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PDF PM2005FPD Data sheet ( Hoja de datos )
| Número de pieza | PM2005FPD | |
| Descripción | Evaluation Module For The SA2005FPA Metering IC | |
| Fabricantes | South African Micro-Electronic Systems | |
| Logotipo |  |
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Evaluation Board for the SA2005F Energy
Metering IC
PM2005FPD
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FEATURES
+ Designed to be used as a fully functional Watt-Hour meter.
+ Better than Class 1 operation
+ On-board power supply
+ 3 Phase 4 Wire configuration
+ On-board current transformers
+ Can be used with external micro controller for calibration
and different pulse rates
DESCRIPTION
The SA2005F IC is an enhancement of the SA9105F.
The PM2005FPD evaluation board provides energy data via
an isolated pulse output for three-phase four-wire applications
using the SA2005F. The mains voltages easily connect to the
module by way of a Molex connector (SK1). The 3 on-board
current transformers measure the current in each phase. A
simple capacitive power supply supplies the energy metering
IC with power. The LM431 regulators are used to generate 5V
supply voltage for the IC on the board.
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SK1
GND
Power
Supply
VDD
GND
VSS
CT1 Resistor
Network
CT2 Resistor
Network
SA2005F
12
13
FOUT
CT3 Resistor
Network
VDD VSS
Module Setup
Jumpers
Figure 1: Block diagram
OPTO
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PM2005FPD
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POWER SUPPLY
Referring to figure 10, capacitor C10 is charged through D2
during the positive half of the sine wave from the R29, C12
mains voltage dropper. Identical charging circuitry exists for
the other two phases. During the negative sine wave, C11 is
charged through diode D1. The unregulated voltage charged
on C10 and C11 is limited to 47 V by means of zener diode D7.
Resistors R32 and R33 act as current limiting resistors that
feed the unregulated voltage to the positive and negative
voltage regulators U3 and U4. The voltage regulators need a
load capacitance of around 10µF (C8 and C9) to be in a stable
operating region. C15 acts as a supply voltage storage
capacitor.
Jumpers J4, J5 and J7 allow the power supply to be completely
disconnected form the metering section from the device.
Ground Plane
The GND pin of the SA2005 is connected to the neutral phase,
which is halfway between VDD and VSS. Note that supply
bypass capacitors C4 and C5 are positioned as close as
possible to the supply pins of the SA2005, and connected to a
solid ground plane. Capacitor C6 is positioned as close as
possible to the supply pins of the device for proper supply
bypassing.
Power Supply routing and de coupling
The 5V supply is de-coupled and routed directly to the power
pins of the IC by means of capacitor C5. Care is taken not to
have current flowing in the node that connects the voltage
reference resistor to VSS as it may introduce power supply
noise on the voltage reference circuit.
Signal Routing
PCB DESIGN
Most of the signal routing is done in such a manner that any
The module represents a Class 1 meter that is designed to
signal coupling in to the measured signal will be a common
demonstrate the functionality and performance of the
mode noise signal and is rejected subsequently. Care should
SA2005F metering circuits. The SA2005F is a single chip
be taken that the signals to the SA2005 is not influenced by
solution for a three-phase meter with both fast and slow output.
other sources such as transformers with electric fields
When the meter PCB is designed, it should be taken into
coupling in to the signals.
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and special care should to be taken with the power supply and
CALIBRATION
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signal routing to the device.
Calibration can be done by adjusting the trimpots (P1, P2, P3)
Protection
connected tot he three voltage inputs.
The SA2005 should be protected from its measuring
environment. This is achieved by using resistor dividers to
scale all the SA2005 input signals. MOV's Z1, Z2, Z3 together
with resistors R29, R30, R31 protects the power supply
capacitors. The current setting resistors on the current sense
inputs of the device attenuates common mode and
asymmetrical transients.
Component placement
All the resistors connecting to the SA2005's current sense
inputs should be placed as close as possible to the SA2005.
This eliminates the possibility of any stray signal coupling into
the divided input signal.
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PM2005FPD
NOTES:
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet PM2005FPD.PDF ] | |
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