How do you build a variable voltage power supply?
Table of Contents
- 1 How do you build a variable voltage power supply?
- 2 How do you find constant voltage output?
- 3 What is constant voltage source?
- 4 What are constant voltage and constant current source?
- 5 What is the role of a voltage regulator in 5V power supply?
- 6 How to select a transformer for 5V DC power supply design?
How do you build a variable voltage power supply?
To make Variable DC power supply, you will required following list of components;
- Transformer 220V to 30V ,2A rating.
- Diodes.
- High capacitance capacitor (1800uF)
- Small capacitors for IC.
- IC LM317.
- Resistors of 500 ohms.
- 1.5A fuse.
- Probes .
How do you find constant voltage output?
Some of the methods of obtaining the constant voltage include using a voltage divider, series transistor, Zener diode or a combination of Zener diode and switching device such as a transistor or thryristor.
How do you regulate voltage output?
One of the simplest ways to regulate voltage is with a Zener diode. While linear regulators are usually basic in design, a Zener diode provides adequate voltage regulation in a single component.
How do you increase the output current of LM317?
The popular LM317 voltage regulator IC is designed to deliver not more than 1.5 amps, however by adding an outboard current boost transistor to the circuit it becomes possible to upgrade the regulator circuit to handle much higher currents, and upto any desired levels.
What is constant voltage source?
A constant voltage source is a power source which provides a constant voltage to a load, even despite changes and variance in load resistance. In other words, the voltage which a constant voltage source provides is steady, even if the resistance of the load varies.
What are constant voltage and constant current source?
DC regulated power supplies are broadly classified into “DC constant voltage power supplies” whose output voltage is stable even when the load changes and “DC constant current power supplies” whose output current is stable.
What is regulated output voltage?
The term regulated here refers to a unit which maintains a constant output voltage irrespective of the changes in the input voltage or frequency and independent of the variations in the output load conditions. Simply put, it converts unregulated AC voltage into constant DC voltage.
How does regulated power supply produce constant output?
Regulated power supplies have voltage regulators on their output. This means that the regulator ensures the output voltage will always stay at the rated value of the power supply, regardless of the current that the device is consuming.
What is the role of a voltage regulator in 5V power supply?
It is the most inexpensive filter for our basic 5V power supply design. A regulator is the linear integrated circuit use to provide a regulated constant output voltage. Voltage regulation is very important because we do not need a change in output voltage when the load changes. An output voltage independent of the load is always required.
How to select a transformer for 5V DC power supply design?
This means we should select the transformer with a secondary voltage value equal to 9V or at least 10\% more than 9V. From these points, for the 5V DC power supply design, we can select a transformer of current rating 1A and a secondary voltage of 9V.
Can I make a 5V DC circuit without a rectifier?
Without the rectifier circuit, it is not possible to have the required output 5V DC voltage. This circuit comes in nice integrated packages or you can make it using four diodes as well. You will see how we design it in later sections.
What is the secondary voltage of a rectifier transformer?
The rectifier has its own voltage drop across it i.e. 1.4V. We need to compensate for this value as well. This means we should select the transformer with a secondary voltage value equal to 9V or at least 10\% more than 9V.