| 摘要 |
A fluorescent ballast control process for a fixed and variable frame rate method of driving a fluorescent ballast to control the brightness of a fluorescent lamp load over a brightness range. The fixed frame rate process uses a fixed number of pulses in each frame. The variable frame rate process uses a variable number of pulses in each frame. When the two processes are combined, the control is gradual in response to a user control signal (BRIGHT). The transition from the fixed to the variable frame rate control process occurs seamlessly as the variable BRIGHT=BRIGHTxOVER where BRIGHTxOVER is calculated.
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