SWITCHED MODE NIGHT VISION DEVICE POWER SUPPLY
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United States of America Patent
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Issued Date -
Jan 2, 2014
app pub date -
Jul 2, 2012
filing date -
Jul 2, 2012
priority date (Note) -
Abandoned
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Abstract
A night vision device with a switching power supply and a method of powering a night vision device with switching circuits are provided. The switching power supply converts a battery voltage to high DC voltages for powering photocathode, screen, and MCP of the night vision device. The switching power supply generates and adjusts a photocathode voltage instruction signal having a duty cycle based on the difference between a reference photocathode voltage and the output voltage of the photocathode voltage circuit. The switching power supply generates and adjusts a screen voltage instruction signal having a duty cycle based on the difference between a reference screen voltage and the output voltage of the screen voltage circuit. The switching power supply performs the automatic brightness control and auto-gating without directly sensing the output load current.
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