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IL19006 THREE PHASE POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES
* Output frequency represents the absolute sum of energy on all three phases * Performs one, two or three phase power and energy measurement * Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters * Operates over a wide temperature range FUNCTIONAL DESCRIPTION: The IL19006 Three Phase Power/Energy metering integrated circuit generates a pulse rate output, the frequency of which is proportional to the absolute power consumption. The IL19006 performs the calculations of active power. The method of calculation takes the power factor into account. Energy consumption is determined by the power measurement being integrated over time. The output of this universal three phase power/energy metering integrated circuit, is ideally suited for applications such as residential and industrial energy metering and control. The IL19006 Three Phase Power/Energy metering integrated circuit is a CMOS mixed signal Analog/Digital integrated circuit, which performs three phase power/energy calculations over a range of 1000:1, to an overall accuracy of better than Class 1. The integrated circuit includes all the required functions for 3-phase power and energy measurement such as oversampling A/D converters for the voltage and current sense inputs, power calculation and energy integration. Internal offsets are eliminated through the use of cancellation procedures. The IL19006 generates pulses, the frequency of which is proportional to the power consumption. Two frequency outputs (FOUT1 and FOUT2) are available. The pulse rate follows the instantaneous power measured. * Current transformers for sensing * Excellent long term stability * Easily adaptable to different signal levels * Precision voltage reference onchip * Pin selectable pulse rates * Support tamper detection
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ILA19006
BLOCK DIAGRAM
FOUT1 FOUT2 DIR OSC1 OSC2
VDD VSS
PGM0 PGM1
INTEG. & AVERAGE
POWER TO PULSE RATE
ANALOG SIGNAL PROCESSING
VREF
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VREF
IVN1 IVN2
IVN3
IIP1 IIN1
IIP2 IIN2 IIP3 IIN3
GND
TIMING & CONTROL
OSC
ILA19006
ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Min Max Unit Supply Voltage VDD -VSS -0.3 6.0 V Current on any Pin IPIN -150 +150 mA Storage Temperature TSTG -40 +125 C Operating Temperature TO -40 +85 C Current at any pin Ip -100 100 mA * 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. ELECTRICAL CHARACTERISTICS
(VDD=2.5V, VSS=-2.5V, over the temperature range -10C to +70C, unless otherwise specified.)
Parameter Symbol Min Operating Temperature TO -25 Ranges Supply Voltage VDD-VSS 4.5 Supply Current Nonlinearity of Power Calculation Current Sensor Inputs Input Current Range Voltage Sensor Inputs Input Current Range Pins FOUT1, FOUT2, DIR Output Low Voltage Output High Voltage Pulse Rate: FOUT1 FOUT2 Oscillator Pin VREF Ref. Current Ref. Voltage -IR VR 45 1.1 IDD -0.3
Typ Maxf Uni +85 0C 5.5 V
Condition
15 mA +0.3 % 1%-100% of rated power +25 +25 A Peak value A Peak value
(Differential) III -25 (Asymmetric) IIV -25
VOL VOH fp
VDD-1 10
VSS+1 V IOL=5 mA V IOH=-2 mA
1160 Hz Specified linearity 3000 Hz Min and max limits User selectable Recommended crystal: TV colour burst crystal, f=3.5795 MHz 50 55 1.3 With R = 24 k A connected to VSS V Referred to VSS
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ILA19006
PIN DESCRIPTION Pin Designation 16 GND 6 VDD 14 VSS 17 IVN1 20 IVN2 3 IVN3 19 IIN1 18 IIP1 2 IIN2 1 IIP2 5 IIN3 . 4 IIP3 10 OSC1 11 OSC2 7 FOUT1 8 FOUT2 . 9 DIR 12 PGM0 13 PGM1 15 VREF Description Ground Positive Supply Voltage Negative Supply Voltage Analog Input for Voltage: Phase 1 Analog Input for Voltage: Phase 2 Analog Input for Voltage: Phase 3 Inputs for current sensor-: Phase 1 Inputs for current sensor : Phase 2 Inputs for current sensor: Phase 3 Connections for crystal or ceramic resonator (OSC1=Input; OSC2=Output) Pulse rate outputs Direction indicator FOUT2 Frequency select pins Connection for current setting resistor
Note: arrangement of pins according to analog SA9605A (Sames) FUNCTIONAL DESCRIPTION The IL19006 is a CMOS mixed signal Analog/Digital integrated circuit, which performs three phase power/energy calculations over a range of 1000:1, to an overall accuracy of better than Class 1. The IL19006 in both DIP-20 and SOIC-20 package options is functionally similar to the SA9105E and SA9105F with the advantage of no external loop capacitors. The integrated circuit includes all the required functions for 3-phase power and energy measurement such as oversampling A/D converters for the voltage and current sense inputs, power calculation and energy integration. Internal offsets are eliminated through the use of cancellation procedures. The IL19006 generates pulses, the frequency of which is proportional to the power consumption. Two frequency outputs (FOUT1 and FOUT2) are available. The pulse rate follows the instantaneous power measured. 1. Power Calculation In the Application Circuit (Figure 1), the mains voltages from Line 1, Line 2 and Line 3, are converted to currents and applied to the voltage sense inputs IVN1, IVN2 and
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ILA19006
IVN3. The current levels on the voltage sense inputs are derived from the mains voltage (3 x 230 VAC) being divided down through voltage dividers to 14V. The resulting input currents into the A/D converters are 14A through the resistors R15, R16 and R17. For the current sense inputs the voltage drop across the current transformers terminating resistors are converted to currents of 16A for rated conditions, by means of resistors R8, R9 (Phase 1); R10, R11 (Phase 2); and R12, R13 (Phase 3). The signals providing the current information are applied to the current sensor inputs: IIN1, IIP1; IIN2, IIP2; and IIN3, IIP3. In this configuration, with the mains voltage of 3 x 230 V and rated currents of 80A, the output frequency of the IL19006 energy metering integrated circuit at FOUT1 is 1.16kHz. In this case 1 pulse will correspond to an energy consumption of 3 x 18.4 kW/1160Hz = 47.6 Ws. The output frequency at FOUT1 and FOUT2 represents the absolute sum of the energy measured on all three phases, regardless of the direction of energy flow through the current sensors. This measurement method will assist meter manufacturers to circumvent meter tampering by reversal of the phases. 2. Analog Input Configuration The current and voltage sensor inputs are illustrated below. These inputs are protected against electrostatic discharge through clamping diodes, in conjunction with the amplifiers input configuration. The feedback loops from the outputs of the amplifiers AI and AV generate virtual shorts on the signal inputs. Exact duplications of the input currents are generated for the analog processing circuitry.
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ILA19006
3. Electrostatic Discharge (ESD) Protection The IL19006 integrated circuit's inputs/outputs are protected against ESD. 4. Power Consumption The overall power consumption rating of the IL19006 integrated circuit is less than 75mW with a 5V supply. 5. Pulse Output Signals Waveforms displaying the DIR and FOUT1 signal information for each of the three phases are shown below.
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ILA19006
8.94 s DIR FOUT1 71.55 s 8.94 s
PHASE 1, POSITIVE
DIR FOUT1 PHASE 1, NEGATIVE
DIR PHASE 2, POSITIVE FOUT1
DIR FOUT1 PHASE 2, NEGATIVE
DIR FOUT1 PHASE 3, POSITIVE
DIR FOUT1 PHASE 3, NEGATIVE
These waveforms demonstrate how to establish the direction of energy flow as well as the phase from which the energy is measured. The direction of energy indicated on pin DIR is HIGH for POSITIVE energy flow and LOW for NEGATIVE energy flow, for the entire LOW period of the FOUT1 pulse. The phase to which the direction indication on the DIR pin refers can be ascertained by counting the number of falling edges on the DIR pin prior to the falling edge of the FOUT1 pulse. The supervision of the DIR pin can be accomplished with a Controller. Although FOUT1 has a fixed frequency output, the table below shows the various frequencies selectable for rated condition on FOUT2. User Selectable Output Frequency PGM1 PGM0 FOUT2 (Hz) 0 0 5.11 0 1 3.83 1 0 2.55 1 1 N/A The frequencies shown in the above table were chosen to allow a 4-3-2 scaling ratio for
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ILA19006
rated conditions. This facility provides ease of interface with applications which use the same post divider with mechanical counter or unchanged microcontroller software for different current rated kWh meters. For example, a meter manufacturer may wish to build meters for 3 system configurations with rated current loading of 80ARMS , 60ARMS and 40ARMS. The rated line voltage is 230VRMS. FOUT1 Frequency Consider the case where FOUT1 is the output of the energy counting block. For each of the three rated conditions, the input current sensing resistors are chosen to ensure that 16ARMS flows into the current sensing pins. Case 1 IL = 80ARMS 1 pulse on FOUT1 = (80*230*3)/1160 = 47.6Ws Case 2 IL = 60ARMS 1 pulse on FOUT1 = (60*230*3)/1160 = 35.7Ws Case 3 IL = 40ARMS 1 pulse on FOUT1 = (40*230*3)/1160 = 23.8Ws The amount of energy represented by one pulse for each of the three cases is different. In addition to changing the current sensing resistor network, the energy counting block must also be altered. FOUT2 Frequency Now consider the advantage of the user selectable frequency available on FOUT2. Again the input current sensing resistors must be chosen to ensure that 16A RMS flows into the current sensing pins. Case 1 IL = 80ARMS, PGM1 = 0 PGM0 = 0 1 pulse on FOUT2 = (80*230*3)/5.11 = 10.8kWs Case 2 IL = 60ARMS, PGM1 = 0 PGM0 = 1 1 pulse on FOUT2 = (60*230*3)/3.83 = 10.8kWs PGM1 = 1 PGM0 = 0 Case 3 IL = 40ARMS, 1 pulse on FOUT2 = (40*230*3)/2.55 = 10.8kWs The only changes which now have to be implemented to interface the device to different rated systems are: change the current sense resistors; and select the required PGM0 and PGM1. No change to the post divider or micro-controller software is required if the FOUT2 pin is used as described. TYPICAL APPLICATION In the Application Circuit (Figure 1), the components required for a three phase power metering application are shown. Terminated current sensors (current transformers) are connected to the current sensor inputs of the IL19006 through current setting resistors (R8..R13).
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ILA19006
The resistor values for standard operation are selected for an input current of 16A into the IL19006, at the rated line current. The values of these resistors are calculated as follows: Phase 1: R8= R9= (IL1 /16A) * R18/2 Phase 2: R10 = R11 = (IL2 /16A) * R19/2 Phase 3: R12 = R13 = (IL3 /16A) * R20/2 Where ILX = Secondary CT current at rated conditions. R18, R19 and R20 = Current transformer termination resistors for the three phases. 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, R6+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) are set to 14A for rated 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 = 24kW, optimum conditions are set. R14+P14 may be varied within 10% for calibration purposes. Any changes to R 14 + P 14 will affect the output quadratically (i.e: R = +5%, f = +10%). The formula for calculating the Output Frequency (f) is given below: ( I I ) + ( I I 2 IV 2 ) + ( I I 3 IV 3 ) FOSC f = 11.16 FOUTX I1 V 1 2 3.5795 3 I R Where FOUTX = Nominal rated frequency (1160Hz) FOSC = Oscillator frequency (2MHz ...... 4MHz) II1, II2, II3 = Input currents for current inputs (16A at rated) IV1, IV2, IV3 = Input currents for voltage inputs (14A at rated) IR = Reference current (typically 50A) XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator frequency is divided down to 1.78975 MHz on-chip, to supply the digital circuitry and the A/D converters.
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ILA19006
Figure 1: Application Circuit for Three Phase Power/Energy Measurement.
MAINS VOLTAGES LINE 1 LINE 2 LINE 3 R1 R2 R3 R1A R2A R3A
R11 VI2P VI2N VI3P VI3N R20 R19 C3 R10
1 2
20
R16 R8 R9 R15
C2 R18 VI1P C1 R4 R5 P5 5V P14 0V R7 VI1N
R17 3 R13 R12
4 5 6 7 8
ILA9605A DIP-20 IC-1
19 18 17 16 15 14 13 12 11
R14 PGM1 PGM0
FOUT1 FOUT2 DIR P6 R6
9 10
5V 0V
XTAL
0V
R21 C14
C13
C12
0V
0V
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ILA19006
Parts List for Application Circuit: Figure 1
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 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 C12 C13 C14 Description Integrated IL19006 Crystal, 3.5795 MHz Resistor, 200k, 1%, 1/4W Resistor, 180k, 1%, 1/4W Resistor, 200k, 1%, 1/4W Resistor, 200k, 1%, 1/4W Resistor, 200k, 1% , 1/4W Resistor, 180k, 1%, 1/4W Resistor, 24k, 1%, 1/4W Resistor, 22k, 1%, 1/4W Resistor, 22k, 1%, 1/4W Resistor, 820W, 1%, 1/4W Resistor Resistor Resistor Resistor Resistor Resistor Resistor, 22k, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor Resistor Resistor Resistor, 820W, 1%, 1/4W Potentiometer, 4.7k Potentiometer, 4.7k Potentiometer, 4.7k Capacitor, electrolytic, 1F, 6V Capacitor, electrolytic, 1F, 6V Capacitor, electrolytic, 1F, 6V Capacitor, 820nF Capacitor, 100nF Capacitor, 100nF Detail DIP-20, SOIC-20 Colour burst TV
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 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 (C12) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as possible.
Korzhenevskogo 12, Minsk, 220064, Republic of Belarus Fax: +375 (17) 278 28 22, Phone: +375 (17) 278 07 11, 212 24 70, 212 24 61, 212 69 16 E-mail: office@bms.by URL: www.bms.by
ILA19006
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