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1 kV Power Supply produces a continuous arc: 02/05/04 EDN
Design Ideas / (added 1/05) 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....
1.5A High Efficiency Synchronous Switching Regulator Evaluation Board:
The evaluation board is designed to supply 3.3V at 15 mA up to 1.5A. The input voltage range is 4V to 14V. Components were selected based on
the design procedure in the LM2651 datasheet. PCB layout is critical to reduce noise and ensure specified performance for any power supply
design. (app note added 3/05)
120 Volt AC Lamp Chaser using Solid State Relays: This circuit is similar
to the LED clock using12 neon indicator lamps instead of LEDs. It operates from2 high capacity ni-cad cells (2.5 volts) which keep it going
for a couple weeks. High voltage (70 volts) for the neon lamps is obtained from a small switching power supply using a 74HC14 Schmitt trigger
Squarewave oscillator, high voltage switching transistor, and10 mH high Q inductor. Most any small PNP transistors can be used that have a C/E
voltage rating of 80 or more. (added 4/02)
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