Simulation

2. First inverting flyback topology converter ( DC 24V/DC -48V)


Circuit schematic	Schematic with 555 generated pulses	Sawtooth voltage>0 determines square wave period duration

Notice how this circuit now has an inductor with dual coils (an isolation transfomer). The primary coil will charge up with energy thanks to the switching action of the transistor. When the switch is off, the energy will be transferred to the secondary coil twice as fast, thus providing the load with twice as much voltage. Observe that the diode is now allowing the flow of current in the counter-clockwise direction through the load (because a negative output voltage is required).