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PM9105AP THREE PHASE POWER/ENERGY METERING MODULE PULSE OUTPUT
FEATURES
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SA9105 APPLICATION NOTE
Performs one, two or three phase power and energy measurement Meets the accuracy requirements for Class 1 AC Watt hour meters Operates over a wide Temperature Range
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Uses current transformers for current sensing Three pulse rate outputs available Protected agianst ESD
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DESCRIPTION The SAMES three phase power/energy metering module, the PM9105AP provides three pulse rate output options, the frequency of which are proportional to the active power consumption. Energy consumption can be determined by the power measurement being integrated over time. The method of calculation takes the power factor into account. The output of this innovative universal three phase power/energy metering circuit is ideally suited for energy calculations in applications using a -controller or mechanical counter. The application utilises the SAMES SA9105APA, SA9105EPA or SA9105FPA three phase power metering integrated circuits for power measurement. The module is supplied configured to operate on 3 x 230V, 3 x 80A mains system. This can be adapted to operate on 3 x 115V, 3 x 80A mains system. Please refer to the resistor selection table shown at the end of the Application Circuit parts list.
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7184 PDS038-SA9105-002 Rev. A 07-01-97
PM9105AP BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS * Parameter Symbol Supply Voltage (Note 1) VAC Storage Temperature Operating Temperature (Note 2) Note 1: Note 2: TSTG TO
Min -25 -10
Max 540 +125 +70
Unit V C C
Voltages are specified with reference to Neutral. The SA9105 integrated circuit is specified to operate over the temperature range -10C to +70C. The module functionality will however depend upon the external components used.
* Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only. Functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability.
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PM9105AP ELECTRICAL CHARACTERISTICS (Over the temperature range -10C to +70C, unless otherwise specified. Parameter Supply Voltage (x3 Phases) (Continuous) Frequency Output Power Consumption1 Note 1: Symbol Min Typ Max Unit VAC 180 230 265 V FOUTX Condition PM9105APE
Refer to applicable IC data sheet 100 m W VDD = 5V
Power consumption specifications exclude power consumed by the current sensors.
CONNECTION DESCRIPTION Designation Description PL5 Voltage Supply connected to Phase 1 Voltage Supply connected to Phase 2 Voltage Supply connected to Phase 3 Voltage Supply connected to Neutral Line (Common) PL6 Power Output: 4Hz at rated current Power Output: 290 Hz at rated current Power Output: 1160 Hz at rated current 0V (Common) PL4 5V DC Supply Voltage 0V DC Supply Voltage CT1 Phase 1 (Direction indicated on PCB) CT2 Phase 2 (Direction indicated on PCB) CT3 Phase 3 (Direction indicated on PCB)
FUNCTIONAL DESCRIPTION 1. Power Calculation In the Application Circuit (see Figure 2), the output currents from the current sensors will be between 0 and 16A. The current input stages saturate at input currents greater than 18ARMS. The mains voltage (mains voltage + 15% - 20%) is used for the power calculation, together with the current information from the current sensors (current transformers). The calculated power for the 3 phases is integrated over time and converted into a corresponding frequency. sames
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PM9105AP For rated conditions, the signals into the current and voltage sensor inputs are set as follows: Current sensor input currents: 16 A RMS Voltage sensor input currents: 14 A RMS Under these conditions, the device generates a pulse rate of 1.16kHz at output FOUT1. 2. Electrostatic Discharge (ESD) Protection The device's inputs/outputs are protected against ESD. The modules resistance to transients will be dependant upon the protection components used. Power Consumption The overall power consumption rating for this power metering application (Figure 2), is under 500mW, excluding the current sensors. Isolation The reference for the unit is connected to neutral. Circuit Description The module is supplied from an external 5V DC supply.
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The Application Circuit (figure 2), details the components required for a three phase power metering module. Terminated current transformers are used as current sensors. The most important external components are: C7, C9, C 10 and C11 are the outer loop capacitors for the integrated oversampling A/D converters. The typical value of C7 is 2.2nF and the value of C9, C10 and C 11 is 560pF. The actual values determine the signal to noise and stability performance. The tolerances should be within 10%. C4, C5, C6 and C8 are the inner loop capacitors for the integrated oversampling A/D converters. The typical value of C4, C5, C6 and C8 is 3.3nF. Values smaller than 0.5nF and larger than 5nF should be avoided. Terminated current sensors (current transformers) are connected to the current sensor inputs of the SA9105 through current setting resistors (R8 ..R 13). The resistor values should be selected for an input current of 16A into the SA9105 at the rated line current.
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PM9105AP The values of these resistors should be calculated as follows: Phase 1: R8 = R9 = (IL1/16A) x R18/2 Phase 2: R10 = R11 = (I L2/16A) x R19/2 Phase 3: R12 = R13 = (I L3/16A) x R20/2 Where ILX = Secondary CT current at rated conditions. R18, R19 and R20 = Termination resistors of the three current transformers. R1 + R1A, R4 and R15 set the current for the phase 1 voltage sense input. R2 + R2A, R5 + P5 and R16 set the current for phase 2 and R3 + R3A, R 6 + P6 and R17 set the current for Phase 3. The values should be selected so that the input currents into the voltage sense inputs (virtual ground) is set to 14A at nominal line voltage. Capacitors C1, C2 and C3 are for decoupling and phase compensation. R14 + P14 defines all on-chip bias and reference currents. With R14 + P14 = 24k, optimum conditions are set. P14 may be varied within 10% for calibration purposes. Any changes to R14 will affect the output quadratically (i.e: R = +5%, FOUT = +10%). XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator frequency is divided down to 1.7897 MHz on-chip to supply the digital circuitry and the A/D converters.
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PM9105AP Figure 1: Connection Diagram
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+ 5V S UP P L Y
P L1 5V C 12 C 13 R7
2 -P IN
28
29 35
VDD
VREF GND
P L5
38
1
R 14 C4
40 39 37
C IN 1 C9 R 21
CON1
C 14
4 -P IN
P L1 R 18
6
R8 C IP P IIN 1
34
14
S A 9 1 1 0 5 AP A
2 -P IN
2 -P IN
2 -P IN
IIN 3 IIP 3 OS C1
IC - 1
XT A L
19 O S C 2
16
VS S
Figure 2: Application for Three Phase Power/Energy Measurement.
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0V P 14
3
C5 0V R3
2 5 30
C IP 1 C IN 2 C 10
36
COP 1 CON2 R2
R1
0V
0V
4 15
C6 C IP 3 C IN P C7
12
C IP 2 C IN 3 COP 2 CON3 C 11
31 13
M AI NS V O L T AG E
CT
S C8 COP P IVP 1 IVP 2
32 33
COP 3 CONP R 15 R 16
R 3A
R 2A
R 1A
+C 1 +C 2 R 17 +C 3
R9
7
P L2 R 19
8
IIP 1 IIN 2 IVP 3
21 22 23 17 18 24 25 26 27
R 10 R 11
9
P L3 R 20
10 11 19
IIP 2
R 12 R 13
P 14
P 14
P L5 0V
4 -P IN
C8
FO U T1 FO U T2 FO U T3 TP 17 TP 18 TP 24 TP 25 TP 26 TP 27
0V
D R -0 1 30 2
0V
PM9105AP
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PM9105AP Parts List for Application Circuit: Figure 2
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
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Symbol IC-1 XTAL R1 R1A R2 R2A R3 R3A R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 P5 P6 P14 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11
Description SA9105APA/SA9105EPA/SA9105FPA Crystal, 3.5795 MHz Resistor, 1%, 1/4W, Metal Resistor, 1%, 1/4W, Metal Resistor, 1%, 1/4W, Metal Resistor, 1%, 1/4W, Metal Resistor, 1%, 1/4W, Metal Resistor, 1%, 1/4W, Metal Resistor, 24k, 1%, 1/4W, Metal Resistor, 22k, 1%, 1/4W, Metal Resistor, 22k, 1%, 1/4W, Metal Resistor, 820, 1%, 1/4W, Metal Resistor, 2.7k, 1%, 1/4W, Metal Resistor, 2.7k, 1%, 1/4W, Metal Resistor, 2.7k, 1%, 1/4W, Metal Resistor, 2.7k, 1%, 1/4W, Metal Resistor, 2.7k, 1%, 1/4W, Metal Resistor, 2.7k, 1%, 1/4W, Metal Resistor, 22k, 1%, 1/4W, Metal Resistor, 1M, 1%, 1/4W, Metal Resistor, 1M, 1%, 1/4W, Metal Resistor, 1M, 1%, 1/4W, Metal Resistor, 2.7, 1%, 1/4W, Metal Resistor, 2.7, 1%, 1/4W, Metal Resistor, 2.7, 1%, 1/4W, Metal Resistor, 820, 1%, 1/4W, Metal Potentiometer, 4.7k Potentiometer, 4.7k Potentiometer, 4.7k Capacitor, electrolytic, 1F, 16V Capacitor, electrolytic, 1F, 16V Capacitor, electrolytic, 1F, 16V Capacitor, ceramic, 3.3nF Capacitor, ceramic, 3.3nF Capacitor, ceramic, 3.3nF Capacitor, ceramic, 2.2nF Capacitor, ceramic, 3.3nF Capacitor, ceramic, 560pF Capacitor, ceramic, 560pF Capacitor, ceramic, 560pF
Detail DIP-40 TV Crystal Note 4 Note 4 Note 4 Note 4 Note 4 Note 4
Note 1 Note 1 Note 1 Note 1 Note 1 Note 1
Note 1 Note 1 Note 1 Multi turn Multi turn Multi turn Note 2 Note 2 Note 2
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PM9105AP Parts List for Application Circuit: Figure 2 (Continued)
Item 41 42 43 Symbol C12 C13 C14 Description Capacitor, ceramic, 100nF Capacitor, ceramic, 820nF Capacitor, ceramic, 100nF Detail Note 3
Note 1: Resistor (R8, R9, R10, R11, R12 and R13) values are dependant upon the selected values of the current transformer termination resistors R18, R19 and R20. Note 2: Capacitor values may be selected to compensate for phase errors caused by the current transformers Note 3: Capacitor (C13) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as possible. Note 4: See the table below detailing the component values for the selected voltage standard. Description Item Symbol Detail 230V 115V * 3 R1 200k 120k 4 R1A 180k 82k 5 R2 200k 120k 6 R2A 180k 82k 7 R3 200k 120k 8 R3A 180k 82k If module is required for 115V operation, the resistors in the above table must be changed to the values shown.
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ORDERING INFORMATION Part Number PM9105AP Description 3 X 230V, 3 X 80A Module
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PM9105AP
Disclaimer: The information contained in this document is confidential and proprietary to South African MicroElectronic Systems (Pty) Ltd ("SAMES) and may not be copied or disclosed to a third party, in whole or in part, without the express written consent of SAMES. The information contained herein is current as of the date of publication; however, delivery of this document shall not under any circumstances create any implication that the information contained herein is correct as of any time subsequent to such date. SAMES does not undertake to inform any recipient of this document of any changes in the information contained herein, and SAMES expressly reserves the right to make changes in such information, without notification,even if such changes would render information contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed by reference to the information contained herein, will function without errors and as intended by the designer.
South African Micro-Electronic Systems (Pty) Ltd P O Box 15888, 33 Eland Street, Lynn East, Koedoespoort Industrial Area, 0039 Pretoria, Republic of South Africa, Republic of South Africa Any Sales or technical questions may be posted to our e-mail address below: info@sames.co.za For the latest updates on datasheets, please visit out web site: http://www.sames.co.za Tel: Fax:
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012 333-6021 012 333-8071 sames
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Int +27 12 333-6021 Int +27 12 333-8071

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