Power adjuster for three-phase voltage/power adjustment

Abstract

The invention discloses a power adjuster for three-phase voltage / power adjustment. The power adjuster comprises a singlechip microcomputer, a phase-locked loop circuit unit, a first current transformation unit, a second current transformation unit, an optical isolation circuit unit, a load control unit and an input signal control unit, wherein the phase-locked loop circuit unit comprises an exclusive-OR gate phase comparator, a voltage-controlled oscillator and a frequency divider; the frequency divider outputs signals to the singlechip microcomputer unit; the first current transformation unit sends voltage input signals obtained from the input signal control unit to the singlechip microcomputer unit; the second current transformation unit sends feedback signals output by the load control unit to the singlechip microcomputer; the optical isolation circuit unit sends synchronous signals generated by a three-phase power supply to the singlechip microcomputer and the load control unit for connection; the load control unit receives width-variable trigger pulses of the optical isolation circuit unit; and the input signal control unit is connected with the first current transformation unit and the singlechip microcomputer. The power adjuster disclosed by the invention has the advantages of reducing the asymmetry of output current, minimizing direct-current components and ensuring that the sensitive load of a transformer is triggered reliably.

Description

technical field [0001] The invention relates to a power regulating device, in particular to a power regulator for three-phase voltage regulation / power regulation for transformer loads. Background technique [0002] In the market, the temperature control of a system is achieved by using a three-phase power regulating / voltage regulating device to control the power of the electric heater, which is an indispensable equipment in the industry. The impedance of the electric heater used in some industrial fields does not match the industrial frequency power supply, so it is necessary to set an impedance matching transformer between the two to become a transformer load. We know that once the transformer load enters the magnetic saturation state, it is like a short circuit of the load, which will damage the main circuit components. In order to avoid this situation, it is required that the DC component of the output current of the power regulating / voltage regulating device be as small...

AI Technical Summary

Problems solved by technology

In order to avoid this situation, it is required that the DC component of the current output by the power regulation / voltage regulation device be as small as possible. At present, domestic power regulation / voltage regulation devices have done a lot of research on preventing the transformer load from entering the magnetic saturation state, but No good solution found yet

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