Method of DC power device for improving power factor and adjusting output voltage

Abstract

The invention relates to power technique fields, especially direct current power device with power factor emendation function, method of increasing power factor of power device and adjusting the output voltage of the power device. The method of increasing power factor of power device uses reactor to short alternating current to improve current wave before commutating bridge, and uses reactor to short alternating current at later evening, so the input current wave sinus degree is more higher, power factor is higher, harmonization emission extent is smaller. The invention increases power factor, and also provides method of adjusting said direct current power device output voltage, so the output voltage can be adjusted real time.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a DC power supply device with a power factor correction function, a method for improving the power factor of the power supply device, and a method for adjusting the output voltage of the power supply device. Background technique [0002] In the existing common power factor correction (PFC, Power Factor Correction) scheme, there are mainly two ways of passive power factor correction and active power factor correction. The passive power factor correction method is composed of reactors and capacitors, which has limited improvement, high cost, and large device volume. The active power factor correction method is the so-called active PFC circuit formed by adding inductance and switching devices before the capacitors behind the rectifier bridge. However, the frequency of this circuit is high, and the loss of switching devices is large, which will cause serious electromagnetic in...

AI Technical Summary

Problems solved by technology

However, the composition and function of the DC power supply device disclosed in the above-mentioned patent application is not perfect. Although the semi-switching power factor correction method used in it can solve the electromagnetic interference and switching loss caused by high-frequency power switching in the usual active power factor correction method It is a big problem, but there are still deficiencies, that is, in the existing semi-switching active power factor correction method, only the front part of the current pulse has a sinusoidal rising current, so that the current waveform is improved, but it is not ideal, and the power factor is not high enough. , and the harmonic emission cannot meet the certification requirements in many cases

Images