Refrigerator (Low-End)

Consumer

Home Appliances

Overview
System Block Diagram
Recommended Products
Related Application Notes/Sample Code
Related Software
Related Boards

Refridgerator (Low-End)

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

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
	MCU	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
	EEPROM	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
	Op-amp	μPC358, μPC324	Low power consumption
	Comparator	HA1631 Series	General use CMOS comparator
	Comparator	μPC393	Low power consumption
General use Surge absorption, circuit protection, etc.	Zener diode	NNCDxxDA Series	High ESD tolerance optimal for use in surge absorption
General use Surge absorption, circuit protection, etc.	Zener diode	RDxxS Series	2-terminal face-mount outline
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	Low power consumption
	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
MCU I/F in control unit	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 Software

Name	Document No.
M3S-S2-Tiny sound playback system *	-

*: 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 *	-