CN2101345U

CN2101345U - Passive suppressor for source current harmonic distortion

Info

Publication number: CN2101345U
Application number: CN 91215965
Authority: CN
Inventors: 边竞雄; 孔繁平; 袁庆
Original assignee: SHANGHAI ELECTRONIC COMPONENT FACTORY NO 2
Current assignee: SHANGHAI ELECTRONIC COMPONENT FACTORY NO 2
Priority date: 1991-10-04
Filing date: 1991-10-04
Publication date: 1992-04-08

Abstract

The utility model relates to a convertor capable of converting alternate current power input into direct current power output. The utility model is characterized in that a resonant loop is composed of an unbalanced inductor and a resonant capacitor; a rectifying and filter circuit is composed of a rectifying diode, a charge and discharge isolating diode and a filter capacitor; the convertor has the functions of rectification and filtering. The utility model has the advantages that the electric source input current harmonic distortion can be obviously ameliorated, the power factor can be improved, and the ballistic current for starting up can be decreased.

Description

Passive suppressor for source current harmonic distortion

The utility model relates to the converter between a kind of AC and DC, and particularly the AC power input changes the interchanger of direct current power output into.

Existing DC converter is by compositions such as conjugation inductor, rectifying tube, filtering capacitors, and two groups of coils of conjugation inductor wherein are balances.Because line voltage directly charges to filtering capacitor through rectifying tube, make converter be capacitive load, power factor descends, reduced power supplying efficiency, even more serious is that the power supply Harmonics of Input distortion factor is very big, still do not have dedicated devices at present and suppress, the result is that the current harmonics problem of dtmf distortion DTMF of Switching Power Supply is difficult to solve.

The purpose of this utility model provides a kind ofly to be had rectification and filter function, improve the source current total harmonic distortion, improves the passive type source current harmonic distortion inhibitor of power factor.

Task of the present utility model is achieved in that by unbalance inductor and resonant capacitor forms resonant tank, by rectifier diode, discharge and recharge isolating diode and filtering capacitor and form current rectifying and wave filtering circuit, unbalance inductor is made up of iron core and two uneven windings, its medium and small winding is made the ground connection isolator, have the conjugation filter action concurrently, high-frequency signal during to the switch power work suppresses, reduce its pollution to the urban network electricity source, big winding and resonant capacitor are formed series resonant tank, resonance frequency is the frequency multiplication place of supply frequency, can improve the power factor in urban network electricity source effectively, and can further suppress high-frequency interferencing signal, simultaneously, because the effect of big winding electric sensibility reciprocal is suppressed in the desired value start impulse current.Rectifier diode and filter capacitor are connected into the current rectifying and wave filtering circuit of series-fed, parallel discharge type, when the resonant tank of it and prime links, can suppress the distortion of power supply input current harmonics effectively.

Fig. 1 is the utility model circuit diagram

Fig. 2 is the utility model electric components layout plan

L among Fig. 1 ₁The big winding of-unbalance inductor, L ₂The little winding of-unbalance inductor, C ₁-resonant capacitor, C ₂, C ₃-filtering capacitor, D ₁, D ₂, D ₃, D ₄-rectifier diode, D ₅, D ₆, D ₇-discharge and recharge isolating diode

The unbalance inductor L of 1-among Fig. 2,2-resonant capacitor C ₁, 3-rectification and discharge and recharge isolating diode D ₁, D ₂, D ₃, D ₄, D ₅, D ₆, D ₇, 4-filtering capacitor C ₂, C ₃

Now in conjunction with the accompanying drawings the utility model is further described.

The utility model is linked by resonant tank and current rectifying and wave filtering circuit and forms.By unbalance inductor L and resonant capacitor C ₁The interference that composition prime resonant tank is used between electrical network and the circuit network is isolated, and unbalance inductor is made up of iron core and two unbalanced windings, as an embodiment, and big winding L ₁Inductance value be 500 milihenries, the inductance value L of little winding ₂Be 2 milihenries, resonant capacitor C correspondingly ₁Capacitance be 0.68 microfarad.By rectification two D ₁, D ₂, D ₃, D ₄With discharge and recharge isolating diode D ₅, D ₆, D ₇With filtering capacitor C ₂, C ₃Form back level current rectifying and wave filtering circuit, adopt series-fed, parallel discharge form, filtering capacitor C ₂, C ₃Input is series connection to power supply, and load end then is parallel discharge form, D in the present embodiment ₁, D ₂, D ₃, D ₄, D ₅, D ₆, D ₇Be 1N4007, C ₂, C ₃Be 100 microfarads.

The utlity model has rectification, filter function, advantage is that the distortion of power supply Harmonics of Input obviously improves.Power factor improves, and in the above-described embodiments, when supply frequency is 60 He Zhi, bearing power is 80 watt-hours, and the current harmonics distortion factor is less than 10%, and power factor is greater than 0.98, and the start impulse current is less than 10 peaces.

Claims

1, a kind of passive type source current harmonic distortion inhibitor comprises resonant tank, current rectifying and wave filtering circuit, it is characterized in that:

A, resonant tank are by unbalance inductor L and resonant capacitor C ₁Form;

B, unbalance inductor L are by iron core and two uneven winding L ₂, L ₂Form;

C, current rectifying and wave filtering circuit are by rectifier diode D ₁, D ₂, D ₃, D ₄With discharge and recharge isolating diode D ₅, D ₆, D ₇With filtering capacitor C ₂, C ₃Form, connecting mode adopts series-fed, parallel discharge form.