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

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

Examples

Experimental program
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Example Embodiment

[0021] Example 1: Reference figure 1 and figure 2 , A thyristor single-phase voltage regulation circuit of the present invention includes a main control circuit 40 that is electrically connected to the zero-crossing detection circuit 10, the thyristor trigger circuit 50 and the deviation judgment circuit 20, respectively, and the thyristor trigger circuit 50 is connected to the single-phase voltage regulator. It is electrically connected to the thyristor anti-parallel 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, the current flows from the L terminal through the resistor R1 and then flows into the 2 pin through the 1 pin of the optocoupler U1, and finally flows into the N terminal. , the light-emitting diode inside the photo...

Example Embodiment

[0029] Example 2: Reference Figure 4 , the voltage regulating circuit of a thyristor single-phase voltage regulating circuit in Embodiment 2 is basically the same as that in Embodiment 1, and the difference is: an additional circuit is installed between the live wire L where the thyristor 30 is located and the deviation judgment circuit 20. The current detection circuit 60 is set, and the current transformer 601 collects the AC current signal on the live wire L, and the obtained AC current signal is then converted into a DC current signal through the 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 inversion amplification, and then connected to the deviation judgment circuit 20 through the + and - of the voltage feedback. + and - on the 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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