11/10/2023 0 Comments Hollow cathode lamp drawing![]() I also have one with a voltage doubler attached but the voltage is almost too high although it is adjustable and the current is kinda too low. I don't think it's a type of oscillator as the voltage is variable and by the sound of it it's a simple flyback architecture with variable frequency, however the transformer has no diode, just a few output caps. ![]() I didn't design or build it, that would have been more expensive. It is one of those small modules you can buy for cheap. Make sure to keep trace / wire spacing in mind, as creepage and arcing are a problem at these potentials. I recommend using components that are rated for 1200v just to be extra safe, but 600v or 630v components would probably be sufficient. You'll need a current limiting resistor unless you carefully design your current-mode control loop. It's pretty straightforward as long as the load and input are relatively constant, and you pay special attention to layout and component breakdown ratings. I recently designed a DCM boost converter to drive a neon display with a strike voltage of 200v and a current draw of a few milliamps using a UC3845 PWM controller. I would either use a regular boost converter designed to operate in DCM, a coupled-inductor boost converter (or the very similar flyback converter topology), a quasi-resonant boost converter, or a boost converter plus a capacitive multiplier stage (or additional boost converter stages). That said, ZVS, in the context of hobbyist circles, typically refers to Royer oscillator topologies, which may be suitable for this purpose but would not be my first choice. Almost any basic SMPS topology can be controlled in a way that can be construed as ZVS. ![]() In this case, ZVS is kind of a misnomer because it's really a broad class of control methods.
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