Temperature and current dependent regulated voltage source
First Claim
1. A voltage control circuit comprising:
- a voltage regulator controlling a first parameter;
a temperature sensor; and
a parameter sensor sensing a second parameter independent of the first parameter controlled by the voltage regulator;
said temperature sensor and said parameter sensor being connected to control the voltage regulator.
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Accused Products
Abstract
A linear voltage regulator is operated by a temperature sensor and a current sensor. The temperature sensor is a thermistor in a voltage divider connected across the output of the regulator. The current sensor operates a voltage follower connected to adjust the voltage in the voltage divider. The regulator controls voltage supplied to a cooling fan in a power supply. The sensed temperature is the air temperature near the power supply enclosure. The sensed current is the output current of the power supply. When the ambient temperature increases and/or the power supply output current increases, the voltage regulator increases the fan speed by raising the voltage. The current sensor can also be used to sense other parameters, such as voltage.
51 Citations
37 Claims
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1. A voltage control circuit comprising:
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a voltage regulator controlling a first parameter; a temperature sensor; and a parameter sensor sensing a second parameter independent of the first parameter controlled by the voltage regulator; said temperature sensor and said parameter sensor being connected to control the voltage regulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 33, 34, 35)
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24. A voltage controller comprising:
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a linear voltage regulator having an input connection, an output connection, and an adjust connection; a voltage divider having a first leg connected between the output connection and the adjust connection and a second leg connected between the adjust connection and ground, said voltage divider defining a central node connected to the adjust connection; a thermistor connected in a leg of the voltage divider so as to vary a voltage at the adjust connection proportionally with a temperature sensed by the thermistor; a voltage follower connected at a leg of the voltage divider; a current sensor adapted for varying an output voltage of the voltage follower so as to vary the voltage at the adjust connection proportionally with a sensed current; and a direct current input voltage connected between the input connection and ground. - View Dependent Claims (25)
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26. A power supply comprising:
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an enclosure; a power source disposed in the enclosure and adapted for providing a variable output current to a load; a fan adapted for conveying cooling air through the enclosure; and a voltage control circuit connected to control the fan, said voltage control circuit comprising; a voltage regulator controlling a first parameter; a temperature sensor adapted for sensing temperature at the enclosure; and a parameter sensor for sensing a second parameter of the power source independent of the first parameter controlled by the voltage regulator; said temperature sensor and said parameter sensor being connected to control the voltage regulator. - View Dependent Claims (27, 28, 29, 30, 31, 32, 36)
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37. A power supply comprising:
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an enclosure; a power source disposed in the enclosure and adapted for providing a variable output current to a load; a fan adapted for conveying cooling air through the enclosure; a linear voltage regulator having an input connection, an output connection, and an adjust connection; a voltage divider having a first leg connected between the output connection and the adjust connection and a second leg connected between the adjust connection and ground, said voltage divider defining a central node connected to the adjust connection; a thermistor disposed at the enclosure, adapted for sensing temperature at the enclosure, and connected in the first leg of the voltage divider for varying a voltage at the adjust connection proportionally with the sensed temperature; a voltage follower connected at the second leg of the voltage divider; a current sensor connected for varying an output voltage of the voltage follower so as to vary the voltage at the adjust connection proportionally with the output current to the load; and a direct current voltage connected between the input and ground.
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Specification