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US 2006/0214810 A1Published application
Diagnostic circuit
AssigneeRobertshaw Controls Company
InventorRobert Alvord
Life of this patent
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AssigneeRobertshaw Controls Company
InventorRobert Alvord
Estimating the term…
A diagnostic circuit is provided. The diagnostic circuit comprises resistors and a capacitor. The diagnostic circuit is monitored to detect the presence of a load and to confirm the proper operation of a relay circuit. The diagnostic circuit generates an oscillating voltage when the relay circuit is open and the load is connected, generates a logic low when the relay circuit is open and the load is disconnected, and generates a logic high when the relay circuit is closed. The diagnostic circuit can be disposed within a diagnostic circuit system that includes one or more of a sensing circuit, a relay circuit, an alternating-current source having a direct current offset, an input circuit, and a high-voltage microprocessor. The high-voltage microprocessor can be bi-directionally optically coupled to an application microprocessor.
A floating diagnostic circuit coupled to a load node between a relay circuit and a load, comprising:
A diagnostic circuit system for determining the proper operation of a relay circuit and the status of a connection of a load thereto, comprising:
A diagnostic circuit system, comprising:
Dependencies are inferred from the claim text.