ATT7030A Datasheet PDF - hitrendtech

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ATT7030A
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Part Number ATT7030A
Description Application Note
Page 14 Pages


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ATT7030A Application Note(260-CS-105)
ATT7030A
Application Note
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ATT7030A Application Note(260-CS-105)
Directory
ATT7030A features:················································································································································3
Analog input circuitry ·············································································································································4
Energy pulse output circuitry ··································································································································5
Power supply circuitry ············································································································································9
ATT7030A work state whether or not right ·············································································································9
PCB layout ··························································································································································· 10
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ATT7030A Application Note(260-CS-105)
This application note describes the implementation of a multifunctional three-phase energy meter
using the ATT7030A. Please peruse ATT7030A’s user manual before reading this application note.
ATT7030A features:
• Active energy measure accord with IEC 62053-21;
• Selectable calculation mode for 3-phase energy combined (algebraic addition or absolute addition);
• Provide high-frequency energy pulse output;
• Provide pulse output F1/F2 for driving electromechanical counter and stepper motor;
• Provide voltage-lost detected for every phase;
• Provide negative power indication REVP when any one phase active power is negative;
• Provide negative phase indication (NEGP) when 3-phase combined power is negative;
• Compatible with 3-phase 3-wire and 3-phase 4-wire;
The internal block diagram in ATT7030A:
The signal disposal flow chart:
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ATT7030A Application Note(260-CS-105)
ATT7030A’s package is QFP44. The external hardware circuitry includes power supply, voltage
and current analog signal input, pulse output and electromechanical counter.
Analog input circuitry
ATT7030A incorporates 6 second-order 16-bits ADCs. The voltage sampling data is 0.2V ~ 0.6V.
The current sampling data is 2mV ~ 1V. The energy linear error is less than 0.1%.
Every ADC’s AC signal is input from VxP and VxN. At the same time the VxP and VxN need be
added 2.4V direct current bias voltage, which could be obtained from ATT7030A’s reference voltage
output ‘REFOUT’ or external benchmark voltage.
ATT7030A’s sampling input voltage can adopt resistance divided-voltage method (as diagram 1
and diagram 2), or switching voltage to current, then through current mutual inductance implement
switching current to voltage (as diagram 3). The latter method adopt mutual inductance implement,
which can segregate chip and electric power net, thereby can get favorable anti-jamming capability. In
diagram 1, the neutral line Vn is connected to reference voltage output ‘REFO’, which achieves adding
AC sampling signal to 2.4V direct current bias voltage expediently. In diagram 2, the neutral line Vn is
connected to chip’s ground, which is applied to power supply using autotransformer.
Diagram 1: Vn is connected to REFO
Diagram 2: Vn is connected to ground
Diagram 3: current mutual inductance
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