Method for inhibiting temperature drift of switching power supply

Abstract

The invention relates to a method for inhibiting temperature drift of a switching power supply. The method comprises the following steps: S1, performing decomposition on the output voltage of the switching power supply by introducing a wavelet analysis method based on the randomness of the output voltage of the switching power supply; S2, performing training and prediction on the decomposed signalby using a least square support vector machine so as to obtain a prediction value of the output voltage; S3, analyzing the error of the prediction value and modifying the prediction result to obtainthe modified prediction value; and S4, performing temperature drift compensation on the switching power supply by adjusting the duty ratio based on the modified prediction value. By using the method disclosed by the invention, the temperature drift can be fast and accurately compensated in real time, and the method has the features of being high in prediction precision and well in adaptivity.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a method for suppressing temperature drift of switching power supplies. Background technique [0002] Switching power supply technology belongs to power electronics technology. It uses power converters to convert electrical energy. After converting electrical energy, it can meet various electrical requirements. Because its high efficiency and energy saving can bring huge economic benefits, it has attracted the attention of all aspects of society and has been rapidly promoted. [0003] Switching power supplies have some technical problems, such as temperature drift, etc. Temperature drift is a technical problem often encountered when switching power supplies work in a wide temperature range. It affects the output stability of switching power supplies and reduces the overall performance of switching power supplies. Therefore, It is becoming more and more important...

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Problems solved by technology

[0004] In some literatures related to temperature compensation technology, a method of using NTC thermistor to detect the ambient temperature is proposed, and the temperature drift is compensated by the cooperation of analog devices and NTC thermistor. Compared with fans and natural cooling, this design method is more economical. Simple, use the hardware design of the circuit to compensate the temperature, reduce the volume occupied by the fan, and reduce the cost, but because the analog device itself is greatly affected by the temperature drift, the inconsistency of the device characteristics, etc., designed by it The reliability of temperature drift compensation cannot be guaranteed. At the same time, once the compensation design of analog devices is completed, it is difficult to change it, which lacks flexibility. Moreover, the temperature compensation mentioned in the literature is compensation for high temperature conditions, and does not consider low temperature conditions. temperature drift compensation

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