A novel energy‐retaining inverter for AC arc welding machines

Abstract

A novel energy-retaining power supply for AC arc welding machines is proposed in this paper. In this kind of power supply, current-steering diodes connected across the output chokes keep the inductor current continuous and retain the energy during the commutation period, hence reducing the commutation time to ensure a better welding performance. In addition, the stored energy can be released in the next energy transfer cycle to raise the conversion efficiency. The circuit operations and design procedures are likewise examined thoroughly. Experimental results on a prototype inverter for driving a 100-A AC arc welding machine are recorded to validate the effectiveness of the presented scheme.

Space vector pulse‐width modulation for single‐phase full‐bridge Z‐source inverter

“…input voltage source: V in = 100 V; 2. impedance network: L 1 = L 2 = 2 mH, C 1 = C 2 = 800 μF; 3. output LC filter: L f = 2 mH, C f = 1 μF; 4. resistive load: R = 10 Ω; Firstly, we can find the boost factor B using (8), and then the time duration of every vector, and finally the switching time of each switch for the three patterns can be figured out through Equations (22), (24), and (25) and Figure 6. input voltage source: V in = 100 V; 2. impedance network: L 1 = L 2 = 2 mH, C 1 = C 2 = 800 μF; 3. output LC filter: L f = 2 mH, C f = 1 μF; 4. resistive load: R = 10 Ω; Firstly, we can find the boost factor B using (8), and then the time duration of every vector, and finally the switching time of each switch for the three patterns can be figured out through Equations (22), (24), and (25) and Figure 6.…”

A module‐integrated isolated solar micro‐inverter without electrolytic capacitors

“…It can be observed from Equation (7) that the second harmonic voltage ripple v bus,2 is related with the load current and DC-bus capacitance. E-Caps is always necessary for providing high DC-bus capacitance to reduce the second harmonic voltage ripple and prevent harmonic distortion on inverter AC output side [24][25][26][27][28][29][30]. In this paper, a harmonic suppression technique is presented to reduce the total harmonic distortion (THD) of the studied solar micro-inverter.…”

Simplified quasi‐Z source indirect matrix converter

“…There are two types of conversion systems to achieve ac-ac power conversion: one is ac-dc-ac twostage converter and the other is matrix converter. Traditional ac-dc-ac converter produces variableamplitude and/or variable-frequency output voltages with a stiff dc-link voltage through a large dc-link capacitor, which play important roles in motor drives, uninterruptable power supplies, renewable energy, and hybrid electric vehicles [1][2][3][4], as shown in Figure 1 [5]. The matrix converter connects input phases to output phases with an array of controlled power switches without dc-link capacitor shown in Figure 2(a) and (b) [6][7][8][9][10][11][12][13][14][15].…”