Circuit and method for eliminating current distortion caused by inductive reactance in lines

Abstract

The invention provides a circuit and a method for eliminating current distortion caused by inductive reactance in lines. The circuit comprises a main circuit needing to avoid distortion, and a switch is serially connected onto the main circuit; a plurality of bypasses are connected to two ends of the main circuit in parallel, each bypass is provided with a switch, and switch-on time and switch-off time of each switch can be precisely controlled; and line resistance of the bypasses is sequentially reduced from the first bypass, and the resistance of the last bypass is equal to resistance of the main circuit. The method includes closing the first bypass at first when expected sudden current change occurs; closing the second bypass and simultaneously opening the first bypass; and sequentially performing the procedure for the rest bypasses except for the last bypass, then closing the main circuit and opening the last bypass so that undistorted current flows through the main circuit. The circuit and the method have the advantages that the problem of distortion of the expected suddenly changing current due to the inductive reactance in the lines can be solved, the price is low as compared with an AC-DC-AC scheme, the quantity of adopted components is low, the reliability is obviously improved, and the circuit and the method have an extremely high economical benefit and extremely high practical value.

Description

technical field [0001] The invention relates to a circuit for eliminating current distortion due to inductive reactance in a line. Background technique [0002] Inductance is a characteristic that exists in AC lines. This characteristic exists not only because of the presence of inductive components (such as transformers, reactors, motors, etc.) in the line, but also inductance in lines composed of pure wires. This is because the load The current wire is always closed, and the current needs to flow from one pole to the other. The larger the area surrounded by the current-carrying line, the greater the flux linkage Ψ generated by it, and the greater the inductance. A wire is always part of the self-inductance. Generally speaking, the inductance of the self-inductance part of a straight line circuit can be written as follows: [0003] L=2×l×(ln(4l / d)-0.75)×10-7 [0004] Among them, l is the length of the wire in the circuit, and d is the diameter of the wire. [0005] It ca...

AI Technical Summary

Problems solved by technology

[0015] 2. The impact caused by Ipk will cause damage to the circuit or some precision instruments in the circuit

[0017] The AC-DC-AC rectification plus inverter technology, that is, the "AC-DC-AC" method often said in engineering, has very obvious effects, but this technology requires very complicated circuits and components, and its equipment is very expensive

Images