PM9105AFA_技术文档

SA9105 APPLICATION NOTE

sames

PM9105AF

THREE PHASE POWER/ENERGY METERING MODULE

PULSE OUTPUT

FEATURES

n

Uses current transformers for current

sensing

n

Performsone,twoorthreephasepower

and energy measurement

Meets the accuracy requirements for

Class 1 AC Watt hour meters

n

Three pulse rate outputs available

Protected agianst ESD

Operates over a wide Temperature

Range

DESCRIPTION

The SAMES three phase power/energy metering module, the PM9105AF provides three

pulse rate output options, the frequency of which are proportional to the active power

consumption.

Energy consumption can be 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 three phase power/energy metering circuit is

ideally suited for energy calculations in applications using a µ-controller or mechanical

counter.

The application utilises the SAMES SA9105AF, SA9105EF or SA9105FF three phase

power metering integrated circuits for power measurement.

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PDS038-SA9105-001

Rev. B

13-09-95

PM9105AF

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS *

Parameter

Symbol

V_AC

Min

Max

540

Unit

V

Supply Voltage (Note 1)

Storage Temperature

T_STG

-25

-10

+125

+70

°C

Operating Temperature (Note 2)

T_O

Note 1:

Note 2:

Voltages are specified with reference to Neutral.

The SA9105 integrated circuit is specified to operate over the temperature

range -10°C to +70°C. The module functionality will however depend upon

the external components used.

* Stressesabovethoselistedunder"AbsoluteMaximumRatings"maycausepermanent

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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ELECTRICAL CHARACTERISTICS

(Over the temperature range -10°C to +70°C, unless otherwise specified. Power

consumption figures are applicable to the PM9105AFE only.)

Parameter

Symbol Min Typ Max Unit Condition

Supply Voltage (x3 Phases) V_AC

(Continuous)

180 230 265

90 115 138

V

PM9105AFE

PM9105AFA

Frequency Output

Power Consumption¹

FOUTX Refer to applicable IC data sheet

100 mW V_DD= 5V

Note 1:

Power consumption specifications exclude power consumed by the current

sensors.

CONNECTION DESCRIPTION

Designation

Description

PL5

Voltage Supply connected to Phase 1

Voltage Supply connected to Phase 2

Voltage Supply connected to Phase 3

Voltage Supply connected to Neutral Line (Common)

Power Output: 4Hz at rated current

Power Output: 290 Hz at rated current

Power Output: 1160 Hz at rated current

0V (Common)

PL6

PL4

5V DC Supply Voltage

0V DC Supply Voltage

CT1

CT2

CT3

Phase 1 (Direction indicated on PCB)

Phase 2 (Direction indicated on PCB)

Phase 3 (Direction indicated on PCB)

FUNCTIONAL DESCRIPTION

1. Power Calculation

IntheApplicationCircuit(seeFigure2), theoutputcurrentsfromthecurrentsensors

will be between 0 and 16µA. The current input stages saturate at input currents

greater than 18µA_RMS. The mains voltage (mains voltage + 15% - 20%) is used for

thepowercalculation, togetherwiththecurrentinformationfromthecurrentsensors

(current transformers).

The calculated power for the 3 phases is integrated over time and converted into a

corresponding frequency.

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For rated conditions, the signals into the current and voltage sensor inputs are set

as follows:

Current sensor input currents: 16µ A_RMS

Voltage sensor input currents: 14µ A_RMS

Under these conditions, the device generates a pulse rate of 1,16kHz at output

FOUT1.

The output frequency at FOUT2 is FOUT1/4. At FOUT3 the output frequency is

FOUT1/290.

2. Electrostatic Discharge (ESD) Protection

The device's inputs/outputs are protected against ESD according to Mil-Std 883C,

method 3015. The modules resistance to transients will be dependant upon the

protection components used.

3. Power Consumption

Theoverallpowerconsumptionratingforthispowermeteringapplication(Figure2),

is under 500mW, excluding the current sensors.

4. Isolation

The reference for the unit is connected to neutral.

5. Circuit Description

The module is supplied from an external 5V DC supply.

TheApplicationCircuit(figure2), detailsthecomponentsrequiredforathreephase

power metering module. Terminated current transformers are used as current

sensors.

The most important external components are:

C₇, C₉, C₁₀and C₁₁are the outer loop capacitors for the integrated oversampling

A/D converters. The typical value of C₇is 2.2nF and the value of C₉, C₁₀and C₁₁is

560pF.

The actual values determine the signal to noise and stability performance. The

tolerances should be within ± 10%.

C₄, C₅, C₆and C₈are the inner loop capacitors for the integrated oversampling

A/D converters. The typical value of C₄, C₅, C₆and C₈is 3.3nF. Values smaller than

0.5nF and larger than 5nF should be avoided.

Terminated current sensors (current transformers) are connected to the current

sensor inputs of the SA9105 through current setting resistors (R₈..R₁₃).

The resistor values should be selected for an input current of 16µA into the SA9105

at the rated line current.

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The values of these resistors should be calculated as follows:

Phase 1:

R₈= R₉= (I_L1/16µA) x R₁₈/2

Phase 2:

R₁₀= R₁₁= (I_L2/16µA) x R₁₉/2

Phase 3:

R₁₂= R₁₃= (I_L3/16µA) x R₂₀/2

Where I_LX

=

Secondary CT current at rated conditions.

Termination resistors of the three current transformers.

R₁₈, R₁₉and R₂₀

R₁+ R_1A, R₄and R₁₅set the current for the phase 1 voltage sense input. R₂+ R_2A,

R₅+P₅andR₁₆setthecurrentforphase2andR₃+R_3A,R₆+P₆andR₁₇setthecurrent

forPhase3. Thevaluesshouldbeselectedsothattheinputcurrentsintothevoltage

sense inputs (virtual ground) is set to 14µA at nominal line voltage. Capacitors C1,

C2 and C3 are for decoupling and phase compensation.

R₁₄+ P₁₄defines all on-chip bias and reference currents. With R₁₄+ P₁₄= 24kΩ,

optimumconditionsareset. P₁₄maybevariedwithin± 10%forcalibrationpurposes.

Any changes to R₁₄will affect the output quadratically (i.e: ∆R = +5%, ∆FOUT =

+10%).

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.

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Figure 1: Connection Diagram

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PM9105AF

Figure 2: Application for Three Phase Power/Energy Measurement.

MAINS VOLTAGES

R1

R2

R1A

R2A

PH1

PH2

R3

R3A

PH3

N

34

44

24

5 V

12

10

0 V

11

13

14

C9

C4

C5

9

8

R7

C10

15

7

6

16

17

C6

R15

+ C1

5

4

3

SA9105

PLCC-44

IC-1

R18

R19

R20

R16

R17

C2

C3

R8

+

2.5V

18

CT1

CT2

CT3

R9

19

20

21

R10

R11

R12

R13

R6

P6

R5

P5

R4

R21

2

1

C14

C11

22

43

42

5 V

23

25

41

40

C7

C8

2.5V

C13

0 V

26

27

28

39

38

FOUT3

FOUT2

0 V

29

32

33

30

37

36

0 V

FOUT1

0 V

35

31

XTAL

5 V

C12

R14

P14

DR-00882

O V

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PM9105AF

Parts List for Application Circuit: Figure 2

Item

1

Symbol

IC-1

XTAL

R1

R1A

R2

Description

SA9105AF/SA9105EF

Detail

PLCC-44

TV Crystal

Note 4

2

Crystal, 3.5795 MHz

3

4

Resistor, 1%, ¼W, Metal

Resistor, 24k, 1%, ¼W, Metal

Resistor, 22k, 1%, ¼W, Metal

Resistor, 820Ω, 1%, ¼W, Metal

Resistor, 2.7k, 1%, ¼W, Metal

Resistor, 22k, 1%, ¼W, Metal

Resistor, 1M, 1%, ¼W, Metal

Resistor, 2.7Ω, 1%, ¼W, Metal

Resistor, 820Ω, 1%, ¼W, Metal

Potentiometer, 4.7k

5

6

R2A

R3

7

8

9

R3A

R4

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

37

38

39

40

R5

R6

R7

R8

R9

Note 1

R10

R11

R12

R13

R14

R15

R16

R17

R18

R19

R20

R21

P5

Note 1

Multi turn

Note 2

P6

P14

C1

Potentiometer, 4.7k

Capacitor, electrolytic, 1µF, 16V

Capacitor, ceramic, 3.3nF

Capacitor, ceramic, 2.2nF

Capacitor, ceramic, 3.3nF

Capacitor, ceramic, 560pF

C2

Note 2

C3

Note 2

C4

C5

C6

C7

C8

C9

C10

C11

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PM9105AF

Parts List for Application Circuit: Figure 2 (Continued)

Item

41

42

Symbol

C12

C13

Description

Detail

Capacitor, ceramic, 100nF

Capacitor, ceramic, 820nF

Capacitor, ceramic, 100nF

Note 3

43

C14

Note 1: Resistor (R₈, R₉, R₁₀, R₁₁, R₁₂and R₁₃) values are dependant upon the selected

values of the current transformer termination resistors R₁₈, R₁₉and R₂₀.

Note 2: Capacitorvaluesmaybeselectedtocompensateforphaseerrorscausedbythe

current transformers

Note 3: Capacitor (C13) to be positioned as close to Supply Pins (V_DD& V_SS) of IC-1, as

possible.

Note 4: See the table below detailing the component values for the selected voltage

standard.

Description

Item

Symbol

Detail

PM9105AFA

115V

PM9105AFE

230V

3

4

5

6

7

8

R1

R1A

R2

R2A

R3

200kΩ

180kΩ

200kΩ

180kΩ

200kΩ

180kΩ

120kΩ

82kΩ

120kΩ

82kΩ

120kΩ

82kΩ

R3A

ORDERING INFORMATION

Part Number

Description

PM9105AFA

PM9105AFE

3 X 115V, 3 X 80A Module

3 X 230V, 3 X 80A Module

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Disclaimer:

TheinformationcontainedinthisdocumentisconfidentialandproprietarytoSouthAfricanMicro-

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,deliveryofthisdocumentshallnotunderanycircumstancescreateanyimplicationthat the

informationcontainedhereiniscorrectasofanytimesubsequenttosuchdate. SAMESdoesnotundertaketoinform

anyrecipientofthisdocumentofanychangesintheinformationcontainedherein,andSAMESexpresslyreserves

therighttomakechangesinsuchinformation,withoutnotification,evenifsuchchangeswouldrenderinformation

containedhereininaccurateorincomplete. SAMESmakesnorepresentationorwarrantythatanycircuitdesigned

byreferencetotheinformationcontainedherein, willfunctionwithouterrorsandasintendedbythedesigner.

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,

Lynn East,

0039

33 Eland Street,

Koedoespoort Industrial Area,

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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型号：	PM9105AFA
厂家：	SAMES
描述：	THREE PHASE POWER/ENERGY METERING MODULE PULSE OUTPUT 三相功率/电能计量模块脉冲输出脉冲输出元件
文件：	总10页 (文件大小：112K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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