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Refrigerator (Low-End)
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Overview
Refrigerators, which run for all the time, are in strong demand to be low-power consumption as one of the eco-friendly home appliances. In addition, to provide bigger storage space, motors are expected to be smaller and more efficient. Motors also need to be quiet to ensure a comfortable living environment.
Sensor-less control is required as the motor is located inside the refrigerator’s compressor. Therefore a sensor-less brushless motor with inverter control is commonly used in refrigeration applications.
The MCU lineup of Renesas includes the RL78/G14 Group, which provides low lost small pin-count solutions suitable for inverter control in refrigerator applications. Their on-chip features allow refrigerators to be more eco-friendly. For refrigerator system control, the RL78/G13 Group is ideal because they incorporate a variety of A/D converters to precisely control the internal temperature.
System Block Diagram
Recommended Products
| Block | Semiconductor Device | Recommended Product Name | Features, etc. |
|---|---|---|---|
| Control MCU | MCU | RL78/G13 Group | VDD:1.6-5.5V, 32MHz, 8/10-bit A/D: 6-26ch |
| 78K0R/Kx3-L | VDD:1.8-3.6V, 20MHz, 64-128KB Flash | ||
| Reset | RNA519xx Series | 3 V, 5 V reset | |
| EEPROM | R1EX24xxx Series NEW | I2C bus interface *1 | |
| R1EX25xxx Series | SPI bus interface *2 | ||
| Motor MCU | MCU | RL78/G14 Group | Three-phase PWM timer *3 |
| Sensor output | Op-amp | HA1630xxx Series | General use CMOS op-amp |
| μPC358, μPC324 | Low power consumption | ||
| Comparator | HA1631 Series | General use CMOS comparator | |
| μPC393 | Low power consumption | ||
| General use Surge absorption, circuit protection, etc. | Zener diode | HZMxNB Series | 3-terminal (1 device included) face-mount outline High ESD tolerance optimal for use in surge absorption |
| NNCDxxDA Series | High ESD tolerance optimal for use in surge absorption | ||
| RDxxS Series | 2-terminal face-mount outline | ||
| RKZxxKG Series | 2-terminal face-mount outline High ESD tolerance optimal for use in surge absorption | ||
| Switching diode | HSM2838C, HSM123 | 3-terminal (2 devices included) face-mount outline | |
| HSU119/HSC119 | 2-terminal face-mount outline | ||
| Schottky barrier diode | HRB0502A | 3-terminal face-mount outline (low VF) | |
| HRC0103C | 2-terminal face-mount outline (low VF and low leak current) | ||
| HRV103B, RKR104BKH, other | 2-terminal face-mount small outline (Io = 1 A) Low IR optimal for use in circuit protection | ||
| Inverter | MOSFET/IGBT | RJL60xx Series, RJH60Dx Series NEW | |
| Heater | TRIAC | BCR8PM-12LG | |
| MCU peripheral | Sensor signal amplication CMOS op-amp | HA1630xxx Series | Low power consumption |
| Sensor signal amplification op-amp | UPC324 | ||
| Reset IC | RNA519xx Series NEW | Variable detection voltage | |
| PFC power supply | MOS FET | RJK60xx Series | |
| PFC IC | R2A20112 | Critical conduction mode interleaving | |
| R2A20114 | Continuous conduction mode interleaving | ||
| R2A20115 | Continuous conduction mode single | ||
| R2A20117 | Critical conduction mode interleaving | ||
| R2A20118A NEW | Critical conduction mode interleaving | ||
| R2A20132 | Critical conduction mode interleaving | ||
| MCU I/F in control unit | Photocoupler (standard) | PS25xx Series NEW PS27xx Series NEW 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) | PS8101 PS9122 | Analog output, 1 Mbps, 5p-SOP Digital output, 1 Mbps, 5p-SOP | |
| TRIAC control | Photocoupler (standard) | PS25xx Series NEW PS27xx Series NEW 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 |
*1 I2C: Inter-Integrated Circuit
*2 SPI: Serial Peripheral Interface
*3 PWM: Pulse Width Modulation
Related Application Notes/Sample Code
| Name | Document No. |
|---|---|
| Power MOS FET application note | REJ05G0001-0200 |
| R2A20112 application note * | - |
| R2A20114 application note * | - |
| R2A20117 application note * | - |
| R2A20118A application note * | - |
| R2A20121 application note * | - |
| R2A20132 application note * | - |
*：Please contact your sales representative or contact us directly.
Related Boards
| Name | Part No. |
|---|---|
| R2A20111 evaluation board * | - |
| R2A20112 evaluation board * | - |
| R2A20114 Series evaluation board * | - |
| R2A20115 evaluation board * | - |
| R2A20117 evaluation board * | - |
| R2A20118 evaluation board * | - |
| R2A20121 evaluation board * | - |
| R2A20132 evaluation board * | - |
*：Please contact your sales representative or contact us directly.
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