Thermostat device with line under frequency detection and load shedding capability
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United States of America Patent
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Sep 29, 2009
Grant Date -
N/A
app pub date -
Jun 8, 2007
filing date -
Jul 8, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An under frequency protection thermostat-type device includes a thermostat-type housing, a transformer, a line under frequency (LUF) detection and measurement module, a microcontroller, and a load switch. The transformer is adapted to be electrically connected to a primary voltage source having a predefined frequency level and disposed within the housing. The LUF detection and measurement module is electrically connected to the transformer and adapted to detect a line under frequency condition from a signal received from the transformer. The microcontroller is connected to the LUF detection and measurement module and is adapted to send a command to disengage and engage an electrical load as a function of a measured frequency of the voltage source over a predefined period of time. The measured frequency is compared to a predefined frequency threshold. The load switch is connected to the microcontroller and is adapted to respond to a command from the microcontroller to disengage and engage an electrical load from the voltage source.
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