Design and Analysis of Planar Transformers in Modern Switching Mode Power Supply

Hassan, Islam; Sayed, Khairy

doi:10.21608/sej.2021.94318.1003

Cited by 1 publication

(1 citation statement)

References 26 publications

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“…The power supplies are widely used in various electronic applications, such as Light Emitting Diodes (LEDs) [1,2], sensors [3], wearable electronics [4,5], medical devices [6], smart phones [7] and so on. Miniaturization of the power supply has become the main focus for developing future generation integrated power supplies.…”

Section: Introductionmentioning

confidence: 99%

MEMS-Casting Fabricated Chip-Style 3D Metal Solenoidal Transformers towards Integrated Power Supply

Wang

Chen

Chen³

et al. 2022

Micromachines

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A silicon-chip-based 3D metal solenoidal transformer is proposed and developed to achieve AC-DC conversion for integrated power supply applications. With wafer-level micro electromechanical systems (MEMS) fabrication technique to form the metal casting mold and the following micro-casting technique to rapidly (within 6 minutes) fill molten ZnAl alloy into the pre-micromachined silicon mold, 45-turns primary solenoid and 7-turns secondary solenoid are fabricated in silicon wafers, where the two intertwining solenoids are located at inner deck and outer deck, respectively. Permalloy soft magnetic core is inserted into a pre-etched channel in the silicon chip, which is surrounded by the solenoids. The size of the chip-style transformer is as small as 8.5 mm × 6.6 mm × 2.5 mm. The internal resistance of the primary solenoid is 1.82 Ω and that of the secondary solenoid is 0.16 Ω. The working frequency of the transformer is 60 kHz. Combined with the testing circuit of the switch mode power supply, the DC voltage of 13.02 V is obtained when the input is 110 V at 50 Hz/60 Hz. Furthermore, the on-chip 3D solenoidal transformer is used for lighting four LEDs, which shows great potential for AC-DC power supply. The wafer-level fabricated chip-style solenoidal AC-DC transformer for integrated power supply is advantageous in uniform fabrication, small size and volume applications.

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