How to choose a USB car phone charger that can be used for a long time

Release time:2018-04-10 09:55:39

If you urgently need a car charger now, you may buy one for just over ten yuan and throw it away after a few days of use. That's not a big deal. But if you want to buy a long-term, high-frequency product, things are not so simple. How to choose a USB car phone charger that can be used for a long time?
Appearance of car charger:
\t　　1、 The appearance must be good, without burrs, and the insertion must be convenient and smooth. Metal contacts should be thick, uniform, and elastic. Chargers that are difficult to plug and unplug can easily be damaged.
\t　　2、 The shell meets Rohs environmental standards, is hard and flame retardant. The charger will generate heat, and if the plastic casing does not meet Rohs standards, toxic gases will be emitted. The toxic gas in plastic is very powerful. Not a hard, flame-retardant plastic, it can be baked soft or even catch fire by a hot charger.
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The circuit components of the charger are roughly as follows:
\t　　1、 Resistance voltage divider. There will be a thick resistor inside the car phone charger. The voltage output in this way is unstable, and the resistor itself generates a huge amount of heat. Apart from being cheap, there are no other commendable advantages. The output current can be very large. Without short circuit protection, the consequences of a short circuit are fire or damage to the internal circuits of the car.
\t　　2、 Voltage regulator is a relatively large voltage regulator. Capable of outputting a current of 1A. Short circuits are quite dangerous, and a current of 1A is not a joke. Due to its strong load capacity, this slightly higher voltage than 5V can achieve faster charging.