0-30V 0-10A Regulated Variable Power Supply Circuit Diagram
Introduction
A regulated variable power supply is an essential tool for any electronics enthusiast or professional. It provides a stable and adjustable voltage and current output, making it ideal for testing and powering electronic circuits. In this article, we will present a circuit diagram for a 0-30V 0-10A regulated variable power supply.
Circuit Diagram
The circuit diagram for the 0-30V 0-10A regulated variable power supply is shown below:
+---------------+
| |
| Input |
| (20-30V AC) |
+---------------+
|
|
v
+---------------+
| |
| Bridge |
| Rectifier |
+---------------+
|
|
v
+---------------+
| |
| Smoothing |
| Capacitor |
+---------------+
|
|
v
+---------------+
| |
| Voltage |
| Regulator |
+---------------+
|
|
v
+---------------+
| |
| Variable |
| Voltage |
| Regulator |
+---------------+
|
|
v
+---------------+
| |
| Current |
| Limitation |
+---------------+
|
|
v
+---------------+
| |
| Output |
| (0-30V 0-10A) |
+---------------+
Components
The circuit uses the following components:
- Transformer (T1): A 20-30V AC step-down transformer with a rated current of 10A.
- Bridge Rectifier (D1-D4): A full-wave bridge rectifier consisting of four 1N4007 diodes.
- Smoothing Capacitor (C1): A 220uF/35V electrolytic capacitor.
- Voltage Regulator (IC1): A 78L05 5V voltage regulator IC.
- Variable Voltage Regulator (IC2): A LM317 variable voltage regulator IC.
- Current Limitation (R1-R3, Q1): A current limitation circuit consisting of three resistors (R1=1k, R2=2k, R3=5k) and a 2N3055 transistor (Q1).
- Output (Vout): The output of the power supply, which can be adjusted from 0-30V and has a maximum current rating of 10A.
How it Works
The circuit works as follows:
- The input AC voltage is stepped down to a lower voltage using the transformer (T1).
- The AC voltage is then rectified using a full-wave bridge rectifier (D1-D4).
- The rectified voltage is smoothed using a 220uF/35V electrolytic capacitor (C1).
- The smoothed voltage is regulated to 5V using a 78L05 voltage regulator IC (IC1).
- The 5V regulated voltage is then used as the input to the variable voltage regulator (IC2), which is a LM317 IC.
- The output voltage of the variable voltage regulator is adjusted using a potentiometer (R2) and can be varied from 0-30V.
- The output current is limited using a current limitation circuit consisting of three resistors (R1-R3) and a 2N3055 transistor (Q1).
- The final output of the power supply is a regulated and variable voltage and current output, which can be adjusted from 0-30V and has a maximum current rating of 10A.
Advantages
This power supply circuit has several advantages, including:
- Adjustable output voltage: The output voltage can be adjusted from 0-30V, making it suitable for a wide range of applications.
- Adjustable output current: The output current can be limited to a maximum of 10A, making it suitable for applications that require a high current.
- Regulated output: The output voltage and current are regulated, ensuring a stable and reliable power supply.
- Simple and low-cost: The circuit is simple and uses low-cost components, making it an affordable option for DIY enthusiasts and professionals.
Conclusion
In this article, we have presented a circuit diagram for a 0-30V 0-10A regulated variable power supply. This power supply is ideal for testing and powering electronic circuits and has several advantages, including adjustable output voltage and current, regulated output, and a simple and low-cost design.
