Vermes
Advanced Member level 4
It is a high performance workshop power supply with regulated tension 0-30V and regulated current limit 2mA-5A, with overload protection.
A multimeter displays tension, current, current settings and mAh transferred to the load. It was implemented on Atmega8, with LCD display 2x16 characters.
Basic elements of the power supply:
- power supply board was made in thermal transfer method and tinned
- the transformer withstands 6A
- a potentiometer was added for fine voltage tuning
- two KD502 Tesla (in the photo 2N3055) were applied as the final transistors
- resistor on the board was changed from 5W to 10W and adapted to the load 5A
- the front panel was designed in MS Word
- a thermal fuse that cuts transformer's power after exceeding 100 degrees Celsius on the heatsink was added (a microprocessor fuse with fans' controller is in the implementation)
- an output switch-off is used
- power supply has iec sockets and 3 fuses
Final effect:
The output tension doesn't decrease under load, it is very rigid, making it a very good power supply.
Tests:
Load test was reasonably well, after the short output circuit and set the maximum current at 5A, the power supply after 20 minutes stabilized the temperature at 105 degrees Celsius.
Construction time:
This device was built about 3 weeks. The board was already made.
Photos:
Link to original thread – Zasilacz 30V 5A by Kaeltaz
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