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Why is the USB port in Mercedes-Benz cars a small interface?

1 Answers

VanBrooklyn

07/29/25 3:47pm

This is a design issue, as the small port is more convenient. The USB port is located below the center console panel and is accompanied by a card reader and a 3.5mm headphone jack. The car USB can be used to read USB drive information for the car entertainment system, charge mobile phones, and other functions. However, due to power limitations, the charging rate is not high. When using a USB car charger, pay attention to the following three points: Pay attention to the voltage range: During the charging process of the mobile phone battery, ensure that the output voltage of the power supply is within the specified range; otherwise, the charging function cannot be achieved. Keep the USB car charger dry: Rain, moisture, and various liquids or moisture may contain minerals that can corrode electronic components and circuits. Under normal conditions, this part of the circuit will reduce the output voltage by about 0.6V and decrease stability. However, the negative feedback established through R21 and R32 on the transistor can eliminate these issues. A high-quality reference voltage source is essential: The reference voltage chip IC2 is connected to an emitter follower (T4), so the reference power supply can provide up to several milliamperes of current. Car charger wholesale manufacturers remind everyone not to place the USB car charger in high-temperature areas. High temperatures will shorten the lifespan of electronic devices, damage the battery, and cause some plastics to age.

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