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Protective circuit for thyristor bridge connected with power source

A technology for protecting circuits and thyristors, applied in circuits, electrical components, electrical solid devices, etc., can solve problems such as inability to protect thyristors, and achieve the effect of avoiding high costs and avoiding operating failures

Inactive Publication Date: 2006-03-29
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, in the "thyratron V6 - thyratron V3 - indirect loop capacitance C zk "There is no choke coil L in the circuit formed by ZK , the current rise can only be limited by the wire inductance of the indirect loop
Since the value of the wire inductance is usually small, the current rises very quickly, making the fuse F in the indirect loop ZK Or the fuse connected in series with the thyratron cannot protect the thyratron

Method used

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  • Protective circuit for thyristor bridge connected with power source
  • Protective circuit for thyristor bridge connected with power source
  • Protective circuit for thyristor bridge connected with power source

Examples

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Embodiment Construction

[0032]Fig. 2 shows a protection circuit SCH according to the invention, which is connected to the thyristor bridge B, B' (see the description of Fig. 1 above) connected to the power grid and an indirect loop or with an indirect loop capacitance C ZK and between the load circuit of the load LAS. The series branch of the protection circuit is composed of IGBT transistor GT1 and a diode connected in parallel with its conduction direction oppositely, that is, the so-called anti-parallel diode D1. Usually, the diode D1 and the transistor GT1 are integrated in one housing.

[0033] The control circuit AST is used to control the triode GT1. In this example, the thyristor control circuit THS sends out a reversal identification signal s K , the flip identification signal is introduced into the control circuit AST. In addition, as shown in Figure 2, the voltage U between the collector and the emitter of the triode GT1 s1 Access control circuit AST.

[0034] During work, the triode ...

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Abstract

A protective circuit (SCH) for a line-commutated thyristor bridge (B, B'), which is designed for feeding energy of a power circuit connected to the bridge and also for feedback from this circuit, and which is connected between the thyristor bridge and the power circuit. In a series branch of the protective circuit, there is at least one IGBT transistor (GT1, GT2), which is biased in the feedback direction with an inverse-parallel diode (D1, D2; D1p), and which can be deactivated for the appearance of a tipping recognition signal (sk, Us1), which is supplied by a control circuit (AST) associated with the transistor.

Description

technical field [0001] The invention relates to a protection circuit for a thyristor bridge connected to a power supply, which circuit is used to supply energy to and obtain feedback from an energy circuit connected to it, which circuit is connected to a thyristor circuit Between the bridge and the energy loop. Background technique [0002] In many cases, the thyristor bridge used for energy feedback in the three-phase AC grid is connected in antiparallel with a supply bridge that converts the three-phase voltage in the three-phase grid to the inverter required for the inverter Indirect loop DC voltage (Zwischenkreis-Gleichspannung), inverter for powering the three-phase motor. For example, when motor braking is required, the energy in the indirect loop will be fed back into the three-phase grid through the feedback bridge. The invention concerns the use of a thyristor bridge in the same way to transfer energy from a DC grid, for example of a photovoltaic installation or t...

Claims

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Application Information

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IPC IPC(8): H02M1/00H02M7/757H02M1/32
CPCH02M7/757H02M1/32H01L2924/0002H01L2924/00
Inventor 威廉·雷斯彻李奥·卡尔海恩兹·皮科纳弗朗兹·沃莱尔
Owner SIEMENS AG