A safe torque off circuit and system

A safe torque off and circuit technology, applied in control systems, emergency protection circuit devices, electrical components, etc., can solve the problem of low diagnostic coverage, improve diagnostic coverage, prevent fault accumulation, and improve safety integrity The effect of sexual grade

Active Publication Date: 2019-06-28
NANJING ESTUN AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent only mentions the diagnosis of the power supply, and there is only undervoltage without other diagnosis, and the diagnosis coverage is not high

Method used

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  • A safe torque off circuit and system
  • A safe torque off circuit and system
  • A safe torque off circuit and system

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Embodiment Construction

[0051] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, and the scope of protection of the present invention is not limited to the following embodiments.

[0052] like figure 1 , 2 As shown, the safe torque off circuit of the present invention includes a power supply module, an input module A, an input module B, an execution module A, an execution module B and an STO diagnosis module. Among them, the input module A and the execution module A are connected in series to form the first channel, and the input module B and the execution module B are connected in series to form the second channel (constituting a dual-channel redundant design).

[0053] 1. Power module and its diagnostic circuit

[0054] (1) Power module

[0055] like image 3 As shown, the power module has a three-level power supply. For the second-level power supply, the 5V_STO power supply is related to the safety function. In additi...

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PUM

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Abstract

The invention discloses a safe torque turn-off circuit and system. The safe torque turn-off circuit comprises a power source module, an input module, an execution module and an STO diagnosis module. Double channel redundancy design is adopted in each of the input module and the execution module. Double channel design is adopted in an output passageway, dynamic detection of an output module is realized in a zero vector state, fault accumulation can be prevented, and diagnosis coverage rates can be improved. The double channel redundancy design is also adopted in an input passageway, dynamic monitoring of the input module can be realized via transmission of two channels of test narrow pulses with certain phase difference between the same, and the diagnosis coverage rates can be improved.

Description

technical field [0001] The invention relates to the field of power electronic circuits, in particular to a safe torque off (Safe Torque Off, STO) circuit and a safe torque off system. Background technique [0002] In the prior art, in order to prevent accidental starting of the motor, or to avoid accidents involving personal injury, people propose an STO function for frequency converters, servo motor drivers and other products. This function prevents the drive from generating torque in the motor and is suitable for inclusion in a machine's safety system. The IEC61508 standard ("Functional Safety of Electrical / Electronic / Programmable Electronic Safety Systems") officially released by the International Electrotechnical Commission proposes the concept of Safety Integrity Level (SIL) to measure the reliability of safety functions and divides it into four Level, the highest level in the industrial field is SIL3. The STO function meeting SIL3 can bring higher security, which is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08H02P29/00G01R19/165
CPCG01R19/16576H02H7/08H02P29/00
Inventor 姚瑱徐璐徐瑜杜鑫范仁凯李文龙陈富徐小军钱巍徐正华
Owner NANJING ESTUN AUTOMATION CO LTD
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