Synchronous rectification boost-buck circuit and device with parallel connection phase-shifting staggered current-sharing control

Abstract

The invention discloses a synchronous rectification boost-buck circuit and device with parallel connection phase-shifting staggered current-sharing control. The synchronous rectification boost-buck circuit comprises more than one parallel-connection boost synchronous rectification circuit. Each boost synchronous rectification circuit comprises a capacitor C1, an inductor L, a current sampling point T, a switching tube Q1, a switching tube Q2 and a capacitor C2, wherein the capacitor C1 is in parallel connection at the input end, the inductor L is connected with the capacitor C1, the current sampling point T is connected at the rear end of the inductor L, the switching tube Q1 is in parallel connection between a positive pole and a negative pole of a power source, the switching tube Q2 is connected at the rear end of a current sampling point TA, and the capacitor C2 is in parallel connection at the output end. Compared with the prior art, the synchronous rectification boost-buck circuit and device achieves large-power conversion, switching frequency is multiplied due to staggered phase shifting, and peak currents of parallel-connection units are balanced and equal to one another. Due to the fact that the synchronous rectification boost-buck circuit and device has the function of parallel-connection unit synchronous rectification, loss is reduced, efficiency of the power source is improved, and compared with the size and cost of a traditional scheme, the size of the power source and cost are obviously reduced.

Description

technical field [0001] The invention discloses a rectification step-up and step-down circuit, in particular a synchronous rectification step-up and step-down circuit and device with parallel phase-shifting and interleaved current sharing control. Background technique [0002] Traditional buck-boost circuit topology technology. Such as figure 1 Traditional boost topology circuits, such as figure 2 Traditional step-down topology circuit: It uses switching tubes and rectifier diodes, which have large switching losses and low efficiency, and there is no dedicated control chip to realize parallel operation. The rectifier diode D is used as the rectifier element. Since the forward voltage drop of the rectifier diode D is relatively large, a fast recovery diode is especially used in a high-voltage conversion circuit. Therefore, the switching loss is large, the heat generation is large, and the efficiency is low, and there is no dedicated control chip to realize parallel operati...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the above-mentioned shortcomings that the step-up and step-down circuits in the prior art are not easy to convert high-power electric energy, the present invention provides a synchronous rectification step-up and step-down circuit and device with parallel phase-shifting and interleaved current sharing control

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