RV accessories——USB Car Charger

14/03/2022
USB car chargers refer to on-board chargers that are conventionally powered by car batteries (12V for cars, 24V for trucks), and are widely used in the field of lithium battery charging for various portable and handheld devices.
Such as: mobile phone, PDA, GPS, etc.; the car charger should not only consider the actual needs of lithium battery charging (constant voltage CV, constant current CC, overvoltage protection OVP), but also take into account the harsh environment of the car battery (transient peak voltage, system switching noise interference, EMI, etc.); therefore, the power management IC selected for the car charger solution must meet the following requirements: high-voltage, high-efficiency, high-reliability, and low-frequency switching power chips that are conducive to EMI design.

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Precautions
The car charger uses the car cigarette lighter as a power outlet to directly charge the mobile phone. Since the voltage provided by the car is low, only an overload protection circuit is required inside the car charger. The front end of the car charger socket is designed with a fuse tube. When the current exceeds the acceptable range of the overload protection circuit, the fuse will be blown immediately to play a protective role. Note: It can only be charged when the car engine is started! Here are some more notes about car chargers:
1. Do not use the car charger in a humid environment
2. Do not store the car charger in a humid environment
3. The suitable temperature for use is 0-45℃
4. Keep away from children
5. Avoid lightning strikes
6. Pull out the plug in time after charging
Therefore, for safety reasons, you must buy regular brands and buy genuine products. Poor quality products are prone to safety hazards. There are two types of car chargers: direct charging and cradle charging. You can choose to buy a cradle charger, that is, remove the battery to charge, to avoid the phenomenon of burning the phone due to unstable vehicle power supply and high voltage output peak. There are a variety of car chargers available on the market. If you choose to buy online, you must go to the official website to buy.

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how to buy
Car charger products are all over the market and the Internet. Whether the riders buy it in the store or online, the types are different. I don’t know which one to compare. We also know that the car charger is not very expensive, but if you buy it If there are counterfeit products, it is very likely to burn car fuses and digital products. It may even endanger personal safety. So how can we improve our skills in selecting high-quality car chargers?
1. First of all, you must know the output voltage of your car cigarette lighter
The output voltage of the car is 12V, and the output voltage of the truck is 24V. Most of the general-purpose on-board chargers (12V) are suitable for cars. If it is other models, you need to choose the corresponding voltage standard. There are many car chargers that can already achieve the 12V-24V standard, that is, all models are applicable.
2. To understand the automatic protection function of the car charger
Whether the car charger has functions such as overvoltage, overcurrent, overheating, and short circuit protection, the shell should preferably be made of ABS flame retardant and environmentally friendly materials, which can prevent external combustion and be beautiful, and do not leave fingerprints when touched.
3. Pay attention to the voltage and current
When purchasing a car charger, pay attention to the voltage and current of the supporting equipment. For example, the iphone is 5V/1A, and the tablet computer and mobile power supply are mostly 5V/2A. If the dual-USB port car charger charges a mobile phone and a tablet at the same time, the total current of the car charger must be at least 3A or more, otherwise the charging speed will not only drop significantly, but it will also overheat and even damage the device.
4. Know what the total current of the purchased charger is
Generally, regular products will indicate the output current on the charger. If the purchased charger is not only slow but also generates a large amount of heat when charging the mobile phone + tablet, it means that the current does not meet the standard.