| 摘要 |
In a computer system in which adapter cards can be "hot plugged" into an I/O bus connector, a serially connected resistor and "voltage feedback" switch is coupled between the power supply pin of each I/O connector and the power supply input port that regulates the voltage at the output port of the power supply. Another resistor, which has a resistance greater than each of the resistors coupled to the I/O connectors, is connected between the input and output ports of the power supply to provide voltage feedback to regulate the output voltage of the power supply in the event that power to all of the I/O connectors is switched OFF. The power to an individual I/O connector is turned OFF before an adapter card is plugged into or removed from an I/O connector, and the power is turned ON immediately after the card is plugged into the connector. Each of the voltage feedback switches is turned ON by a controller a short time after the power to the I/O connector is switched ON, and each of the feedback switches is turned OFF shortly before power to the I/O connector is turned OFF. When power is turned ON to more than one I/O connector, the voltage at the input port of the power supply is the average of the voltages at the power supply pins of the I/O connectors that are turned ON. This switched, feedback arrangement permits the average power supply voltage at the individual I/O connectors to be held within a close tolerance of "spec", and the deviation of the voltage at any one I/O connector from "spec" to be minimal.
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