moshik3
Member level 2
Hi,
I have a circuit which is charging a big capacitor from 12v battery (flyback)-
the output capacitor is charged to 200-800v.
it is user selectable. sometimes it works at 220v, sometimes higher. selectable using a pot.
along with that i have a small trigger coil (with its own small capacitor) which requires the same voltage at all times to work.
it requires about 300v min to work reliably.
the basic idea would be to feed the trigger circuit from the main capacitor, and it works.
even over-powering it with 800v is acceptable.
the problems comes in when the output capacitor is at 200v, the trigger coil just doesn't get enough voltage to work reliably....
is there any really simple (and low parts count!!!) to raise that 200v to 300v just for the trigger capacitor ? (0.47uF max)
i am really desperate, and even thought of adding a stand-alone independent boost converter to make 300v out of the 12v battery -
but is is really a bad idea - more PCB space, another coil, mosfet, PWM IC, sense resistor, and some other small components which will double the parts count for me... it's really bad.
any idea, my bright friends ? :grin:
I have a circuit which is charging a big capacitor from 12v battery (flyback)-
the output capacitor is charged to 200-800v.
it is user selectable. sometimes it works at 220v, sometimes higher. selectable using a pot.
along with that i have a small trigger coil (with its own small capacitor) which requires the same voltage at all times to work.
it requires about 300v min to work reliably.
the basic idea would be to feed the trigger circuit from the main capacitor, and it works.
even over-powering it with 800v is acceptable.
the problems comes in when the output capacitor is at 200v, the trigger coil just doesn't get enough voltage to work reliably....
is there any really simple (and low parts count!!!) to raise that 200v to 300v just for the trigger capacitor ? (0.47uF max)
i am really desperate, and even thought of adding a stand-alone independent boost converter to make 300v out of the 12v battery -
but is is really a bad idea - more PCB space, another coil, mosfet, PWM IC, sense resistor, and some other small components which will double the parts count for me... it's really bad.
any idea, my bright friends ? :grin: