Power factor correcting device

Abstract

The present invention refers to power-factor correction device, consisting of ac / dc conversion circuit and PFC auxiliary circuit. Said device couples a group of auxiliary circuit between input end and output and output end of ac / dc conversion circuit, for increasing current conducting time and limiting working current peak value without the need to raise inductor choke and inductor value.

Description

technical field [0001] The invention relates to a power factor correction device, in particular to a passive power factor correction device capable of improving power factor. Background technique [0002] Power Factor (Power Factor) represents the relationship between effective power and total power consumption, that is, the ratio of effective power divided by total power consumption. Basically, the power factor can measure the degree to which electricity is effectively utilized. When the power factor value is larger, it represents the higher the power utilization rate. The operating principle of the Power Factor Correction (PFC) circuit on the power supply is to control and adjust the time and waveform of the AC current input to make it as consistent as possible with the DC voltage waveform, so that the power factor approaches 1. This is important for electronic equipment whose power requirements are large enough that otherwise the power equipment system may consume more p...

AI Technical Summary

Problems solved by technology

[0007] However, the passive PFC circuit designed with this architecture must increase the choke coil and inductance value of the inductor L1 as much as possible to increase the conduction time of the inductor L1 and limit the operating current I on the inductor L1. L1 The peak current, so as to in turn control the charging current of capacitor C1

However, if the choke coil and inductance of the inductor L1 are increased, the charging time of the capacitor C1 will be delayed, so that the capacitor C1 cannot obtain a complete charging process, thus affecting the DC voltage V output by the passive PFC circuit out1

In addition, if this passive PFC circuit is to be applied to a high-power power supply circuit, the choke coil and inductance value of the inductor L1 cannot be increased.

[0008] It can be seen that the above-mentioned existing power factor correction circuit obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

In order to solve the problems existing in the power factor correction circuit, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general products do not have a suitable structure to solve the above problems. Obviously, it is a problem that relevant industry players are eager to solve.

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