Detection circuit for triggering and complete shutting down of thyristor current transformer

A detection circuit and trigger circuit technology, which is applied in the frequency conversion field of thyristors, can solve the problems of board making and inconvenient use, and achieve the effect of facilitating installation and simplifying the circuit structure

CN101207325AInactive Publication Date: 2008-06-25BEIJING ARITIME INTELLIGENT CONTROL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2008-06-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a trigger and fully-shutoff detection circuit of a thyristor inverter, which belongs to the converter technique of the thyristor. The circuit comprises a self-supplied power-source circuit, a trigger circuit and a fully-shutoff detection circuit, wherein, the self-supplied power-source circuit supplies power for the trigger circuit and the fully-shutoff detection circuit, the output of the trigger circuit is directly connected to the trigger end of the thyristor, and the voltage detection signal of the fully-shutoff detection circuit is transmitted to a control system through an optical fiber. The invention has the advantages that the power-supply self-support of the entire circuit board can be realized without a special power source; the trigger circuit can be free from a pulse transformer, thereby simplifying the circuit structure; the circuit integrates the trigger and the fully-shutoff of the thyristor, thereby favoring the installation of the equipments and the exercise of the engineering. The invention is applicable to an AC-AC frequency-conversion system and a reversible DC speed-modulation system of the thyristor.
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Description

technical field

[0001] The invention belongs to the technical field of frequency conversion of thyristors, and in particular provides a trigger and full shutdown detection circuit of a thyristor converter. 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 used to meet this need. This circuit can be used in AC-AC...

Examples

Embodiment Construction

[0025] This circuit is designed on a circuit board. A circuit board is arranged next to each thyristor, and each board is connected to the circuit board corresponding to the thyristor connected in antiparallel through the resistance and capacitance in the resistance-capacitance absorption line of the thyristor.

[0026] The input voltage of the self-contained power supply circuit is the thyristor terminal voltage. When the circuit works stably, in the rising stage of the input voltage, the current is charged to the energy storage capacitor C1 by D2, and the voltage regulator D3 ensures that the voltage at both ends of C1 will not be too high. During the falling phase of the input voltage, current flows out of D1. In addition, C1 also has the function of filtering, and the output voltage at both ends is a stable DC voltage, which can be directly used as the power supply of the trigger circuit. When it is used as the power supply of integrated devices, the voltage needs to be re...