Practical Analysis and Design Technology of PWM Switching Power Supply

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Summary:

The structure of this article is:
In the first chapter, the introduction introduces the basic concept and structural principle of the switching power supply, and points out the specific research work and innovation of the paper.
The second chapter analyzes the interface principle of the test three block diagrams, starting from the data analysis of a simple LDO power supply, and introduces the characteristics and understanding of a popular PWM power chip.
In the third chapter, three typical power limiting methods of switching power supply PWM chip are compared and studied, which provides technical reference for overpower design of power system.
The fourth chapter focuses on a new method for quickly designing the main circuit of switching power supply.
The fifth chapter is based on the PSIM tool software to simulate the power circuit after design. Based on the measured power supply circuit of Tektronix oscilloscope, through further analysis, further optimization suggestions are proposed.
The sixth chapter is based on combing the results of the above theoretical analysis and contrast experiments, summarizing and forecasting the practical analysis and design techniques of switching power supplies.

Internal block diagram of the LD7575

LD7575 high voltage start-up circuit (including partial equivalent circuit) and its main waveform diagram

Main circuit schematic of switching power supply

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