Bidirectional converters can transfer power in both directions between the two sources. These converters can be achieved by adding an anti-parallel diode to the switch and controllable switch in parallel with diodein a unidirectional converter. Thus power can flow in both directions. Bidirectional converters are widely used in applications which the two way transfer of power is required, such as DC motor drive systems with the capability of energy recovery during braking, uninterruptible power supply systems, battery charger and discharger systems, auxiliary power supply for hybrid electric vehicles. Depending on the application, bidirectional DC-DC converters can be isolated or non-isolated. Isolated bidirectional converters are highly considered for creating electrical isolation between the primary side and secondary side in order to protect equipment and operators, and in cases which is not possible to use a common ground due to high voltage difference between input and output. When high voltage gain is not needed, non-isolated bidirectional converters can be used. For high power applications, bridge type bidirectional converters are an important topic of research in the past decade. Flyback converter is used in low power applications due to its simple structure. The main goals in bidirectional converter are reducing the switching losses, reducing the voltage and current stress, reducing the conduction losses, increasing the power density and reducing the number of elements. Increasing the power density can be achieved by increasing the switching frequency of the converter. Resonant converters are used to reduce switching losses. These converters reduce switching losses and can operate at high frequencies, but these topologies are not suitable for low power applications due to the complexity of their power circuit. Power circuit complexity and increase of the number of circuit elements lead to reduced power density. In this thesis, resonance technique is used in forward converter topology for low and medium power applications. By resonance technique and without applying any auxiliary switch or circuit, zero current switching can be achieved for all switches. The goals are reducing the number of circuit elements and conduction losses. Transformer of the converter is forward type. This converter has one magnetic element, which is not an energy storage element. Due to zero current switching, this structure is also appropriate for IGBT elements. Keywords : 1- bidirectional converter 2-soft switching 3-resonance 4- isolation