High Current Variable Power supply
The design of a high current variable power supply circuit typically involves the use of a more robust voltage regulator or a combination of components that can handle higher current levels. One common approach is to use a power transistor in conjunction with a voltage regulator IC to increase the current capacity.
In such a configuration, the LM317 can be used to provide a stable reference voltage and regulate the output voltage, while a high-current transistor, such as a power MOSFET or a bipolar junction transistor (BJT), is employed to handle the increased load current. The transistor is connected in a way that it amplifies the current output from the LM317, allowing the circuit to supply higher currents without exceeding the limits of the LM317.
The circuit typically includes several key components:
1. **Voltage Regulator (LM317)**: This IC is used to maintain a constant output voltage. It requires a minimum input-output voltage differential (usually around 3V) to function properly and is adjustable using external resistors.
2. **Power Transistor**: A high-power transistor is used to amplify the current. It should be selected based on the maximum current and voltage requirements of the application. The transistor is connected in the output stage of the circuit.
3. **Resistors**: Resistors are used to set the output voltage of the LM317 and to provide feedback for stable operation. The values of these resistors are calculated based on the desired output voltage.
4. **Capacitors**: Capacitors are often included in the circuit for stability and noise filtering. A bypass capacitor is typically connected close to the input of the LM317 to filter out high-frequency noise.
5. **Heat Sinks**: Given that high current applications can generate significant heat, appropriate heat sinks should be used with the power transistor and the LM317 to prevent thermal overload.
6. **Protection Diodes**: Diodes may be included for protection against reverse polarity and to prevent damage to the circuit from inductive kickback if the load is inductive.
By integrating these components into a single circuit, a high current variable power supply can be achieved, capable of delivering adjustable voltages at currents exceeding 1 ampere. This configuration is suitable for various applications, including powering motors, charging batteries, and testing electronic devices that require higher current levels. Proper design and component selection ensure reliability and performance in demanding environments.High Current Variable Power supply Circuit Diagram. The popular Variable voltage regulator IC LM317 can handle only up to 1 ampere current and hence it is not suitable for making a high current variable power supply 🔗 External reference
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