Signal isolation grid circuit

A technology for signal isolation and power isolation, applied in the electrical field, can solve problems such as equipment space limitation, surge, and inability to install one equipment, and achieve the effects of avoiding interference, enhancing reliability, and having a simple and reasonable structure.

Active Publication Date: 2013-08-07
ZHEJIANG WEIXING INTELLIGENT METER STOCK
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many kinds of safety barriers on the market, ranging in price and quality, some only have the function of isolation, some only have the function of surge prot

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Signal isolation grid circuit
  • Signal isolation grid circuit
  • Signal isolation grid circuit

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] A signal isolation barrier circuit includes an automatic switching circuit, an interface circuit, an isolated power supply circuit, two surge protection circuits and two high-speed optocouplers.

[0032] Such as figure 1 As shown, the automatic switching circuit includes an AND gate chip, a NAND gate chip, two RS-485 chips, four pull-up resistors, three pull-down resistors, three matching resistors, a delay capacitor, a filter capacitor and A PNP transistor.

[0033] Pin 7 of the first RS-485 chip U3 is connected to one end of the first pull-down resistor R1, pin 6 is connected to one end of the first pull-up resistor R2, pins 2 and 3 are connected to one end of the second pull-down resistor R3, 8 Pins are connected to the first isolated power supply VCC1, pin 5 is connected to the first isolated power ground, the other end of the first pull-down resistor R1 is connected to the first isolated power ground, and the other end of the second pull-down resistor R3 is connected to...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a signal isolation grid circuit. An existing product only can realize an isolation effect or a surge protection effect. The signal isolation grid circuit comprises an automatic switching circuit, an interface circuit, an isolation power circuit, two surge protection circuits and two high-speed optocouplers; the automatic switching circuit comprises an AND gate chip, a NOT-AND gate chip, two RS-485 chips, four pull-up resistors, three pull-down resistors, matching resistors, a delay capacitor, a filter capacitor and a PNP-type triode; and the isolation power circuit comprises three isolation power sources, filter capacitors, matching resistors, a current limiting resistor, a delay capacitor, a TVS (transient voltage suppressor) diode, a PNP-type triode, a PMOS (P-channel metal oxide semiconductor) transistor, a light-emitting diode, a self-healing fuse and a gas discharge tube. The signal isolation grid circuit has the advantages that the three isolation power sources respectively supply power for a signal circuit at an intrinsic safety end, a signal circuit at a non-intrinsic safety end and a power circuit at the intrinsic safety end, complete isolation is implemented, and surge protection for the intrinsic safety end and short-circuit protection for power output ends are realized.

Description

technical field [0001] The invention belongs to the technical field of electricity and relates to a circuit, in particular to a signal isolation barrier circuit, which is applied to RS485 / RS422 signal protection in industrial control sites. Background technique [0002] With the parallel development of microprocessors and artificial intelligence technologies, the instrumentation industry is developing towards intelligence. Life is easier. With the development of science and technology, there are many types of instruments, which require a lot of manpower and material resources to copy the instrument data. Networking and remote transmission has become a new trend. [0003] Most industrial control meters use RS485 networking, which is convenient for networking and simple wiring. With the wiring, problems arise. The instrument is a precision device, and it is easy to introduce interference if the wiring is long, and the more serious one is lightning induction. When lightning...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H03K19/14H02H9/04
Inventor 黄文谦李祖光方炯林扬宣赵彥华
Owner ZHEJIANG WEIXING INTELLIGENT METER STOCK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap