Since the birth of the mid-1940s, microwave ovens have been used in the commercial sector. In the 1960s, they entered the home and quickly became popular. Their basic functions and operations have not changed much. In fact, the only major advantage of its implementation is that the user experience is constantly improving and can include more and more features.
Nowadays, microwave ovens have become the basic household appliances of the family like washing machines, and they are housed in thousands of households. Many people are only familiar with its functions, enjoy the convenience of people, and how many people ask it why? Even if you are an electronic expert, you don’t know...
Microwave oven block diagram:
LM25037: Dual Mode PWM Controller with AC Output
Includes all the features of a dual-ended power converter topology to be balanced. Allows higher efficiency and greater power density than common single-ended topologies, such as flyback and forward looking. At the same time, the smallest external component can be configured for voltage mode or current mode control. Set up two alternate gate driver outputs, each capable of 1.2A peak output current. Other features include programmable maximum duty cycle limits, line undervoltage lockout, cycle-by-cycle current limit and fault protection...
characteristic:
1. Can be configured to switch directly from the input voltage rail to a 75V ultra wide range of 5.5V operation
2. Resistor-programmed 2 MHz capability oscillator with low frequency lockout protection
3. Current mode or feedforward voltage mode control, programmable maximum duty cycle limit, 2.0% feedback reference accuracy
Linear regulatorTPS71401: 10V single output LDO, 80mA, adjustable voltage (1.2 to 8.88V), low quiescent current
The low dropout (LDO) regulator provides a wide input voltage range, low dropout voltage, low power operation, and miniaturized packaging. Operating from an input range of 2.5V to 10V combined with a 3.2μA quiescent current makes this device ideal for dual alkaline batteries and other low quiescent current sensitive battery applications. Low dropout voltage and low quiescent current can operate at very low power levels. Therefore, the device is very suitable for power battery management ICs...
characteristic:
1. Can be fixed at 3.3V or adjustable (1.2V to 8.8V) current limit
2. Output current: 80 mA, leakage voltage: 415mV is 50mA load
DC/DC converterMC33063A: 1.5A Peak Step-Up/Buck/Reverse Switching Regulator
An easy-to-use device that includes all the main circuits that require a simple DC-DC converter. These devices primarily include an internal temperature compensation reference, comparator, oscillator, PWM controller with active current limit, driver, and a high current output switch. Therefore, the device requires only a minimum of external components to build boost, buck and inverting topology converters.
High voltage isolationISO722: Single 100Mbps Digital Isolator with Enable
A digital isolator with logic input and output buffers is separated by a silicon dioxide (SiO2) insulating barrier. This barrier can provide up to 4000 V. When used in conjunction with an isolated power supply, these devices prevent the data bus from entering the local ground or other circuit's noise current, or damaging the sensitive circuit's interference galvanic isolation...
characteristic:
1. Typical transient immunity of 50 kV/μs, signal rate 0 Mbps to 150 Mbps
2. Low transmission delay, low pulse deviation (pulse width distortion), low power sleep mode
3. High electromagnetic immunity, low input current requirements, fault protection output, easy replacement for most optoelectronic and magnetic isolation
DC motor driver PWM power driverDRV8800: 2.8A Brushed DC Motor Driver (PWM Control)
By controlling the DC motor with Pulse Width Modulation (PWM), it is possible to output peak currents up to ±2.8 and operating voltages up to 36 V. At the same time, the phase and ENABLE inputs provide speed and direction control of the DC motor by applying external pulse width modulation (PWM) and control signals. The internal synchronous rectification control circuit provides lower power consumption during PWM operation...
characteristic:
1. Internal circuit protection includes motor lead short circuit to power/short to ground, hysteretic thermal shutdown, VBB and VCP, and cross current protection undervoltage monitoring
2. Low on-resistance [RDS(ON)] output, overcurrent protection and motor leads are shorter than power protection
3. Internal undervoltage lockout, cross current protection
DC/DC controllerTPS40200: Wide Input Non-Synchronous Step-Down DC/DC Controller
MOSFET driver
LM25101: 3A, 2A, and 1A High-Voltage, High-Side and Low-Side Gate Drivers
Haptic driver piezoelectric haptic driverDRV2665: Piezo Haptic Driver with Integrated Boost Converter and Digital Front End
A piezo haptic driver with integrated 105V boost switch, integrated power diode, integrated fully differential amplifier, and integrated digital front end. This versatile device is capable of driving high voltage and low voltage piezoelectric haptics. The input signal can be driven as a haptic packet through the I2C port or via an analog input...
characteristic:
1. Boost voltage sets two external resistors and boost current limit, programmed by REXT resistor
2.2 milliseconds typical start-up time, fast response to an ideal piezo haptic driver
3. Simultaneous thermal overload protection to prevent damage when the equipment is overloaded
Motor haptic driverDRV2603: Haptic driver for ERM/LRA with automatic resonance control and analog gain adjustment
Touch screen controllerTSC2006: Nanopower Touch Screen Controller, SPI Serial Interface
A very low power touch screen controller based on an advanced low voltage processor for handheld applications. The supply voltage is as low as 1.2V, which can be powered from a single battery and includes a complete, ultra-low power, 12-bit, analog-to-digital (A/D) resistive touch screen converter that includes drivers and control logic to measure Touch pressure...
biggest advantage:
1. Provide touch screen measurement preprocessing to reduce bus load
2. Can be redirected to a more important functional host processor to reduce resource consumption
3. Supports SPI-compatible serial bus up to 25MHz while providing 10 or 12-bit programmable resolution to accommodate different screen sizes and performance requirements
Relay driverTPL9201: Microcontroller Power Supply and Multiple Low Side Drivers
An eight-low side driver with internal clamping for inductive load and current limit self-protection, through and control serial interface and dedicated enable pin, rated output at 150 mA, regulated output for internal voltage monitoring
Other general logicSN74HC00: Four-way 2-input positive NAND gate
Standard linear deviceTS12A4514: Low Voltage, Low On-Resistance SPST CMOS Analog Switch
TRS232E: Dual RS-232 Driver/Receiver with IEC61000-4-2 Protection
TPD2E007: 2-Channel ESD Protection Array for AC Signal Data Interface
All in all, a microwave oven is a device that converts electrical energy into microwaves, but the internals need to be converted into the most efficient, safest, and most stable microwaves through the functional combination of various devices to achieve the conditions set by people...
The future development of microwave ovens is bound to go in the direction of intelligence, automatically detect the highest nutrition of things, and automatically turn off the fire, do not have to worry about food overheating or damage... think of this is how you want to be willful, how to be willful...
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