PM9105AP [SAMES]

THREE PHASE POWER/ENERGY METERING MODULE; 三相功率/电能计量模块


型号：	PM9105AP
厂家：	SAMES
描述：	THREE PHASE POWER/ENERGY METERING MODULE 三相功率/电能计量模块
文件：	总10页 (文件大小：114K)
中文：	中文翻译
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SA9105 APPLICATION NOTE

sames

PM9105AP

THREE PHASE POWER/ENERGY METERING MODULE

PULSE OUTPUT

FEATURES

Uses current transformers for current

sensing

Performsone,twoorthreephasepower

and energy measurement

Meets the accuracy requirements for

Class 1 AC Watt hour meters

Three pulse rate outputs available

Protected agianst ESD

Operates over a wide Temperature

Range

DESCRIPTION

The SAMES three phase power/energy metering module, the PM9105AP 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 SA9105APA, SA9105EPA or SA9105FPA three

phase power metering integrated circuits for power measurement.

The module is supplied configured to operate on 3 x 230V, 3 x 80A mains system. This

canbeadaptedtooperateon3x115V, 3x80Amainssystem. Pleaserefertotheresistor

selection table shown at the end of the Application Circuit parts list.

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PDS038-SA9105-002

Rev. A

07-01-97

PM9105AP

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS *

Parameter

Symbol

V_AC

Min

Max

540

Unit

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.

Parameter

Symbol Min Typ Max Unit Condition

Supply Voltage (x3 Phases) V_AC

(Continuous)

180 230 265

PM9105APE

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.

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

4-P IN

3 5

G N

2 9

A P A 5 0 1 1 9 A

1 - I C S

E F V R

2 8

S S

1 6

D D

L A X T

N I P 2 -

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Parts List for Application Circuit: Figure 2

Item

Symbol

IC-1

XTAL

R1A

Description

SA9105APA/SA9105EPA/SA9105FPA

Crystal, 3.5795 MHz

Detail

DIP-40

TV Crystal

Note 4

Resistor, 1%, ¼W, Metal

R2A

Resistor, 1%, ¼W, Metal

R3A

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

Note 1

R10

R11

R12

R13

R14

R15

R16

R17

R18

R19

R20

R21

Note 1

Multi turn

Note 2

P14

Potentiometer, 4.7k

Capacitor, electrolytic, 1µF, 16V

Capacitor, ceramic, 3.3nF

Capacitor, ceramic, 2.2nF

Capacitor, ceramic, 3.3nF

Capacitor, ceramic, 560pF

Note 2

C10

C11

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Parts List for Application Circuit: Figure 2 (Continued)

Item

Symbol

C12

C13

Description

Detail

Capacitor, ceramic, 100nF

Capacitor, ceramic, 820nF

Capacitor, ceramic, 100nF

Note 3

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

R1A

R2A

R3A

Detail

230V

115V *

120kΩ

82kΩ

120kΩ

82kΩ

200kΩ

180kΩ

200kΩ

180kΩ

200kΩ

180kΩ

120kΩ

82kΩ

If module is required for 115V operation, the resistors in the above table must be

changed to the values shown.

ORDERING INFORMATION

Part Number

Description

PM9105AP

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

information contained herein is correct as of any time subsequent to such date. SAMES does not undertake to

informanyrecipientofthisdocumentofanychangesintheinformationcontainedherein, andSAMESexpressly

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

thedesigner.

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

Any Sales or technical questions may be posted to our e-mail address below:

info@sames.co.za

For the latest updates on datasheets, please visit out web site:

http://www.sames.co.za

Tel:

Fax:

012 333-6021

012 333-8071

Tel:

Fax:

Int +27 12 333-6021

Int +27 12 333-8071

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