Working principle of induction cooker
1, the induction cooker uses the principle of electromagnetic induction to heat food. The surface of the induction cooker is a heat-resistant ceramic plate. Alternating current generates a magnetic field through a coil under a ceramic plate. When the magnetic lines of force in the magnetic field pass through the bottom of an iron pan, a stainless steel pot and the like. , produce vortex, so that the bottom of the pot quickly heats up, thus achieving the purpose of heating food.
2. Its working process is: the current and voltage are converted into direct current through the rectifier, and then converted into high-frequency alternating current exceeding audio frequency through the high-frequency power conversion device, and the high-frequency alternating current is added to the flat hollow spiral induction heating coil, thus generating a high-frequency alternating magnetic field. Its magnetic field lines penetrate the ceramic platen of the furnace and act on the metal pot. Due to electromagnetic induction, there is a strong eddy current in the pot. When the vortex flows against the internal resistance of the pot, the conversion from electric energy to heat energy is completed, and the generated Joule heat is the heat source of cooking.
3. The induction cooker is an advanced electronic cooker for cooking food in modern families, which uses the principle of electromagnetic induction for heating. It is very convenient to use and can be used for cooking operations such as boiling, frying, frying, steaming and frying. Features: high efficiency, small size, light weight, low noise, energy saving, no environmental pollution, safety and hygiene, uniform heating during cooking, and good preservation of color, fragrance, taste and nutritional components of food. It is an indispensable new type electric cooker to realize kitchen modernization. Generally, the power of electromagnetic cooker is about 700-1800 w. ..
What if the induction cooker doesn't heat?
There are many reasons why the induction cooker does not heat up:
1. External reasons: If the external grid voltage is higher or lower than the working voltage range of the induction cooker, the internal protection mechanism of the induction cooker will be forced to cut off power and heat. If the internal temperature of the induction cooker is too high, the start of the temperature alarm mechanism will also forcibly turn off the heating function. There is also a pot to prevent dry burning, and the induction cooker will also be forced to cut off power.
Second, external reasons: including temperature sensor open circuit, short circuit protection, IGBT tube overvoltage protection and IGBT overcurrent protection. After these problems appear, there is no need to worry. It will be enough to restart after a while.
Maintenance method and fault analysis of induction cooker
Phenomenon 1, boot burn insurance.
① First disconnect the terminal pin of the electromagnetic coil, replace it with a fuse tube, and measure the voltage across the capacitor C 102. Generally, the DC output voltage of bridge rectifier is 220 V-300 V If there is no voltage or the fuse keeps blowing, it is judged that the bridge rectifier block is broken.
Cause analysis: If the rectifier bridge breaks down, 220V AC will be directly short-circuited.
② There is voltage at both ends of C102. It is judged that IGBT is damaged, and the fault is eliminated after replacement.
Analysis reason: There is voltage across C 102, which indicates that the DC output of bridge rectifier is normal. If two output pins of IGBT are punctured, it is equivalent to DC short circuit.
③ The bridge and IGBT are not broken, but the fuse is still burned, and the IA83 16S integrated block is broken, and the fault will be eliminated after replacement.
Analysis reason: The output pulse angle of TA83 16S is too large, which leads to IGBT overload.
Phenomenon 2, the fan does not work
① Unplug the fan strip and check whether there is 12V power supply. If there is, it means that the fan motor is broken.
Cause analysis: the power supply is normal, usually the fan motor is short-circuited or open-circuited.
② ② There is no 12V voltage on the fan patch panel, and the emitter of the driving transistor Q703 is broken down. Replace Q703 to eliminate the fault.
Analysis: Q703 is not broken, and the integrated block IC4 is broken. Replace it with the integrated block IC4 and troubleshoot.
③ The fan motor and Q703 are not broken, but the integrated circuit block IC4 is broken. Replace with IC4 integrated block, and solve the problem.
Analysis reason: If the seventh pin of IC block IC4 has no high-level output, then the emitter of Q703 has no bias voltage, and the integrated electrode of Q703 is still unable to conduct, and the power supply is in an off state.
Phenomenon 3. Start-up operation shows normal, but no heating.
① Measure whether there is a voltage of 18V at the third pin of TA83 16S. If there is no voltage, check whether Q20 1 and ZD20 1 are broken down. If there is any fault, correct the fault after replacement.
Analysis reason: If there is no voltage of 18V at the third pin of TA83 16S, the fault point should be the series voltage stabilizing circuit of the power supply, so the basic components constituting the series voltage stabilizing circuit must be checked first.
② The third pin voltage of ta 83 16S is 18V. After replacement, the fault should be solved in IC3 integrated block TA8316s.
Reason for analysis: The LED board displays normally and works normally, indicating that the computer control circuit is basically normal and the fuse is not blown, indicating that the high-voltage board is basically normal, but the IGBT cannot be turned on because there is no pulse output to the IGBT control electrode of TA83 16S.
Phenomenon 4. After the machine is turned on, the panel light flashes all the time.
(1) The crystal vibrates badly. After replacement, troubleshoot.
Analysis reason: the crystal oscillator is broken, resulting in no clock frequency input to the CPU, which makes the whole IC 1 CPU out of control.
Harm of induction cooker
1. Electromagnetic radiation is one of the main causes of cardiovascular disease, diabetes and cancer mutation;
2. Electromagnetic radiation will directly harm human reproductive system, nervous system and immune system;
3. Electromagnetic radiation is one of the inducing factors of abortion, infertility and teratogenesis in pregnant women.
4. Excessive electromagnetic radiation directly affects the development of children's body tissues and bones, leading to the decline of vision and liver hematopoietic function, and in severe cases, it can lead to retinal detachment;
5. Electromagnetic radiation can make male sexual function decline and female endocrine disorder.
Harmful reasons of induction cooker:
In fact, the harm of induction cooker mainly comes from electromagnetic radiation. Although the radiation frequency of induction cooker is only one sixtieth of that of mobile phone signal, its radiation power is much larger than that of mobile phone signal. The radiation power mainly depends on the electromagnetic wave leakage value of the induction cooker, and the greater the leakage, the greater the harm to users! Long-term or long-term use will have a greater negative impact on human health.
Methods to prevent the harm of induction cooker;
1. To prevent the harm of induction cookers, we must first start with the purchase. When buying induction cookers, you must choose induction cookers and pots from regular brands and manufacturers;
2. When buying an induction cooker, ask the seller for the test report of electromagnetic induction intensity, and choose an induction cooker with low field strength;
3. Try to avoid being too close to the induction cooker when using;
4. If possible, buy anti-electromagnetic aprons and anti-electromagnetic gloves made of stainless steel fiber, and make details;
5. Do a good job in the maintenance of induction cooker, remove oil and dirt in time, and avoid electromagnetic wave leakage to the greatest extent.