What is transistor series regulator?

What is transistor series regulator?

A transistor series voltage regulator can be defined as a device that keeps the output voltage at a constant level. As shown in the figure, the transistor series voltage regulator acts as the regulating element. It takes the unregulated input and provides the regulated output.

How many transistors are used in series voltage regulator?

It is possible to use a simple two transistor circuit for a series pass regulator with voltage sensing and feedback.

How does a series regulator work?

Series regulators The series regulator works by providing a path from the supply voltage to the load through a variable resistance, usually a transistor (in this role it is usually termed the series pass transistor); it is in the “top half” of the voltage divider – the bottom half being the load.

What is the disadvantage of series regulator?

It has not so good voltage regulation for large loads currents. The series pass transistor should be power transistor and it has to be mounted on a suitable heat sink. This makes the series regulator circuit bulky and heavy.

What is the SI unit of efficiency?

The term efficiency is a dimensionless measure (sometimes quoted in percent), and strictly heat rate is dimensionless as well, but often written as energy per energy in relevant units. In SI-units it is joule per joule, but often also expressed as joule/kilowatt hour or British thermal units/kWh.

When does the transistor series voltage regulator work?

The transistor series voltage regulator working is when the voltage at the transistor’s base voltage is held to the stable voltage across the diode. For instance, if Zener voltage is 8V, the transistor’s base voltage will stay approximately 8V.

What are the limitations of a series voltage regulator?

The series voltage regulator can be defined as a regulator which has the limitations like high dissipation, less efficient, and the transistor voltage and Zener diode voltages are affected once the temperature rises. This voltage regulator circuit design is shown below.

How is a transistor emitter follower voltage regulator used?

The electronic circuit design for a simple transistor emitter follower voltage regulator is very straightforward. This circuit is not widely used on its own in a linear power supply, but may be used within other equipment to provide a step down voltage, etc from a higher voltage rail.

How is series resistance used in a transistor?

The Zener diode is used to set the fixed reference voltage to the transistor base. The voltage across Zener diode Vz always remains constant irrespective of change in input voltage. Series Resistance Rs – Series resistance RS is used to limit the current through Zener diode.