Heat source temperature measurement device and method for electrical heating

Abstract

The invention discloses a heat source temperature measurement device for electrical heating. The device comprises a load voltage sampling module, a load current sampling module, a zero crossing trigger synchronous module and a microprocessor, the microprocessor records the current signal sent by the load current sampling module and the voltage signal sent by the load voltage sampling module afterreceiving the zero crossing synchronization signal of the zero crossing trigger synchronous module, the resistance value of a heat source can be calculated as per a formula of R=V / I, and the heat source temperature value can be obtained per the relation curve of the resistance value and the temperature value of heat source material. The invention has the benefits that by virtue of the property that the internal resistance of the heat source can be changed along with the temperature variation during heating process, the heat source temperature can be measured indirectly by measuring the variation of the internal resistance, in this way, the voltage and the current, which pass the heat source, can be measured real-timely during the heating process, and the resistance value of the heat source can be calculated as per the formula of R=V / I, thereby determining the temperature of the heat source for electrical heating accurately.

Description

technical field [0001] The invention relates to the field of electric heating, in particular to an electric heating heat source temperature measuring device and method. Background technique [0002] The current heating, temperature measurement, and temperature adjustment control technology of electric heating products generally use temperature sensors to measure temperature, and the intelligent system adjusts the driven load output power to control the temperature according to the temperature measurement signal. [0003] The patent application document of China Invention Patent Application No. 95103937.7 discloses a temperature measurement system composed of 1 to 16 temperature sensors, analog switches, data amplifiers, analog-to-digital converters and computers, using microwave sources and temperature measurement circuits intermittently The colloid is heated and temperature measured, that is, t+Δt is a heating and temperature measurement cycle, the microwave source heats up...

AI Technical Summary

Problems solved by technology

[0004] Obviously, the temperature measurement circuit and temperature measurement method above are to put the temperature sensor into the measured medium to sense the temperature, and after a series of processes such as signal sampling, analog conversion, and signal processing, the measurement accuracy is affected by the sensor's own accuracy, signal Influenced by sampling accuracy, analog conversion accuracy, and post-signal processing, the inconsistent measurement accuracy of multiple links leads to inaccurate measurement

In addition, the response speed of the sensor is also another reason for the temperature measurement results to be affected.

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