I set up an H-bridge inverter with this circuit.
Some say it is not a proper schematic (I don't know how to produce an more proper schematic as it is quite exactly how I did the experiment), so here is an actual photo of the circuit:
- Top left, under the book, AL10, 6V
- Top right GBF, e(t) square 'logic voltage' 0V / 5V
- Left: logic inverter
- Bottom left: resistors, transistors
- Bottom right: adjustable R and L for the charge.
Transistors are MOSFET IRL2203N controlled by a 0V / +5V square voltage (e(t)). The charge is a 1kohm resistor.
Here is what I get (dark blue is e(t), cyan is -e(t) and red is proportional to ic(t)):
Notice the transient in the charge (by transient I mean that I'm expecting iC (red curve) to be a squared signal but it seems to be more an RL-ish I0(1 - exp(-t/tau)) signal with tau << 1/f).
With a higher frequency, here is what I get (sorry for changing color background):
The transient is even more noticeable.
- Do you know where does the transient come from?
- Did I choose the right transistor to achieve what I want? (I do need a H-bridge with 4 commanded switches but should I go for this transistor, an other, a thyristor, a triac) ?
- The charge I'd like to use in real life is not a purely resistive one but a L+R association. Do I have to change something?