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Relay circuit

A technology for relays and monitoring circuits, used in relays, circuits, circuit devices, etc.

Inactive Publication Date: 2014-03-12
SCHNEIDER ELECTRIC AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the event of a brief voltage interruption, it can happen that one of these relays releases, while the other remains closed, so that the circuit must be switched manually to a basic state

Method used

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Examples

Experimental program
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Embodiment Construction

[0025] figure 1 The schematic diagram showing the series connection of relay K1 and relay K2. In this exemplary embodiment, it is assumed that both relays K1 , K2 have the same minimum holding voltage UHalt,min1=UHalt,min2. Furthermore, the relay K1 has a coil resistance Rsp1 and the relay K2 has a coil resistance Rsp2, which in this embodiment corresponds to twice the coil resistance Rsp1, so Rsp2=2×Rsp1.

[0026] On the premise that a current I flows through the two relay coils K1 and K2, the voltage drop on the relay K1 is UK1=IxRsp1, and the voltage drop on the relay K2 is UK2=Ix2xRsp1=2xUK1. If V1=50%, then:

[0027] V1=UHalt, min1 / UK1=50%>>V2=UHalt, min2 / UK2= 1 / 2 UHalt, min1 / UK1=25%.

[0028] As a result, relay K1 is the first to release in the event of a disturbance of the supply voltage UV because V1 >> V2.

[0029] figure 2 Indicates that the supply voltage UV decreases with time t. In addition, the voltage drops UK1 and UK2 across the relay coils are shown...

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Abstract

A relay connection with at least two relays (K1, K2) connected in series or in parallel to a supply voltage (UV). In order to achieve a defined relay cut-out sequence should there be a dip in the supply voltage and consequently to increase safety, it is provided that the relays (K1, K2) have different minimum holding voltages (UHalt,min1; UHalt,min2) and / or inductive resistances (Rsp1; Rsp2).

Description

technical field [0001] The invention relates to a relay circuit with at least two relays connected in series or in parallel to a supply voltage. The invention also relates to a monitoring circuit for monitoring at least one signal input, such as an emergency signal, with at least two relays connected in series or in parallel to the supply voltage, which relays can be controlled according to a signal applied to the at least one signal input , to activate or deactivate it. Background technique [0002] DE-A-197 15 098 and DE-A-197 15 013 both describe monitoring circuits of the above-mentioned type. [0003] In both cases it is a safety and / or monitoring circuit, which is used to ensure the safety of machines with several signal inputs which are constantly monitored and to shut down the machine in the event of a power failure. The safety and / or monitoring circuit comprises at least two relays, the latter being controllable and energizable by the safety and / or monitoring circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H47/00G05B9/02
CPCH01H47/004H02H3/021H02H3/033H02H3/24
Inventor R·沃德尼奥克
Owner SCHNEIDER ELECTRIC AUTOMATION