IS 14886: Switch Mode Power Supply

9 Pages·2000·1.1 MB·English

by  Bureau of Indian Standards

इंटरनेट मानक
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 14886 (2000): Switch Mode Power Supply [LITD 16:
Computer Hardware, Peripherals and Identification Cards]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 14886:2000
w@v7-Fm

*m7’m-Ei+faRm
Indian Standard
SWITCH MODE POWER SUPPLY — SPECIFICATION
.
Ics 31.220.20

Q BIS 2000
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN,9 BAHADUR SHAH ZAFAR MARC
NEW DELHI 110002

Decetnber 2000 Price Group 2
Computer Hardware Sectional Committee, LTD 37
FOREWORD
This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the
Computer Hardware Sectional Committee had been approved by the Electronics and Telecommunication
Division CounciI.
The objective of this standard is to laydown performance requirements for ensuring quality and reliability of
—
Switch Mode Power Supplies (SMPS) to be used with personal computers and peripherals, such as printer,
video monitor, floppy disk drives and secondary storage devices. The standard is designed to serve the public
interest through eliminating misunderstandings between manufacturers and purchasers, facilitating
interchangeability and improvement of products and assisting the purchaser in selecting and obtaining with
minimum delay, the proper product for his particular need.
For optimum performance and to accelerate the growth with increased productivity, certain minimum quality
control procedures are to be adopted by the manufacturers of SMPS.
The technical committee responsible for the preparation of this standard has reviewed the provisions of the
following IEC Publication and has decided that it maybe used in conjunction with this standard to carry out
tests given in 6.2(c) of this standard till Indian Standard on this subject is published.
IEC 61000 (Part 4/See 5) : 1995Electromagnetic compatibility (EMC) :Part 4 Testing and measurement
techniques—Section 5: Surge immunity test
For the purpose of deciding whether a particular requirement of this standard is complied with, the final
value, observed or calculated expressing the result of a test or analysis, shall be rounded off in accordance
with IS 2: 1960 ‘Rules for ro u nding off numerical values (revised)’. The number of significant places
retained in the rounded offvalue s hould be the same as that of the specified value in this standard.
IS 14886:2000
Indian Standard
SWITCH MODE POWER SUPPLY — SPECIFICATION
1 SCOPE per IS 14700 (Part 4/See 4); and
1.1This standard lays down general and performance c) Su&e/Spike Tesf — As per IEC 61000 (Part
requirements for switch mode power supply (SMPS) 4/See 5):1995.
to be used with personal computers (PC) and peri-
7 PERFORMANCE REQUIREMENTS
pherals such as printer, video monitor and floppy .—
7.1 The SMPS shall meet the performance require-
disk drive and other secondary storage devices.
ments as laid down in Table 1.
2 REFERENCES
Table 1Performance Requirements
2.1 Tlic hldian Standards iadimtcd in Annex A
contain provisions which through reference in this
text, constitute provision ofthis standard. Atthe time SlNo. Charaeteristies Requirements
i) Vkual examination The SMPS shall be free from
of publication, the editions indicated were valid. All workmanship defeets, sharp edges,
standards are subject to revision, and parties to nicks, scratches, burrs etc. AU the
agreements based on this standard are encouraged to fmteners shall befixed properly
investigate the possibility ofapplyingthe most rcccnt ii) Lke effect + 1‘Yo output regulation for
i80-264 Vacinput variation
editions of the standards indicated in Annex A. iii) Power output 200w (Ma)
iv) Output vokage +5V/4 – 20A, +12V12-8A
3 TERMINOLOGY
–5VI0 – 0.54, – 12V/O– 0.5A
3.1 For the purpose of this standard, the terms and v) Load regulation for a + 5V/f 3‘/o;AOothers/f5°/o
variation ofload from
definitions as given in IS 7204 (Part 1)slrall apply.
Mm toMax load and
4 GENERAL REQUIREMENTS vice-versa forthe Out-
put under test snd out-
4.1 The SMPS shall be easily detachable from the puts at 50 percent load
personal conlputer/peripherals or provision should vi) Effkiency atnominal 70% Min
input and rated load
exist for incorporating the same on main PCB. The
vii) Periodk and random +5V150 mV, +12Vl120 mV, – 5VI
SMI?Sunit shall be self-contained. The input power deviation (P.4RD) 100 mV, -12V/150 mV
cable shall reach the unit directly. The dc outputs measured peak-to-peak
shall bc taken from connectors mounted on chassis atrated load
viii) Dynamic load regulation +5Vk3; All others /15’%.
of the SMPS. The fuse shall also bc mounted on the
load chamzefrom&tin to

unit. The power shall be draw n to Ihe SMPS using Max rated-load
3-wire systems. ix) Etfecl ofpower No output dropout for0.5 cycle
interruptinn (10 ms) input 10ss
5 SAFETY REQUIREMENTS No. ofpower inter- The unit shall withstand when
ruption and the rate of the power is intermpted for 100
5.1 The SMPS shall conform 10safety requirements.
interruption times at the rate of 6 operations
These tests shall be carried out in accordance with per minute
IS 13252 and shall meet the requirements specified x) Cross regulation (The +5Vlk1°/q +12Vkt5°/o
output under test shall An Othdtlovo
therein for following tests:
beloaded at 50% and
a) Earth leakage current test shall becarried out the other loads shall
bevaried tlom minimum
according to 5.2 of IS 13252.
load totill load)
b) Dielectric test as per 5.3 of 1S13252, and xi) Overload protection Provided for all outputs (foldbactd
shutdown type)
c) Short circuit protection shall alsobeprovided.
xii) In-rush current at 20A peak (A4ux)
6 EMI/EMC REQUIREMENTS rated input voltage
xiii) Hold up time at rated 20 ms (&tin)
6.1 The conducted emission and the radiated emission
load and minimum input
shall be limited to the requiremmtts specified in voltage
Table 2, Table 4 and Table 6 for Class B equipment xiv) Power good signal
(optional):
in IS6873 (Part 7).
a) Signal level: STD. TTI.
6.2 Conducted Susceptibility Test b) Time on delay 100-500 rns
While switching onthe ac inprs~tbe
The following tests shall be carried out: power cut signal shall become high
after +5v output reaches 4.75V with
a) Electrostatic Discharge Test — As per IS
a delav tolerance which lie between
14700 (Part 4/See 2); 100 b- 500ma.
b) Electrical Fast Transient/Burst Test — AS
1
IS 14886:2000
8 MARKING samples shall be distributed for various tests as
specifkd in Table 2.
8.1Each product shall belegiblyand indeliblymarked
at least with the following: 10.1.1.2 Criteria for acceptance
a) Manufacturer’s name or trade-mark, There shall be no failure in any of type tests, in case
offailure, twicethe number ofsamples shall betaken
b) Model designation,
and subjectedtothetestsin which failure has occurred
c) Country of manufacture,
and other tests that have bearing on the test results.
d) Voltage range, No failure shall be permitted in the retests.
e) Fuseanditsrating (preferablereadilyaccessible 10.1.2 Routine Tests
to the user),
The following shall constitute the routine tests:
o Inputloutput points,
a) Check the operation of SMPS using target
~) Additional marking such as high voltage
load.
points with their voltage range,
b) Check performance requirements as per
h) Frequency of operation,
Table 1 [S1No. (ii), (vii) and (ix)].
j) Earthing terminal, and c) Check safety aspects as given in 5.1.
k) ON/OFF switch marking.
10.1.3Acceptance Tests
Compliance is checked by inspection and by rubbing
The following shall constitute the acceptance tests:
the marking by hand for 15 s with a piece of cloth
soaked with water and again for 15swith a piece of a) Check as per 4, 5, 6 and 8.
cloth soaked with kerosene. Atler the teatthe marking
b) Check as per Table 1.
shall be legible; it shall not be easily possible to
The sampling plan and acceptable quality level(AQL)
remove marking plates and theyshall shownocurling.
shall be as agreed to between the manufacturer and
8.2 The SNIPSmay alsobe marked with the Standard
the buyer and shall be selected from IS 10673.
Mark.
Table 2 Schedule of ~pe ‘lksts
8.2.1 The use of the Standard Mark is governed by (Clauses 10.1.1 and 10.1.1.1)
the provisions of Bureau of Indian Standards Act,
1986 and the rules and regulations made thereunder. Group Test ClaISWRef No. of
of Ttsis samples
Details of conditions under which a license for the
.%osdard
use of the Standard Mark may be granted to manu- o Check forgeneral requirements 4
facturers or producers may be obtained from the Check forperformance requirements Table 1
1
Bureilu of Indian Standards. Check for EMIIEMC requirements 6 3
Check for safety requirements 5
9 OPERATING AND INSTRUC T ION MANUAL Check for marking requirements 8 1
9.1 An instruction manual containing information 1 Drop (Free Fall) Test 10.2.1 1
Bump Test 10.2.2
relating to installation, operation, routine maintenance 1
2 Vibration Test 10.2.3
and safety precaution shall be made available with
Dry Heat Test 10.2.4
each SMPS. 1
Damp Heat Test 10.2.5
Cold Test 10.2.6 I
9.2 On request, authorised maintenance agency shall
be provided with circuit diagram, components and 3 Bum-in Test 10.2.7 1
parts identification and layout.
10.2 Environmental ‘1’ksts
10 TESTS
10.2.1 Fiwe Fall Test
10.1 Classification of Tests The SMP$ shall be subjected to free fdl test from a
height of25 mm in accordance with IS 9000 (Part 7/
10.1.1 Type Tests
Sec 4). Total number of falls shall be 8 (4 comers +
The tests specified in Table 2 shall constitute type 4 edges) in unpacked condition.
tests and shall be carried out in the sequence
10.2.2 Bump Test
mentioned therein.
The SMPS in unpacked condition with power OFF
10.1.1.1 Number of samples
shall be subjected to Bump Test carried out in
For type tests, number of samples shall be three of accordance with IS 9000 (Rut 7/See 2), the number
the same model, type and make ofthe SMPS selected of bumps being 1 000 and with acceleration 40 g
preferably at random from a regular product lot. The under packed condition.

.
L
IS 14886:2000
10.2.3 P2bration Test 10.2.6 Cold Test
The SNIPS in unpacked condition with power OFF The SMPS in unpacked condition with power OFF
shall be subjected to vibration test at a frequency of shall be subjected to cold test of severity of 10”Cfor
10to 55 Hz and acceleration 1g for 45 min on each 2 h carried out in accordance with IS 9000 (W-t 2/
axis (X, 1’,2) in accordance with IS 9000 (Part 8). Sec4). The duration ofrecovery shall be 1to 2h. To
avoid condensation, equipment to be brought to
10.2.4 Dy Heat Test
ambient temperature in a controlled environment.
The Sh@S in “unpacked condition with power OFF
10.2.7 Burn-in Test
shall be subjected to dry heat test of severity of 55°C
for 16 h in accordance with IS 9000 (Part 3/See 5). The SMPS shall be subjected to burn-in test at a
temperature of45°C for 48 h in power ON condition.
10.2.5 Damp Heat (Cyclic)
10.2.8 After each environmental tes~ the fictional
The SMPS in unpacked condition with power OFF
performance as given in Table 1 shall be performed
shall be subjected to damp heat cyclictest carried out
after recove~ of 1to 2 h.
in accordance with IS 9000 (Part 5/See 1), at a
temperature of 40°C and relative humidity of 90
percent for two cycles.
ANNEX A
(Clause 2.1)
LIST OF REFERRED INDIAN STANDARDS
IS No. fitle IS No. Title
6873 (Part 7) : 1999 Limits and methods ofmea- (Part 7/See 4) :1979 Impact test, Section 4 Free
surements of radio distur- fall
bance characteristics: Part 7
(Part 8) :1981 Vibration (sinusoidal) test
Information technology
equipment (first revision) 10673:1983 Sampling plans and proce-
dures for inspection byattri-
7204 (Part 1) : 1974 Stabilized power supplies dc
butes for electronic items
output: Part 1 Terms and
definitions 13252:1992 Safety of information tech-
9000 Basic e nvironmental testing nology equipment including
procedure s forelectronicand electrical business equip-
ment
electrical items:
(Part 2/See 4) :1977 Coldtes~Section4Coldtest 14700 Electromagnetic compati-
for heat dissipating items bility (EMC):
with gradual change oftem-
(part 4/See 2) :1999 Testing and measurement
perature
techniques, Section 2 Elec-
(Part 3/See 5) :1977 Dry heat test, Section 5Dry trostatic discharge immunity
heat test for heat dissipating test
items with gradual change
(Rut 4/See 4) :1999 Testing and measurement
of temperature
techniques, Section 4 Elec-
(Part 5/See 1) :1981 Damp heat (cyclic) test,
trical fast transient/burst
Section 1 16+ 8 h cycle immunity test
(Part 7/See 2) :1979 Impact test, Section 2 :
Bump
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote
harmonious development of the activities of standardization, marking and quality certification of goods
and attending to connected matters in the country.
Copyright
BIS has the copyright of all its publications. No part of these publications may be reproduced in any form
without the prior permission in writing of BIS. This does not preclude the free use, in the course of
implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.
Enquiries relating to copyright be addressed to the Director (Publications), BIS. —
Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are inpossession ofthe latest amendments oredition byreferring tothe latest issue of
‘BIS Catalogue’ and ‘Standards: Monthly Additions’.
This Indian Standard has been developed from Doc :No. LTD 37 (1776).
Amendments Issued Since Publication
Amend No. Date ofIssue Text Affected
BUREAU OFINDIAN STANDARDS
Headquarters :
Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telegrams : Manaksanstha
Telephones :3230131,3233375,3239 4 02 (Common to alloffices)
Regional Offices : Telephone
Central :Manak Bhavan, 9 Bahadur Shah Zafar Marg 3237617
NEW DELHI 110002 { 3233841
Eastern ; 1/14C. I. T. Scheme VII M, V.I. P.Road, Kankurgachi 3378499,3378561
CALCUTTA 700054 { 3378626,3379120
Northern : SCO 335-336, Sector 34-A, CH-ANDIGARH160022 603843
602025
{
Southern :C. I. T.Campus, IV Cross Road, CHENNAI 600113 2350216,2350442
2351519,2352315
{
Western :Manakalaya, E9 MIDC, Marol, Andheri (East) 8329295,8327858
MUMBAI 400093 { 8327891,8327892
Branches : AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE.
FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR.
LUCKNOW. NAGPUR. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM.
Printed at : Prabhat Offset Press, New Delhi-2