| 摘要 |
<p>PURPOSE: A method to reduce peak current requirements and an apparatus thereof are provided to reduce a peak current that is drawn by an electronic device. CONSTITUTION: An input(12) provides a power supply device(10) with an AC(Alternating Current). The AC current is first measured by an ammeter(14) and then conditioned, rectified, and filtered, etc. by an AC/DC converter(16). A bulk DC voltage(18) output from the converter is input into a charging control circuit(20). A current measurement signal(15) from the ammeter is also passed to the control circuit. When the control circuit determines that the input current is below a predetermined level, a portion of the bulk DC output is directed through a connection to an energy storage device(24) (such as a battery). An output(26) from the charging control circuit passes into a DC conditioning and distribution circuit(28) before providing an output to an electronic device (load). The output may provide a single DC voltage or a plurality of specific regulated DC voltages. When the control circuit determines, via the measured current value, that the input current has reached the level of the predetermined limit, the control circuit begins to draw current from the energy storage device, for example, through a line. Drawing current from the energy storage device allows more power to be provided by the DC output of the power supply without a further increase in the AC input current. If the power demand of the electronic device (load) continues to increase to the point where the combined current available from the capped AC input and the current from the energy storage device cannot meet the demand, the control circuit can send another control signal(32) to the electronic device or load to cause the demand to be decreased.</p> |
