This paper presents a soft switching technique used along with the series connected transformer to run a PMDC motor. The three level PWM circuits with two active switches and the capacitors are connected in parallel with it. The two switches are reduced in the existing method. Instead of those two switches two capacitors are used to reduce the switching losses. The series resonant converter is used to achieve ZVS turn-on for all power switches and zerocurrent switching for all rectifier diodes. The switching losses of the switches and the reverse recovery loss of the diodes are reduced. The resonant converter has wide range of switching frequency that can be overcome by adopting the PWM method to regulate the output voltage. The series connected transformer is used in the primary and secondary side to balance and share the current which is supplied to the load. The PMDC motor can be used as load. The conventional method does not use any controller to control the resistive load. The speed of the motor can be sensed by using the fuzzy logic controller.The leakage inductance can be reduced by making the frequency constant. KEYWORDS: ZVS, ZCS, Fuzzy logic controller, PMDC motor, Converter, Cascaded Transformer I.INTRODUCTIONIn the conventional system three level or multilevel converters has been used obtaining high voltage. By using the neutral point diode and clamp, flying clamp the voltage stress can be reduced in the converters. Three level ZVS or ZCS converters [1] have been proposed to reduce the switching losses at the desired load range. To extend the range of the ZVS or ZCS the additional circuitry or leakage inductance has been used. The series resonant converters with variable switching frequency have been presented to have the advantages of high voltage gain and high circuit efficiency with a wide load range [2]. The series resonant converters have been widely adopted in the commercial computer and communication products [3].A resonant mode system gives the several benefits avoids many of the disadvantages occurred due to higher frequencies. While using a resonant circuit in the power path, the switches can be easily operate at either zero current or voltage in the waveform, So that the stress level of the switches can be reduced; the resonant sine waves reduces the higher frequency harmonics that minimises the noises and so the circuit now requires inductance and capacitance, parasitic elements may enhance the circuit performance. With these benefits, power systems operating in the range of 500 kHz to 2.0 MHz are now practical [4][5][6]. Even though the resonant converters has wide range of frequency from light load to full load the magnetic components in the series resonant converters are not easy to design at the optimal condition. so it is better that the dc-dc converter has the advantages of ZVS and ZCS functions in the series resonant converter and the constant switching frequency with duty cycle control. A new two level ZVS converter is presented for high input and current applications. ...