Pump and pump control circuit apparatus and method
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United States of America Patent
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Nov 27, 2012
Grant Date -
Jul 31, 2008
app pub date -
Oct 31, 2007
filing date -
Nov 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Embodiments of the invention provide a pump control circuit for use with a pump. The circuit includes a pressure sensor capable of sensing a pressure in the pump and a microcontroller coupled to the pressure sensor and to the pump. The microcontroller switches operation of the pump between a high-flow mode and a low-flow mode. When in the high flow mode, the microcontroller limits a current provided to the pump to a high-flow current limit value that is not dependent on the sensed pressure. When in the low flow mode, the microcontroller limits the current provided to the pump to a low-flow current limit value that is less than the high-flow current limit value and that changes depending on the sensed pressure.
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