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一 | KAMPALA, Uganda -- Jostling for space, people jam the crowded footpaths crisscrossing a massive open market in Uganda's capital. They are mostly looking for secondhand clothing, sifting through underwear for pairs that seem new or trying on shoes despite getting pushed around in the crush.Downtown Kampala’s Owino Market has long been a go-to enclave for rich and poor people alike looking for affordable but quality-made used clothes, underscoring perceptions that Western fashion is superior to what is made at home. Discarded by Europeans and Americans, these clothes are often purchased from wholesalers and then shipped to African countries by middlemen. It's a multimillion-dollar business, with some two-thirds of people in seven countries in East Africa having “purchased at least a portion of their clothes from the secondhand clothing market,” according to a 2017 U.S. Agency for International Development study, the most recent with such details.Despite the popularity, secondhand clothes are facing increasing pushback. Ugandan President Yoweri Museveni, a semi-authoritarian leader who has held power since 1986, declared in August that he was banning imports of used clothing, saying the items are coming “from dead people.” “When a white person dies, they gather their clothes and send them to Africa,” Museveni said.Trade authorities have not yet enforced the president’s order, which needs to be backed by a legal measure such as an executive order. Other African governments also are trying to stop the shipments, saying the business amounts to dumping and undermines the growth of local textile industries. The East African Community trade bloc — consisting of Burundi, Congo, Kenya, Rwanda, South Sudan, Tanzania and Uganda — has recommended banning imports of used apparel since 2016. However, member states have not enforced it at the same pace amid pressure from Washington. In Uganda, the president's order has spread panic among traders, for whom such a ban, if implemented, spells disaster. They hawk used clothes in scores of large open-air markets across the country of 45 million people, at roadside stands and even in shops in malls where it’s possible to buy secondhand clothes marketed as new.The clothes are cheap and drop further in price as traders make room for new shipments: a pair of denim jeans can go for 20 cents, a cashmere scarf for even less.At one of Uganda’s Green Shops, a chain specializing in used clothes, apparel reseller Glen Kalungi shopped for items his customers might want: vintage pants for men and cottony tops for women.“I am a thrift shopper,” he said. “I usually come to these Green Shops to check out clothes because they have the best prices around town.”Kalungi likes to visit on clearance days when he can buy clothes for a fraction of a dollar. Then he sells them at a profit.The chain, whose owners include Europeans, unveils new clothes every two weeks at its three stores. Some of the items are sourced from suppliers in countries including China and Germany, retail manager Allan Zavuga said.“How they collect the clothes, we are not aware of that,” Zavuga said of their suppliers. “But (the clothes) go through all the verification, the fumigation, all that, before they are shipped to Uganda. And we get all documents for that.”The Green Shops are environmentally friendly because they recycle used clothes in bulk, he said.The association of traders in Kampala, known by the acronym KACITA, opposes a firm ban on used apparel, recommending a phased embargo that allows local clothing producers to build capacity to meet demand.Some Ugandan apparel makers, like Winfred Arinaitwe, acknowledge that the quality of locally made fabric is often poor. Not surprisingly, many people would rather buy used clothing, she said. "Because it lasts longer,” she said. “It can easily be seen.”In Owino Market, a ban on used clothes is inconceivable to many, including some who say they don't think the president’s threat was serious.Abdulrashid Ssuuna, who tries to persuade customers in the market to stop by his brother’s used clothing business, said a ban would deny him a livelihood.“It’s like they want to chase us out of the country,” he said of the president’s order. “From these old clothes, we get what to eat. If you say we leave this business, you are saying we go into new clothes. But we can’t afford to go there.”Ssuuna approaches people in Owino Market to urge them to visit the stall where his brother sells used jeans. The market is aggressively competitive, with merchants sitting behind heaps of clothes and shouting words of welcome to possible customers.If he helps his brother sell clothing, “I get something,” said Ssuuna, who started this work after dropping out of high school in 2020.The market is always full of shoppers, but business is unpredictable: Traders must try to anticipate what customers are looking for before they are lured by other sellers. Some days are better than others, said Tadeo Walusimbi, who has been a used-clothes trader for six years. A government ban is simply untenable, he warned. It “will not work for me and for so many people,” Walusimbi said.。

二 | 大疆100W桌面快充外观大疆这款100W桌面快充自带电源线，不过采用线体分离设计，可以灵活进行更换，适配地区更广。电源线两端分别为双脚美规和8字插头。测得电源线长度约为71cm。充电器机身方块造型，外壳磨砂抗指纹，正背面边缘均倒角处理。正面中心设计有DJI品牌。背面印有产品参数型号：CDX265-100输入：100-240V~50/60Hz 2.5AUSB-C1/C2输出：5V3A、9V5A、12V5A、15V5A、20V5A、5-20V5AC1/C2：100W MaxC1/C2+C2/C1：82W+18W制造商：深圳欧陆通电子股份有限公司产品由深圳市大疆创新科技有限公司授权生产充电器通过了CCC、CE、UL、UKCA认证。机身一端设有8字输入插口，独立模块设计。另一端设有两个USB-C接口，接口边缘倒角亮面设计，并印有区别标识。

三 | 测得机身长度为73.67mm。

四 | 宽度为70.12mm。厚度为32.37mm。和苹果96W充电器对比，整体小一圈。充电器拿在手上的大小直观感受。另外测得其重量约为278g。

五 | 使用ChargerLAB POWER-Z KM002C测得USB-C1口支持FCP、SCP、AFC、QC3.0、PD3.0、PPS、QC5、Apple2.4A、Samsung 5V2A充电协议。

六 | PDO报文显示C1口还具备5V3A、9V5A、12V5A、15V5A、20V5A五组固定电压档位，以及5-20V5A一组PPS电压档位。测得USB-C2口兼容协议和C1口的一样。PDO报文也一样，即两个接口单口输出性能一样，支持功率盲插。大疆100W桌面快充拆解看完了大疆这款100W充电器的外观和测试，下面就进行拆解，看看内部的设计和用料。沿外壳接缝拆开充电器外壳，内部PCBA模块采用纯铜片包裹散热，与外壳之间打胶固定并使用外壳散热。纯铜散热片通过卡扣固定成为一个整体，包裹PCBA模块。电源输入插座通过导线焊接连接到PCBA模块上。

七 | 散热片内部通过麦拉片与PCBA模块绝缘。

八 | 散热片通过焊接连接到PCBA模块。使用游标卡尺测得PCBA模块长度约为67.9mm。PCBA模块宽度约为64.32mm。PCBA模块厚度约为27.61mm。拆下PCBA模块两面的纯铜散热片，散热片内部粘贴胶带绝缘，PCBA模块包裹麦拉片绝缘。正面元件打黑色导热胶固定及散热，输出降压小板与高压元件之间插入一片麦拉片绝缘。背面也涂有导热胶为发热元件散热。

九 | 交流输入导线冷压端子焊接，外套热缩管绝缘。

十 | PCBA模块正面一览，其中右上角为输入滤波器件，右侧下方为PFC升压电感，在升压电感下方为高压滤波电容，左侧为LLC变压器，在变压器与高压滤波电容之间是谐振电感。

十一 | 下方为降压小板，焊接降压电路和USB-C母座。PCBA模块背面焊接一颗PFC+LLC二合一控制器，PFC开关管，PFC整流管，LLC开关管和次级同步整流电路。

十二 | 电源模块固定电压输出，为二次降压小板供电。通过对充电器PCBA模块的观察，大疆100W充电器采用PFC+LLC开关电源架构，采用NXP恩智浦电源方案，PFC电路使用镓未来氮化镓开关管，下面我们就从输入端开始，了解各个器件的信息。电源输入端一览，焊接滤波电路，整流桥，EMI滤波电路，NTC热敏电阻和保险丝。输入端保险丝规格为5A 250V。第一级共模电感采用绝缘线和漆包线绕制，底部固定绝缘支架。安规X2电容来自SCC实全电子，规格为0.33μF。NTC热敏电阻串联在电路中，用于抑制上电时的浪涌电流。

十三 | 第二级共模电感采用铜带绕制，底部焊接绝缘支架，并缠绕胶带绝缘。整流桥固定一片纯铜散热片用于散热。侧面焊接降压小板，高压滤波电容，PFC升压电感和滤波电容及滤波电感。整流桥输出的脉动直流电通过薄膜电容与磁环电感组成的滤波电路滤波。

十四 | 两颗薄膜电容规格均为0.47μF 400V。磁环电感采用胶带缠绕绝缘。充电器初级PWM主控芯片采用NXP恩智浦TEA2016AAT，一颗芯片内置LLC控制器和PFC控制器，内置数字架构控制，简化了设计的同时减少外围元件数量，芯片内置多重完善的保护功能，集成度非常高。

十五 | 为主控芯片供电的电解电容规格为47μF 50V。PFC升压开关管来自镓未来，型号为G1N65R240PB，是一颗耐压650V的氮化镓功率器件，标称导阻240mΩ，栅极耐压支持±18V，可使用传统硅MOS驱动，相比增强型氮化镓，大大简化栅极驱动电路设计。

十六 | 镓未来G1N65R240PB规格资料。充电头网了解到，镓未来氮化镓功率器件此前已被铁甲65W氮化镓无线智能充电器、绿巨能65W三口氮化镓快充充电器、悦米65W 1A1C氮化镓快充充电器、唯沃丰65W 2C1A氮化镓快充充电器等产品采用。

十七 | 用于检测PFC开关电流的取样电阻，采用2512封装，阻值为75mΩ。PFC升压电感采用ATQ24磁芯。PFC升压开关管来自瑞能，型号BYV29D-600P，是一颗超快恢复二极管，耐压600V，正向电流9A，采用TO252封装。高压滤波电解电容来自Chengx承兴，其中三颗规格为18μF420V。另外一颗规格为27μF420V，总容量为81μF。LLC开关管来自东微，型号OSG65R360GEF，是一颗耐压700V的NMOS，导阻为360mΩ，采用DFN5*6封装。另一颗开关管型号相同，两颗组成半桥。谐振电容规格为0.033μF 630V。谐振电感采用ATQ17磁芯。变压器采用ATQ2716磁芯，缠绕高温胶带绝缘。贴片Y电容来自禾伸堂，两颗串联提高耐压等级，三组串联共使用六颗。CT1018光耦用于输出电压反馈。次级同步整流控制器采用恩智浦TEA1995T，其内置两个驱动器用于LLC架构开关电源的同步整流，外围元件精简。同步整流管来自维安，型号WMB060N06L，是一颗耐压80V的NMOS，导阻4.3mΩ，采用PDFN5060封装。另一颗同步整流管型号相同。输出滤波固态电容规格为1000μF 25V。输出侧小板焊接两路降压电路用于双口输出。

十八 | 输出滤波电感采用磁环绕制，底部胶水固定电木板绝缘。

十九 | USB-C降压小板正面特写，焊接两颗降压电感以及四颗输出滤波电容。USB-C降压小板背面特写，焊接一颗协议芯片，两颗降压控制器，降压开关管和VBUS开关管。协议芯片采用英集芯IP2738，两个接口输出均由其控制。IP2738是一颗双路协议芯片，支持双口18-140W快充应用，具备独立的反馈控制，具备独立的USB PD控制，相当于两颗IP2736整合到一颗芯片内部，快充规格与IP2736相同。

| 支持USB PD3.1 28V EPR档位，并支持PD3.0/PPS等丰富全面的快充协议，兼容性非常好。英集芯IP2738内置四路独立的NMOS驱动，可用于多个接口输出控制，控制多个VBUS开关管进行输出端口切换以及两路电源并联控制，并且支持双路独立的过流、过压以及短路保护，确保使用安全。充电头网了解到，英集芯IP2738此前已被麦多多40W双USB-C氮化镓充电器、爱兰博140W 2C1A氮化镓充电器、安克65W 2C1A二合一氮化镓超极充、绿联140W 2C1A氮化镓充电器，英集芯的其它系列快充芯片已被小米、华为、三星等大品牌的产品使用，性能质量获得客户的高度认可。英集芯IP6550同步降压控制器支持5A输出电流，内置的同步降压控制器开关频率固定135kHz。可用于两路USB-A口，也可作为单路降压使用，输出电压可调满足更多场合应用。IP6550内置输入过压、欠压保护，内置输出过流、过压、欠压及短路保护，芯片内部集成过热保护，并支持EN控制开关。IP6550可用于车载充电器、多口适配器、智能插排、支持USB-C接口的插排以及行车记录仪应用。同步整流降压具有高转换效率，高输出电流可用于多口5V输出，搭配PD协议芯片可实现宽范围电压调节，满足USB PD3.1的应用。用于二次降压和VBUS开关管均丝印B3006，为NMOS管，左侧两颗为输出VBUS开关管，右侧两颗由IP6550控制进行同步降压。

| 另外一颗输出口同样采用IP6550进行降压控制。降压开关管与VBUS开关管型号相同。全部拆解完毕，来张全家福。充电头网拆解总结大疆这款双口氮化镓充电器采用分体线缆设计，有效适配不同长度应用。充电器具备100W输出功率，支持单口100W输出，双口均支持100W输出功率。实际测试充电器支持5-20V 5A PPS快充，可以满足手机和笔记本电脑的充电需求。充电头网通过拆解了解到，大疆这款100W氮化镓充电器采用PFC+LLC+DC-DC的架构设计，PFC使用镓未来氮化镓功率芯片配合瑞能二极管整流，LLC采用两颗东微的MOS管组成半桥。

| 输出使用两颗维安的低压MOS管用于同步整流，电源初级主控芯片和同步整流控制器均来自NXP恩智浦。

| 开关电源采用固定电压输出，输出采用二次降压电路，由英集芯IP2738协议芯片控制两路IP6550同步降压控制器进行降压输出，满足两路独立的快充输出。充电器内部电解电容来自承兴，输出全部使用固态电容，纹波更低，寿命更长。

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