Invention Grant
US07948257B2 Method and apparatus for testing and protecting digital output circuits
有权
用于测试和保护数字输出电路的方法和装置
- Patent Title: Method and apparatus for testing and protecting digital output circuits
- Patent Title (中): 用于测试和保护数字输出电路的方法和装置
-
Application No.: US12393431Application Date: 2009-02-26
-
Publication No.: US07948257B2Publication Date: 2011-05-24
- Inventor: Thomas Bruce Meagher , Gerald Robert Creech , Robert Sidney Ord
- Applicant: Thomas Bruce Meagher , Gerald Robert Creech , Robert Sidney Ord
- Applicant Address: US OH Mayfield Heights
- Assignee: Rockwell Automation Technologies, Inc.
- Current Assignee: Rockwell Automation Technologies, Inc.
- Current Assignee Address: US OH Mayfield Heights
- Agency: Boyle Fredrickson LLP
- Agent William R. Walbrun; John M. Miller
- Priority: EP08165293 20080926
- Main IPC: G01R31/26
- IPC: G01R31/26
Abstract:
A method and system for testing and protecting the operability of an output module. An output channel includes a transistor having a gate, a source, and a drain. The output channel drives a load with a load voltage and a load current in dependence upon a gate drive signal applied to the gate. The system determines a voltage threshold and a current threshold and monotonically varies the gate drive signal from a starting value for a predetermined time interval while monitoring the load current and the load voltage. The system returns the gate drive signal to the starting value if any of the load voltage reaches the voltage threshold, the load current reaches the current threshold, or a predetermined time interval expires indicating the condition of the output module.
Public/Granted literature
- US20090219049A1 Method and Apparatus for Testing and Protecting Digital Output Circuits Public/Granted day:2009-09-03
Information query
