The times are developing, science and technology are progressing, all kinds of mobile phones have entered thousands of households, and all kinds of mobile phone chargers have also been accompanied by thousands of households. These brands of mobile phone chargers, both mobile phone original chargers and compatible brand chargers, product names are also various, such as "power adapter", "fast charger", "USB charger", etc., so that consumers are dazzled, there is no way to choose, and the quality is uneven, because the mobile phone charger caused tragic accidents are also frequently reported.
In order to implement the theme of the Consumer Protection Year of the China Consumer Association "Guarding Safety and Unimpeded Consumption", so that consumers can obtain more objective and practical information on mobile phone chargers, as a reference basis for consumers to choose and use products, and to guide consumers to consume scientifically, rationally and safely, the Fujian Provincial Consumer Commission and the Fuzhou Municipal Consumer Commission conducted comparative experiments on mobile phone chargers sold by some shopping malls, department stores, professional markets, brand stores, mobile phone accessories stores and e-commerce platforms in Fuzhou at the end of July and the beginning of August 2021. And entrusted the Fujian Provincial Product Quality Inspection and Research Institute for testing.
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Compare test samples and sources (online and offline)
The comparative test samples were randomly purchased by the provincial and municipal consumer committee staff as ordinary consumers in 12 mobile phone brands and accessories sellers in and around Fuzhou City and 7 brand flagship stores of Taobao, a total of 20 models, involving 20 brands such as Huawei, OPPO, Scud, Samsung, Xiaomi, Pinsheng, etc., with unit prices ranging from 25 yuan to 179 yuan, of which 9 batches below 50 yuan, 8 models with 50 yuan to 100 yuan, and 3 models with more than 100 yuan; 7 batches of online samples. Offline samples in 13 batches.
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Inspection standards and items
The comparative test sample entrusted fujian provincial product quality inspection and research institute in accordance with GB 4943.1-2011 "information technology equipment safety part 1: general requirements", GB/T 9254-2008 "information technology equipment radio disturbance limits and measurement methods" and the current effective or online declaration of the enterprise standards and product quality indicators and requirements or other compatible commodity standards, etc., the marking and description of the sample, electrical insulation, creepage distance and clearance, etc., In-line equipment, abnormal heat resistance, electrical strength, power terminal disturbance voltage 7 items to test. The comparative test results are only responsible for the samples purchased, and do not represent the quality status of different batches and models of goods of the same brand.
Tags and descriptions
Specification Chinese should be used, including rated voltage (or rated voltage range), rated frequency (or rated frequency range), rated current, manufacturer name or trademark or identification mark, model code identification or model mark specified by the manufacturer, safety instructions and markings, etc.
Electrical insulation
Electrical insulation is mainly used to evaluate the ability of insulation materials of mobile phone charger products to protect against the danger of electric shock. If the project does not meet the requirements of the standard, the product is easy to make the insulation failure in hot and humid weather, bringing the user a risk of electric shock.
Creepage distance and clearance
The interstitial clearance and creepage distance project mainly assesses whether the insulation layout design in the product is reasonable and whether the insulation will break through.
In-line devices
In-line equipment is an important item in the safety rule test, the plug pin of the mobile phone charger is connected with the 220V power grid power supply, if the size of the latch does not meet the standard requirements, it will make the consumer touch the latch with dangerous voltage during use, resulting in the risk of electric shock.
Resistant to abnormal heat
During the use of the test product, the shell will withstand a lot of heat due to poor contact with the socket socket, its own heat, etc., causing the shell to gradually become soft and melt, the mechanical strength to decrease, the insulation failure, which may cause the displacement of live components, resulting in short circuits, electrical clearances and creepage distance reductions and other phenomena and electric shock accidents.
Electrical strength
The electrical strength is mainly used to evaluate the insulation performance of the product, if the project does not meet the requirements of the standard, the product may be broken down due to the insulation and thus bring the risk of electric shock.
The power terminals disturb the voltage
Power terminal disturbance voltages are primarily used to evaluate the effect of conducted interference from products connected to the utility grid on other devices in the grid. If the project does not meet the requirements of the standard, the product may affect the normal use of other surrounding equipment, resulting in associated dangers or property damage.
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Comparative analysis of trial results
From the comparative test of mobile phone chargers, the markings and descriptions of 19 samples in 20 samples, electrical insulation, creepage distance and clearance, in-line equipment, abnormal heat resistance, and electrical strength are in line with GB 4943.1-2011 "Information Technology Equipment Safety Part 1: General Requirements", with a pass rate of 95%, reflecting the overall quality of mobile phone chargers sold in the market, but after testing, it was also found that the "SENDEM" produced by Shenzhen Soundton Technology Co., Ltd. C66 model charger electrical insulation, creepage distance and clearance, abnormal heat resistance, electrical strength four items do not meet the requirements of the standard, there are safety hazards.
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Consumption reminders
Mobile phone charger as a daily use of information technology equipment, consumers in the purchase and use of the process, in addition to paying attention to the function, appearance, price of the product, can not ignore the quality and safety of use, but also pay attention to the following aspects:
(1) Select the brand of the merchant.
When consumers choose mobile phone chargers, they should try to choose regular businesses or e-commerce platform flagship stores such as large shopping malls and department stores, brand stores, etc., to buy chargers that match the same brand as mobile phones or mobile phones and have a high reputation in the market, usually these brands are relatively guaranteed in terms of product quality and after-sales service, do not covet cheap, buy low-cost inferior products, otherwise mobile phones are likely to become "invisible killers" around. For example: Last year, the Guizhou Fire Protection Bulletin 7.8 fire accident was caused by the failure of inferior mobile phone chargers, resulting in 7 deaths.
(2) Check the packaging identification.
Consumers should have a basic understanding of the relevant parameter information of the mobile phone in advance, and carefully check the product packaging identification when purchasing the mobile phone charger, such as the product name, specification model, rated voltage range, rated current, interface type, applicable model, etc., and the mobile phone charger belongs to the national CCC mandatory catalog of products, consumers must confirm whether there is a CCC certification mark when purchasing, the authenticity of the CCC certification mark can be to the National Certification and Accreditation Administration "National Certification and Accreditation Information Public Service Platform" Make a query.
(3) Check the product details.
Take a look at the product nameplate. After unpacking, it is necessary to check whether the nameplate of the mobile phone charger is Chinese Simplified, whether the relevant product parameter information is marked (it must contain the rated voltage or rated voltage range, the symbol of the nature of the power supply, the rated frequency or rated frequency range, the rated current, the manufacturer's name or trademark, model, safety instructions, etc.), whether the product information marked is consistent with the content on the product packaging logo, etc., and the logo on the nameplate should be clear and not easy to erase. And there are sufficient safety warning instructions (e.g. if there are warnings for altitudes of 2000m and non-tropical areas). Second, look at the product workmanship. Check whether the plug shape and joint processing of the mobile phone charger are fine, smooth and rust-free, and pay attention to whether the power plug is the standard plug style in China (it should be a thin sheet type pin, there should be no round hole on the plug, nor should it be cylindrical, square column type and other non-thin sheet forms). The surface of the plastic parts of the shell should be smooth and smooth without burrs, the color and luster should be uniform, the seams of the shell should be tight, and there should be no gaps in pressing.
(4) Pay attention to safe use.
First, when using the mobile phone charger, it should be taken lightly to avoid falling, impact, etc. caused by damage to the shell and internal components, and to prevent the risk of electric shock;
Second, when using a mobile phone charger to charge a mobile phone, try not to use the mobile phone while charging, which is easy to cause electric shock;
Third, due to the poor ventilation and heat dissipation ability of mobile phones, do not cover the mobile phone in the bed or under the pillow when charging, so as not to cause the temperature of the battery to be relatively high, and then the tragedy of breakdown, combustion, explosion and so on. At the same time, it is also necessary to avoid charging in supercooled, humid and other environments;
Fourth, in the process of use, it is found that the mobile phone charger is overheated and other phenomena, and should be stopped immediately;
Fifth, after the mobile phone is charged, the mobile phone charger should be unplugged in time to avoid being in a working state for a long time, accelerate the aging of devices and materials, shorten the service life of the charger, and even easily short circuit or high voltage breakdown, thus causing the danger of fire. For example: in a fire notification in Zhuhai, Guangzhou this year, the charger was not unplugged in time after the mobile phone was charged, and the circuit was short-circuited, causing the mobile phone charger to explode, thus causing a fire;
Sixth, many children now also have the habit of carrying mobile phones, and parents must remind children how to use mobile phones correctly and safely!
Source: Fujian Consumer Rights protection commission
Editor: Hong Meijuan