Electromagnetic stoves are kitchen appliances that are common in the lives of people in their homes and are often popular with housewives because of their convenient characteristics. In the course of their use, problems with electromagnetic furnace failure are inevitable, so what are the methods of maintenance of the electromagnetic furnace? Let's see below。
I. Maintenance of electromagnetic furnaces
The electromagnetic furnace has about six common failures:
Explosive - fire insurance and igbt。
This is reflected in the failure of electricity to react and the non-working of the whole machine. We unplugged the machine, and we found out that the insurance burned, and it exploded so badly that it was all black on the glass wall. Further examination will show that the igbt under that big radiator has also broken through, and sometimes even a whole stream bridge has been burned, but the whole bridge is much stronger than igbt and normally only igbt。
In this case, we should not rush to replace the spare parts test machine. We need to find out if there are any other bad things. In this case, i measured all the major resistance broadly in the circuits, and the two triodes (8050 8550) driving igbt also measured to see if there were drums for 300v filtering and 0. 33uf resonating. If that's all right, replace all the bad parts except igbt. At this point, it is normal to test b-ovs for +5v, +15v or +18v, igbt. Only when these voltages are normal can igbt be installed. This will eliminate most of the blast failure。
2 unrespondable, but not explosive
The test machine, the whole machine, was not working, the electromagnetic furnace was removed and the fuse was found to be intact。
This is usually the case when the electric transformer chip of the electromagnetic furnace is burned, which generally generates 18v voltage, then becomes +5v voltage by 7805 for cpu work, without +5v, with cpu not working, of course, the whole machine is not working. In electromagnetic furnaces, such chips are generally used as viper12a, viper22a, thx203h etc. The power transformer chip is measured on the outer edge of the chip to see if there is a small device with collateral damage, and if so, replace it。
Three, turn it on
Such failures require a clear understanding of the meaning of the code before purposeful maintenance. There's a lot of code down the electromagnetic furnace on the internet, and we can use it. Such malfunctions are typically electrically resistant transformations of high-probability bodies, which can be measured in one place and replaced by variables. At the same time, we need to check the single level of the intersensor, 300v/5uf capacitor, heat-sensitive electrical resistance and electromagnetic furnaces. As long as these locations are identified, such failures can generally be eliminated. The few may also have been caused by damage caused by lm339 and may be verified by proxy。
4 fragmented, some buttons not responding。
This type of failure is best fixed, usually when the key is broken or when the keyboard is dirty, or when the key is pressed or the keyboard is cleaned。
5 cpu bad
Such failures are generally not repairable and it is best not to waste time, as such cpus are difficult to reach。
6 unheated or intermittent heating。
These malfunctions are difficult to repair, temperature detection of electrical resistance, simultaneous oscillation circuits, igbt-driven, igbt c-high voltage protection circuits, current detection circuits, pwm-modified circuits, and cpu circuits may all be associated with such failure. Fixing such failures is a test of our patience。
Ii. The working principles of the electromagnetic furnace
The electromagnetic furnaces use magnetic field induction vortex heating, using currents to produce magnetic fields through the wire, and when magnetic forces in the magnetic field pass through the base of an iron-containing pan, they produce numerous small vortex streams that allow the pot itself to heat itself at high speed and then heat the food inside the pan. The electromagnetic waves produced during the work of the electromagnetic furnace are fully absorbed by the iron-containing pans on the screens and ceilings at the bottom of the wire, do not leak and are absolutely harmless to human health。
In operational electromagnetic furnaces, boilers generally require iron-magnetic materials such as iron, stainless steel and ceramic pans. Because the pot is subject to the magnetic line cutting of the electromagnetic furnace, the bottom is required to be flat. There are also certain requirements for the size of the bottom, as it affects the strength and weakness of the magnetic line, and hence the sampling of internal circuits in the electromagnetic furnace. For the time being, as long as the above-mentioned requirements for boilers are met, most of the pans of the electromagnetic furnaces are universal。
