发明名称 |
Contactor health monitor circuit and method |
摘要 |
In one possible implementation, a method is provided for determining contactor health including measuring a differential voltage between a first utility line voltage and a second utility line voltage on a primary side of a contactor and on a secondary side of the contactor. The measuring is performed with both an unloaded current and with a load current. The unloaded and loaded measurements are performed at the primary side and the secondary side, and are made with the contactor closed. It includes determining a difference between a secondary unloaded voltage and a secondary loaded voltage and subtracting a difference between a primary unloaded voltage and a primary loaded voltage to provide a contactor voltage drop. The contactor resistance is determined by dividing the contactor voltage drop by the loaded current. |
申请公布号 |
US9267974(B2) |
申请公布日期 |
2016.02.23 |
申请号 |
US201213655144 |
申请日期 |
2012.10.18 |
申请人 |
AeroVironment, Inc. |
发明人 |
Flack Albert |
分类号 |
G01R27/08;G01R27/20;G01R31/04;H01R43/00 |
主分类号 |
G01R27/08 |
代理机构 |
|
代理人 |
Balzan Christopher R.;Aagaard Eric J. |
主权项 |
1. A method for determining contactor health, the method comprising:
a) measuring a differential voltage between a first utility line voltage and a second utility line voltage on a primary side of a contactor and on a secondary side of the contactor; b) wherein the measuring is performed with both an unloaded current and with a load current; c) wherein both the unloaded and loaded measurements at the primary side and the secondary side are made with the contactor closed; d) determining a difference between a secondary unloaded voltage and a secondary loaded voltage and subtracting a difference between a primary unloaded voltage and a primary loaded voltage to provide a contactor voltage drop; and e) determining the contactor resistance by dividing the contactor voltage drop by the loaded current. |
地址 |
Simi Valley CA US |