multiple MOSFET s in Pulse circuit
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Posts: 46,084
Hi all,
I want to charge a cap then discharge it in a very fast time frame.
I'm looking at using photo flash unit caps (pulled from those cheap
disposable camers.) 120uF 330WV
I want to use a 70 volt power supply and charge the cap to at least
two time constants and then drain it.
This would be done by using a MOSFET isolating the cap. open the
discharge circuit and close the charging, then open the charging line
and close the discharge circuit.
My problem is that I want to have a pair of these going sequencially
so when one is charging, the other is firing.
My concern is not blowing up the MOSFET as it is charging when it
sees the firing from the other unit.
In addition, I don't want to shunt to ground, what would normally be
thought of (to me anyway) as a back EMF from the firing MOSFET.
any ideas ?
Dave
I want to charge a cap then discharge it in a very fast time frame.
I'm looking at using photo flash unit caps (pulled from those cheap
disposable camers.) 120uF 330WV
I want to use a 70 volt power supply and charge the cap to at least
two time constants and then drain it.
This would be done by using a MOSFET isolating the cap. open the
discharge circuit and close the charging, then open the charging line
and close the discharge circuit.
My problem is that I want to have a pair of these going sequencially
so when one is charging, the other is firing.
My concern is not blowing up the MOSFET as it is charging when it
sees the firing from the other unit.
In addition, I don't want to shunt to ground, what would normally be
thought of (to me anyway) as a back EMF from the firing MOSFET.
any ideas ?
Dave