Voltage Regulator Bypass Resistance Control
First Claim
1. A method of controlling a bypass resistance of a voltage regulator, comprising:
- generating a regulated output voltage based upon a switching voltage;
generating the switching voltage through controlled closing and opening of a series switch element and a shunt switch element, the series switch element and the shunt switch element being connected between voltages based on an input voltage;
providing a control of a duty cycle of the switching voltage by sensing and feeding back the regulated output voltage;
controlling the bypass resistance based on a parameter related to the duty cycle, wherein the control of the duty cycle is persistent during the control of the bypass resistance.
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Accused Products
Abstract
Embodiments for at least one method and apparatus of controlling a bypass resistance of a voltage regulator are disclosed. One method includes generating a regulated output voltage based upon a switching voltage. The switching voltage is generated through controlled closing and opening of a series switch element and a shunt switch element, the series switch element and the shunt switch element being connected between voltages based on an input voltage. A control of a duty cycle of the switching voltage is provided by sensing and feeding back the regulated output voltage. The bypass resistance is controlled based on a parameter related to the duty cycle, wherein the control of the duty cycle is persistent during the control of the bypass resistance.
66 Citations
28 Claims
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1. A method of controlling a bypass resistance of a voltage regulator, comprising:
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generating a regulated output voltage based upon a switching voltage; generating the switching voltage through controlled closing and opening of a series switch element and a shunt switch element, the series switch element and the shunt switch element being connected between voltages based on an input voltage; providing a control of a duty cycle of the switching voltage by sensing and feeding back the regulated output voltage; controlling the bypass resistance based on a parameter related to the duty cycle, wherein the control of the duty cycle is persistent during the control of the bypass resistance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a bypass resistance of a voltage regulator, comprising:
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generating a regulated output voltage based upon a switching voltage; generating the switching voltage through controlled closing and opening of a series switch element and a shunt switch element, the series switch element and the shunt switch element being connected between voltages based on an input voltage; providing a control of a duty cycle of the switching voltage by sensing and feeding back the regulated output voltage; controlling the bypass resistance based on a parameter related to the duty cycle, wherein the bypass resistance is controllable over more than two values. - View Dependent Claims (13, 14, 15)
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16. A voltage regulator, comprising:
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a series switch element and a shunt switch element connected between voltages based on an input voltage; means for generating a switching voltage through controlled closing and opening of the series switch element and the shunt switch element; means for generating a regulated output voltage based upon a switching voltage; a duty cycle controller for controlling a duty cycle of the switching voltage by sensing and feeding back the regulated output voltage; a bypass resistance coupled between the input voltage and the regulated output voltage; and means for controlling the bypass resistance based on a parameter related to the duty cycle, wherein the control of the duty cycle is persistent during the control of the bypass resistance. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A voltage regulator, comprising:
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a series switch element and a shunt switch element connected between voltages based on an input voltage; means for generating a switching voltage through controlled closing and opening of the series switch element and the shunt switch element; means for generating a regulated output voltage based upon a switching voltage; a duty cycle controller for controlling a duty cycle of the switching voltage by sensing and feeding back the regulated output voltage; a bypass resistance coupled between the input voltage and the regulated voltage; and means for controlling the bypass resistance based on a parameter related to the duty cycle, wherein the bypass resistance is controllable over more than two values. - View Dependent Claims (26, 27)
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28. A voltage regulator, comprising:
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a series switch element and a shunt switch element connected between voltages based on an input voltage; means for generating a switching voltage through controlled closing and opening of the series switch element and the shunt switch element; means for generating a regulated output voltage based upon a switching voltage; a pulse-width modulation loop operative to control a duty cycle of the switching voltage by sensing and feeding back the regulated output voltage; a bypass resistance coupled between the input voltage and the regulated output voltage; and a bypass control loop operative to control the bypass resistance based on a parameter related to the duty cycle, wherein a response time of the pulse-width modulation loop is faster than a response time of the bypass control loop.
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Specification