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1-Phase Power Meter

Overview

There are many different solutions on the market for 1-phase power meters to accommodate the customers' varying ranges of design requirements. To ease the design burden and provide flexibility, Renesas has developed an export power meter for the high-end market using an MCU to avoid the limitations of using system-on-chips (SoCs). This design encompasses the full solution including the MCU, a high-speed photocoupler, AC/DC, power device, and memory.

System Benefits​:

  • Compact design based on 72kHz integrated 900V BJT for 18W power supplies, no optocoupler, accurate voltage cross-regulation, compact AC/DC power supplies for smart electricity meters
  • MCU-based design adds flexibility and expanded memory, DLMS supported
  • Easy security/authentication in addition to using NFC connectivity

Block Diagram

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4:3 ratioSheet.1Sheet.2Sheet.3Sheet.4CN204cn204CN204Sheet.16Sheet.17Sheet.18Sheet.19Sheet.20Darlington.131Sheet.22Sheet.23Sheet.24Sheet.25Sheet.26Darlington.131Sheet.135Sheet.91Sheet.92Sheet.93Sheet.94Sheet.95Darlington.131Sheet.109Sheet.110Sheet.111Sheet.112Sheet.113Darlington.131Sheet.115Sheet.116Sheet.117Sheet.118Sheet.119Darlington.131Sheet.121Sheet.122Sheet.123Sheet.124Sheet.125Darlington.131ResistorResistor.166Non-Electric CapSheet.169Sheet.170Sheet.171Sheet.172Sheet.173Inductor Coreless (Air conductor)Sheet.175Sheet.176Sheet.177Sheet.178Sheet.179Sheet.180Sheet.181Sheet.182Sheet.183Chassis GroundSheet.185Sheet.186Resistor.187Resistor.188LoadLoadLoadOp AmpOp AmpOp AmpBuckBuckBuckLine.841Inductor Air Core.212Sheet.195Sheet.196Sheet.197Sheet.198Sheet.199Sheet.200Sheet.201Sheet.202Sheet.203Line.29Inductor Coreless (Air conductor).205Sheet.206Sheet.207Sheet.208Sheet.209Sheet.210Sheet.211Sheet.212Sheet.213Sheet.214Inductor Coreless (Air conductor).215Sheet.216Sheet.217Sheet.218Sheet.219Sheet.220Sheet.221Sheet.222Sheet.223Sheet.224Signal GroundSheet.226Sheet.227Sheet.228Sheet.229Sheet.230Non-Electric Cap.231Sheet.232Sheet.233Sheet.234Sheet.235Sheet.236Sheet.237Sheet.238Sheet.239Sheet.240Sheet.241Darlington.131Sheet.243Sheet.244Sheet.245Sheet.246Sheet.247Darlington.131Chassis Ground.255Sheet.256Sheet.257Ground (earth)Sheet.260Sheet.261Sheet.262Sheet.263LCD SegmentSheet.265Sheet.266Sheet.267Sheet.268Sheet.269Sheet.270Sheet.271Sheet.272Sheet.273Sheet.274Sheet.275Sheet.276Sheet.277Sheet.278Sheet.279Sheet.280Sheet.281Sheet.282Sheet.283Sheet.284Sheet.285Sheet.286Sheet.287Sheet.288Sheet.289Sheet.290Sheet.291Sheet.292Sheet.293Sheet.294ONONSheet.295OFFOFFSheet.296Sheet.297Sheet.298Sheet.299Sheet.300Sheet.301Sheet.302Sheet.304Sheet.305Sheet.306Connector LineSheet.9Sheet.329Sheet.331Sheet.333Sheet.334Sheet.335Sheet.336Connector Line.337Connector Line.338Connector Line.339Connector Line.340Connector Line.341Connector Line.342Connector Line.343Connector 1Connector Line.347Connector Line.348Connector Line.349Connector Line.351Connector 1.352Connector Line.353Sheet.355Connector 1.356Connector Line.357Sheet.358Connector Line.359Connector Line.360Connector Line.361Connector 1.362Connector Line.363Connector Line.364Connector Line.365Connector 1.366Connector 1.367Connector 1.368Connector 1.369Connector 1.370Connector Line.371Connector Line.372Connector 1.373Connector Line.374Connector 1.375Resistor.376Resistor.377Connector Line.379Connector 1.380Connector Line.382Connector 1.383Connector Line.384Connector Line.385Connector Line.390Connector Line.391Non-Electric Cap.393Sheet.394Sheet.395Sheet.396Sheet.397Sheet.398Connector 1.399Connector Line.400Connector 1.401Connector Line.402Connector 1.403Connector Line.404Connector Line.405Connector 1.406Connector 1.407Connector Line.408Resistor.412Resistor.413Connector 1.414Chassis Ground.415Sheet.416Sheet.417Connector Line.419Connector ArrowConnector Arrow.424Connector Line.426Connector Line.427Connector 1.428AC/DCAC/DCAC/DCConnector double arrow.430Connector Line.433Connector Line.435Connector Line.436Connector 1.437Connector double arrow.438Connector double arrowConnector double arrow.440Connector Line.442Connector Line.446Connector Line.449Connector Line.450Connector Line.451Connector Line.452Connector 1.453Connector Arrow.461Connector Line.471EEPROMEEPROMEEPROMFlashFlashFlashNFCNFCNFCPhotocouplerPhotocouplerPhotocouplerRS-485RS-485RS-485PPPPPPNNN12V/1.5A12V/1.5A12V/1.5A5V5V5ViGNDiGNDiGND3.3V / 0.5A3.3V/0.5A3.3V/0.5ACommunication Lines 1222Sheet.484Communication Lines 1.485 222Sheet.487Sheet.491ButtonButtonButtonLCDLCDLCDConnector Line.494Connector 1.495Connector 1.496Connector 1.497Connector 1.498 5V5V5VRS485RS-485RS-485 5V5V5V3.3V3.3V3.3VTo PLCTo PLCTo PLCAC Power SourceAlternating CurrentSheet.510MCUMCUMCUMCU24bit DSADC24bit DSADC24bitDSADCSAR ADCSAR ADCSARADCVrefVrefVrefUARTUARTUARTLCDCLCDCLCDCGPIOGPIOGPIOI2CI2CI2CSPISPISPI

AC/DC

Flyback & Forward Controllers

Buck

Buck Regulators (Integrated FETs)

Op Amp

General-purpose Op Amps

MCU

RL78 Low-Power 8 & 16-Bit MCUs

Photocoupler

High-Speed Digital Output Photocouplers / Optocouplers

RS-485

RS-485/422 with Enhanced ESD Protection

EEPROM

EEPROM & PROM

Flash

SPI NOR Flash

NFC

NFC

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