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Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
D1 will cause generalized destruction in this position when the lower mosfet interrupts the current in the coil. Remove it. And, as already said, you can't drive with low voltage the upper mosfet.
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
Antonio, which circuit are you referring to? In mine, D1 connects to Vcc = 15V, which is separated from the main supply so everything is fine and V_GS of the upper mosfet is within 0..14.5V
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
hboy007 wrote ...
Antonio, which circuit are you referring to? In mine, D1 connects to Vcc = 15V, which is separated from the main supply so everything is fine and V_GS of the upper mosfet is within 0..14.5V
Your circuit is ok. D1 in the circuit posted by NovoRei would cause the "kickback" voltage generated by the coil when the lower mosfet ceases to conduct to be applied to the gate of the upper mosfet trough the zeners, almost surely destroying it.
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
Thanks, Antonio. I assume NovoReis circuit just lacks the freewheeling diodes because he was thinking about the gate driver side. I almost forgot them, too
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Flyback Driver, Half-bridge
