A　new　nonlinear　control　of　integrated　function　control　is　proposed　and　its　control　law　is　deduced.　This　new　control　method　can　achieve　zero-voltage　regulation　of　the　converter　output　voltage,　i.　e.,　the　closed-loop　output　voltage　remains　dynamically　unchanged　when　the　supply　voltage　or　load　current　changes.　There　is　no　steady-state　error　nor　dynamic　error　between　the　control　reference　and　the　average　value　of　the　switched　variable.　Simulations　and　experiment　with　a　buck　converter　have　demonstrated　the　robustness　of　the　control　strategy　and　verified　the　theoretical　predictions.