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How the circuit works
Formula 1st Ohm's Law
- V - Voltage or electric potential
- R - Electrical resistance
- I - Electrical current
Calculating the load resistors
- V = R * I
- V = The cut-off voltage of transistors Q2 and Q3 TIP36C is 0.6V. This is the cut-off range of the transistor. Let us call Q2 and Q3 of Qeq
Then:
- R1 = Vbe_Qeq / I_CI1
- R1 = 0.6V / 0.6A
- R1 = 1 Ohm
Calculation of the protection circuit resistance
- V = R * I
- V = The cut-off voltage of the transistor Q1 is 0.6 V. "This is the cut-off range of the transistor".
- I = The total current of the power supply, which is 6A.
Then:
- R1 = Vbe_Q1 / I_ps
- R1 = 0.6V / 6A
- R1 = 0.1 Ohm
Current of the power transistors
- P = 5V * 25A = 125W.
- Pmax = V * I:
- Imax = P / V = > Imax = 125W / 37V = > Imax = 3.37A
- How are two transistors together Imax = 6,74A
Fig. 2 - Schematic diagram Adjustable power supply circuit with short circuit protection |
Components List
- CI1 ................ Voltage Regulator LM317
- Q1 ................. PNP Transistor BD140
- Q2, Q3 .......... Power Transistor PNP TIP36C
- D1 ................. Bridge Rectifier 50A - KBPC5010
- D2, D3 .......... Rectifier Diode 1N4007
- R1 ................. Resistor 2W / 1Ω
- R2, R4, R5 ... Resistor 5W / 0.1Ω
- R3 ................ Resistor 1/4W / 220Ω
- C1 ................ Electrolytic Capacitor 5600uF - 50V
- C2, C3 .......... Polyester/Ceramic Capacitor 0.1uF or 100nF
- RV1 .............. Potentiometer 5KΩ
- P1, P2 ........... Screw Terminal Type 5mm 2-Pin Connector
- Others .......... Wires, solders, printed circuit board, etc.
Download
We provide the files with the PCB, the schematic, the PDF, GERBER and JPG, PNG and provide a direct link for free download and a direct link, "MEGA".
Click on the direct link to download the files: Layout PCB, PDF, GERBER, JPG
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