Digital communication over 28VDC power line
First Claim
1. A power line modem interface comprising:
- a modem that modulates an RF signal with digital data;
a filter that is connected to said modem and that couples said RF signal from said modem to a DC power line;
a microcontroller connected in said modem that selects one of at least two channel frequencies for said RF signal that is modulated with said digital data; and
at least two amplifiers and bandpass filters, wherein said at least two amplifiers and bandpass filters operate to receive said RF signal on said at least two channel frequencies.
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Accused Products
Abstract
A power line modem interface includes a modem that modulates an RF signal with digital data and demodulates an RF signal to recover digital data. A filter is connected to the modem and to a DC power line that supplies power to a local power supply. The filter couples the RF signals from the modem to the DC power line and filters the RF signals out of the local power supply. The filter includes: a first inductance connected to a hot side of the DC power line; a second inductance connected in series with the first inductance and connected to the local power supply; and a capacitance with a first plate connected between the first inductance and the second inductance and a second plate connected to the modem so that the RF signal is passed between the modem and the DC power line.
108 Citations
26 Claims
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1. A power line modem interface comprising:
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a modem that modulates an RF signal with digital data; a filter that is connected to said modem and that couples said RF signal from said modem to a DC power line; a microcontroller connected in said modem that selects one of at least two channel frequencies for said RF signal that is modulated with said digital data; and at least two amplifiers and bandpass filters, wherein said at least two amplifiers and bandpass filters operate to receive said RF signal on said at least two channel frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power line modem interface comprising:
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a modem that demodulates an RF signal to recover digital data; a filter connected to said modem and to a DC power line, wherein said filter couples said RF signal from the DC power line to said modem; a microcontroller connected in said modem that selects one of four channel frequencies for said RF signal that is modulated with said digital data; and four amplifiers and bandpass filters, wherein said four amplifiers and bandpass filters operate to receive said RF signal on said four channel frequencies. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A filter for coupling an RF signal from a modem to a DC power line that supplies power to a local power supply, said filter comprising:
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a first inductance connected to a hot side of the DC power line; a second inductance connected in series with said first inductance and connected to the local power supply; and a capacitance with a first plate connected between said first inductance and said second inductance and a second plate connected to a modem so that said RF signal is passed between the modem and the DC power line. - View Dependent Claims (16)
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17. An avionics unit comprising:
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a host electronics with a dual ported RAM interface; a modem that modulates a first RF signal with first digital data and that demodulates a second RF signal to recover second digital data; a microcontroller that is connected in said modem and that interfaces said modem with said host electronics through said dual ported RAM, said microcontroller receiving said first digital data from said host electronics and said microcontroller sending said second digital data to said host electronics; a filter connected to said modem and to a DC power line wherein said filter couples said first RF signal from said modem to the DC power line and couples said second RF signal from the DC power line to said modem; and
wherein said filter comprises;a first inductance connected to a hot side of the DC power line; a second inductance connected in series with said first inductance and connected to said local power supply; and a capacitance with a first plate connected between said first inductance and said second inductance and a second plate connected to said modem so that said first RF signal is passed from said modem to the DC power line and said second RF signal is passed from the DC power line to said modem; and a local power supply connected to the DC power line and connected to said filter, wherein said filter passes said RF signal to said modem; and
said filter filters out said RF signal from said local power supply. - View Dependent Claims (18, 19)
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20. An avionics system comprising:
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a DC power line that supplies a 28 VDC power; a local power supply connected to a DC return of said DC power line; a host electronics with a dual ported RAM interface; a modem that modulates a first RF signal with first digital data and that demodulates a second RF signal to recover second digital data; a microcontroller that is connected in said modem and that interfaces said modem with said host electronics through said dual ported RAM, said microcontroller receiving said first digital data from said host electronics and said microcontroller sending said second digital data to said host electronics; and a filter connected to said modem and to a hot side of said DC power line wherein said filter couples said first RF signal from said modem to the DC power line and couples said second RF signal from the DC power line to said modem;
said filter connected to said local power supply wherein said filter filters out said RF signal from said local power supply; and
said filter including;a first inductance connected to a hot side of the DC power line; a second inductance connected in series with said first inductance and connected to said local power supply; and a capacitance with a first plate connected between said first inductance and said second inductance and a second plate connected to said modem so that said first RF signal is passed from said modem to the DC power line and said second RF signal is passed from the DC power line to said modem. - View Dependent Claims (21, 22)
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23. A method for digital communication over a DC power line comprising steps of:
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modulating an RF signal with digital data at a first modem; coupling said RF signal from said first modem to said DC power line through a filter, including; connecting a first inductance and a second inductance to each other in series in said DC power line; connecting a first side of a capacitor between said first inductance and said second inductance; connecting a second side of said capacitor to said modem; propagating said signal through said capacitor onto said power line; coupling said RF signal from said DC power line to a second modem through a second filter; and demodulating said data from said RF signal at said second modem. - View Dependent Claims (24, 25, 26)
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Specification