Title :
Power factor improvement of a diode rectifier circuit by dither signals
Author_Institution :
Nagaoka Univ. of Technol., Japan
Abstract :
A power factor improvement to a diode rectifier having a high-frequency inverter on the load is described. The principle of the improvement is based on dither signal effects for linearization of the nonlinear system. A diode rectifier circuit, which can be regarded as a dead-zone element, is linearized based on this principle by adding a high-frequency dither signal to the input voltage. The output voltage of the high-frequency inverter is applied to the dither, which makes the input current of the rectifier sinusoidal. The dither rectifier circuit is composed of a diode voltage-doubler rectifier and a high frequency inverter that consists of only two switching elements. Its power factor is shown to be 99.2%, and the third and fifth harmonics are 10% and 0.4%, respectively. Uses of the high-frequency inverter in fluorescent lamp and switching power supply applications are discussed.<>
Keywords :
fluorescent lamps; harmonics; invertors; load (electric); power factor correction; power supplies to apparatus; rectifiers; semiconductor diodes; switching; HF invertors; applications; correction; dead-zone element; diode rectifier; dither signals; fluorescent lamp; harmonics; linearization; load; nonlinear system; power factor improvement; power supply; sinusoidal; switching; Diodes; Fluorescent lamps; Frequency; Inverters; Nonlinear systems; Power system harmonics; Reactive power; Rectifiers; Switching circuits; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-87942-553-9
DOI :
10.1109/IAS.1990.152351
