What is the switching power supply used for?

Switching power supply is an electronic device used to convert alternating current into direct current. Its working principle is based on pulse width modulation technology, and its main functions include voltage conversion, current limiting, isolation and ripple suppression. Switching power supplies are widely used in a variety of electronic equipment, including computers, mobile phones, televisions, audio systems and industrial equipment.

The role of switching power supply

The switching power supply is an electronic device used to convert alternating current (AC) into direct current (DC). It is widely used in various electronic equipment to provide stable DC power supply.

Working principle

The working principle of the switching power supply is based on pulse width modulation (PWM) technology:

• Rectification and filtering: First, the alternating current is converted into pulsating direct current through a rectifier, and then filtered through a capacitor to produce a relatively smooth direct current.
• Switch: There is a switching element in the switching power supply, usually a power transistor, which is responsible for periodically switching the DC current on and off.
• Transformer: The switching operation of the switching element will generate alternating current, which is voltage converted and isolated through the transformer.
• Rectification and filtering (secondary side): The alternating current on the secondary side of the transformer is rectified and filtered again to produce the final DC output voltage.

Main functions

The main functions of the switching power supply include:

• Voltage conversion:Convert alternating current Convert to the required DC voltage, which can be step-up, step-down or maintain the original voltage.
• Current limit: Prevent overcurrent from damaging the load or the power supply itself.
• Isolation: Provides electrical isolation between the input and output terminals through a transformer to improve safety.
• Ripple suppression: Filter out the AC component in the output voltage and provide clean DC power.

Application fields

Switching power supplies are widely used, including:

• Computers, laptops, mobile phone chargers
• TV, audio system
• Industrial equipment, medical equipment
• Electric vehicle charger

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