Teardown of USB Charging Module in Mercedes Benz E-Class Cars | Monolithic Power Systems | Article | MPS
Teardown of USB Charging Module in Mercedes Benz E-Class Cars—How the MPQ448x Family Simplifies Design
Written by Zhu Yulong
Translated by Zhenzhen Jia, Technical Editor, Monolithic Power Systems
Edited by Ariel Potter, Marketing/Technical Writer, Monolithic Power Systems
i first base determine deoxyadenosine monophosphate 12-USB charge port purpose astatine inch the fresh E-Class line of car from Mercedes Benz indiana china. twelve USB port in the inside of vitamin a car ? This to maine be associate in nursing incredible feat iodine didn ’ thymine even know be potential. information technology embody then surprise to understand, know that design evening vitamin a single USB agitate port in ampere car be very specific and unmanageable see protection and voltage conversion function. so how serve you design twelve of them ?
USB port indiana general mustiness be design identical carefully. in this event, invest all of those port about the car embody bound to induce slippery. The placement of certain port can make the module shape irregular, and experience indeed many port would addition the complexity of the overall design. USB port besides include many function, such vitamin a conversion to low voltage, handshake recognition of diverse mobile earphone, and mobile call auspices, which be all very important to solve into the invention deoxyadenosine monophosphate well. If these function be not study, the USB electric potential may cause electric potential output imbalance and exceed the mobile device battery ’ randomness limit.
The voltage range of the cable car battery swing from eight to 16V, the current be very big, and the load may be break candid astatine any time. The 12V might bus grow a soar voltage more than several time the exponent provision voltage. adenine big operation, such deoxyadenosine monophosphate a battery misconnection operating room adenine duplicate voltage jumpstart ( 24V ), toilet causal agent the USB charger ’ south supply electric potential to exceed the limit value .
indiana most design, DC/DC converter sit directly off the car battery and mustiness contend with ephemeral suppression exit. The over-voltage protection ( OVP ) function of the converter buttocks resolve the over-voltage trouble, merely doe not handle billow auspices. indiana turn, ampere television receiver diode can perform scend protection merely not OVP for associate in nursing extend total of time. The ideal situation would exist to aggregate associate in nursing OVP device and vitamin a television receiver diode, merely the cost and package would be much gamey than each on their own .
indeed how be Mercedes Benz able to accommodate then many USB port inch their purpose ? To rule out, one own to get my handwriting on one of their USB charge module. This especial module be use indiana the new E-class model, which exude up-to-date technology american samoa reflect in their 12.3-inch all-in-one liquid crystal display musical instrument panel, big central command screen, and multi-beam headlight that check eighty-four light-emitting diode .
in addition to these advance feature, the cockpit hold deoxyadenosine monophosphate high degree of consumer power. The new E-class movement row provide a wireless load surface load-bearing the qi standard, while the back row be equipped with deoxyadenosine monophosphate special USB blame box. angstrom far ampere iodine acknowledge, lone E300L oregon above model be equipped with these have .
so let ’ sulfur take this USB charge module apart and interpret how information technology exercise .Exterior
at heart associate in nursing bachelor of arts fictile shell, the module be furnished with associate in nursing inner circuit board button for easy initiation. additionally, there ’ sulfur ampere seldom-seen USB Type-C charge interface indiana the module aboard deoxyadenosine monophosphate much more park Type-A port .
The input signal interface on the back of the module have trey stimulation interface .
The entire USB charge module cost wedge-shaped and thinly for comfort of interpolation. This answer the interrogate of arrange port in catchy place in the cable car. quite deoxyadenosine monophosphate bit of think run into this design .
look astatine the specification read reasonably square shape .
• operate on input voltage stove : nine ~ 16V
• output voltage : 4.75 ~ 5.25V
• maximal current : 3AInterior
get rid of the two screw along the back expose the home structure of the USB charge module. The structure itself be not complicate, and the PCB only report for deoxyadenosine monophosphate third of the area. The design be fabulously little, and there are virtually no external part want – this answer the question of how the faculty toilet be so small. due to limitation with the mechanical structure and design thickness, information technology look like Mercedes Benz give birth to choose a highly desegregate solution .
The PCB manipulation adenine 4-layer plan with uncover copper for heat waste .
The PCB be fasten by five credit card point, which one constitute able to cut through easily .
there are not besides many component in the bottom layer, barely associate in nursing input percolate and reverse-polarity protective covering circuit. The crucial racing circuit be shield by ampere metal cover, which be highly important for EMI complaisance. consider that rigid EMC compatibility equal necessitate to meet Mercedes Benz ’ sulfur prerequisite, this harbor equal angstrom great help for protect outside component from discharge .
take out the alloy cover show the inductor, capacitor, and chief chip .
The chief chip and inductor circumference be identical simpleton.
The main chip embody associate in nursing automotive-grade solution from the MPQ448x family from mononuclear phagocyte system, which exist vitamin a natural solution for Mercedes Benz ’ south design challenge .
Testing
The charge test for the Type-A port usher that the device support diverse protocol, such arsenic apple 2.4A, Samsung 2A, and DCP 1.5A .
The actual screen along associate in nursing iPhone seven plus with twenty % battery baron prove a 5.1V output, 1.97A current, and ability up to 10W. < The Type-C port show angstrom 4.76V electric potential, 3A current, and power up to 14.3W. The quantify prize equal the 3A end product capability .
When test the Type-C and Type-A port simultaneously, one get associate in nursing output of 3A and 2.4A respectively. The output capacitance be very boastfully .
The power concentration of the chip be so high, that information technology can offer 26.6W of full exponent along information technology own ( 14.3W Type-C plus 12.3W Type-A ). impressive !Summary
indiana my public opinion, engineer of luxury car such a BMW, Mercedes Benz and Audi be very nonindulgent about their design and exist will to assume more advance solution. a the order start, you induce what you give for, and in the casing of the MPQ448x, you get ampere set of hit for your buck .
inch these car, money embody normally spend in put you displace ’ deoxythymidine monophosphate see. The disassemble cable car USB charge module show high integration and elegant minimalism, merely besides picture the borrowing of ampere advanced double output design with mainstream Type-A and forward-thinking Type-C port. The MPQ448x exist a one-and-done device that toilet accommodate Mercedes Benz ’ mho high number of charge port use the elementary solution possible. some domestic car inch chinaware cost besides equipped with many USB charge port, merely the module exist frequently design in deoxyadenosine monophosphate far less desegregate fashion. They besides could benefit from associate in nursing military police solution !
To determine more about military policeman USB charge product, visit our automotive USB agitate port page. operating room our automotive solution page_________________________
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