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Relay failure safety circuit

A relay failure and safety circuit technology, which is applied in the direction of instruments, simulators, computer control, etc., can solve the problems that the safety output cannot be cut off, and the simultaneous adhesion of contacts cannot be solved, so as to achieve the effect of improving safety and flexible configuration

Active Publication Date: 2015-02-04
TRAFFIC CONTROL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the system cannot solve the situation that contacts K02-3 and K03-3 are stuck together at the same time, and the safety output cannot be cut off at this time

Method used

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Examples

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Embodiment Construction

[0038] The present invention will be described in detail below with reference to the drawings and embodiments.

[0039] Such as image 3 As shown, this embodiment records a relay fail-safe circuit, including a relay connected across both ends of the safe input voltage terminal:

[0040] The first relay branch includes a first relay K1, a second relay normally closed contact K2-1, a third relay normally closed contact K3-1, and a fourth relay normally closed contact connected in series on the first relay branch Point K4-1, and the diode and capacitor connected in parallel with the first relay K1, so that the first relay K1 is delayed and released;

[0041] The second relay branch includes a second relay K2 connected in series on the second relay branch and a second relay self-series normally open contact K2-2, and the second relay self-series normally open contact K2-2 A first normally open contact K1-1 of the first relay connected in parallel, and a diode connected in parallel with...

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Abstract

The invention discloses a relay failure safety circuit which comprises a first relay branch circuit and at least three other relay branch circuits, and the first relay branch circuit is connected at two ends of safety input voltage in a bridge joint mode. The first relay branch circuit is in serial connection with a first relay, each other relay branch circuit is in serial connection with one other relay, and each other relay is provided with a normally-closed contact, a self-serial-connection normally-open contact and at least one loop normally-open contact. The normally-closed contact is in series connection with the first relay, the self-serial-connection normally-open contact is in series connection with self, and at least one loop normally-open contact is in series connection with a safety output loop. The first relay is provided with a normally-open contact which is in parallel connection with the self-serial-connection normally-open contact of each other relay, and at leas one loop normally-closed contact which is in series connection with the safety output loop. Even if contacts of two relays of the circuit simultaneously are adhered, a system can ensure circuit safety.

Description

Technical field [0001] The present invention relates to the technical field of safety circuits, in particular to a relay fail-safe circuit. Background technique [0002] In the safety-related control fields such as train operation control and signal control, there are higher requirements for the safety and reliability of the control system, and the use of relay control circuits is the most common and common. This puts forward higher requirements for the safety and reliability of the relay. [0003] Relays are generally divided into electromagnetic relays, thermal reed relays, and solid state relays. Thermal reed relays and solid state relays are not safety devices. Electromagnetic relays can be made into safety relays. The use of safety relays can improve the safety of the output circuit. And reliability. [0004] In safety output circuits, using safety relays to drive external circuits is one of the more common methods. The so-called "safety relay" is not a "fault-free relay", bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/048
Inventor 陈寅昊
Owner TRAFFIC CONTROL TECH CO LTD
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