Abstract
Inductor size is one of the biggest challenges to reduce the size of the portable electronic devices. Several methods are presented for reducing inductor’s size, among which LTCC has a specific significance in low power converters. Given the fact that it does not need any additional control circuits and also by considering its structure and constituent materials, the value of this inductor and its efficiency increases. This paper investigates LTCC inductor with the inverse coupling method in form of a multi-permeability structure. First, the inverse coupling inductor is considered in vertical and lateral flux patterns in the single permeability state and then, these inductors’ behaviors are considered in a multi-permeability structure by optimizing inductor’s core. Ultimately, a new structure in multi-permeability lateral flux inductor is presented which leads to increasing inductance density that is more phenomenal in low currents. Then, the behavior of the proposed inductor is investigated in a buck converter with 1.5 MHz switching frequency. It is observed that power density increases up to 735 (w/in3). Performance accuracy of mentioned inductor is confirmed by simulation in MATLAB and FEA2D FLUX.
Highlights
With the expansion of electrical circuits and electronic devices, the desire to minimize the size of devices has increased
The magnetic materials used in the LTCC inductors are the green material types with the commercial names of ESL40010, ESL40011, ESL40012 which have a permeability coefficient of 50, 200, and 500, respectively [10]
This paper investigated inverse coupled inductor with vertical and lateral flux patterns in multi-permeability state
Summary
With the expansion of electrical circuits and electronic devices, the desire to minimize the size of devices has increased. Various structures of specific and nonlinear inductors have been discussed to optimize converter performance, reduce losses, and increase the efficiency and inductor density [5,6,7]. These methods have some disadvantages like, including using additional circuits for increasing efficiency [8]. With a similar size and a normal inverse coupling inductor, the proposed hybrid LTCC inductor reaches power density of 735 (W/in3) and inductance of 310 nH in low currents (which is 90 nH higher than the normal inverse coupled inductor) [15]
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