DH7J1

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The DH7J1 input filter is a type of harmonic amplification filtering device used to eliminate interference between thyristor and other rectifier components in the power system. It is often referred to as an international general harmonic filter. It can be used in wiring such as three-phase four-wire systems and two-phase asymmetric systems. The structure of the DH7J1 filter is a series three-phase filter composed of two parts of reactor coils and capacitors. The reactor coils and capacitors are connected in series in the positive line of the input side of the filter. The filter can adjust the input current of the thyristor and reduce the interference of the output current of the thyristor.

The working principle of DH7J1 filter is very simple. It is to minimize the electromagnetic emission of the power source by using a series of capacitance and inductance circuits connected on the input side. In the single harmonic filtering process, the resonance frequency produced by the combination of the inductance and capacitance of the filter is adjusted to the harmonic frequency of the input current. In this way, when the harmonic element of the current flows into the filter, it can be limited before it enters the thyristor, thereby reducing the interference on the secondary side of the thyristor and improving the electromagnetic compatibility of the system.

DH7J1 filters can be applied in a variety of different engineering fields. For example, it can be used to solve the harmonic pollution problem of medium-voltage current including low-harmonic current. It is mainly used in rectifier bridges and motor drives. In addition, it can also be used in the process of computer systems, variable speed drives, telecommunications, laser systems, power conditioning and so on. Due to its wide variety of applications, it has become an important part of different industries for the suppression and elimination of electromagnetic interference.

Therefore, the DH7J1 filter can be used in a variety of engineering fields. The application of the filter helps to reduce harmonic pollution and improves the electromagnetic compatibility of the system. The working principle of the DH7J1 filter is to adjust the resonance frequency to the harmonic frequency of the input current, thus limiting the interference caused by the harmonic on the secondary side of the current.

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