Rohm Co., Ltd.

Kazuki Hashimoto

Akihiro Kawano

Disclosed herein is a controller circuit of a series capacitor buck converter including input and output lines, a first switch, a coupled inductor including a first inductor and a second inductor, a second switch, a series capacitor, a third switch, a fourth switch, and an output capacitor. The controller circuit includes a control logic circuit that generates a plurality of control signals instructing ON-OFF states of the first to fourth switches so as to alternately repeat a first state in which the first switch and the fourth switch are ON and a second state in which the second switch and the third switch are ON, with an interval of dead time, and a first timing generator that generates a first timing signal as a trigger for turning on the first switch at a second dead time inserted into a period of transition from the second state to the first state.

Series capacitor buck converter and controller circuit and control method thereof

Provided is a controller circuit of a series capacitor step-down converter, the series capacitor step-down converter including an input line and an output line, a first switch, a coupled inductor, a second switch, a series capacitor, a third switch, a fourth switch, and an output capacitor, the controller circuit being configured to alternately switch between a first state in which the first switch and the fourth switch are on and a second state in which the second switch and the third switch are on while interposing a dead time between the first state and the second state, and turn on the second switch ahead of the third switch before a direction of a current of the first inductor is reversed in the dead time during a transition from the first state to the second state.

Series capacitor step-down converter, controller circuit thereof, and control method

Provided is a controller circuit for a series capacitor step-down converter that drives the series capacitor step-down converter at a switching frequency fhigher than a frequency frepresented by the following Equation wherein L is a design value for an inductance value of at least two inductors constituting a coupled inductor of the series capacitor step-down converter, M is a design value for a mutual inductance of the at least two inductors, and Cis a design value of a capacitance of a series capacitor.

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Kyoto, Japan

Kazuki Hashimoto