1-kV power supply produces a continuous arc

A compact circuit design that delivers 1kV power supply at 20 W and can withstand a continuous arcing or short circuit condition is described. The circuit uses standard, commercially available components such as LTC1871 switching regulator controller. The circuit operates as a discontinuous flyback structure, producing 333V across capacitor. It also contains two active circuits and one passive element for current limit protection. The circuit provides an efficiency of about 87.3% at 12V input and a full load of 20 W and increases to 87.7% with an overload of 24 W.