A Power Supply Design Method Based on Frequency Domain Analysis

Abstract

A power supply design method based on frequency domain analysis, which includes the following steps: the first step is to evaluate the test platform, measure the open-loop transfer function of the test platform, and determine the design target; the second step is to load the test target, according to Test the parameters to obtain the compensation parameters, and draw the Bode diagram of the compensation parameters; then superimpose the Bode diagram of the compensation parameters and the Bode diagram of the open-loop transfer function to obtain a closed-loop curve; the third step is to adjust the parameters of the error amplifier, select parameter value, and the selected parameter value is debugged in the circuit board of the specific application, and the Bode diagram response curve of the whole loop is obtained; the fourth step is to confirm the test result, and obtain the closed-loop result on the test platform. Bode diagram, comparing the closed-loop Bode diagram on the test platform with the computer simulation diagram to confirm whether the two match. The invention greatly reduces the design period, improves the quality of products, and improves the research and development efficiency.

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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