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Method for measuring and controlling temp of electrothermal body

A technology of electric heating elements and circuits, applied in temperature control, non-electric variable control, thermometers using electric/magnetic elements that are directly sensitive to heat, etc., can solve broken, low operating level, use safety and reliability discounts, etc. problem, to achieve the effect of simple production and molding process, solution to the problem of temperature measurement and control accuracy, and simplified wiring structure

Inactive Publication Date: 2003-02-12
冯季强
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AI Technical Summary

Problems solved by technology

Since these electric heating products are usually daily appliances that are frequently used, a large part of their users have the characteristics of old age, inconvenient movement, slow response, poor self-care ability, and low operating level. This requires that the product must be reliable in structure, durable, and economical. Toss, while overheating is strictly prohibited
At present, although the traditionally used temperature sensor is accurate in sensing temperature, it must be placed on the electric heating body away from the controller, which not only increases the complexity of the electric heating product structure, increases the cost, but is also prone to disconnection, short circuit, pressure loss, Breakage and other faults greatly reduce the safety and reliability of the product

Method used

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  • Method for measuring and controlling temp of electrothermal body
  • Method for measuring and controlling temp of electrothermal body
  • Method for measuring and controlling temp of electrothermal body

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Embodiment Construction

[0014] see Figure 1-Figure 4 , this embodiment is mainly composed of heating elements R L , main power supply switch K, CPU control circuit, precision power switch, measuring bridge circuit R 1 , R 2 , R 3 , R L , Amplifying circuit A and its peripheral resistors, analog-to-digital conversion circuit ADC, additional functional circuits such as remote control, display, alarm, keyboard and other circuits.

[0015] In the above circuit block diagram, the CPU control circuit sends instructions to the main power supply switch K to apply electric power to the heating element R L Both ends, so as to obtain the required heat energy. At regular intervals, turn off the main power supply switch K for a short time, turn on the precision power switch, and apply standard power to the heating element R L Both ends, and the electrical parameters reflecting the resistance of the heating element are obtained by measuring the bridge circuit, and sent to the CPU control circuit for samplin...

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Abstract

A method for measuring and cotnrolling the temp. of electrothermal body features that when the electric power is applied to an electrothermal element, a measuring pulse is intermittently applied to measuring the resistance value of the said electrothermal element. Under the control of CPU, the measured value is compared with the characteristic parameters of the said electrothermal element to find out its actual temp.

Description

technical field [0001] The invention relates to temperature measurement and temperature control of electric heating products. Background technique [0002] In electric heating products, electric conductors are mainly used, such as electric heating wire, electric heating film, carbon fiber, electric heating foil, electric heating powder, electric heating paint, etc., and heat is obtained by applying electric power. From the traditional metal material science and the modern quantitative electron energy band theory, we know that the resistance at both ends of a metal conductor is proportional to the temperature on the conductor. It is by utilizing this characteristic that various temperature sensors have been developed. Existing electric heating products, especially electric heating products for medical care, such as: electric blankets, electric heating mattresses, electric heating clothes, electric heating shoes, electric heating cushions, etc., generally apply electric power...

Claims

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Application Information

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IPC IPC(8): G01K7/24G05D23/20
Inventor 冯季强
Owner 冯季强
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