With the development of modern science and technology, a variety of high-tech applications to people's daily lives. Induction cooker is one of the products of the modern kitchen revolution. Induction cooker to rise quickly, small size, high thermal efficiency, beautiful and versatile as a multi-functional stove home life, and also has the characteristics of energy saving and environmental protection, so it can win the hearts and minds of people. At the same time also has the characteristics of energy saving and environmental protection, so it can win the favor of many people. Often use induction cooker friends may want to know, induction heating principle is how, can make it has such a big attraction? This article will share with you the heating principle of induction cooker.

Induction cooker is the application of electromagnetic induction principle of food heating. The surface of the induction cooker is a heat-resistant ceramic plate, the alternating current through the ceramic plate below the electromagnetic coil generates a magnetic field, the magnetic field within the magnetic lines of force through the bottom of the iron pots, stainless steel pots and pans, generating eddy currents, so that the bottom of the pots and pans to heat up quickly, so as to achieve the purpose of heating the food. (As shown below)

The working process is as follows: AC voltage through the rectifier converted to DC, and high-frequency power conversion device so that DC into more than audio high-frequency alternating current, high-frequency alternating current added to the flat hollow spiral induction heating coils, which produces a high-frequency alternating magnetic field. Its magnetic lines of force penetrate the ceramic plate of the cooktop and act on the metal pot. In the cooking pot body due to electromagnetic induction there is a strong eddy current generated. The eddy current overcomes the internal resistance of the pan body flow to complete the conversion of electrical energy to thermal energy, the resulting Joule heat is the heat source of cooking.

Induction cooker common failure and maintenance:

Induction cooker roughly has three kinds of common failure:

1?burst - burn insurance and IGBT. The specific performance is no response to power on, the whole machine does not work. We dismantle the machine, we will find that the insurance burned out, and burst very badly, the insurance of the glass wall are burst black. We further check, we will find that in the big radiator under the IGBT also breakdown, sometimes even with the rectifier bridge also burned, but the rectifier bridge than the IGBT is much more sturdy, in general, only burn IGBT.

Encountering this situation, we do not rush to replace the parts of the test machine. Also check for other bad parts. I encountered this situation, the circuit of all the large value of the large body type of resistance are measured once, and drive the IGBT of the two transistors (8050, 8550) should also be measured, and then take a look at the 300V filter capacitor and 0.33uF resonant capacitor there is no bulging. If these are okay, in addition to IGBT all the bad parts of all new. At this time, power on the test machine, measure +5V, +15V or +18V, IGBT B pole 0V is not normal. Only these voltages are normal, you can install the IGBT. this can rule out most of the explosion fault.

2?The machine does not respond, but there is no explosion

Trial, the machine does not work, dismantle the induction cooker, found that the fuse is intact.

This is generally the case of induction cooker power conversion chip burned out, it generally produces 18V voltage, and then through the 7805 into a +5V voltage for the CPU to work, no +5V, the CPU does not work, of course, the whole machine does not work. Induction cooker in such chips are generally used viper12a, viper22a, thx203h. Measure the periphery of the power conversion chip to see if there is a collateral damage to the small devices, if so, replace it.

3 can power on, but display fault code

This type of failure to first figure out the meaning of the code, and then purposeful maintenance. There are a lot of induction cooker fault codes on the internet, we can make full use of them. This kind of failure is generally those large resistance value big figure of the resistor value, can be measured one by one, there is a change in the value of the replacement. At the same time to check the transformer, 300v/5uF capacitor, thermistor and the only one potentiometer in the induction cooker. As long as these are checked, these types of faults can usually be eliminated as well. A few may also be caused by damage to the LM339, which can be verified by substitution.

4?Functions are misaligned, and some do not respond to pressing the on button.

This type of failure is best repaired, generally bad keys, or key board dirty leakage, change the key or clean the key board can be solved this type of problem.

5?CPU bad

This kind of failure is generally not good, it is best not to waste time, because this kind of CPU is very difficult to get hold of.

6?No heating or intermittent heating.

This type of failure is not very good repair, temperature detection resistor, synchronous oscillation circuit, IGBT driver, IGBT?C pole high-voltage protection circuit, current detection circuit, PWM modulation circuit, CPU circuit may be related to this type of failure. Repairing this type of failure is to test our patience.

Induction cooker is one of the daily kitchen appliances necessary, no matter how the induction cooker in the use of the process will encounter some small problems, understand the internal heating principle of the induction cooker, when the induction cooker is a small problem, they will understand some of the problems where to pull.