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Induction cooker 8-pin chip is generally the power management chip of the induction cooker power supply circuit, the internal circuit includes power start, oscillation, sampling, voltage regulation, voltage regulation output, overcurrent protection and other links, in recent years because of the low design cost of the power chip, wide working voltage range, small size, mature technology, is widely used in the field of small household appliances, common chips such as: OB2226AP, SM7028, VPIER12A, FSD200, etc., 8-pin chip without output voltage common reasons are:
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1, chip peripheral circuit problems. The normal operation of the power chip needs to first give the chip a starting voltage, this voltage is generally 220V AC half wave or full wave rectification and then a few hundred thousand ohm starting resistance supply to the starting circuit end, the common fault is that the starting resistance is open resulting in no starting voltage chip no output, voltage regulation end peripheral components should also be carefully checked, this circuit peripheral components are relatively few. It is relatively easy to check, replace the detected bad components, such as the chip is a good problem to solve;
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2, the power chip is damaged, the damage causes are internal reasons and external reasons. Internal reasons include the quality of the chip itself, the parameter change damage caused by poor heat dissipation, (the chip itself leads to a large proportion of no output voltage maintenance) these two cases can only be replaced by the same model of the chip, such as the same model can be replaced by checking the information. External causes Common overcurrent damage caused by short circuit at the load end: Although there is an overcurrent short circuit protection circuit inside the chip, but the load end of the short circuit instantaneous large current damage chip sometimes can not be avoided, this situation needs to check the 18V voltage filter circuit, cooling fan, IGBT drive circuit is damaged, find the corresponding cause, replace the damaged components and then replace the chip can eliminate the fault.