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PM9102AP SINGLE PHASE POWER/ENERGY METERING MODULE PULSE OUTPUT
FEATURES
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SA9102 / SA9602 APPLICATION NOTE
Performs both power and energy measurement Meets the accuracy requirements for Class 1 AC Watt hour meters Protected against ESD
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Total power consumption rating below 500mW (excluding current sensing) Uses a shunt resistor for current sensing Operates over a wide temperature range
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DESCRIPTION The SAMES single phase power/energy metering module, the PM9102AP, provides two pulse rate output options, the frequency of which are proportional to the active power consumption. Energy consumption is 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 power/energy metering circuit is ideally suited for energy calculations in applications using a -controller or mechanical counter. The application utilises the SAMES SA9102CP, SA9102FP, SA9102HP, SA9602EP (DIP-20), SA9602HP (DIP-20) or SA9602MP power metering integrated circuits for power measurement. As a safety measure, this application shows the current sensor connected to the neutral line. In practice, the live line may be used for current sensing, provided that the supply connections (MAINS) are reversed on the module. BLOCK DIAGRAM
IN OUT SHUNT SA9102 SA9602 OCTO COUPLER POWER OUTPUT POWER METER
DR-01447
NEUTRAL NEUTRAL NEUTRAL LIVE
POWER SUPPLY VOLTAGE SENSE
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4308 PDS038-SA9102-001 REV.C 06-08-98
PM9102AP ABSOLUTE MAXIMUM RATINGS* Parameter Supply Voltage (Note 1) Current Sense Input (Note 1) Storage Temperature Operating Temperature (Note2) Max Current through Sensor Note 1: Note 2: Symbol VAC VIV TSTG TO IMAX IMAX Min -2.5 -25 -10 Max 540 +2.5 +125 +70 800 (Note 3) 2000 (Note 4) Unit V V C C A A
Note 3: Note 4: *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 operational sections of this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability.
Voltages are specified with reference to Live. The SA9102 and SA9602 integrated circuits are specified to operate over the temperature range -10C to +70C. The module functionality will however depend upon the external components used. t = 500ms t = 1ms
ELECTRICAL CHARACTERISTICS (Over the temperature range -10C to +70C, unless otherwise specified. Power consumption figures are applicable to the PM9102APE only.) Parameter Symbol Min Typ Max Unit Condition Supply voltage VAC 180 230 265 V PM9102APE (Continuous) 90 115 135 V PM9102APA Frequency output FOUTX Refer to applicable IC data sheet 1 Power consumption 800 mW VAC = 230V Supply direct from mains 200 mW 5VAC supply 2 Isolation voltage VIS 2500 V Continuous Output transistor collector current IO 10 mA VOL =1V Note 1: Power consumption specifications exclude power consumed by the current sensor.
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PM9102AP Note 2: Isolation voltage may be specified, depending on customer requirements. CONNECTION DESCRIPTION Description Voltage supply connection to Neutral line Voltage supply connection to Live line Neutral In Connection to positive side of current sensor Neutral Out Connection to negative side of current sensor JP1 SA9102/SA9602 output pin selector (Jumper) SK1 Power measurement output FUNCTIONAL DESCRIPTION 1. Power Calculation In the Application Circuit (Figure 2), the output current from the current sensor will be between 0 and 16A (0 to 80A through a shunt resistor of 625S). The current input stage saturates at input currents greater than18A RMS. The mains voltage (230V + 15% -20%) is used to supply the circuitry with power and for the power calculation, together with the current information from the current sensor (shunt resistor). The SA9102CP, SA9602EP (DIP-20), SA9602HP (DIP-20) and SA9602MP integrated circuits may be adjusted to accommodate any voltage or current values. The method of calculating external component values is described in paragraph 5 (Circuit Description). SAMES offers evaluation module options, namely 230V/80A and 115V/80A. The calculated power is integrated over time and converted into a corresponding frequency. The frequency is transmitted as a pulse rate through an opto-coupler. 2. Electrostatic Discharge (ESD) Protection The device's inputs/outputs are protected against ESD according to Mil-Std 883C, method 3015. 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 sensor, if a supply is taken directly from the mains. Isolation The pulse output is isolated from the module, which is at mains potential, via an opto-coupler. (In the event of the use of a current transformer for current sensing, an opto-coupler would not be required.) Designation MAINS
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PM9102AP
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Circuit Description The Application Circuit (Figure 2) details the components required for the power metering module, using a shunt resistor for current sensing. In this application the device requires +2,5V, 0V, -2,5V DC supply. The most important external components are: C1 and C2 are the outer loop capacitors for the two integrated oversampling A/D converters. The value of these capacitors is 560pF. The actual values determine signal to noise and stability performance. The tolerance should be within 10%. C3 and C4 are the inner loop capacitors of the A/D converters. The optimum value is 3.3nF. The actual values are uncritical. Values smaller than 0.5nF and larger than 5nF should be avoided. R2, R1 and RSH are the resistors defining the current level into the current sense input. The values should be selected for an input current of 16ARMS into the SA9102 / SA9602 at maximum line current. Values for RSH of less than 200S should be avoided. R1 = R2 = (IL/16ARMS) * RSH/2 Where IL = Line current Shunt resistor/termination resistor RSH =
R3, R6 and R4 set the current for the voltage sense input. The values should be selected so that the input current into the voltage sense input (virtual ground) is set to 14ARMS. R7 and P7 defines all on-chip bias and reference currents. With R7 + P7 = 24kS, optimum conditions are set. R7 + P7 may be varied by 10% for calibration purposes. Any change to R7 + P7 will affect the output quadratically. XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator frequency is divided down to 1.7897MHz on-chip and supplies the A/D converters and the digital circuitry.
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PM9102AP Figure 1: Connection Diagram
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PM9102AP
Figure 2: Application using a Shunt Resistor for Current Sensing.
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PM9102AP Parts List for Application Circuit: Figure 2 Item Symbol Description 1 IC-1 SA9102CP/EP/FP/HP / SA9602EP/HP/MP 2 IC-2 Optocoupler, 4N35 3 D1 Diode, Silicon, 1N4148 4 D2 Diode, Silicon, 1N4148 5 ZD1 Diode, Zener, 2.4V, 200mW 6 ZD2 Diode, Zener, 2.4V, 200mW 7 XTAL Crystal, 3.5795MHz 8 R1 Resistor, 1.6kS, 1%, metal 9 R2 Resistor, 1.6kS, 1%, metal 10 R3A Resistor, 1%, metal 11 R3B Resistor, 1%, metal 12 R4 Resistor, 1MS, 1/4W, 1%, metal 13 R5 Resistor, 470S, 2W, 5%, carbon 14 R6 Resistor, 24k, 1/4W, 1%, metal 15 R7 Resistor, 22k, 1/4W, 1%, metal 16 P7 Trimpot, 5kS 17 R8 Resistor, 680S, 1/4W, 5% 18 R9 Resistor, 680S, 1/4W, 5% 19 R10 Resistor, 680S, 1/4W, 5% 20 C1 Capacitor, 560pF 21 C2 Capacitor, 560pF 22 C3 Capacitor, 3.3nF 23 C4 Capacitor, 3.3nF 24 C9 Capacitor, 100nF 25 C10 Capacitor, 100nF 26 C11 Capacitor, polyester 27 C13 Capacitor, 100F, 16V 28 C14 Capacitor, 100F, 16V 29 C15 Capacitor, 820nF 30 JP1 Jumper 31 RSH Shunt Resistor, 80A, 50mV (625S) Detail DIP-20 DIP-6
Colour burst TV Note 1 Note 1 Note 2 Note 2
Multi turn
Note 2
Note 3 Note 1
Note 1 : Resistor (R1 and R2) values are dependant upon the selected value of RSH. See paragraph 5 (Circuit Description) when selecting the value for RSH. Note 2 : See the table below, detailing the component values for the selected voltage standard. Note 3 : Capacitor (C15) to be positioned as close as possible to Supply Pins (VDD & VSS) of IC-1. sames
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PM9102AP Description PM9102APA PM9102APE 115V 230V 120kS 200kS 82kS 180kS 1F 0.47F
Item 10 11 26
Symbol R3A R3B C11
Detail
ORDERING INFORMATION Part Number PM9102APA PM9102APE Description 115V, 80A Module 230V, 80A Module
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PM9102AP Notes:
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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.
Any Sales or technical questions may be posted to our e-mail address below: energy@sames.co.za For the latest updates on datasheets, please visit out web site: http://www.sames.co.za 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
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012 333-6021 012 333-8071 sames
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