scholarly journals Development Of An Interdisciplinary Undergraduate Laboratory For A Course On Design And Manufacture Of Surface Mount Printed Circuit Board Assemblies

2020 ◽  
Author(s):  
Maher E. Rizkalla ◽  
Carol L. O'Loughlin ◽  
Charles F. Yokomoto
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Surface Mount ◽  
Printed Circuit ◽  
Undergraduate Laboratory ◽  
Design And Manufacture

Performance Comparison Between Surface-mount and Embedded Power Modules

2019 ◽  
Vol 2019 (DPC) ◽  
pp. 000647-000670
Author(s):  
Gerald Weis
Keyword(s):  
Printed Circuit Board ◽  
State Of The Art ◽  
Circuit Board ◽  
Switching Frequency ◽  
Surface Mount ◽  
Printed Circuit ◽  
Power Transistors ◽  
Wide Range ◽  
Power Switches ◽  
Embedded Power

Increasing efficiency in power electronic circuits requires innovative cooling concepts and a low impedance connection in the power path as well as low inductance driving circuits placed as close as possible to the main power switches. A direct comparison between state-of-the-art standard surface-mount build-ups and power switches embedded directly into the printed circuit board shows the high potential of integrated electronics. Measurements at defined operating point(s) verify improved thermal performance due to more heat spreading area, as well as higher achievable switching speed. For performance benchmarking two similar versions of half bridge circuits in DC-DC buck configuration were built to be compared in measurement. The first configuration uses standard, state-of-the-art SMD packages assembled onto the module. For the second half bridge module an embedded power path was used: The power transistors (GaN HEMT devices) are mounted inside the printed circuit board (PCB) and galvanically isolated from the heat sink pad on top of the package. Both versions use exactly the same schematic, layer stack-up and copper structure on the six layers used. A slightly different laser drill configuration was necessary because embedded parts are connected by copper filled laser drill holes. This measure was taken to optimize the modules according to their technology. Each module has an NTC thermistor mounted at the same distance to the half bridge transistors, and is used to indicate the temperature of the transistor dies during measurement. To cover a wide range of operational conditions the devices under test (DUTs) were stressed under hard switching operation (HSW) as well as triangular current mode (TCM). HSW causes more stress because the opposite transistor is switched before the whole energy of Coss has been discharged. In TCM the current through the inductor is becoming negative for a short time period and discharges the Coss capacitors of the power transistors. The test conditions were set as follows: 150V, 11A with 200kHz switching frequency in HSW mode. The switching behavior is similar, because both modules uses the same power transistors. Due to less parasitic impedance at the embedded module the turn-on behavior is slightly improved at the embedded module. Embedding as a new, innovative concept is compared to standard technologies. First measurements show that the embedded DUT stays 20K below the temperature of the standard module while running at the same load current. Additionally fewer disturbances were observed at the embedded module.

scholarly journals Miura-ori enabled stretchable circuit boards

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Yongkai Li ◽  
Weixuan Liu ◽  
Yang Deng ◽  
Wei Hong ◽  
Hongyu Yu
Keyword(s):  
Industrial Production ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Stretchable Electronics ◽  
Circuit Boards ◽  
Engineering Applications ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
Design And Manufacture

AbstractOrigami, an ancient form of papercraft, provides a way to develop functional structures for engineering applications. In this paper, we report an approach to design and manufacture a stretchable circuit board (SCB) with origami structures. The benefits of developable, flat-foldable, and rigid-foldable origami-based structures as SCBs are discussed, and a representative structure, Miura fold (or Miura-ori), is chosen to be investigated. Under the constraints induced by the mounted components’ dimensions, the Miura-ori structures for specific applications can be defined. We propose three methods for better fabrication, including direct folding, stiffness modification, and kirigami enhancement, to improve a planar sheet’s foldability. A wearable ECG (electrocardiogram) system based on MO-SCB (Miura-ori enabled SCB) technology is built, and the stretchable portion is made of commercial FPCBs (flexible printed circuit board), providing desired stretchability and reliability. The proposed technology routine is compatible with industrial production and may pave the application of stretchable electronics.

Sign in / Sign up

Export Citation Format

Share Document