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STO (safe torque off) control circuit and drive system

A technology of safe torque off and control circuit, applied in the field of transmission, to achieve the effect of increasing reliability, improving development efficiency and improving safety level

Pending Publication Date: 2018-06-29
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps prevent damage caused when an electric motor starts up incorrectly or stops working properly due to overheating issues that may occur during operation. It uses redundant circuits with different types of signal processing techniques like pulsing backlights (PB) for better security levels while reducing complexities involved in developing it efficiently.

Problems solved by technology

This patented technical problem addressed by this patents relates to ensuring stable control over an electric power transmission device that can safely stop or reduce its rotational speed when needed without causing damage during use.

Method used

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  • STO (safe torque off) control circuit and drive system
  • STO (safe torque off) control circuit and drive system
  • STO (safe torque off) control circuit and drive system

Examples

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no. 1 example

[0028] Such as figure 1 As shown, the first embodiment of the present invention provides a safe torque off control circuit, the safe torque off control circuit includes: a first isolation circuit 11, a first logic processing module 12, a first switching tube module 13 , the upper bridge drive buffer unit 14, the second isolation circuit 21, the second logic processing module 22, the second switching tube module 23 and the lower bridge drive buffer unit 24;

[0029] The first isolation circuit 11 is used to isolate the input first STO signal to obtain the first STO signal after isolation processing; the second isolation circuit 21 is used to isolate the input second STO signal processing to obtain the isolated second STO signal; the isolated first STO signal and the second STO signal are mutually inverse logic signals.

[0030] In this embodiment, the first isolation circuit 11 and the second isolation circuit 21 respectively include a current limiting and filtering circuit, a...

no. 2 example

[0061] The second embodiment of the present invention provides a transmission system, which includes the safe torque off control circuit described in the first embodiment. For the safe torque off control circuit, reference may be made to the above content, and details are not described here.

[0062] In order to better understand this embodiment, the following combination Figure 9 Explain the working process of the transmission system:

[0063] Such as Figure 9 As shown, the transmission system includes a safe torque off control circuit, a controller, an upper bridge drive optocoupler, a lower bridge drive optocoupler, an inverter-side power switch tube, and a motor.

[0064] The safe torque off control circuit controls the PWM drive signal from the controller by controlling the power supply VCC or the enable signal EN of the upper bridge drive buffer unit and the lower bridge drive buffer unit, and then controls the output of the upper bridge / lower bridge drive signal . ...

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Abstract

The invention discloses an STO (safe torque off) control circuit and a drive system. The STO control circuit comprises a first isolating circuit, a first logic processing module, a first switching tube module, an upper bridge drive buffer unit, a second isolating circuit, a second logic processing module, a second switching tube module and a lower bridge drive buffer unit. By the aid of the STO control circuit consisting of two STO passages, the redundancy of the STO function is improved, opposite logic signals are adopted, the system reliability is improved in a staggered redundancy manner, and the safety level is increased. Besides, due to a pure hardware implementation manner, the development complexity is greatly reduced, and the development efficiency is improved.

Description

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Claims

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Application Information

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Owner SHENZHEN HOPEWIND ELECTRIC CO LTD
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