DC-DC converter circuits and method for reducing DC bus capacitor current

A DC-DC converter circuit for reducing a DC bus capacitor current, comprising:

• a double frequency PFC circuit having two PFC circuits electrically connected in parallel, wherein two switches respectively disposed on said two boost converter circuits are turned on and off alternately to produce an output current having a frequency twice that of control signals of said two switches, and to offer a DC bus;
• a full-bridge DC-DC converter electrically connected to an output terminal of said double frequency PFC circuit for transforming an output of said DC bus to a DC voltage;
• and
• a DC bus capacitor electrically connected to said double frequency PFC circuit and said full-bridge DC-DC converter in parallel for balancing two corresponding transient powers of said double frequency PFC circuit and said full-bridge DC-DC converter respectively.

A DC-DC converter circuit for reducing a DC bus capacitor current, comprising:

• an n-tuple frequency boost converter circuit having n boost converter circuits electrically connected in parallel, wherein n switches respectively disposed on said n boost converter circuits are turned on and off alternately to produce an output current having a frequency n times that of control signals of said n switches, and to offer a DC bus;
• a full-bridge DC-DC converter electrically connected to an output terminal of said n-tuple frequency boost converter circuit for transforming an output of said DC bus to a DC voltage;
• and
• a DC bus capacitor electrically connected to said n-tuple frequency boost converter circuit and said full-bridge DC-DC converter in parallel for balancing two corresponding transient powers of said n-tuple frequency boost converter circuit and said full-bridge DC-DC converter respectively.

A DC-DC converter circuit for reducing a DC bus capacitor current, comprising:

• an n-tuple frequency PFC circuit having n PFC circuits electrically connected in parallel, wherein n switches respectively disposed on said n PFC circuits are turned on and off alternately to produce an output current having a frequency n times that of control signals of said n switches, and to offer a DC bus;
• a full-bridge DC-DC converter electrically connected to an output terminal of said n-tuple frequency PFC circuit for transforming an output of said DC bus to a DC voltage;
• and
• a DC bus capacitor electrically connected to said n-tuple frequency PFC circuit and said full-bridge DC-DC converter in parallel for balancing two corresponding transient powers of said n-tuple frequency PFC circuit and said full-bridge DC-DC converter respectively.