| 主权项 |
1. A power supply for a field emission lighting source, comprising:
a DC-DC converter configure to receive a source of direct current at a first voltage level, at an input of the DC-DC converter, and to provide a direct current at a second voltage level, at an output of the DC-DC converter, the second voltage level being higher than the first voltage level; a resonant inverter comprising a transformer, the resonant inverter connected to the output of the DC-DC converter and configured to provide a pulsating signal at a first frequency having a third voltage level, the third voltage level being higher than the second voltage level, and a voltage multiplier rectifying the pulsating signal to a direct current at a fourth voltage level, the fourth voltage level being higher than the third voltage level, the voltage multiplier comprising a pair of output terminals for connecting to the field emission light source, wherein the power supply further comprises a control unit for controlling the resonant inverter based on a feedback relating to the operation of the field emission light source provide from the voltage multiplier, wherein the control unit is further configured to apply a PWM control of the resonant inverter for suppressing one or a plurality of pulses of the pulsating signal for adjusting the fourth voltage level provided to the field emission light source, and wherein a base frequency for the PWM control is selected as a multiple of a rectified mains signal provided to the DC-DC converter. |
