An Analog-Digital Hybrid Multiphase Interleaved Parallel Power Converter

Abstract

The present invention proposes an analog-digital hybrid multi-phase interleaved parallel power converter, which consists of a peak current control chip and a traditional boost converter to form a voltage source module, and then uses the multi-phase interleaved parallel structure to significantly reduce input and output current ripples. Each module is uniformly controlled by a digital control chip DSP, and the analog and digital parts are connected through a differential circuit to eliminate common-mode noise. The present invention adopts analog-digital mixed control, digitalization enables the converter to have the ability to realize complex control algorithms, and in addition, it can communicate in real time, dynamically change the number of modules, and realize multiple protections; the detection accuracy of the analog peak current is high, the response is fast, and the anti-interference strong ability. In addition, the modular power supply design is adopted, and its structure has been highly integrated. Relatively speaking, under the same working conditions, its working performance is obviously better than other pure analog systems or pure digital systems.

Description

technical field [0001] The invention belongs to the technical field of power converters, in particular to an analog-digital hybrid multi-phase interleaved parallel power converter. Background technique [0002] The traditional high dynamic response switching converter mainly adopts the multi-channel interleaved parallel structure of the double-loop control mode of the current loop and the voltage loop to improve the dynamic response speed, maintain the voltage control accuracy and reduce the voltage and current ripple. [0003] Voltage-mode control is the most commonly used control method in voltage-mode output power converters. It can eliminate the static difference of output voltage and maintain high precision, but it cannot respond immediately to load disturbances, and its dynamic response speed is not ideal. The current control can be divided into average current control, peak current control and valley current control, peak current control is the most widely used. Peak...

AI Technical Summary

Problems solved by technology

[0005] The traditional multi-phase interleaved parallel power converter based on the analog IC controller architecture has many power devices and poor stability. It cannot realize complex control algorithms, complex online adjustment of phase numbers, and complex protection circuits.

However, the multi-phase interleaved parallel power converter with pure digital structure is difficult to complete the peak current closed loop with high precision and fast response. If the average current detection is used, the circuit cost is high, and the anti-interference ability of multi-channel current detection remote test is poor.

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