Board description
UM0933
4/16
Doc ID 17386 Rev 1
1 Board
description
This demonstration board represents a good starting point and a ready platform for a more
complete and dedicated system, even though it cannot be considered an industrial standard
welding machine and therefore is not for professional use. A particular method of
implementing welding current sensing is present on the board and patented. Thanks to the
cooperation of Magnetica, some magnetic components have been designed and optimized
for this application. All these components are orderable through Magnetica.
The layout of the power board has been optimized to have a low level of interference,
considering the power delivered and the current level present on many parts of the board.
Also the rectangular shape of the board and the position of the magnetic/silicon devices
were considered in order to guarantee a sufficient air flux on the parts which are more
involved in heat dissipation. An air fan is necessary for safe and reliable system use at all
times.
The board includes:
●
An input stage composed of a 25 A power rectifier bridge
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An input filter stage necessary for compliance with EMC emission levels
●
A small analog control daughter board (operational-amplifier TSM102 and SG3525
PWM generator)
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A power stage made up of a power IGBT or MOSFET and power ultrafast diodes.
●
A ferrite power high frequency transformer designed and manufactured for this
application
●
An output free air inductor with an auxiliary winding needed to implement the patented
output current sensing.
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