ILA19002

Korzhenevskogo 12, Minsk, 220108, Republic of

Belarus

Fax:

+375 (17) 278 28 22,

Phone: +375 (17) 278 07 11, 212 24 70, 212 24 61,

212 69 16

E-mail: office@bms.by

URL: www.bms.by

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FUNCTIONAL DESCRIPTION

The ILA19002 is a CMOS mixed signal Analog/Digital integrated circuit, which performs

power/energy calculations across a power range of 1000:1, to an overall accurancy of better

than Class 1.

The integrated circuit includes all the required functions for 1-phase power and energy

measurement such as two oversampling A/D converters for the voltage and current sense

inputs, power calculation and energy integration. Internal offsets are eliminated through the

use of cancellation procedures. The ILA19002 generates pulses, the frequency of which is

proportional to the power consumption. The pulse rate follows the instantaneous power

consumption measured. Direction information is also provided.

A voltage zero crossover signal, relevant to the positive going half cycle, is available on pin

FMO. This signal can be used to synchronise circuit breaker switching.

1. Power Calculation

In the Application Circuit (Figure 1), the voltage drop across the shunt will be between

Ω). This voltage is

The current sense input saturates at an input current of ±25µA peak.

For the voltage sensor input, the mains voltage (230VAC) is divided down through

mains voltage, via resistor R4 (1M

Ω).

In this configuration, with a mains voltage of 230V and a current of 80A, the output

frequency of the ILA19002 power meter chip at FOUT is 1.16kHz. In this case 1 pulse

will correspond to an energy consumption of 18.4kW/1160Hz = 15.9Ws.

2. Analog Input Configuration

The input circuitry of the current and voltage sensor inputs are illustrated below.

These inputs are protected against electrostatic discharge through clamping diodes.

shorts on the signal inputs. Exact duplications of the input currents are generated

for the analog signal processing circuitry.

3. Electrostatic Discharge (ESD) Protection

The ILA19002 integrated circuit's inputs/outputs are protected against ESD

4. Power Consumption

The power consumption rating of the ILA19002 integrated circuit is less than 25mW.

5. Pulse Output Signals

The diagram below shows the behavior of the instantaneous pulse output, FOUT,

with respect to the power consumption.