Royer converter

One of the DC-DC converters invented by Dr. Royer. A circuit that looks similar and is easy to confuse with it is the inverter circuit for cold cathode tubes, but that is a collector resonant circuit and operates on a different principle. It uses a large transformer and saturates the core to perform phase inversion, resulting in very large hysteresis loss and the disadvantage that the oscillation frequency cannot be made high. At the same time, losses are high due to heat generated by the pulsed large current that flows during inversion, leading to poor conversion efficiency. On the other hand, compared with the latest modern DC-DC circuits, it has the advantage of enabling DC-DC conversion with a simple circuit configuration.