Integrated Magnetic Inductor for Ripple Suppression and Current Sensing
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Solution Overview
Problem
Existing single-tube inverter devices cannot meet high power requirements, leading to increased costs and complexity due to the need for multiple inductors and current sensors when parallel bridge arms are used.
Innovation Solution
A magnetic integrated inductor that integrates two power windings and a current sensor, capable of performing differential-mode current sampling while suppressing both differential-mode and common-mode current ripples, thereby reducing circuit volume and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate inductors are used for voltage boost and voltage drop, then the power management integrated circuit can perform both voltage boosting and voltage dropping functions, but the device area and power consumption increase
Solution Approach 1:
The patent combines two separate inductors (first inductor for voltage boost and second inductor for voltage drop) into a single integrated inductor structure. The integrated inductor includes a first winding for the boost operation and a second winding for the drop operation, sharing a common magnetic core. This merging reduces the overall device area while maintaining both voltage boosting and voltage dropping functions through magnetic coupling between the windings.
2Adaptability or versatility
If separate inductors are used for voltage boost and voltage drop, then the power management integrated circuit can perform both voltage boosting and voltage dropping functions, but the power consumption increases
Solution Approach 1:
The patent combines two separate inductors (first inductor for voltage boost and second inductor for voltage drop) into a single integrated inductor structure. The integrated inductor includes a first winding for the boost operation and a second winding for the drop operation, sharing a common magnetic core. This merging reduces the overall device area while maintaining both voltage boosting and voltage dropping functions through magnetic coupling between the windings.
3Power
If conventional separate inductor design is used, then the circuit can achieve high voltage conversion ratio, but the magnetic core size and device area increase
Solution Approach 1:
The patent implements a nested inductor configuration where the second winding is positioned within or alongside the first winding structure, both sharing a common magnetic core. This nesting arrangement allows the magnetic flux from both windings to utilize the same core volume efficiently, achieving high voltage conversion ratios for both boost and drop operations while minimizing the overall magnetic core size and device area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The magnetic integrated inductor reduces the number of components, minimizing the circuit volume and enhancing power density by effectively managing current ripples and performing current measurements.
Implementation Method 1
a first winding coupled to the first terminal and the second terminal, and a second winding coupled to the second terminal and the third terminal
Implementation Method 2
magnetic integrated inductor that includes a magnetic core and two windings wound around the magnetic core
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present application discloses a magnetic integrated inductor and an inverter, and the magnetic integrated inductor comprises: a first winding, a second winding, a third winding, a central column magnetic core, an upper magnetic core, a lower magnetic core, a left column magnetic core and a right column magnetic core; the upper magnetic core and the lower magnetic core being symmetrically arranged up and down; the central column magnetic core, the left column magnetic core and the right column magnetic core all being vertically arranged with respect to the upper magnetic core and the lower magnetic core; the first winding being wound on the left column magnetic core, the second winding being wound on the right column magnetic core, the third winding being wound on the central column magnetic core; an input terminal of the first winding being connected with an inverter circuit, an input terminal of the second winding being connected with an inverter circuit, an output terminal of the first winding being connected with an output terminal of the second winding; the first winding having the same number of turns as the second winding; an input terminal and an output terminal of the third winding being respectively connected with a signal processing circuit. The magnetic integrated inductor provided according to the present application can perform differential-mode current sampling while suppressing differential-mode current ripple and common-mode current ripple, thereby reducing the volume of the circuit and reducing the cost.