Power factor correction controller with feedback reduction
First Claim
1. A power factor correction (PFC) controller to control power factor correction and regulate output voltage of a switching power converter, wherein the switching power converter includes an inductor to couple to a line input voltage node and a switch coupled to the inductor, the PFC controller comprising:
- an input to receive a feedback signal from the switching power converter;
wherein the PFC controller is configured to cause the switching power converter to operate in discontinuous conduction mode and is further configured to;
(a) determine at least one of;
(i) a line input voltage and (ii) an output voltage of the switching power converter from the feedback signal;
(b) provide a control signal to the switch such that during each period of the switch the switching power converter responds to the control signal and current ramps-up in the inductor for a first time interval when the switch conducts and ramps-down in the inductor for an inductor flyback time interval when the switch is nonconductive;
(c) sensing one or more voltage transients on a gate of the switch to determine the inductor flyback time interval;
(d1) wherein, if the line input voltage is determined in (a), the PFC controller is further configured to determine the output voltage of the switching power converter using the line input voltage, the inductor flyback time interval, and the first time interval;
(d2) wherein, if the output voltage of the switching power converter is determined in (a), the PFC controller is further configured to determine the line input voltage using the output voltage, the inductor flyback time interval, and the first time interval.
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Accused Products
Abstract
A power control system includes a feedback loop having a power factor correction (PFC) and output voltage controller and a switching power converter. The switching power converter includes an inductor to supply charge to an output capacitor and a switch to control inductor current ramp-up times. The PFC and output voltage controller provides a control signal to the switch to control PFC and regulate output voltage of the switching power converter. During a single period of the control signal, the PFC and output voltage controller obtains the line input voltage and output voltage of the switching power converter using a single feedback signal received from the switching power converter.
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Citations
22 Claims
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1. A power factor correction (PFC) controller to control power factor correction and regulate output voltage of a switching power converter, wherein the switching power converter includes an inductor to couple to a line input voltage node and a switch coupled to the inductor, the PFC controller comprising:
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an input to receive a feedback signal from the switching power converter; wherein the PFC controller is configured to cause the switching power converter to operate in discontinuous conduction mode and is further configured to; (a) determine at least one of;
(i) a line input voltage and (ii) an output voltage of the switching power converter from the feedback signal;(b) provide a control signal to the switch such that during each period of the switch the switching power converter responds to the control signal and current ramps-up in the inductor for a first time interval when the switch conducts and ramps-down in the inductor for an inductor flyback time interval when the switch is nonconductive; (c) sensing one or more voltage transients on a gate of the switch to determine the inductor flyback time interval; (d1) wherein, if the line input voltage is determined in (a), the PFC controller is further configured to determine the output voltage of the switching power converter using the line input voltage, the inductor flyback time interval, and the first time interval; (d2) wherein, if the output voltage of the switching power converter is determined in (a), the PFC controller is further configured to determine the line input voltage using the output voltage, the inductor flyback time interval, and the first time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power factor correction (PFC) controller to control power factor correction and regulate output voltage of a switching power converter, wherein the switching power converter includes an inductor to couple to a line input voltage node and a switch coupled to the inductor, the PFC controller comprising:
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an input to receive a feedback signal from the switching power converter; wherein the PFC controller is configured to cause the switching power converter to operate in discontinuous conduction mode and is further configured to; determine a line input voltage; provide a control signal to the switch such that during each period of the switch the switching power converter responds to the control signal and current ramps-up in the inductor for a first time interval when the switch conducts and ramps-down in the inductor for an inductor flyback time interval when the switch is nonconductive; sense one or more voltage transients on a gate of the switch to determine the inductor flyback time interval; and determine the output voltage of the switching power converter using the line input voltage, the inductor flyback time interval, and the first time interval.
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11. A power factor correction (PFC) controller to control power factor correction and regulate output voltage of a switching power converter, wherein the switching power converter includes an inductor to couple to a line input voltage node and a switch coupled to the inductor, the PFC controller comprising:
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an input to receive a feedback signal from the switching power converter; wherein the PFC controller is configured to cause the switching power converter to operate in discontinuous conduction mode and is further configured to; determine an output voltage of the switching power converter from the feedback signal; provide a control signal to the switch such that during each period of the switch the switching power converter responds to the control signal and current ramps-up in the inductor for a first time interval when the switch conducts and ramps-down in the inductor for an inductor flyback time interval when the switch is nonconductive; sense one or more voltage transients on a gate of the switch to determine the inductor flyback time interval; and determine the line input voltage using the output voltage, the inductor flyback time interval, and the first time interval.
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12. A method of controlling power factor correction and regulating output voltage of a switching power converter, wherein the switching power converter includes an inductor to couple to a line input voltage node and a switch coupled to the inductor, the method comprising:
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receiving a feedback signal from the switching power converter; (a) determining at least one of;
(i) a line input voltage and (ii) an output voltage of the switching power converter from the feedback signal;(b) providing a control signal to the switch such that during each period of the switch the switching power converter responds to the control signal and current ramps-up in the inductor for a first time interval when the switch conducts and ramps-down in the inductor for an inductor flyback time interval when the switch is nonconductive; (c) sensing one or more voltage transients on a gate of the switch to determine the inductor flyback time interval; (d1) wherein, if the line input voltage is determined in (a), determining the output voltage of the switching power converter using the line input voltage, the inductor flyback time interval, and the first time interval; (d2) wherein, if the output voltage of the switching power converter is determined in (a), determining the line input voltage using the output voltage, the inductor flyback time interval, and the first time interval; and causing the switching power converter to operate in discontinuous conduction mode. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of controlling power factor correction and regulating output voltage of a switching power converter, wherein the switching power converter includes an inductor to couple to a line input voltage node and a switch coupled to the inductor, the method comprising:
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receiving a feedback signal from the switching power converter; determining a line input voltage; providing a control signal to the switch such that during each period of the switch the switching power converter responds to the control signal and current ramps-up in the inductor for a first time interval when the switch conducts and ramps-down in the inductor for an inductor flyback time interval when the switch is nonconductive; sensing one or more voltage transients on a gate of the switch to determine the inductor flyback time interval; determining an output voltage of the switching power converter using the line input voltage, the inductor flyback time interval, and the first time interval; and causing the switching power converter to operate in discontinuous conduction mode.
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22. A method of controlling power factor correction and regulating output voltage of a switching power converter, wherein the switching power converter includes an inductor to couple to a line input voltage node and a switch coupled to the inductor, the method comprising:
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receiving a feedback signal from the switching power converter; determining an output voltage of the switching power converter from the feedback signal; providing a control signal to the switch such that during each period of the switch the switching power converter responds to the control signal and current ramps-up in the inductor for a first time interval when the switch conducts and ramps-down in the inductor for an inductor flyback time interval when the switch is nonconductive; sensing one or more voltage transients on a gate of the switch to determine the inductor flyback time interval; determining a line input voltage using the output voltage, the inductor flyback time interval, and the first time interval; and causing the switching power converter to operate in discontinuous conduction mode.
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Specification