CN202872741U - Odd harmonic filter - Google Patents

Abstract

The present utility model discloses an odd harmonic filter. The filter main body is composed of multiple groups of closed circuit magnet ring irons cores made of ultra-micro crystals, brass wire windings are preferably adopted in each group of iron cores, two ends of the iron cores of each group are successively and correspondingly connected with a resonant capacitor, a resistor or a switch is connected in series between each group of iron cores and the capacitor, and each iron core is provided with a slit. The ultra-micro crystal materials are adopted, the magnetic conductibility is high, the magnetic saturation phenomenon is not easy to occur, reliable filtering of low band can be realized, no new harmonic wave will be generated to influence a circuit, and the capacitor can normally operate.

Description

The odd harmonic filter

Technical field

The utility model relates to a kind of filter, refers in particular to a kind of low-pressure reactive compensation odd harmonic filter that is exclusively used in.

Background technology

In the power electronics load circuit, generally adopt basic filter, the high order harmonic component under certain frequency range is carried out banded filtering.But this device only limits to use in the high band at low current.For low-frequency range, as 100HZ, 200HZ, symmetric harmonic and the 150HZ such as 300HZ, 250HZ, the odd harmonics such as 350HZ, Nonlinear Load in Power Network in use can produce high order harmonic component, and electrical network is polluted.And when load when not being very large, when for example load was 20 Ω or 10 Ω, impedance and the load of secondary filtering were suitable, and so, the consumption of filter is just too large, has not just possessed use value.And in reactive compensation system, form easily overvoltage when capacitor drops into, and produce high power to shove, make that capacitor is breakdown, short circuit even blast etc.In existing reactive power compensation technology, usually adopt reactor to suppress harmonic wave, but in fact reactor can only have effect to low-order harmonic, can not suppress high order harmonic component, the magnetic saturation phenomenon can occur on the contrary, even set off an explosion.Also there are in the market some traditional filters to connect by circuit, produce again new harmonic wave, therefore, how so that load＞electrical equipment during 1 Ω is to the reliable filtering of low-frequency range, and don't produce new harmonic source and affect circuit and become difficult point.。

Summary of the invention

Task of the present utility model is to overcome the defective that above-mentioned prior art exists, and a kind of odd harmonic filter is provided.It is simple in structure, can carry out reliable filtering to low-frequency range, and don't produce new harmonic source, affects circuit.

For finishing above-mentioned task, the scheme that the utility model is taked is: a kind of odd harmonic filter, the many groups of closed circuit magnet ring iron cores that filter main body is made by ultramicro-crystal form, but every group iron core preferably copper filament winding group, every group iron core two ends are the corresponding resonant capacitance that connects successively, and series resistor or switch between every group of iron core and the electric capacity, iron core is with the slit.

The beneficial effects of the utility model: used the ultramicro-crystal material; it has the high advantage of permeability, is not easy to produce the magnetic saturation phenomenon, and this filter can carry out reliable filtering to low-frequency range simultaneously; not producing new harmonic source affects circuit, can normally move by capacitor for voltage protection again.

Description of drawings

Below in conjunction with drawings and Examples structure of the present utility model is further described.

Fig. 1 is circuit connection diagram of the present utility model.

Embodiment

The many groups of closed circuit magnet ring iron cores that filter main body is made by ultramicro-crystal form, but every group iron core preferably copper filament winding group, every group iron core two ends are corresponding successively to connect resonant capacitance, and series resistor or switch between every group of iron core and the electric capacity, and iron core is with the slit.Power lead is connected L one end of the present utility model, the other end of L is connected in load, this has just formed magnetic coupling linear transformer secondary resonance.When electric current during through the utility model low frequency symmetric harmonic and odd harmonic inhibitor, produce induced field, solved that low frequency filtering LC can compare with load impedance and so that the very large problem of loss under first-harmonic.Iron core band slit can make electric current through out-of-date, and the B linearity is unsaturated, when guaranteeing that former limit I changes, and L2, the data stabilizations such as L3 are guaranteed corresponding electric capacity resonance under corresponding frequency.Occur in might certain minor loop in the situation of large electric current, the resistance R 1 of can connecting between other groups such as L1 and C1 according to circumstances is with the reduction electric current; Sometimes also can need because of control tandem tap K between every group of L1 and C1 etc.

Analyze through testing instruments Agilent6843, very obvious for the inhibitor effect of second harmonic.

Claims (2)

1. odd harmonic filter, it is characterized in that: the many groups of closed circuit magnet ring iron cores that filter main body is made by ultramicro-crystal form, every group iron core is selected the copper wire winding, and every group iron core two ends are corresponding successively to connect resonant capacitance, and series resistor or switch between every group of iron core and the electric capacity.

2. a kind of odd harmonic filter according to claim 1 is characterized in that iron core is with the slit.

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