| 摘要 |
An arrangement ( 900 ) and method ( 1000 ) for providing power line communication from an AC power source ( 910 ) to a circuit ( 900 ) for supplying power to a load ( 960 ), as well as electronic ballasts ( 20,30,40,70,80 ) that operate according to the method ( 1000 ). Method ( 1000 ) includes the steps of: providing ( 1010 ) an AC power source ( 910 ) that includes hot, neutral, and ground wires ( 10,12,14 ) and a control station ( 914 ) for generating a power line carrier control signal; providing ( 1020 ) a power supply circuit ( 920 ) having an EMI filter ( 930 ), power processing circuitry ( 940 ), and a power line communication (PLC) circuit ( 950 ); setting ( 1030 ) a fundamental frequency of the power line carrier control signal to be about equal to either an effective common-mode resonant frequency of the EMI filter ( 930 ) or a harmonic thereof; injecting ( 1040 ) a power line carrier control signal between the neutral and ground wires ( 12,14 ) of the AC power source ( 910 ); detecting ( 1050 ) the power line carrier control signal by monitoring a current flowing from the ground wire ( 14 ) to a circuit ground ( 90 ); and directing ( 1060 ) the power processing circuitry ( 940 ) to control load power in dependence on the detected power line carrier control signal. Specific preferred embodiments are directed to electronic ballasts ( 20,30,40,70,80 ) that include various PLC circuits ( 300,400,500,700 ).
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