公开(公告)号：US08653823B2

公开(公告)日：2014-02-18

申请号：US13152360

申请日：2011-06-03

申请人： Kalyan P. Gokhale ,  Douglas W. Karraker ,  Ilkka T. Pajari ,  Matti T. Jussila

发明人： Kalyan P. Gokhale ,  Douglas W. Karraker ,  Ilkka T. Pajari ,  Matti T. Jussila

IPC分类号： G01R31/08

CPC分类号： H02M1/32

摘要： A system for the detection of welded contacts in a circuit of a line converter system has a plurality of inverter switches, a plurality of utility switches in which a pair of utility switches is connected in series through a line to a utility, a voltage detector, an electronic controller, and a DC input source. The line converter system converts incoming DC power into AC output power that is delivered to the utility grid. The voltage detector measures the voltage across a first node and a second node of the circuit and provides an output that is interpreted by an electronic controller for each step performed during a method of detection of welded contacts. The detection method has a sequence of test steps in which at least one switch is opened and/or closed, a DC bus of the inverter or the utility grid is used as a stimulus voltage, and the voltage is measured. If a voltage is not detected across the first and second nodes, the test sequence is continued until a welded contact is detected or the electronic controller determines that none of the contacts are welded. If the controller determines that none of the contacts are welded, the line converter system is permitted to connect and supply AC power to the utility.

摘要翻译： 用于检测线路转换器系统的电路中的焊接触点的系统具有多个逆变器开关，多个效用开关，其中一对效用开关通过线路串联连接到公用设施，电压检测器， 电子控制器和DC输入源。 线路转换器系统将输入的直流电力转换成交付输出功率，并输送到公用电网。 电压检测器测量电路的第一节点和第二节点上的电压，并提供由电子控制器解释的输出，用于在焊接触点的检测方法期间执行的每个步骤。 检测方法具有一系列测试步骤，其中至少一个开关被打开和/或关闭，逆变器或公用电网的DC总线用作激励电压，并且测量电压。 如果在第一和第二节点之间没有检测到电压，则继续测试序列直到检测到焊接接触点，或者电子控制器确定没有焊接接触点。 如果控制器确定没有一个触点被焊接，则允许线路转换器系统连接并向公用设施提供AC电力。