Electrical heating power closed-loop control method
A power closed-loop and control method technology, which is applied in the direction of control/regulation system, regulation of electrical variables, instruments, etc., can solve problems such as difficulty in ensuring control accuracy and large fluctuations in power values
Inactive Publication Date: 2009-03-18
BEIJING UNIV OF TECH
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Problems solved by technology
In this method, when the applied voltage fluctuates and the characteristics of the electric heating tube change, the output power value fluctuates greatly, and the control accuracy is difficult to guarantee.
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[0015] Provide following embodiment in conjunction with content of the present invention:
[0016] The device based on the method is composed of computer, LonWorks bus controller, LonWorks network adapter (PCLTA-20) digital electric meter, RS485-RS232 conversion module, AC thyristor voltage regulator, and electric heating tube. The voltage input terminal of the digital ammeter is connected to the three-phase alternating current, the digital signal output terminal is connected to the serial port of the computer through the RS485-RS232 conversion module, the voltage input terminal of the electric heating tube is connected to the three-phase alternating current through the AC thyristor voltage regulator, and the LonWorks bus control The communication network interface of the device is connected with the computer through the LonWorks network adapter installed in the computer, and the 0-10V analog voltage input port of the thyristor voltage regulator is connected with the 0-10V anal...
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The invention relates to an electrical heating power closed loop control method, which can heat with constant electric power according to required values of users, and can keep a higher adjusting precision even in conditions of external voltage fluctuated and characteristics of an electric heating pipe changed. The method includes receiving user's actual demand of heating power via computer programming, sampling the real time power consumption detected by a digital electric meter at real time via a series port and converting the samples into an average power according to the sample cycle via calculation, downloading the required power value of users and the power value of real time samples to a microcontroller via a computer after completing the conversion, comparing the required power value of users with the power value of real time samples after the microcontroller receiving the two values, and adjusting the magnitude of output voltage of a controllable silicon voltage regulator according to the compared result to maintain constant electric power consumption of the heating pipe, thereby achieving closed-loop control to electrical heating power. The invention realizes closed-loop control to electrical heating power, wherein the electrical heating device has the advantages of fast response, high flexibility, high interference resistance and the like.
Description
technical field [0001] The invention relates to a closed-loop control method for electric heating power. The method can perform constant electric power heating according to the value required by the user, and can still maintain high adjustment accuracy under the conditions of fluctuations in the applied voltage and changes in the characteristics of the electric heating tube. Background technique [0002] In some occasions where constant power heating is required according to the value required by the user, the traditional method is open-loop control, that is, there is no feedback link between the power output value of the electric heater and the input terminal of the controller. In this method, when the applied voltage fluctuates and the characteristics of the electric heating tube change, the output power value fluctuates greatly, and the control accuracy is difficult to guarantee. Therefore, it is necessary to use advanced computer control technology to improve the traditi...
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Inventor 王瑞华王普张亚庭
Owner BEIJING UNIV OF TECH