Measurements of radiation emission of a portable power bank with a capacity of 5200 mAh

The dataset contains the emission measurement results that are part of comprehensive tests carried out for portable power banks with different capacities. The measurements were performed in the frequency range from 30 MHz to 3 GHz using a Gigahertz Transverse Electromagnetic (GTEM) cell. The test setup was configured to measure a portable power bank for various modes of operation. The data represents emission test results for a portable power bank with a capacity of 5200 mAh, consisted of rechargeable lithium-ion batteries installed in a protective cover, guided by a printed circuit board with DC-DC converter based on pulse frequency modulation technology. The basic parameters of the examined power bank are input and output rating of DC 5V, 1000 mA, mini USB input port, and single USB output port. Radiated emissions measurements of electrical and electronic devices are carried out under the requirements set out in the standards of electromagnetic compatibility (EMC). The standard environment for emission measurements in the frequency range from 30 MHz to 3 GHz is the OATS (Open Area Test Site). A GTEM cell is an alternative measurement method, which allows evaluating the radiated EMC interference emitted from small electrical and electronic equipment. The results of the measurements carried out in the GTEM cell are the basis for the estimation of an equivalent OATS field strength. The comprehensive tests were performed for different cases in charge and discharge mode, respectively (Fig. 1). In a discharging condition, the power bank was connected to an 8-bit AVR microcontroller or a typical smartphone. The power bank was coupled to a USB power adapter by a shielded USB cable of 80 cm in length. During working with loads, the power bank was connected to a microcontroller and a smartphone by a shielded USB cable of a length equal to 80 cm and 30 cm respectively. The emission test was also performed when the power bank was in standby mode for two cases; with and without a USB cable. The measurement results reported undesirable effects related to the power bank’s operation. It was shown that the higher intensity of the electric field strength was caused by the tested power bank as well as devices connected to it. Tests proved that the examined power bank is characterized by the undesired EMC properties in standby mode with the USB cable connected as well. The attached dataset contains files described as follows: EMI Report_capacity_mode of operation.Mode of operation: standby mode, without the USB cable, discharge mode 2_1. a power bank connected to the Atmel ATmega328/P microcontroller, 2_2. a power bank connected to the smartphone Samsung J3, charge mode, a power bank connected to an AC mains outside or inside of the GTEM cell , standby mode, with the USB cable 4_1. a long cable, 4_2. a short cable, 4_3 a different arrangement of a long cable. Additionally, a file EMI Report_surroundings.pdf containing the results of the measurements carried out with the GTEM door open without the power bank was attached. EMI Report includes a hardware setup, EMI Auto Test Template, a spectrum of the radiated emission of the power bank in the OATS and on the GTEM cell’s output, and the final results of spectral components of the emission spectrum. Figure 1. Block diagram of a test operation modes, charging (a), discharging (b) and standby (c), respectively.本数据集收录了针对不同容量便携式移动电源开展的综合测试中的电磁辐射测量结果。本次测量在30 MHz至3 GHz的频率范围内开展，采用吉赫兹横电磁波室（Gigahertz Transverse Electromagnetic, GTEM）作为测试环境。本次测试配置针对不同工作模式的便携式移动电源开展辐射测量。 本数据集收录的测试结果来自一款标称容量5200 mAh的便携式移动电源：该电源采用可充电锂离子电池作为储能单元，封装于防护外壳内，搭载基于脉冲频率调制（Pulse Frequency Modulation, PFM）技术的DC-DC转换器（DC-DC converter）的印刷电路板实现电路管控。该受试移动电源的基本参数为：直流输入输出额定规格均为DC 5V、1000 mA，配备mini USB输入接口与单个USB输出接口。 电气电子设备的辐射发射测量需符合电磁兼容性（Electromagnetic Compatibility, EMC）相关标准要求。针对30 MHz至3 GHz频段的发射测量，标准测试环境为开阔场（Open Area Test Site, OATS）。吉赫兹横电磁波室是一种替代测试方案，可用于评估小型电气电子设备产生的辐射电磁兼容干扰。基于吉赫兹横电磁波室的测量结果可用于估算等效开阔场场强。 本次综合测试分别针对充电、放电两种工作模式开展多组工况实验（见图1）。放电工况下，受试移动电源分别连接至8位AVR微控制器或主流智能手机；当受试移动电源接入USB电源适配器时，采用长度为80 cm的屏蔽USB线缆进行连接。带载工作工况下，受试移动电源分别通过长度为80 cm与30 cm的屏蔽USB线缆连接至微控制器与智能手机。 本次测试同时覆盖移动电源处于待机模式的两种工况：连接USB线缆与未连接USB线缆。测量结果显示受试移动电源运行过程中存在不良电磁效应。实验表明，受试移动电源及其外接设备均会产生较高强度的电场信号。测试结果证实，当待机模式下连接USB线缆时，受试移动电源同样存在不符合电磁兼容要求的性能表现。 本数据集附带的文件分为两类：一类为命名格式为"EMI Report_capacity_mode of operation"的文件，涵盖以下工作模式的测试数据： - 待机模式（未连接USB线缆） - 放电模式： 2_1. 移动电源连接Atmel ATmega328/P微控制器 2_2. 移动电源连接智能手机Samsung J3 - 充电模式：移动电源通过吉赫兹横电磁波室内外的交流市电供电 - 待机模式（连接USB线缆）： 4_1. 长线缆（80 cm） 4_2. 短线缆（30 cm） 4_3. 长线缆不同布设方式 此外，数据集还附带"EMI Report_surroundings.pdf"文件，该文件收录了吉赫兹横电磁波室舱门开启且未接入受试移动电源时的测量结果。所有EMI报告文件均包含硬件搭建方案、EMC自动测试模板、受试移动电源在开阔场与吉赫兹横电磁波室输出端的辐射发射频谱，以及发射频谱各频谱分量的最终分析结果。 图1 测试工作模式框图：(a)充电模式，(b)放电模式，(c)待机模式。