so the input to the mosfet source is already full wave DC so if he also adds a bridge capacitor there it should workv(t): Rectified voltage of a transformer by a bridge rectifier
He is not connecting the transformer tap directly, he said
so the input to the mosfet source is already full wave DC so if he also adds a bridge capacitor there it should work
Alex
A more practical approach for this application using standard relays, the tap point = rectifier bridge input to be disconnected by relays and connected to the new terminal.
Yes, the information is also shown in the first post by writing abs(sin()), which has been apparently overlooked.He is not connecting the transformer tap directly, he said
"v(t): Rectified voltage of a transformer by a bridge rectifier"
A filter capacitor before the MOSFET switch(es) would charge the capacitors of the inactive channels by the MOSFET reverse diode. The original circuit has however a weakness by the 20 V series Z-diode, because the switch will only conduct at higher input voltages. An the gate voltage will still exceed the maximum rating with 50 Vpeak input. You should better use a voltage limiting diode across the gate and preferably a constant current driver stage.so the input to the mosfet source is already full wave DC so if he also adds a bridge capacitor there it should work
Seems to be a promising approach, using NMOS for + and PMOS for - branches, needing only two isolated multi-channel gate drive circuits.A solid state device on DC line need to control 2 lines simultaneous in pairs.
A filter capacitor before the MOSFET switch(es) would charge the capacitors of the inactive channels by the MOSFET reverse diode
Actually there are diodes in the original design, but I simplified the circuit while drawing this picture.What you describe can only happen if a mosfet connected to a higher voltage turns on but I have mentioned in my first answer (#2) that he should also use diodes connected to the drains in the reverse polarity of the substrate diode to prevent that.
Alex
1. Why it should? 2. No problem.what happens if the zener fails shorted?
As far as I understand, switching 50 Hz AC voltage won't need speed up.Another person suggested adding R1/C1 as a "speed up"
1. Why it should? 2. No problem.
First, there has been a misunderstanding. I understood the comment about z-diode failure related to second circuit. For the first circuit, short of the Z-diode would be in fact bad, but you can also damage the MOSFET with the z-diode still intact.Failing shorted is a common way zener diodes fail.
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