Proportional temperature control system incorporating a linear delay
AssigneeHoneywell Inc.
InventorJohn L. Kabat
Life of this patent
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Abstract
A proportional temperature control system using a linear time delay circuit provides an output voltage that is similar to the output voltage of a thermostat but delayed in time. The delay circuit is a linear rate time delay system that compares a called for voltage shift at its input to the output voltage of an integrator circuit to provide a substantially linear rate of time delay. The comparator circuit and the integrator circuit are separated by a limiter so that regardless of the amount of the initial offset in voltage at the comparator, the rate of integration is always maintained the same.
Claims11
A linear rate time delay system, including:
- comparator means having input circuit means and output circuit means;
- voltage limiting means connected to said comparator output circuit means to receive an output voltage from said comparator means with said output voltage being limited in amplitude in both a positive and a negative sense with respect to a reference voltage;
- integrating amplifier means having an input connected to said voltage limiting means and further having output circuit means;
- said integrating amplifier means including capacitor means;
- and said integrating amplifier output circuit means connected to said comparator means input circuit means wherein said comparator means compares an input voltage with an integrating amplifier output voltage;
- said integrating amplifier output voltage being delayed with respect to time by said capacitor means whenever said input voltage of said comparator means changes an amount greater than a level set by said voltage limiting means.
A proportional temperature control system, including:
- thermostat means generating an output voltage proportional to an ambient temperature;
- comparator means having input circuit means and output circuit means with said input circuit means coupled to said thermostat means output voltage;
- voltage limiting means connected to said comparator output circuit means to receive an output voltage from said comparator means with said output voltage being limited in amplitude in both a positive and a negative sense with respect to a reference voltage;
- integrating amplifier means having an input connected to said voltage limiting means and further having output circuit means;
- said integrating amplifier means including capacitor means;
- and said integrating amplifier output circuit means connected to said comparator means input circuit means wherein said comparator means compares an input voltage with an integrating amplifier output voltage;
- said integrating amplifier output voltage being delayed with respect to time by said capacitor means whenever said input voltage of said comparator means changes an amount greater than a level set by said voltage limiting means to prevent said temperature control system from shifting at an undesirable rate.
Dependencies are inferred from the claim text.