Flyback Driver | Electronic Project Circuits

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Flyback Transformer Based high voltage generators

Uses a 555 timer IC to generate a 720Hz triangle waveform (at pin 2 of the IC). This waveform is of about 50% duty cycle. This triangle waveform is compared to a fixed voltage with a comparator, IC2. The fixed voltage can be varied by potentiometer VR1. The output of the comparator is a 720Hz square wave of variable duty cycle. The potentiometer must be adjusted so that Q2 is near to 0% duty cycle (ie it spends the majority of the time off).

Read More Source:http://www.hills2.u-net.com/electron/eht3.htm
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Be the first to comment - What do you think? Posted by admin - January 31, 2008 at 8:59 pm

Categories: High voltage Tags: 555 dc converter, flyback driver, High voltage

Efficient flyback driver by IC 555 + IRF510

This is a good and fairly efficient flyback driver circuit. All parts can be obtained easily from Radio Shack, including the MOSFET. This circuit uses a 555 timer IC to pulse a 2N2222 with square wave at a frequency that is set by the capacitor and the potentiometers. The 2N2222 then drives the gate of the MOSFET and the MOSFET delivers the pulse to the ten turn winding on the flyback. If you build this circuit you will have to adjust the potentiometers until you get the longest arc possible. The circuit will run from +12VDC to +15VDC at about 3A. The MOSFET must be heatsinked! This is important if you are going to run this for any decent amount of time. If the MOSFET still gets too hot or burns up you can place a 4 ohm (for a +12V supply) or a 5 ohm (for a +15V supply) between the source lead of the MOSFET and the primary on the flyback. Make sure that these resistors havethe proper power rating for the voltage and current that they will be carrying. The flyback should be wound with ten turns of 14-16 guage solid wire. Anchor it in with some electrical tape. Any previous primary windind should have already been removed before winding the new one.
source:http://www.geocities.com/CapeCanaveral/Lab/5322/fbt2.htm

Be the first to comment - What do you think? Posted by admin - October 31, 2007 at 10:40 pm

Categories: High voltage, Power supply, Switching power supply Tags: 555, flyback driver, irf510, power supply high Voltage

10-30kV TV flyback driver with 2N3055

This is probably the most well known flyback transformer driver circuit. It uses two 2N3055 power transistors in a push-pull oscillator configuration. The value of the resistors is not that critical. In fact you can even use a 1/2W for the 27 ohm resistor, but it may burn out if it is left to run for a long time. This circuit will accept voltages up to about 24V, but I would not go any above this as you risk destroying the flyback transformer. Try to find an old flyback. It should have a rather disk shaped high voltage winding, rather than a cylindrical one. Also it should not have a rectifer built in. The rectifer decreases the performance of this circuit greatly since it cuts off the other cycle. You should not run this on any power supply which is expensive. This is because the circuit will produce lots of feedback and can destroy sensitive components in a decent linear or switching power supply. If you do run it on a good power supply be sure to put a large filter capacitor across the input of this circuit. A choke is also recommended. You may also get a shock off of components on the primary side, this just shows how much cemf is generated.

Read More Source: http://www.geocities.com/CapeCanaveral/Lab/5322/fbt1.htm
Thank you.