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US 6,205,043 B1Granted
Power supply with air core transformer and seperated power supplies for high dynamic range
AssigneeCalifornia Institute of Technology
InventorsAra Chutjian, Dean Aalami, Murray Darrach, Otto Orient
Life of this patent
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Abstract
A power supply for a quadrupole mass spectrometer which operates using an RF signal. The RF signal is controllable via a feedback loop. The feedback loop is from the output, through a comparator, and compared to a digital signal. An air core transformer is used to minimize the weight. The air core transformer is driven via two out of phase sawtooth signals which drive opposite ends of the transformer.
Claims6
A high dynamic range power supply, comprising:
- an oscillator assembly operating from a first power supply and produce first and second out-of-phase signals which have a gradually increasing portion;
- first and second transistors, coupled to receive said first and second signals respectively, and turned on by said signals to produce an oscillating output, wherein said first transistor produces a first part of the oscillating output and said second transistor produces a second part of the oscillating output;
- a feedback loop, including a detector sensing a level of the oscillating output and producing a signal indicative thereof, a second element comparing said signal to a reference and producing an error output indicative of the difference, said error output causing a change in said first and second drive signals;
- wherein said first transistor is referenced to a second power supply, having a different level than said first power supply.
1 more element
A high dynamic range power supply, comprising:
- an oscillator assembly operating from a first power supply and produce first and second out-of-phase sawtooth shaped signals;
- first and second transistors, coupled to receive said first and second signals respectively, and turned on by a level of said signals increasing above a specified level, to produce an oscillating output, wherein said first transistor produces a first part of the oscillating output and said second transistor produces a second part of the oscillating output;
- an air core transformer, having a primary driven at a first end by said first part, and driven at said second end by said second part;
- and
- a feedback loop, including a detector sensing a level of the oscillating output and producing a signal indicative thereof, a second element comparing said signal to a reference and producing an error output indicative of the difference, said error output causing a change in said first and second drive signals;
- wherein said first transistor is referenced to a second power supply, having a different level than said first power supply.
3 more elements
Dependencies are inferred from the claim text.