Recently, Weibo has reported that a flight attendant was connected to the iPhone 5 while charging. According to police sources, the flight attendant was determined to have been electrocuted, but was still using a rechargeable mobile phone to verify.
Then, when the mobile phone is charging or making a call, will it cause electric shock? How to choose a safe and reliable charger? The mechanical and electrical department of Zhejiang Jiaxing Inspection and Quarantine Bureau has analyzed and studied this.
Analysis of the possibility of charging a mobile phone call:
First, the charger may have problems. The mobile phone charger circuit generally consists of a primary voltage regulator input circuit, a high frequency switching transformer, a secondary rectifier output circuit, and some overheat and overvoltage protection circuits. Under normal circumstances, the input is 220 volts, the output is 5 volts, 1 amp DC, it will not cause harm to the human body. If the charger itself has problems such as transformer safety isolation failure and component aging, it may cause the output voltage to reach 220 volts. If the phone's charging interface and the case are both metal, the case will be charged.
Second, the temperature is too high to increase the risk. In summer, the temperature is high, the charger will not heat well, the current is unstable, and the possibility of problems will increase, especially the mobile phone with metal body is more conductive. There are also some users who sweat more in the palm of their hand in the summer, or if the hair is wet after bathing, it will cause electric shock.
Experts said that there are many hazards when charging. First, the voltage of the mobile phone is higher than the standby state at the same time. At the same time, other operations, such as talking, the voltage will be many times higher than usual, and the internal parts are easily damaged. Second, the unqualified charging. The battery of the mobile phone and the mobile phone may cause an explosion due to design defects and poor heat dissipation. The third is to make a call while charging, the mobile phone will increase its transmission power, and the radiation will be stronger. Therefore, it is best not to call when charging your phone.
How to choose a safe and reliable charger? Remind consumers here:
Try to use the original or recommended standard charger. The original charger is strictly designed and produced by the mobile phone manufacturer, and is compatible with the mobile phone itself, and ensures safety during the warranty period.
Under normal circumstances, the domestic regular sales (national bank) chargers, mandatory regulations must be attached to the CCC certification mark. If it is produced or sold in other countries and regions, it should be accompanied by mandatory certification marks of relevant countries and regions, such as CE and UL.
The standard charger products will indicate the technical parameters such as the scope of use, output voltage and output current, as well as the “back†sign indicating the second type of appliance, the house sign indicating indoor use, and the recycling mark indicating the reuse of the outer casing plastic. If there are conditions, you can use the multimeter to test the output no-load voltage value and output short-circuit current value of the charger to determine whether the actual data is consistent with the marked technical parameters.
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