| US 7,595,567 B1 | ||
| Thermostat device with line under frequency detection and load shedding capability | ||
| Joel R. Cannon, Minneapolis, Minn. (US); William R. Ockert, Cathay, N. Dak. (US); Robert Cox, Carrington, N. Dak. (US); and Kevin Allmaras, Carrington, N. Dak. (US) | ||
| Assigned to Cannon Technologies/Cooper Power, Minneapolis, Minn. (US) | ||
| Filed on Jun. 08, 2007, as Appl. No. 11/811,144. | ||
| Application 11/811144 is a division of application No. 10/824825, filed on Apr. 15, 2004, granted, now 7,242,114. | ||
| Claims priority of provisional application 60/485435, filed on Jul. 08, 2003. | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H02J 3/14 (2006.01) | ||
| U.S. Cl. 307—29 | 6 Claims |
| 1. An under frequency protection thermostat-type device comprising:
a thermostat-type housing;
a transformer adapted to be electrically connected to a primary voltage source having a predefined frequency level and disposed
within said housing;
a line under frequency (LUF) detection and measurement module electrically connected to the transformer and adapted to detect
a line under frequency condition from a signal received from the transformer;
a microcontroller connected to the LUF detection and measurement module and 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, wherein the
measured frequency is compared to a predefined frequency threshold; and
a load switch connected to the microcontroller adapted to respond to a command from the microcontroller to disengage and engage
an electrical load from the voltage source.
|