| 摘要 |
A resistive load, such as a discharge lamp, is connected in a circuit which includes a measuring circuit for measuring the instantaneous power absorbed at the terminals of the load. The measuring circuit includes: measuring means for measuring a low voltage at the foot of the secondary of the transformer which supplies a high voltage supply to the load, such that the measured voltage is an analogue of the voltage across the terminals of the load; a second measuring means for measuring the current passing through the transformer secondary in phase with the measured low voltage, this measured current being an analogue of the current passing through the load; rectifier circuits for rectifying the measured current and voltage; and a processing circuit for processing the rectified signals and to produce in response to them an output signal representing the instantaneous power taken by the load.
|
