As a product widely used in industry, switching power supply is a high-frequency electric energy conversion device and a common power supply. The function of switching power supply is to convert a level of voltage into the voltage or current required by the client through different forms of architecture.

In this issue, Heketai takes a customer's switching power supply product as an example. This product has the characteristics of short circuit, overcurrent, overvoltage, temperature protection, low power consumption, etc. Its output voltage accuracy is relatively high, its output has built-in filtering, and its ripple noise is low. It is suitable for many scenes, such as industrial control, inverters, surveillance cameras, charging piles and power control.

The ideal constant voltage source means that the output voltage is constant and will not change due to the changes of load resistance, input terminal voltage and temperature. The internal resistance R is equal to zero, but the actual constant voltage source has internal resistance R.. How does this isolated switching power supply realize constant voltage and voltage stabilization?

Its working principle is like this. The principle of switching regulated power supply mainly includes several aspects, one is feedback control, the other is modulation, the third is filtering, and the fourth is voltage regulation. When the power supply works, the input AC voltage first passes through the rectifier circuit and is converted into DC voltage. The rectifier circuit needs to use discrete devices and resistors.

Schematic diagram of common voltage stabilizing circuit

Heketai products are widely used in isolated constant voltage and regulated power supply 70W switching power supply, including diode 1N4148 encapsulated by LL-35, RS1M encapsulated by SAM, 1N4007 encapsulated by SOD-123, bridge stack product SS310 encapsulated by SMA, integrated circuit TL431 encapsulated by SOT-23, etc.

In the above picture, this 70W power switching power supply not only uses Heketai's discrete device products, but also uses Heketai's resistors, capacitors and other products. As an original manufacturer of electronic components with complete products, Heketai's products have been recognized by many customers.