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Microwave Oven (High-End)

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Microwave Oven (High-End)

Overview

Microwave ovens have become ubiquitous electronic household cooking appliances due to their cooking method of heating food uniformly. But now modern high-end microwaves provide a variety of preparation functions, such as "simmer", "deep fry", "roast", "steam", and some models are now capable of baking bread with a "leaven" function. Microwave ovens are starting gaining attention as a healthy electric household appliance, capable of preparing food with low sodium or fat.

In order to implement such functions, microwave ovens increasingly require fine-grained output control, based on data obtained from thermal sensors, infrared sensors, weight sensors, etc. In structural terms, the main output of a microwave oven is produced by a magnetron, with an IGBT performing high-frequency switching and supplying high-voltage output to the magnetron.

Renesas has a broad lineup of microcontroller products suitable for microwave ovens. These include RL78/L1x Series of LCD MCUs, which are built around a high-performance CPU and integrate a PWM (Pulse Width Modulation) function for IGBT control and A/D converters to handle a variety of sensor inputs, and R8C/3xT, which incorporates a touch detection circuit.

System Block Diagram

Recommended Products

Block Semiconductor Device Recommended Product Name Features, etc.
System control MCU RL78/L1x On-chip LCD Display control function, 16-bit MCU
R8C/L3xM,L3xC,LAxA Group On-chip LCD Display control function, 16-bit MCU
RL78/G1x General purpose 16-bit MCU
EEPROM R1EX24xxx Series I2C bus interface *1
R1EX25xxx Series SPI bus interface *2
Touch key control MCU R8C/33T,36T-A,38T-A Group Capacitive Touch key control
Power device TRIAC BCR1AM-8 Compartment lamp
BCR16CM
Power supply IC for power supply HA17431 Series Shunt regulator 1%, 0.5% precision
HA178L05UA
3-terminal regulator
μPC1093, μPC1943/1944 Shunt regulator
MCU peripheral Reset IC RNA519xx Series Variable detection voltage
Sensor output amplification, detection Op-amp HA1630xxx Series General use CMOS op-amp
μPC324 Low power consumption
Comparator HA1631 Series General use CMOS comparator
μPC393 Low power consumption
IGBT gate driver Photocoupler
(IGBT drive)
PS93xx Series
(6/8p-SDIP)
PS94xx Series
(16p-SOP)
PS95xx Series
(8p-DIP)
PS99xx Series
(8p-LSDIP)
High isolation voltage (5kV~7.5kVr.m.s.)
0.6~2.5A output
High CMR (CMR≧50kV/μs)
TRIAC control 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
Inverter IGBT RJH1BFxR
RJH60Fx

1100V
600V

*1 I2C : Inter-Integrated Circuit
*2 SPI : Serial Peripheral Interface

Related application notes/Sample Code

Name Document No.
RL78/G14 Sound Playback Demonstration for RL78/G14 CPU Board
R20AN0194EJ0100
RL78/G14 Setting the Window ComparatorR01AN1230EJ0110
RL78/L12 Utilising the Real Time Clock for e2studioR01AN1588EG0100
RL78/L12 Utilising Timer PWM for e2studioR01AN1596EG0100
RL78 Family M3S-S2-Tiny: ADPCM Encoder/Decoder Introduction GuideR20AN0122EJ0100
RL78 Family Notes and Countermeasures Against NoiseR01AN0839EJ0100
R8C/38C Group Timer RD (PWM3 Mode)R01AN0083EJ0100
R8C/38T-A Group The basic principle of capacitive touchR01AN1531EJ0100
Power MOS FET application note REJ05G0001-0200
R2A20112 application note *
-
R2A20114 application note *
-
R2A20117 application note *
-
R2A20118A 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 *
-
R2A20118A evaluation board *
-
R2A20132 evaluation board *
-

*:Please contact your sales representative or contact us directly.

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Technical Information WEB Magazine RENESAS EDGE


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