Protection of polarity-sensitive components connected in parallel with a direct current motor or inductor
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United States of America Patent
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Apr 6, 2010
Grant Date -
Jul 2, 2009
app pub date -
Jan 2, 2008
filing date -
Jan 2, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Circuits and methods for protecting polarity-sensitive components, such as light emitting diodes, electrolytic capacitors or integrated circuits, operating from a DC current source including a DC motor, an inductor or relay having a positive terminal and a negative terminal for receiving current from the current source, a protection diode connected parallel with the positive and negative terminals of the motor in a reverse bias configuration, at least one polarity-sensitive component connected in parallel with the protection diode and the DC motor, and a polarity protection transistor connected either between the nominally positive current source terminal and the positive motor terminal, or between the nominally negative current source terminal and the negative motor terminal.
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