Principle of isolated power supply

Isolation power supply is an important power electronic component, its core function is to isolate a safe low-voltage DC power supply from an unsafe high-voltage AC power supply, so as not to affect the low-voltage power supply, harm people's health and the normal operation of equipment. It generally includes an AC/DC (AC/DC) transformer, a filter circuit and a voltage regulator circuit, is currently automation equipment and measurement systems and other systems in the indispensable parts.

The main principle of isolating the power supply is to use the transformer transformer principle, the high voltage alternating current into low voltage direct current, so as to achieve the purpose of isolating the input signal and the output signal. The main structure of the transformer is composed of built-in winding, magnetic core, iron core and shell, etc. Its working principle depends on the fact that one part of the transformer (one winding) is inductively coupled winding, and the other part (winding) is output winding. Since the magnetic core is connected to them, the transformer can be used to reduce and increase the voltage.

The filter circuit that isolates the power supply is a circuit that blocks high frequency RF signals and protects the low-voltage DC power supply from malicious effects by filtering the capacitor. By filtering, you can suppress the power supply. (such as inverter, converter, etc.) pulse, so as to reduce the loss of the power system, prolong the life of the power supply.

Finally, the isolation power supply also has the function of voltage regulator circuit, it can stabilize the voltage, reduce the power supply drop caused by the circuit. Voltage regulator circuit can provide a stable low voltage DC power supply, with high precision and very low noise, is an indispensable part of the system.

Because of its unique safety and reliability, isolated power supply is widely used in the field of industrial control power system, such as automation equipment, instrument tester and control system. In addition, the isolated power supply can also be used in consumer electronic devices such as mobile phones, computers, televisions and wearables.

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