The circuit is simple, and the cost is low, but the power factor of passive PFC is not very high that can only reach 0.7~0.8 APFC need to use transistor and controlling IC, the cost of which is much higher than that of PPFC. Passive PFC(PPFC) only use capacitance, diode, inductance and other passive elements. There are two kinds of PFC, one is passive PFC, and the other is active PFC.
#Power factor correction matlab simulink full#
The English full name for PFC is "Power Factor Correction”. In 1982, the IEC laid down a regulation IEC55-2 to limit higher harmonic (the later modified one is IEC), and made many power electronics technicians start to study harmonic filtering and PFC. There are current pass through the rectifier diode D1~D4 only when input alternating voltage bigger than the voltage between the two ends of filter capacitor, so the input current presents in sharp impulse form, the distortion factor of wave form is small, power factor PF is small, usually 0.6~0.7, and then the electric grid and other electric equipments are polluted and disturbed. Emulated circuit figure for input circuit of AC/DC switching power The wave forms of input voltage and current are shown as Figure 4. Module is used to check input current and then calculate the current effective value I R ,Ĭurrent fundamental component 1, and at last use formula (1) to calculate the power factor.Īnd included angel between input voltage andįig. The SCOPE module is used to observe the input voltage and current wave form the current measuring Input equivalent electric circuit of AC/DC switching power supply The emulated electric circuit that uses MATLAB structure is shown as Figure 3. Input circuit of AC/DC switch power supplyįig. In simulation, use equivalent resistance R to replace the latter DC/DC and load as shown in the Figure 2.įig. The input circuit of traditional single-phased AC/DC switching power is demonstrated as Figure 1, after the mains supply(commercial power) is bridge rectified by D1~D4, it takes advantage of big electric capacity C to carry on smooth filtering to get DC voltage, and then transformed by DC/DC to realize insulation and voltage changing to supply the load. Matlab - Modelling, Programming and SimulationsĮfficiency than the linearly-regulated DC power because its main power elements work as high frequency switches, so its application range is wider and wider. At the same time, the switching power has higher Input Circuit and Its Power Factor of Single-Phase AC/DC Switching Power Supply Single-phase AC/DC switching power replaces the low frequency transformer of traditional power source with high frequency transformer, so it has such advantages as light weight, small size, and high power density etc. The smaller the , the bigger the input current harmonics of is, which will cause current distortion, produce pollution to electric grid, and even damage the electric equipments if condition is serious. The bigger the 1, the bigger the reactive power is, the bigger the wastage of conductive line wire and transformer It is clear that the power factor PF is determined by and 1. Voltage, is deformation factor of input current, 1 is the angel between the input AC voltage and fundamental component of the input current.
U1 is effective value of fundamental component of input AC I R is effective value of AC power source
In formula (1), PF is power factor, P is active power, S is apparent power, value of fundamental component of input current, current, P U1 I1 cos 1 I1 cos 1 cos 1 S U1 I R IR
X8 Matlab simulations for power factor correction of switching power Ren Kaichun, He Chunhan, Su Dan, Wang Yongli, Zhang Xingqi Liu Xiaojun, Gong Lihong, Zhao Ying and Liu Peng Chongqing Communication College Chinaĭefinition of Power Factor Definition of power factor is: Matlab simulations for power factor correction of switching power
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