WETTING CURRENT DIAGNOSTICS
First Claim
1. A method of providing wetting current diagnostics for a load control switch, the method comprising:
- detecting a state of the load control switch;
measuring a current level of a wetting current;
when the detected state is an open state, determining, based on the measured current level, whether the state of the load control switch is detected correctly; and
when the detected state is a closed state, comparing the measured current level to a closed switch current threshold.
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Accused Products
Abstract
A circuit for diagnostic testing includes a current source coupled to a power source and configured to provide wetting current along a path to a load control switch, a current sensor connected in series with the current source along the path, the current sensor being configured to generate a current sensor signal indicative of a current level along the path, a voltage measurement unit having an input terminal coupled to a node along the path through which the wetting current flows to reach the load control switch, the voltage measurement unit being configured to detect a state of the load control switch based on a voltage at the node, and a controller coupled to the current sensor and the voltage measurement unit, the controller being configured to determine a wetting current diagnostic condition in accordance with the current level and the detected state.
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Citations
20 Claims
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1. A method of providing wetting current diagnostics for a load control switch, the method comprising:
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detecting a state of the load control switch; measuring a current level of a wetting current; when the detected state is an open state, determining, based on the measured current level, whether the state of the load control switch is detected correctly; and when the detected state is a closed state, comparing the measured current level to a closed switch current threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of providing wetting current diagnostics for a load control switch, the method comprising:
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providing, by a current source coupled to a power source, a wetting current along a path to the load control switch; generating, by a current sensor connected in series with the current source along the path, a current sensor signal indicative of a current level along the path; detecting, by a voltage measurement unit having an input terminal coupled to a node along the path through which the wetting current flows to reach the load control switch, a state of the load control switch based on a voltage at the node; and determining, by a controller coupled to the current sensor and the voltage measurement unit, a wetting current diagnostic condition in accordance with the current level and the detected state of the load control switch. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method of providing wetting current diagnostics for a load control switch, the method comprising:
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providing, by a current source coupled to a power source, a wetting current along a path to the load control switch; generating, by a current sensor connected in series with the current source along the path, a current sensor signal indicative of a current level along the path; receiving, by a current measurement unit coupled to the current sensor, the current sensor signal; comparing, by the current measurement unit, the current level with an open switch threshold and a closed switch threshold; detecting, by a voltage measurement unit having an input terminal coupled to a node along the path through which the wetting current flows to reach the load control switch, a state of the load control switch based on a voltage at the node; and determining, by a controller connected to the current measurement unit and the voltage measurement unit, a wetting current diagnostic condition in accordance with the comparisons and the detected state. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification