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Mobile phone charger purchase is used to pay attention to
A recent incident reported by Weibo has raised concerns after a flight attendant was electrocuted while using an iPhone 5 during charging. According to police sources, the flight attendant was still using the phone while it was connected to the charger, which led to the unfortunate accident. This event has sparked widespread discussion about the safety of charging devices and whether using a phone while it's charging can lead to electric shocks.
So, is it dangerous to make calls or use your phone while it's charging? And how can you choose a safe and reliable charger? Experts from the Mechanical and Electrical Department of the Zhejiang Jiaxing Inspection and Quarantine Bureau have conducted in-depth research on this issue.
First, the problem may lie with the charger itself. A typical mobile phone charger consists of several key components: an input circuit for the main voltage, a high-frequency switching transformer, a secondary rectifier output circuit, and protection circuits against overheating and overvoltage. Normally, the input is 220 volts, and the output is 5 volts at 1 amp DC, which is generally harmless to the human body. However, if the charger has defects such as a failed isolation between the primary and secondary circuits or aging components, the output voltage could rise to dangerous levels. If both the phone’s charging port and case are made of metal, the entire device could become electrified.
Second, environmental factors like high temperatures can increase risks. During summer, when the ambient temperature is high, the charger might not cool properly, leading to unstable current flow and a higher chance of malfunction. Phones with metal bodies are more conductive, making them more susceptible to shocks. Additionally, users who sweat more or have wet hands (e.g., after a shower) are at greater risk of electric shock.
Experts also warn that there are multiple dangers associated with charging. First, the voltage inside the phone increases when it is in use, especially during calls, which can damage internal components. Second, unqualified chargers or batteries can cause explosions due to poor design or inadequate heat dissipation. Third, using the phone while it's charging can increase its transmission power, resulting in higher radiation levels. Therefore, it's best to avoid making calls while your phone is charging.
When choosing a safe and reliable charger, here are some important tips:
Always try to use the original or manufacturer-recommended charger. These are designed specifically for your device and ensure compatibility and safety during the warranty period.
If you're purchasing a third-party charger, make sure it has the necessary certifications, such as the CCC mark in China, or CE and UL for international markets. These marks indicate that the product meets safety and quality standards.
Standard chargers will clearly display technical specifications, including output voltage, current, and usage instructions. Look for labels indicating that it's a second-class appliance, suitable for indoor use, and that the casing is recyclable. If possible, use a multimeter to check the no-load voltage and short-circuit current of the charger to ensure it matches the stated specifications.
By following these guidelines, you can significantly reduce the risk of accidents and protect your device and your safety.