Heating Line Temperature Control Circuit Using Square-Wave Logic
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Solution Overview
Problem
Existing temperature-control circuits for heaters, such as electrothermal furnaces and heating pads, are complex and increase manufacturing costs due to the need for intricate detection and calculation circuits to maintain preset temperature ranges.
Innovation Solution
A temperature-control circuit using a first forward square-wave signal, a reverse square-wave signal, and a second forward square-wave signal varied with temperature changes, input into an AND gate to control the heating line, simplifying the circuit structure and reducing manufacturing costs while allowing flexible temperature adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a time difference determinator circuit and controller are used to detect and calculate temperature changes, then temperature control function is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple control functions into a single controller that integrates the detection and calculation capabilities. Instead of separate time difference determinator circuit and controller, one controller performs both functions by processing signals from the sensing line and implementing the temperature control algorithm, thereby reducing device complexity while maintaining temperature control reliability
Solution Approach 2:
The sensing line itself serves dual purposes: it is both the heating element and the temperature sensor. By utilizing the resistance change of the sensing line for both heating and temperature detection, the system eliminates the need for separate detection circuits, reducing overall system complexity and manufacturing cost while maintaining effective temperature control
2Measurement precision
If PTC or NTC elements are used for temperature detection, then temperature sensing is achieved, but circuit complexity increases
Solution Approach 1:
The sensing line is designed to serve multiple functions simultaneously: it acts as both the heating element and the temperature sensor. By using the same component for both heating and temperature detection, the system eliminates the need for separate PTC or NTC detection elements and their associated complex detection circuits, thereby reducing device complexity while maintaining temperature measurement precision
Solution Approach 2:
The sensing line utilizes its own resistance change characteristics for temperature detection while simultaneously serving as the heating element. This self-service approach eliminates the need for external detection elements and complex detection circuits, reducing overall system complexity while maintaining accurate temperature sensing capabilities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively controls heating temperatures within preset ranges, simplifies the circuit structure, and reduces manufacturing costs, providing a flexible mechanism for users to adjust heating temperatures.
Implementation Method 1
a second forward square-wave signal varied with temperature changes
Implementation Method 2
a heating line to increase or decrease temperature
Data Source
AI summary
A temperature-control circuit of a heating line and a temperature-control method thereof are disclosed. The method comprises steps of: outputting a forward square-wave signal by a first forward square-wave signal generation circuit; outputting a reverse square-wave signal by a reverse square-wave signal generation circuit; and outputting a varied forward square-wave signal by a second forward square-wave signal generation circuit. Above square-wave signal generation circuits are respectively connected with an AND gate. When the input square-wave signals are simultaneously logic high, a switch is triggered by a trigger circuit to heat the heating wire. When the heating wire's temperature increases, the forward square-wave signal output by the second forward square-wave signal generation circuit is changed so as to render these input square-wave signals non-simultaneously logic high and not to trigger the switch in order to stop the heating wire's heating and keep the heating wire at a certain temperature range.