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Topic: Transient voltage suppression diode

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	Transient voltage suppression system - Patent 4271446
		Transient voltages are produced in electrical circuits by such events as relay switching, motor commutator cycling, contact arching, and in generally any repetitious on/off cycling events.
		Transient voltage suppression is generally achieved with the use of various types of voltage clamping devices which are coupled either between the power lines of a system, between the power lines and a neutral or ground line, or both.
		If the transient voltage which causes the first device to conduct increases, the temperature of the device also increases and when a certain temperature level is reached, the switching resistor thermally coupled to the first device becomes substantially non-conductive so that no further transient voltage or current can be applied to the first device.
	www.freepatentsonline.com /4271446.html (2962 words)

	Lighting apparatus for projector invention
		The transient voltage suppression circuit is used for transmitting the lighting signal to the lamp driver and attenuating the high transient voltage generated from the lamp driver when the lamp driver lights up the lamp.
		The transient voltage suppression circuit 23 is disposed between the control module 22 and the lamp driver 24 and used for receiving the lighting signal output from the control module 22 and outputting the lighting signal to the lamp driver 24.
		Thereafter, the voltage difference between the emitter and the collector of the transistor Q1 is a constant close to 0 volt via the suppression circuit 232 and by choosing the proper resistor R3 and controlling the input voltage Vin of the resistor R3.
	www.freshpatents.com /Lighting-apparatus-for-projector-dt20060907ptan20060197468.php (1444 words)

	Low-voltage punch-through bi-directional transient-voltage suppression devices having surface breakdown protection and ...
		The bi-directional transient voltage suppression device of claim 1, wherein said oxide layer is a thermally grown oxide layer.
		The bi-directional transient voltage suppression device preferably comprises a p++ semiconductor substrate, a first p+ epitaxial layer adjacent the p++ substrate, an n epitaxial layer adjacent the first epitaxial p+ layer, and a second p+ epitaxial layer adjacent the n epitaxial layer.
		Viewing the bi-directional transient-voltage suppression device of the present invention as a pnp transistor, it is seen that the base region (i.e., the n region) becomes wider at the silicon oxide interface.
	www.freepatentsonline.com /6600204.html (5757 words)

	Transient suppression techniques
		Relay coil suppression with DC relays When an electromechanical relay is de-energized rapidly by a mechanical switch or semiconductor, the collapsing magnetic field produces a substantial voltage transient in its effort to disperse the stored energy and oppose the sudden change of current flow,...,
		Transient Voltage Suppressors (TVS’s) are devices used to protect vulnerable circuits from electrical overstress such as that caused by electrostatic discharge, inductive load switching and induced lightning,
		Transient Voltage Suppression Diode Circuits Transient Voltage Suppression Diode Circuits, Transient Voltage Suppression (TVS) diodes provide a simple solution to increase the EMI and ESD immunity level of a circuit and only a few guidelines must be followed to provide effective surge protection.
	www.educypedia.be /electronics/Transientsuppression.htm (432 words)

	Crouzet Solid State Relay Knowledge Base - Transient Protection
		MOV's are a commonly used transient suppressor, which are typically configured in a circuit to shunt energy to ground/neutral, or directly across the device being protected.
		As the voltage begins to exceed the nominal rating of the MOV, the diode junctions break down because of the avalanche effect and allows a large amount of current to flow.
		A transient voltage suppression diode is a device used to protect sensitive electronics, such as Microprocessors and Opto couplers, from voltage spikes carried on connected wires.
	solid-state-relay.crouzet-usa.com /kb/ssr_kb_transient.shtml (1157 words)

	Diode - ExampleProblems.com
		Diodes may be made from semiconductor materials such as silicon or germanium or may be fabricated using devices depending on thermionic emission: tubes (US) (or valves in UK).
		The first diodes were vacuum tube devices (also known as thermionic valves), arrangements of electrodes surrounded by a vacuum within a glass envelope, similar in appearance to incandescent light bulbs.
		A semiconductor diode's current-voltage, or I-V, characteristic curve is ascribed to the behavior of the so-called Depletion Layer or Depletion Zone which exists at the p-n junction between the differing semiconductors.
	www.exampleproblems.com /wiki/index.php/Diode (2951 words)

	Diode - Engineering (Site not responding. Last check: )
		The first diodes were vacuum tube devices (also known as thermionic valves), arrangements of electrodes surrounded by a vacuum within a glass envelope, similar in appearance to incandescent light bulbs.
		In vacuum tube diodes, a current is passed through the cathode, a filament treated with a mixture of barium and strontium oxides, which are rare earth metals.
		A semiconductor diode's current-voltage, or I-V, characteristic curve is ascribed to the behavior of the so-called depletion layer or depletion zone which exists at the p-n junction between the differing semiconductors.
	engineering.wikia.com /wiki/Diode (2860 words)

	Diode - Wikipedia, the free encyclopedia
		Thermionic diodes are vacuum tube devices (also known as thermionic valves), which are arrangements of electrodes surrounded by a vacuum within a glass envelope, similar in appearance to incandescent light bulbs.
		In vacuum tube diodes, a current is passed through the cathode, a filament treated with a mixture of barium and strontium oxides, which are oxides of alkaline earth metals.
		For special purpose diodes like the avalanche or zener diodes, the concept of PIV is not applicable since they have a deliberate breakdown beyond a known reverse current such that the reverse voltage is "clamped" to a known value (called the zener voltage or breakdown voltage).
	www.wikipedia.org /wiki/Diode (2975 words)

	NationMaster - Encyclopedia: Diode
		The simplest of these, the germanium point-contact diode, dates from the early days of radio, when the received radio signal was detected by means of a germanium crystal and a fine, pointed wire that rested on it.
		In modern germanium (or silicon) point-contact diodes, the wire and a tiny crystal plate are mounted inside a small glass tube and connected to two wires that are fused into the ends of the tube.
		The Zener diode is a special junction-type diode, using silicon, in which the voltage across the junction is independent of the current through the junction.
	www.nationmaster.com /encyclopedia/Diode (680 words)

	Diode - Wikipedia, the free encyclopedia
		Most modern diodes are based on semiconductor p-n junctions.
		Schottky diodes are majority carrier devices and so do not suffer from minority carrier storage problems that slow down most normal diodes.
		Cat's whisker diodes were also called crystal diodes and found application in crystal radio receivers.
	www.sciencedaily.com /encyclopedia/diode (2975 words)

	ipedia.com: Diode Article (Site not responding. Last check: )
		A special arrangement of four diodes that will transform an alternating current into a direct current, using both positive and negative excursions of a single phase alternating current, is known as a diode bridge, single-phase bridge rectifier, or simply a full wave rectifier.
		The first diodes were vacuum tube devices (also known as thermionic valves), arrangements of electrodes surrounded by a vacuum within a glass envelope, similar in appearance to incandescent light bulbs.
		The arrangement of a filament and plate as a diode was invented in 1904 by John Ambrose Fleming, scientific adviser to the Marconi company, based on an observation by Thomas Edison.
	www.ipedia.com /diode.html (2175 words)

	Transient voltage suppression diode - Wikipedia, the free encyclopedia
		The device can be represented by two mutually opposing zener diodes in series with one another connected in parallel with the circuit to be protected.
		The device operates by shunting excess current when the induced voltage exceeds the zener breakdown potential.
		Another method for transient suppression is the varistor.
	www.sciencedaily.com /encyclopedia/transient_voltage_suppression_diode (130 words)

	Diode Summary
		Thermionic diodes are vacuum tube devices (also known as thermionic valves), which are arrangements of electrodes surrounded by a vacuum within a glass envelope, similar in appearance to incandescent light bulbs.
		In vacuum tube diodes, a current is passed through the cathode, a filament treated with a mixture of barium and strontium oxides, which are oxides of alkaline earth metals.
		Their forward voltage drop at forward currents of about 1 mA is in the range 0.15 V to 0.45 V, which makes them useful in voltage clamping applications and prevention of transistor saturation.
	www.bookrags.com /Diode (4481 words)

	Varistor (Site not responding. Last check: )
		If the size of the transient pulse (often measured in joule s) is too high, the device may melt, or otherwise be damaged.
		Another method for suppressing voltage spikes is the transient voltage suppression diode (TVS).
		Another transient voltage supression device is the gas discharge tube, which unfortunately, has a much higher break down voltage, but also a much much higher carring capicity, and can withstand multiple high voltage hits (i.e., from lightning) without significant degradation.
	www.serebella.com /encyclopedia/article-Varistor.html (463 words)

	Fire Suppression Equipment (Site not responding. Last check: )
		Transient voltage suppression diode 4: A '''transient voltage suppression diode''' is a device used to protect sensitive 6: Another method for transient suppression is the varistor.
		Bone marrow suppression 1: '''Bone marrow suppression ''' is a serious side effect of chemotherapy a 3: his process is slowed or stopped when bone marrow suppression is caused.
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	www.elusiveeye.com /side7472-fire-suppression-equipment.html (795 words)

	Station Information - Transient voltage suppression diode
		A transient voltage suppression diode is a device used to protect sensitive electronics from voltage spikes induced on connected wires.
		The device can be represented by two mutually opposing zener diodes in series with one another connected in parallel with the circuit to be protected.
		Another method for transient suppression is the varistor.
	www.stationinformation.com /encyclopedia/t/tr/transient_voltage_suppression_diode.html (93 words)

	EDN Access--04.10.97 Solve transient-protection problems with devices and topology
		Voltage transients are abnormally high pulses of voltage that exceed the circuit’s normal operating voltage.
		During a transient event, the transient current is shunted through the device, resulting in a lower transient voltage across the protected circuit.
		The TVS diode’s fast reaction and low clamping ability allow the diode to shunt the surge current with a maximum clamping voltage less than the transformer-saturation point, which is typically less than 50V.
	www.edn.com /archives/1997/041097/08df_05.htm (3284 words)

	Diodes Basics (Site not responding. Last check: )
		a positive voltage is applied to the cathode with respect to the anode, an electric field is formed between the cathode and anode specifically across the depletion region.
		For the diode to switch OFF, the charge carriers must either recombine (minority) or be removed, the latter mechanism appearing as a reverse current (reverse recovery) flowing in the diode as it turns OFF.
		Diodes are not only supplied as single components but can be purchased in modules such as single and three phase rectifiers.
	www.powerdesigners.com /InfoWeb/design_center/articles/Diodes/diodes.shtm (1614 words)

	diode information site (Site not responding. Last check: )
		When the diode is reverse-biased, the charge carriers are pulled away from the center of the device, creating a depletion region.
		As the potential difference is increased, at some stage the diode will become conductive and allow current to flow, at which point it can be thought of as a connection with zero (or at least very low) resistance.
		Avalanche diodes: diodes that conduct in the reverse direction when the reverse bias voltage exceeds the breakdown voltage.
	www.mistyped.info /diode.htm (2232 words)

	Transient Voltage Surge Suppressors: not all alike: News from Advance Electronics
		In essence, a Transient Voltage Surge Suppressor (TVSS) is a component that limits the amount of energy arising from a transient and, as a result, protects electrical equipment from damage.
		SADs are semiconductors that can respond very rapidly to a transient voltage surge, and can be specified with clamping voltages that range from a few volts to several hundred.
		However, because their clamping voltage needs to be as close as possible to the peak value of the mains supply, it is necessary to use a number of SADs, so that the transient energy can be dissipated without sacrificing the device.
	www.engineeringtalk.com /news/agk/agk136.html (1541 words)

	Transient Waveforms
		The arc voltage is maintained until there is insufficient current to maintain the arc, after which the voltage at the gas tube rises again, and then decays.
		In this condition, the transient suppression diode would have to be capable of withstanding the pulse current for the entire transient duration.
		Once the diode voltage and series resistance are estimated, the specified transient can be applied, and peak power and current ratings of the diode and gas tube arrived at using the tool.
	www.emc-software.emc-resources.co.uk /transient%20waveforms.htm (2007 words)

	Power Supply Design: Snubber Design
		Original Question: In clamp and snubber circuits for flybacks, to reduce voltage spikes at switch-off in the MOSFET drain, the common practice consists of a diode and a resistor paralleled to a capacitor.
		When a failure report comes back on a transistor or capacitor with the usual electrical voltage overstress reason, you can show the circuit schematic with the transient suppression diode and force a more competent failure analysis of the part.
		You need to use a fast-acting transient suppression diode, not your normal zener diode for this application, whose clamping action is too slow.
	www.smpstech.com /mtblog/snubber_design.html (605 words)

	CSD - April 1999 - Feature: Protecting High-Speed Communications Interfaces
		Transient voltages are randomly occurring “spikes” or pulses of voltage with an amplitude much higher than the normal operating voltage of the circuit.
		While transient voltages can be generated in a variety of ways, lightning and static discharge are the two most common threats to communications equipment.
		As a rule, the closer the transient suppression element is to the device it is protecting, the better its clamping characteristics must be.
	www.commsdesign.com /main/1999/04/9904feat4.htm (2249 words)

	MOV or SASD Ã¢ÂÂ” Which Surge Suppressor is Right for You
		The resistance of an MOV is nonlinear and decreases as voltage magnitude increases.
		Transient overvoltages can be caused by external disturbances, such as lightning, or a wide variety of system and load-switching operations.
		UL 1449 defines transient voltage surge suppressors (TVSSs) or surge protection devices (SPDs) as equipment intended for electrical connection on the load side of the main overcurrent protection, in circuits not exceeding 600V rms.
	powerquality.com /mag/power_mov_sasd_surge (2059 words)

	Varistor in TutorGig Encyclopedia
		Varistors are often used to protect circuits against excessive transient voltages by incorporating them into the circuit in such a way that, when triggered, they will shunt the current created by the high voltage away from the sensitive components.
		If the size of the transient pulse (often measured in joules) is too high, the device may melt, burn, vaporize, or otherwise be damaged or destroyed.
		Another transient voltage suppression device is the gas discharge tube which, unfortunately, has a much higher breakdown voltage, but also a very much higher current capacity, and can withstand multiple high-voltage hits (for example, from lightning) without significant degradation.
	www.tutorgig.com /ed/varistor (492 words)

	Electronic Products
		Maximum transient threshold should be set low enough to allow the use of lower peak-voltage-rated transistors in the power-switching section.
		Since transient suppressors are not intended for continuous operation above their working voltage or in the clamping region, overcurrent protection may be required for line or load faults.
		An example is the ac adapter, which is subject to transients, requiring as much as 25 J of energy dissipation and short branch industrial-circuit power supplies and converters, which may require additional power absorption.
	www.electronicproducts.com /print.asp?ArticleURL=AUGLTL1.AUG2003 (766 words)

	Howstuffworks "Doping Silicon: Diodes and Transistors"
		The diode simply blocks any current from leaving the battery if it is reversed -- this protects the sensitive electronics in the device.
		Usually, the breakdown voltage is a lot more voltage than the circuit will ever see, so it is irrelevant.
		This voltage is needed to start the hole-electron combination process at the junction.
	computer.howstuffworks.com /diode1.htm (953 words)

	Transient voltage suppression diode
		A silicon transient suppression diode, or metal oxide varistor switches rapidly, but may have peak voltage and total energy ratings below those produced by the transient.
		When a failure report comes back on a transistor or capacitor with the usual electrical voltage overstress reason, you can show the circuit schematic with the transient suppression diode and force a...
		TVS Diode (Transient Voltage Suppression Diode) – An avalanche diode designed to handle moderate to high current, a limiting device.
	www.logicjungle.com /wiki/Transient_voltage_suppression_diode (290 words)

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