A two-phase interleaved magnetically integrated boost converter without right-half-plane zero point

Abstract

The invention provides a two-phase staggered magnetic integration boost converter. Inductances La and Lb, and inductances Lc and Ld form two phase respectively; the drive signals of switch tubes S1 and S2 mutually stagger with each other by 180 DEG; the inductances La, Lb, Lc and Ld share the same magnetic core; and La is coupled with Lb and Lc in the opposite direction, and is coupled with Ld in the forward direction. The invention also provides a condition for removing a right half plane zero point through a converter. When the parameter design is reasonable, the converter can satisfy the minimum phase system within the wide duty ratio working range, and can greatly improve the dynamic response speed of the converter. Except for the above advantages, the output filtering inductances are integrated in the same magnetic core and the power density of the converter can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of DC-DC converters, in particular to a two-phase interleaved magnetically integrated boost converter. Background technique [0002] When the traditional multi-phase interleaved parallel boost works in CCM mode, the control-output transfer function contains a right-half plane zero. The control loop crossing frequency of this non-minimum phase system needs to be lower than the frequency where the right half plane zero point is located to ensure that the loop has sufficient phase angle margin, so the dynamic characteristics of this converter are poor. In addition, according to statistics, the cost of magnetic materials generally accounts for 30-40% of the DC-DC converter, and the weight generally accounts for about 20-30% of the whole. The filter inductance of each phase in the multi-phase also limits the power density of the converter. improve. Contents of the invention [0003] In order to solve the prob...

AI Technical Summary

Problems solved by technology

The control loop crossing frequency of this non-minimum phase system needs to be lower than the frequency where the right half plane zero point is located to ensure sufficient phase angle margin of the loop, so the dynamic characteristics of this converter are poor

In addition, according to statistics, the cost of magnetic materials generally accounts for 30-40% of the DC-DC converter, and the weight generally accounts for about 20-30% of the whole. The filter inductance of each phase in the multi-phase also limits the power density of the converter. improve

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