Be sure to read the “Important Notice for TI Reference Designs” at the end of the article, as there are rules regarding the use of this material. Note the circuit diagram and partially populated bill of materials. Texas Instruments has a reference design for this type. Source of images: Transformer IsolationĪ third isolation technique within SSRs is through transformer inductance. The datasheet shows the internal structure and a comparison to other SSR types within the series: This works by generating an oscillating signal which is capacitively coupled across the isolation barrier, and which is then used to charge the gates of the output MOSFETs. Within the Panasonic AQY2 series, some part numbers with an AQY2C prefix use this configuration. Part number 306-1308-ND is another example of optical coupling (Coto Technology number C347S).Īn alternative is capacitor coupled isolation. Image source: [click here $file/LCB716.pdf Part number CLA311CT-ND is one example (IXYS number LCB716STR). The output side may vary, but all optically isolated SSRs will look similar in this regard.
Note the photodiode and coupling symbols that are common in all of those. Most random picks will produce an optically isolated device.
Here is the main category for solid state relays. The Digi-key site currently (as of this posting) does not include a filter for the isolation type, so it’s important to recognize the optical feature in a drawing. Although they are not common, a few non-optical types are commercially available.Ĭontinue with an optical isolation review or jump to:įirst, let’s quickly review the optical isolation structure. However, any isolation mechanism could theoretically be incorporated into an SSR. 238000002955 isolation Methods 0.With optically isolated solid state relays (SSR) so common, it’s easy to assume that all of these products will use that coupling architecture.230000000903 blocking Effects 0.000 claims abstract description 7.230000005291 magnetic Effects 0.000 claims abstract description 32.230000037361 pathway Effects 0.000 claims abstract description 51.239000000463 material Substances 0.000 claims abstract description 94.230000003287 optical Effects 0.000 title claims abstract description 148.Assignors: AZIMI, MASUD, KNOPP, KEVIN J., RHODES, GREGORY VANDER, VAKHSHOORI, DARYOOSH, WANG, PEIDONG Application granted granted Critical Publication of US7057791B2 publication Critical patent/US7057791B2/en Status Expired - Fee Related legal-status Critical Current Anticipated expiration legal-status Critical Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US45422303P priority Critical Application filed by Masud Azimi, Daryoosh Vakhshoori, Knopp Kevin J., Rhodes Gregory Vander, Peidong Wang filed Critical Masud Azimi Priority to US10/802,069 priority patent/US7057791B2/en Publication of US20040240031A1 publication Critical patent/US20040240031A1/en Assigned to AHURA CORPORATION reassignment AHURA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Rhodes Gregory Vander Peidong Wang Priority date (The priority date is an assumption and is not a legal conclusion. Original Assignee Masud Azimi Daryoosh Vakhshoori Knopp Kevin J. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Masud Azimi Daryoosh Vakhshoori Kevin Knopp Gregory Rhodes Peidong Wang Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US10/802,069 Other versions US7057791B2 Google Patents US20040240031A1 - Compact multipass optical isolator US20040240031A1 - Compact multipass optical isolator
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