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Plural channel analog-to-digital converter, method and meter employing an input channel with a predetermined direct current bias

an analog-to-digital converter and input channel technology, applied in the field of analog-to-digital converters, can solve problems such as data synchronization and other problems, and achieve the effect of data loss

Active Publication Date: 2005-06-23
EATON INTELLIGENT POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] These needs and others are met by the present invention, which introduces a unique direct current offset to one input channel, such as, for example, to one of the alternating current waveforms input by a plurality of input channels of a serial output analog-to-digital (A / D) converter. Hence, by determining the presence of the direct current offset on the proper input channel, lost data may be avoided along with the need to reset and resynchronize the A / D converter.

Problems solved by technology

Whenever there are serial streams of data for a plurality of different channels, synchronization of the data is an issue.

Method used

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  • Plural channel analog-to-digital converter, method and meter employing an input channel with a predetermined direct current bias
  • Plural channel analog-to-digital converter, method and meter employing an input channel with a predetermined direct current bias
  • Plural channel analog-to-digital converter, method and meter employing an input channel with a predetermined direct current bias

Examples

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Effect test

example 1

[0042] The AD73360L A / D converter 40′ is a six-input channel, 16-bit, analog front end including six independent encoder channels corresponding to the six analog inputs 140,142,144,146,148,150. As shown following the analog input 140, each of these channels includes a signal conditioner 158, a switched capacitor programmable gain amplifier (PGA) 160, a sigma-delta analog-to-digital (A / D) converter (ADC) 162 and a decimator 164. An on-board digital filter (not shown), which forms part of the sigma-delta ADC 162, also performs critical system-level filtering. Each of the ADCs, such as 162, corresponds to one of the alternating current signals of the first and second input channels 100,102. A serial I / O port 166 receives digital values from the decimators, such as 164, and provides a suitable interface 167 to a processor (not shown) and / or another cascaded A / D converter (not shown).

[0043] The interface 167 includes a RESET input 168, which receives an active low reset signal, in order...

example 2

[0069] For a metering application, one or two of the single AD73360L A / D converter 40′ of FIG. 3 may be employed to measure the voltages and currents in all phases of a plural-phase power supply (not shown). The simultaneous sampling architecture of the converter 40′ is ideal for this application where simultaneous sampling is critical to maintaining the relative phase information between the plural voltage and current phases. For example, two or more A / D channels may be employed to measure the voltages in each phase via the circuit 152 of FIG. 4. Two or more A / D channels may be employed to measure the current flowing in each phase via the circuit 154 of FIG. 8. Alternatively, any suitable current-sensing isolation amplifiers and / or Hall-effect sensors may be employed. In turn, a suitable processor, such as the DSP 88 of FIG. 2, is employed to perform the mathematical calculations on the digital values provided by the A / D converter 40′.

example 3

[0070]FIG. 13 shows an example meter 350 including an A / D converter 352 having 12 channels 354 for a three-phase power line 353. The channels 354 input three phase voltages VA, VB, VC, one neutral voltage VN, three phase currents IA, IB, IC, one neutral current IN, one ground current IG, and three additional phase voltages VAG, VBG, VCG, which are referenced, for example, on the primary side of a transformer (T) 355. All of the channels 354 are associated with alternating current signals having a direct current value of about zero. All but one or two of these channels 354 are part of first channels 44′, which employ biasing and scaling circuits (BSCs) 356,357, which input a corresponding one of the alternating current line voltage signals and the alternating current line current signals, and which output a corresponding analog output. Preferably, one (or both) of the neutral voltage VN and the ground current IG are associated with a second channel 46′ and biasing and scaling circuit...

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Abstract

A meter for power lines includes first input channels having AC signals with DC values of about zero. A second input channel has an analog output with a predetermined non-zero DC bias value. Plural biasing and scaling circuits input the AC signals and output corresponding analog outputs. Plural analog-to-digital converters input the corresponding analog outputs and output corresponding digital values. A serial output circuit serially communicates the corresponding digital values for a first set of A / D conversions before serially communicating digital values for a subsequent second set of conversions without providing any synchronization of the corresponding digital values for both the first and second sets of conversions. A serial input circuit serially receives the serially communicated digital values and saves the same in a memory. A processor averages the digital values for the channels and determines whether only the average associated with the second channel has the DC bias value.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to analog-to-digital converters and, more particularly, to meters employing analog-to-digital converters for a plurality of alternating current power lines. The invention also relates to a method of analog-to-digital conversion and, more particularly, to such a method that synchronizes serially communicated output digital values from analog-to-digital conversions. [0003] 2. Background Information [0004] Whenever there are serial streams of data for a plurality of different channels, synchronization of the data is an issue. A typical mechanism for resolving this issue is to employ dedicated hardware to provide a suitable synchronization signal. For example, if the starting point of a clock associated with one set of serial data for the different channels of an analog-to-digital (A / D) converter is known, then the dedicated hardware can be employed to assure synchronization (and, thus, provide a s...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F3/05H03M1/06H03M1/12H03M3/00
CPCG06F3/05H03M1/0624H03M3/474H03M3/324H03M1/1225
Inventor COX, ROGER W.
Owner EATON INTELLIGENT POWER LTD
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