Temperature sensor needless accurate heating-up temperature control device and method

A temperature sensor, heating temperature technology, applied in temperature control, temperature control by electric method, thermometer, etc., can solve the problems of low temperature control accuracy and repeatability, affecting the results of resistance measurement by bridge method, etc.

Active Publication Date: 2007-07-04
CAPITALBIO CORP +1
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  • Abstract
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Problems solved by technology

In such a structure, the uncertain contact resistance caused by the connection and the distributed resistance of the wire will affect the result of the bridge method resistance measurement
Therefore, the temperature control accuracy and repeatability of this device are not high.

Method used

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  • Temperature sensor needless accurate heating-up temperature control device and method
  • Temperature sensor needless accurate heating-up temperature control device and method

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Embodiment Construction

[0009] Fig. 1 is a schematic diagram of the system structure of the present invention. The controller (3) compares the detected actual temperature with the target temperature, and determines the actions of the heating switch (1) and the detection switch (2), so as to maintain the temperature of the heating element (6) within a certain accuracy range above and below the target temperature Inside. In the figure, the constant voltage source (7) provides heating energy for the heating element (6), and the precision constant current source (8) provides the heating element (6) with precise current for detection. A and D are two points with the farthest effective distance on the heating element (6), so that the heating element can be fully utilized. B is the position between A and D as close to A as possible, and C is the position between A and D as close to D as possible, so that the signal that can be detected between B and C is the largest. The result obtained by subtracting the...

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Abstract

A precise heating temperature control device and method without temperature sensor are disclosed that belongs to temperature measuring technique field, the characteristics are those: the controller obtains the practical temperature by measuring the resistance of the heating elements, when the practical temperature is lower than the target temperature, and the heating elements are pulse heated, and the practical temperature of heating elements are controlled at allowed extent. The invention does not need the additional temperature sensor and the resistance matched with the bridge, and it has simple structure, low cost, and accurate control temperature, and it can be used in any occasion that the temperature control is realized by resistance hater.

Description

technical field [0001] The invention relates to a precise heating temperature control device and method without a temperature sensor. Background technique [0002] In various fields such as biology, chemical industry, medicine, and home appliances, temperature control is a very common and important application. In traditional temperature control devices, when a certain temperature control accuracy needs to be achieved, a temperature sensor is used to measure the temperature of the heated part, and the closed-loop control of temperature is realized through the circuit structure. Traditional temperature sensors (including thermistors, thermocouples, analog silicon temperature sensors, and nickel / platinum resistance temperature detectors, etc.) require specialized measurement circuits for processing. And when the temperature sensor cannot be used in the part that needs temperature control due to certain limitations (such as size, distance, electric field, etc.), closed-loop he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/19G05D23/24
CPCG01K7/18G01K7/183G05D23/2401
Inventor 郭旻沈科跃周骋官晓胜程京
Owner CAPITALBIO CORP
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