| 摘要 |
The object of the invention is to interface a device to a bus carrying power and a signal while simultaneously complying with bus-standard current draw limits, storing power for the device in an energy storage device located in the interface apparatus, and conditioning the bus signal as a function of the energy level of the signal received by the interface device from the bus and the level of energy measured in the energy storage device in the interface apparatus. As shown in FIG. 29, according to one aspect of the invention the interface apparatus (472) includes an input filter (480), a current limiter (482), a power converter (483), an energy storage device (484), a signal decoder/controller (486) and a signal conditioner (488). In operation, power flows from the bus through input filter (480) through the current limiter (482) to the power converter (483), which converts the power to a form suitable for charging the energy storage device (484). The output of the energy storage device provides power to the device. The bus signal is received by the signal decoder/controller (486), which performs any necessary decoding before sending the signal onto the signal conditioner (488). Signal decoder/controller (486) also is connected to and controls power converter 483. Signal conditioner (488) measures the level of energy stored in energy storage device (484) then generates and conveys to the signal input of the device an output signal that is a function of the energy level of the bus signal and the measured level of energy in the energy storage device (484).
|
