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Hello everyone, in this lesson we will take a look at the PWM power supply method

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The PWM power supply method is mainly composed of the main chip, the driver chip,

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the upper and lower tubes, the inductor and the filter capacitor

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This power supply method is generally called multi-phase PWM power supply.

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It is characterized by multiple power supplies,

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and is generally used in occasions with very high power.

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For example CPU power supply

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We can see in the mainboard that there are rows of inductors around the CPU socket.

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This row of inductors is the CPU power supply

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One inductor on most mainboards is one-phase power supply

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The workflow of this multi-phase PWM power supply method is more complicated

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But most can also be simplified to

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The first step, power supply and open signal

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The power supply here represents not only the power supply of the main chip driver chip,

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but also the input power supply.

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After the working conditions of the main chip are met,

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it will send out a PWM drive signal to control the drive chip

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When the driver chip receives the PWM drive signal,

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the driver chip will start working to drive the upper and lower tubes to generate power

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At the same time, the main chip generally monitors and adjusts the output voltage in real time.

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When the voltage is normal, the main chip will send a PG signal, indicating that the power supply is normal

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This is the simplified workflow of the PWM power supply method