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PM9103AP SINGLE PHASE POWER/ENERGY METERING MODULE SERIAL INTERFACE
FEATURES
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SA9103 / SA9603C APPLICATION NOTE
Performs both power and energy measurement Meets the accuracy requirements for Class 1 AC Watt hour meters Protected against ESD Total power consumption rating below 500mW (excluding current sensing)
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Uses a shunt resistor for current sensing Operates over a wide temperature range Serial interface having a RS232 Protocol
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DESCRIPTION The SAMES single phase power/energy metering module, the PM9103AP, provides energy data via a RS232 compatible serial interface. 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 meter is ideally suited for energy calculations in applications using a -controller. The application utilises the SAMES SA9103CP, SA9103EP or SA9603CP 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.
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4309 PDS038-SA9103-001 REV.C 11-08-98
PM9103AP BLOCK DIAGRAM
IN OUT SHUNT SA9103 SA9603 OPTO COUPLER D-sub CONNECTOR
NEUTRAL NEUTRAL NEUTRAL LIVE
POWER SUPPLY VOLTAGE SENSE
POWER METER
DR-01448
OPTO COUPLER
ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage (Note 1) VAC Current Sense Input (Note 1) VIV Storage Temperature TSTG Operating Temperature TO Max Current IMAX through Sensor IMAX
Min -2.5 -25 -10
Max 540 +2.5 +125 +70 (Note 2) 800 (Note 3) 2000 (Note 4)
Unit V V C C A A
Note 1: Voltages are specified with reference to Live. Note 2: The SA9103 and SA9603C integrated circuits are specified to operate over the temperature range -10C to +70C. The module functionality will however depend upon the external components used. Note 3: t = 500ms Note 4: t = 1ms *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.
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PM9103AP ELECTRICAL CHARACTERISTICS (Over the temperature range -10C to +70C, unless otherwise specified. Power consumption figures are applicable to the PM9103APE only.) Parameter Supply Voltage (Continuous) Power Measurement range Power Consumption1 Symbol VAC P RNG Min Typ Max 265 135 18400 800 Unit V V W mW Condition PM9103APE PM9103APA Specified accuracy VAC = 230V Supply direct from mains Continuous VOL = 1V 180 230 90 115 -18400
Isolation Voltage2 Opto-coupler Output Current Opto-coupler Input Current
VIS IO II
2500 10 10
V mA mA
Note 1: Power consumption specifications exclude power consumed by the current sensor. Note 2: Isolation voltage may be specified, depending on customer requirements. CONNECTION DESCRIPTION Designation Description Voltage supply connection to Neutral line MAINS Voltage supply connection to Live line NEUTRAL IN Connection to positive side of current sensor NEUTRAL OUT SK1 D-sub connector 9-Pin Connection to negative side of current sensor Serial Input Serial Output
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PM9103AP FUNCTIONAL DESCRIPTION 1. Power Calculation In the Application Circuit (see Figure 2), the output current from the current sensor will be between 0 and 16A (0 to 80A through a shunt resistor of 625). The current input stage of the module, saturates at input currents greater than 18ARMS. T h e mains voltage (Voltage + 15% - 20%) is used to supply the circuitry with power and to perform the power calculation, together with the current information from the current sensor (shunt resistor). The SA9103CP, SA9103EP and SA9603C integrated circuits may be adjusted to accommodate any voltage or current values. The method for calculating external component values is described in paragraph 6 (Circuit Description). SAMES offers two evaluation module options, namely 230V/80A and 115V/80A. The calculated power is integrated into a 22 bit integrator, which is accessable via a serial interface having a RS232 protocol. The power calculation takes the power factor into account. 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 500mW, excluding the current sensor, when the supply is taken directly from the mains. 4. Isolation The serial interface is isolated from the module which is at mains potential, via two opto-couplers. (In the event of the use of a current transformer for current sensing, the opto-couplers would not be required.) 5. Serial Interface Reading and resetting of the on-chip integrators may be performed using a Personel Computer (PC). A standard serial cable should be used to connect SK1 to the PC. The computers port settings are as follows: 19 200 Baud 1 Start bit 1 Stop bit No parity bits The Serial Interface allows for the following operations: Read Integrator: The device transmits the current integrator status to the controller, after the current measurement cycle has been completed (8 mains periods maximum).
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PM9103AP Reset Integrator: status. The integrator is reset without transmitting the integrator
Read/Reset Integrator: The device transmits the integrator status and resets the integrator after the current measurement cycle has been completed. In a typical application, the system controller monitors the status of the on-chip integrator using the "Read" command. If after a "Read" command, the integrator value is sufficiently high, a "Read/Reset" command from the controller causes the integrated circuit to complete the existing measurement cycle, transmit the 16 most significant bits of the 22 bit integrator via the Serial Output, to the controller and restart the integrator. The most significant bit of the 16 bits, indicates the direction of energy consumption measured (0 = Positive, 1 = Negative). Refer to the SA9103C, SA9103E or SA9603C datasheets for the serial interface command protocols. 6. Circuit Description The Application Circuit (figure 2) shows the components required for the serial interface 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 of 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 SA9103 / SA9603C at maximum line current. Values for RSH of less than 200 should be avoided. R1 = R2 = IL/16ARMS * RSH/2. Where IL = Line current = Shunt resistor/terminating 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 defines all on-chip bias and reference currents. With R7 = 24k, optimum conditions are set. sames
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PM9103AP 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. 7. Demonstration Software Software which runs under Windows 3.1 is provided with each evaluation module. See README.TXT on the diskette supplied for the installation instructions.
Figure 1: Connection Diagram
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PM9103AP APPLICATION CIRCUIT Figure 2: Application using a Shunt Resistor for Current Sensing, having a PC (Personal Computer) Interface.
Note:
The Serial Interface having a RS232 protocol, has been designed to operate directly with a PC (Personal Computer). sames
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PM9103AP Parts List For Application Circuit: Figure 2 Item Symbol Description
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 IC-1 IC-2 IC-3 D1 D2 D3 ZD1 ZD2 XTAL R1 R2 R3A R3B R4 R5 R6 R7 R8 R9 R10 R12 R13 R14 R15 C1 C2 C3 C4 C9 C10 C11 C12 C13 C14 C15 RSH SA9103CP/SA9103EP/SA9603C Opto Coupler 4N35 Opto Coupler 4N35 Diode, Silicon, 1N4148 Diode, Silicon, 1N4148 Diode, Silicon, 1N4148 Diode, Zener, 2.4V, 200mW Diode, Zener, 2.4V, 200mW Crystal, 3.5795MHz Resistor, 1.6k, 1%, metal Resistor, 1.6k, 1%, metal Resistor, 1%, metal Resistor, 1%, metal Resistor, 1M, 1/4W Resistor, 470, 2W, 5%, carbon Resistor, 24k, 1/4W, metal Resistor, 24k, 1/4W, metal Resistor, 680, 1/4W, 5% Resistor, 680, 1/4W, 5% Resistor, 680, 1/4W, 5% Resistor, 120, 1/4W, 5% Resistor, 120k, 1/4W, 5% Resistor, 3.9k, 1/4W, 5% Resistor, 120, 1/4W, 5% Capacitor, 560pF Capacitor, 560pF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 100nF Capacitor, 100nF Capacitor, polyester Capacitor, 100nF Capacitor, 100F, 16V Capacitor, 100F, 16V Capacitor, 820nF, 16V Shunt Resistor, 80A, 50mV (625)
Detail
DIP-20 DIP-6 DIP-6
Colour burst TV Note 1 Note 1 Note 2 Note 2
Note 2
Note 1
Note 1: Resistor (R1 and R2) values are dependant upon the selected value of RSH. See paragraph 6 (Circuit Description) when selecting the value for RSH. Note 2: See the table below, detailing the component values for the selected voltage standard.
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PM9103AP
Item 12 13 31
Symbol R3A R3B C11
Description PM9103APA PM9103APE 115V 230V 120k 200k 82k 180k 1F 0.47F
Detail
ORDERING INFORMATION Part Number PM9103APA PM9103APE Description 115V, 80A Module 230V, 80A Module
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PM9103AP
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
Tel: Fax:
012 333-6021 012 333-8071
Tel: Fax:
Int +27 12 333-6021 Int +27 12 333-8071
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