Equipment temperature regulating circuit

Abstract

The invention discloses an equipment temperature regulating circuit which comprises a temperature detecting circuit, an integrating negative feedback circuit and a first heating control circuit. The temperature detecting circuit is used for detecting temperature of equipment, converting the detected temperature into voltage and outputting the voltage to an input end of the integrating negative feedback circuit from a voltage output end of the temperature detecting circuit. Reference voltage is accessed to the other input end of the integrating negative feedback circuit. Voltages at two input ends of the integrating negative feedback circuit are compared to each other, high-level or low-level control voltage is output from an output end of the integrating negative feedback circuit according to the comparison result and used for controlling heating of the first heating control circuit. The time for changing low level to high level of the control voltage and the time for changing the high level to the low level of the control voltage are longer than set time. The heating temperature point can be regulated by regulating the reference voltage, so that heating temperature points of the equipment having different temperature requirements can be regulated conveniently. In addition, since the process of changing the level of the control voltage is gradient, mutated current is avoided, and power supply ripple cannot be increased.

Description

technical field [0001] The invention relates to temperature regulation technology, in particular to a circuit for regulating temperature in equipment. Background technique [0002] The temperature regulation circuit in the device can ensure the normal and stable operation of the device within a certain temperature range. For some electronic equipment in extreme environments, such as avionics equipment at an altitude of more than 20,000 meters, low temperature and low pressure, it is usually necessary to have a temperature regulation circuit to keep the temperature in the electronic equipment within a certain range. Components can work normally. Especially for electronic equipment with strict temperature requirements of electronic components (such as LD lasers), it is more necessary to maintain a constant temperature state of the equipment. [0003] Currently widely used temperature regulation circuits such as figure 1 As shown; the bridge circuit is composed of resistors ...

AI Technical Summary

Problems solved by technology

That is to say, when changing the heating temperature point, it is necessary to adjust the resistance values ​​of the three resistors to reach a new balance point; this makes it inconvenient and cumbersome to adjust and change the heating temperature point of the temperature regulation circuit; if the temperature adjustment It is not convenient to adjust and change the heating tempera

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