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

A technology of DC power supply and DC output terminal, applied in the field of power supply, can solve the problems of imperfect composition and function of DC power supply device, failure of harmonic emission to meet certification requirements, unsatisfactory current waveform, etc., and achieve perfect power factor correction function, sine degree High, high power factor effect

Active Publication Date: 2007-12-12
GREE ELECTRIC APPLIANCES INC +1
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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

Method used

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

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Embodiment Construction

[0020] Figure 1 shows a DC power supply device suitable for air-conditioning compressors. The DC power supply device includes an AC power supply Vin, a rectification circuit for rectifying the AC output from the AC power supply, a filter capacitor E1 connected to the DC output end of the rectification circuit, and a connection The reactor L between the AC power supply Vin and the AC input terminal of the rectifier circuit, the short-circuit circuit for forcing the AC power supply to energize the reactor, the zero-crossing detection link for detecting the frequency of the AC power supply and the zero-crossing point of the AC power supply voltage, and the AC current The detection link, the gate drive link, the Vdc detection link for detecting the voltage value of the DC output terminal of the rectifier circuit, the voltage divider network of the above Vdc detection link and the filter capacitor E1 are connected in parallel and connected to the zero-crossing detection link, the gat...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M3/22
CPCY02B70/126Y02B70/10
Inventor 张有林许敏米雪涛梁博
Owner GREE ELECTRIC APPLIANCES INC
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