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Thyristor single-phase voltage adjusting circuit and control method thereof

A voltage regulation circuit and thyristor technology, which is applied in the control field to ensure stable triggering, cost reduction and small fluctuation range.

Inactive Publication Date: 2015-04-08
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to organically combine and innovate existing single-function unit circuits, overcome the shortcomings of the prior art, and provide a thyristor single-phase voltage regulating circuit with strong applicability and high cost performance; And provide a simple, real-time, accurate and stable control method with low cost

Method used

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  • Thyristor single-phase voltage adjusting circuit and control method thereof
  • Thyristor single-phase voltage adjusting circuit and control method thereof
  • Thyristor single-phase voltage adjusting circuit and control method thereof

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Embodiment 1

[0021] Embodiment 1: refer to figure 1 and figure 2 , a thyristor single-phase voltage regulating circuit of the present invention, comprising a main control circuit 40 electrically connected to a zero-crossing detection circuit 10, a thyristor trigger circuit 50 and a deviation judgment circuit 20, and the thyristor trigger circuit 50 is connected to a single It is electrically connected to the thyristor antiparallel circuit 30 . L in the zero-crossing detection circuit 10 is connected to the live wire of the power supply, and N is connected to the neutral wire of the power supply. When the positive half-wave of the power supply enters, the voltage of the L terminal is higher than the voltage of the N terminal, and the current flows from the L terminal through the resistor R1, then flows into the 2 pin of the photocoupler U1, and finally flows into the N terminal, thus , the light-emitting diode inside the optocoupler U1 emits light. When the light-emitting diode of photo...

Embodiment 2

[0029] Embodiment 2: refer to Figure 4 , a thyristor single-phase voltage regulating circuit voltage regulating circuit of embodiment 2 is basically the same as that of embodiment 1, the difference is: a thyristor 30 is installed between the fire line L and the deviation judgment circuit 20 A current detection circuit 60 is set, and a current transformer 601 collects an AC current signal on the live line L, and the obtained AC current signal is converted into a DC current signal through a rectifier bridge 602 . The DC current signal becomes a negative voltage signal through the resistor R1, and is filtered by the capacitor C and sent to the inverting amplifier composed of LM358, R1 and R2 for inverting amplification, and then connected to the deviation judgment circuit 20 through + and - of the voltage feedback + and - on for voltage feedback.

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Abstract

The invention relates to a thyristor single-phase voltage adjusting circuit and a control method thereof. The thyristor single-phase voltage adjusting circuit is characterized in that the arrangement of a transformer, a rectifier bridge and the like is omitted, and an alternating current bidirectional zero-crossing signal is directly detected by a photoelectric coupler, so the stability and accuracy of the voltage adjusting circuit are improved; deviation positive and negative signals required by a control algorithm are detected by an effective hardware circuit, and can be sent into a main controller in a digital way, so as to omit the conversion time of an analog to digital converter; the control algorithm adopts the phase-shift triggering, the movement direction of a triggering angle is directly determined according to the deviation positive and negative signals, and the control algorithm belongs to the closed-loop droop control; a thyristor triggering circuit of the voltage adjusting circuit can generate a strong triggering wide pulse signal, so as to guarantee the stable triggering of a thyristor. The voltage adjusting circuit and the control method have the advantages that the cost of hardware is greatly reduced, and the time is saved; the real-time property, accuracy and stability of the control system are improved, and the cost of the whole circuit is reduced.

Description

technical field [0001] The invention relates to the technical field of control, in particular to a thyristor single-phase voltage regulating circuit and a control method thereof. Background technique [0002] With the increase of industrial power consumption in my country, the conditions of terminal power supply lines are becoming more and more complex. The mains voltage near the distribution transformer is generally high, and the voltage fluctuates with the change of power supply load. Especially in most cases, the mains voltage If it is too high, it will cause the electrical equipment to be in the overload operation state, the energy consumption will increase, the reliability of the operation will decrease, the failure rate will increase, the user's electricity expenses will be increased, and the equipment maintenance cost will also increase. [0003] It is a more feasible way to adjust the voltage through the voltage regulating device on the user side to meet the power dem...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 周振雄孙继元曲永印苑广军郭丽
Owner BEIHUA UNIV
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