Back to results
US 8,796,879 B2Granted
Two-wire power and communications for irrigation systems
AssigneeThe Toro Company
InventorsAlex Korol, Eduardo Fregoso
Life of this patent
Estimating the term…
Abstract
A two-wire power and communication system is provided, having a decoder that draws a constant amount of current for communication signals despite changes in the voltage on the power and communication wires. In one example, decoders have a constant current sink circuit that includes a shunt regulator that controls a field effect transistor.
Claims18
An irrigation system decoder comprising:
- decoder circuitry that receives power and communication signals over a wire pair from an irrigation interface that manipulates a potential across said wire pair;
- said decoder circuitry controlling operation of a connected irrigation valve;
- and
- said decoder circuitry drawing a predetermined current on said wire pair independently of a voltage on said wire pair.
1 more element
An irrigation control system decoder comprising:
- decoder circuitry that receives power and communication signals over a wire pair from an irrigation interface that manipulates a potential across said wire pair;
- said decoder circuitry controlling operation of one or more connected irrigation valves;
- and,
- a plurality of surge circuits providing an electrical path in which electrical surges selectively bypassing said decoder circuitry;
- wherein said plurality of surge circuits comprise a first surge circuit connected at a first location between said wire pair and said decoder circuitry, and a second location between said decoder circuitry and said irrigation valves.
2 more elements
An irrigation system decoder comprising:
- decoder circuitry that receives power and communication signals over a wire pair from an irrigation interface that manipulates a potential across said wire pair;
- and;
- a plurality of surge circuits providing an electrical path in which electrical surges selectively bypassing said decoder circuitry;
- wherein said decoder circuitry controlling operation of a connected irrigation valve;
- and,
- wherein said decoder circuitry drawing a predetermined current on said wire pair independently of a voltage on said wire pair.
3 more elements
Dependencies are inferred from the claim text.