| 摘要 |
<p>A ballast for providing power to a high intensity discharge lamp includes a first sensor and a control subsystem. The first sensor generates a first signal indicative of a current level in the ballast. The control subsystem computes a real time power level of the ballast based at least upon the first signal, compares the computed real time power level to a specified power level, and modifies a frequency of operation of the ballast in response to the comparison. The first sensor can measure the current level at an output of the ballast. The ballast can also include a second sensor that generates a second signal indicative of a voltage output of the ballast, The control subsystem can compute the real time power level of the ballast based upon the second signal.</p> |
