System and method for a switching converter
First Claim
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1. A method for operating a switching converter, the method comprising:
- generating an output current with a current ripple; and
generating a switching signal, the switching signal switching between a high state and a low state with a switching frequency and a switching period, the switching period being one over the switching frequency, wherein generating the switching signal comprisesmaintaining the output current of the switching converter with a substantially constant average value during a first mode of operation;
determining a switching frequency value of the switching signal during the first mode of operation;
comparing the switching frequency value to a first frequency range during the first mode of operation, wherein the first frequency range comprises a lower frequency limit and a higher frequency limit, the higher frequency limit being higher than the lower frequency limit;
if the switching frequency value is below the lower frequency limit or above the higher frequency limit, adjusting the current ripple of the output current in order to adjust the switching frequency to be above the lower frequency limit and below the higher frequency limit during the first mode of operation, wherein the current ripple is determined as a difference between a maximum current peak and a minimum current peak during a switching cycle of the switching signal, wherein the switching cycle has a duration of the switching period of the switching signal;
determining a current ripple value of the output current during the first mode of operation as a difference between a maximum current peak and a minimum current peak during a switching cycle of the switching signal, wherein the switching cycle has a duration of the switching period of the switching signal;
comparing the determined current ripple value of the output current to a first current ripple range during the first mode of operation, wherein the first current ripple range comprises a lower current limit and a higher current limit, the higher current limit being higher than the lower current limit; and
if the determined current ripple value of the output current is outside the first current ripple range, adjusting the current ripple value of the output current so that the current ripple value of the output current is within the first current ripple range during the first mode of operation.
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Abstract
According to various embodiments, a method for operating a switching converter includes determining an operating parameter of the switching converter and, if the operating parameter is outside a first operating range, adjusting a control parameter in order to adjust the operating parameter to be within the first operating range. The operating parameter includes at least one of a switching frequency of the switching converter and a current ripple value of an output current.
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Citations
21 Claims
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1. A method for operating a switching converter, the method comprising:
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generating an output current with a current ripple; and generating a switching signal, the switching signal switching between a high state and a low state with a switching frequency and a switching period, the switching period being one over the switching frequency, wherein generating the switching signal comprises maintaining the output current of the switching converter with a substantially constant average value during a first mode of operation; determining a switching frequency value of the switching signal during the first mode of operation; comparing the switching frequency value to a first frequency range during the first mode of operation, wherein the first frequency range comprises a lower frequency limit and a higher frequency limit, the higher frequency limit being higher than the lower frequency limit; if the switching frequency value is below the lower frequency limit or above the higher frequency limit, adjusting the current ripple of the output current in order to adjust the switching frequency to be above the lower frequency limit and below the higher frequency limit during the first mode of operation, wherein the current ripple is determined as a difference between a maximum current peak and a minimum current peak during a switching cycle of the switching signal, wherein the switching cycle has a duration of the switching period of the switching signal; determining a current ripple value of the output current during the first mode of operation as a difference between a maximum current peak and a minimum current peak during a switching cycle of the switching signal, wherein the switching cycle has a duration of the switching period of the switching signal; comparing the determined current ripple value of the output current to a first current ripple range during the first mode of operation, wherein the first current ripple range comprises a lower current limit and a higher current limit, the higher current limit being higher than the lower current limit; and if the determined current ripple value of the output current is outside the first current ripple range, adjusting the current ripple value of the output current so that the current ripple value of the output current is within the first current ripple range during the first mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A switching converter comprising:
a controller configured to; generate an output current with a current ripple; and generate a switching signal, the switching signal switching between a high state and a low state with a switching frequency and a switching period, the switching period being one over the switching frequency, wherein generating the switching signal comprises; maintaining an output current of the switching converter having a substantially constant average value during a first mode of operation, determining a switching frequency value of the switching converter during the first mode of operation, comparing the switching frequency value to a first frequency range during the first mode of operation, wherein the first frequency range comprises a lower frequency limit and a higher frequency limit, the higher frequency limit being higher than the lower frequency limit, if the switching frequency value is below the lower frequency limit or above the higher frequency limit, adjusting the current ripple of the output current in order to adjust the switching frequency to be above the lower frequency limit and below the higher frequency limit during the first mode of operation, wherein the current ripple is determined as a difference between a maximum current peak and a minimum current peak during a switching cycle of the switching signal, wherein the switching cycle has a duration of the switching period of the switching signal determining a current ripple value of the output current during the first mode of operation as a difference between a maximum current peak and a minimum current peak during a switching cycle of the switching signal, wherein the switching cycle has a duration of the switching period of the switching signal, comparing the determined current ripple value of the output current to a first current ripple range during the first mode of operation, wherein the first current ripple range comprises a lower current limit and a higher current limit, the higher current limit being higher than the lower current limit, and if the determined current ripple value is outside the first current ripple range, adjusting the current ripple value to be within the first current ripple range during the first mode of operation. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A switching converter comprising:
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a switching unit configured to be coupled to an energy storage element; an average current controller coupled to the switching unit and configured to maintain an output current to the energy storage element having a substantially constant average value; and a frequency ripple controller coupled to the switching unit and configured to; determine a switching frequency of the switching converter, compare the switching frequency of the switching converter to a first frequency range, wherein the first frequency range comprises a lower frequency limit and a higher frequency limit, the higher frequency limit being higher than the lower frequency limit, determine a current ripple value of the output current from the switching converter, wherein the current ripple value as a difference between a maximum current peak and a minimum current peak during a switching cycle of the switching converter, wherein the switching cycle has a duration of a switching period, the switching period being one over the switching frequency, and adjust the current ripple value and the switching frequency if either the current ripple value is outside of a first current ripple range or the switching frequency is below the lower frequency limit or above the higher frequency limit. - View Dependent Claims (18, 19, 20, 21)
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Specification