Abstract: A power assembly apparatus includes a capacitor module, a power module and at least one heat sink. The capacitor includes interconnected direct current (DC) capacitor banks and a capacitor bus. The capacitor bus has a connection part. The power module has an input bus, an output bus, and three single-phase switching tube groups. Each single-phase switching tube group includes a plurality of switching modules. Each switching module is coupled to input tubes and output tubes. The input bus is connected to the connection part. The output bus is configured to output electrical energy. The heat sink has a mounting surface for mounting each of the single-phase switching tube groups for efficiently move away heat generated by the single-phase switching tube groups.

Abstract: A smoking product with one or more filters, such as a cigar or cigarette. The filters may comprise micro-fibers, nano-fibers, or a combination thereof, wherein the fibers are provided by electrospinning. The filters may be disc-shaped, hemispherical-shaped, convex lens-shaped, and/or may comprise one or more folding structures. The smoking product may be a tobacco product, and may comprise a plurality of filters comprising one or more materials and one or more sizes and/or shapes, and the filters may comprise fibers of provide a size gradient from a first end of the product to the second end. In addition, the filters may further comprise one or more catalysts adapted to adsorb or filter to reduce or remove one or more materials, which may be toxic. Methods of making the filters and tobacco products are provided.