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Topic: Flyback transformer

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	Flyback Transformers - kickback transformer
		The flyback transformer utilizes the "flyback" action (also known as "kickback") of an inductor or flyback transformer to convert the input voltage and current to the desired output voltage and current.
		A flyback transformer first stores energy received from the input power supply (charging portion of a cycle) and then transfers energy (discharge portion of a cycle) to the output, usually a storage capacitor with a load connected across its terminals.
		The diode is oriented to block current flow from the flyback transformer (or source) to the capacitor and the load resistor during the charging stage.
	www.butlerwinding.com /elelectronic-transformer/flyback (1699 words)

	Flyback transformer - Wikipedia, the free encyclopedia
		A flyback transformer (FBT) or line output transformer (LOPT) is a type of transformer used to generate the high voltage needed for driving a cathode ray tube (CRT) or "picture tube".
		The main advantages of the flyback transformer over a standard mains transformer are its small size and light weight, which are the results of operating it at the line frequency (many kilohertz) instead of the mains frequency (50 or 60 Hz).
		The problem is exacerbated by the tendency of the flyback to accumulate a coating of dust due to electrostatic attraction, which serves as a path to ground for leaks which might otherwise not be of sufficient magnitude to initiate the chain of events leading to destructive failure, as described.
	en.wikipedia.org /wiki/Flyback_transformer (775 words)

	Flyback Transformer Spotlight - an archive of flyback transformer articles and flyback transformer links
		Flyback transformers - used in power supplies to generate high voltages needed for driving a CRT - is a popularly researched topic within the power electronics industry.
		--> Using functional principles of continuous mode of a flyback transformer as a basis, here is a study of the function of an air gap in a ferrite core....
		--> Flyback transformers are members of the "power inductor" family, functioning by taking energy from the electrical circuit, storing it in a magnetic field, and subsequently returning this energy (minus losses) to the circuit....
	powerelectronics.com /power_systems/flyback-transformer (350 words)

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	www.beyondbait.com /menu/transformer.htm (580 words)

	Flyback Transformer Spotlight - an archive of flyback transformer articles and flyback transformer links
		Flyback transformers - used in power supplies to generate high voltages needed for driving a CRT - is a popularly researched topic within the power electronics industry.
		--> Using functional principles of continuous mode of a flyback transformer as a basis, here is a study of the function of an air gap in a ferrite core....
		--> Flyback transformers are members of the "power inductor" family, functioning by taking energy from the electrical circuit, storing it in a magnetic field, and subsequently returning this energy (minus losses) to the circuit....
	www.powerelectronics.com /power_systems/flyback-transformer (315 words)

	Sam Goldwasser's Flyback Transformer Circuit
		On flybacks with no HV rectifier or multiplier, the return is easily located by measuring resistance between the HV output and all other terminals.
		Note: this kind of flyback transformer drives the CRT directly and uses its glass envelope as the main high voltage filter capacitor.
		The ferrite core of a flyback transformer is constructed with a precision gap usually formed by some plastic spacers or pieces of tape.
	members.misty.com /don/samflyhv.html (1490 words)

	Sci.Electronics.Repair FAQ: Testing of Flyback (LOPT) Transformers
		The main difference between a flyback transformer and a regular transformer is that a flyback transformer is designed to store energy in its magnetic circuit, i.e., it functions like a pure inductor, whereas a regular transformer is designed to transfer energy from its primary to secondary and to minimize stored energy.
		The term 'flyback' probably originated because the high voltage pulse that charges the CRT capacitance is generated by the collapse of the magnetic field in the core of the transformer during the short retrace period - when the electron beam in the CRT 'flies back' to the start of a new scan line.
		While flyback transformers can on occasion be blown due to a failure elsewhere in the TV or monitor's power supply or deflection circuits, in most cases, they simply expire on their own.
	www.repairfaq.org /REPAIR/F_flytest.html (6662 words)

	[No title] (Site not responding. Last check: )
		The main difference between a flyback transformer and a regular transformer is that a flyback transformer is designed to store energy in its magnetic circuit, i.e., it functions like a pure inductor, whereas a regular transformer is designed to transfer energy from its primary to secondary and to minimize stored energy.
		The origin of the term, 'flyback': --------------------------------- In the U.S. (possibly all of North America), the transformer that generates the high voltage in a TV, monitor, or other CRT based equipment, is called the 'flyback' or 'flyback transformer'.
		The term 'flyback' probably originated because the high voltage pulse that charges the CRT capacitance is generated by the collapse of the magnetic field in the core of the transformer during the short retrace period - when the electron beam in the CRT 'flies back' to the start of a new scan line.
	www.eio.com /repairfaq/sam/flytest.htm (6219 words)

	POWERLABS' High Voltage Solid State Flyback Driver
		So, overall, flybacks with built in rectifiers are still usable, but you should look for one that has either a removable rectifier (sometimes the rectifier is inside a tube that sticks out from the flyback, other times it is encapsulated in epoxy next to it.
		Black and white TV flybacks tend to have a higher internal capacitance and higher step-up ratio, whilst monitor flybacks are pretty much useless, as far as the modern ones are concerned.
		Flybacks are built tough, but they are high voltage parts, and as such they tend to have a limited useful life.
	www.powerlabs.org /flybackdriver.htm (3733 words)

	Flyback Converter Serves Battery-Powered CCD Applications - マキシム/ダラス
		Flyback spikes due to non-ideal transformer action are controlled with a snubber network.
		Because the heart of a flyback power supply is its transformer, the transformer specifications should be determined early in the design.
		High-voltage spikes originate in the flyback transformer, whose primary circuit is represented by a simplified model.
	japan.maxim-ic.com /appnotes.cfm?an_pk=665 (1140 words)

	Jochen's High Voltage Page : Flybacks
		Flybacks for use with a cascade (voltage multiplier).
		The flyback output is usually around 8-10kV (peak to peak), which is often tripled by the cascade to 24-30kV DC.
		Flybacks which are connected to the CRT via only a single rectifier.
	www.kronjaeger.com /hv/hv/src/fly/index.html (1660 words)

	CAL0010e
		In the flyback transformer’s continuous mode, the output voltage is "impressed" for practical purposes, and is not greatly dependent upon load.
		Secondly, the flyback transformer is larger with less ripple in the primary current.
		However, there are two modes which relate exclusively to the flyback transformer: primary winding inductance and the gap for calibration of the primary winding inductance.
	www.bwdarrah.com /ralesamples/CAL0010e/CAL0010E.htm (1818 words)

	Transistor Driven High Voltage Flyback Transformer Page.
		Flyback transformers can be found in any equipment with a Cathode Ray Tube (CRT) like televisions or computer monitors.
		Flybacks can be very picky as to coil polarity because some of them have a rectifier built in them.
		The flyback was old enough that the rectifier "stick" stuck out of the side of the secondary windings and I was able to remove it with a hack-saw.
	www.angelfire.com /80s/sixmhz/flyback.html (2018 words)

	Flyback Transformer Design for MAX1856 SLIC Power Supplies - マキシム/ダラス
		Familiarity with flyback transformer design is necessary in order to choose the correct transformer for a given application.
		However, increasing the transformer leakage inductance is not a viable option since that will lead to large voltage spikes across the rectifier diode and across the MOSFET during turn-off.
		A larger transformer must operate at a lower power density because the surface area dissipating heat does not increase in proportion to the volume producing the heat.
	japan.maxim-ic.com /appnotes.cfm?an_pk=1166 (4488 words)

	Testing of Flyback (LOPT) Transformers
		The voltages applied to a flyback transformer on the primary side are almost always rectangular (pulsed) whereas regular transformers usually have sinusoidal voltages applied to them.
		In the U.S. (possibly all of North America), the transformer that generates the high voltage in a TV, monitor, or other CRT based equipment, is called the 'flyback' or 'flyback transformer'.
		While flyback transformers can on occasion be blown due to a failure elsewhere in the TV or monitor's power supply or deflection circuits, in most cases, they simply expire on their own.
	repairfaq.ece.drexel.edu /sam/flytest.htm (8787 words)

	FLYBACK TRANSFORMERS
		FLYBACK TRANSFORMER 154-106C, with warranty 6 months, (FLYBACK TRANSFORMER 154106C)
		FLYBACK TRANSFORMER 154-125C, with warranty 6 months, (FLYBACK TRANSFORMER 154125C)
		FLYBACK TRANSFORMER 154-162C, with warranty 6 months, (FLYBACK TRANSFORMER 154162C)
	www.flyback-transformers.cdlens.com (684 words)

	Power Transformer,Current Transformer,Inductor,Electric & Electrical Transformer,Voltage Transformer,Step Up ...
		By purchasing transformers from Competitive Magnetics you receive the benefits of the low cost of transformers from Asia along with purchasing from a source in the USA with the highest standards in customer service and product quality.
		This is why our transformers are tested 100 percent to achieve a next to zero defect ratio and delivered to you within 6 weeks.
		Competitive Magnetics also recognizes the difficulties in locating a reliable offshore source that consistently delivers quality transformers and inductors, the difficulty in communicating with the source, and the customs and shipping paperwork that comes with importing materials from offshore sources.
	www.custompowertransformer.com (237 words)

	Flyback Transformers - kickback transformer
		By definition a transformer directly couples energy from one winding to another winding.
		For these reasons almost all flyback transformers (or inductors) are gapped.
		For more information on our capabilities, click on our "capabilities" link.
	www.butlerwinding.com /elelectronic-transformer/flyback/index.html (1699 words)

	Flyback Transformer
		These can be the symptoms of a dead or dying Flyback Transformer.
		The Flyback Transformer can be fixed but it's a $200 to $300 repair and probably more than the computer is worth.
		This is a low cost solution to a dead Flyback Transformer.
	www.djonmac.com /links/flybacktransfor.html (511 words)

	EDN Access--03.14.97 Spreadsheet simplifies switch-mode power-supply flyback-transformer design
		The secondary winding carries a reflected voltage that is related to the primary voltage by the transformer turns ratio and has the same "dot" polarity.
		Margin width M, determined by insulation methods and regulatory requirements, is usually set at 2.5 to 3.0 mm for margin-wound transformers or to zero for transformers wound with insulated wire.
		The flyback transformer stores energy proportional to the square of the primary current.
	www.edn.com /archives/1997/031497/06DF_04.htm (1942 words)

	Power Management DesignLine \|Underutilized SEPIC outperforms the flyback topology
		Voltage spikes on the power switch and output diode caused by the flyback transformer leakage inductance usually require a voltage clamp and/or snubber circuit to limit the peak voltage, further reducing efficiency.
		The flyback uses three input capacitors rated to handle the large ac-RMS requirement of the pulsating current generated by the FET switch.
		The flyback transformer leakage inductance produces a voltage spike that adds an additional 20V to the "flat-top" voltage.
	www.powermanagementdesignline.com /howto/165700004 (1928 words)

	aterry flyback (Site not responding. Last check: )
		A flyback transformer is the transformer that generates the highest voltage in a Cathode Ray Tube (CRT) based equipment in the United States and most of North America.
		The second thing a flyback Transformer does is, provide focus and screen supplies, if this fails poor focus or brightness may result.
		A flyback transformer is designed to store energy in its magnetic circuit, which is the main characteristic that differentiates it from a regular transformer.
	www.mbhs.edu /~jkaluta/fall2000/624825aterryflyback.htm (376 words)

	Notes on the Troubleshooting and Repair of Television Sets
		The flyback generates most of the other voltages used in the unit and provides an isolation barrier so that the signal circuits are not line connected and safer.
		If you are not using an isolation transformer (a no-no), connecting your scope to the wrong ground point can result in (1) blown fuses and/or blown parts, and a very dangerous situation and (2) readings that don't make sense generally with distorted power line frequency signals of high amplitude.
		Where there are two adjustment knobs on the flyback transformer, the top one is generally for focus and the bottom one is for G2.
	repairfaq.ece.drexel.edu /sam/tvfaq.htm (20293 words)

	Super flyback driver schematics
		It is best to mount the driver and mains transformer inside an old PC power supply metal encasing, and use connectors to plug in a TV flyback externally.
		At maximum settings the output of the flyback will be very high power, and is definitely not something to touch as such nor as in a plasma/lightbulb globe.
		Note: normally TV flybacks are driven from 97VDC and thus the current drawn decreases by 2/3, but, high voltage spikes increase proportionally, so if you have a 90V transformer you would have to replace the MOSFETs used here with high voltage switching transistors plus a base resistor.
	users.tkk.fi /~jwagner/tesla/tv-driver/schematics.htm (1415 words)

	Embedded.com - Flyback transformer tutorial: function and design (Site not responding. Last check: )
		Other advantages of the flyback transformer over circuits with similar topology include isolation between primary and secondary and the ability to provide multiple outputs and a choice of positive or negative voltage for the output.
		As shown in Figure 1, the polarity dots on the transformer and the diode are arranged such that there is no energy transferred to the load when the switch is on.
		When the switch is turned off, the polarity of the transformer winding reverses due to the collapsing magnetic field, the output rectifier conducts and the energy stored in the core material is transferred to the load.
	www.embedded.com /showArticle.jhtml?articleID=187002936 (528 words)

	bauerb2@comcast
		In most new flybacks, they have a built in HV rectifier diode.
		People say the older ones work better than the newer ones because the newer ones are more complicated and are not made well for HV purposes like tesla coils or anything else like that.
		You cant just solder 2 wires randomly onto the flyback and plug it into the wall...that's not how it works.
	home.comcast.net /~bauerb3/fbx.htm (346 words)

	Testing of Flyback (LOPT) Transformers
		A flyback transformer in its simplest form has current flowing either in its primary, or in its secondary (but not both at the same time).
		The voltages applied to a flyback transformer on the primary side are almost always rectangular (pulsed) whereas regular transformers usually have sinusoidal voltages applied to them.
		The currents flowing through either side of a flyback transformer are either increasing or decreasing linear sawtooths, whereas a regular transformer usually has sinusoidal currents.
	www.repairfaq.org /sam/flytest.htm (8807 words)

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