A wide temperature control circuit, a main board and a method for controlling the wide temperature of the main board

Abstract

The invention is applicable to the field of mainboard circuits, and provides a wide temperature range control circuit and mainboard, and a method for controlling wide temperature range of the mainboard. The wide temperature range control circuit comprises a temperature compensation primary module, a fine adjustment module and a filter module. In the invention, when the temperature change results in emitter junction saturated on-state voltage change of the transistor, a thermistor RT1 in the temperature compensation primary module regulates the base voltage of the transistor to have a compensation effect on the emitter junction saturated on-state voltage change of the transistor, thereby avoiding the phenomenon of temperature drift of the transistor under wide temperature range conditions, so that the mainboard circuit can operate normally and stably.

Description

technical field [0001] The invention belongs to the field of mainboard circuits, and in particular relates to a wide temperature control circuit, a mainboard and a method for controlling wide temperature of the mainboard. Background technique [0002] Ordinary computer motherboards only need to be able to work normally under normal temperature conditions (0°C to 40°C). In the field of special computers, due to the harsh requirements of harsh environments, it is often required that the motherboard can operate normally and stably under a wide temperature range. Such as -40°C to 85°C, which is far beyond normal temperature conditions. In this harsh environment of extreme cold and heat, electronic devices such as transistors on the main board will have a physical phenomenon of temperature drift, and the saturation conduction voltage of the emitter junction of the transistor changes with the temperature, thereby changing the characteristics of the circuit and causing the main boa...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a wide temperature control circuit, which aims to solve the problem of temperature drift of electronic devices caused by temperature drift in the prior art, which leads to the timing control circuit of the motherboard. Problems that cannot work normally, stably, and accurately

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