12TH ACTIVE FILTER

• Main Authors: LEE, SEOK JIN, SHIN, JIN CHEOL, KIM, CHAN KI, AHN, JEONG SHIK, JUNG, GI LJO
• Format: Patent
• Language: English
• Published: 22.03.2005
• Edition: 7
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

A 12th active filter is provided to eliminate both 11th and 13th harmonics by using a converter for compensating for characteristic variations due to temperature changes and device wearing. A passive filter(7-1) is made of a condenser(7-1-1), an inductor(7-1-2), and a resistor(7-1-3). The condenser, the inductor, and the resistor have A, B, and C phases, respectively. The passive filter with respective phases is connected to a switch(7-3) and a power source converter(7-4) via a transformer(7-2). The power source converter includes an ignition portion(7-7) which is connected to a base of a transistor of semiconductor elements(V1-V6). A controller(7-6) is connected to the ignition portion and a signal detector(7-5) is connected to the controller. The controller eliminates both 11th and 13th harmonics.