App note: HV boost power supply for Nixie tubes

Here is a app note from Microchip describing how to implement a high-voltage boost DC-DC converter intended for Nixie tube designs. The basic principle of Nixie tubes is that they require more than 170V to function properly.

This design uses the internal PWM generator of a PIC16 microcontroller to drive the DC-DC converter. A comparator controls the PWM pules to the converter. One side of the comparator is connected to a internal DAC, and the feedback output voltage from the power supply is connected to the other. Slow output voltage increase is achieved by varying the DAC output.

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  1. actually the comparator and DAC provide the stabilization. But I agree this is a poor power supply design, but on the other hand it is more then adequate for nixie tubes

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