DC power supply voltage regulator circuit
For DC power supply, although the rectifier filter circuit can provide a relatively smooth DC current, however, due to the voltage fluctuation or load fluctuation, the output voltage is often unstable. In many occasions, it is necessary to use the voltage stabilizing circuit to stabilize the output out voltage, so that the output voltage does not fluctuate with the grid voltage or load. Now the commonly used DC power supply circuit is mainly divided into linear voltage regulator power supply circuit and switching power supply circuit. The output of the linear regulated power supply is smooth, the stability is good, the interference is small, the volume is large, the power consumption is large, the efficiency is low, and the load capacity is poor, it is usually used in circuits that are small in current and sensitive to interference. The switching power supply has the advantages of small volume, large output power, high efficiency, high frequency interference, low price, and extensive use.
1.When the voltage stabilizing diode of the voltage regulator circuit works, the cathode is connected with the high potential, the anode is connected with the low potential, the two ends voltage is Uz, and the current range is Iz ~ IzM. The voltage regulator circuit is the basic unit circuit of the DC regulated power supply, which is mainly used in some small current occasions, and is also used to form the reference voltage.
2.Three terminal voltage
Regulator integrated circuit three terminal voltage regulator integrated circuit is a common linear regulator circuit, good performance, easy to use, low cost, the application is very extensive.
The common three terminal voltage regulator integrated circuits are divided into 78 series and 79 series, 78 series are positive power supply, and 79 series are negative power supply, and the latter two digits of the model represent the output voltage for example, the output of 7805 is + 5V, and the output of 7912 is -12V.
Adjustable voltage regulator integrated circuit linear voltage regulator in addition to the 78 series and 79 series can output a fixed voltage, as well as the output voltage can be adjusted, for example, LM317, TL431 and so on. The output voltage of LM317 is 1.237V, which can output the current of 1.5A, with protection circuit inside.
This article is from Allicdata.