Fault determination of electric chargers and maintenance methods (total 3 pages)
-cal-finghai. -(yicai) -company onel
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Fault determination of electric chargers and maintenance methods
In electronic intelligence controller
Fault determination of electric chargers and maintenance methods (total 3 pages)
-cal-finghai. -(yicai) -company onel
-cal - this page is only used as the document cover. Please delete it directly
Fault determination of electric chargers and maintenance methods
High-standard technology in the electronic smart controller industry, which invests heavily in technological innovation and product development, equipment upgrades, the production of the most innovative and technocratic electronic smart control products and the possession of electric vehicle controls, electric chargers, electric car alarms, electric motor vehicles, motorcycles, and electric traffic tools are all five main product lines of the solution, and are strategic partners with high-end electric vehicle complexes such as the amma electric vehicle, the yadi electric vehicle, the green electric vehicle vehicle, the stand-down electric vehicle, the bidman electric vehicle and the kim peng electric vehicle. And what high-profile technology has shared with you today is some of the small experiences of repairing electrical charger failure: normally, the breakup of the fuse pipe indicates a short circuit or passing failure of the inside circuit of the charger. This is due to a high failure rate of internal devices in high voltage, large currents when chargers work long hours. In addition, volatilities of grid voltage can cause the currents in chargers to increase instantaneously and the fuses to melt。
Method of repair: first, look carefully at the elements above the circuit board to see if the surface of these elements has been burned or leaked with electrolytic fluids, smelling or not. Remeasure the electrical resistance at the power input end, if smaller than 20oks, indicating a local short circuit at the back end, and then measure the resistance of four whole-stream diodes, anti-power resistance and two limited-flow resistance, respectively, for short circuits or burn-out; and finally, the ability of the power source filter to perform normal charge discharges, whether the switch power tube is damaged, whether uc3842 and surrounding elements are punctured, burned, etc. It should be noted that, as a result of road measurements, they may result in errors or miscalculation, and therefore they can be welded down as necessary. If this is still not the case, then a measurement is made of whether the input and output power lines are short-circuited internally. In general, in the melting failure of the smelting device, the whole-stream diode tube, the power filter, the switch power tube, uc3842 is vulnerable, with a probability of damage of more than 95 per cent, which can easily be eliminated by focusing on checking these elements。
No direct current voltage output, but the fuses are intact, which means the chargers are not working, or they're working to protect themselves。
Method of repair: first, it should be determined whether the charger's uc3842 is in a state of kinghood or has been damaged. This is determined by adding a 7-foot ground-to-ground voltage measure of uc3842, which indicates that the circuit has been activated and uc3842 is basically normal if the 7-foot voltage is normal and the 8-foot voltage is +5v and the 6-foot voltage is different. If the voltage is low on seven feet and no voltage on the remaining tube feet, it is shown that uc3842 was damaged. The most common damage was seven foot-to-ground penetration, six or seven foot-to-ground penetration and one or seven foot-to-ground penetration. If none of these feet are punctured and the charger is not properly activated, it also indicates that uc3842 has been damaged and should be replaced directly. If the chip is not broken, check whether the switch's current-restrictive resistance is welded, welded or variable and whether the switch power tube itself is not functioning well. In addition, the power output line is cut off or poorly exposed, which can cause such malfunctions and should therefore also be noted in maintenance。
No direct current or voltage output is unstable if the fuse is intact, in a loaded inert. The main causes of such failures are: over-pressure, over-flow protection, circuit openings, short-circuit phenomena; the lack of work on vibrating circuits; overloading of power sources; high-frequency filtration filtering of wave circuits through the current diodes; leaks in filters, etc。
Method of maintenance: first, measurement of hf by universal meter
