Circuit and method for controlling current flow through a solenoid
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United States of America Patent
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Jul 24, 2007
Grant Date -
Jul 21, 2005
app pub date -
Jan 18, 2005
filing date -
Mar 1, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solenoid control circuit that includes two switching networks that are selectively opened and closed in a current limit cycle to control the magnitude of the current flowing through the solenoid. The configuration of the switching networks is such that current flows through an energy dissipating resistor only when the solenoid is commanded off by the solenoid control circuit, and not during the current limit cycle. Thus, the energy dissipated by this resistor is reduced relative to other solenoid control circuits, making it more efficient, and reducing EMI emissions from the circuit while providing for a fast solenoid response.
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