BC Wiki - Flyback Transformers

Category: diy

WARNING: flyback transformers are capable of outputting extremely high voltages! Follow all high voltage safety protocols when handling!

Flyback Driver Topologies

4HV.org - Uzzors2K - a fantastic page with lots of detail and discussion. Includes schematics for four different drivers:

  1. 555 Driver - flyback mode, direct to MOSFET (IRFP450)
  2. 555 Driver - flyback mode, to MOSFET (IRFP450) via Class B push-pull output driver
  3. Mazzilli ZVS Driver - a self-oscillating zero-volt-switching push-pull driver
  4. Multi-Purpose Inverter - 230VAC rectifier, TL494-based oscillator, and UC3710T-based gate drivers coupled to the push-pull (aka ‘half bridge’) MOSFETs (IRFP450) by a gate-drive transformer, with overheat and overcurrent protection

Gauge Boson - High Voltage - an excellent description of Mazilli ZVS driver construction and operation, including links to a working simulation and some very nice point-to-point assembly.

Pocket Magic - High Voltage Power Supplies - an excellent roundup of just about every driver topology that exists! Includes information on running dual ignition coils in anti-parallel, a dual flyback modification of the Mazilli ZVS that I haven’t seen anyone else, a description of using voltage multipliers with AC HV sources, and links to solid-state and ZFS-based Tesla coil designs.

The 4HV.org wiki page on flyback transformers - includes a run-down of the basic driver types, and includes a schematic of Andrinerii’s modification to the Mazzilli ZVS.

RM Cybernetics - Homemade Ignition Coil Driver - a good discussion of multiple ignition coil topologies.

Scope Boy - The IGBT Brick Driver - a TL494-based driver for use with IGBTs; includes schematics for an audio-modulated version!

References

http://www.angelfire.com/80s/sixmhz/flyback.html

http://mujweb.cz/jmartis/flybacks.htm

http://mostlymacros2012.blogspot.com/2012/09/plasma-and-homemade-flyback-transformer.html

http://reibot.org/easy-high-voltage-supply/

http://rimstar.org/equip/30kv_pwr_supply.htm

http://www.sm0vpo.com/power/diy_transformers.htm

http://www.diyphysics.com/2012/02/09/d-i-y-250-kv-high-voltage-dc-power-supply-with-neat-trick-for-switching-polarity/

http://www.hvtesla.com/radartransformer.html

http://www.kronjaeger.com/hv/hv/src/fly/

http://adammunich.com/flyback-transformers/

http://madlabs.info/flyback.shtml

http://wiki.4hv.org/index.php/Flyback_transformer

http://www.angelfire.com/oh3/ebjoew/Flyback.html

Contact Performance in Relays: Contact Protection - an excellent tutorial on protecting switches from flyback while driving highly inductive loads. Very relevant to protecting MOSFETS in flyback drivers!