searchwing-powermodule [Digitale Elektronik und Technische Informatik]

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===== Power Module =====

Author: Friedrich Beckmann

The power module comprises 

  * MOSFET based power switch to switch off the battery from all electronics
  * 5.38V DC/DC converter to supply the PixRacer autopilot, GPS, FrSky RC receiver
  * Battery voltage and current measurement circuit for the PixRacer
  * 5.38V DC/DC converter for the Raspberry Pis and the RFD868+ telemetry

The design is done with Easyeda and is available here: [[https://easyeda.com/SearchWing/searchwingpower|Easyeda SearchWingPower]]. The board has been produced at JLCPCB and two have been soldered at the ASSCON Demolab.

{{::sw-powermodule-board.jpg?600|Search Powermodule board}}

{{::sw-pm-solderpaste.jpg?600|Search Powermodule with components}}

=== Voltera V-one ===

I have a [[https://www.voltera.io|Voltera V-One]] printer which can be used to dispense the solder paste. This needs to be tested. In the ASSCON lab we used the stencil printing method.

==== Manufacturing ====

No talk. Just facts. Only the first board is without placement errors.

{{::boardbugs.png|}}

=== PCB Manufacturing at JLCPCB ===

PCBs can be ordered from JLCPCB directly from EasyEDA. In the PCB view choose "PCB Fabrication File (Gerber)". The default options for production are fine. Please choose "LeadFree HASL-RoHS" as surface finish.


==== Releases ====

=== v1.1 ===

  * {{ ::schematic_searchwingpower_20191212070747.pdf | Schematics in pdf}}
  * {{ ::bom_searchwingpower_20200113223319.pdf | BOM pdf}}
  * {{ ::searchwingpowerv1-1_gerber_layoutall_20191212070330.zip | Gerber Layout data in zip}}


==== Remarks about handling ====

With a disconnected power switch the power module powers the components. This is a avionics safety feature to ensure power is delivered even with a broken power switch or power switch cable.