PM9109BFA Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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PM9109BFA

MONOCHIP SINGLE PHASE BIDIRECTIONAL KILOWATT HOUR METERING MODULE

South African Micro Electronic Systems 

PM9109BF

FUNCTIONAL DESCRIPTION

1. Energy Calculation

This Application Note should be read in conjunction with the SA9109B Data Sheet.

In the Application Circuit (see Figure 2), the output current from the current sensor

will be between 0 and 16µA (0 to 80A through a shunt resistor of 625µΩ). The

current input stage of the module saturates at input currents greater than

18µARMS. The mains voltage + 15% - 20%) is used to supply the circuitry with

power and to perform the energy calculation, together with the current information

from the current sensor (shunt resistor).

The SA9109BF integrated circuit may be adjusted to accommodate any voltage or

current values. The method for calculating external component values is described

in paragraph 9 (Circuit Description).

The accumulated energy is directly displayed on a 7 digit LCD. This unique

application offers a host of additional features, which are dealt with below.

2. Electrostatic Discharge (ESD) Protection

The device's inputs/outputs are protected against ESD according to the Mil-Std

883C, method 3015. The modules resistance to transients will be dependant upon

the protection components used.

3. Power Consumption

The overall power consumption rating for this power metering application (Figure

2), is under 600mW, excluding the current sensor, when the supply is taken directly

from the mains.

4. Isolation

The programming interface and pulse output are isolated from the module which

is at mains potential, via opto-couplers. (In the event of the use of a current

transformer for current sensing, the opto-couplers would not be required).

5. Isolated Programming Interface

This isolated interface is provided to allow the user to programme the tariff register

values, calibration constants and manufacturer/meter identification codes. This

port is enabled by inserting the jumpers J8, J9 and J10. The programming may be

performed via the parallel port of a personal computer.

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