<div class="document"> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">注：* 为必填项</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><strong><span style="color:#0093e6;">请在报名阶段填写 ↓</span></strong></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 1、项目功能介绍</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">在实验室环境下，监测电压电流是十分便捷的，通过一些可调电源，配合万用表，或则高端点的监测设备，可以非常便捷的对设备输入输出功耗进行实时监测。然而这些设备体积较为庞大，便携性差，测量方式方法复杂，连线端子单一，为了能够更为方便的在户外对一些设备的功耗进行监测，或在室内对设备功耗进行快速测量，设计了一款可选量程的功耗检测仪，通过焊接不同阻值的电流采样电阻，可以适应高功耗或低功耗设备的测量，此外为了提高低功耗设备的测量精度，设备自带了电池，为测量设备独立供电，可以减小测量误差，提高测量精度。</p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*2、项目属性</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;font-size:14px;">项目首次公开；项目为原创；并未曾获奖；主要参考了国民技术提供的USB电流表案例。</span></p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 3、开源协议</h3> <hr class="horizontal-splitline normal-bold-2"><p>GPL3.0开源</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*4、硬件部分</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;">1. R2与R12电阻只贴一个，电流正向流通则焊接R2，如果是反向供电，则焊接R12，两个电阻不能同时焊接。</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;"><img src="//image.lceda.cn/pullimage/pZKVP5gFQ4hgs8jp3KyUTleoSkqJgCZbMs8cP6eV.png" alt="pZKVP5gFQ4hgs8jp3KyUTleoSkqJgCZbMs8cP6eV.png"></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;">2. </span><span style="color:#95a5a6;">为了调整电流</span><span style="color:#95a5a6;">采样电阻的阻值，</span><span style="color:#95a5a6;">可以选焊电阻</span><span style="color:#95a5a6;">R*。这样做的目的是为了针对不同的电流测量范围。默认的10mΩ电阻R1比较适合大电流测量（最大可达6A），当需要对低功耗设备进行功耗测量时，可以选焊较高阻值的电阻R*，如100mΩ，可以提高小电流的测量精度。</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;"><img src="//image.lceda.cn/pullimage/rlwDSWTuInna73RSn2uQ8Zehu2af8Xxm0LpqU9rx.png" alt="rlwDSWTuInna73RSn2uQ8Zehu2af8Xxm0LpqU9rx.png"></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;">3. 开关SW1用于切换功耗仪的供电，这么做是十分有必要的——它可以避免外接电源的额外电流消耗，并且也能避免外接电源的高电压烧毁功耗仪。当对5V供电的USB设备功耗进行测量时，功耗仪可以直接用TYPE-C口供电，并同时进行供电输出，无需连接VIN+和VIN-；当测量较高供电设备功耗时（电压>6V），需要通过VIN+与VIN-两个端口接入供电，并通过VOUT+与VOUT-进行输出，此时开关SW1需要切换为锂电池供电，以避免设备损坏。</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;"><img src="//image.lceda.cn/pullimage/7SA8ceSVydLXbg0pFtBlznku7m5cG2rMGO8T2mlv.png" alt="7SA8ceSVydLXbg0pFtBlznku7m5cG2rMGO8T2mlv.png"></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;">4. 经测试，最高外接供电电压为30V，这主要是受电压分压采样电阻R10/R11的比例所限。如果你需要更高的电压测量范围的话，可以提高R10/R11的比值，相应的，程序中的电压换算值也需要相应进行修改。</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;">5. 功耗仪右侧额外增加一个IIC接口，可以外接IIC接口的温度采样模块（AHT20），实现环境温度校准的功能，但是这个功能目前并未实现，因为选用的采样电阻基本都是低温漂电阻，并且目前的使用环境并没有恶劣到需要额外的环境温度校准。</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*5、软件部分</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;">完全可以兼容<span style="color:#95a5a6;font-size:14px;">国民技术提供的USB电流表案例中的程序。虽然电路设计上有一些区别，包括供电部分、接口部分、采样电路，以及显示模块选用的是0.96寸OLED，但并不影响显示。程序只针对采样时误差比例进行了微调，可以明显改善较大测量范围的误差。需要说明的是，<span style="color:#95a5a6;">国民技术提供的软件设计里，也使用了内部晶振源，也就是说，无需外接晶振。</span></span></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*6、BOM清单</h3> <hr class="horizontal-splitline normal-bold-2"><table style="border-collapse:collapse;width:579.77pt;" width="773"><tr style="height:13.5pt;"><td style="height:13.5pt;width:25.5pt;" width="34" height="18">No.</td> <td style="width:61.5pt;" width="82">Quantity</td> <td style="width:78.75pt;" width="105">Designator</td> <td style="width:201.75pt;" width="269">Footprint</td> <td style="width:92.25pt;" width="123">Supplier Part</td> <td style="width:120pt;" width="160">Comment</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">1</td> <td>4</td> <td>C1,C3,C6,C9</td> <td>C0603</td> <td>C412628</td> <td>4.7uF</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">2</td> <td>10</td> <td>C2,C4,C5,C7,C8,C10,C11,C12,C13,C14</td> <td>C0603</td> <td>C385971</td> <td>100nF</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">3</td> <td>1</td> <td>CN1</td> <td>CONN-SMD_1251SMT-2P</td> <td>C132528</td> <td>W-1251M02P-0400</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">4</td> <td>2</td> <td>H1,H2</td> <td>电源焊盘</td> <td>C49661</td> <td> </td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">5</td> <td>1</td> <td>H3</td> <td>HDR-TH_4P-P2.54-V-M</td> <td>程序烧写口</td> <td>不焊</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">6</td> <td>2</td> <td>H4,H5</td> <td>HDR-TH_4P-P2.54-V-F</td> <td>显示屏接口/外接IIC口</td> <td>根据需求焊接</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">7</td> <td>1</td> <td>R1</td> <td>R2512</td> <td>C500718</td> <td>0.01Ω</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">8</td> <td>2</td> <td>R2,R12</td> <td>R0603</td> <td>C2909476</td> <td>0Ω</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">9</td> <td>2</td> <td>R3,R4</td> <td>R0603</td> <td>C136596</td> <td>10Ω</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">10</td> <td>2</td> <td>R5,R6</td> <td>R0603</td> <td>C23025</td> <td>300Ω</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">11</td> <td>1</td> <td>R7</td> <td>R0603</td> <td>C23186</td> <td>5.1kΩ</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">12</td> <td>2</td> <td>R8,R9</td> <td>R0603</td> <td>C25804</td> <td>10K</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">13</td> <td>1</td> <td>R10</td> <td>R0603</td> <td>C136946</td> <td>91kΩ</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">14</td> <td>1</td> <td>R11</td> <td>R0603</td> <td>C136139</td> <td>10kΩ</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">15</td> <td>1</td> <td>R*</td> <td>R2512</td> <td>C500718</td> <td>0.1Ω</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">16</td> <td>1</td> <td>SW1</td> <td>SW-SMD_JS202011JAQN</td> <td>C221664</td> <td>JS202011JAQN</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">17</td> <td>1</td> <td>U1</td> <td>SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR</td> <td>C82942</td> <td>ME6211C33M5G-N</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">18</td> <td>1</td> <td>U2</td> <td>MSOP-10_L3.0-W3.0-P0.50-LS5.0-BL</td> <td>C99652</td> <td>CH340E</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">19</td> <td>1</td> <td>U3</td> <td>SC-70-6_L2.2-W1.3-P0.65-LS2.1-BR</td> <td>C59135</td> <td>INA199A1DCKR</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">20</td> <td>1</td> <td>U4</td> <td>LQFP-48_L7.0-W7.0-P0.50-LS9.0-BL</td> <td>C3032170</td> <td>N32G430C8L7</td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">21</td> <td>2</td> <td>U5,U6</td> <td>短接端</td> <td>无需焊接</td> <td> </td> </tr><tr style="height:13.5pt;"><td style="height:13.5pt;" height="18">22</td> <td>1</td> <td>USB1</td> <td>USB-C-SMD_TYPE-C16PIN</td> <td>C393939</td> <td>TYPE-C16PIN</td> </tr></table><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*7、大赛LOGO验证</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">通过和电源分析仪的测量数据对比可以发现，功耗仪的测量精度较高，电压误差平均在1.2%，电流误差平均在1%左右。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/TQUJagucP7RWo5Bd6LiYWLkJn9yVrP1B17pt9KA3.png" alt="TQUJagucP7RWo5Bd6LiYWLkJn9yVrP1B17pt9KA3.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/X9LJJNkQxJ0ho5SmYry0mYcH8kEH7jsSUQb3VVDM.png" alt="X9LJJNkQxJ0ho5SmYry0mYcH8kEH7jsSUQb3VVDM.png" width="508" height="500"><img src="//image.lceda.cn/pullimage/oDiIxkSbaXQCFDnz3kdGGdoCg8OoQxHAlBPQAxZ6.png" alt="oDiIxkSbaXQCFDnz3kdGGdoCg8OoQxHAlBPQAxZ6.png" width="490" height="500"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><strong><img src="//image.lceda.cn/pullimage/fDHtm7VQyWF0ryKhYhbS8PZIrQ1iqcUaDpgBNTCK.png" alt="fDHtm7VQyWF0ryKhYhbS8PZIrQ1iqcUaDpgBNTCK.png"><img src="//image.lceda.cn/pullimage/4c1ZBijXXIXBmxUJjihj6L8b9NKt0NdTuVUbVIid.png" width="493" height="344" alt="4c1ZBijXXIXBmxUJjihj6L8b9NKt0NdTuVUbVIid.png"></strong></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/xGRwk0Njn7Rul2PXHvNeCRBRKFps3QpBkYQfS9dk.png" alt="xGRwk0Njn7Rul2PXHvNeCRBRKFps3QpBkYQfS9dk.png" width="454" height="333"><img src="//image.lceda.cn/pullimage/EXp24YM2U2gtF5pi005fK9VrP4W7kjcGnrh74koC.png" alt="EXp24YM2U2gtF5pi005fK9VrP4W7kjcGnrh74koC.png" width="337" height="335"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/xDFHxw7wbBUQ34JxWkhkrPmIr5LPqGOkHmbHCLdc.png" alt="xDFHxw7wbBUQ34JxWkhkrPmIr5LPqGOkHmbHCLdc.png" width="534" height="465"></p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 8、演示您的项目并录制成视频上传</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> </div>