Direct current (DC)-DC converter having a multi-stage output filter
First Claim
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1. Circuitry comprising:
- a first switching converter configured to provide a first output signal; and
a multi-stage filter configured to filter the first output signal to provide a first switching power supply output signal and comprising a first inductance (L) capacitance (C) filter and at least a second LC filter coupled in series between the first switching converter and a direct current (DC)-DC converter output, such that;
the first LC filter has a first LC time constant and the second LC filter has a second LC time constant, which is less than the first LC time constant; and
the first LC filter comprises a first capacitive element having a first self-resonant frequency, which is equal to a first notch frequency of the multi-stage filter.
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Abstract
A direct current (DC)-DC converter that includes a first switching converter and a multi-stage filter is disclosed. The multi-stage filter includes at least a first inductance (L) capacitance (C) filter and a second LC filter coupled in series between the first switching converter and a DC-DC converter output. The first LC filter has a first LC time constant and the second LC filter has a second LC time constant, which is less than the first LC time constant. The first LC filter includes a first capacitive element having a first self-resonant frequency, which is about equal to a first notch frequency of the multi-stage filter.
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Citations
24 Claims
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1. Circuitry comprising:
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a first switching converter configured to provide a first output signal; and a multi-stage filter configured to filter the first output signal to provide a first switching power supply output signal and comprising a first inductance (L) capacitance (C) filter and at least a second LC filter coupled in series between the first switching converter and a direct current (DC)-DC converter output, such that; the first LC filter has a first LC time constant and the second LC filter has a second LC time constant, which is less than the first LC time constant; and the first LC filter comprises a first capacitive element having a first self-resonant frequency, which is equal to a first notch frequency of the multi-stage filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method comprising:
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providing a first switching converter; providing a multi-stage filter comprising a first inductance (L) capacitance (C) filter and at least a second LC filter, such that; the first LC filter has a first LC time constant and the second LC filter has a second LC time constant, which is less than the first LC time constant; and the first LC filter comprises a first capacitive element having a first self-resonant frequency, which is equal to a first notch frequency of the multi-stage filter; receiving and converting a DC power supply signal from a DC power supply to provide a first switching power supply output signal; and regulating the first switching power supply output signal based on a setpoint.
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22. A method for selecting components for a multi-stage filter used with a switching converter comprising:
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determining a desired switching frequency of the switching converter; determining a first notch frequency of the multi-stage filter based on the desired switching frequency and a desired lowpass filter response of the multi-stage filter; and selecting a first capacitive element of a first inductance (L) capacitance (C) filter of the multi-stage filter, such that a self-resonant frequency of the first capacitive element is equal to the first notch frequency. - View Dependent Claims (23, 24)
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Specification