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US 12,756,315 B2Granted
Buck-boost converter reducing inductor current
AssigneesSilicon Mitus, Inc., Silicon-Magic Semiconductor Technology (Hangzhou) Co., Ltd.
InventorsKwang Ho Yoon, Su Hun Lim, Jin Su Jung
Life of this patent
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Abstract
A buck-boost converter includes a first switch connected between an input terminal that receives an input voltage and a first terminal of an inductor, a second switch connected between the first terminal of the inductor and an output terminal that outputs an output voltage, a third switch connected between a second terminal of the inductor and a ground terminal, and a fourth switch connected between the second terminal of the inductor and an inverting input terminal that receives an inverted input voltage obtained by inverting the input voltage.
Claims12
A buck-boost converter comprising:
- a first switch connected between an input terminal to which an input voltage is input and a first terminal of an inductor;
- a second switch connected between the first terminal of the inductor and an output terminal that outputs an output voltage;
- a third switch connected between a second terminal of the inductor and a ground terminal, wherein the third switch receives a voltage substantially equal to the voltage at the ground terminal;
- and
- a fourth switch connected between the second terminal of the inductor and an inverting input terminal to which an inverted input voltage obtained by inverting the input voltage is input,
- wherein
- the output voltage is generated according to the input voltage, the inverted input voltage, and status of the first switch, the second switch, the third switch, and the fourth switch,
- during a first time, an inductor current in the inductor gradually rises, when the first switch and the third switch are turned on, the second switch and the fourth switch are turned off, a voltage of the first terminal of the inductor rises to the input voltage, and a voltage of the second terminal of the inductor is maintained at a ground level, and
- during a second time following the first time, the inductor current gradually falls, when the second switch and the fourth switch are turned on, the first switch and the third switch are turned off, the voltage of the first terminal of the inductor falls to the output voltage, and the voltage of the second terminal of the inductor falls to the inverted input voltage.
6 more elements
A buck-boost converter comprising:
- a first switch connected between an input terminal to which an input voltage is input and a first terminal of an inductor;
- a second switch connected between the first terminal of the inductor and an output terminal that outputs an output voltage;
- a third switch connected between a second terminal of the inductor and a ground terminal, wherein the third switch receives a voltage substantially equal to the voltage at the ground terminal;
- a fourth switch connected between the second terminal of the inductor and an inverting input terminal to which an inverted input voltage obtained by inverting the input voltage is input;
- and
- a controller configured to control a rising slope and a falling slope of an inductor current by adjusting operating timings of the third switch and the fourth switch according to a comparison result of the input voltage and an absolute value of the output voltage,
- wherein
- the output voltage is generated according to the input voltage, the inverted input voltage, and status of the first switch, the second switch, the third switch, and the fourth switch,
- the controller comprises:
- a comparator configured to output a comparison result signal of the input voltage and an absolute value of the output voltage,
- an OR operation device configured to output a value, obtained by performing an OR operation of a control signal of the first switch and the comparison result signal, as a control signal of the third switch, and
- an AND operation device configured to output a value, obtained by performing an AND operation of a control signal of the second switch and an inverted comparison result signal obtained by inverting the comparison result signal, as a control signal of the fourth switch.
9 more elements
A buck-boost converter comprising:
- a first switch connected between an input terminal that receives an input voltage and a first terminal of an inductor;
- a second switch connected between the first terminal of the inductor and an output terminal that outputs an output voltage;
- a third switch and a fourth switch connected in series between the input terminal and a ground terminal;
- a charge pump capacitor connected between a third terminal, which is positioned between the third switch and the fourth switch, and a second terminal of the inductor;
- a charge pump switch connected between the second terminal of the inductor and a ground terminal;
- and
- a controller configured to control a rising slope and a falling slope of an inductor current by adjusting operating timings of the third switch, the fourth switch, and the charge pump capacitor according to a comparison result of the input voltage and an absolute value of the output voltage.
4 more elements
Dependencies are inferred from the claim text.