What is the white stuff between the induction cooktop and the hearth

Thermal grease. Its function is to protect the pot from over-temperature in the case of dry boiling, and prevent the stove surface from being burned dry. In order for the sensor to quickly sense the temperature of the microcrystalline plate, a thermistor is used.

It is coated with thermal grease to reduce thermal resistance. Function.

It is a silicon ester, which should be replaced when it dries, and it is purchased for home appliance maintenance or electrical appliance city, like toothpaste. Affects the accuracy of the temperature probe in the center.

The white paste in the middle of the induction cooker coil is a thermal grease, which has a thermal conductive effect. When the induction cooker works, the high temperature at the bottom of the pot will increase the temperature of the panel, the temperature of the panel is transmitted to the thermistor in the middle of the coil through the thermal grease, the resistance value of the thermistor changes due to the temperature change, the thermistor is a negative temperature coefficient, the higher the temperature, the smaller the resistance value, when the resistance value of the thermistor is small to a certain value, the induction cooker will automatically shut down, so as to protect the induction cooker from being damaged by too high temperature.

The main thermal sensor is a glass encapsulated thermistor, the normal resistance value is 100 200K, the resistance value decreases with the increase of temperature, this resistance is the pot temperature detection resistance, his role is to detect the furnace temperature, over-temperature protection. He opens the circuit or the resistance becomes larger, which can also cause unchecking. There are two types of resistance:

One is the early product, his resistance is 0 ohms, and the current products are generally 100-130k ohmsNow the cold has some stoves may not check the phenomenon of the pot, if you switch to warm water or have a certain heat of the pot can be turned on, generally because of the change of the temperature of the pot detection resistance resistance, you can measure whether his resistance is normal, such as more than 130k ohm can be connected in parallel at both ends of a 470k ohm resistance, you can solve the problem of not checking the pot. In case of emergency, a 10k resistor can be used instead of a thermistor to put the induction cooker into working condition.

If you can't heat it, there will often be an error**, with a small knowledge of the pot inspection circuit: The pot inspection is divided into two types: current pot detection (commonly used by most domestic machines) and high-voltage pulse inspection pot (commonly used by Shang Pengtang). The current detector is to detect the working current through the current transformer (that is, a small transformer on the board, and its primary is very thick) to detect the working current, and the current reaches a certain value as a pot.

Here is a little experience for you: after repairing the motherboard, especially after replacing the IGBT, in order to detect whether the whole machine is working normally and avoid damaging the expensive IGBT again, you can access the 100W-200W bulb at the coil position, and connect the output end of the transformer secondary through the diode rectification to the 5V end through a 1K resistor, so as to simulate the state of having a pot, select different gears or temperatures to see if the brightness of the bulb changes to determine whether the whole machine is working normally, if the bulb is always on, it proves that the IGBT is in the normally on state, It also needs to be carefully overhauled. The high-pressure pulse detector is to measure the number of C-pole pulses of the IGBT to determine whether it is in an under-damped (no-load) state, if it is greater than 9, it is considered to be under-damped (no pot), and less than 5 is regarded as having a pot.

Some models are available in both. As for the drive part, this is not clear in one or two sentences, but most of the domestic ones are composed of 8050 and 8550 columns, and individual TA8316 integrated blocks, which is not difficult to understand.

Brand model: Supor induction cooker.

System: C22-IH68E8

The white thing in the middle of the induction cooker is thermally conductive silicon, which transmits the temperature generated on the panel to the thermostat, so that it can be shut down in time when it overheats. If the thermal grease is gone, it cannot automatically stop when the temperature is too high, which is easy to cause damage to the parts, and in serious cases, it may cause fire.

Thermal grease is commonly known as heat dissipation paste, thermal grease is made of silicone as the main raw material of Chang brother, adding materials with excellent heat resistance and thermal conductivity, and is used for thermal conductivity and heat dissipation of electronic components such as power amplifiers, transistors, electron tubes, CPUs, etc., so as to ensure the stability of the electrical performance of electronic instruments and meters. The working temperature of thermal grease is generally not more than 200, the high temperature can reach 300 shots, and the low temperature is generally about -60.

White thermally conductive silica gel, ferromagnetic metal utensils can be heated by alternating current magnetic field, only ferromagnetic metal utensils have a high enough energy conversion efficiency, and the heat and temperature generated are enough for cooking and eating.

Because the magnetic permeability of ferromagnetic metal utensils is higher and has a shallow skin depth, because of the skin effect under AC, the cross-cutting area through which high-frequency current flows can be reduced, and the equivalent resistance is larger, which is conducive to relying on eddy current heating. If non-ferromagnetic metal utensils are used, the efficiency will be low enough to be used for cooking.

Summary. The white paste is thermal grease, there is a temperature sensor in the middle, the thermal grease can transmit the temperature of the tempered glass (ceramic) plate to the temperature sensor more effectively, and it can be used without thermal grease, but once it is overheated, it may not be able to alarm in time. ”

What is the white thing in the center of the induction cooker coil, and is it useless without white things?

The white paste-like liquid is thermal grease, there is a temperature sensor in the middle, the thermal grease can transmit the temperature of the tempered glass (ceramic) plate to the temperature sensor more effectively, and the silicone grease can also be used without thermal conductive leather car, but once the temperature is over, it may not be able to alarm in time. ”

I'm sorry I don't understand, but can you elaborate on that?

The white paste-like liquid is thermal grease, there is a temperature sensor in the middle, the thermal grease can transmit the temperature of the tempered glass (ceramic) plate to the temperature sensor more effectively, and the silicone grease can also be used without thermal conductive leather car, but once the temperature is over, it may not be able to alarm in time. ”