A systematic combination of the circuit elements to derive a new topology with low common mode noise is suggested in this paper. Conventionally, a majority of the new topology derivation or circuit refinement is fulfilled by changing a small part of the traditional circuits or adding extra circuits to them, which gives less insight to the new topology creation. The proposed combination method totally rearranges the circuit elements and finds new topologies, focusing on the basics of the topology -connections between the elements. The resultant H-bridge converter with the additional switches (HA converter) and its offspring circuits are proved to have low noise than their counterpart circuits by experiments.
I. INTRODUCTIONCreating new circuit topology has been already reported for various purposes. To simplify the circuit structure and improve the efficiency, single-stage frond-end rectifiers are reported by merging power factor correction stage with its downstream DC-DC converters [1]. In low-voltage AC-DC converter, Dwari [2] paralleled the boost and buck-boost converter to improve the energy harvesting efficiency. The soft switching scheme to reduce the switching loss is implemented by adding resonant circuit elements to the conventional converters [3]. To develop low-noise converter, Shoyama [4] made the boost converter symmetric by splitting the boost inductance into two and employing an additional output diode, which confines the common mode current inside the converter circuit while it requires additional inductor and diode. Knurek [5] suggests changing the location of the MOSFET and diode to reduce the noise of forward converter. The aforementioned methods achieve the new topology by changing a small part of the traditional circuits or adding extra circuits to them, which gives less insight to the new topology creation.