Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2008-05-13
2008-05-13
Hoang, Tu Ba (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S494000, C392S457000, C392S338000, C392S441000, C204S196060, C324S439000
Reexamination Certificate
active
07372005
ABSTRACT:
A water heater having a powered electrode and a method of controlling the water heater. The water heater includes a tank to hold water, a heating element, an electrode, and a control circuit. The control circuit includes a variable voltage supply, a voltage sensor, and a current sensor. The control circuit is configured to controllably apply a voltage to the electrode, determine the potential of the electrode relative to the tank with the voltage sensor when the voltage does not power the electrode, determine a current applied to the tank after the voltage powers the electrode, determine a conductivity state of the water in the tank based on the electrode potential and the current, and define the voltage applied to the powered electrode based on the conductivity state. The control circuit of the water heater can also determine whether the water heater is in a dry-fire state.
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Knoeppel Ray Oliver
Murphy Mark Allan
Van Sistine Thomas Gerard
AOS Holding Company
Hoang Tu Ba
Michael & Best & Friedrich LLP
Ralis Stephen J.
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