Turn-off circuit, drive circuit, igct, electrical device and turn-off method

By adjusting the PN junction voltage between the control electrode and the first lead in the IGCT turn-off circuit, the problem of balancing reliability and safety during IGCT turn-off is solved, achieving higher device turn-off reliability and PN junction safety.

CN120110367BActive Publication Date: 2026-06-02TSINGHUA UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TSINGHUA UNIVERSITY
Filing Date
2025-04-25
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In related technologies, it is difficult to simultaneously ensure the reliability of turn-off of integrated gate commutated thyristors (IGCT) and the safety of the PN junction between the control electrode and the first lead.

Method used

A shutdown circuit is provided, including a control device and a voltage regulation circuit. By controlling the on, off, or clamping of a voltage-adjustable switching element at a predetermined voltage, the PN junction voltage between the control electrode and the first lead of the GCT is adjusted to ensure that the PN junction is under appropriate reverse bias voltage under different states.

Benefits of technology

This improves the reliability of IGCT turn-off and the safety of the PN junction between the control electrode and the first lead, solving the problem of balancing reliability and safety during turn-off.

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Abstract

This disclosure provides a turn-off circuit, a drive circuit, an IGCT, an electrical device, and a turn-off method. The turn-off circuit is used for a gate-commutated thyristor, which includes a first lead, a second lead, and a control lead. The turn-off circuit includes a control device and a voltage regulation circuit. The control device is configured to output a control signal to the voltage regulation circuit. The voltage regulation circuit includes a control sub-circuit, a voltage-adjustable switching element, and a voltage source. A first terminal of the voltage-adjustable switching element is electrically connected to the control lead of the gate-commutated thyristor, a second terminal of the voltage-adjustable switching element is electrically connected to a first terminal of the voltage source, the control lead of the voltage-adjustable switching element is electrically connected to the control sub-circuit, and the second terminal of the voltage source is electrically connected to the first lead of the gate-commutated thyristor. The control sub-circuit is configured to control the voltage-adjustable switching element to be turned on or off, or to control the voltage-adjustable switching element to be clamped at a predetermined voltage, based on the control signal.
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