METHOD AND APPARATUS FOR DIGITAL CONTROL OF A SWITCHING REGULATOR
First Claim
1. A circuit for regulating a power supply, comprising:
- a switch coupled between first and second terminals, one of the first and second terminals to be coupled to an input of the power supply, the other of the first and second terminals to be coupled to an input of an energy transfer element of the power supply;
an adjustment circuit to be coupled to a third terminal to receive a feedback signal representative of an output level of the power supply to cause a feedback state signal to be generated having a first feedback state that represents an output level that is above a threshold level and a second feedback state that represents an output level that is below the threshold level, the adjustment circuit to adjust the feedback state signal in response to at least one of adjusting the threshold level or adjusting the feedback signal, the adjustment to the feedback state signal tending to cause the feedback state signal to revert from a state at the time of adjustment to a state immediately preceding the adjustment; and
a control circuit coupled to the switch and coupled to receive an oscillating signal and the feedback state signal, the control circuit to control switching of the switch in response to the oscillating signal and the feedback state signal.
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Accused Products
Abstract
Various techniques directed to the digital control of a switching regulator are disclosed. In one aspect, a method for regulating an output level at a power converter output includes receiving a feedback signal representative of the output level at the power converter output. In response to a state of the power converter, at least one of the feedback signal or a threshold level is adjusted. A feedback state signal is generated having a first feedback state that represents that the output level is above the threshold level and a second feedback state that represents that the output level is below the threshold level. A duty cycle signal that cycles is generated. In response to a control signal, energy from a power converter input is enabled or disabled to flow to the power converter output. The control signal is responsive to the duty cycle signal and to a change between the first and second feedback states. The control signal is also responsive to a change between the first and second feedback states.
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Citations
32 Claims
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1. A circuit for regulating a power supply, comprising:
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a switch coupled between first and second terminals, one of the first and second terminals to be coupled to an input of the power supply, the other of the first and second terminals to be coupled to an input of an energy transfer element of the power supply;
an adjustment circuit to be coupled to a third terminal to receive a feedback signal representative of an output level of the power supply to cause a feedback state signal to be generated having a first feedback state that represents an output level that is above a threshold level and a second feedback state that represents an output level that is below the threshold level, the adjustment circuit to adjust the feedback state signal in response to at least one of adjusting the threshold level or adjusting the feedback signal, the adjustment to the feedback state signal tending to cause the feedback state signal to revert from a state at the time of adjustment to a state immediately preceding the adjustment; and
a control circuit coupled to the switch and coupled to receive an oscillating signal and the feedback state signal, the control circuit to control switching of the switch in response to the oscillating signal and the feedback state signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31, 32)
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16. A circuit for regulating an output level of a power converter, the circuit comprising:
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an input coupled to receive a feedback signal representative of the output level of the power converter;
an adjustment circuit coupled to receive the feedback signal to cause a feedback state signal to be generated having first and second feedback states, the first and second feedback states to represent that the output level is above or below, respectively, a threshold level, the adjustment circuit coupled to adjust at least one of the feedback signal or the threshold level to generate the feedback state signal, the adjustment tending to cause the feedback state signal to revert from the state at the time of adjustment to the state immediately preceding the adjustment; and
a switch including a first terminal, a second terminal and a control terminal, said switch being operable to couple or decouple the first terminal and the second terminal in response to a control signal received at the control terminal, the control signal being responsive to the oscillating signal and to a change between the first and second feedback states of the feedback state signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for regulating an output level at a power converter output, comprising:
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receiving a feedback signal representative of the output level at the power converter output;
generating a feedback state signal having a first feedback state that represents that the output level is above a threshold level and a second feedback state that represents that the output level is below the threshold level;
in response to a state of the power converter, adjusting at least one of the feedback signal or a threshold level, the adjustment tending to cause the feedback state signal to revert from a state at the time of adjustment to a state immediately preceding the adjustment;
generating a duty cycle signal that cycles; and
in response to a control signal, enabling or disabling a flow of energy from a power converter input to the power converter output, the control signal being responsive to the duty cycle signal and to a change between the first and second feedback states, the control signal responsive a change between the first and second feedback states. - View Dependent Claims (29, 30)
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Specification