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Switching circuit and method for controlling circuit breaker

A technology for switching circuits and circuit breakers, which is applied in the application field of controlling at least one circuit breaker, inductive load, and switching device, and can solve problems such as high overvoltage and circuit breaker damage

Inactive Publication Date: 2008-06-11
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the current is cut off quickly at this time, it will cause a high overvoltage, which will damage the circuit breaker

Method used

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  • Switching circuit and method for controlling circuit breaker

Examples

Experimental program
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Embodiment Construction

[0028] The same components are denoted by the same reference symbols in the various figures.

[0029] The embodiment shown in Figure 1 exemplarily shows an inductive load X L . Among them, through two anti-series circuit breakers, in the form of MOS field effect transistors (MOSFET) M1 and M2 shown in the figure, the flow through this inductive load X L The current is switched on and off. Inductive loadX L It is connected with the ground line GND, and the MOSFET M1 is connected with the phase line OC. If there are multiple (for example, three) phase lines OC, three switching circuits to be described below can be used to make each current flow from the phase line OC through the inductive load X L Connect to ground GND. In this example, the flow through the inductive load X L The current of the current is alternating current (AC power supply), so by connecting two MOSFETs M1 and M2 in reverse series, the current can be controlled or cut off in both current directions of th...

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PUM

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Abstract

The invention relates to a switching circuit comprising at least one circuit-breaker (M1, M2) for switching a load (XL), a resistor (RL), a thyristor (Th) or a triac (TR), and means (R1, Di, V3) for igniting the thyristor (Th) or the triac (TR) in accordance with a voltage that drops above the circuit-breaker (M1, M2). The resistor (RL) and the thyristor (Th) or triac (TR) are interconnected so as to short-circuit the at least one circuit-breaker (M1, M2).

Description

technical field [0001] The invention relates to a switching circuit, in particular to the application of the switching circuit in a switching device of a low-voltage equipment. Furthermore, the invention relates to a method for controlling at least one circuit breaker for switching a load, in particular an inductive load. Background technique [0002] An ideal switching device in a low-voltage installation is one that, in addition to its normal switching function, also breaks a short circuit in the case of a circuit breaker. Since a short circuit can occur at any time and needs to be limited and / or opened as soon as possible, the next time the current crosses zero, the short circuit cannot be effectively opened without pre-limiting measures. To be precise, at least one current limitation must be performed directly. [0003] In mechanical switching devices, a countervoltage with a current-limiting effect is generally generated by the switching arc. With a corresponding des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
CPCH02H9/047
Inventor 克里斯琴·奥珀曼于尔根·鲁普
Owner SIEMENS AG