Mass Spectrometer Power Supplies Using a Silicon Controlled A. C. Switch

抄録

Several circuit diagrams are presented for mass spectrometer power supplies. In all cases, the principal control element is a silicon controlled A. C. switch(TRIAC) which determines the duty cycle of the primary line power to the supply. The pulse oscillator with integrated circuit amplifier, required to drive the TRIAC, is also common to all supplies. It is mounted on a plug-in printed circuit board. It is a null sensing device;that is, its input voltage and current are both zero at balance. The phase of the pulse train is locked to the phase of the line voltage, and the position of the pulses in time determines the duty cycle. The circuits presented show the use of the TRIAC in a solid source(triple)filament current supply, an emission regulator for gas source mass spectrometers, a magnet current supply, and a vacuum gauge supply.