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Thyristor AC-AC frequency converter complete shut-down detection circuit

An AC frequency conversion and detection circuit technology, applied in the field of full shutdown detection circuit, can solve the problems of large load influence, not fast enough, no circulating current dead time, etc.

Inactive Publication Date: 2008-07-02
BEIJING ARITIME INTELLIGENT CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former method is not fast enough, resulting in too long a loop dead time, which has a great impact on the load

Method used

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  • Thyristor AC-AC frequency converter complete shut-down detection circuit
  • Thyristor AC-AC frequency converter complete shut-down detection circuit

Examples

Experimental program
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Effect test

Embodiment Construction

[0013] The voltage detection circuits required by the six converter bridge arms of each phase are designed on two circuit boards according to high and low voltage isolation, and other logic circuits are designed on the circuit boards of the low voltage part.

[0014] The voltage taken from both ends of the thyristor is input to the circuit board of the high voltage part. R1 and R2 in the power supply circuit act as a voltage divider, and the rectifier bridge composed of D1~D4 converts the alternating current from both ends of the thyristor into direct current, and R3 provides a current path for the voltage. Then the DC voltage is sent to the voltage-stabilizing energy storage circuit, and the voltage-stabilizing energy storage circuit outputs a stable DC voltage. Under normal working conditions, when the thyristor is blocked, there is a high voltage at its two ends, and a higher DC voltage can be obtained after rectification. At this time, D5 and Q1 in the voltage stabilizing ...

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PUM

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Abstract

An all-turn off detection circuit for a thyristor in a cycloconverter system, belongs to the technology of thyristor conversion, and consists of a voltage detection circuit and a logic judgment circuit; wherein, the input of a voltage detection circuit is the terminal voltage of the thyristor, an output signal is transmitted to a logic judgment circuit which outputs an all-turn off detection signal. Detection of voltage at the two terminals of the thyristor is realized through the voltage detection circuit. The logic judgment circuit makes logic judgment by utilizing a trigger signal and a voltage detection signal, providing an on-off signal of the thyristor. The utility model has the advantages of rapidly and precisely providing the zero current information of a main circuit, greatly shortening the dead time of zero current in the shift between positive and negative groups, reducing the negative impact on motor load.

Description

[0001] The invention belongs to the technical field of thyristors in frequency conversion systems, and in particular provides a full-shutdown detection circuit for thyristor AC / AC converters. For AC frequency conversion based on logic without circulating current. Background technique: [0002] AC and AC frequency conversion systems are divided into two categories: circulating current and non-circulating current. In order to prevent power short-circuit accidents, logic non-circulating current control is generally adopted. There will be a period of no-circulation dead time when the positive and negative groups of a main circuit bridge in the AC-AC frequency conversion system based on logic non-circulating current control are handed over. In order to reduce the impact of this dead time on the motor load, the dead time should be as small as possible. , in order to do this, the zero current signal in the main circuit must be detected timely and accurately. This circuit design is u...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R17/00
Inventor 李崇坚李向欣朱春毅何山
Owner BEIJING ARITIME INTELLIGENT CONTROL
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