage condition in the DC link capacitor bank.

Abstract translation: 变频驱动（VFD）电路包括可连接到AC电源的输入端，将AC电源输入转换为DC电力的整流器，DC链路以从整流器接收DC电力并且具有DC链路电压; DC 链路电容器组与连接到DC链路的一个或多个电容器以及耦合到DC链路电容器的预充电电路。 预充电电路还包括一个或多个电阻器，一个或多个预充电继电器，每个可工作在导通和截止状态，以选择性地控制通过电阻器的电流，以便控制DC的初始预充电 连接电容器和可操作于导通和截止状态的过电压继电器，以选择性地截断到DC链路电容器组的电流，以便防止DC链路电容器组中的过电压状态。

公开(公告)号：US10355585B2

公开(公告)日：2019-07-16

申请号：US14656049

申请日：2015-03-12

Applicant: Eaton Corporation

Inventor： Huaqiang Li ,  Youdong He ,  Xiaoling Li

IPC: H02M1/32 ,  H02M5/458 ,  H02M1/44 ,  H02M1/36 ,  H02H7/125 ,  H02M7/06 ,  H02M7/12 ,  H02M7/162

Abstract: A variable frequency drive (VFD) circuit includes an input connectable to an AC source, a rectifier to convert an AC power input to a DC power, a DC link to receive DC power from the rectifier and having a DC link voltage thereon, a DC link capacitor bank with one or more capacitors connected to the DC link, and a pre-charge circuit coupled to the DC link capacitor. The pre-charge circuit further includes one or more resistors, one or more pre-charge relays each operable in on and off states to selectively control a current flow through the resistor(s) so as to control an initial pre-charge of the DC link capacitor, and an overvoltage relay operable in on and off states to selectively cut-off a current flow to the DC link capacitor bank, so as to prevent an overvoltage condition in the DC link capacitor bank.