Americas
Power Meter (Single-phase)
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 reduce fraudulent 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 when it leaves the factory to when it is installed at its final destination. 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-phrase meter. The 78K0/Lx3-M, 78K0R/Lx-3, and RX21A Group with a built-in 24-bit ΔΣ(delta-sigma) ADC help to reduce costs and external components. Renesas offers low-cost and low power consumption microcontrollers such as the RL78/L1x, RX210, and RX220 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.
Within the MCU lineup of Renesas, the 78K0R/Lx3 and the R8C/Lx Series implements three UART channels on-chip, enabling a variety of communication formats used by smart meters, and its integrated RTC operates on very little power. It is also equipped with large-capacity memory, making possible more sophisticated smart meter functions. Additional integrated functions include an on-chip oscillator (OCO), a watchdog timer (WDT), and an LCD drive control circuit. These reduce the number of external parts needed and helping to reduce the overall system cost.
System Block Diagram (Main control block)
System Block Diagram (Main control block)
System Block Diagram (Sensor and power supply block)
Recommended Products
| Block | Semiconductor device | Recommended products | Features, etc. |
|---|---|---|---|
| Control MCU | MCU (ΔΣADC integrated) | 78K0/Lx3-M | 8-bit CPU, 24-bit ΔΣADC, LCD driver, power calculation circuit |
| 78K0R/Lx3-M | 16-bit CPU, 24-bit ΔΣADC, LCD driver, | ||
| RX21A Group | 32-bit CPU, high capacity memory, DataFlash 24-bit ΔΣADC (7units, SNDR 85dB) | ||
| MCU | R8C/Lx Series | LCD driver, low power consumption | |
| RL78/L1x | 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 | I2C bus interface *1 | |
| R1EX25xxx Series | SPI bus interface *2 | ||
| General use surge absorption circuit protection, etc. | Zener diode | NNCDxxDA Series | High ESD tolerance optimal for use in surge absorption |
| RDxxS Series | 2-terminal face-mount outline | ||
| Power supply | Series regulator | UPC78L00 Series | Standard type |
| UPC29L00 Series | Low saturation type | ||
| RS485 signal I/F | Photocoupler (standard) | PS25xx Series PS27xx Series PS28xx Series | High isolation voltage (5 kV r.m.s.), 4p-DIP High isolation voltage (3.75 kV r.m.s.) 4p-SOP High isolation voltage (2.5 kV r.m.s.), 4p-SSOP |
| Photocoupler (high-speed) | PS2513-1 PS2514-1 | High isolation voltage (5 kV r.m.s.), 4p-DIP PS2513-1: suitable for 10 kbps PS2514-1: suitable for 20 kpbs |
*1 I2C: Inter-Integrated Circuit
*2 SPI: Serial Peripheral Interface
Related Application Notes/Sample Code
| Title | Document No. |
|---|---|
| R8C/35C Group A/D Read | REJ05B1331-0100 |
| R8C/35C Group A/D Converter in Single Sweep Mode | REJ05B1332-0100 |
| R8C/L3AC Group LCD Drive Control Circuit (External Division Resistor, Blink Function) | REJ05B1164-0100 |
| R8C/L3AC Group LCD Drive Control Circuit (External Voltage Multiplier Reference Power, Blink Function) | REJ05B1165-0100 |
| RX210 Group Initial Setting | R01AN1002EJ0100 |
| RX210 Group Register Write Protection Setting Example | R01AN1206EJ0100 |
| RX210 Group Perpetual Calendar Temperature Correction Using the RTC | R01AN1204EJ0100 |
| RX210 Group Setting the A/D Converted Value Addition Function | R01AN1199EJ0100 |
| RX210 Group Setting A/D Conversion Using Group Scan Function in Double Trigger Mode | R01AN1205EJ0100 |
Related Boards
| Title | Document No. |
|---|---|
| Renesas Starter Kit for R8C/L3AC | R0K52L3A0S000BE |
| Renesas Starter Kit for RX210 | R0K505210S000BE |
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