PWM controller for DC powered heating blanket
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United States of America Patent
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-
Aug 3, 2004
Grant Date -
Apr 22, 2004
app pub date -
Oct 22, 2002
filing date -
Oct 22, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A PWM-based controller for controlling a voltage applied to a DC-powered electric heating blanket from a power source includes a square wave producing circuit for connection in the circuit with the battery and the blanket. The square wave producing circuit produces a variable duty cycle square wave for controlling application of power to the blanket in accordance with the duty cycle of the square wave. The square wave producing circuit has a control input for varying the duty cycle of the square wave in response to a voltage at the control input. The voltage at the control input may be set manually using a voltage varying circuit connected to the power source. A low voltage detection circuit may also be connected to the power source and coupled to the control input of the square wave producing circuit for automatically producing a voltage that decreases the duty cycle of the square wave when the battery voltage decreases to or below a predetermined level.
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