APoly vinyal chloride cylindrical tube of length 22 cms and diameter 4 cm is wound with an insulated copper wire of gauge number 19. Ten CRGO laminations of rectangular in shape are passed through the tube. The width, thickness and length of lamination are 3.8 cms, 0.3 cms and 50 cm. These act as cores. This entire assembly act as primary. This is shown in figure 1 six such primaries are assembled. The DC resistance of each coil is 0.8 ohms. The AC impedance of each coil is 4.2 ohms.
This paper presents an alternate quasi-resonant dc link (QRDCL) circuit for soft switched inverters which does not require paralleling of a charged capacitor with another charged capacitor or a voltage source. The circuit momentarily pulls down the DC link voltage to zero as commandled by the control circuit to facilitate zero voltage switching (ZVS) of inverter devices. Operation of this circuit is independent of load current. The circuit is snubberless and offers true PWM capability. The paper covers description of the circuit, operating principles, detailed analysis of various modes and design considerations. Feasibility and operating principles of the circuit have been verified by simulation using PSPICE.
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