Ice bank control with voltage protection sensing
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United States of America Patent
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Apr 23, 2002
Grant Date -
N/A
app pub date -
Apr 16, 2001
filing date -
Aug 12, 1999
priority date (Note) -
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Abstract
The present invention is an apparatus and method that regulates the size of an ice bank (50) and that prevents short cycling of the compressor (30) therefor and operation thereof at undesired voltages. A microprocessor based control circuit (10) includes a circuit for sensing line voltage (14) combined with an ice bank sensing circuit (18, 20). The ice bank sensing circuit is of the conductivity sensing type wherein the electrical conductivity between two probes (P1, P2) is sensed. The microprocessor (16) continually monitors the probes (P1, P2) to determine if refrigeration is needed or not, and continually senses the line voltage to determine if that voltage is within the design limits of the refrigeration compressor (30). The voltage sensing circuit (14) can also sense if power has been interrupted where the voltage drops to zero.
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