SA2005FPA_技术文档

Three Phase Bidirectional Power/Energy

Metering IC with Instantaneous Pulse Output

SA2005F

ssames

FEATURES

n

Operates over a wide temperature range

n

Functionally compatible with the SA9105F with reduced

external components

Performs bidirectional one, two or three phase power and

energymeasurement

Meets the IEC 521/1036 Specification requirements for

Class1ACWatthourmeters

Uses current transformers for current sensing

Easily adaptable to different signal levels

Precision voltage reference on chip

Precision oscillator on chip.

Protected against ESD

DESCRIPTION

The SAMES SA2005F is an enhancement of the SA9105F. A

precision oscillator and the loop capacitors are integrated on

chip.

Energy consumption is determined by integrating the power

measurement over time.

This innovate universal three phase power/energy metering

integrated circuit is ideally suited for applications such as

residential and industrial energy metering and control.

The SAMES SA2005F three phase bidirectional power/energy

metering integrated circuit generates pulse rate outputs for

positive and negative energy directions. The frequency of the

pulses is proportional to the measured power consumption.

The SA2005F performs active power calculation.

The SA2005F integrated circuit is available in 20 pin dual-in-

line plastic (DIP-20), and 20 pin small outline (SOIC-20)

package types.

The method of calculation takes the power factor into account.

VDD VSS

PGM0

PGM1

IIN1

IIP1

I1

X

IVN1

V1

POWER

INTEGRATE

AND

IIN2

IIP2

FOUT

I2

TO

PULSE

RATE

IVN2

V2

DIR

AVERAGE

IIN3

IIP3

I3

IVN3

V3

GND

REF

TIMING & CONTROL

OSC

Dr-01570

VREF

TCLK

TEST

Figure 1: Block Diagram

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SPEC-0042 (REV. 1)

03-07-00

SA2005F

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ELECTRICAL CHARACTERISTICS

#

(V = 2.5V, V = -2.5V, over the temperature range -10°C to +70°C , unless otherwise specified.)

SS

DD

Symbol

Typ

Parameter

Min

-25

4.5

Max

+85

5.5

Unit

Condition

Operating temp. Range

T

O

°C

V

Supply Voltage

V

DD

- V

SS

I

DD

mA

Output unloaded

10

Supply Current

1% - 100% of rated

power

Nonlinearity of Power

Calculation

-0.3

-25

+0.3

%

µA

Current Sensor Inputs (Diffferential)

Input Current Range

I

+25

Peak value

II

Voltage Sensor Input (Asymmetrical)

I

IV

+25

Peak value

Input Current Range

Pins FOUT, DIR

V

OL

V

I

= 5mA

V -1

DD

V +1

SS

Output Low Voltage

Output High Voltage

OL

OH

I

OH

= -2mA

MODES 0, 1, 2

Pulse Rate: FOUT

Hz

0

f

P

64

Specified linearity

Min and Max limits

200

MODE 3

f

P

0

1160

3500

Hz

Specified linearity

Min and Max Limits

Pin PGM0, PGM1, TEST, TCLK

High Voltage

V

V -1

DD

V

IH

Low Voltage

V +1

SS

IL

With R = 24kW

Pin VREF

50

connected to V

-I

45

Ref. Current

Ref. Voltage

55

µA

V

SS

R

1.1

1.3

Referred to V

V

SS

R

ABSOLUTE MAXIMUM RATINGS*

Parameter

Symbol

Min

-0.3

-150

-40

Max

Unit

V

mA

°C

Supply Voltage

V -V

DD

6.0

SS

Current on any pin

Storage Temperature

Operating Temperature

I

+150

+125

+85

T

STG

T

O

-40

°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 condition 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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SA2005F

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PIN DESCRIPTION

Designation

Description

Analog Ground. The voltage to this pin should be mid-way between V and V .

SS

16

GND

DD

V

DD

Positive Supply voltage.

6

V

SS

14

Negative Supply voltage.

The current into the A/D converter should be set at 14µA at nominal mains

RMS

17, 20, 3

IVN1, IVN2, IVN3

voltage. The voltage sense input saturates at an input current of ±25µA peak.

Inputs from current sensors. The shunt resistor voltage from each channel is

19, 18, 2, 1,

5, 4

IIN1, IIP1, IIN2, IIP2,

converted to a current of 16µA at rated conditions. The current sense input

RMS

IIN3, IIP3

saturates at an input current of ±25µA peak.

This pin provides the connection for the reference current setting resistor.

15

7, 10

8

VREF

TCLK, TEST

FOUT

A 24kW resistor connected to V sets the optimum operating condition.

SS

Test inputs. For normal operation these pins must be connected to V .

SS

Pulse rate output. The pulse frequency is proportional to the sum of the power

measured on all three phases. The pulse format also indicates the direction of

energy flow.

9

DIR

Direction output. This output indicates the direction of energy flow.

FOUT Pulse format Select. These inputs define the FOUT pulse width

and format.

12, 13

PGM0, PGM1

ORDERING INFORMATION

IIP2

1

20 IVN2

Part Number

SA2005FPA

SA2005FSA

Package

DIP-20

IIN2

IIN1

2

19

SOIC-20

IVN3

IIP3

3

18 IIP1

IVN1

17

4

IIN3

GND

5

16

15

14

13

12

11

VREF

VDD

6

TEST

VSS

7

FOUT

PGM1

PGM0

NC

8

DIR

9

TCLK

10

DR-01571

Figure 2: Pin connections: Package: DIP-20, SOIC-20

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SA2005F

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FUNCTIONAL DESCRIPTION

The SAMES SA2005F is a CMOS mixed signal integrated

circuit, which performs three phase power/energy calculations

over a range of 1000:1, to an overall accuracy of better than

Class 1.

through clamping diodes, in conjunction with the amplifiers

input configuration. The feedback loops from the outputs of the

amplifiers A and A generate virtual shorts on the signal inputs.

I

V

Exact duplications of the input currents are generated for the

analogprocessingcircuitry.

The SA2005F is functionally similar to the SA9105F. No

external loop capacitors are required and an precision

oscillator is integrated on chip.

VoltageReferenceConnection(VREF)

A bias resistor of 24k provides an optimum bias conditions on

chip. Calibration of the SA2005F should be done on the

voltage inputs of the device as described in Typical

Applications.

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.

CurrentSenseInputs(IIN1, IIP1, IIN2, IIP2, IIN3, IIP3)

At rated current the resistor values should be selected for input

currents of 16µA . Referring to figure 5, the resistors R1 and

RMS

The SA2005F generates pulses with a frequency proportional

to the power measured. The pulse rate follows the

instantaneous power measured. The pulse frequency is

proportionaltothetotalsumofthethreephases.

R2 on current channel 1, resistors R3 and R4 on current

channel 2 and resistors R5 and R6 on current channel 3, define

the current level into the current sense inputs of the SA2005F.

The current sense inputs saturates at an input current of ±25µA

peak. Resistors R25, R26 and R27 are the current transformer

termination resistors. The voltage drop across the termination

resistors should be at least 20mV at rated conditions. Values

forthecurrentsenseinputsarecalculatedasfollows:

POWER CALCULATION

In the application circuit (figure 5), the mains voltages from V1,

V2 and V3, are converted to currents and applied to the voltage

senseinputsIVP1, IVP2andIVP3.

R =R =(I /16µA )xR /2

RMS

1

2

L

25

R =R =(I /16µA )xR /2

RMS

3

4

L

26

The current levels on the voltage sense inputs are derived from

the mains voltages (3 x 230VAC) being divided down to 14V

through voltage dividers. The resulting input currents into the

R =R =(I /16µA )xR /2

RMS

5

6

L

27

Where:

A/D converters are 14µA through the resistors R8, R9 and

RMS

I =Linecurrent/CT-ratio

L

R10.

V

DD

For the current sense inputs the voltage drop across the

current transformers terminating resistors are converted to

IIP

currents of 16µA at rated conditions, by means of resistors

RMS

R1, R2 (Phase 1); R3, R4 (Phase 2) and R5, R6 (Phase 3). The

signals providing the current information are applied to the

currentsensorinputsIIN1, IIP1, IIN2, IIP2andIIN3, IIP3.

V

SS

CURRENT

SENSOR

INPUTS

A_I

DD

IIN

The output frequency of the SA2005F energy metering

integrated circuit at rated conditions is 64Hz on FOUT

(PGM0=0, PGM1=1).

V

SS

V

DD

IVP

One pulse (measured in Watt second) correspond to an energy

measuredof3xI

xV

/64Hz.

VOLTAGE

SENSOR

INPUT

RATED

V

SS

A

V

ForamoredetaileddescriptionseetheInputSignalssection.

INPUT SIGNALS

GND

Analog Input Configuration

DR-01288

The current and voltage sensor inputs are illustrated in figure 3.

These inputs are protected against electrostatic discharge

Figure 3: Analog Input Internal Configuration

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SA2005F

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Voltage Sense Inputs (IVN1, IVN2, IVN3)

The current into the voltage sense inputs (virtual ground)

DIR as a logic 1. The DIR pin may be used to drive a LED in

order to indicate reverse energy flow.

should be set to 14µA

at rated voltage conditions. The

RMS

individual mains voltages are divided down to 14V

per

RMS

phase. The resistors R8, R9 and R10 set the current for the

voltage sense inputs. The voltage sense inputs saturate at an

input current of ±25µA peak.

Frequency Output (FOUT)

The sum of the measured power, from the three phases

produce a pulse rate of 64Hz or 1160Hz (mode 3), at rated

conditions on FOUT. The format of the pulse output signal,

which provides power/energy and direction information is

shown in figure 4. Refer to Pulse Programming Inputs for pulse

widths.

Pulse Programming Inputs (PGM0, PGM1)

The pulse programming inputs PGM1 and PGM0 define the

representation of energy measured by the device on FOUT.

The table below shows the difference between the various

modes.

The following equation may be used for calculating the output

frequency:

Forward

Pulse

Reverse

Pulse

Frequency

Mode PGM1 PGM0 at rated

conditions

f = 11.16 x FOUTX x ((I x I )+(I x I )+(I x I )) / 3 x I

R

Width

I1

V1

I2

V2

I3

V3

Where:

FOUTX = Nominal rated frequency (64Hz/1160Hz)

0

1

0

1

2

3

64Hz

1.14ms

71µs

3.4ms

1.14ms

71µs

0

1

0

1

I , I , I = Input currents for current sensor inputs (16µA at rated

I1 I2 I3

line current)

64Hz

I , I , I = Input currents for voltage sensor inputs (14µA at

V3

V1

V2

1160Hz

rated line voltage)

I = Reference current (typically 50µA)

R

Test Inputs (TCLK, TEST)

An integrated anti-creep function ensures that no pulses are

generated at zero line currents.

The TEST and TCLK inputs are manufacturers test pins and

must be connected to VSS in a metering application.

ELECTROSTATIC DISCHARGE (ESD) PROTECTION

The SA2005F integrated circuit's inputs/outputs are protected

against ESD.

OUTPUT SIGNALS

Direction Indication (DIRO)

The SA2005F indicates the measured energy flow direction on

pin DIR. A logic 0 on pin DIR indicates reverse energy flow.

Reverse energy flow is defined as the condition where the

voltage sense input and current sense input are out of phase

(greater than 90 degrees). Positive energy flow, when voltage

sense and current sense input are in phase, is indicated on pin

POWER CONSUMPTION

The overall power consumption rating of the SA2005F

integrated circuit is less than 50 mW with a 5V supply.

MODE 0

FOUT

MODE1

FOUT

MODE2

FOUT

MODE3

FOUT

DIR

DR-01582

Note: Frequency of pulse rate in MODE 3 is 18 times higher than other modes

Figure 4: FOUT options

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SA2005F

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TYPICAL APPLICATION

VOLTAGEDIVIDER

In figure 5, the components required for the three phase

power/energy metering section of a meter, is shown. The

application uses current transformers for current sensing. The

4-wire meter section is capable of measuring 3x230V/80A with

precision better than Class 1.

The voltage divider is calculated for a voltage drop of 14V.

Equationsforthevoltagedividerinfigure5are:

RA=R16+R19+R22

RB=R8||(R13+P1)

Combiningthetwoequationsgives:

The most important external components for the SA2005F

integrated circuit are the current sense resistors, the voltage

sense resistors as well as the bias setting resistor.

(RA+RB)/230V=RB/14V

A 5k trimpot is used in each of voltage channel for meter

calibration. The center position of the pot is used in the

calculations. P1 = 2.5k and values for resistors R13 = 22k and

R8=1Mischosen.

BIAS RESISTOR

R7 defines all on-chip and reference currents. With R7=24kW,

optimum conditions are set. Device calibration is done on the

voltage inputs of the device.

Substitutingthevaluesresultin:

RB=23.9k

RA=RBx(230V/14V-1)

RA=368.9k.

CT TERMINATION RESISTOR

The voltage drop across the CT termination resistor at rated

current should be at least 20mV. The CT’s used have low

phase shift and a ratio of 1:2500.The CT is terminated with a

2.7W resistor giving a voltage drop across the termination

resistor 864mV at rated conditions (Imax for the meter).

Resistor values of R16, R19 and R22 is chosen to be 120k,

120kand130k.

CURRENT SENSE RESISTORS

The three voltage channels are identical so R14= R15= R16 =

R17=R18=R19andR20=R21=R22.

The resistors R1 and R2 define the current level into the

current sense inputs of phase one of the device. The resistor

values are selected for an input current of 16µA on the current

inputs at rated conditions.

According to equation described in the Current Sense inputs

section:

R1 = R2 = (I / 16µA ) x R / 2

SH

L

=80A/2500/16µAx2.7W /2

=2.7kW

I =Linecurrent/CTRatio

L

The three current channels are identical so R1 = R2 = R3 = R4

=R5=R6.

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SA2005F

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Parts List for Application Circuit: Figure 5

Symbol

Description

Detail

DIP-20/SOIC-20

Note 1

U1

SA2005F

Resistor, 2.7k, 1/4W, 1% metal

Resistor, 24k, 1/4W, 1%, metal

Resistor, 1M, 1/4W, 1%, metal

Resistor, 22k, 1/4W, 1%, metal

R1

R2

Note 1

R3

Note 1

R4

Note 1

R5

Note 1

R6

Note 1

R7

R8

R9

R10

R11

R12

R13

R14

R15

R16

R17

R18

R19

R20

Resistor, 120k, 1/4W, 1%, metal

Resistor, 130k, 1/4W, 1%, metal

R21

R22

R23

R24

R25

R26

R27

P1

Resistor, 130k, 1/4W, 1%, metal

Resistor, 1k, 1/4W, 1%, metal

Resistor, 2.7R, 1/4W, 1%, metal

Trim pot, 5k, Multi turn

Note 1

Trim pot, 5k, Multi turn

P2

Note 1

Trim pot, 5k, Multi turn

C1

Capacitor, 220nF

C2

Capacitor, 220nF

Capacitor, 820nF

C3

Note 2

Note 3

C4

Capacitor, 820nF

C5

Capacitor, 820nF

C6

Capacitor, 820nF

LED1

LED2

CT1

CT2

CT3

3mm Light emitting diode

Current Transformer, TZ76

Note 1: Resistor (R1 to R6) values are dependant on the selection of the termination resistors (R25 to R27) and CT combination.

Note 2: Capacitor values may be selected to compensate for phase errors caused by the current transformers.

Note 3: Capacitor C6 to be positioned as close as possible to supply pins V and V of U1 as possible.

DD

SS

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SA2005F

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NOTES:

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PSMA29060057FAP

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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

DIVISION OF LABAT TECHNOLOGIES (PTY) LTD

Tel: (012) 333-6021

Tel: Int +27 12 333-6021

Fax: (012) 333-8071

Fax: Int +27 12 333-8071

33 ELAND STREET

KOEDOESPOORT INDUSTRIAL AREA

PRETORIA

P O BOX 15888

33 ELAND STREET

LYNN EAST 0039

REPUBLIC OF SOUTH AFRICA

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型号：	SA2005FPA
厂家：	SAMES
描述：	Three Phase Bidirectional Power/Energy Metering IC with Instantaneous Pulse Output 三相双向功率/电能计量IC，具有瞬时脉冲输出脉冲光电二极管
文件：	总10页 (文件大小：109K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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