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Hotline：86-20-83238282
Fax：86-20-83238282
Email：sales@eccoelec.com
Address：201A, 2nd Floor, Main Building, 52 Huangsha Avenue, Liwan District, Guangzhou
Five minutes to study what is PFC Regulated Switching Power Supply
After rectification, the filter capacitor is not added, and the unfiltered pulsating positive half-cycle voltage is used as the power supply source of the chopper. Because the chopper's a series of positive voltage pulsating for "switching" work is "chopped" into a current waveform, the characteristics of the waveform are as follows:
1, the current waveform is intermittent, its envelope and voltage waveform are the same, and the envelope and voltage waveform are in phase.
2, due to the role of the chopper, the half wave pulsating direct current becomes a high frequency (determined by the chopper frequency, about 100KHz) "AC" electricity, the high frequency "AC" electricity to be rectified again to be used by the post-stage PWM switching voltage regulator power supply.
3, from the external power supply, the power system has achieved AC voltage and AC current in phase, and the voltage waveform and current waveform are in line with sinusoidal waveform, which not only solves the problem of power factor compensation, but also solves the problem of electromagnetic compatibility (EMC) and electromagnetic interference (EMI).
This high frequency "AC" electricity is fed by a PWM switching power supply that is rectified by a rectifier diode and filtered into a DC voltage (power supply). The DC voltage is referred to in some sources as: B+PFC (TPW-4211 is such), the chopper output B+PFC voltage is generally higher than the original 220 AC rectifier filter after the +300V, the reason is that the selection of high voltage, its inductor line diameter is small, line voltage drop is small, filter capacitance is small, and the filtering effect is good, low requirements for the post-stage PWM switching tube many benefits.
At present, in the PFC switching power supply part, the chopper tube (K) that plays the role of switching has two ways of working:
1. Continuous on-mode (CCM) : The operating frequency of the switching tube is certain, and the duty cycle (coefficient) of the on-switching tube changes with the amplitude of the chopped voltage. 2, discontinuous on-mode (DCM) : The operating frequency of the chopper switching tube changes with the size of the chopper voltage (the "on" and "off" time in each switching cycle is equal).
The PFC switching power supply part and PWM switching power supply part of the power factor correction switching power supply are completed by an integrated circuit, and an IC can complete the design.
The above is a brief introduction of the switching power supply PFC. It can be seen that the switching voltage regulator power supply has the characteristics of small inductance path, small line voltage drop and small filter capacitance. Compared with the traditional switching power supply, it has obvious advantages. Friends who still don't understand PFC switching power supply can take a few minutes to read this article, and I believe there will be unexpected gains.
Category： Power application
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