Method for inhibiting temperature drift of switching power supply

Abstract

The invention relates to the technical field of switching power supply, in particular to a method for inhibiting temperature drift of a switching power supply. The method is applied to a device comprising a PWM module, an ADC module, a comparator and a digital PID regulator module. The method comprises the following steps: establishing a neural network parameter model by the digital PID regulator module; establishing a parameter model by using a neural network according to a temperature drift rule in a wide temperature environment; training to obtain a temperature drift compensation data look-up table of PWM driving duty ratio (Delta)d, so as to more quickly compensate the temperature drift of the power supply based on the look-up table; calculating and obtaining a changed duty ratio; obtaining a changed output DC voltage value based on a comparison result of the comparator. The method adopts a simple and effective single-cycle modulation mode modulation strategy.

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] Since the 1950s, after decades of development, switching power supplies have gradually replaced traditional phase-controlled regulated power supplies. At the end of the 1970s, foreign countries first developed a pulse width modulation (PWM) controller integrated circuit [1], which made a greater breakthrough in the development of switching power supply in the direction of integration. The development of power electronic devices provides the necessary conditions for the development of power electronics technology, and also promotes the rapid development of switching power supplies. The frequency of switching power supplies is further increased, making the power supply smaller, lighter, and power density has been further improved. The emergence of IGBT allows swit...

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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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