Power control system using a nonlinear delta-sigma modulator with nonlinear power conversion process modeling
First Claim
1. A power factor correction controller comprising:
- a processor to receive and process one or more switching power converter feedback signals and generate a pulse width control signal using each processed feedback signal; and
a pulse width modulator, coupled to the signal processor, having an input to receive the pulse width control signal and generate a pulse width modulated, power factor correction (PFC) control signal to control a switch that controls a power factor correction stage of the switching power converter;
wherein a pulse width of the PFC control signal varies approximately with a square root of the PWM control signal.
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Abstract
A power control system includes a switching power converter and a power factor correction (PFC) and output voltage controller. The switching power converter utilizes a nonlinear energy transfer process to provide power to a load. The PFC and output voltage controller generates a control signal to control power factor correction and voltage regulation of the switching power converter. The PFC and output voltage controller includes a nonlinear delta-sigma modulator that models the nonlinear energy transfer process of the switching power converter. The nonlinear delta-sigma modulator generates an output signal used to determine the control signal. By using the nonlinear delta-sigma modulator in a control signal generation process, the PFC and output voltage controller generates a spectrally noise shaped control signal. In at least one embodiment, noise shaping of the control signal improves power factor correction and output voltage regulation relative to conventional systems.
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Citations
21 Claims
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1. A power factor correction controller comprising:
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a processor to receive and process one or more switching power converter feedback signals and generate a pulse width control signal using each processed feedback signal; and a pulse width modulator, coupled to the signal processor, having an input to receive the pulse width control signal and generate a pulse width modulated, power factor correction (PFC) control signal to control a switch that controls a power factor correction stage of the switching power converter; wherein a pulse width of the PFC control signal varies approximately with a square root of the PWM control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. The power factor correction stage of claim 1 wherein the processor is further configured to process the one or more feedback signals of the power converter to control a period of the PFC control signal.
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11. A method of controlling power factor correction of a switching power converter, the method comprising:
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receiving one or more switching power converter feedback signals; processing each received feedback signal; generating a pulse width control signal using each processed feedback signal; and generating a pulse width modulated, power factor correction (PFC) control signal to control a switch that controls a power factor correction stage of the switching power converter; wherein a pulse width of the PFC control signal varies approximately with a square root of the PWM control signal.
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12. The method of claim 11 wherein generating a pulse width control signal using each processed feedback signal further comprises:
generating the pulse width control signal using a nonlinear delta-sigma modulator that includes a quantizer, a loop filter, and a feedback path coupled between the quantizer and the loop filter, and the feedback path includes a square process that generates a square of quantizer output signals.
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13. The method of claim 11 further comprising:
processing each of the feedback signals to track a function associated with variations of a time-varying voltage input signal to the switching power converter.
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14. The method of claim 11 wherein the PFC control signal includes a period, the method further comprising:
modulating the period of the PFC control signal to track a function associated with variations of a time-varying voltage output signal of the switching power converter.
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15. The method of claim 11 further comprising:
determining a period of the PFC control signal in accordance with a root mean square of the time-varying voltage input signal to the switching power converter.
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16. The method of claim 11 further comprising:
modulating a period of the PFC control signal in accordance with variations in a load coupled to the switching power converter.
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17. The method of claim 11 further comprising:
randomly modulating periods of the PFC control signal.
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18. The method of claim 11 further comprising:
processing each of the feedback signals to track a function associated with variations of a time-varying output voltage of the switching power converter.
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19. The method of claim 11 further comprising:
generating a digital pulse width modulated power factor correction (PFC) control signal.
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20. The method of claim 11 further comprising:
processing the one or more feedback signals of the power converter to control a period of the PFC control signal.
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21. An apparatus to control power factor correction of a switching power converter, the apparatus comprising:
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means for receiving one or more switching power converter feedback signals; means for generating a pulse width control signal using each processed feedback signal; and means for generating a pulse width modulated, power factor correction (PFC) control signal to control a switch that controls a power factor correction stage of the switching power converter; wherein a pulse width of the PFC control signal varies approximately with a square root of the PWM control signal.
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Specification