Program-controlled thermistor simulator and resistance simulation method

Abstract

The invention discloses a program-controlled thermistor simulator and a resistance simulation method. The program-controlled thermistor simulator comprises an AD conversion circuit, a digital potentiometer combination, a microprocessor connection circuit and a user instrument connection circuit, wherein the microprocessor connection circuit is a socket connected to a microprocessor and enables the digital potentiometer combination and an AD conversion chip to be connected into the microprocessor for communication, and the microprocessor connection circuit connects the input ends of a first transistor driving relay, a second transistor driving relay, a third transistor driving relay and a fourth transistor driving relay to the serial port of the microprocessor to realize channel on-off control. According to the invention, a method of multi-stage serial digital potentiometers is adopted, so that large-range high-precision tissue simulation is realized; and the AD conversion circuit is used for automatically calibrating the digital potentiometer combination in real time, so that the problems that the precision of the digital potentiometer is not high and each temperature value needs to be calibrated are solved.

Description

technical field [0001] The invention relates to the field of simulating resistors, and more specifically, relates to a program-controlled thermistor simulator and a resistance simulating method. Background technique [0002] At this stage, the control of the internal working temperature of the user's instrument is often realized through a temperature control mechanism. The temperature control system usually consists of a temperature measurement circuit composed of a thermistor, a temperature control circuit composed of a heating plate, and a control system. The design of the temperature control system makes it have the characteristics of real-time monitoring and control of the internal working temperature of the user's instrument, fast response speed of temperature control and high temperature control accuracy. In order to test the characteristics of the temperature control system in the temperature control process of the user's instrument, it is necessary to simulate the th...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems in the existing temperature control system, such as the long period of the resistance value of the precision resistance network required to be calibrated, the unsafe and complicated circuit of the user's instrument circuit, and a program-controlled thermistor simulator is proposed. The simulator is based on digital potentiometer, high precision, safe and reliable

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