AN3157 Datasheet, PDF (1/26 Pages) STMicroelectronics – STEVAL-IPE010V1 poly-phase demonstration kit

Note:
AN3157
Application note
STEVAL-IPE010V1 poly-phase demonstration kit
for the STPMC1 and STPMS1
Introduction
This application note describes the STEVAL-IPE010V1 poly-phase demonstration kit for the
STPMC1 and STPMS1.The STPMC1 is a metering ASSP implemented through an
advanced 0.35 µm BCD6 technology.
The STPMC1 device functions as an energy calculator in power line systems, using the
Rogowski current transformer and shunt or Hall current sensors. It is used in combination
with one or more STPMS1 devices. It implements all the functions needed in a 1, 2 or 3-
phase energy meter, providing the effective measurement of active and reactive energies,
V_RMS, I_RMS, instantaneous voltage and current-per-phase in 1, 2 or 3-phase wye and delta
services, from 2 to 4 wires.
In a stand-alone configuration the STPMC1, which sends a pulse train signal with a
frequency proportional to the cumulative active power, can directly drive a stepper motor,
therefore implementing a simple active energy meter.
This device can also be coupled to a microprocessor for multi-function energy meters. In this
case, the measured data is read at a fixed time interval from the device internal registers by
the microcontroller through the SPI interface.
The STPMS1 is an ASSP designed as a building block for single or multi-phase energy
meters. It consists of a pre-amplifier and two 1st order ΔΣ modulators, band-gap voltage
reference, a low-drop voltage regulator and DC buffers in its analog section, and a clock
generator and output multiplexer in its digital section.
The demonstration kit is made up of a main board with the STPMC1 mounted, and it can be
coupled with up to 5 daughterboards, each with an STPMS1 mounted to sense the voltage
and current of each phase.
The demonstration kit is available on request.
Figure 1. Demonstration kit block diagram
N RST
Cur r ent
Sens or
Vol t age
Sens or
S T PMS 1
r ent
ns or
t age
Sens or
Cur r ent
ns or
t age
ns or
S T PMS 1
S T PMS 1
VOT P MON MOP L E D
S CS
VCC
DAR
S YN- NP
DAS
S T PMC1 ^{SCL- NC}
P1
DAT
S DA- T D
DAN
DAH
CL K
XTAL 1
VDD
XTAL 2 VS S VS S A
Cur r ent
Sens or
S T PMS 1
April 2010
Doc ID 17105 Rev 1
1/26
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