Patent ID: 7995364

Claim:
A DC/DC converter circuit, comprising: a capacitor, which is coupled to an input power source; a switching circuit coupled to the capacitor through a first conducting path responsive to a first control signal; an output energy storing unit coupled to the switching unit through a second conducting path responsive to a second control signal, the output energy storing unit providing electric power to a load; and a controller coupled to the switching circuit for output of the first and second control signals thereto based on at least one clock signal and a feedback signal indicating a state of the output energy storing unit for transferring electric power from the input power source to the capacitor through the first conducting path, and from the capacitor to the output energy storing unit through the second conducting path; wherein the controller determines whether the state of the output energy storing unit is in a first state or in a second state according to the feedback signal, and maintains an output of the first control signal, and the second control signal off when the output energy storing unit is in the first state, and responsive the output energy storing unit entering into the second state, the controller immediately switches the first control signal off and generates the second control signal for a time period irrespective of a contemporaneous phase of the at least one clock signal to transfer electric power from the capacitor to the output energy storing unit, following the time period, the controller again switches the first control signal off and generates the second control signal in synchronism with a phase of the at least one clock signal until the output energy storing unit reenters the first state for thereby reducing a ripple voltage to the load.