| 摘要 |
A method of supplying a DC voltage to a load (10) from a supply circuit (14), where the supplied voltage is controlled in dependence on a control signal generated from a first feedback signal (FB1) indicative of the supplied voltage, comprises the steps of determining a second feedback signal (FB2) indicative of a current supplied from the supply circuit (14); multiplying said first and second feedback signals to obtain a multiplied signal; and generating said control signal from said multiplied signal. In this way, the output will be regulated to keep the product of the supplied voltage and the supplied current constant. The power is proportional to this product and will thus also be maintained constant. When the input voltage is considered to be constant, the input current will be maintained constant, and thus variations in the load current are prevented from being transferred to the input side of the power supply.
|
