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一、QC 2.0介绍 1、美国高通公司（QUALCOMM）成立于1985年7月，是一家专专业手机芯片的公司，目前市场上的手机芯片高通占有率最高，在手机芯片上与联发科、三星、华为、APPLE有一定竞争关系。 2、什么是QC2.0？这个协议是高通2014年出的针对充电所制定出来的一种规范，分class A(5V,9V,12V) class B(5V,9V,12V,20V)两种，也是利用D＋D﹣电压的变化来控制充电器的输出电压，目前大部份都是class A。 另外，早期也有QC1.0版本，但功率相对较小，如下图所示：
二、工作原理 1、利用MOS管高速开关的S1和电感L来使输入电压降低到电池电压。并在测量、反馈控制部分调控下控制充电电流。这个电路的输出电流和电压与输入电流和电压的关系可以能量守恒定律求得：输入电压*输入电流*效率=输出电压*输出电流。（PS：这里的输出为电压*电流，为什么要提高电压呢，两方面考虑：A、一是可以减小电流的情况下同样达到一样的功率甚至更高的功率。B、适当提高电压可以增大输出功率。）
2、现在新型手机中，这个效率可以达到90%以上。正是利用了这种开关变换电路，QC 2.0能将输入的高电压和较小的电流转换为电池的电压和较大的充电电流。
3、高通QC 2.0握手协议
QC 2.0快充的充电器与手机通过micro USB接口中间两线（D+D-）上加载电压来进行通讯，调节QC 2.0的输出电压。
三，到底会不会损坏设备？ 当采用这种设计的智能机若是改用较大电流的USB充电器，就会烧坏内部电子开关，会不会造成手机故障？ 1、是不是所有的手机都可以用QC2.0的充电器？可以的，手机99﹪都是5V输出，QC2.0的充电器默认5V输出，只是不会有快速充电的效果。 2、充电速度的比较，以5V为基准，9V约1.8倍，12V约2.4倍。举例来说，高通实验室测出来的结果以一台平板来说，原本需要7小时充满，现在缩短至3小时，整整提高75﹪ 3、重点说明，发出充电模式指令的永远是手机和平板，充电器本身是按照协议来做的，充电器本身是没有控制权的，一切都是手机和平板等被充电方为主导，理论上说你用大电流或者大电压的充电器同样不会损坏您的设备，当然强烈建议使用原装充电器或者有相关明确兼容标识的进行充电。
Test & Certification Application Submission Process 1. Customer contacts Qualcomm directly regarding Trademark Agreement and Brand Guidelines 2. Customer submits Test and Certification application to UL 3. UL provides quote for Test and Certification services 4. Qualcomm reviews customer status ***to be clarified*** 5. Upon acceptance UL can proceed with testing 6. Upon completion product will be listed on Qualcomm web site
Marketing rights granted by Qualcomm upon: • Successful compliancy Testing and Certification (via UL) • Execution of Quick Charge 2.0 Trademark Agreement (via Qualcomm) • Acceptance of Quick Charge 2.0 Brand Guidelines (via Qualcomm)
Listing Information Products will be listed on web site after successful completion, in one of the following two Listing Categories
Chipsets, Reference Designs and Modules • Purpose is to show OEMs that Chipset / Reference Design / Module can meet QC 2.0 requirements when incorporated into end product • Qualcomm will administer limited Logo use agreement for promotional purposes
End Products • Qualcomm will administer full Logo use agreement requiring placement of Icon on End Product
Chipsets, Reference Designs and Modules • Documentation o Datasheet or similar showing  Identification as Class A or Class B charger  Class A = 5 / 9 / 12 Volts  Class B = 5 / 9 / 12 / 20 Volts  Rated output current at each output voltage o For Reference Designs and Modules  Identify the IC chip that performs HVDCP detection • Provide one sample for testing • UL will provide Test Report and Chipset Verification to both the customer and Qualcomm
• Global pricing o US $1000 for Testing and Report o US $100 for Verification Listing o US $250/hour for Debugging NOTE: Fees above assume a single pass of tests executed with no failures. If failures are found or re-testing is needed, debug services can be provided at the prevailing hourly rate.
End Products • Documentation o Datasheet or similar showing  Identification as Class A or Class B charger  Class A = 5 / 9 / 12 Volts  Class B = 5 / 9 / 12 / 20 Volts  Rated output current at each output voltage o Identify the IC chip that performs HVDCP detection o Schematic o Bill Of Materials (BOM) o PC Board layout o Scale drawing or photo of Icon o Drawing or photo showing location of Icon on Product • Provide one sample for testing • UL will provide Test Report and End Product Certification to both the customer and Qualcomm
• Global pricing o US $1000 for Testing and Report o US $250 for Certification Listing o US $250/hour for Debugging NOTE: Fees above assume a single pass of tests executed with no failures. If failures are found or re-testing is needed, debug services can be provided at the prevailing hourly rate.
Technical Landscape • Qualcomm QC 2.0 technology decreases the charge time for mobile devices by 40% to 75% while maintaining the plug-and-play ease of use of USB connectors • Conventional USB Charging o 1 A at 5 V provides 15 W • QC 2.0 High Voltage Charging over USB o Up to 3 A at 20 V provides up to 60 W
Industry Standards Environment • High Voltage Dedicated Charging Port (Quick Charge 2.0) is a proprietary technology developed and managed by Qualcomm • Qualcomm controls usage of the QC 2.0 Logo
Testing and Certification: http://industries.ul.com/blog/qualcomm-quick-charge-2-0 | 
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