Power supply design method based on frequency domain analysis

Abstract

The invention discloses a power supply design method based on frequency domain analysis. The method comprises the following steps: step one, assessing a test platform, measuring an open-loop transfer function of the test platform, and determining a design object; step two, loading a test object, according to a test parameter, obtaining a compensation parameter, and drawing a Bode diagram of the compensation parameter, and then superposing the Bode diagram of the compensation parameter and the Bode diagram of the open-loop transfer function to obtain a closed-loop curve; step three, adjusting the parameter of an error amplifier, selecting a parameter value, and debugging the selected parameter value in a specifically applied circuit board to obtain a Bode diagram response curve of a whole loop; and step four, confirming a test result, obtaining the Bode diagram of a closed loop on the test platform, and comparing the Bode diagram of the closed loop on the test platform with a computer simulation graph so as to confirm whether the two match each other. According to the invention, the design period is greatly reduced, the product quality is enhanced, and the research and development efficiency is improved.

Description

technical field [0001] The invention relates to the field of power supply design, in particular to a power supply design method based on frequency domain analysis. Background technique [0002] With the increasing maturity of the application of automatic control theory, more and more automatic control principles are applied to integrated circuits such as power control ICs, which ensures the stability of switching power supplies. Although power supply IC products with internal compensation have appeared on the market, they have not yet reached the level of popularization, and the price is relatively expensive. Therefore, many power supply ICs on the market still use external compensation circuits. The existence of externally compensated line-regulated power supply ICs shows that there are still many advantages in consideration of cost performance, so the current mainstream power supply solutions still use external compensation. What is worrying is that after network analysis...

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Problems solved by technology

[0028] For circuit schematic description, please refer to the attached figure 2 , the previous analysis is all for the analysis of the gain in the bode curve. We all know that the integral link can generate a pole, which will produce a lagging phase effect; the differential link will add a zero point, which will have the effect of leading the phase

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