![]() ![]() ![]() The graph below depicts the voltage that would be fed to the CPU/GPU at point B if the high-side switch was to remain closed for a sufficient amount of time:Īs can be seen, the purpose of the inductor in the circuit is to prevent the voltage from instantaneously reaching 12 V. As the inductor builds a larger magnetic field (i.e., charges up), the voltage drop becomes smaller and smaller until it's full charged and the voltage reaches 12 V. As the 12 V is applied to the inductor, the inductor builds up a magnetic field which creates a voltage drop at the output terminal. When the high-side switch is closed, the voltage at point A becomes 12 V but the voltage at the other side of the inductor doesn't change instantaneously, instead, the inductor continues to resists change in current. The goal of the circuit is to take the power supply voltage which is 12 V before point A and convert it to the much lower operating voltage of the CPU or GPU at point B which is something like 1.2 V. To the left of point B is the choke (or a filtering inductor). There are two MOSFETs just before point A, a low-side and a high-side, which serve as actual switches. On the left side is the typical 12 V which comes from the power supply unit. Shown is a basic schematic of a VRM circuit. Generally, a VRM circuit is usually implemented as a buck converter, but this is not strictly the only way to design it.
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