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Security input isolating circuit and track circuit receiver provided with same

A technology of safety input and isolation circuit, applied in the direction of railway signal and safety, DC coupled DC amplifier, railway signal, etc.

Active Publication Date: 2013-02-06
BEIJING RAILWAY SIGNAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of this, the object of the present invention is to provide a safety input isolation circuit and a track circuit receiver having the circuit, to solve the potential safety problem that the safety input isolation circuit adopts two operational amplifiers of the same type in the prior art

Method used

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  • Security input isolating circuit and track circuit receiver provided with same
  • Security input isolating circuit and track circuit receiver provided with same
  • Security input isolating circuit and track circuit receiver provided with same

Examples

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Embodiment 1

[0039] Embodiment 1 discloses a safety input isolation circuit, refer to the attached figure 2 , the safety input isolation circuit includes: two first operational amplifiers 201 and second operational amplifiers 202 with different structures;

[0040] Wherein, the first operational amplifier 201 and the second operational amplifier 202 are connected in parallel through their respective input terminals.

[0041] In this embodiment, the two operational amplifiers may be operational amplifiers of one functional type but different models or any combination of operational amplifiers of two functional types. Operational amplifiers can be divided into general-purpose operational amplifiers, high-resistance operational amplifiers, low-temperature floating operational amplifiers, high-speed operational amplifiers, low-power operational amplifiers, and high-voltage high-power operational amplifiers according to their functional types. The choice of op amp is based on specific user re...

Embodiment 2

[0044] The second embodiment is a detailed description of the case where the first operational amplifier and the second operational amplifier described in the first embodiment use two functional types of operational amplifiers.

[0045] Reference attached image 3 , the safety input isolation circuit specifically includes, attached figure 2 The first operational amplifier 201 shown in is a general-purpose operational amplifier LM148, with figure 2 The second operational amplifier 202 shown in is a cryogenic drift operational amplifier OP400.

[0046] Among them, the operational amplifier LM148 and the operational amplifier OP400 are connected in parallel through their respective input terminals, and the input terminals of the operational amplifier LM148 are respectively linked with the input signals 1, 2, 3 and 4 through their pins 3, 5, 10 and 12; the operational amplifier OP400 The input terminals of the 2.0 are linked with the input signals 1, 2, 3, and 4 through their ...

Embodiment 3

[0050] The third embodiment is a detailed description of the case where the first operational amplifier and the second operational amplifier described in the first embodiment use the same functional type of operational amplifier.

[0051] Reference attached Figure 4 , including, specifically figure 2 The first operational amplifier 201 shown in is a high-impedance operational amplifier CA3130, attached figure 2 The second operational amplifier 202 shown in is a high-impedance operational amplifier CA3140.

[0052] Among them, the operational amplifier CA3130 and the operational amplifier CA3140 are connected in parallel through their respective input terminals, and the input terminals of the operational amplifier CA3130 are respectively connected to the input signals 1, 2, 3, and 4 through their pins 3, 5, 10, and 12; the operational amplifier CA3140 The input terminals of the 2.0 are linked with the input signals 1, 2, 3, and 4 through their pins 3, 5, 10, and 12, respec...

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PUM

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Abstract

The invention discloses a security input isolating circuit in a track circuit receiver in railway signal system. Two operational amplifiers with different structures are adopted to perform impedance conversion and interstage isolation on a frequency-shift signal. With adoption of the security input isolating circuit, the probability of happening CCF (Common Cause Failure) in the input isolating circuit is lowered, thereby improving the security and the reliability of circuit equipment and satisfying the requirement of a railway ministry to the failure safety of railway signal equipment. In addition, the operational amplifiers with corresponding functional structures are configured according to different monitoring characteristics, so that the monitoring range of the security input circuit is enlarged by complementing the advantages of the two operational amplifiers of different functional structure types. The invention further discloses a railway circuit receiver provided with the security input isolating circuit.

Description

technical field [0001] The invention relates to the field of railway safety protection, and more specifically relates to a safety input isolation circuit and a track circuit receiver provided with the circuit. Background technique [0002] In recent years, railway traffic accidents caused by defects in the design of railway signaling systems have occurred from time to time, causing traffic paralysis in light cases and casualties in severe cases, causing great spiritual losses and property losses to the country and the people, and also to my country's railways. Construction had a bad effect. Therefore, the safety and reliability of the railway signaling system has become the focus of social attention, and it is also an important consideration in the design of any detailed circuit of the railway signaling system. [0003] In the railway track signal system, the track circuit receiver directs the train to run by receiving and demodulating the frequency-shifted signal on the rai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B61L1/02H03F3/45
Inventor 魏敏徐敏兰丰菊张明妨孟丽婷赵怀东孙志忠郜志强于树永
Owner BEIJING RAILWAY SIGNAL
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