There may be the following reasons:1. If there is poor contact between the adapter power cord and the adapter jack, the spark should be replaced, and the small metal column of the adapter jack should be cleaned.2. The magnetic core of the switching transformer in the adapter is loose, but it can not be dealt with. If you can't stand it, open it and fill the switching transformer with resin.The···
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Reliability indicators mainly include reliability, average life, failure rate and failure density.1. Reliability: The reliability of the product is the probability of normal operation, which refers to the probability that the product can complete the specified function under the specified conditions and within the specified time. When calculating the reliability, the larger the number of products ···
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1. Input voltage range: when the input voltage of the switching power supply changes, the input voltage variation range that keeps the output characteristics unchanged. The wider this range, the stronger the ability of the power supply to adapt to changes in the external mains, and the wider the working range of the switching power supply. It is related to the error amplifier inside the switching ···
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North America North America: FCC, FDA, UL, ETL, DOT, NSF, EPA, CSA, ICEuropean Commission: CE, E-mark, RoHS, WEEE, VDE, TUV, GSChina China: SRRC, NAL, SFDA, CPA, CMC, CECP, EEL, SELO, CCMSJapan Japan: VCCI, PSE, JATE, JQA, S-MarkKorea Korea: KTL, MIC, EK-MarkAustralia/New Zealand Australia/New Zealand: A-Tick, C-tick, DOFT, QAS, SAIRussia Russia: GOST-RHongkong: HKSI, OFTASingapore Singapore: SPRI···
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First of all, the nominal voltage of the general power supply refers to the voltage of the open-circuit output, that is, the voltage when there is no external load and no current output, so it can also be understood that this voltage is the upper limit of the output voltage of the power supply.In the case of using active voltage-stabilizing components inside the power supply, even if the mains vol···
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1. Power adapter fuse: It is mainly used for overload protection. If the fuse is properly placed in the circuit, the fuse will cut off the current when the current abnormally rises to a certain height and heat, thus protecting the safe operation of the circuit.2. Inductance coil (also known as choke coil): blocking effect and tuning, frequency selection effect.3. Rectifier bridge: Convert alternat···
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1. Is the current of the power adapter good? The unit of battery capacity is mAh (milliampere-hour), and the unit of current is A (ampere) or mA (milliampere). The two are not the same physical quantity, and the battery capacity and charging current are not the same. necessarily contact.2. Is the current of the power adapter large? The current value marked on the mobile phone charger (actually cal···
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The increasingly developed portable electronic products have higher and higher requirements on the performance of rechargeable batteries such as capacity and cycle life. There are four types of commonly used batteries, nickel-cadmium batteries and lead-acid maintenance-free batteries (SLA for short) in the last century. It has been widely promoted in the 1960s, and the two categories of nickel-met···
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1. The load of the switching power supply is short-circuited (especially the DC/DC converter is short-circuited or has poor performance, etc.), at this time, first disconnect all the loads of the switching power supply circuit, and check whether the switching power supply circuit is faulty or the load circuit is faulty. If the load circuit is disconnected and the voltage output is normal, it means···
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