The power factor of an AC electric power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit, and is a dimensionless number between 0 and 1 (frequently expressed as a percentage, e.g. 0.5 pf = 50% pf). Real power is the capaci...
US5224029 1991年8月16日 1993年6月29日 Newman Jr Robert C Power factor and harmonic correction circuit including ac startup circuitUS5224029 * Aug 16, 1991 Jun 29, 1993 Newman Jr Robert C Power factor and harmonic correction circuit including ac startup circuit...
Power factor for an AC circuit is the ratio of the instantaneous real power used by an electrical load to the apparent power running through the circuit. It is a measure of how effectively power is transmitted and used by loads attached to an electrical grid, highlighting the relationship betwe...
In a DC circuit, the power is: P=I VP=IV where: I [A]I [A]— Current in amperes; V [V]V [V]— Voltage in volts; and P [W]P [W]— Power in watts. In AC circuits, the equation is: P=I VpfP=IVpf where the new symbol pfpf stands for power factor. What is the...
The proposed circuit inherently forces the input current to be discontinuous and AC modulated to achieve high-input power factor. The converter output is operated in discontinuous mode to minimize the bulk capacitor voltage variations when the output load is varied. Analysis of the converter is ...
Aspects for a power converter with power factor correction (PFC) circuit are described. The aspects include a buck/boost circuit for achieving a DC voltage from an AC input voltage signal line without developing an inrush current from the AC input voltage line, and a DC/DC converter circuit ...
Voltage control and power factor correction in AC induction motors A voltage control circuit is disclosed. A power factor corrector may utilize the control circuit to provide power factor correction for an AC induction motor. An AC induction motor system may combine the power factor correct with an...
Of practical interest is to have the input voltage and current waveforms in the same phase, i.e., to obtain a unity power factor circuit, in order to satisfy the requirements of the IEC 1000-3-2 or IEEE 519 specifications. One of the methods to get this is to use a ZVT boost AC-...
current to an output load with a parallel bulk capacitor.The current source circuit is switched on and off at a timing dependent on the phase of the AC input signal.This is a low cost circuit with less components, enabling the power factor between relatively high, for example 0.7 and 0.9....
Zhou, C. et al., “Design and Analysis of a Hysteretic Boost Power Factor Correction Circuit,” 21st Annual IEEE Power Electronics Specialists Conference (PESC), Jun. 11-14, 1990, pp. 800-807. Rossetto, L. et al., “Control Techniques for Power Factor Correction Converters,” Proc. of...