Temperature change speed detection loop

Abstract

The invention provides a temperature change speed detection loop. The temperature change speed detection loop comprises a thermistor, a differential sampling circuit, a constant current output circuit, a subtraction circuit, a reverse circuit, a summing circuit, a differentiating circuit, a heating speed comparison circuit, a cooling speed comparison circuit, a heating speed weighted temperature comparison circuit and a cooling speed weighted temperature comparison circuit. The temperature signal is converted into the temperature change signal, then the amplitude of the temperature change signal is compared and judged, and when the temperature change speed is too high, an alarm signal can be sent out in time. Besides, an over-temperature detection circuit in which a temperature signal participates is additionally arranged, that is, when the temperature value is relatively high and the temperature rise speed is relatively high, an alarm signal is sent out in time; and an under-temperature detection circuit in which a temperature signal participates is arranged, that is, when the temperature value is relatively low and the temperature drop speed is relatively high, an alarm signal is sent out in time. The circuit adopts pure hardware design, does not need software cooperation, and has the characteristic of high response speed.

Description

technical field [0001] The invention relates to the technical field of temperature detection, in particular to a temperature change speed detection loop. Background technique [0002] In more important systems, in order to ensure reliability and avoid failure of key components due to exceeding the tolerance temperature range, thermistors are generally used to monitor the temperature value of key components. When the temperature value reaches a certain set value, the output temperature exceeds Signal to set the threshold. The system with higher requirements will use the software to record the historical temperature value and calculate the temperature change speed. When the calculated value exceeds the set value, it will report a signal that the temperature change speed is too fast. The above software calculates the temperature change speed, the delay in calculating the temperature rise speed is relatively large, and the delay may reach the ms level or the second level. Incr...

AI Technical Summary

Problems solved by technology

The method of calculating the temperature change rate by the above software has a large delay in calculating the temperature rise rate, and the delay may reach the ms or second level. When the temperature change rate is fast, it will cause the risk of failure of key components beyond the tolerance temperature range Increase

At the same time, the method of calculating the temperature change rate by software requires the coordination of software and hardware design, which is highly complex.

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