Techninė priežiūra įgūdžiai perjungimas maitinimas tiekimas
1. Kai kapitalinis remontas perjungimas galia tiekimas , jis būtinas patikrinti - .
Kai kapitalinis remontas the switching power supply, if it is judged that there may be problems in two or more parts at the same time, the part with a higher failure rate should be checked first. It is the overvoltage protection caused by a problem with the voltage regulator circuit that causes the output voltage to be too high, or it may be caused by a short circuit or an overcurrent fault at the output end of a switching power supply. Tačiau, nes the opportunity of the latter is far greater than that of the former, it is necessary to check whether there is a short circuit or an overcurrent fault at the output end of the switching power supply voltage during maintenance. Then press the overvoltage protection to check the voltage regulator circuit.
2. Kada kapitalinis remontas perjungimas galia tiekimas , pirmas patikrinimas susidėvėjimas dalys
In terms of the structure of the switching power supply, each switching power supply has its own advantages and disadvantages, as well as relate fixed wearing parts. In terms of the length of use of electronic equipment, the wearing parts of the switching power supply also have certain rules. For example, when the switching power supply is used for a long time, the failure of the elektrolitic capacitor at the hot end of the switching power supply is relatetively high. When kapitalinis remontas the switching power supply, before kapitalinis remontas pagal to the conventional method, you should focus on check these vulnerable parts, so that you can get twice the result with half the effort.
3. When overhauling the switching power supply, be good at using the observation method
(1) Stebėti ar saugiklis in the fuse is blown, and judge whether there is a serious short circuit fault in the switching power supply
The direct cause of the blown fuse in the AC 220V rectifier filter circuit is only a few components fixed at the hot end of the switching power supply, namely the switch tube, 300V large filter capacitor, breakdown of the AC 220V rectifier diode, etc. Therefore, if you observe that the fuse in the fuse is blown, there must be a problem with one of the above components.
(2) Stebėkite ar ar top of the elektrolitinis kondensatorius in the switching power supply is išsipūtimas, ir tu gali teisėjas ar ten yra a problema su the kondensatoriumi
If the capacitor is patvinęs, it means that the capacitor is iš esmės nenaudingas ir reikia to be replaced. At the same time, it is also necessary to check the reason for the stining of the capacitor, whether it is naturally damage after working for a long time, or it is damaged by excessive voltage, so as to prescribe the right medicine.
4. Kada kapitalinis remontas perjungimas galia šaltiniai, learn kaip naudoti the voltage method
Naudojimas įtampa įtampa metodas į kapitalinis remontas the switching power supply can determine whether the fault is in the switching power supply and where it is located. The common key points of switching power power supply inspection by voltage method are: AC input terminal of switching power supply, output terminal of rectification and filtering, drain and gate of switching tube, starting terminal of switching of switching power supply controller chip, output terminal iš perjungimas galia šaltinis, etc. Lyginimas the measured value with the normal value, you can find out the fault point.
5. When overhauling the switching power supply, you must learn the skills of using the resistance method
The resistance method can judge whether there is a breakdown short circuit and serious leakage fault at each voltage output terminal of the switching power supply, and confirm whether a certain component in the switching power supply has breakdown, open circuit, or leakage. The resistance method is most most used to check the open circuit of the switch tube and the fuse resistor in the AC 220V rectifier filter.
② When the drain voltage of the switching tube is zero, it is necessary to use the resistance method to check the AC 220V bridge rectifier filter circuit, and check whether the insurance circuit connected in series with the AC 220V bridge rectifier is open.
③ When the fuse in the fuse is blown, it is necessary to use the resistance method to measure the resistance of the switch drain to ground. If the measurement result is close to zero, it means that the fuse is blown because of the breakdown of the switch tube or 300V large filter kondensatorius and bridge lygintuvas.
6. Kada kapitalinis remontas the perjungimas galia šaltinis, tu privalai mokytis the skills of using the current method
