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Voltage regulator transistor

Voltage regulator transistor

Introduction to product description: Regulated power supply is an indispensable part of electronic circuit design. Its main function is to provide a stable and usual direct current for later work. The development of regulated power supply has appeared in various forms today. With the increasing voltage requirements of modern electrical equipment, a more reliable power supply is needed to supply power. Under such circumstances, the stabilized power supply circuit has also been greatly improved and developed. And there are many forms of power supply. This kind of power supply with digital display. It can output different voltage and current according to different needs of people. Often the power is as high as several hundred watts.

Product Details

product description:

Regulated power supply is an indispensable part of electronic circuit design. Its main function is to provide a stable and usual direct current for later work. The development of regulated power supply has appeared in various forms today. With the increasing voltage requirements of modern electrical equipment, a more reliable power supply is needed to supply power. Under such circumstances, the stabilized power supply circuit has also been greatly improved and developed. And there are many forms of power supply.

This kind of power supply with digital display. It can output different voltage and current according to different needs of people. Often the power is as high as several hundred watts.

Regulated power supply circuit board:

Circuit boards are becoming more and more complex. New functions such as detection, protection, sampling, adjustment, constant current and constant voltage, memory functions are integrated in the circuit. Make people's use more convenient.

Multiple fixed power supply stabilized power supply:

This kind of power supply adopts a fixed output method, which can often provide a large amount of power and output of a variety of different power levels. His hollow design provides better conditions for the heat dissipation of the circuit board. Because of its high reliability and low cost, it is widely used in occasions with relatively high requirements for voltage and current. To have a thorough understanding of the regulated power supply, we must start with the simplest circuit and analyze step by step to know the basic working principle of the regulated power supply. Let's talk about the basic composition and principle of the voltage regulator circuit.

Triode circuit composition:

It is a circuit composed of two electrolytic capacitors, a bias resistor, a load resistor, a Zener diode, and an NPN transistor. This circuit is relatively simple, let's analyze its voltage regulation process.

Voltage stabilization process:

When the voltage at the power input terminal U1 increases, the voltage across the filter capacitor C1 will also increase at the same time. Because the voltage on the filter capacitor U1 increases, the current flowing through R1 and the Zener diode VZ will increase, and the load The voltage across the resistor R1 will also increase. Since the Zener diode has the characteristic that the voltage at both ends remains unchanged after breakdown (ie the voltage regulation characteristic of the Zener diode), the voltage UB at point B remains unchanged, and the transistor VT The base voltage will also remain unchanged. The base current Ib of the triode does not change. The collector current Ic of the triode will not change either (because Ic is equal to β*Ib, both values ​​of Ib and β remain unchanged. So Ic will not change either). Because the current of Ic remains the same, the charging voltage U2 of Ic to C2 also remains the same, thus realizing the voltage stabilization that keeps the output voltage constant when the input voltage rises. This is the voltage stabilization process of the entire circuit.


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