DC-DC CONVERTER CIRCUIT
First Claim
1. A voltage conversion unit comprising:
- a switching DC-DC converter including an input terminal for receiving an input voltage from a source, a control terminal adapted to receive a pulse width modulated driving signal oscillating at a first frequency, and an output terminal for providing to a load an output voltage generated from the input voltage according to the driving signal, anda switching control unit configured to receive the output voltage and a reference voltage and to set a duty cycle of the driving signal based on a comparison between the output voltage and the reference voltage, the switching DC-DC converter and the switching control unit forming a feedback loop having a loop gain defining a corresponding operating bandwidth of the voltage conversion unit, wherein the load is configured to drain a current pulse train having a second frequency, the values of the first and second frequencies being such to cause the occurrence of beat oscillations at frequencies comprised within the operating bandwidth; and
wherein the switching control unit comprises means for reducing an amplitude of the beat oscillations by increasing the loop gain at least for a frequency interval comprised within the operating bandwidth.
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Accused Products
Abstract
An embodiment of a voltage conversion unit is proposed. The voltage conversion unit comprises a switching DC-DC converter including an input terminal for receiving an input voltage from a source, a control terminal adapted to receive a pulse width modulated driving signal oscillating at a first frequency, and an output terminal for providing to a load an output voltage generated from the input voltage according to the driving signal. The voltage conversion unit further comprises a switching control unit configured to receive the output voltage and a reference voltage and to set a duty cycle of the driving signal based on a comparison between the output voltage and the reference voltage. The switching DC-DC converter and the switching control unit form a feedback loop having a loop gain defining a corresponding operating bandwidth of the voltage conversion unit. The load is configured to drain a current pulse train having a second frequency; the values of the first and second frequencies are such to cause the occurrence of beat oscillations at frequencies comprised within the operating bandwidth. The switching control unit comprises means for reducing the beat oscillations by increasing the loop gain at least for a frequency interval comprised within the operating bandwidth.
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Citations
44 Claims
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1. A voltage conversion unit comprising:
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a switching DC-DC converter including an input terminal for receiving an input voltage from a source, a control terminal adapted to receive a pulse width modulated driving signal oscillating at a first frequency, and an output terminal for providing to a load an output voltage generated from the input voltage according to the driving signal, and a switching control unit configured to receive the output voltage and a reference voltage and to set a duty cycle of the driving signal based on a comparison between the output voltage and the reference voltage, the switching DC-DC converter and the switching control unit forming a feedback loop having a loop gain defining a corresponding operating bandwidth of the voltage conversion unit, wherein the load is configured to drain a current pulse train having a second frequency, the values of the first and second frequencies being such to cause the occurrence of beat oscillations at frequencies comprised within the operating bandwidth; and wherein the switching control unit comprises means for reducing an amplitude of the beat oscillations by increasing the loop gain at least for a frequency interval comprised within the operating bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a second capacitor having a first terminal coupled to the second terminal of the first capacitor and a second terminal coupled to a first terminal of a resistor, the resistor having a second terminal coupled to the inverting input terminal of the operational amplifier, wherein the means for reducing the beat oscillations includes an additional capacitor having a first terminal coupled to the first terminal of the resistor and a second terminal coupled to the inverting input terminal of the operational amplifier.
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8. The voltage conversion unit of claim 1, wherein the load is a central processing unit or a graphic processor unit.
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9. The voltage conversion unit of claim 1, wherein both the first and second frequencies are of the order of magnitude of the hundreds of kHz.
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10. A power supply, comprising:
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an output node; a circuit node operable to receive an interference signal having a first frequency; a converter circuit operable to generate a regulated output signal at the output node and to switch at a second frequency; and a feedback circuit coupled to the output node and to the converter circuit and operable to generate a compensation signal having a third frequency that is approximately equal to a difference between the first and second frequencies. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A system, comprising:
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a power supply, including; an output node; a circuit node operable to receive an interference signal having a first frequency; a converter circuit operable to generate a regulated output signal at the output node and to switch at a second frequency; and a feedback circuit coupled to the output node and to the converter circuit and operable to generate a compensation signal having a third frequency that is approximately equal to a difference between the first and second frequencies; and a load coupled to the output node. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A method, comprising:
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generating a regulated output signal at an output node by coupling a first input signal to the output node at a first frequency and at a duty cycle; receiving an interference signal having a second frequency; and compensating the regulated output signal at a third frequency that is approximately equal to a difference between the first and second frequencies. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44)
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Specification