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Topic: Voltage spike

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	Voltage spike - Wikipedia, the free encyclopedia
		Voltage spikes are fast, short duration surges (overvoltages) in the electric potential in a given circuit.
		The effect of a voltage spike is to produce a temporary increase in current flow.
		While generally referred to as a voltage spike, the phenomenon in question is actually a power spike, in that it is measured not in volts but in joules.
	en.wikipedia.org /wiki/Voltage_spike (246 words)

	Voltage spike -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-25)
		Voltage spikes are fast, short duration surges in the (The difference in electrical charge between two points in a circuit expressed in volts) electric potential in a given (An electrical device that provides a path for electrical current to flow) circuit.
		The effect of a voltage spike is to produce a temporary increase in (A steady flow (usually from natural causes)) current flow.
		In (A substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities) semiconductor junctions, the voltage may exceed the reverse breakdown potential, thus destroying or severely weakening the device.
	www.absoluteastronomy.com /encyclopedia/v/vo/voltage_spike.htm (224 words)

	Voltage spike (Site not responding. Last check: 2007-10-25)
		Voltage spikes are fast, short duration surges in the electric potential in a given electrical network.
		While technically, the pulse produced by an nuclear fission or nuclear fusion detonation produces a voltage spike, these rare events are commonly referred to as an electromagnetic pulse (EMP).
		The effect of a voltage spike is to produce a temporary increase in electric current flow.
	read-and-go.hopto.org /Electronics-terms/Voltage-spike.html (214 words)

	Arrangement for displaying operation of booster circuit for flash device camera - Patent 4942340
		Accordingly, the inverse spike voltage generated between the sides A and K of the high voltage rectifier diode 9 is also applied to both ends of a series connected part consisting of the other high voltage rectifier diode 8 and the neon lamp 10.
		The spike voltage is divided by the ratio of the reverse impedance of the diode 8 to the impedance of the neon lamp 10.
		The inversely generated spike voltage of a major portion S2 of the secondary winding is blocked by the high voltage rectifier diode 219 to prevent the main capacitor 222 from being over-charged and also to prevent the outflow of the accumulated electric charge.
	www.freepatentsonline.com /4942340.html (4844 words)

	Digital signal fault detector - Patent 4965800
		The predetermined spike times 31, 37 will vary depending on the application and may be defined after consideration of a number of factors, including the normal operating speed of the circuit and the probability of a normal signal occurring with a duration less than the predetermined spike times 31, 37.
		Accordingly, the input signal 20 is compared with the threshold voltage A in the comparator 41, and simultaneously compared with the threshold voltage B in the comparator 42.
		If, however, the high spike time 31 has not been exceeded, a voltage spike has been detected and the decision block 56 moves the detector to block 58 wherein the existence of a high spike is communicated to the user.
	www.freepatentsonline.com /4965800.html (14937 words)

	IDX Carwash Products: Acceptors, Tokens, Timers, Displays, Meter Boxes, Signs
		Voltage spikes are very brief disturbances that are very dangerous for your electronic equipment because the voltage values may reach thousands of volts...
		A voltage spike of a thousand volts lasting for only about a millisecond or so would not be an uncommon thing to be generated when switching off a solenoid.
		The showering arc is caused by a relaxation oscillator effect due to the inductance of the load, stray circuit capacitance, and the non-linear characteristics of the air gap during electrical breakdown for the arc.
	www.idxinc.com /carwash/AppNote101.htm (854 words)

	electrical faults,voltage variations,voltage spikes,harmonic distortions,spike suppressors,electrical stabilisation
		Furthermore, this limit is often exceeded due to “slow variations” (voltage drops caused by underdimensioned lines and/or overloads), “overvoltages” (considerable increases in the line value arising when industries drastically cut down their energy consumption), “fast variations” (drops caused by the connection of equipment such as: discharge lamps, punching machines, electric motors etc.).
		They are caused, not only by the switching of high voltage lines, connection of power factor correction capacitors, lightening, and the cutting off of loads with high reactive powers, but also by limited power loads such as photocopiers and air conditioners connected to the same line that feeds the sensitive equipment.
		Spikes are not detectable by means of an ordinary voltmeter given their brief duration; however they are one of the main causes of faults and malfunctions.
	www.elipse-power.com /irem/faults.htm (726 words)

	Blocking circuit for high voltage spike testing - US Patent 6490143 (Site not responding. Last check: 2007-10-25)
		The high-frequency voltage spikes are classified as line-to-line (i.e., from power line to another power line) or line-to-ground (i.e., running from power line to ground).
		Spike tolerance test circuitry includes power frequency blocking circuits that provide low impedance at the higher spike frequencies and limit the power dissipated by the power source through the power frequency blocking circuitry.
		To ensure that the load is capable of withstanding the spikes, a spike generator is connected to the equipment under test through power frequency blocking circuitry.
	www.patentstorm.us /patents/6490143.html (2474 words)

	Spike-and-wave neocortical patterns in rats: genetic and aminergic control.
		Spontaneously occurring and drug-induced high voltage spike-and-wave electroencephalogram patterns were examined in inbred rats of the Fischer 344 and Buffalo strains and of the random-bred Sprague-Dawley strain at different ages.
		High voltage spike-and-wave episodes were present in 87.5% of the 3-month-old and in 100% of the older Fischer 344 rats.
		High voltage spike-and-wave episodes were completely absent in 3-month-old Buffalo and Sprague-Dawley animals but could be induced by systemic injection of pentylenetetrazol and at an older age they appeared in 58.3% (12-month) and 71.4% (greater than 26-month) of the subjects of these strains.
	www.arclab.org /medlineupdates/abstract_2263319.html (372 words)

	Lee presents Spike & Hold Circut... Pre-Packaged
		Standard VHS valves require the spike voltage (sometimes referred to as pulse voltage) for 0.30 ms to open the valve.
		The specific minimum spike time, spike voltage and hold voltage is specified on the inspection drawing (available from The Lee Company) for each valve.
		After the spike period, the circuit turns off the spike voltage and leaves the hold voltage energized for as long as the control signal remains high.
	www.theleeco.com /EFSWEB2.NSF/4c8c908c6ad08610852563a9005dae17/10d4919f06c450b385256cd9006fc82c!OpenDocument (509 words)

	Active pull-up voltage spike reducer - US Patent 5525926 (Site not responding. Last check: 2007-10-25)
		producing a voltage spike reducer enabling pulse that is responsive to a pulse generator output signal, said pulse generator output signal being responsive to a pulse generator input signal that is combined with a delayed, inverted pulse generator input signal, said voltage spike reducer enabling pulse being gated by a regulated power supply; and
		The method as recited in claim 1, wherein said spike reducer enabling pulse is sufficient in time duration to provide sufficient current from said unregulated power source during a period of time the integrated circuit is demanding more current than said regulated power source can supply to maintain circuit speed.
		This invention relates to a CMOS voltage spike reducing circuit formed in a semiconductor integrated circuit (IC) and in particular a voltage spike reducing circuit that may be used in memory devices, such as dynamic random access memories (DRAMs).
	www.patentstorm.us /patents/5525926.html (1728 words)

	STMicroelectronics \| CONTROLLING VOLTAGE TRANSIENTS IN FULL BRIDGE DRIVERS APPLICATIONS
		After the voltage spike on the power supply was eliminated, the tran-sients on the output must be related to the mismatch of switching times between the diodes and power transistors.
		Using the RC snubbing circuit shown in figure 9, the rate of change of the voltage on the output is dominated by the capacitor while the resistor is used primarily to limit the peak current flowing through the power transistor when it turns on.
		As shown in figure 8, the power supply voltage, the voltage across each of the DMOS transistors and the voltage across the output of the bridge (Vout1 - Vout2) are all within the maximum rating of the device with some margin.
	www.st.com /stonline/books/ascii/docs/1703.htm (2103 words)

	[No title] (Site not responding. Last check: 2007-10-25)
		Surge protector and noise filtration devices, variously known as voltage spike protectors or voltage surge and noise suppressors, are well known and in widespread use.
		The in-line base power feed integral surge and spike protector 10 is commonly used in new construction for cubicle clusters that have a portion adjacent to a wall 26 through which the building power supply system 24 may be routed.
		The higher the value of the clamping voltage, the higher the level of the voltage surge which will be passed by the surge suppression circuit.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/15298.010301&ELEMENT_SET=DECL (4626 words)

	Re: voltage spike suppression; rectifier diodes
		When the reverse polarity spike is generated by opening the circuit, the reverse voltage causes the diode to conduct, and clamp the voltage to approximately 0.7 volts 'negative'.
		With this scheme they are using the low impedance of the main DC bus to essentially swamp out and absorb the high voltage spike created by the inductive load.
		The PIV rating (Peak Inverse Voltage) will need to be high enough to block your main bus voltage (12V or 24V) as this is what the diode will see in normal operation while it is reverse biased, plus some safety factor.
	archives.glastar.org /0207/msg00194.html (609 words)

	RX-7 Owners Club - Something causing a voltage spike, killing alternator and draining battery
		-to me, it looked like a voltage spike and apparently, something involved with it is murdering my alternators and killing the battery off.
		Your missing the excitation voltage at the small plug on the rear of the alternator.
		What is happening is that the alternator when spinning at a high speed is creating its own field voltage which is why you then see the 14 volts THEN but not at idle speeds.
	www.rx7club.com /showthread.php?t=380860 (853 words)

	Selectronix UK - New products
		Positive and negative voltage spikes can often occur on a SCSI signal line during hot swapping (the adding or removing of devices while the system is operational).
		Simply plug the Voltage Spike Suppressor in-line between the controller chip and the source of the transient voltage spikes.
		The Voltage Spike Suppressor is a fully shielded device with low static power consumption, no external power requirements, and no SCSI ID requirements.
	www.selectronix.co.uk /news.asp?NewsID=19&CatID=3 (201 words)

	Is Spontaneous High-Voltage Rhythmic Spike Discharge in Long Evans Rats an Absence-Like Seizure Activity? -- Shaw 91 ...
		spike was accompanied by a longer ISI (Fig.
		In addition, a single or oligo high-amplitude spike was usually followed by a group of small-amplitude spikes during a HVRS discharge.
		Averaged ISIs of the initial and final 5 spikes of HVRS discharges were 99.4 and 111.4 ms, respectively.
	jn.physiology.org /cgi/content/full/91/1/63 (5905 words)

	Gryphon, Inc. - Surge Suppressors vs. Power Conditioners (Site not responding. Last check: 2007-10-25)
		The 120v is the average of a voltage sine wave that peaks at 170 volts positive and negative.
		A spike that occurs at the top of the sine wave will be limited to 204v-170v or a maximum of 34v.
		Therefore, as a worst case, the energy from the voltage spike between 204v and possibly 6000v can be dumped onto the ground wire.
	www.gryphon-inc.com /tech2.htm (626 words)

	The Motor Power Control (Site not responding. Last check: 2007-10-25)
		So the power control circuit would have to generate a voltage spike in synchronization with the AC lines at a phase determined by the amount of power required by the motor.
		Once the voltage on the capacitor increases to the necessary firing voltage of the UJT it will cause a decrease in the resistance across the UJT terminals, this will cause a current spike.
		To determine the firing voltage necessary we must find the ratio of the resistance from the emitter junction to B1 to the resistance from the emitter junction to B2.
	home.golden.net /~rajkumar/reporton/onlinrep/motor/motor_power_control.htm (1263 words)

	Active pull-up voltage spike reducer - Patent 5682115
		A circuit as recited in claim 1, wherein said voltage reducing circuit further comprises a pulse generator, said pulse generator producing said enabling signal to said level translator stage.
		The method as recited in claim 6, wherein said spike reducer enabling pulse is sufficient in time duration such that said measure of current is sufficient to maintain circuit speed.
		The method as recited in claim 9, wherein said spike reducer enabling pulse is sufficient in time duration such that said measure of current is sufficient to maintain circuit speed.
	www.freepatentsonline.com /5682115.html (1881 words)

	Spike voltage topography identifies two types of frontotemporal epileptic foci -- Ebersole and Wade 41 (9): 1425 -- ...
		Spike voltage topography identifies two types of frontotemporal epileptic foci -- Ebersole and Wade 41 (9): 1425 -- Neurology
		Spike voltage topography identifies two types of frontotemporal epileptic foci
		We characterized voltage topography of frontotemporal EEG spikes in 24
	www.neurology.org /cgi/content/abstract/41/9/1425 (201 words)

	TiVo Community Forums Archives - Car voltage spike...
		It's a 91 Dodge Stealth that has 105K miles...he says (and I trust him) that the only issue he has with it is that every so often, the voltage will spike high, cut out the radio for a second and then everything goes back to normal.
		But voltage spikes where you can immediately "see" effects on instrumentation indicate a problem.
		You may still get a large voltage spike depending on where the problem is. If there's a load dump/grounding problem deep in the harness away from the battery, the battery will do little to stop it because of the inductance/resistance of the harness.
	archive.tivocommunity.com /tivo-vb/history/topic/119403-1.html (920 words)

	Voltage spike - TheBestLinks.com - Electrical network, Electronics, Electric current, Joule, ... (Site not responding. Last check: 2007-10-25)
		Voltage spike - TheBestLinks.com - Electrical network, Electronics, Electric current, Joule,...
		Voltage spike, Electrical network, Electronics, Electric current, Joule...
		You can add this article to your own "watchlist" and receive e-mail notification about all changes in this page.
	www.thebestlinks.com /Voltage_spike.html (275 words)

	NASIOC - Driving lights voltage spike
		I see a small, momentary, drop in battery voltage (about 0.6 volts) when going from dipped to main + driving lights, and a similar voltage increase when I go back to the dipped beam, and I would like to get rid of this voltage spike.
		When switching the driving lights on and off with the fog light switch the spiking doesn't occur, at least it isn't visible.
		I have some electronic equipment connected to the car, and the spike is large enough to cause it to reset.
	forums.nasioc.com /forums/showthread/t-332228.html (282 words)

	! FAQ Why use Hi-performance surge suppressors, equipment protection, modem protectors
		Most immediate damage would be caused by high voltage Spikes and Surges and Voltage fluctuations.
		For a given Spike threat, the more Surge Amps a protective device can handle, the better the Spike will be suppressed.
		Ferroresonant regulators (the more expensive device) operate to correct voltage variations on a continuous basis and also incorporate inherent spike/surge suppression and interference filtering.
	www.elect-spec.com /faquse.htm (831 words)

	line noise suppressors,line noise filters,mains filter,spike suppressor (Site not responding. Last check: 2007-10-25)
		Line noise filters of the NS series, are a first level protection against high frequency interferences and voltage spikes for computers, electronic systems, instrumentation, hi-fi systems and scientific equipment.
		In fact, these line noise suppressors combine into one unit the performances of a broad-band LC filter and TVP (transient voltage protection), being the latter a spike suppressor, i.e a device suitable to absorb and reduce high energy voltage spikes.
		In compliance with European standards, and assembled in a sturdy metal case, the mains filters NS ensure a reliable connection for the loads to be powered.
	www.luxmaster.com /en/AVR/AVRns.htm (173 words)

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