
	Where results make sense

Topic: Crowbar (circuit)

	Pulse width modulation and protection circuit - US Patent 5748428
		The hold circuit capacitor 40 holds the output from the comparator 36 at the inverting input to the op amp 78 in the cyclical shutdown circuit 44, thereby causing the op amp 78 to turn off the transistor pass element 22.
		The hold circuit 40 holds the output from the comparator 36 at the inverting input of an op amp 78 in the cyclical shutdown circuit 44, even after the transistor pass element 22 is switched off and the comparator 36 discontinues the fault signal.
		The pulse width modulation circuit 20 of the present invention protects the transistor pass element 22 from an overcurrent situation caused by a cold positive temperature coefficient load 23 or a short circuit of any cause and allows the transistor pass element 22 to be chosen for optimal steady state operation.
	www.patentstorm.us /patents/5748428-description.html (2681 words)

	crowbar - Search Results - MSN Encarta
		A crowbar and the claw of a hammer used to pry loose nails are both common examples of levers in action.
		A crowbar, also called a pry bar or prybar, or more informally known as a jimmy, jimmy bar [ citation needed ] or jemmy (British Isles), is a tool consisting of a metal bar...
		Crowbar may refer to: Crowbar (tool) Crowbar (circuit), an electrical circuit; Crowbar (US band), a doom/sludge metal band from Louisiana; Crowbar an album by the U.S. band...
	encarta.msn.com /encnet/refpages/search.aspx?q=crowbar (162 words)

	Resonant circuit which provides dual frequency excitation for rapid cycling of an electromagnet - Patent 4472755
		During radio frequency acceleration of the particles in the synchrotron, the control circuit operates with a lower frequency cosine wave and thereafter the electromagnets are reset with a higher frequency half cosine wave.
		The crowbar circuit is switched for connection with the parallel combination during the onset of the acceleration/confinement period, just prior to connection of the second capacitor.
		Circuit 12 comprises a resonating tank circuit, wherein the resonating frequency is double valued, depending upon the position of switch 20.
	www.freepatentsonline.com /4472755.html (6667 words)

	Short circuit - myElectrical Wiki - Electrical Engineering
		A short circuit is an accidental low-resistance connection between two nodes of an electrical circuit that are meant to be at different voltages.
		Although usually the result of a fault, there are cases where short circuits are caused intentionally, for example, for the purpose of voltage-sensing crowbar circuit protectors.
		In mains circuits, short circuits are most likely to occur between two phases, between a phase and neutral or between a phase and earth (ground).
	wiki.myelectrical.com /index.php?title=Short_circuit (835 words)

	High-voltage crowbar circuit with cascade-triggered series ignitrons - Patent 4232351
		The circuit 10 (for a string of five ignitrons) was operated to switch 75A at 120 KV from the bus 14 to ground in 2 microseconds even where the voltage was dropped to zero.
		Triggering of the circuit 10 was initiated with a negative 3 KV trigger pulse 26 to ignite the tube 20 and complete overall breakdown of the entire string of tubes 18-20 in 2 microseconds at approximately 0.4 microseconds delay per tube with 50A of trigger current.
		It should be noted that the circuit 10 can also be connected for "normal" grounded cathode operation simply by moving the ground point to the cathode of tube 20, applying a positive 3 KV pulse to the former ground point with respect to the cathode and eliminating networks 24 and the diodes 48 and 50.
	www.freepatentsonline.com /4232351.html (2552 words)

	Brick Wall Audio Surge Protectors and Power Line Filters
		The clamp circuit places a 180f capacitor (C3) in parallel with C2, reducing the surge slew rate to about 8 volts per microsecond.
		The series connected crowbar circuits consist of a SCR switch, inductor and a 180f capacitor, chosen to minimize the disturbance on the power wave.
		The first crowbar circuit responds to the slew rate of the incoming surge.
	www.pricewheeler.com /howwork.htm (447 words)

	CANOE -- JAM! Music - Pop Encyclopedia - Crowbar
		Crowbar's roots can be traced back almost as far back as Roly Greenway's career.
		Crowbar was the first act to launch a record in the legislation era (a law designating the implementation of 30% mandatory Canadian content by all radio stations) with the single "Oh, What A Feeling".
		As part of Pierre Trudeau's bid to gain the youth vote, his wife Margaret Trudeau who was a Crowbar fan, asked the band to become the opening act of Trudeau's re-election campaign in 1972.
	jam.canoe.ca /Music/Pop_Encyclopedia/C/Crowbar.html (819 words)

	Power Supplies, AC DC Power Supplies, Medical Power Supplies, Commercial Power Supply Manufacturer for OEMs
		This type of protection is referred to as a "crowbar." A crowbar is a circuit that is designed into a power supply to provide a means of over-voltage protection to equipment that might be connected to the power supply.
		The crowbar circuit usually consists of a Silicone Controller Rectifier (SCR) and a zener diode as well as other components and is designed into in the power supply’s circuitry between the voltage output terminals and ground.
		The crowbar will be automatically triggered in the case of a power supply malfunction that causes the output voltage to exceed the rated value to where there may be a risk of damage to equipment that is connected to the power supply.
	www.elpac.com /resources/glossary/index.html (8183 words)

	Bi Ra Systems: Model 6700 MANUAL
		These circuits operate in the same manner as the positive regulator board circuits except that they are inverted (that is, pnp transistors for npn's) and the basic regulator is slightly different in the way it generates its reference voltage.
		The operation of the crowbar circuit on the negative regulator board is identical to that of the positive board.
		There is no crowbar circuit for the 12 volt output and it is possible for the output to go to -24 volts if the driver or regulator circuit is faulty.
	www.bira.com /products/cat/6700ml.shtml (4959 words)

	12 Volt Toilet Tank Refiller
		This circuit provides on-off pump switching for a small 12 Volt pump that is used to fill a toilet tank from an external rain water collection cistern.
		The 10 amp silicon diode is used in a crowbar circuit.
		The rest of the circuit was built on another circuit board, that was mounted on the back side of a standard electrical box with wires running to the sensor, the pump motor, and the 12V supply.
	www.technick.net /public/code/cp_dpage.php?aiocp_dp=cir_solorb_tankfill (834 words)

	Martek Power Abbott - Power Supply Glossary
		a power supply switching circuit that transfers energy to the transformer secondary when the switching transistor is on.
		a circuit that limits the inrush current when a power supply is turned on.
		a high-efficiency switching circuit that operates in a closed loop system to regulate the voltage across a load, generally by means of a pulse-width modulator.
	www.abbottelectronics.com /engineer/glossary.htm (1284 words)

	About Astec Power
		Crowbar - An overvoltage protection circuit which rapidly places a low resistance shunt across the power supply output terminals if a predetermined voltage is exceeded.
		Crowbar typically used for linear power supplies for they fail with a high output voltage.
		The filter usually consists of two parallel capacitors and a series inductance and is generally built into the supply.
	www.astecpower.com /reference/glossary.html (1607 words)

	Radio-Electronics.Com :: SCR Overvoltage Crowbar
		These overvoltage protection circuits are easy to design, simple to construct and may prevent significant levels of damage in the unlikely event of a power supply failure.
		The SCR over voltage crowbar or protection circuit is connected between the output of the power supply and ground.
		In some circuits a fuse is introduced prior to the series regulator transistor, and the SCR anode connected to the junction node where the output of the fuse is connected to the input of the series regulator.
	www.radio-electronics.com /info/circuits/scr_overvoltage_crowbar/scr_over_voltage_crowbar.php (934 words)

	Silicon Chip Online - Circuit Notebook
		The circuit consists of a series of resistors, selected so that they give readings that coincide with the 1-9 numerals on the 10V scale on a multimeter switched to the Ohms x 100 range.
		This circuit is a true clipping indicator as opposed to the level indicators that are commonly used in preamplifier stages.
		The circuit is quite simple and is based on two BD140 PNP transistors and zener diode ZD1.
	www.siliconchip.com.au /cms/A_30810/article.html (1270 words)

	Radio-Electronics.Com :: Electronic Circuits and Design Information
		The exact configuration of an electronic circuit is not always easy to remember, and even then there are associated electronic circuit design formulae to calculate the various circuit values.
		RC or resistor capacitor circuits are used in a number of applications and may be used to provide simple frequency dependent circuits.
		Logic circuits consisting of building blocks including AND and OR and NAND and NOR gates for the basis of today's digital circuitry that is used in widely in electronics.
	www.radio-electronics.com /info/circuits/index.php (539 words)

	Words for Power Supply Engineering
		Crowbar protection can also refer to a circuit which has its sole purpose to cause a fuse to blow by subjecting it to high current.
		A forward converter is a switching power supply circuit that transfers the energy from the primary to the secondary while the switching element is "on," which is the opposite of a flyback converter.
		This is critical in cases where a human can be part of the circuit, such as in an operating room, so leakage current is limited to a low value in medical grade power supplies.
	www.powerstream.com /SwPSFAQ.htm (2119 words)

	The Silicon-Controlled Rectifier (SCR) : THYRISTORS
		Another practical use for the SCR in a DC circuit is as a crowbar device for overvoltage protection.
		A "crowbar" circuit consists of an SCR placed in parallel with the output of a DC power supply, for the purpose of placing a direct short-circuit on the output of that supply to prevent excessive voltage from reaching the load.
		Some device or circuit sensing the output voltage will be connected to the gate of the SCR, so that when an overvoltage condition occurs, voltage will be applied between the gate and cathode, triggering the SCR and forcing the fuse to blow.
	www.allaboutcircuits.com /vol_3/chpt_7/5.html (2850 words)

	Parellel port output
		Then you connect the circuit to the parallel port so that one end of the circuit goes to one data pin (that one you with to use for controlling that LED) and another one goes to any of the ground pins.
		The mode of failure for the sink transistor might be short circuit, and consequently you would have the solenoid tap shorted to ground indefinitely.
		The problem of the circuit is that the voltage which goes to the relay is always limited to less than 4.5V even if you use higher Vcc supply.
	www.smendes.com /el31p/parallel.htm (2784 words)

	SPC3 9 Amp / 10 Amp Solar Power Center
		A kit with the circuit board and parts for this circuit is available from CirKits.
		Diode D1 is wired as a crowbar circuit, if the battery is connected in reverse, the fuse to blow, saving the rest of the circuitry from destruction.
		Leave the circuit connected until the battery voltage has reached or exceeded the desired full-charged setting, this is typically around 13.8V at room temperature.
	www.solorb.com /elect/solarcirc/spc3 (1349 words)

	Artesyn Technologies - Glossary: Common-node noise - Current Limiting
		An overvoltage protection circuit which rapidly places a low resistance shunt across the power supply output terminals if a predetermined voltage is exceeded.
		Circuit de protection contre les surtensions qui place rapidement un shunt de faible résistance sur les bornes de sortie de l’alimentation en cas de dépassement d’une tension prédéterminée.
		Ce circuit est généralement utilisé pour les alimentations linéaires qui tombent en panne en cas d’une tension de sortie élevée.
	www.artesyn.com /powergroup/c.htm (833 words)

	RE: [Elecraft] Anyone know this info about switching supplies?
		This is why most high end analog power supplies have some kind of crowbar circuit on the output that shorts the output if it exceeds some set voltage.
		It is always possible that the regulator could fail or even the feedback circuit that sets the output voltage could fail and cause an overvoltage condition although this is very rare.
		A crowbar circuit would be easy to add to any power supply.
	www.mail-archive.com /elecraft@mailman.qth.net/msg42663.html (490 words)

	Crowbar C Bands and Artists Music Arts
		The Back Page: Reed talks of yogurt, Independence Day and iceAndover Townsman, MA - Apr 5, 2007We had an ice chisel, which resembles a crowbar or a pry bar, to break off the blocks of ice to be able to move the blocks to the shore.
		Skeletal remains of 8 people found in the woods in southwest FloridaNorth County Times, CA - Mar 24, 2007"He brought a crowbar and hammer and he sawed off a section of wood and pulled up the molding and everything," Exner said.
		Total Power Optimization in RTL-to-GDSII Implementation FlowEETimes.com - Mar 12, 2007This causes a momentary short circuit between the V DD (logic 1, power) and V SS (logic 0, ground) rails, and the ensuing crowbar current results in a...
	www.iaswww.com /ODP/Arts/Music/Bands_and_Artists/C/Crowbar (239 words)

	About Astec Power
		Crowbar - An overvoltage protection circuit which rapidly places a low resistance shunt across the power supply output terminals if a predetermined voltage is exceeded.
		Crowbar typically used for linear power supplies for they fail with a high output voltage.
		Impedance - The ratio of voltage to current in AC circuits, containing both resistance and reactance terms, usually expressed as ohms.
	www.astec.com /reference/glossary.html (1607 words)

	TTL Power Supply with ‘Crowbar’ protection (Site not responding. Last check: )
		The duration of over-voltage that can destroy TTL chips is much too brief to trigger any conventional fuse, so that only other semiconductor circuits can play any useful part in protecting a circuit against the type of failure of a stabilizer that leads to excessive voltage.
		Many modern digital circuits make extensive use of MOS devices, which are less susceptible to damage from over-voltage, but it is unusual to find a large digital circuit, which does not contain at least one or more TTL devices.
		In the circuit, the capacitors that are shown connected each side of the IC are very important for suppressing oscillations and must not be omitted.
	www.electronics-lab.com /projects/power/034/index.html (542 words)

	London Home Wind Power Pilot Project - Earth Notes
		So the circuit that I have built is nominally a voltage quadrupler (x4), but given losses such as from the diode forward drops, it is actually nearer x3.
		I tried to build the multiplier circuit small enough to go in the turbine body but failed; so there is a 4m hop from the turbine to my shed and the multiplier, and then another several metres up to the battery end currently in my office.
		The 10 Ohm resistor is to limit ripple current for the capacitors and their associated diodes which may be rated lower than the bridge's diodes; its value should be adjusted depending on the generator DC impedance and the capacitor values and maximum ripple current, and it might not even be needed.
	www.earth.org.uk /wind-power-pilot-autumn-2007.html (3663 words)

	GMDSS (DM) FCC Element 9 Question Pool
		In the comparator circuit shown on Diagram EL9C2D, the nominal output voltage when the output is high is 4.5 volts.
		In the op amp circuit on Diagram EL9C2E, the input voltage is -100mV DC.
		In the circuit on Diagram EL9C2J, the purpose of the diode is to:
	members.aol.com /ab0di/el9c2.html (1655 words)

Try your search on: Qwika (all wikis)