Delay compensation for hysteretic control
First Claim
1. A direct current to direct current (DC-DC) converter comprising:
- a charge switch coupled in between a direct current (DC) voltage input and a switched DC output, wherein the charge switch is switchable to control a duty cycle of the DC voltage input;
a discharge switch coupled in between the switched DC output and a predefined voltage, wherein the discharge switch is switchable to control the duty cycle;
a filter to filter out at least one predefined frequency of the switched DC output and provide a regulated DC output; and
a controller to control the duty cycle, wherein a corresponding delay in switching each one of the charge and discharge switches results in a DC error in the regulated DC output, wherein the controller adjusts the duty cycle of a hysteretic controller by adding a delay compensation downstream of the hysteretic controller to substantially eliminate the DC error.
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Accused Products
Abstract
For controlling a direct current to direct current (DC-DC) converter, a controller individually switches a charge switch and a discharge switch to control a duty cycle, thereby providing a regulated DC output. A delay in switching each one of the charge and discharge switches results in a formation of a DC error in the regulated DC output. The controller adjusts the duty cycle by adding a delay compensation to substantially eliminate the DC error. The delay compensation substantially eliminates the DC error by decreasing an average value of the regulated DC output to offset an increase in the average value of the regulated DC output without the delay compensation.
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Citations
20 Claims
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1. A direct current to direct current (DC-DC) converter comprising:
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a charge switch coupled in between a direct current (DC) voltage input and a switched DC output, wherein the charge switch is switchable to control a duty cycle of the DC voltage input; a discharge switch coupled in between the switched DC output and a predefined voltage, wherein the discharge switch is switchable to control the duty cycle; a filter to filter out at least one predefined frequency of the switched DC output and provide a regulated DC output; and a controller to control the duty cycle, wherein a corresponding delay in switching each one of the charge and discharge switches results in a DC error in the regulated DC output, wherein the controller adjusts the duty cycle of a hysteretic controller by adding a delay compensation downstream of the hysteretic controller to substantially eliminate the DC error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling a direct current to direct current (DC-DC) converter, the method comprising:
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receiving a delay compensation as a predefined function of a time delay in switching a plurality of switches included in the DC-DC converter, wherein the time delay results in a DC error in a regulated output of the DC-DC converter; and adjusting a duty cycle of the DC-DC converter by an addition of the delay compensation downstream of a hysteretic controller to substantially eliminate the DC error by a dynamically calculated correction factor. - View Dependent Claims (14, 15, 16, 17)
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18. An information handling system (IHS) comprising:
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a processor; and a direct current to direct current (DC-DC) converter to provide a current to the processor, wherein the converter includes; a charge switch coupled in between a direct current (DC) voltage input and a switched DC output, wherein the charge switch is switchable to control a duty cycle of the DC voltage input; a discharge switch coupled in between the switched DC output and a predefined voltage, wherein the discharge switch is switchable to control the duty cycle; a filter to filter out at least one predefined frequency of the switched DC output and provide a regulated DC output to the processor; and a controller to control the duty cycle, wherein a corresponding delay in switching each one of the charge and discharge switches results in a DC error in the regulated DC output, wherein the controller adjusts the duty cycle of a hysteretic controller by adding a delay compensation downstream of the hysteretic controller to substantially eliminate the DC error by a dynamically calculated correction factor. - View Dependent Claims (19, 20)
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Specification