Flyback driver 1 Single transistor driver. March 2. 01. 2 Back in 2. I have made numerous experiments with flyback transformers and with simple single transistor drivers, most of these were undocumented. However, this was one of my very first high voltage circuits and my first electronic circuits in general, which were marked with some success. The resulting simplicity of this circuit pardons the low output efficiencySchematic. This circuit, also incorrectly known as the 2. Flyback-Switch-Mode-Power-Supply-Circuit.gif' alt='Flyback Mosfet Driver Circuit' title='Flyback Mosfet Driver Circuit' />SLUA604 August 2011 2 A High Efficiency Synchronous Rectifier Flyback for High Density ACDC Adapter Figures Figure 1. Psp Games 100 Mb. Simplified SRFlyback schematic with. Published on Jun 14, 2013. Updated on Nov 28, 2017. Introduction I wanted to design a versatile driver circuit that could drive a half or fullbr. Schematic. This circuit, also incorrectly known as the 2N3055 flyback driver, bears some resemblance to the battery invertercontinuity tester which is. N3. 05. 5 flyback driver, bears some resemblance to the battery invertercontinuity tester which is published here. It is the same topology with almost the same efficiency, and its actually a nice example what happens when a primitive circuit like this is used with slightly bigger input powers. High voltage enthusiasts surely know what I am talking about this circuit is woefully unstable, inefficient, heats up immensely and it is seriously prone to failure when overdriven over 1. The main reason is the lack of protection circuits, no stabilization, no control over the frequency, feedback and a lack of methods to improve this flyback topologys efficiency. Flyback Transformer Drivers The 555 Driver Basic Flyback transformers are found in monitors, TVs or anything with a CRT, and are sometimes known as Line OutPut. However, this circuit still serves its purpose it is a gateway of every beginning high voltage experimenter to the world of arcs, sparks and alike since it is simple to construct plus the low output power makes an accidental contact with flybacks energized output non lethal. It will slap and kick like hell and maybe some minor burns might occur, however it teaches the experimenter to have respect before moving to more efficient and powerful drivers. And the output can also light up a candle easily well, if the flame is not extinguished by the anodes ionic wind, like in the video, unfortunately. K pricing is for budgetary use only, shown in United States dollars. The prices are representative and do not reflect final pricing. Contact your local Microchip. Tired of little purple sparks Want bigger hotter sparks Then try The ZVS Flyback Driver It is probably the most powerful and efficient flyback. This single transistor flyback driver topology was created in response to achieve higher efficiency and higher output voltages from ordinary CRT television flybacks. An H bridge is an electronic circuit that enables a voltage to be applied across a load in opposite direction. These circuits are often used in robotics and other. Flyback driver in a cage. The reason why Ive put the 2. N3. 05. 5 driver in quotation marks is simple. This circuit isnt precisely the 2n. Plus, almost every new 2. N3. 05. 5 you will come across at auction sites and e shops nowadays will be counterfeit and made somewhere in the Third World, thus they are seriously underrated in maximum ratings, especially current ratings and breakdown voltage. For this reason I have used more sturdy bipolar transistors made by the former Czechoslovak TESLA, most notably the KD5xx and KD6xx series, which could take at least 2 times more abuse than the original 2. N3. 05. 5 made by the U. S. RCA company However, lets move on An improved version of the original driver. Well, after fiddling with ZVS drivers and similar halfbridge circuits I have returned back to the original 2. N3. 05. 5 driver approach. Then Jan Marti, a Czech experimenter, came up with an idea to increase the efficiency of these flyback topologies to add a resonant capacitor to the primary winding and tuning it afterwards to get the best output. This circuit will remind you of the international 2. N3. 05. 5 driver you are familiar with. The principle is still the same, it is self oscillating and has a feedback winding intact, but notice the resonant capacitor in the primary which really makes wonders. That fast diode is there to protect the bipolar transistor from excess voltage spikes. And thats all, folksBy tuning the resonant capacitor and the input voltage, youre likely to get thinner arcs and bigger output voltage, or fat arcs and a smaller voltage output, or a compromise, or it will fail to oscillate. The last one happens when the primaryfeedbacksecondary windings are in incorrect polarity or phasing, or if the input voltage is too low 1. Likewise, the NPN must be heatsinked like in the first unmodified driver This is what Ive got with a 3. I used a 4. 0 watt transformer which couldnt supply enough current to make fat arcs in laymans terms, but because of that voltage drop it was still safe for the transistor to operate.