US 2011/0235367 A1Published application

Dc to dc converter

AssigneeKabushiki Kaisha Toshiba

InventorsTakeshi Ueno, Tetsuro Itakura

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Abstract

A DC to DC converter includes an input terminal, an output terminal, first and second switches, an inductor, a smoothing unit, a first impedance element, a first resistor element, an operational amplifier and a control unit. The first switch is connected to the input terminal. The second switch is connected to the first switch and a ground terminal. The inductor is connected to the first switch and the output terminal. The smoothing unit is connected to the inductor and the ground terminal. The first impedance element is connected to the smoothing unit. The first resistor element is connected in series with the first impedance element. The operational amplifier is connected to the first impedance element. Reference voltage is added to the operational amplifier. The control unit controls the first and second switches according to a control signal outputted from the operational amplifier.

Claims6

Dependent claims

A DC to DC converter for converting an input voltage into an output voltage, the output voltage being lower than the input voltage, comprising:

an input terminal into which the input voltage is inputted;
an output terminal from which the output voltage is outputted;
a first switch to switch on and off, one terminal of the first switch being connected to the input terminal;
a second switch to switch on and off, one terminal of the second switch being connected to the other terminal of the first switch, the other terminal of the second switch being connected to a ground terminal;
an inductor, one terminal of the inductor being connected to the first switch, the other terminal of the inductor being connected to the output terminal;
a smoothing unit, one terminal of the smoothing unit being connected to the other terminal of the inductor, the other terminal of the smoothing unit being connected to the ground terminal;
a first impedance element, one terminal of the first impedance element being connected to one terminal of the smoothing unit;
a first resistor element, one terminal of the first resistor element being connected to one terminal of the first impedance element, the other terminal of the first resistor element being connected to the other terminal of the first impedance element;
an operational amplifier having
an inverting input terminal being connected to the other terminal of the first impedance element,
a non-inverting input terminal being applied with a reference voltage, and
a control output terminal to obtain a control signal;
and
a control unit configured to control the first and second switches using the control signal of the operational amplifier.

11 more elements

Dependencies are inferred from the claim text.