This article discusses the operating performance of a four-switch resonance inverting bidirectional buck-boost DC/DC converter using a novel three-dimensional control variable scheme. This novel control scheme allows DC/DC converter to operate on wide-input to wide-output voltage range but also helps to achieve zero-voltage switching (ZVS) operation for all four switches. Additionally, the RMS value of resonance current is significantly reduced, which is directly proportional to conduction loss. In the end, a four-switch resonance inverting buck-boost DC/DC converter is designed and experimentally tested; the prototype has recorded over 99% peak efficiency. The converter operates from −48 Vdc to 28 Vdc ~ 60 Vdc.