Detecting faults on a spur wired alarm circuit
AssigneeHoneywell International Inc.
InventorMichael Barson
Life of this patent
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Abstract
Devices, methods, and systems for detecting faults on a spur wired alarm circuit are described herein. One system includes a bipolar capacitor coupled to a last device on a spur wired alarm circuit, a voltage supply coupled to the spur wired alarm circuit, and a controller configured to operate the voltage supply such that a current flows through the spur wired alarm circuit, operate the voltage supply such that the current stops flowing through the spur wired alarm circuit for a particular amount of time, determine a voltage across the bipolar capacitor while the current has stopped flowing through the spur wired alarm circuit, and determine whether a fault has occurred on the spur wired alarm circuit based on the determined voltage.
Claims20
A system for detecting faults on a spur wired alarm circuit, comprising:
- a bipolar capacitor coupled to a last device on a spur wired alarm circuit;
- a voltage supply coupled to the spur wired alarm circuit;
- and
- a controller configured to:
- operate the voltage supply such that a current flows through the spur wired alarm circuit;
- operate the voltage supply such that the current stops flowing through the spur wired alarm circuit for a particular amount of time;
- determine a voltage across the bipolar capacitor while the current has stopped flowing through the spur wired alarm circuit;
- and
- determine whether a fault has occurred on the spur wired alarm circuit based on the determined voltage.
A method for detecting faults on a spur wired alarm circuit, comprising:
- operating a voltage supply such that a current flows through a spur wired alarm circuit having a bipolar capacitor coupled to a last device on the spur wired alarm circuit;
- operating the voltage supply such that the current stops flowing through the spur wired alarm circuit for a particular amount of time;
- determining a voltage across the bipolar capacitor while the current has stopped flowing through the spur wired alarm circuit;
- and
- determining whether a fault has occurred on the spur wired alarm circuit based on the determined voltage.
A system for detecting faults on a spur wired alarm circuit, comprising:
- a bipolar capacitor coupled to a last device on a spur wired alarm circuit;
- a transistor coupled to the spur wired alarm circuit;
- and
- a controller configured to:
- switch on the transistor such that a current flows through the spur wired alarm circuit;
- switch off the transistor such that the current stops flowing through the spur wired alarm circuit for a particular amount of time;
- determine a voltage across the transistor while the current has stopped flowing through the spur wired alarm circuit;
- determine a voltage across the bipolar capacitor while the current has stopped flowing through the spur wired alarm circuit based on the determined voltage across the transistor;
- and
- determine whether a fault has occurred on the spur wired alarm circuit based on the determined voltage across the bipolar capacitor.
Dependencies are inferred from the claim text.