Before the first month, the Redmi K4 series was released, and the charging was still 33W fast, but according to Xiaomi, this 33W comprehensive experience was quite sincere. Almost at the same time, Xiaomi 33W gallium nitride charger was put on sale. Although it didn't become the standard charger of Redmi K4 series, it also caused a heated discussion. The charging head network also dismantled it at the first time and launched a detailed dismantling report, which interested friends can click to view.
according to the statistics of charging head network, Xiaomi's 33W gallium nitride charger is the third gallium nitride charger launched by Xiaomi. Xiaomi has already launched Xiaomi's 65W USB-C gallium nitride charger and Xiaomi's 55W USB-A magic change gallium nitride charger.
Xiaomi 65W gallium nitride charger first appeared in Xiaomi 1 conference, and the mobile phone and charger are actually complementary. Nowadays, Xiaomi 1 series sells well, and it has also won the title of "flagship goalkeeper". Gallium nitride is becoming more and more popular. It can be said that non-Gallium nitride is hard to be called a high-end charger, and Xiaomi 65W Gallium nitride charger has become a generation of classics.
Xiaomi's 55W gallium nitride charger is theoretically the "distributor" of Xiaomi 11. Only when Apple and Samsung are not going to send the charger, Xiaomi has made the charger semi-independent, which not only gained a good reputation, but also paved the way for the charger to be completely independent in the future. It can be called killing two birds with one stone.
gallium nitride chargers are actually new things, which may be familiar to you and me. From the point of view of ordinary consumers, it is inevitable that these products with similar names are still somewhat "dazzled". Therefore, we have launched the "one article to understand the series", hoping to help you better understand the products through simple comparison. At present, there has been a "2W dispute! One article understands the difference between Apple's 18W fast charge and 2W fast charge, one article understands the difference between Xiaomi's 65W and 55W gallium nitride chargers, and one article understands the difference between rechargeable AA lithium battery and Ni-MH battery. Which one would you choose? ","I understand Lenovo's 12 PD chargers, which have everything from 45W to 9W gallium nitride fast charging "and" All dry goods! One article understands Samsung S2 Ultra Charging Compatibility, the other article understands the charging speed comparison of four iPhone 12, and after reading it, it becomes a great god ... < P > Today, let's understand the difference between Xiaomi's 33W, 55W and 65W gallium nitride fast charging!
First, the external comparison of the charger
Compared with the appearance of the mobile phone, the appearance of the charger as an accessory is indeed relatively monotonous. The design of popular products must serve the function first, which is understandable, so the external comparison of chargers is nothing more than making differences in color, body shape and volume.
1. Appearance
The design of xiaomi 65W gallium nitride charger is very simple. The PC has a white flame-retardant shell, and the words Xiaomi 65W are printed on the side with very light gray silk screen. The overall shape is dominated by long strips, and the slender figure with simple design has a high value.
the appearance of the 55w adopts family design, and it is also a white shell made of PC flame retardant material, with a bright waist and a smooth transition between all sides. The pins and USB-A interfaces are all designed by the side, which is very typical.
Xiaomi 33W gallium nitride charger has a whole white body, with rounded transition around the corners and flattened upper and lower sides. The letter information of xiaomi 33W is laser carved on the side of the shell, which can be roughly understood as half of Xiaomi 65W gallium nitride charger in appearance.
2. Interface
Xiaomi 65W adopts a single USB-C interface, so the mother seat and the shell are accurately positioned. USB-C interface is the current trend, but also the future trend. As a charger sold separately, it is natural to adopt C port.
55W adopts USB-A interface, with side design and orange rubber core. The positive and negative spring plates of the A-port female seat are widened, and a special contact is provided to realize PD output. Since Xiaomi 9 mobile phone, every generation of standard chargers has been magic change, and Xiaomi seems to be happy to build the charger ecology in magic change. As for the future of this road, it will take time to test.
33W is the same as 65W, and both adopt a single USB-C interface, which conforms to the general trend.
3. Volume
When Xiaomi 65W was released, gallium nitride was in the ascendant. Xiaomi uses gallium nitride power devices, breaking through technical barriers, concentrating the volume to 3.8 3.8 56.3mm, and the power density is as high as 1.21W/cm? The power density exceeds one cubic centimeter and the output exceeds one watt, marking the coming of a new era.
and 55W here, the measurement volume is 52.58 41.85 28.34mm, and the calculated charger volume is 62.36cm? . In terms of power density, based on the maximum output of 55W, the power density is about .88W/cm? .
the three-dimensional parameter of Xiaomi 33W charger is 3.33x3.28x34.26mm, and the computable volume is about 31.464cm? Based on the maximum output of 33W, the power density is about 1.5W/cm? .
4. Weight
The weight of Xiaomi 65W is only 82g, which makes it a lightweight charger of this level.
the weight of the 55w charger is about 11.9g, which is heavier than the above 65W.
The net weight of Xiaomi 33W charger is about 5.7g, which is only about 6% of the weight of 65W.
5. Attached wire
A data cable is distributed in the package of Xiaomi 65W gallium nitride charger, and the wire is tied up regularly with rubber straps. The connector specification is USB-C to USB-C. With a length of 1m, the E-Marker information of the wire is read by the POWER-Z KM1C tester, and the wire supports the current transmission capacity of 2V 5A, which is often called 1W 5A E-marker wire. In terms of data transmission, it supports USB2. transmission rate.
the charging cable attached to Xiaomi 55W is USB-A to USB-C cable. Both ends of the cable are treated with bending resistance and the plastic shell of the cable head is frosted, which is convenient for users to plug and use. The positive and negative poles of USB-A male head are widened to pass large current, and the center is equipped with special shrapnel, which is orange in color and somewhat chic. The length of the cable is about 1m and the diameter is 3.73mm.
Xiaomi 33W charger also comes with wires in the package, which are tied up regularly with rubber straps. The connector specification is USB-C to USB-C.. The end-to-end length of the wire rod is about 16cm, and the emarker information parameters of the wire rod are not read by using POWER-Z KM1C. According to the test, the attached USB-C cable supports the maximum charging power of 6W, which can meet the daily charging use of mobile phones, tablets and notebook computers.
Second, the comparison of internal performance
The fast charging protocol determines the universality of the devices supported by the charger, and PDO determines the diversity, while the actual compatibility test is the actual test of fast charging and PDO.
1. fast charging protocol
Xiaomi 65W gallium nitride charger supports many fast charging protocols, such as Apple2.4A, Samsung AFC, Huawei FCP, Qualcomm QC3., QC4+ and PD3., which basically meet the needs of most mobile phones in the market.
Xiaomi 65W also has a complete PDO voltage range, including five fixed voltage ranges of 5V 3A, 9V 3A, 12V 3A, 15V 3A and 2V3.25a. It supports two PPS voltage ranges of 5-11V3A/5-2V3.2A, which can provide good support for PPS-supporting devices.
Xiaomi 55W gallium nitride charger supports Samsung 5V 2A, DCP, QC2., QC3. and PD3. protocols, and has four groups of fixed voltage gears: 5V 3A, 9V 3A, 15V 3A and 2V2.5A. In addition, it also supports Xiaomi private 11V5 private fast charging gear.
Xiaomi 33W gallium nitride charger supports fast charging protocols such as PD, PPS, Apple2.4A, QC2., QC3., QC4+, AFC and FCP. Reading the PDO message of the charger, the measured results show that it supports three fixed PD output gears of 5V 3A, 9V 3A and 12V 2.5A and a group of PPS fast charging gears of 5-11V 3A. In addition, the charger also supports Xiaomi 11V3A private fast charging gear.
2. Charging compatibility
1. Xiaomi 65W
Using Xiaomi 65W gallium nitride charger to charge the 13-inch MacBook Pro, the power reaches about 57W, which is really awesome.
make all data into a compatibility test table, all devices can be charged normally, and USB PD, ChargeTurbo, QC, FCP, AFC and APPLE2.4A devices can shake hands and charge quickly. In addition to the Macbook Pro 13 57W, iPad Air3 and iPad Pro, the power of the two tablets also reached 33W. The power of Xiaomi 9 with 27W ChargeTurbo also reached 26.92W After that, the power of three iPhone 11 series models supporting USB PD fast charging was all above 2W.
Xiaomi 11 is specially taken out, and the power is close to 48W, which is still based on Xiaomi's private protocol, and its usability is extremely high. In other words, Xiaomi 11 users can completely replace or supplement Xiaomi 65W gallium nitride. If the original charger is lost, or the office needs another one, you can directly buy Xiaomi 65W, and the USB-C interface with 65W PD fast charging can not only charge the mobile phone, but also charge many devices such as notebooks and tablets. Why not?
2. Xiaomi 55W
Xiaomi 11 was charged with a 55W gallium nitride charger with a power of 9.1V4.99A44.98W..
put all the test data of Xiaomi 55W into a table. It can be seen that the mobile phone of Xiaomi family performs well, and the power is close to the peak level. The power of Xiaomi 1 Pro is about 46W, and that of Black Shark 3S can also exceed 43W；. IPhone 12 is Five Blessingg Yi 'an; Two iPad with USB-C interface and four laptops are normal; In other Android devices, except the power of one plus 8T is close to 27W, others are lacking.
3. Xiaomi 33W
Use Xiaomi 33W charger to charge Redmi K3 Pro, and the power is 9.42V 3.A 28.33W, which is normal. There is little difference in the charging power between Redmi K3 and K4, and the test results can confirm each other.
summarizing all the test data, Xiaomi 33W gallium nitride charger performs well in supporting fast charging of equipment, especially for Xiaomi, Samsung, Black Shark, Yijia and other mobile phones that support PPS fast charging.
iii. comparison of disassembly
1. Xiaomi 65W gallium nitride charger
The reason why Xiaomi 65W gallium nitride charger can achieve the breakthrough of power density is mainly due to the fact that GaNFast gallium nitride power chips NV6115 and NV6117 with built-in nano semiconductors are matched with Anson NCP5153 and TI UCC2878 to realize high-frequency switching, thus greatly reducing the size of the transformer.
At the same time, the output filter of this charger uses patch capacitor, which further compresses the volume. In terms of compatibility, Cypress' solution is selected, and CYPD3174 has no performance. In addition to the conventional protocol, it can also realize 5W fast charging of Xiaomi 1 Pro.
in terms of heat dissipation, the power device and transformer inside the charger are all designed with heat conducting pads, and the periphery of the whole PCBA module is wrapped with copper plates, which plays a role in uniform heat dissipation. The whole product is made of solid materials and fine workmanship, which can be called a boutique in the charger.
2. Xiaomi 55W gallium nitride charger
The inside of Xiaomi 55W gallium nitride charger is encapsulated into a whole with heat-conducting potting glue, which can improve the waterproofness and heat conductivity of the adapter, and there is no displacement space for components, which plays a role in improving weather resistance, strengthening heat conduction and avoiding local hot spots, and greatly improves the reliability of the adapter.
in addition, a thermistor is placed beside the nano-GaN power device in the charger, and the temperature of the adapter is detected by Anson NCP1343 to protect against overheating, which is rare in the adapter disassembled from the charging head network. It can be seen that Xiaomi is going to build the strongest millet charger.
on the other hand, this charger uses Ansenmei NCP1342 to drive nano NV6115 gallium nitride devices in the primary stage, MPS MP698A to drive Toshiba TPH4R5ANH for synchronous rectification in the secondary stage, and Wei Quan WT6633P is used as the output protocol IC, which has strong performance. The primary stage adopts Fengbin 115 heat-resistant electrolytic capacitor, and the output is filtered by emerald ultra-low impedance solid-state capacitor. The high heat-resistant capacitor ensures the service life and the low impedance solid-state capacitor ensures the output quality. The components are all from the first-line manufacturers, and the potting process is also used, and the quality is worthy of recognition.
3. Xiaomi 33W gallium nitride charger
The charger adopts the popular multi-PCB combined structure design, which can make full use of the internal space. In addition, the PI highly integrated gallium nitride main control chip is adopted, which effectively simplifies the circuit and helps the charger realize miniaturization.
in addition to the main control, it also adopts Bandai synchronous rectifier, Cypress protocol chip and Toshiba VBUS protection tube. The input filter capacitor comes from Ai Hua, and the output is filtered by solid-state capacitor. Thermistors are used to protect against overheating with Cypress 3175, so the overall materials are solid and reliable.
Summary of charging head network
Seeing this, everyone charges Xiaomi's gallium nitride.