NTC thermistor simulator

Abstract

The present invention provides an NTC thermistor simulator. The NTC thermistor simulator is characterized in that the NTC thermistor simulator comprises a key and coding switch, a main control MCU, adisplay, a control logic, a communication interface and a resistance network; the main control MCU is connected with and drives the resistance network through control logic, and the resistance networkis controlled by the main control MCU to adjust the resistance value of external output of the main control MCU; the communication interface is connected with the main control MCU and is used for updating the main control MCU or downloading a temperature-resistance value comparison table; and the display displays the current output resistance value and the temperature value corresponding to the resistance value. According to the invention, the adjustment value is flexible, one person can operate with one hand, and the disconnection time during gear shifting is at a microsecond level, so thatthe occurrence of false triggering caused by wrong data received in the debugging process of equipment with high sampling speed is avoided; two modes of adjusting the resistance value or adjusting thetemperature value can be switched, a temperature-resistance meter can be imported from a PC, and the resistance value or the temperature does not need to be specially memorized.

Description

technical field [0001] The invention relates to an NTC thermistor simulator. Background technique [0002] It is inevitable to encounter a difficult problem in the development or debugging of products or equipment with NTC thermistors, that is, it is necessary to use a resistance box to adjust the resistance to simulate the resistance of NTC at a certain temperature point. The traditional technical means is to adjust the resistance value by manually operating the resistance, and because the resistance value of the NTC will change with the change of the temperature, it is necessary for the technician to adjust the resistance box by facing the thermometer during adjustment. We know that NTC is difficult to operate when the order of magnitude jumps. For example, to adjust the resistance of NTC from 100k to 99k, two people and three hands are needed to operate. One person adjusts the 100k level from 1 to 0, and the other person needs The 10k file and the 1k file are adjusted fr...

AI Technical Summary

Problems solved by technology

We know that NTC is difficult to operate when the order of magnitude jumps. For example, to adjust the NTC resistance from 100k to 99k, two people and three hands are needed to operate. One person adjusts the 100k level from 1 to 0, and the other person needs to 10k files and 1k files are adjusted from 0 to 9

If the sampling speed of the equipment or product is very high, it will receive wrong data and cause false triggering, and the structure of the existing resistance box is a band switch, there may be an open circuit time during the switching process, and false triggering will also occur

In addition, NTC is a nonlinear device, and it is difficult to remember the corresponding relationship between its temperature and resistance value, so it is necessary to have a temperature-resistance value table for comparison, but the resistance value of each manufacturer will vary a little, making it very inconvenient to adjust

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