Help me understand complementary push pull amp

[nix85]

The problem with this circuit is as a half an H bridge you only get half the power of a hakfl H bridge ! shock horror 

Be aware if you use 2x N channel  Mos fets as per IR2184 totem pole driver, and you pull up the Drain to the supply rail you have a problem!
as that top supply Mosfet cant get an up to 12 volt turn on bias unless you use a an extra pull up bias power supply.

The same applys to bipolar circuits too but at a lower bias voltage.

Also you need to use a pair of charge capacitors between the half bridge - load - split supply or you blow up or over heat
one of the transisters thus blowing them both up.

And my name is (Alen > Alien) close aim it not Adrian, Adrian is some onme else.

So i guessed right, half of the H bridge is missing.

I'd appreciate the diagram of whole H bridge push pull amp.

[citfta]

So i guessed right, half of the H bridge is missing.

I'd appreciate the diagram of whole H bridge push pull amp.

For a full H bridge circuit just create a mirror image of the two transistors on the opposite side of the load with the output connecting to the load instead of the load connecting to ground.  The full H bridge can be used for controlling a motor in either direction or for applying an AC signal to the load.  For the H bridge to work correctly the top transistor on one side is turned on at the same time as the bottom transistor on the other side.  And vice versa to change the direction of current through the load.


The half bridge can also supply an AC signal to the load if you connect an appropriate capacitor between the load and ground.  The cap can charge during the first half cycle and discharge during the last half cycle thus supplying an AC current to the load.

[nix85]

For a full H bridge circuit just create a mirror image of the two transistors on the opposite side of the load with the output connecting to the load instead of the load connecting to ground.  The full H bridge can be used for controlling a motor in either direction or for applying an AC signal to the load.  For the H bridge to work correctly the top transistor on one side is turned on at the same time as the bottom transistor on the other side.  And vice versa to change the direction of current through the load.

I know how full H bridge looks and works from an inverter, still, i want to see push pull amp version.

The half bridge can also supply an AC signal to the load if you connect an appropriate capacitor between the load and ground.  The cap can charge during the first half cycle and discharge during the last half cycle thus supplying an AC current to the load.

That wouldn't work. Cap would start to discharge as soon as charging voltage starts falling from the peak, not when it reaches zero.

Also, you can't assume halfcycles are mirror replicas and even if they were cap would not mirror the original pulse.

[AlienGrey]

I wouldnt let the above comments bother you as in this type of circuit that has inductance coils it will still end up as a sine wave
when its in RESONANCE, way back in the 60's and 70's early transister amplifiers used this cap coupling in the Clive Sincleair
amplifiers and you would never know the difference, and any way Adrian Gusker used the Stalker circuits he uses this type of circuits.

However note in this circuit the top transistor has no full gate bias and will never fully turn on and if a p channel device is used it will add
further complications with the driver circujit.


SIL

[AlienGrey]

One solution would be to change the top totemnpole transister drive to an over  current device or and run the bottom device
as a rail to rail biased device and just limit the current to it's availability.

SIL