The photo below shows the PC board for the LM2596 unit installed in the 4th PS123 power supply. I added a 3300 uF 35V capacitor, on the bottom of the board. It filters the output of the diode bridge for voltage ripple suppression at the input to the regulator. The regulator is installed in the center of the board next to a PCB mounted fuse. The screw terminals are input voltage on the left and regulated 13.8 volts output on the right.
The photo below shows the LM2596 regulator unit before installation on the board.
The photo below shows the test setup for the 0 to 3 amp current load test.
The test results are shown below. I tested and compared the performance of three regulator schemes. Load current is on the X axis, load voltage is on the Y axis. The first unit, blue curve, is the LM2596 unit, Unit 4. This unit output voltage declines 0.36 volt (2.8%) from no load at 3 amps load. The second curve in red, shows the performance of the 2N3055 regulator, Unit 1, which declines 0.88 volt (6.2%) at 3 amps load compared to no load. Finally, Unit 3, and original Philmore PS123, with a PNP 2SB410 pass transistor, shows a 0.34 volt decline (2.4%). Looks like the original design has better load regulations than either of the modified versions.
No comments:
Post a Comment