Switch Mode Power Supply (SMPS) will cause the base of the switch tube to fail to get the switching pulse and intermittent operation due to the short circuit of the load, the failure of the vibration circuit itself and the loss of control of the protection circuit, which makes it difficult to locate the shortcomings of SMPS. The difficulty of the repair operation is improper, and the improper method will expand the shortcomings, constituting the phenomenon of continuous burning of the switch pipe, etc., so the circuit should be isolated through the inspection of SMPS, and the intermittent defect location should be checked step by step.
Independent power supply, remove protection, check the shortcomings caused by the loadSMPS and linear regulated power supply are different, no-load situation is easy to break down the switch, therefore, SMPS damage intermittent independent repair # disconnect the load and protection circuit all together# must be on the main load power supply group power supply with a false load. The selection of false load according to the power supply power and test conditions, can be used incandescent lamp or soldering core, someone has written that the incandescent lamp as a fake load due to the cold state resistance is very small, the switch tube starting current is large, easy to constitute the switch tube damage A short test and theory support, the test and theory prove that SMPS has a wide range of voltage regulation, there will be no damage to the switch tube, and the light and dark of the incandescent lamp has the function of an indicator, which is worth implementing. If the power supply can operate normally after the false load is connected, the load size or input voltage can be appropriately changed, and the power supply can have a stable output, it can be concluded that the power supply is intact, and the disadvantage lies in the load; On the contrary, the shortcomings are investigated in the second step of the power supply.
Independent vibration circuit, check the shortcomings caused by the voltage regulator circuit module Now SMPS does not deal with the "hot bottom" problem, a large number of parallel optocoupler control voltage regulator SMPS, when the suspicion of voltage regulator circuit problems make SMPS intermittent operation, the optocoupler hot ground end of the two control pins can be disconnected # and the original pin is connected to a 10k variable resistor, so that the vibration circuit is independent, clean the influence of the voltage regulator circuit on the switching circuit, but the safety mode of low-voltage power supply should be selected, When the SMPS can start normally and have voltage output, it can be cleaned The shortcomings of the vibration circuit may be, the shortcomings are in the regulated circuit, most of the problems are the damage caused by the damage caused by the damage to the optocoupler, most of the damage caused by the damage will cause the optocoupler to be damaged together, if there is no voltage output, it is indicated that there is a local problem with the vibration circuit.
Gradually restore the protection circuit, check the shortcomings caused by the protection circuit moduleSMPS introduces over-current protection, over-voltage protection, under-voltage protection, and over-temperature protection
While protecting the SMPS itself safely, it also avoids damage to other operating circuits caused by the shortcomings of the SMPS. Most of the overcurrent sampling points of the overcurrent protection circuit are at the emitter potential of the main vibrating power tube. According to the voltage after AC rectification filtering or the power supply voltage of the main load, the sampling point of the overvoltage protection circuit is intermittently sampled and judged by the Zener diode & stable voltage tube.
The sampling point of the short-circuit protection circuit is generally intermittently discriminated sampling of the power supply of the low-voltage group output by the diode, and a "latching circuit" is arranged inside the power supply selected by a local equipment, and the "latching circuit" is a protection performance circuit in practice, and the intermittent control of the intermittent circuit is based on the signal transmitted from each sampling point. After cleaning and operating normally after ensuring the defects of the vibration circuit and the stable circuit, one protection is added before the protection starts, and the defects of the power supply can be determined by what kind of protection circuit is introduced.
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