Converter 6-23V to 5V (3A)
I'm sick of a bunch of wires in my carcigarette lighter. At least two devices are constantly powered from it: the DVR and the navigator. Plus, sometimes a 220V converter is added. Since the DVR and navigator are powered by USB, it was decided to purchase some kind of 5V converter and wiring to the car with the output of USB connectors in the nearest available places (closer to the device).
I could have a simple stabilizer myself soldered onLM7805, but I don’t know where to dissipate power, and I didn’t want to fence large radiators in the car. Due to the fact that the conversion efficiency of simple stabilizers is too low, it was decided to find a converter on Chinese sites with an ampere output current of two (no less). Since, according to the description, 0.5 A is allocated to any USB device, two amps will suffice for 4 devices.
At first, I thought there would be no problem searching, but I was wrong. I will not write a long search process, I’ll just write that the result was a converter that I purchased.
Characteristics of it:
Maximum output current 3A at 5V
Input voltage 6-23 V
Efficiency more than 80%
If the device has such a higher efficiency, then the current from the on-board network will be approximately half as much as at consumers.
The device came in exactly 20 days. To be honest, I did not expect it to be so small. In the load in the package put more headphones.
I did not check them.
Immediately I tested the device on xx. Without a load, it gives 5.3 V.
At work, decided to conduct tests.
For starters, I took a car bulb for 55 wattsand connected to the test power supply, which put 5V. The current at this voltage exceeded 3 A, therefore, in series with a light bulb, hung a load resistor of 0.51 ohms. The current through this circuit fell to 2.66A.
By connecting this circuit through a converter and supplying 14.0 V to it, I received a current along the primary circuit of 1.17 A.
The converter heats up, his hand barely suffers.
Since this is almost the ultimate mode of operation, it was decided to find another load. This load was a 12 volt 40 watt lamp. If you apply 5 V to it, then the current flowing through it is 1.93 A
Having connected this lamp through the converter we have:
Input voltage: 15.3 V, current 0.78 A, (efficiency = 80.9%)
Input voltage: 14.0 V, current 0.84 A, (efficiency = 82.0%)
Input voltage: 13.0 V, current 0.90 A, (efficiency = 82.4%)
Putting 14.2 V on the power supply unit, I left the converter to work for the whole day. The temperature of the converter, in my opinion, was 50 degrees. The output voltage was stable at 5.00 V.
As a result, the converter met my expectations, now I have to integrate it into the car.
Conclusion: to take, who understands this business.
P.S. This converter has a switch (jumper) for output voltage of 5V or 6V. On xx, the converter issues 5.97V if you turn on the output to 6V.