DOCSLIB.ORG

Solid State Relays, Din Rail Relay & Power-Io Ssr Contactors

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Solid State Relays, Din Rail Relay & Power-Io Ssr Contactors Solid state relays, din rail relay & Power-io ssr contactors Solid state relays, SCR thyristors, solid state contactors, mosfet based solid state relays, din rail relay modules, din rail heat sinks and other automation I/O products Power-io™ provides advanced products for power control applications, using customized igbt designs, mosfets, or solid state switching technology: ● Large inventory of I/O modules and DIN rail solid state relay products. ● Specializing in SSR, SCR, mosfet, IGBT, alternistor and I/O products ● Advanced Maximum Surge Survival™ technology for 3 layers of surge protection ● Fourth generation of advanced DCB direct copper bonding technology + optimized thermal engineering + customized SCR die selection = superior thermal performance ● Power control, heater contactors, solid state motor starters, lighting contactors, robotics, PLC interface i/o, and network i/o. Industrially hardened for commercial, military FCS, aerospace, test equipment, transportation, HVAC & other applications ● Custom control engineering for sophisticated electrical power switching applications ● Industry leading SCR diagnostics with an Alert output in the C Family products ● High speed, high reliability, rugged industrial design, no moving parts ● Ultra precise zero crossing for reduced EMI, without the cost of external filters ● Manufactured in the USA, Canada, or Mexico. Shipped worldwide. ● No "minimum order" requirements; credit cards, government P-Cards, purchase orders, and mobile-friendly PayPal payments are accepted. ● Smallest installed size = more amps per square inch. DIN rail solid state relays 0.1 - 100 amp capability Power-io, Inc. 537 Braemar Ave. Naperville, IL 60563-1372 USA Tel: +1 630 717 7335 sitemap [email protected] | RoHS | Legal | Privacy | Trademarks | Web Design | © 1998-2014, POWER-IO NEW solid state relays | Company | Solid state relay and i/o | SSR library | Sales | View cart | Contact http://www.power-io.com/ [9/29/2014 11:48:58 AM] New ssr, scr, solid state relays and igbt products. New solid state relays, solid state contactors, or din rail io modules. RoHS and CE now available in the DC switching mosfet or IGBT products The popular HDD-E family of solid state relays are now available with RoHS and CE. For DC switching applications, PWM switching, alternative energy applications, and related DC installations, Power-io provides a wide range of voltage and amperage models. -- Sept 20, 2014 6MW hydroelectric generators start with Power-io The third largest user of hydroelectric power is Brazil. This brief application note shows a 6MW Francis Turbine system, using Power-io's 900 VDC solid state relay as part of the generator exciter circuit. Photos supplied by Semi, a premier manufacturer of turbines and control systems in Brazil. -- Oct 27, 2013 IO-ODC and IO-OAC modules for RoHS applications Power-io continues to improve the product design to meet the 2014 RoHS Restriction of Hazardous Substances directive. Many of the I/O modules are RoHS now, and several additional models are in RoHS transition -- Oct 1, 2013 New 0-10 VDC analog input option The CZ2H-IDC2 has been expanded to accept dual DC inputs OR one 0-10 VDC analog input. The analog input option is jumper selectable. This permits ON/OFF/ON/OFF PWM control based upon a 1 second time period OR based upon half sine waves (8.3ms). The high speed half cycle PWM is used with fast responding loads such as IR heaters. -- April 22, 2013 Additional easy ways to process your orders Power-io's online ordering system accepts MasterCard, Visa, Discover, and American Express credit cards. Purchases orders from pre-approved customer locations can also be entered. Now, PayPal has been added to the online check-out process, which is helpful for purchases from your mobile device. -- April 10, 2013 New Din Rail Controller, with local display -- temperature control, process control, analog control, and more. The new K85 is a multi-purpose, yet simple, controller. Installed on a din rail, the controller accepts an analog input and generates multiple outputs. Applications include: industrial temperature controller, food processing temperature controller, EIA-485 communications remote controller, remote analog data point, remote digital output device, and more. -- Oct 6, 2012 New Din Rail Controller -- temperature control, process control, analog control, and more. The new K30 is a multi-purpose, yet simple, controller. Installed on a din rail, the controller accepts an analog input and generates multiple outputs. Applications include: industrial temperature controller, food processing temperature controller, EIA-485 communications remote controller, remote analog data point, remote digital output device, and more. -- Jan 21, 2012 http://www.power-io.com/new.htm (1 of 7) [9/29/2014 11:49:02 AM] New ssr, scr, solid state relays and igbt products. How to: use a voltage divider, or diode, to change the control input By installing a voltage divider, or a zener diode, in front of the Power-io's control input, you can change the input range. For example, if you have a 48 VDC control signal from a solar application, using a voltage divider or diode, we can reduce that so that it is an acceptable control input signal. -- Sept 15, 2011 New IGBT solid state relay -- model HDD-6V20E The HDD Family of DC switching solid state relays has been expanded to include the new HDD-6V20E. This is an IGBT-based, DC switching, solid state relay, including a high performance driver. This provides: ● Faster -- 16kHz switching for PWM loads ● Cooler -- New Ultra Cool Technology™ thermal transfer design ● Lighter weight -- Ideal for transportation applications The HDD-6V20E is rated for switching up to 600 VDC and up to 20 amps. The product is in stock for immediate delivery. -- Mar 17, 2011. Solar Applications: Power-io is presently installed in solar applications throughout the world. Applications include: switching of DC diversion loads, switching of AC diversion loads, inverter applications, PWM of DC loads, motorized solar panel positioning systems, California Solar Panel Disconnects, Outback Power applications, and more. -- Oct 22, 2010. How to: Convert a Normally Open SSR to a Normally Closed SSR By installing an IO Module in front of a solid state relay, you can invert a control signal. This is helpful for changing the logic of a solid state relay, or other similar device. -- Oct 13, 2010. New IGBT solid state relay -- model HDD-9V30E The HDD Family of DC switching solid state relays has been expanded to include the new HDD-9V30E. This is an IGBT-based, DC switching, solid state relay, including a high performance driver. This provides: ● Faster -- 12kHz switching for PWM loads ● Cooler -- New Ultra Cool Technology™ thermal transfer design ● Lighter weight -- Ideal for transportation applications The HDD-9V30E is rated for switching up to 900 VDC and up to 30 amps. The product is in stock for immediate delivery. -- Aug 2, 2010. Fast shipping capability Need it fast? Contact us for FedEx, UPS, DHL, courier, freight forwarder, or other shipping methods. -- Jan 18, 2010 RoHS mosfet solid state relays for dc switching applications RoHS is now available in HDD-xxxxE family of mosfet or IGBT based solid state relay products -- Jan 5, 2010 New state laws restricting or prohibiting mercury relays More states ban mercury. Power-io supplies solid state relays that can replace many types of mercury contactors or mercury displacement relays. The applications include: industrial heater contactors, motor starters, highway lighting contactors, stadium lighting systems, food cooking control systems, and more. -- Oct 28, 2009 I2T fuses and fuse holders Solid state contactors and other thyristor-based products are usually protected by I2T fuses. Power-io stocks a variety of I2T fuses that are often used with our products. This includes fuse and fuse holders: I2T fuses or fuses with L bracket tabs: L-Bracket 63FE or 100FE. -- May 25, 2009 http://www.power-io.com/new.htm (2 of 7) [9/29/2014 11:49:02 AM] New ssr, scr, solid state relays and igbt products. Carbon footprint reductions Power-io has an active program to reduce or recycle the amount of paper products used, recycle shipping containers, and has completely eliminated the purchasing of any new plastic "peanuts". We are involved in customer projects including: US DOE Solar Decathlon 2009 Solarhouse -- MST.edu; California solar array disconnects; solar panel positioning systems; solar/battery invertors; wind turbine control systems; vehicle hydro gas; and more. -- March 1, 2009 Mercury contactor recycling Power-io manufactures solid state relays and contactors that are often used to replace mercury contactors. Mercury contactors (also called: mercury relays, MDR, or mercury displacement relays) are restricted or prohibited in many states in the USA, and in many countries throughout the world, due to 40-100+ grams of mercury inside each one. Bethleham Apparatus provides an EPA approved way of legally disposing of small quantities of mercury contactors. Visit: Mercury recycling kit -- Dec 19, 2008 (Power-io is NOT affliated with Bethleham Appartus.) CDD-1V300 Family of high amperage, dc switching, IGBTs Power-io manufactures custom solid state switching products for unique applications. For DC installations, we offer DC switching of loads from 200-600 amps, or momentary loads up to 1000 amps DC. The control input board has a standard high speed capability of up to 2 kHz PWM frequency. Visit: DC contactors for custom applications -- Sept 5, 2008 Dual IGBTs (or back-to-back IGBTs) for high speed switching of an AC load The Power-io HDD-6V15 is a completely packaged IGBT module that includes a high speed 15 kHz control input circuit. Normally this product is used to switch DC loads such as solar array panels, vehicle applications, and hydrogen-generating fuel cells. When you install 2 IGBTs in a back-to-back configuration, you can achieve extremely high speed switching of an AC sinewave.
Load more

Recommended publications
  • Replacement Parts with Drawings in .Pdf Format
    REPLACEMENT PARTS CATALOG This catalog contains part numbers for the most common replacement parts for QMARK heaters shown in the Table of Contents. Additional parts for these heaters may be available - consult factory for availability. Parts for QMARK heaters not listed in the Table of Contents may be available - consult factory for availability. NOTE: Parts longer than 8’ in length cannot ship UPS. Consult factory for shipping information. TABLE OF CONTENTS BASEBOARD CEILING HEATERS CRN ..............................................................20 Baseboard Accessories ..................................2 CDF ................................................................9 ARL ..............................................................21 CBD ................................................................3 EFF..................................................................9 CHRR............................................................23 HBB ................................................................3 QCH ................................................................8 QMK (2500 Series) ........................................2 BUILDER PRODUCTS QMKC..............................................................2 UNIT HEATERS BATH VENTS ................................................37 MUH..............................................................11 WHOLE HOUSE FANS ..................................41 WALL HEATERS MUH35..........................................................14 RESIDENTIAL CEILING FANS........................43
    [Show full text]
  • Elecsys Watchdog Scout / SCT-N3-20 Quick-Start Guide
    Elecsys Watchdog Scout / SCT-N3-20 Quick-Start Guide Package contents: Scout Monitoring unit with cable harness and connectors (communication terminal w/ brackets & cable on satellite units); 100A interruption relay; AC detect probe; 120/240VAC - 12/24VAC step-down isolation transformer w/ plastic safety guards; set of 2 mounting brackets w/fasteners; 1 1/4” threaded connector for mounting directly to the rectifier enclosure. *Please inspect package contents and immediately notify Elecsys Technical Support at (913)825-6366 or email [email protected] if there are any discrepancies. Recommended: Watchdog Installation Supplies Kit -- WD-48-0002-00 (includes 1” flexible conduit, cable to run from rectifier to Scout unit, connectors, mounting hardware, and conduit fittings); Depending on the type of installation, the following may be necessary: Lag bolts & washers for mounting unit; conduit (approx. 4’ per site); 1” conduit connectors; #4 welding cable (ap- prox.. 5’ per site – depending on max amps of rectifier could use 16ga to #4 wire for connecting the relay); 18” of 16ga. 2 wire cable (preferably with White and Black insulated wires) to connect the incoming commercial power to the input of the Isolation transformer; a split bolt splice and electrical tape can be used for larger gauge wires, the yellow connectors will usually work for smaller gauge wires on the relay circuit; 8 x ½” hex head self-tapping screws to mount the relay and transformer inside the rectifier; assortment of red, blue, and yellow butt splice conns, ring conns, disconnects conns, and fork conns; plastic zip-ties. Important Installation Notes: Do not connect directly to high voltage AC.
    [Show full text]
  • Five Signs That It Is Time to Replace the Mercury Based Relays and Switches in Your Industrial Application
    • white paper • white paper • white paper • white paper • industry: industrial process heating author: brian bettini Five Signs That it is Time to Replace the Mercury Based Relays and Switches in Your Industrial Application And What to Look for in a Suitable Replacement Summary: Mercury relays have been used in industrial applications for decades, most commonly for power switching. For example, in applications that use process heating, mercury relays are traditionally used to power on and off of electric heaters efficiently. But these kinds of relays are being replaced for several reasons. The latest generation of mercury relay/mercury switch alternatives is safer and more accurate and just as durable. • white paper • white paper • The background: mercury in industry U.S. patents for a mercury-based relay can be found as far back as 1937, and they have been used in industry for decades.1 They were first developed for applications where contact erosion could present a challenge for more conventional relay contacts, or where constant cycling was needed (such as heating operations). Mercury relays have been known to overheat, however, and there have been known cases of relays exploding and sending vaporized mercury into the workspace. This can potentially create a serious environmental and safety issue, not to mention the need for costly clean-up. But even with that risk, and with the EPA and the European Union placing bans on the use of mercury, some manufacturers are still using mercury relays or similar outdated switching devices. Why? Some industrial engineers claim to prefer mercury relays because they believe them to be durable and capable of handling difficult and dirty environments.
    [Show full text]
  • Capacitors, Fixed, Chips, Ceramic Dielectric, Types I
    Page 1 of 33 CAPACITORS, LEADLESS SURFACE MOUNTED, TANTALUM, SOLID ELECTROLYTE, ENCLOSED ANODE CONNECTION ESCC Generic Specification No. 3012 Issue 4 September 2020 Document Custodian: European Space Agency – see https://escies.org ESCC Generic Specification PAGE 2 No. 3012 ISSUE 4 LEGAL DISCLAIMER AND COPYRIGHT European Space Agency, Copyright © 2020. All rights reserved. The European Space Agency disclaims any liability or responsibility, to any person or entity, with respect to any loss or damage caused, or alleged to be caused, directly or indirectly by the use and application of this ESCC publication. This publication, without the prior permission of the European Space Agency and provided that it is not used for a commercial purpose, may be: − copied in whole, in any medium, without alteration or modification. − copied in part, in any medium, provided that the ESCC document identification, comprising the ESCC symbol, document number and document issue, is removed. ESCC Generic Specification PAGE 3 No. 3012 ISSUE 4 DOCUMENTATION CHANGE NOTICE (Refer to https://escies.org for ESCC DCR content) DCR No. CHANGE DESCRIPTION 1233, 1257 Specification up issued to incorporate changes per DCR. ESCC Generic Specification PAGE 4 No. 3012 ISSUE 4 TABLE OF CONTENTS 1 INTRODUCTION 8 1.1 SCOPE 8 1.2 APPLICABILITY 8 2 APPLICABLE DOCUMENTS 8 2.1 ESCC SPECIFICATIONS 8 2.2 OTHER (REFERENCE) DOCUMENTS 9 2.3 ORDER OF PRECEDENCE 9 3 TERMS, DEFINITIONS, ABBREVIATIONS, SYMBOLS AND UNITS 9 4 REQUIREMENTS 10 4.1 GENERAL 10 4.1.1 Specifications 10 4.1.2 Conditions
    [Show full text]
  • Picosecond Pulse Generators Using Microminiature Mercury Switches
    NBSIR 74-377 PICOSECOND PULSE GENERATORS USING MICROMINIATURE MERCURY SWITCHES James R. Andrews Electromagnetics Division Institute for Basic Standards National Bureau of Standards Boulder, Colorado 80302 March 1974 Final Report Prepared for Department of Defense Calibration Coordination Group 72-66 NBSIR 74-377 PICOSECOND PULSE GENERATORS USING MICROMINIATURE MERCURY SWITCHES James R. Andrews Electromagnetics Division Institute for Basic Standards National Bureau of Standards Boulder, Colorado 80302 March 1974 Final Report Prepared for Department of Defense Calibration Coordination Group 72-66 U.S. DEPARTMENT OF COMMERCE, Frederick B. Dent, Secretary NATIONAL BUREAU OF STANDARDS Richard W Roberts Director TABLE OF CONTENTS Page I. INTRODUCTION 1 II. FLAT PULSE GENERATOR CONCEPT 5 III. PRELIMINARY WORK 6 IV. ALTERNATE SWITCH CONFIGURATIONS STUDIED 7 V. COMMERCIAL STRIPLINE SWITCH EVALUATION 8 VI. NBS STRIPLINE SWITCH 13 VII. CLASSICAL MERCURY SWITCH PULSE GENERATOR 16 VIII. CONCLUSIONS 17 REFERENCES 18 LIST OF FIGURES Figure Page 2-1 Diode switch flat pulse generator 21 2- 2 Mercury switch flat pulse generator 21 3- 1 Basic SPDT microminiature mercury wetted switch 22 3-2 DIP IC mercury switch pulse generator 23 3-3 Transition time measurement set-up 24 3-4 Transient step response of measurement set-up. Hori- zontal scale is 100 ps/div. 24 3- 5 Pulse output from DIP IC mercury switch pulse generator. Horizontal scale is 200 ps/div. 25 4- 1 Microminiature mercury switched mounted in a 14 mm insertion unit 26 4- 2 Pulse output of a microminiature switch mounted in a 14 mm insertion unit. Horizontal scale is 100 ps/div.- 26 5- 1 Microminiature mercury switch in commercial strip line package 27 5-2 TDR characteristics of commercial stripline micro- miniature mercury switch, (a) Port 2 to Port 1.
    [Show full text]
  • TURBINE PROTECTION SYSTEM PERFORMANCE by Margaret C
    TURBINE PROTECTION SYSTEM PERFORMANCE by Margaret C. Campbell Project Engineer Foster-Miller, Incorporated Waltham, Massachussetts based control, the majority of the installed turbine protection As a Project Mechanical Engineer with systems rely on the high pressure pneumatic EHC system. To Foster-Miller,Incorporated, in Waltham, supplement the protection afforded by the this system, most Massachusetts, Margaret C. Campbell suppliers also provide a comprehensive package of turbine provides engineering and managerial sup­ supervisory instrumentation (TSI) systems. These TSI systems port to power industry related programs. can be designed, at the request of the customer, to initiate pro­ Her work has included reliability studies of tective actions. nuclear turbine protection systems,design Power plant experience indicates that the turbine protection of pneumatic systems fo r robotic controls, systems often initiate turbine trips when operating conditions and designof innovative naturalgas piping do not warrant a trip. In Table 1, the Institute of Nuclear Power systems. Operations (INPO) reports the listing of subsystems and compo­ Before joining Foster-Miller, Ms. Camp­ nents that are typically associated with turbine trip events [2]. bell was employed with Stone and Webster Engineering Corpora­ tion,where she was a Systems engineer involved in such activities Table 1. Subsystems and Components TypicallyAssociated with as the startup of auxiliary boilers and associated systems at the Thrbine Trip Events. Millstone III Nuclear Power Plant. Percent ofTotal Ms. Campbell received a B.S.M.E. degree in 1982,from the Subsystem Turbine Trip Events University of Massachusetts. EHC System 47 Governor/Control Valves 9 Intercept/StopValves 6 ABSTRACT Instruments 5 The need to protect a turbine generator from abnormal Pressure Regulator 5 operating condidtions is a given.
    [Show full text]
  • HG Series Mercury Displacement Relay User's Manual
    HG Series Mercury Displacement Relay User’s Manual ISO 9001 Registered Company Winona, Minnesota USA Power Controls Watlow Controls, 1241 Bundy Blvd., P.O. Box 5580, Winona, MN, USA 55987-5580, Phone: (507) 454-5300, Fax: (507) 452-4507 WMDR-XUMN-1097 June 1997 Made in the U.S.A. Supersedes: WMDR-XUMN Rev A00 Printed on Recycled Paper 10% Postconsumer Waste Dimensions 30 Amp Models All 35, 50, and 60 Amp Models HG30-XKDX-0000 “A” Pressure Dimensions Connectors 1 Pole HG35-XLDX-0000 4.62 (117) #4-14 A.W.G. #8-32 HG50-XMDX-0000 4.62 (117) #4-14 A.W.G. Binding Head HG60-XPDX-0000 5.12 (130) #1 - 8 A.W.G. Screw NOTE: #10-#14 2.00 A.W.G. 3.58 Watlow recom- 1 Pole (51) (91) Dia. mends that ring ter- Pressure minal lugs be used 2.00 Connector 1.63 1.94 (51) (41) (49) with stranded wire on all binding head .21 (5) screw terminals. Dia. 1.19 2.25 Mounting (30) (57) Hole "A" 1.63 1.94 (41) (49) 2 Pole #8-32 Binding Head Screw #10-#14 A.W.G. .20 (5) 1.19 2.25 Dia. Mtg. (30) (57) Hole 4.00 (102) .21 (5) 2 Pole Wide Slot 1.94 2.65 For #10 (49) (67) Pressure Screw Connector Hole 40° Typ. .21 (5) Dia. 3.13 2.62 Mounting (79) (67) Hole 4.00 .21 (5) "A" (102) Wide Slot 1.94 For #10 (49) Screw 2.65 Hole (67) 3 Pole 40° Typ.
    [Show full text]
  • 3. Relays Contents
    3. Relays Contents 1 Relay 1 1.1 Basic design and operation ...................................... 1 1.2 Types ................................................. 2 1.2.1 Latching relay ......................................... 2 1.2.2 Reed relay ........................................... 3 1.2.3 Mercury-wetted relay ..................................... 3 1.2.4 Mercury relay ......................................... 3 1.2.5 Polarized relay ........................................ 4 1.2.6 Machine tool relay ...................................... 4 1.2.7 Coaxial relay ......................................... 4 1.2.8 Time delay .......................................... 4 1.2.9 Contactor ........................................... 4 1.2.10 Solid-state relay ........................................ 4 1.2.11 Solid state contactor relay ................................... 5 1.2.12 Buchholz relay ........................................ 5 1.2.13 Forced-guided contacts relay ................................. 5 1.2.14 Overload protection relay ................................... 6 1.2.15 Vacuum relays ........................................ 6 1.3 Pole and throw ............................................. 6 1.4 Applications .............................................. 7 1.5 Relay application considerations .................................... 8 1.5.1 Derating factors ........................................ 9 1.5.2 Undesired arcing ....................................... 9 1.6 Protective relays ...........................................
    [Show full text]
  • HOUSE BILL No. 4281 No
    HOUSE BILL No. 4281 HOUSE BILL No. 4281 February 17, 2009, Introduced by Reps. Warren, Scripps, Lisa Brown, Byrnes, Liss, Miller, Smith, Robert Jones, Switalski, Roberts and Dean and referred to the Committee on Great Lakes and Environment. A bill to amend 1994 PA 451, entitled "Natural resources and environmental protection act," by amending section 17201 (MCL 324.17201), as amended by 2006 PA 494, and by adding sections 17210, 17215, and 17217. THE PEOPLE OF THE STATE OF MICHIGAN ENACT: 1 Sec. 17201. As used in this part: 2 (a) "Appliance" means a refrigerator, dehumidifier, freezer, 3 oven, range, microwave oven, washer, dryer, dishwasher, trash 4 compactor, window room air conditioner, television, or computer. 5 Appliance does not include a home heating or central air- 6 conditioning system. 7 (b) "Manufacturer" means a person that produces, imports, or 8 distributes mercury thermometers MERCURY-ADDED PRODUCTS in this HOUSE BILL No. 4281 00825'09 TMV 2 1 state. 2 (c) "Mercury fever thermometer" means a mercury thermometer 3 used for measuring body temperature. 4 (D) "MERCURY RELAY" MEANS A MERCURY-ADDED PRODUCT THAT OPENS 5 OR CLOSES ELECTRICAL CONTACTS TO AFFECT THE OPERATION OF ANOTHER 6 DEVICE IN THE SAME OR ANOTHER ELECTRICAL CIRCUIT AND INCLUDES, BUT 7 IS NOT LIMITED TO, A MERCURY DISPLACEMENT RELAY, A MERCURY WETTED 8 REED RELAY, A MERCURY CONTACT RELAY, AND A MERCURY CONTACTOR. 9 (E) "MERCURY SWITCH" MEANS A MERCURY-ADDED PRODUCT THAT OPENS 10 OR CLOSES AN ELECTRICAL CIRCUIT OR GAS VALVE AND INCLUDES, BUT IS 11 NOT LIMITED TO, A MERCURY FLOAT SWITCH ACTUATED BY RISING AND 12 FALLING LIQUID LEVELS, A MERCURY TILT SWITCH ACTUATED BY A CHANGE 13 IN PRESSURE, A MERCURY TEMPERATURE SWITCH ACTUATED BY A CHANGE IN 14 TEMPERATURE, AND A MERCURY FLAME SENSOR.
    [Show full text]
  • Effect of Inductance and Requirements for Surge Current Testing of Tantalum Capacitors
    NASA Electronic Parts and Packaging Program (NEPP) Reliability of Tantalum Capacitors Effect of Inductance and Requirements for Surge Current Testing of Tantalum Capacitors Alexander Teverovsky QSS Group, Inc. Code 562, NASA GSFC, Greenbelt, MD 20771 [email protected] October 2005 Abstract. Surge current testing is considered one of the most important techniques to evaluate reliability and/or screen out potentially defective tantalum capacitors for low- impedance applications. Analysis of this test, as it is described in the MIL-PRF-55365 document, shows that it does not address several issues that are important to assure adequate and reproducible testing. This work investigates the effect of inductance of the test circuit on voltage and current transients and analyzes requirements for the elements of the circuit, in particular, resistance of the circuit, inductance of wires and resistors, type of switching devices, and characteristics of energy storage bank capacitors. Simple equations to estimate maximum inductance of the circuit to prevent voltage overshooting and minimum duration of charging/discharging cycles to avoid decreasing of the effective voltage and overheating of the parts during surge current testing are suggested. I. Introduction. High current spikes caused by power supply transients might result in short-circuit failures of tantalum capacitors and cause catastrophic consequences for electronic systems, including igniting the system. The probability of this type of failure is especially high for low-impedance circuits when inrush currents are limited mostly by the impedance of the capacitor itself [1]. Recently, these problems have gained yet more importance due to proliferation of distributed- power architecture systems and low-voltage DC-DC converters.
    [Show full text]
  • Minimizing Short-Circuit Current Amplitude and Pulse Width When Hot-Swap Controller Output Is Shorted
    Maxim > Design Support > Technical Documents > Application Notes > Circuit Protection > APP 2694 Maxim > Design Support > Technical Documents > Application Notes > Hot-Swap and Power Switching Circuits > APP 2694 Keywords: hot-swap, minimizing short-circuit, hot swap controller, current amplitude, short circuit, current spike APPLICATION NOTE 2694 Minimizing Short-Circuit Current Amplitude and Pulse Width When Hot-Swap Controller Output is Shorted Sep 11, 2003 Abstract: When a hot-swap controller's output is short circuited, the internal circuit-breaker function trips to open the circuit. But initial current flow may be several hundred amps before the internal circuit breaker responds. Typical hot-swap controller circuit-breaker delay time may be 200–400ns, and gate turn-off time may be 10-50microseconds due to limited gate pull-down current. Meanwhile, a high short- circuit current flows. A simple external circuit, described in the application note, can minimize the initial current spike and terminate the short circuit in 200–500ns. Typical Hot-Swap Circuit Let's look at a typical +12V 6A hot-swap control circuit using the MAX4272 (Figure 1). Examining the MAX4272 specifications, we see that it contains slow and fast comparators with trip thresholds of 50mV and 200mV, respectively (43.5–56mV and 180–220mV tolerances over temperature). Applying a 1.5–2.0 multiplier usually placed on operating-current to trip-current ratio, we select RSENSE = 5mΩ. Allowing for a 5% tolerance on RSENSE, the trip current range would be 8.28–11.76A for the slow comparator for overload conditions, and 34–46.2A for the fast comparator when a short occurs.
    [Show full text]
  • " at MICROWAVE FREQUENCIES " a Thesis Submitted For
    " STUDY OF THE VISCOELASTIC PROPERTIES OF LIQUIDS " " AT MICROWAVE FREQUENCIES " A thesis submitted for the degree of Doctor of Philosophy, by Herb Joseph John Seguin Electrical Engineering Department, Imperial College of Science and Technology University of London November,1963. 2 ABSTRACT The development of an " S " band system for use in viscoelastic relaxation investigations in liquids at high frequencies is discussed. The experimental microwave ultrasonic system ,operating at a frequency of 3000 meagacycles per second , employed piezo- electric single quartz crystals,operating in a nonresonant, surface excitation mode, as the electromechanical transducers. The real and imaginary components of the shear mechanical impedance,of various test liquids , were obtained from measure- ments of the relative amplitude and phase change of an acoustic decay pattern,initiated within the quartz crystal by pulse excitation, upon application of the test liquid to the crystal surfaces. Theoretical and practical measurement accuracies of the apparatus are investigated, along with the limitations of the system as a tool in the studies of the fundamentals of the liquid state. Possible avenues of improvement are suggested as are possible extensions of the basic system design to the higher microwave frequency spectrum. 3 ACKNOWLEDGMENTS The author wishes to express deepest thanks and appreciation to Professor J. Lamb and Dr. J. Barlow for the original presentation of the project and for continued guidsnce,assistance and encouragement, throughout this work. The author is also indebted to Mr. J. Collins for continued interest and assistance in the design and development of the experimental system . Sincere appreciation is expressed to Mr.J. Ritcher for help in the theoretical acoustic aspects of the project.
    [Show full text]