Analysis of protection circuits for several switching power supplies

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

LC03-3.3 SOP8 TVS Static Protection 3.3V

Overview:
The quality index of the switching power supply should be evaluated based on safety and reliability. Under the condition that the electrical technical indicators meet the requirements of normal use, in order to make the power supply work safely and reliably under harsh environment and sudden failure, it is necessary to design various protection circuits, such as anti-surge soft start, anti-overvoltage and undervoltage. , overheating, overcurrent, lack of equal protection circuit.

In order to make the switching power supply safe and reliable under harsh environment and sudden fault conditions, several practical protection circuits are proposed in this paper, and the working principle of the circuit is analyzed in detail.

Three-phase three-wire power supply phase loss protection circuit:

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