Power conversion circuit and associated operating method
First Claim
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1. A power conversion circuit, comprising:
- an input terminal coupled to an input voltage;
a first switching element having a pair of first terminals and a first control terminal, wherein the pair of first terminals is connected between the input terminal and a first node;
a second switching element having a pair of second terminals and a second control terminal, wherein the pair of second terminals is connected between the first node and a second node;
a third switching element having a pair of third terminals and a third control terminal, wherein the pair of third terminals is connected between the second node and a third node;
a fourth switching element having a pair of fourth terminals and a fourth control terminal, wherein the pair of fourth terminals is connected between the third node and a ground;
a capacitor coupled between the first node and the third node;
an inductor coupled between the second node and a load; and
a controller configured to control the first, second, third and fourth switching elements to be switched ON/OFF through the first, second, third and fourth control terminals, respectively, such that a voltage at the load is regulated by repetitively (1) directly charging the inductor with a first current and then charging the capacitor in series with the inductor so that a second current flowing in the inductor when the capacitor is charged and (2) directly charging the inductor with a third current and then discharging the capacitor in series with the inductor so that a fourth current flowing in the inductor when the capacitor is discharged.
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Abstract
A power conversion circuit includes an input terminal, a first switching element, a second switching element, a third switching element, a fourth switching element, a capacitor; an inductor; and a controller configured to control the switching elements to be switched ON/OFF, such that a voltage at the load is regulated by repetitively (1) charging the inductor with a first current before charging the capacitor causing a second current to flow in the inductor and (2) charging the inductor with a third current before discharging the capacitor causing a fourth current to flow in the inductor.
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Citations
31 Claims
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1. A power conversion circuit, comprising:
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an input terminal coupled to an input voltage; a first switching element having a pair of first terminals and a first control terminal, wherein the pair of first terminals is connected between the input terminal and a first node; a second switching element having a pair of second terminals and a second control terminal, wherein the pair of second terminals is connected between the first node and a second node; a third switching element having a pair of third terminals and a third control terminal, wherein the pair of third terminals is connected between the second node and a third node; a fourth switching element having a pair of fourth terminals and a fourth control terminal, wherein the pair of fourth terminals is connected between the third node and a ground; a capacitor coupled between the first node and the third node; an inductor coupled between the second node and a load; and a controller configured to control the first, second, third and fourth switching elements to be switched ON/OFF through the first, second, third and fourth control terminals, respectively, such that a voltage at the load is regulated by repetitively (1) directly charging the inductor with a first current and then charging the capacitor in series with the inductor so that a second current flowing in the inductor when the capacitor is charged and (2) directly charging the inductor with a third current and then discharging the capacitor in series with the inductor so that a fourth current flowing in the inductor when the capacitor is discharged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19)
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17. A method of operating a power conversion circuit, comprising:
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supplying an input voltage to the power conversion circuit, the power conversion circuit comprising;
an input terminal coupled to an input voltage;
a first switching element having a pair of first terminals and a first control terminal, wherein the pair of first terminals is connected between the input terminal and a first node;
a second switching element having a pair of second terminals and a second control terminal, wherein the pair of second terminals is connected between the first node and a second node;
a third switching element having a pair of third terminals and a third control terminal, wherein the pair of third terminals is connected between the second node and a third node;
a fourth switching element having a pair of fourth terminals and a fourth control terminal, wherein the pair of fourth terminals is connected between the third node and a ground;
a capacitor coupled between the first node and the third node;
an inductor coupled between the second node and a load; and
a controller configured to control the first, second, third and fourth switching elements to be switched ON/OFF through the first, second, third and fourth control terminals, respectively; andchanging the ON/OFF configuration of the first to fourth switching elements by the controller, such that a voltage at the load is regulated by repetitively (1) directly charging the inductor with a first current and then charging the capacitor in series with the inductor so that a second current flowing in the inductor when the capacitor is charged and (2) directly charging the inductor with a third current and then discharging the capacitor in series with the indicator so that a fourth current flowing in the inductor when the capacitor is discharged. - View Dependent Claims (18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification