| 摘要 |
An instrument power controller (120) for adaptively providing an output v oltage VO and an output current IO that together maintain a substantially co nstant electrical output power PO is provided. The controller (120) includes inputs (121) for receiving an input power PI, outputs (122) for providing t he substantially constant output power PO to a variable impedance load L, an d a communication path (126) for receiving a load voltage VL. The instrument power controller (120) is configured to determine an input voltage VI and a n input current II, determine an effective resistance RL of the load L and s et the output voltage VO and the output current IO based on the input voltag e VI, the input current II, and the effective resistance RL. The output volt age VO is substantially independent from the input voltage VI. The output vo ltage VO and the output current IO are varied to maximize a load power PL wh ile maintaining the substantially constant electrical output power PO.
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