Adaptive on-time controlled power supply control system

Abstract

The invention provides an adaptive turn-on time control power supply control system, which comprises a primary side digital controller, a secondary side synchronous controller, a rectification unit, a power supply unit, a transformer unit, a primary side switching unit, a secondary side switching unit, a secondary side output capacitor and a current sensing unit, and is used for realizing a flyback power supply conversion function. Particularly, a secondary-side synchronous controller controls the opening and closing of a secondary-side switching unit to achieve a synchronous control function, and a primary-side digital controller reduces a primary-side drain source cross voltage of the primary-side switching unit and a secondary-side drain source cross voltage of the secondary-side switching unit in a mode of reducing a current sensing upper limit value. And the overall operation stability and durability are greatly improved.

Description

technical field [0001] The present invention relates to a power supply control system with adaptive on-time control, in particular, a secondary side synchronous controller, a secondary side switching unit, a secondary side output capacitor and a current sensing unit are arranged on the secondary side, and consist of The secondary side synchronous controller controls the opening and closing of the secondary side switching unit to achieve a synchronous control function. In particular, the primary side digital controller lowers the primary side switching unit’s primary side by reducing the upper limit value of the current sensing. The drain-to-source cross-voltage and the drain-to-source cross-voltage of the secondary side switching unit greatly improve the overall operation stability and durability. Background technique [0002] Since different electronic devices require a specific power supply to provide the required power, a high-quality and high-efficiency power conversion ...

AI Technical Summary

Problems solved by technology

Since the buffer needs to withstand a considerable surge, the quality requirements are very strict, so the overall cost is greatly increased, and it will also occupy a considerable circuit board area, making it difficult to further reduce the size of the end application product

[0006] In addition, if the secondary-side synchronous rectification architecture is used, it is often encountered that the switching units on the primary side and the secondary side are turned on at the same time under certain conditions and are damaged, so it is necessary to select the corresponding one on the secondary side. controller, resulting in a lack of flexibility in practical applications

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