Flyback driver 1

233

02:29:49

Switching transistor runs in CE configuration and is driven from current souce so this is very crude and simple method.
This is good enough for driving lower frequency devices such as "CRT's electrode power supply" flybacks from old TV set at power levels around 20-30% of their rated output.

Pot controls level of power that is feed into flyback in every load cycle 

published 6 years ago

hurz

6 years ago

Im speechless, thanks sec for such a nice circuit! TVs today do have a max voltage of 90V what i have seen last time. All this LCD TVs need this for there LEDs backlight in series. OLEDs do they have extra LED for some backlight environment? IDK

hurz

6 years ago

Sec can you simplify why it does oscillate?

Secuture

6 years ago

it uses rapid voltage rise when inductor current reach value that match main transistor conductance whose itself is set by it's base driver. This voltage is used to decrease main transistor conductance that even more increase voltage drop and... etc,etc... (in short yet another blocking oscillator :) Direct base drive equals poor converter. dependence on varying beta and na sty miller cap that limits operating frequency seriously decrease performance. Good solution for that is to use base driver transformer. (...HOT transistor driving circuits in old CRT's are good example)

faceblast

6 years ago

yay it's secuture back again

faceblast

6 years ago

otdavna ne sme se viždali

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