Average Current Control of a Series-Type Single-Phase PFC With Hybrid Modulation

Abstract

This letter proposes a hybrid modulation scheme for the average current control (ACC) of the series-type single-phase power factor correction (PFC). The series PFC is a newly developed harmonic correction method for single-phase diode rectifier. It is composed of a hybrid full-bridge inverter and is in cascade between the dc terminal of the diode rectifier and the dc load. When the conventional ACC is applied, due to the large duty-ratio variation at the low-frequency transition points, the line current waveforms exhibit large distortion at the low-frequency switching points. A hybrid scheme, which combines the leading-edge and the trailing-edge modulation, is developed to overcome this problem. The reference signal selection and control logic design are discussed and implemented. Experimental results show that the proposed hybrid approach is able to reduce the harmonic distortion in the line current significantly, as compared with the conventional ACC control.

Fast Demagnetization and Vibration Reduction in Switched Reluctance Motor Drive System

“…1, ACM consists of two internal and external loops designed to control input current and output voltage, respectively. An essential requirement for adjusting these loops' speed is considering crossover frequency for both the voltage and current loops [17]. The capacitors' voltage balancing depends on the loading condition.…”

“…Using the first derivative of phase voltage with respect to time in (17) and assuming di/dt almost zero at the beginning of demagnetization, and excluding the stator winding resistance, the first derivative of input power at this moment is approximately shown in (19).…”

Three-phase power factor corrector with direct power control and power supply of the unbalanced industrial network

“…Mathematical description of the proposed three-phase PFC was developed using the method of switching functions [8,9]. Switching functions of the transistors are introduced as follows:…”

“…There are many ways to provide control of threephase PFC. Methods of immediate network current curve shaping [8][9][10] and direct power control [11][12][13][14][15] are the most widely used. Here we have chosen the method of direct power control.…”