Landyacht's Flame-O-Watt (A thought)
When installing the new transistors... After bonding (screwing them) to the heat sink... You DID use a DMM and insure with a resistance check that the continuity between the metal -tab- of the r...
Forum Discussion
Excellent, current rather than voltage controlled.
Bi polar Junction transistor. Difficult to parallel without using resistor across emitter. Requires less driver current.
Rather than try and reinvent the wheel I would LOVE to see how MeanWell addresses the issue. Which type of transistor did they select for your unit...Type and possibly paralleling. A transistor ID and count would reveal much.
Single BJT IMHO have a fatal flaw in a high current switched power supply. They are severely limited by Vf that can easily exceed 1 volt. Thirty watts of saturation is insane. Explains why the driver circuit in your experiment smoked as well as the BJT. But I'll have to wait to see what circuit/transistor choice (amperage or voltage control technique) the MeanWell uses.
Patience Mex, Patience.
Bi polar Junction transistor. Difficult to parallel without using resistor across emitter. Requires less driver current.
Rather than try and reinvent the wheel I would LOVE to see how MeanWell addresses the issue. Which type of transistor did they select for your unit...Type and possibly paralleling. A transistor ID and count would reveal much.
Single BJT IMHO have a fatal flaw in a high current switched power supply. They are severely limited by Vf that can easily exceed 1 volt. Thirty watts of saturation is insane. Explains why the driver circuit in your experiment smoked as well as the BJT. But I'll have to wait to see what circuit/transistor choice (amperage or voltage control technique) the MeanWell uses.
Patience Mex, Patience.
