PM96045AP SAMES | Alldatasheet
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THREE PHASE POWER/ENERGY METERING MODULE FOR SPI BUS AND PULSE OUTPUT DEVICES sames PM9604/5AP SA9604/5 APPLICATION NOTE 7205 PDS038-SA9604/5-001 REV.B 18-06-98
FEATURES
■ Module used for both SA9604A and SA9605A evaluation ■ Meets the accuracy requirements for Class 1 AC Watt hour meters ■ Operates over a wide temperature range ■ Uses current transformers for current sensing ■ Protection against ESD ■ Unused connection pads allows the module to be customised
DESCRIPTION
This innovative power/energy module allows evaluation of both the SA9604A and SA9605A, members of the SAMES three phase metering I.C. family. It is advised that the relevant data sheet for the device under evaluation be read in conjunction with this Application Note. The output of this innovative universal three phase power/energy metering circuit is ideally suited for energy calculations in applications using a µ-controller (SA9604A and SA9605A) or mechanical counter (SA9605A). On the left hand side of the board, next to the 25-way D-type connector, the array of unused solder pads allow the user to customise the module. This section of the board may be used to access the opto-coupler isolated output signals. Such components as counters and LEDs may be added to this area to allow the user evaluation of a design using the SA9604A or SA9605A. CARE MUST BE TAKEN WHEN CONNECTING ADDITIONAL COMPONENTS TO THE BOARD AS DANGEROUS VOLTAGE LEVELS EXIST IN SOME AREAS. BLOCK DIAGRAM SA9604/ 5A- 2.5VCONDI TI ONI NG NEUTRAL PHASE 1 PHASE 2 PHASE 3 SIGNA LLINE 2 LINE 3 LINE 1 + 2.5V O P T O C O U P L E R O P T O C O U P L E R 25-WAY D-TYPE - FEMALE DI R (SA 9604A) SK2 FOUT 1 FOUT 2 FO UT X (SA9605A) SK3
Supply Voltage (Note 1) V AC 540 V Storage Temperature T STG -25 +125 °C Operating Temperature (Note2) TO -10 +70 °C Note 1: Voltages are specified with reference to Neutral. Note 2: The SA9604A and SA9605A integrated circuits are specified to operate over the temperature range -10°C to +70°C. 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 operational sections of this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Over the temperature range -10°C to +70°C, unless otherwise specified. Power consumption figures are applicable to the PM9604/5APE only.) Parameter Symbol Min Typ Max Unit Condition Supply voltage (3 phase) V AC 180 230 265 V PM9604/5APE (Continuous) 90 115 138 V PM9604/5APA Output Refer to applicable IC data sheet Power consumption 1 2.4 W V DD = 5V Note 1: Power consumption specifications exclude power consumed by the current sensor. ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Min Max Unit
MAINS Voltage supply connection to Phase 1 Voltage supply connection to Phase 2 Voltage supply connection to Phase 3 Voltage supply connection to Neutral Live (common) SK2 P1 Supply (+ve) to opto-couplers 25-Way female P7 Input SA9604A - SCK (D-type) P8 Input SA9604A - DI P9 Input SA9604A - CS P12 Output SA9604A - DO P18, 20 - 25 Common emitters and cathodes of opto-couplers SK3 1. Supply (+ve) to opto-couplers 4-Way male 2. Output SA9605A - FOUT1 / FOUT2 (selectable) 3. Output SA9605A - DIR 4. Common emitters and cathodes of opto-couplers SELECTION PINS Jumper Description JP1 CT1 selection JP2 CT2 selection JP3 CT3 selection JP4 SA9604A - SCK signal connection SA9605A - FOUT1 on FOUT2 selection JP5 SA9604A - DI signal connection SA9605A - PGM1 level selection JP6 SA9604A - CS signal connection SA9605A - PGM0 level selection JP7 Resistor selection for on-chip bias and reference current
- Power Calculation In the Application Circuit (Figure 2), the output current from the current sensor will be between 0 and 16µA RMS . The current input stage saturates at input currents greater than18µARMS . The mains voltage (mains voltage + 15% -20%) is used for the power calculation, together with the current information from the current sensor (current transformers). For rated conditions, the signals into the current and voltage sensor inputs are set as follows: Current sensor input currents: 16µA RMS Voltage sensor input currents: 14µARMS 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. 3. Power Consumption The overall power consumption rating for this power metering application (Figure 2), is under 2.4W, excluding the current sensors. 4. Isolation The reference for the unit is connected to neutral. 5. Isolated Input/Output Interface The isolated interface is provided to allow the user to access the registers of the SA9604A and the output signals of the SA9605A. Two connector types are available on the PM9604/5AP module to access the outputs of the two devices: SK2 - a 25-way D-type connector (female) for the SA9604A SK3 - a 4-pin connector for the SA9605A. Only one of the output interfaces must be used at any one time to avoid conflict of signal levels on the opto-couplers.
- Jumper Configurations The jumper configufations required for the two devices types are shown below: JUMPER POSITION SA9604A SA9605A NOTES JP1 1 - 2 Insert Insert JP2 1 - 2 Insert Insert Note 1 JP3 1 - 2 Insert Insert JP4 1 - 2 Remove Insert (FOUT1) 2 - 3 Remove Insert (FOUT2) Note 2 3 - 4 Insert (SCK) Remove JP5 1 - 2 Remove Insert (PGM1=1) Note 3 2 - 3 Insert (CS) Remove (PGM1=0) JP6 1 - 2 Remove Insert (PGM0=1) Note 3 2 - 3 Insert (DI) Remove (PGM0=0) JP7 1 - 2 Remove Insert Note 1: The removal of the link on the current sensor input must only be performed during calibration. Note 2: Only one of the two output pulse signals on the SA9605A may be selected at any one time using this module. In a users application both of these signals may be used. Note 3: The SA9605A I.C. has on-board pull-down resistors, pull-up connection to VDD is, therefore, the only connection which must be catered for.
- Circuit Description The module is supplied from an on-board DC supply derived from the incoming three phases. 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: Terminated current sensors (current transformers) are connected to the current sensor inputs of the devices through current setting resistors (R8...R13). The resistor values should be selected for an input current of 16µA RMS into the integrated circuit current sensor inputs at the rated line current. The values of these resistors are calculated as follows: Phase 1: R 8 = R9 = (IL1/16µARMS ) x R17/2 Phase 2: R 10 = R11= (IL2/16µARMS ) x R18/2 Phase 3: R 12 = R13 = (IL3/16µARMS ) x R19/2 Where I LX = Secondary CT current at rated conditions. R 17, R18 and R19 = Termination resistors of the three current transformers. R 1A, R1B, R4 and R14 set the current for the phase 1 voltage sense input. R2A + R2B,R5 and R15 set the current Phase 2 and R3A + R3B, R6 and R16 set the current for Phase 3. The values should be selected so that the input current into the voltage sense input (virtual ground) is set to 14µA RMS at nominal line voltage. Capacitors C1, C2 and C3 are for decoupling and phase compensation. Resistors R7A + R7B and trimpot T7 defines all on-chip bias currents. R7 is made up of two resistors which can be connected in parallel using JP7 to allow convertion of the module between the SA9604A and SA9605A devices. The SA9604A uses a reference current of 25µA ± 10% and the SA9605A reference current is 50µA ± 10%. Inserting the jumper will connect R 7A and R7B in parallel, thereby doubling the reference current to an appropriate level. T7 may be varied for calibration purposes. 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.
Figure 1: Module layout 8. Demonstration Software Software to demonstrate the capabilities of the SA9604A is provided with the module. This software is supplied on a 3½" disk and will operate under Windows 95 or Windows 3.1 environment. R27 CT2 IC 1 PI N13R12 R35 P14 R29 SK3 PI N9 PI N12 R34R33 IC 5 PI N7 PI N8 IC 2 R28 JP4 SA9604 FO UT Se le c t SK2 R18 R19 JP3 R13 R10 R16 R11 JP2 PH2 Bal CT3 CT PH3 CT PH2 C11 R7A R32 C8R30 R31 D1D2C7 R24 IC 4 R7BJP7 JP5XTAL R25 R26 JP6 Gain Adj IC 3 R23 C10 D3D4 PM9604/5AP SAMES R20 CT1 T5 T6 R14R9 R8R15 Bal ance PH3 JP1 R3B R2B C2 R1A R17 R1B MAI NS CT PH1 R3A M2 M3 R2A R21 R22 Note: The pins of the voltage supply connector, called 'MAINS' have been incorrectly marked. The order of the pins should read: N (Neutral), Ph 3, Ph 2, Ph 1. The printed circuit board markings of the Ph 1 and Ph 3 pins have been swopped.
Figure 2: Application Schematic dr - 01320
Parts List for Application Circuit: Figure 2 Item Symbol Description Detail
1 IC-1 SA9604AP / SA9605AP DIP-20
2 XTAL Crystal, 3.5795 MHz TV Crystal
3 R1A Resistor, 1%, ¼W, Metal Note 4
4 R1B Resistor, 1%, ¼W, Metal Note 4
5 R2A Resistor, 1%, ¼W, Metal Note 4
6 R2B Resistor, 1%, ¼W, Metal Note 4
7 R3A Resistor, 1%, ¼W, Metal Note 4
8 R3B Resistor, 1%, ¼W, Metal Note 4
9 R4 Resistor, 24k, 1%, ¼W, Metal
10 R5 Resistor, 22k, 1%, ¼W, Metal
11 R6 Resistor, 22k, 1%, ¼W, Metal
12 R7A Resistor, 44k, 1%, ¼W, Metal
13 R7B Resistor, 44k, 1%, ¼W, Metal
14 R8 Resistor, 2.7k, 1%, ¼W, Metal Note 1 15 R9 Resistor, 2.7k, 1%, ¼W, Metal Note 1 16 R10 Resistor, 2.7k, 1%, ¼W, Metal Note 1 17 R11 Resistor, 2.7k, 1%, ¼W, Metal Note 1 18 R12 Resistor, 2.7k, 1%, ¼W, Metal Note 1 19 R13 Resistor, 2.7k, 1%, ¼W, Metal Note 1
20 R14 Resistor, 1M, 1%, ¼W, Metal
21 R15 Resistor, 1M, 1%, ¼W, Metal
22 R16 Resistor, 1M, 1%, ¼W, Metal
23 R17 Resistor, 2.7 Ω , 1%, ¼W, Metal Note 1 24 R18 Resistor, 2.7 Ω , 1%, ¼W, Metal Note 1 25 R19 Resistor, 2.7 Ω , 1%, ¼W, Metal Note 1 27 T5 Potentiometer, 4.7k Multi turn. Note 5 28 T6 Potentiometer, 4.7k Multi turn. Note 5 29 T7 Potentiometer, 10k Multi turn. Note 5
30 C1 Capacitor, electrolytic, 1µF, 16V Note 2
31 C2 Capacitor, electrolytic, 1µF, 16V Note 2
32 C3 Capacitor, electrolytic, 1µF, 16V Note 2
33 R20 Resistor, 470 Ω , 2W
34 R21 Resistor, 470 Ω , 2W
35 R22 Resistor, 470 Ω , 2W
36 R23 Resistor, 680 Ω , 1% ¼W, Metal
37 R24 Resistor, 680 Ω , 1% ¼W, Metal
38 R25 Resistor, 2.4k, 1% ¼W, Metal 39 R26 Resistor, 2.4k, 1% ¼W, Metal 40 R27 Resistor, 2.4k, 1% ¼W, Metal
41 R28 Resistor, 820R, 1% ¼W, Metal
42 R29 Resistor, 820R, 1% ¼W, Metal
43 R31 Resistor, 47k, 1% ¼W, Metal
44 R32 Resistor, 47k, 1% ¼W, Metal
44 R33 Resistor, 680R, 1% ¼W, Metal
45 R34 Resistor, 680R, 1% ¼W, Metal
46 R35 Resistor, 680R, 1% ¼W, Metal
47 C4 Capacitor Note 4
48 C5 Capacitor Note 4
49 C6 Capacitor Note 4
50 C7 Capacitor, 200µF, 35V
51 C8 Capacitor, 200µF, 35V
52 C9 Capacitor, Tantulum, 10µF
53 C10 Capacitor, Tantulum, 10µF
54 C11 Capacitor, Ceramic 820nF Note 3
55 XTAL Crystal, 3.5795MHz TV Crystal
56 D1 Diode, 1N4002
57 D2 Diode, 1N4002
58 D3 Diode, 1N4002
59 D4 Diode, 1N4002
60 D5 Diode, 1N4002
61 D6 Diode, 1N4002
62 Z1 Diode, Zener, 22V
63 IC3 TL 431C, Voltage Reference
64 IC4 TL 431C, Voltage Reference
65 IC2 Quad Opto Coupler, ILQ73
66 IC5 Opto Coupler, 4N35
Parts List for Application Circuit: Figure 2 (Continued) Item Symbol Description Detail Note 1: Resistor (R8, R9, R10, R11, R12 and R13) values are dependant upon the selected values of the current transformer termination resistors R17, R18 and R19. Note 2: Capacitor values may be selected to compensate for phase errors caused by the current transformers Note 3: Capacitor (C11) 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. Note 5: Trimpots required for calibration.
ORDERING INFORMATION
PM9604/5APA 3 X 115V, 3 X 80A Module PM9604/5APE 3 X 230V, 3 X 80A Module Item Symbol DetailPM9604/5APE PM9604/5APA 230V 115V
3 R1A 200k Ω 120kΩ
4 R1B 180k Ω 82kΩ
5 R2A 200k Ω 120kΩ
6 R2B 180k Ω 82kΩ
7 R3A 200k Ω 120kΩ
8 R3B 180k Ω 82kΩ
47 C4 470nF 1µF
48 C5 470nF 1µF
49 C6 470nF 1µF
NOTE:
Disclaimer: The information contained in this document is confidential and proprietary to South African Micro- Electronic 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 our 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: 012 333-6021 Tel: Int +27 12 333-6021 Fax: 012 333-8071 Fax: Int +27 12 333-8071