开关电源类产品电压信号测量与绝缘性能评估方法研究
发布时间：2018-08-29 19:30
【摘要】：当今社会,信息技术设备已成为人们日常生活中必不可少的工具。如手机、平板电脑、机顶盒、打印机、复印机等产品都是我们工作生活中最常接触的产品。但是,信息技术设备由于不符合标准要求而发生的安全事故的事例屡见不鲜。目前,我国已参照安全强制性标准GB4943.1-2011《信息技术设备安全第1部分:通用要求》对此类产品的安全进行强制性检测。这些产品通常都采用开关电源供电,实际测试中,电源往往是重中之中。电源中的工作电压是信息技术设备安全性能检测的重要指标之一。在检测标准GB4943.1-2011中,工作电压是指设备在其额定电源电压下按正常使用条件工作时,所考虑的绝缘承受到的或能承受的最高电压,即有效值工作电压是指包括任何直流分量的工作电压的有效值;峰值工作电压是指包括任何直流分量和设备内产生的任何重复性峰值脉冲电压。确定工作电压是为判定产品的有关安全绝缘性能,如产品的抗电强度,电气间隙以及爬电距离等。如果工作电压测量不准确,会直接导致设备的绝缘设计中产生诸多安全隐患。信息技术类设备通常使用开关电源来供电的,因为高频开关变压器的工作特点,通常会有开关电源中初、次级间的真实工作电压大于产品额定输入的电压值,或者某个产品的实现特定功率要求使用高压输出等状况,所以,产品工作电压的确定是非常关键的。然而,由于检测标准GB4943.1-2011中对于工作电压的测量描述简单概括,各个实验室有不同的理解,使得工作电压的测量在同一型号电源产品中数据差距较大。本文以开关电源类产品为测验对象,介绍其基本情况,考虑在开关电源类产品工作电压检测时,因电源的L/N极性、TN-S供电网络、示波器接地、示波器探头的选取、示波器信号耦合形式和信号收集形式、波形不同的电压有效值和仪器输入阻抗、初次极共电位的选取、负载状态等因素对测试结果的影响。在确定了工作电压的波形及数值后,先从标准理解的角度对工作电压定义内容做出理解,然后结合实例开关电源产品来评估绝缘参数(抗电强度、电气间隙和爬电距离等。)
[Abstract]:Nowadays, information technology equipment has become an indispensable tool in people's daily life. Products such as mobile phones, tablets, set-top boxes, printers, photocopiers are the most common products in our working lives. However, information technology equipment due to non-compliance with the requirements of the security incidents are common. At present, our country has carried on the mandatory inspection to the safety of this kind of products according to the mandatory security standard GB4943.1-2011 < Information Technology equipment Safety part 1: general requirements >. These products are usually supplied by switching power supply, the actual test, power supply is often in the heavy. The working voltage in the power supply is one of the important indexes of the information technology equipment security performance test. In the detection standard GB4943.1-2011, working voltage is the maximum voltage that the insulation is or can withstand when the device works under its rated power supply voltage under normal operating conditions. The RMS working voltage refers to the effective value of the working voltage including any DC component, and the peak working voltage refers to any repetitive peak pulse voltage generated by any DC component and equipment. The working voltage is determined to determine the safety insulation properties of the product, such as electrical strength, electrical gap and creeping distance. If the working voltage measurement is not accurate, it will directly lead to many hidden dangers in the insulation design of the equipment. Information technology equipment usually uses switching power supply, because of the working characteristics of high frequency switching transformers, there is usually a switching power supply between the actual operating voltage higher than the product rated input voltage value, Or the realization of a certain product requires the use of high-voltage output and so on, so the determination of the working voltage of the product is very important. However, because of the simple description of the measurement of working voltage in GB4943.1-2011, different laboratories have different understandings, which makes the measurement of working voltage differ greatly in the same type of power supply products. In this paper, taking switching power supply products as the test object, the basic situation is introduced, considering the selection of the TN-S power supply network, the earthing of oscilloscope, and the probe of oscilloscope during the working voltage detection of switching power supply products, due to the L / N polarity of the power supply, the TN-S power supply network. The effects of oscilloscope signal coupling and signal collection, voltage RMS with different waveforms and input impedance of the instrument, the selection of initial polarity co-potential and load state on the test results are discussed. After determining the waveform and value of the working voltage, the definition of the working voltage is understood from the perspective of standard understanding, and then the insulation parameters (electrical strength, electrical gap, creeping distance, etc.) are evaluated with the example of switching power supply products.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN86;TM935.3
本文编号：2212187
[Abstract]:Nowadays, information technology equipment has become an indispensable tool in people's daily life. Products such as mobile phones, tablets, set-top boxes, printers, photocopiers are the most common products in our working lives. However, information technology equipment due to non-compliance with the requirements of the security incidents are common. At present, our country has carried on the mandatory inspection to the safety of this kind of products according to the mandatory security standard GB4943.1-2011 < Information Technology equipment Safety part 1: general requirements >. These products are usually supplied by switching power supply, the actual test, power supply is often in the heavy. The working voltage in the power supply is one of the important indexes of the information technology equipment security performance test. In the detection standard GB4943.1-2011, working voltage is the maximum voltage that the insulation is or can withstand when the device works under its rated power supply voltage under normal operating conditions. The RMS working voltage refers to the effective value of the working voltage including any DC component, and the peak working voltage refers to any repetitive peak pulse voltage generated by any DC component and equipment. The working voltage is determined to determine the safety insulation properties of the product, such as electrical strength, electrical gap and creeping distance. If the working voltage measurement is not accurate, it will directly lead to many hidden dangers in the insulation design of the equipment. Information technology equipment usually uses switching power supply, because of the working characteristics of high frequency switching transformers, there is usually a switching power supply between the actual operating voltage higher than the product rated input voltage value, Or the realization of a certain product requires the use of high-voltage output and so on, so the determination of the working voltage of the product is very important. However, because of the simple description of the measurement of working voltage in GB4943.1-2011, different laboratories have different understandings, which makes the measurement of working voltage differ greatly in the same type of power supply products. In this paper, taking switching power supply products as the test object, the basic situation is introduced, considering the selection of the TN-S power supply network, the earthing of oscilloscope, and the probe of oscilloscope during the working voltage detection of switching power supply products, due to the L / N polarity of the power supply, the TN-S power supply network. The effects of oscilloscope signal coupling and signal collection, voltage RMS with different waveforms and input impedance of the instrument, the selection of initial polarity co-potential and load state on the test results are discussed. After determining the waveform and value of the working voltage, the definition of the working voltage is understood from the perspective of standard understanding, and then the insulation parameters (electrical strength, electrical gap, creeping distance, etc.) are evaluated with the example of switching power supply products.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN86;TM935.3
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