power supply

Application

power supply

Definition
The English full name of PFC is "Power Factor Correction", meaning "power factor correction", power factor refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power divided by the total power consumption (apparent power). Basically, the power factor can measure the degree of effective use of electricity, and the higher the power factor value, the higher the power utilization rate.

PFC (power factor correction) topology has three common working modes: CCM current continuous, DCM discontinuous and CRM critical. PFC topology has relatively high requirements for MOS tubes. Under the condition of ensuring system efficiency and temperature rise, system stability should be improved as much as possible. The control loop speed of PFC topology is relatively slow. In order to smooth 100Hz-120Hz AC rectification ripple, the reaction time of PFC topology must reach several 10ms. If there is no special optimization of the control circuit and IC, the PFC topology often produces a large impact current during the startup process, and the impact current can reach 5-10 times of normal operation, especially in the repeated switching process, which is a more stringent test for the MOS tube. MOS tube in PFC topology is straddled between high voltage and ground, and the EAS capability of MOS tube is also an important reference to evaluate its reliability during safety test. Therefore, the switching characteristics (Ciss), EAS capability, surge resistance and electrostatic protection of MOS tube need to be considered when selecting MOS tube in PFC circuit.

Topological graph

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