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Optocoupler-based control circuit and method thereof

A control circuit and control branch technology, applied in program control, control system, motor control, etc., can solve problems such as occupying a large space, increasing transformers, increasing cost circuit/software complexity, etc., to achieve optimal life and low cost Effect

Active Publication Date: 2019-03-05
ZHEJIANG HOLIP ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in increased cost as well as circuit / software complexity
Another way is to use dynamic power supply in STO channel, but need to add transformer, which will take up a lot of space

Method used

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  • Optocoupler-based control circuit and method thereof
  • Optocoupler-based control circuit and method thereof
  • Optocoupler-based control circuit and method thereof

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Embodiment Construction

[0029]Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present disclosure.

[0030] The terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the present disclosure. The words "a", "an" and "the" used herein shall also include the meanings of "plurality" and "multiple", unless the context clearly indicates otherwise. In addition, the terms "comprising", "comprising", etc. used herein indicate the existence of stated features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or compon...

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PUM

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Abstract

The invention discloses an optocoupler-based control circuit and a method thereof. The control circuit comprises a first control branch; the first control branch comprises a first control signal inputend, a first optocoupler, a first primary-side on-off control circuit, and a first secondary-side filtering circuit. The first control signal input end is used for receiving a first switch-off function control signal; a primary side of the first optocoupler is used for being coupled to a first control signal input end, and the output of a secondary side thereof is used for controlling first powersupply for a motor driving circuit; the first primary-side on-off control circuit is connected to the primary side of the first optocoupler for periodically switching on and switching off coupling between the primary side and the first control signal input end; the first secondary-side filtering circuit is connected to the secondary side of the first optocoupler for filtering the output of the secondary side and is configured into a lowpass filter, the cut-off frequency of which is lower than the on-off frequency of the primary side. The first control branch also comprises a diagnosis circuitfor diagnosing the working state of the first control branch based on the output and the first power supply of the secondary side of the first optocoupler. The control circuit can also be a safety torque off (STO) circuit.

Description

technical field [0001] The present disclosure relates to the field of electronic circuits, and more particularly, to optocoupler-based control circuits and methods thereof. Background technique [0002] Optocouplers are used in Safe Torque Off (STO) circuits for cost and electrical safety reasons. Usually, in systems with low security requirements, STO is rarely triggered. That is, the primary side of the optocoupler (light-emitting diode, LED) is in a normally-on state for an extremely long period of time. This will seriously reduce the life of the optocoupler. In addition, since there is little opportunity to turn off the LED of the optocoupler for effective diagnosis, a stuck-at failure may occur and affect safety. [0003] In general, optocouplers are not very reliable (compared to other types of isolation components). Therefore, in systems with high safety requirements, it is important to diagnose whether the optocoupler is working normally. The conventional method...

Claims

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Application Information

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IPC IPC(8): H03K19/0175
CPCH02P29/00H03K19/017572H03K17/7955G05B2219/24054G05B2219/25458H02P27/08H02P29/0241G05B9/02H02P3/18H03K17/691
Inventor 徐笑然
Owner ZHEJIANG HOLIP ELECTRONICS TECH
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