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ILA19002 SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES * Performs bidirectional power and energy measurement * Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters * Protected against ESD FUNCTIONAL DESCRIPTION: The ILA19002 Single Phase Bidirectional Power/Energy metering integrated circuit generates a pulse rate output, the frequency of which is proportional to the power consumption. The ILA19002 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. This universal single phase bidirectional power/energy metering integrated circuit is ideally suited for energy calculation in applications such as residential municipal metering and factory energy metering and control. The ILA19002 Single Phase Bidirectional Power/Energy metering integrated circuit is a CMOS mixed signal Analog/Digital integrated circuit, which performs 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 1-phase power and energy measurement such as two 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 ILA19002 Single Phase Bidirectional Power/Energy metering integrated circuit generates pulses, the frequency of which is proportional to the power consumption. The pulse rate follows the instantaneous power consumption measured. Direction information is also provided. A voltage zero crossover signal, relevant to the positive going half cycle, is available on pin FMO. This signal can be used to synchronise circuit breaker switching. IC is available in both 14 and 20 pin dual-in-plastic (DIP-14/DIP-20), as well as 20 pin small outline (SOIC-20) package types. * Total power consumption rating below 25 mW * Adaptable to different types of current sensors * Operates over a wide temperature range * Precision voltage reference on-chip
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ILA19002
BLOCK DIAGRAM
VDD VSS
IIP
IIN
ANALOG SIGNAL PROCESSING
POWER INTEGRATOR
POWER TO FREQUENCY
FOUT DIR
IVP
VOLTAGE REF.
GND FMO
OSC
TIMING
VREF
OSC1
OSC2
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 * 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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ILA19002
ELECTRICAL CHARACTERISTICS
(VDD=2.5V, VSS=-2.5V, over the temperature range -10C to +70C, unless otherwise specified.)
Parameter Operating Temperature Ranges Supply Voltage: Positive
Symbol Min TO -25 VDD 2.25 -2.75
Typ
Maxf +85 2.75
Unit Condition 0 C V
Supply Voltage: Negative VSS Supply Current: Positive Supply Current: Negative Current Sensor Inputs Input Current Range Voltage Sensor Inputs Input Current Range Pins FOUT, FOUT2 Output Low Voltage Output High Voltage Pulse Rate FOUT Pulse Width tp Pin VREF Ref. Current Ref. Voltage Oscillator -IR VR
-2.25 V 6 6 +25 +25 VSS+1 mA mA A A Peak value Peak value
IDD 5 ISS 5 (Differential) III -25 (Asymmetrical ) IIV VOL VOH fp tPP tPN 45 1.1 -25
VDD-1 0 0 71:55 143.1 50 55 1.3 1160 3000
V V Hz Hz s s A V
IOL=5 mA IOH=-2 mA Specified linearity Min and max limits Positive Energy Flow Negative Energy Flow With R = 24 k connected to VSS Referred to VSS
Recommended crystal: TV colour burst crystal, f=3.5795 MHz
Korzhenevskogo 12, Minsk, 220108, Republic of Belarus Fax: +375 (17) 278 28 22, 3 Phone: +375 (17) 278 07 11, 212 24 70, 212 24 61, 212 69 16 E-mail: office@bms.by URL: www.bms.by
ILA19002
PIN DESCRIPTION 14 Pin 20 Pin Designation 14 20 GND 5 8 VDD 10 14 VSS 13 19 IVP 1 1 IIN 2 2 IIP 3 3 VREF 4 7 TEST 7 6 8 9 11 11 10 12 13 15 4 5 6 9 16 17 18 OSC1 OSC2 FOUT DIR FMO TP4 TP5 TP6 TP9 TP12 TP16 TP17 TP18 Description Ground Positive Supply Voltage Negative Supply Voltage Analog Input for Voltage Inputs for current sensor Connection for current setting resistor Test Pin. Tie to VSS for protection against HV transients and noise Connections for crystal or ceramic resonator (OSC1=Input; OSC2=Output) Pulse rate output Direction indication output Rising edge of mains frequency Test pins (Leave unconnected)
12
Note: arrangement of pins according to analog SA9602H (Sames)
Korzhenevskogo 12, Minsk, 220108, Republic of Belarus Fax: +375 (17) 278 28 22, 4 Phone: +375 (17) 278 07 11, 212 24 70, 212 24 61, 212 69 16 E-mail: office@bms.by URL: www.bms.by
ILA19002
FUNCTIONAL DESCRIPTION The ILA19002 is a CMOS mixed signal Analog/Digital integrated circuit, which performs power/energy calculations across a power range of 1000:1, to an overall accurancy of better than Class 1. The integrated circuit includes all the required functions for 1-phase power and energy measurement such as two 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 ILA19002 generates pulses, the frequency of which is proportional to the power consumption. The pulse rate follows the instantaneous power consumption measured. Direction information is also provided. A voltage zero crossover signal, relevant to the positive going half cycle, is available on pin FMO. This signal can be used to synchronise circuit breaker switching. 1. Power Calculation In the Application Circuit (Figure 1), the voltage drop across the shunt will be between 0 and 16mV RMS (0 to 80A through a shunt resistor of 200). This voltage is converted to a current of between 0 and 16A RMS , by means of resistors R 1 and R 2 . The current sense input saturates at an input current of 25A peak. For the voltage sensor input, the mains voltage (230VAC) is divided down through a divider to 14V. The current into the A/D converter input is set at 14A RMS at nominal mains voltage, via resistor R4 (1M). In this configuration, with a mains voltage of 230V and a current of 80A, the output frequency of the ILA19002 power meter chip at FOUT is 1.16kHz. In this case 1 pulse will correspond to an energy consumption of 18.4kW/1160Hz = 15.9Ws. 2. Analog Input Configuration The input circuitry of the current and voltage sensor inputs are illustrated below. These inputs are protected against electrostatic discharge through clamping diodes. The feedback loops from the outputs of the amplifiers A I and A V generate virtual shorts on the signal inputs. Exact duplications of the input currents are generated for the analog signal processing circuitry. 3. Electrostatic Discharge (ESD) Protection The ILA19002 integrated circuit's inputs/outputs are protected against ESD 4. Power Consumption The power consumption rating of the ILA19002 integrated circuit is less than 25mW. 5. Pulse Output Signals The diagram below shows the behavior of the instantaneous pulse output, FOUT, with respect to the power consumption.
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ILA19002
Pulse Output Signals The diagram below shows the behavior of the instantaneous pulse output, FOUT, with respect to the power consumption.
VMAINS t
POWER V
t FOUT t tP
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ILA19002
The diagram below shows the behavior of the direction indicator, DIR, when energy reversal takes place. The timing period for the DIR signal to change state, tDIR, will be defined by the time it takes for the integrator to count down from its value at the time of energy reversal. This is determined by the energy consumption rate.
V
s
t
I
s s t
DIR
tDIR
The square wave signal on FMO indicates the polarity of the mains voltage.
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ILA19002
V
t
FMO
tMAINS
t
Due to comparator offset, the FMO low to high transition can be occur within a range as shown above. The time between successive low to high transitions will be equal to the mains voltage period. TYPICAL APPLICATIONS In the Application Circuits (Figures 1 and 2), the components required for power metering applications, are shown. In Figure 1 a shunt resistor is used for current sensing. In this application, the circuitry requires a +2.5V, 0V, -2.5V DC supply. In the case of Figure 2, when using a current transformer for current sensing, a +5V, 0V DC supply is sufficient. The most important external components for the ILA19002 integrated circuit are: 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 ILA19002 at maximum line current. Values for RSH of less than 200 should be avoided. R 1 = R 2 = (I L /16A)RMS * RSH /2 Where I L = Line current RSH = Shunt resistor/termination resistor 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. R7 may be varied within 10% for calibration purposes. Any change to R7 will affect the output quadratically (i.e.: R7 = +5%, fP = +10%). The formula for calculating the output frequency is given below: I I FOSC f = 11.16 FOUTX I 2V 3.58MHz IR Where FOUTX = Normal rated frequency (1160Hz) FOSC = Oscillator frequency (2MHz ...... 4MHz)
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ILA19002
II = Input current for current input (16ARMS at rated) IV = Input current for voltage input (14ARMS 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 1.7897 MHz on-chip, to supply the digital circuitry and the A/D converters. Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
LOAD
R6 R S H
R3
R2
R1
1 2 3 4 5 6 7 14 13 12 11 10 9 8
R4
R11
IC-1
C11
LED
R5
XTAL C15
1 2
IC-2
6 NC 5 4
R7
NC 3
D1 C13 C14 SUPPLY D2
R9 ZD1 ZD2 R10
C9
C10 R8
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ILA19002
Parts List for Application Circuit: Figure 1 Item Symbol Description 1 IC-1 ILA19002 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% metal 9 R2 Resistor, 1% metal 10 R3 Resistor, 390k, (230VAC) 1%, metal 11 R4 Resistor, 1M, 1/4W, 1%, metal 12 R5 Resistor, 470W, 2W, 5%, carbon 13 R6 Resistor, 24k, 1/4W, 1%, metal 14 R7 Resistor, 24k, 1/4W, 1%, metal 15 R8 Resistor, 680W, 1/4W, 1% 16 R9 Resistor, 680W, 1/4W, 1% 17 R10 Resistor, 680W, 1/4W, 1% 18 R11 Resistor, 2.2K, 1/4W, 1% 19 C9 Capacitor, 100nF 20 C10 Capacitor, 100nF 21 C11 Capacitor, 0.47F, 250VAC, polyester 22 C13 Capacitor, 100F 23 C14 Capacitor, 100F 24 C15 Capacitor, 820nF 25 RSH Shunt Resistor 26 LED Light Emitting Diode Detail DIP-14 DIP-6
Colour burst TV Note 1 Note 1
Note 2 Note 3
Note 1: Resistor (R1 and R2) values are dependant upon the selected value of RSH. Note 2: Capacitor (C15) to be positioned as close to Supply Pins (VDD & VSS ) of IC-1 possible. Note 3: See TYPICAL APPLICATIONS when selecting the value of RSH.
as
Korzhenevskogo 12, Minsk, 220108, Republic of Belarus Fax: +375 (17) 278 28 22, 10 Phone: +375 (17) 278 07 11, 212 24 70, 212 24 61, 212 69 16 E-mail: office@bms.by URL: www.bms.by
ILA19002
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
LOAD
R6
CT
RSH
C11
R3
R2
R1
1 2 3 4 5 6 7 14 13 12
R4
IC-1
11 10 9 8
FMO DIR FOUT
XTAL
R7
C9 5V R8 2.4V TO 2.6V DC R9 C10 0V
RSH = TERMINATION RESISTOR FOR CURRENT TRANSFORMER R1 = R2 N L
SUPPLY
Korzhenevskogo 12, Minsk, 220108, Republic of Belarus Fax: +375 (17) 278 28 22, 11 Phone: +375 (17) 278 07 11, 212 24 70, 212 24 61, 212 69 16 E-mail: office@bms.by URL: www.bms.by
ILA19002
Parts List for Application Circuit: Figure 2 Item Symbol Description 1 IC-1 ILA19002 2 XTAL Crystal, 3.5795MHz 3 RSH Resistor 4 R1 Resistor, 1%, metal 5 R2 Resistor, 1%, metal 6 R3 Resistor, 390k, (230VAC), 1%, metal 7 R4 Resistor, 1M, 1/4W, 1%, metal 8 R6 Resistor, 24k, 1/4W, metal 9 R7 Resistor, 24k, 1/4W, 1%, metal 10 R8 Resistor, 2.2k, 1/4W, 1%, metal 11 R9 Resistor, 2.2k, 1/4W, 1%, metal 12 C9 Capacitor, 820nF 13 C10 Capacitor, 100nF 14 C11 Capacitor 15 CT Current transformer Detail DIP-14 Colour burst TV Note 1 Note 2 Note 2
Note 3 Note 4
Note 1: See TYPICAL APPLICATIONS when selecting the value of RSH. Note 2: Resistor (R1and R2) values are dependant upon the selected value of RSH. Note 3: Capacitor (C9) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as possible. Note 4: Capacitor (C11) selected to minimize phase error introduced by current transformer (typically 1.5F).
Korzhenevskogo 12, Minsk, 220108, Republic of Belarus Fax: +375 (17) 278 28 22, 12 Phone: +375 (17) 278 07 11, 212 24 70, 212 24 61, 212 69 16 E-mail: office@bms.by URL: www.bms.by

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