Iqbal, Sajid; et al. (2014). "Study of bifurcation and chaos in dc-dc boost converter using discrete-time map". 2014 International Conference on Mechatronics and Control (ICMC). IEEE International Conference on Mechatronics and Control (ICMC'2014) 2014. pp. 1813–1817. doi:10.1109/ICMC.2014.7231874. ISBN978-1-4799-2538-4.
There is at least one example of a very large (three refrigerator-size cabinets) and complex pre-transistor switching regulator using thyratron gas-filled tubes, although they appear to be used as regulators rather than for DC-to-DC conversion as such. This was the 1958 power supply for the IBM 704 computer, using 90 kW of power.[1]
