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US 12,738,847 B2Granted
Buck converter, method of operating the same and electronic device including the same
AssigneeSamsung Electronics Co., Ltd.
InventorHongseok Shin
Life of this patent
Estimating the term…
Abstract
A buck converter includes a power switching circuit that alternately transfers an input voltage and a ground voltage to an output terminal in response to a pulse switching signal, an LC filter, one end of which is connected to the output terminal, a sensing voltage generator that generates voltages corresponding to changes in an inductor current between the output terminal and a second end of the inductor, and an overshooting detector that generates a switching off signal in response to the voltages and a first reference voltage.
Claims20
A buck converter comprising:
- a power switching circuit including a high side (HS) switch and a low side (LS) switch, the power switching circuit configured to alternately transfer an input voltage and a ground voltage to an output terminal through the HS switch and the LS switch in response to a pulse switching signal;
- an inductor having a first end connected to the output terminal and a second end connected to a load capacitor, the inductor configured to generate an output voltage at the second end;
- a sensing voltage generator configured to generate a first voltage and a second voltage, the sensing voltage generator including:
- a first resistor and a first capacitor connected in series between the output terminal and the second end of the inductor, the first voltage being a voltage at a first common node between the first resistor and the first capacitor;
- and
- a second resistor and a second capacitor connected in series between the first common node and the second end of the inductor, the second voltage being a voltage at a second common node between the second resistor and the second capacitor;
- and
- an overshooting detector configured to generate a switching off signal in response to a first reference voltage, the first voltage and the second voltage, and generate the first reference voltage based on replicating a current flowing through the first common node during a half of a turn-on time interval of the HS switch,
- the power switching circuit is further configured to
- based on the switching off signal being in a first state, the HS switch and the LS switch are alternately turned on in response to the pulse switching signal, and
- based on the switching off signal being in a second state, the LS switch is turned off.
8 more elements
A method of operating a buck converter, the method comprising:
- generating a reference voltage corresponding to a half of an amount of change in an inductor current in a steady state;
- generating a first voltage corresponding to an amount of change in the inductor current due to a change in a load current;
- sensing a first state in which the first voltage is higher than the reference voltage;
- and
- turning off a low side (LS) switch in response to the first state regardless of a pulse switching signal, the LS switch being included in a power switching circuit included in the buck converter.
2 more elements
An electronic device comprising:
- a first semiconductor chip including a power switching circuit including a high side (HS) switch and a low side (LS) switch;
- an inductor and a load capacitor connected to an output terminal of the power switching circuit, and configured to generate an output voltage;
- and
- a second semiconductor chip configured to receive the output voltage as a power supply voltage, and to consume a load current,
- the first semiconductor chip configured to
- generate a reference voltage corresponding to an amount of change in an inductor current flowing through the inductor during a half of a turn-on time interval of the HS switch,
- generate a first voltage corresponding to an amount of change in the inductor current due to a change in the load current, and
- adjust a slope of decreasing the inductor current depending on the reference voltage and the first voltage.
5 more elements
Dependencies are inferred from the claim text.