Motherboard power supply circuit principle

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The figure is a simple schematic diagram of the CPU core power supply circuit on the motherboard. In fact, it is a simple switching power supply. The core of the power supply circuit on the motherboard is the same. The +12V is the input from the ATX power supply, through a filter circuit consisting of an inductor and a capacitor, and then into a circuit consisting of two transistors (switches) that are controlled by the PMW Control (which controls the sequence and frequency of the switch conductance) Therefore, the voltage and current required for the control output of the part of the voltage requirement can be reached at the output. The waveform at the arrow in the figure can be seen as the output changes with time. After the filter circuit composed of L2 and C2, basically, a smooth and stable voltage curve (Vcore, now P4 processor Vcore=1.525V) can be obtained. This stable voltage can be used by the CPU to "enjoy". This is everyone. Often referred to as "one phase" in "multiphase" power supply.
Single-phase power supply can generally provide a maximum current of 25A, and today's commonly used processors have already exceeded this number, P4 processor power can reach 70~80W, working current even reaches 50A, single-phase power supply can not provide enough reliable power, so Now the motherboard's power supply circuit design uses a two-phase or even multi-phase design. Figure 2 is a schematic diagram of a two-phase power supply. It is easy to understand. In fact, it is the parallel connection of two single-phase circuits, so it can provide double current, and theoretically it can meet the needs of current processors.