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AssigneeAnalog Devices International Unlimited Company
InventorsJonathan Ephraim David Hurwitz, Seyed Amir Ali Danesh, Iain Barnett
Estimating the term…
There is a need to monitor and control the state of relays and circuit breakers within power distribution systems. The monitoring of a relay state, i.e. open or closed, is often performed by applying a monitoring signal to sensing contacts added to the relay. Manufactures of such systems have chosen many different voltages for their own. monitoring systems making it difficult to interconnect dissimilar monitoring systems. A signal conditioning circuit is provided that can cope with a large input voltage range and can be configured to allow may items of equipment(which may be new item or legacy items) to be connected to a controller.
A signal conditioning circuit, the signal conditioning circuit comprising at least one input node connected to an input stage for processing an input signal received at the at least one input node, and an adjustable load to apply a load at the at least one input node.
A signal processing circuit as claimed in claim I further comprising a programmable filter.
A signal conditioning circuit as claimed in claim l in which the signal conditioning circuit comprises a plurality of signal processing paths connected to at least one input node, and the outputs of the signal processing paths are provided to a majority vote circuit.
A relay controller response to at least one input signal in order to change the state of a relay, wherein the controller has at least one of :
A signal processing circuit for use in a relay or circuit breaker monitoring and/or management system, the signal processing circuit comprising a programmable multichannel attenuator within an integrated circuit.
Dependencies are inferred from the claim text.