System, method, and apparatus for a safe powerline communications instrumentation front-end

• US 9,404,943 B2
• Filed: 05/23/2014
• Issued: 08/02/2016
• Est. Priority Date: 11/10/2009
• Status: Active Grant

• Current Assignee: Power Monitors, Inc.
• Original Assignee: Power Monitors, Inc.
• Inventors: Curt, Walter, Mullins, Christopher
• Primary Examiner(s): Nguyen, Vinh
• Application Number:
  US14/285,675
• Publication Number:
  US 20140253097A1
• Time in Patent Office: 802 Days
• US Class Current: 1/1
• CPC Class Codes: G01R 1/30 Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
• CPC Class Codes: H04B 2203/5495 having measurements and testing channel
• CPC Class Codes: H04B 3/546 Combination of signalling, telemetering, protection circuits for remote indication of supply or distribution network condition H02J13/00

Abstract

A safe powerline communications instrumentation front end device including a voltage input for receiving a line voltage from a powerline, a voltage reducer for reducing the voltage of the line voltage, a filtering system for extracting a Power Line Communications (PLC) signal from the line voltage, and an analog output for outputting the PLC signal as an analog signal for communications test equipment.

Claims

1. An apparatus for a safe powerline communications instrumentation front end device comprising:

a voltage input configured to receive a line voltage from a powerline;

a voltage reducer configured to reduce a voltage of the line voltage;

an analog to digital (A/D) converter configured to convert the reduced voltage of the line voltage to a digital sample;

a filtering system configured to extract a Power Line Communications (PLC) signal from the digital sample;

a digital to analog (D/A) converter configured to convert the PLC signal to an analog signal; and

an analog output configured to output the analog PLC signal for communications test equipment.

2. The apparatus of claim 1, wherein the voltage reducer comprises a transformer.

3. The apparatus of claim 1, wherein the voltage reducer comprises a pulse-withstanding divider resistor.

4. The apparatus of claim 1, wherein the Power Line Communications (PLC) signal includes a frequency between 0 and 500 kHz.

5. The apparatus of claim 1, wherein the Power Line Communications (PLC) signal includes a frequency between 1 and 30 MHz.

6. The apparatus of claim 1, wherein the filtering system comprises a passive filtering network comprising at least one filter.

7. The apparatus of claim 6, wherein the at least one filter is one of a bandpass filter, a shelf filter, a notch filter, a comb filter, and a shift/subtract filter.

8. The apparatus of claim 1, wherein the filtering system comprises an active signal processing system.

9. The apparatus of claim 8, wherein the active signal processing system comprises:

a digital signal processor (DSP) configured to filter a digital PLC signal from the digital sample.

10. The apparatus of claim 9, wherein the active signal processing system further comprises a field programmable gate array (FPGA) configured to pre-process the digital sample and post-process the digital PLC signal.

11. An apparatus for a safe powerline communications instrumentation front end device comprising:

a voltage input section comprising;

a voltage input configured to receive a line voltage from a powerline;

a voltage reducer configured to reduce a voltage of the line voltage;

an analog to digital (A/D) converter configured to convert the reduced voltage of the line voltage to a digital signal; and

a communications output configured to output the digital signal; and

a processing section physically separated from the voltage input section, the processing section comprising;

a communications input configured to receive the digital signal;

a digital signal processor (DSP) configured to filter a digital powerline communication (PLC) signal from the digital signal;

a digital to analog (D/A) converter configured to convert the digital PLC signal to an analog signal; and

an analog output configured to output the analog signal for communications test equipment.

12. The apparatus of claim 11, wherein the communications output is a wireless output and the communications input is a wireless input.

13. The apparatus of claim 11, wherein the communications output is a wired output and the communications input is a wired input.

14. A method for testing and analyzing PLC systems using a safe powerline communications instrumentation front end device comprising:

receiving a line voltage;

reducing the voltage of the line voltage;

converting the reduced voltage of the line voltage to a digital sample;

extracting PLC signals from the digital sample;

converting the PLC signal to an analog signal; and

outputting the analog PLC signals for communications test equipment.

15. The method of claim 14 wherein extracting PLC signals comprises filtering the line voltage with a passive filtering network comprising at least one filter before converting the line voltage to a digital sample.