Ribbon Polymer Capacitors.
Basically capacitor is constructed of a dielectric polymer tape which is placed between two ribbons of aluminum (alluminium foil) as electrodes and rolled to obtain a desired electrode area. The roll is then inserted into the tube covered with aluminum or epoxy resin. Another construction is to use a layer of aluminum deposited (through evaporation) directly on the surface of the polymer as an electrode tape.
Thick polymer tape while only a few microns thick electrode layer deposited on the surface of the polymer is approximately 0.025 mm; thus the volume efficiency becomes high. Polymer used is polystyrene, polypropylene, polyester, polycarbonate. Capacitors of this type is widely used. Capacitors with a polystyrene dielectric has a loss factor (tand) is very low (<10 -3). Capacitance that can be achieved in this construction is between 10 -5 – 10 2 mF.
Paper with impregnation is also often used as well as the dielectric.
Figure 3.13 Ribbon Polymer Capacitors
Aluminum Electrolytic Capacitors.
This capacitor is constructed from two very pure aluminum ribbon with a thickness of about 50 mm as an electrode, and between them is placed a porous paper, then rolled to form a cylinder. One of the electrodes (ie anode) has a layer of alumina with a thickness of about 0.1 mm, which was formed by anodic. These reels then inserted into the cylinder dalamtabung berporinya paper impregnated dengansuatu electrolytes (eg ammonium pentaborat).
Thus tersusunlah capacitor comprising an anode tape aluminum, alumina as a dielectric layer, and electrolyte and aluminum tape the other as the cathode. In use the anode must remain positive potential. These capacitors were made in the range -1 to 10 antara10 4 mF.
Figure 3.15 Electrolyte Capacitors
Ceramic capacitors are made for use in voltage and low power and voltage and low-voltage power high.For we know the disk construction, construction tubes and multilayer construction.
Figure 3.16 Ceramic Capacitors
General construction consists of several plates of mica with a thickness between 0:25 to 50 mm as a dielectric with a layer of silver as an electrode that is arranged and clamped to form an array of capacitors connected in parallel. This arrangement is then wrapped with a thermosetting resin to protect it from moisture. Capacitors of this type are made in the range of 10 -5 to 10 -1 mF.
Figure 3.16 Various jensi Capacitors