1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1577 Optical IsolatorsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO
2、N OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Optical Isolators, UL 1577 Fifth Edition, Dated April 25, 2014 SUMMARY OF TOPICS This revision of ANSI/UL 1577 has been published to delete the upper limit dielectric isolation tolerance (5%) boundary in revised 17.2 and 17.3; d
3、elete the Scope paragraph 1.6; and remove withdrawn ASTM standard, revised 13.2. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are follow
4、ed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. The revised requirements are substantially in accordance with Proposal(s) on this subject dated October 10, 2014. All rights reserved. No part of this publication may be re
5、produced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the i
6、mplied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Stand
7、ard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree
8、to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The require
9、ments in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effe
10、ctive date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. JANUARY 23, 2015 UL 1577 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 23, 2015 UL 1577 tr2 No Text on This PageUL COPYRIGHTED MATE
11、RIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 25, 2014 (Title Page Reprinted: January 23, 2015) 1 UL 1577 Standard for Optical Isolators First Edition June, 1984 Second Edition May, 1989 Third Edition March, 1995 Fourth Edition May, 2000 Fifth Edition
12、April 25, 2014 This ANSI/UL Standard for Safety consists of the Fifth Edition including revisions through January 23, 2015. The most recent designation of ANSI/UL 1577 as an American National Standard (ANSI) occurred on January 23, 2015. ANSI approval for a standard does not include the Cover Page,
13、Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Stand
14、ards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATOR
15、IES INC. ANSI/UL 1577-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 25, 2014 OPTICAL ISOLATORS - UL 1577 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FRO
16、M UL CONTENTS INTRODUCTION 1 Scope .4 2 Units of Measurement .4 3 Undated References 5 4 Glossary .5 CONSTRUCTION 5 General 6 6 Corrosion Protection .6 7 Insulating Materials 6 8 Live Parts 6 9 Spacings .7 PERFORMANCE 10 General .7 11 Dielectric Voltage-Withstand Test 7 12 Overload Test .8 13 Limite
17、d Thermal Aging Test .8 DOUBLE-PROTECTION OPTICAL ISOLATORS 14 General 10 15 Discharge Test .10 16 Optical Isolator Life Test .12 MANUFACTURING AND PRODUCTION-LINE TESTS 17 Dielectric Voltage-Withstand Test .12 RATINGS 18 General 13 MARKINGS 19 General 14 APRIL 25, 2014 OPTICAL ISOLATORS - UL 1577 3
18、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover optical isolators, also called optical couplers or photocouplers: a) Intended to provide unidirectional signal transfer between dielectrically
19、isolated circuits and, b) Intended for use in equipment with a supply voltage not exceeding 600 V ac rms or dc. 1.2 These requirements cover the electrical isolation properties of the insulation between the isolated circuits of the optical isolator. 1.3 These requirements also cover double protectio
20、n optical isolators that are employed in circuits rated up to 250 V, 50 or 60 Hz, in radio, video, and television equipment, and similar equipment in applications in which breakdown of the optical isolator may result in a risk of re, electric shock, or injury to persons. 1.4 These requirements do no
21、t cover the electrical properties of the separate circuits of the optical isolator. 1.5 These requirements apply to optical isolators for use as components in devices and appliances. Compliance of an optical isolator with these requirements does not indicate that the isolator is acceptable for use a
22、s a component of an end product without further investigation. 1.6 Deleted January 23, 2015 2 Units of Measurement 2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. JANUARY 23, 2015 OPTICAL ISOLATORS - UL 1577 4UL COPYRIGHTED
23、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Undated References 3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 4 Glossar
24、y 4.1 For the purpose of this standard the following denitions apply. 4.2 DERATING CURVE A graph of ambient temperature versus power or current, provided by the manufacturer, where the power and/or current is reduced as the operating ambient temperature is increased. 4.3 DIELECTRIC ISOLATION-VOLTAGE
25、 RATING The maximum voltage-withstand potential between the input and output circuits of the optical isolator. 4.4 DOUBLE PROTECTION OPTICAL ISOLATORS Optical isolators employed in some unique audio, video and similar applications bridging reinforced insulation. 4.5 HERMETICAL SEAL Any material empl
26、oyed, such as a case or housing, that completely prevents air ltration, for example an encapsulant. 4.6 INSULATING MATERIALS Any material providing isolation between the input and output of the optical isolator. Housing or Case material that provides isolation over the surface and through the materi
27、al would be considered an insulating material. 4.7 MAXIMUM JUNCTION TEMPERATURE The maximum allowable temperature of the optical isolator semiconductor junction as specied by the manufacturer. 4.8 MAXIMUM OPERATING AMBIENT TEMPERATURE The maximum temperature of the air surrounding the optical isolat
28、or when power is applied, as specied by the manufacturer. 4.9 MAXIMUM STORAGE TEMPERATURE The maximum temperature at which the optical isolator can be stored without any power applied, as specied by the manufacturer. 4.10 PHOTO-EMITTER A device internal to the optical isolator that generates electro
29、magnetic radiation, such as a light-emitting diode (LED), used to transmit signals to the photo sensor. 4.11 PHOTO-SENSOR A device internal to the optical isolator that generates an electrical current due to incident light, such as a photo diode or a photo-conductive transducer, used to receive sign
30、als from the photo-emitter. APRIL 25, 2014 OPTICAL ISOLATORS - UL 1577 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 5 General 5.1 An optical isolator shall be constructed in compliance with Corrosion Protection, Section 6, I
31、nsulating Materials, Section 7, Live Parts, Section 8, and Spacings, Section 9. 6 Corrosion Protection 6.1 Iron and steel parts shall be protected against corrosion by enameling, galvanizing, plating, or other equivalent means. Exception: Encapsulated parts and stainless steel parts need not be prov
32、ided with plating. 7 Insulating Materials 7.1 Insulating materials employed as part of an optical isolator shall be subjected to the Dielectric Voltage-Withstand Test, Section 11, and the Overload Test, Section 12. 7.2 Additionally, insulating materials, other than the case or housing, that are not
33、encapsulated or hermetically sealed, shall also be investigated in accordance with the applicable requirements in the Standard for Polymeric Materials Use in Electrical Equipment Evaluations, UL 746C. 7.3 Insulating materials shall have a relative thermal index or generic thermal index equal to or g
34、reater than the maximum junction temperature or maximum storage temperature of the optical isolator. whichever is greater. Insulating materials where the relative thermal index or the generic thermal index of the material is exceeded shall be subjected to the Limited Thermal Aging Test, Section 13.
35、7.4 Materials used to encapsulate devices, such as a case or housing, shall operate within the generic temperature limitations as specied in the Standard for Polymeric Materials Long Term Property Evaluations, UL 746B, or shall be tested as outlined in Limited Thermal Aging Test, Section 13. 8 Live
36、Parts 8.1 Metal employed for current-carrying parts shall be of stainless steel, plated steel, copper, silver, gold, nickel, aluminum, an alloy of the same, or an equivalent material. APRIL 25, 2014 OPTICAL ISOLATORS - UL 1577 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTR
37、IBUTION WITHOUT PERMISSION FROM UL 9 Spacings 9.1 The optical isolators external spacings between input and output circuits shall be based on the end product spacing requirements. PERFORMANCE 10 General 10.1 Optical isolators shall be tested as described in the Dielectric Voltage-Withstand Test, Sec
38、tion 11 and the Limited Thermal Aging Test, Section 13. 11 Dielectric Voltage-Withstand Test 11.1 Immediately following each of the conditionings indicated in 11.5 11.8, each representative optical isolator shall be capable of withstanding without breakdown for 60 seconds a potential equal to the ra
39、ted dielectric isolation voltage, as specied by the manufacturer, applied between the input and output terminals of the optical isolator. A dc test potential shall be applied to a device having a dc rated dielectric isolation voltage. The value of the potential applied to an ac rated device shall be
40、 in volts rms. 11.2 To determine whether a representative optical isolator complies with the requirements in 11.1, the test potential is to be applied as described in 11.4 by means of test equipment having the characteristics outlined in 11.3. 11.3 The test equipment for conducting the Dielectric Vo
41、ltage-Withstand Test is to have the following features and characteristics: a) A means of indicating the test potential. b) For an ac rated device, a 40 70 Hz test potential that has a sinusoidal waveform. 11.4 The test potential is to be obtained from any convenient source either: a) Having a capac
42、ity of at least 500 VA, or b) If of a lower capacity with the voltmeter connected in the output circuit. The voltage is to be steadily increased until the required test level is reached and is to be held at that value for one minute. The increase in the applied potential is to be at a uniform rate a
43、nd as rapid as is consistent with its value being correctly indicated by a voltmeter. 11.5 Six representative optical isolators are to be tested in the as-received condition. 11.6 Six representative optical isolators are to be exposed to the maximum rated junction temperature for 7 hours, before tes
44、ting. APRIL 25, 2014 OPTICAL ISOLATORS - UL 1577 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 11.7 Six representative optical isolators are to be exposed to 85 percent relative humidity at 32.0 2.0C (89.6 3.6F) for 24 hours, before testi
45、ng. 11.8 Six representative optical isolators are to be exposed to 0.0 2.0C (32.0 3.6F) for 7 hours, before testing. 11.9 Separate sets of representative optical isolators are to be used for each of the various conditions in 11.5 11.8. 12 Overload Test 12.1 Three representative optical isolators sha
46、ll be connected to the rated electrical supply such that the photo-sensor (output) is caused to operate at 150 percent of maximum rated power while the photo-emitter (input) is operated at rated power until temperatures stabilize. 12.2 Immediately after the overload conditioning, as described in 12.
47、1, each of the three representative optical isolators shall withstand the rated isolation voltage as described in 11.1 and 11.4. 13 Limited Thermal Aging Test 13.1 An insulating or encapsulating material, as described in the Insulating Materials Section 7, shall not crack or warp in any of three rep
48、resentative optical isolators when the optical isolators are aged in a full-draft oven at a temperature and time chosen from the graph in Figure 13.1 using the index line that corresponds to the greater of the maximum junction temperature or the maximum storage temperature of the device. All samples
49、 shall be conditioned for 1000 hours unless otherwise agreed by all concerned. Optical isolators shall not be subjected to conditioning less than 300 hours. Immediately after this oven conditioning, all three representative optical isolators shall withstand the rated isolation voltage as described in 11.1 and 11.4. 13.2 The air oven is to be essentially as indicated in the Standard Test Methods for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation, ASTM
