The induction cooker cannot sense the pot, that is, the pot is not inspected 10

The pot could not be detected, and there was an alarm sound.

Fault analysis: There are many reasons for this fault, including synchronization circuit, surge protection circuit, pot detector circuit, drive circuit, IGBT high voltage protection circuit, and PWM signal circuit.

1) Synchronous circuit failure.

Inspection steps: In the case of standby coil reel, use a multimeter to measure the working voltage of 8 pins and 9 pins of U1-LM339, (8 pins are, 9 pins are, if the voltage is abnormal, please check R18, R1, R4, R239, C214, C209, D213, replace the components in question, and the fault can be eliminated.) If the voltage of the above 2 pins is normal, then we measure whether the voltage of pin 14 of U1--LM339 is high, and the voltage value is. If it is low, it means that U1 is damaged (troubleshoot the PWM signal circuit here).

If it is high, please use a wire to ground pin 9, and then measure whether the voltage of pin 14 is low, if it is still high, it means that U1--LM339 has been damaged, replace it with U201--LM339 of the same model and specification, power on test machine is normal, troubleshooting.

2) Surge protection circuit failure.

Fault analysis: surge protection is generally a violent pulse in the power supply in only a few millionths of a second, in order to protect the IGBT from damage, the protection circuit will output a low level to stop the IGBT from working, and the circuit will automatically return to normal after the surge.

Check steps: First, measure whether the 13 pins of U2--LM339 are high, if it is high, it means that the surge protection circuit is not working. If it is low, it means that the surge protection circuit has been activated (this pin is connected to the output pin of the IGBT high voltage protection circuit, which is analyzed here to troubleshoot the IGBT high voltage protection circuit).

We then measure whether the voltage of the 11 pins of U2 is 3V, and whether the voltage of the 10 pins is lower than the voltage of the 11 pins (the voltage of the 10 pins is, if so, it means that the voltage of the U2-LM339 has been damaged, and the fault can be eliminated after replacement. If the voltage of pin 6 and 7 of U202 is abnormal, please check whether R5, C22, R6, D206, D207, C206, C207, C217, R218, R223 are normal, replace the abnormal components, and the fault can be eliminated.

If the voltage of pin 14 of U2 is only measured, and the voltage of pin 11 is greater than the voltage of pin 10, we measure whether the voltage of pin 1 of the main IC is low, if so, it means that the main IC has been damaged. Troubleshooting can be done after replacing the IC with a new one.

If the pot is not checked during normal use, 90% of it is 300V filter capacitor 5UF is bad, it is impossible that the chip is broken, and the probability of the integrated block being broken is almost zero.

Other resistors, capacitive diodes, and high-frequency circuits should also be checked. It's best to find a professional master to repair it, and some repair shops are very shady!!

The master must be hacking you.,90% of the pot is 300V filter capacitor 5uf bad if you don't check the pot during normal use.,It can't be that the chip is broken.,The probability of the integrated block being broken is almost zero.。。。

For induction cookers that do not inspect the pot, I classify the common faults into the following three categories:

v. The main voltage is too low due to the poor filter capacitor, and the voltage detected by the synchronous circuit is abnormal.

2. The high-power resistance of the synchronous circuit deteriorates or the open circuit causes the detection circuit to be abnormal.

3. The PWM pulse signal is abnormal and the pot is not checked. (The method of checking the PWM pulse is simple, and it has been introduced on the forum, that is, find a small transformer, connect a light-emitting diode on the primary, put it on the heating plate of the induction cooker and turn it on, the light-emitting diode has a flash to indicate that the PWM pulse is normal, and if there is no response, it is not normal).

1. Find the base of the two drive tubes first, and then see which foot of LM339 is connected to it.

2. According to the internal block diagram of LM339, you can see the other two pins related to it, one of these two pins must be to the MCU, and the foot to the MCU is.

The input pin of the PWM pulse signal.

3. It is simple to find out the problem after the foot, and the next step is to disconnect the diode first.

After that, the PWM pulse signal output by the MCU is measured to determine the fault location. After this, there is no need to talk about other specific testing steps, and I believe that friends who have a little basic knowledge know how to check.

4. There is another key point, that is, (1 and 5 pins), 1 pin is related to the pin, if the voltage of the pin changes, then the voltage of the 1 pin will also change, PWM

The pulse signal is bound to be affected. The most common problem is that the poor capacitance (2A222J) between the feet causes the pot to be unchecked.

Induction cooker does not check the pot:

Check the chip components resistor, capacitor. Is it normal?

Is the pot detection voltage of the secondary output of the transformer normal?

Is 300V voltage normal?

Is the main resonant capacitance normal?

Is the high-voltage step-down current-limiting resistor normal?

Is the microprocessor clock oscillating circuit normal?

External Factor 1 The voltage is not enough If possible, use the AC voltmeter to check whether the socket voltage is 220V when opening the induction cooker. 2 The bottom area of the pot is too small or the pot is uneven Internal Factor 1: 275V 5UF Capacitance is bad2 Comparator LM339 Partial fault or LM339 The surrounding resistance is bad Rusty broken leg 3 Current detection Current transformer is bad Or the detection and transmission circuit is bad Follow-up question: Only one just pot is put on the inspection pot, the others are not checked, and the pot is not checked when it is put on the cautery. Put it on another stove so that it can be Answer:

Only iron pots can be detected Other materials Stainless steel (magnets do not adsorb) Aluminum pots and casserole pots cannot be used Follow-up question: The pot is fine, it is good to put it on other stoves, I only have a steel basin to put it on the good Answer: Please look at the analysis, this is the current detection current transformer is bad or the detection and transmission circuit is bad This part is the problem Generally, the transformer is bad A small transformer is a small transformer Detection and transmission side That is, the secondary coil is wound with a lot of copper wires Because it may be after your induction cooker gets water or is wet There is a short circuit in the copper coil, resulting in a weak detection signal, just like you put a cauldron, but the induction cooker detects a large cup of pot, of course, it can't be detected, you put a cauldron, the starting current is large, the signal will be enhanced, and the detection threshold is reached, of course, you can use it For this reason, if you don't have the conditions to repair it yourself, it is recommended to send it for repair, and the maintenance master will help you solve it.

The reason for the alarm of the induction cooker does not check the pot, the bottom of the wire reel is detected, and the resistance IGBT temperature detection resistance is damaged.

Indicates that this pot is not suitable for induction cookers.

It could be due to the following reasons:

1.The bottom of the pot is uneven or not suitable for the induction cooker: The induction cooker can only sense the sharp bridge pot made of iron or magnetic materials, and if the bottom of the pot is uneven or does not have the magnetism of the spine base, the pot cannot be sensed.

2.Induction cooker failure: A failure of the induction coil or circuit of the induction cooker will also cause the pot to be unable to sense.

3.The bottom of the pot is too dirty: The bottom of the pot is too dirty or has oil stains, which will also affect the induction effect of the induction cooker.

Workaround:1Replace the pot suitable for the induction cooker to ensure that the bottom of the pot is flat and magnetic.

2.Check if the induction cooker is faulty and needs to be repaired or replaced.

3.Wash the bottom of the pot and keep it clean.

What is the failure of the induction cooker, these are the first problems we will consider when the induction cooker has this problem, since you have a problem and want to know, then we will introduce it to the Lu family for the big slowInduction cooker does not check the pot:What is the fault, and what are the brands of induction cooker, I hope the following introduction, can be helpful to friends.

1. What are the faults of induction cooker without checking the pot?

1. The detection resistance of the bottom of the wire coil and the temperature detection resistance of the IGBT of the induction cooker are damaged.

2. A solder spot welding at the bottom of the motherboard is virtual.

v. The main voltage is too low due to the poor filter capacitor, and the voltage detected by the synchronous circuit is abnormal.

4. If the high-power resistance of the synchronous circuit is damaged or deteriorated, it will also lead to abnormal detection circuits.

5. The pot is not checked because of the abnormal PWM pulse signal. Focus on checking the synchronous circuit (LM339's peripheral components, such as: tapering capacitor (2A222J)), PWM drive pulse loop R12 and IGBT control pole, be sure to pay attention to C9, C10.

Second, what are the brands of induction cookers?

1. Since its establishment in 1968, Midea is a large-scale comprehensive modern enterprise group mainly engaged in the home appliance industry and involved in logistics and other fields, with three listed companies and four major industrial groups, and is the largest home appliance production base in China.

Joyoung Co., Ltd., which was established in the year, is a modern enterprise focusing on the research and development, production and sales of healthy diet appliances. The company has always been healthy, stable and rapid development as the company's philosophy, in Jinan, Hangzhou, Suzhou and other places to build a number of production, R & D bases, products cover many provinces, municipalities and autonomous regions across the country, and the products are liked by many foreign friends.

3. Aiting Electric is the earliest professional manufacturer of induction cooker in China, which began to research and develop induction cookers in 1998, and has developed into one of the world's largest induction cooker production bases with industry-leading technology, specialization and differentiated business philosophy, with an annual production capacity of more than 6 million units; It is a very popular induction cooker manufacturer in China.

4. Supor is China's largest cookware manufacturer, its Supor induction cooker is a continuation of the company's consistent development characteristics, in addition to advanced technical support, there are also very perfect functional characteristics, Supor induction cooker is made of simple panel design, so that the operation of the induction cooker is simpler, the unique 2 seconds of fire power quick adjustment, high efficiency and energy saving, so that people like Supor induction cooker more.

What is the failure of the induction cooker, what are the brands of the induction cooker, it is introduced to you here, I believe that after reading the article on the Zen, you must have understood what the failure of the induction cooker is to check the pot.

For induction cookers that do not inspect the pot, common faults:

v The main voltage is too low due to the poor filter capacitor, and the voltage detected by the synchronous circuit is abnormal.

2. The high-power resistance of the synchronous circuit deteriorates or the open circuit leads to the abnormal detection of sensitive vertical defects.

3. The PWM pulse signal is abnormal and the pot is not checked. Find a small transformer, connect a light-emitting diode on the primary level, put it on the heating plate of the induction cooker and turn it on, the light-emitting diode has a flash to indicate that the PWM pulse is normal, and the non-response fiber is not normal.

First see if the pot you put on is made of iron, if the pot you use is okay (that is, the kind that can be sucked by silver tung with a magnet), and the area at the bottom of the pot is large enough, that is, there is a problem with the induction cooker's inspection circuit, it is recommended to contact the maintenance staff to help you check it.

The principle of the induction cooker is the phenomenon of electromagnetic induction, that is, the alternating current is used to generate an alternating magnetic field that changes the direction through the coil, and a vortex current will appear inside the conductor in the alternating magnetic field, which is caused by the movement of the carriers in the conductor (the electrons in the pot are not iron atoms) driven by the vortex electric field; The Joule heating effect of the vortex current heats up the conductor and thus heats up.

The material of the pot must be iron or alloy steel, with its high permeability to strengthen the magnetic inductance, thereby greatly enhancing the vortex electric field and eddy current thermal power, other materials of cookware due to the material resistivity is too large or too small, will cause the induction cooker load abnormal and start automatic protection, can not work normally.

If the induction cooker does not recognize the pot, you can see if the pot used is wrong, and replace the pot with an iron or other magnetic pot. If it still doesn't work, it may be that something like an induction cooker, resistor, voltage comparator, or microprocessor is malfunctioning, so it's best to send it directly to a repair shop for repair.

Induction cooker is now an electrical appliance that almost every household has, but sometimes it will have some faults, such as no way to detect that there is a pot on the stove, which means that there is a fault in some aspect and cannot be used normally, and it needs to be investigated and dealt with in time.

The induction cooker can't recognize the pot may be because there is a problem with the pot used, because only the iron type of magnetic pot can be used on the electric or magnetic cooker, if you use other pots and pans, it will not be recognized, at this time we can change the pot to try it first.

It is also possible that there is damage to the inside of the induction cooker, resulting in the induction cooker not being recognized, you can check whether the resistance, voltage comparator, microprocessor and other things in the induction cooker are damaged, in this case, it is best to send the induction cooker directly to the repair shop for repair, or buy a new induction cooker.