| 摘要 |
A switching power supply (102) for a night vision device (100) converts a battery (113) voltage to high DC voltages for powering photocathode (103), screen (105), and micro-channel plate MCP (104) of the night vision device (100). The switching power supply (102) generates and adjusts a photocathode voltage instruction signal having a duty cycle based on the difference between a reference photocathode voltage and the photocathode voltage circuit output voltage. The switching power supply (102) generates and adjusts a screen voltage instruction signal having a duty cycle based on the difference between a reference screen voltage and the screen voltage circuit output voltage. The switching power supply (102) performs automatic brightness control and auto-gating without directly sensing the output load current. |
