BIPOLAR ALTERNATIVE TO H BRIDGE

[mickstv]

Can you post up the LTSpice sim, so we can experiment with it....

[Carl-NC]

What's missing?

[moodz]

..redrawn ... so its a H bridge with isolation switches ;-)

[moodz]

.. and here is the dead bug style cct and the flyback waveform ...

The supply voltage is set to 1.24 volts .... the flyback is higher than the simulation maybe because cascode connected mosfets turn off faster :-) ....

the cap and resistor arent doing anything ...ignore them. There is a little switchmode supply to provide the 1.24 volts DC. The green and brown wire supply the gate drive from the CPU ( off screen ).

The red and black wires go to a 300 uH coil.

The blue trace is the flyback 500 nanoseconds approx present at each bipolar transition ....

The yellow trace is one of the gate control inputs. ( there are two 180 degrees out of phase ).

moodz

[moodz]

... here is a little cct I have been playing with recently. Can generate various bipolar current waveforms, fast transitions, easy to drive and power efficient.

moodz.