1-kV power supply


Posted on Mar 2, 2013

Designing a high-voltage switching power supply that can produce a sustained arc can be challenging. This compact and efficient design delivers 1 kV at 20W and can withstand a continuous arcing, or short-circuit, condition (Figure 1). It uses standard, commercially available components. R1 sets the LTC1871 switching-regulator controller for a nominal operating frequency of 120 kHz.



The circuit operates as a discontinuous flyback structure, producing 333V across C1. The diode/capacitor charge-pump multiplier triples this voltage to create 1000V at the output. Figure 2 shows the switching waveforms. When the primary switch, Q1, is on,




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