Induction cooker has gradually developed into one of the necessary products for almost every modern family, and its convenient advantage is that most users are able to achieve the purpose of use through a series of simple operations. And because induction cookers are subject to fewer restrictions and can be moved at any time, so the market sales of related products are very good. But as a consumer, in order to ensure the safety of use, and as far as possible to use the function of induction cooker, it is necessary to understand several aspects of information related to it, such as the induction cooker high-power tube test method mentioned below, etc..
A, induction cooker high-power tube test how
IGBT good or bad determination (tube feet down, tube front to themselves, from the left is the gate, collector, emitter):
The normal situation: GC|, GE forward and reverse are not working, only the CE positive conductor (the reverse of the pair is also not working).
If the measured resistance between the three pins of the IGBT tube are very small, it means that the tube has been damaged by breakdown; if the measured resistance between the three pins of the IGBT tube are infinity, it means that the tube has been damaged by open circuit. The actual maintenance of IGBT tube is mostly breakdown damage.
Second, the induction cooker repeatedly burned power tube eight reasons
Reason one: 0.3uf/1200v resonant capacitor, 5uf/400v filter damage or insufficient capacity.
In the induction cooker, if the 0.3uf resonant capacitor, 5uf filter capacitor capacity becomes small, failure or bad characteristics, will lead to high frequency of the LC oscillation circuit of the induction cooker, thus causing damage to the IGBT tube, after checking the other circuit is not abnormal, we must replace the two capacitors together.
Cause 2: IGBT tube excitation circuit is abnormal
The pulse signal output from the oscillation circuit can not directly control the IGBT tube saturation, conduction and cut-off, but must be completed through the pulse signal amplification of the excitation circuit, if the excitation circuit has problems, the high voltage will be added to the G pole of the IGBT tube, resulting in the instantaneous breakdown of the IGBT tube, commonly for the driver tube S8050, S8550 with damage.
Reason 3: abnormal synchronization circuit
The main role of the synchronization circuit in the induction cooker is to ensure that the front of the switch pulse added to the G pole of the IGBT tube is synchronized with the trailing edge of the VCE pulse on the IGBT tube, when the synchronization circuit works abnormally, resulting in instant breakdown damage to the IGBT tube.
Cause 4: 18V working voltage is abnormal
In the induction cooker, when the 18V working voltage is abnormal, the IGBT tube excitation circuit, fan cooling system and LM339 will work abnormally, resulting in instant damage to the IGBT tube on power.
Reason 5: abnormal heat sink system
Induction cooker works in high current state, its heat generation is large, if the heat sink system failure will lead to IGBT tube overheating damage.
Cause 6: Abnormal microcontroller
Cause six: abnormal microcontroller
The internal abnormality of the microcontroller will burn the IGBT tube due to abnormal working frequency Cause 7: Abnormal VCE detection circuit
The VCE detection circuit divides the pulse voltage on the collector of the IGBT tube through a resistor and samples it to obtain its sampling voltage, and the information of this voltage change is sent to the CPU, which monitors the change of this voltage and issues various corresponding instructions. When the VCE detection circuit is abnormal, the VCE pulse amplitude value exceeds the limit value of the IGBT, which leads to the damage of the IGBT Cause 8: User pot deformation or pot bottom Unevenness
The eddy current generated at the bottom of the pot cannot evenly heat the deformed pot, thus the temperature sensor at the bottom of the pot is detected out of order, and the CPU continues to heat because it cannot detect the abnormal temperature, resulting in damage to the IGBT.
Third, the induction cooker power tube burned how much it costs to repair
Induction power tube burned inevitable bridge stack, 18V voltage regulator, drive the tube are difficult to protect, only the cost of accessories cost 15 yuan, so, usually lead to power will jump the air switch induction stove repair 70 yuan is the market price
About the induction stove high-power tube, it is the normal use of induction cookers must have one of the important parts of the process, it can even be said that it is to a certain extent to protect the user’s use of demand and safety performance. The above information for you to collate includes induction stove high-power tube detection method, so that users can determine the cause of the failure, in addition to the price of induction stove high-power tube examples and induction stove repeatedly burn power tube eight reasons, these information from a professional point of view is very important to consumers.
