Sturdy on Suppression of Input Current Harmonics in Switching Power Supplies

目前，开关电源在电子和电气系统中得到了广泛的应用，引起了输入电流谐波干扰。为此，国际电工委员会（IEC）、日本国际贸易和工业部等都提出了有关输入电流谐波干扰的指导方针。因此，对输入电流谐波的抑制与低频区电磁兼容问题一样，成为社会关注的问题之一。另一方面，提高开关电源的功率效率，利用电子和电气系统节约电能，是另一个重要的社会问题之一。从解决上述两个问题的角度出发，研究和开发了新型变换器和逆变器。因此，我们开发了逆变器作为荧光灯的电子镇流器，软开关转换器，有源滤波器和它们的数字控制器使用数字信号处理器。对所提出的逆变器和变换器进行了面向设计的分析。在输入电流谐波方面，所设计的逆变器和变换器效率高，分别满足IEC 61000 C类和IEC 61000 D类要求。此外，在控制电路中采用数字信号处理器，可以实现0.99的高功率因数和1%的低输入电流总谐波畸变。

Nowadays, input current harmonic interferences are caused by switching power supplies, which have been widely used in the electronic and electric systems. For this reason, the International Electrotechnical Commission (IEC), the Ministry of International Trade and Industry of Japan and so forth indicate the guideline with respect to input current harmonic interferences. Thus, the suppression of the input current harmonics is one of the social problems as the electromagnetic compatibility in the low frequency region. On the other hand, it is one of the other important social problems to increase the power efficiency of the switching power supplies and to save the electric energy in case of making use of the electronic and electric systems.From the view point of solving the above two problems, novel types of converters and inverters have been researched and developed. As a result, we developed the inverter as an electronic ballast for fluorescent lamps, soft-switching converter, active filter and their digital controller using the digital signal processor. The design-oriented analysis of the proposed inverter and converter was performed. With respect to input current harmonics, the proposed inverters and converters, which have high efficiency, satisfy the IEC 61000 Class C and IEC 61000 Class D, respectively. Furthermore, using the digital signal processor in the control circuit, high power factor of 0.99 and low total harmonic distortion of 1% in the input current can be achieved.