Power Meter (Single-phase)
详情介绍
Overview
Electronic power meters have been increasingly adopted world wide as a means, to support AMR (Automatic Meter Reading) and AMI (Advanced Meter Infrastructure), and to protect from tamper use of electricity. Recently, energy-saving and eco-friendly products are becoming popular. The use of smart meters, which control household equipment, is expanding with the goal of realizing a smart grid that will enable the energy efficiency of a geographical area to be improved. As power meters become a communication gateway to the home, they are becoming more advanced in both their performance and functionality.
A power meter must operate on its internal battery from factory shipment to the installation. Low-power consumption is essential when only the real-time clock (RTC) is running. Also needed are each communication interface for AMR and AMI support, infrared communication for meter reading, and data transfer to and from prepaid cards.
Renesas has a rich lineup of control microcontrollers for single-phase meter. RL78/I1B Group, RL78/I1C Group and RX21A Group with a built-in 24-bit ΔΣ(delta-sigma) ADC help to reduce costs and external components. RL78/I1C Group and RX21A Group also support enhanced security functions. Renesas offers low-cost and low power consumption microcontrollers such as the RL78/L1x Series, RX210 Group, and RX220 Group when using an external ΔΣADC. Renesas also, offers a lineup of microcontrollers with built-in ZigBee/IEEE802.15.4 and Power Line Communication (PLC) functions essential to smart meter.
System Block Diagram (Main control block: MCU with embedded ΔΣADC)
System Block Diagram (Main control block: MCU with no embedded ΔΣADC)
System Block Diagram (Sensor and power supply block)
Recommended Products
| Block | Semiconductor device | Recommended products | Features, etc. |
|---|---|---|---|
| Control MCU | MCU (ΔΣADC integrated) |
RL78/I1B Group | 16-bit CPU, 24-bit ΔΣADC, LCD controller/driver, battery back up |
| RL78/I1C Group | 16-bit CPU, 24-bit ΔΣADC, LCD controller/driver, battery back up, AES | ||
| RX21A Group | 32-bit CPU, high capacity memory, DataFlash 24-bit ΔΣADC (7units, SNDR 85dB) |
||
| MCU | RL78/L1x Series | LCD driver, ultra low power consumption | |
| RX210 Group | 32-bit CPU (50MHz max), high capacity memory | ||
| RX220 Group | 32-bit CPU (32MHz max), low pin count | ||
| EEPROM | R1EX24xxx Series | I 2 C bus interface *1 | |
| R1EX25xxx Series | SPI bus interface *2 | ||
| Communication control block | MCU | RL78/G13 Group | 16-bit CPU |
| RX210 Group | 32-bit CPU (50MHz max), high capacity memory, low power, max 7ch communication function |
||
| RX220 Group | 32-bit CPU (32MHz max), low pin count, low power, max 5ch communication function |
||
| RX631 Group | 32-bit CPU | ||
| RS485 signal I/F | Photocoupler (standard) |
PS23xx Series PS27xx Series PS28xx Series |
High isolation voltage (5kVr.m.s.), 4p-LSOP, Ta=115°C High isolation voltage (3.75kVr.m.s.), 4p-SOP, Ta=110°C High isolation voltage (2.5kVr.m.s.), 4p-SSOP, Ta=110°C |
| Photocoupler (high-speed) |
PS91xx Series (SOP) PS93xx Series (SDIP) PS98xx Series (Small SOP) PS99xx Series (LSDIP) |
Digital output ～15Mbps Low supply current |
*1 I 2 C: Inter-Integrated Circuit
*2 SPI: Serial Peripheral Interface
Related Application Notes/Sample Code
Related Boards
| Title | Document No. |
|---|---|
| Renesas Starter Kit for RX210 | R0K505210S000BE |