Off-line converter with digital control
CAFCFirst Claim
1. A circuit for regulating the level at a power converter output, the circuit comprising:
- an input for receiving a feedback signal, the feedback signal having a first feedback state that represents a level that is above a threshold level and a second feedback state that represents a level that is below the threshold level;
an oscillator that provides a duty cycle signal that cycles between two states; 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 duty cycle signal and to a change between the first and second feedback states.
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Accused Products
Abstract
A DC to DC converter comprising an energy storage element comprising an energy storage element input and an energy storage element output, the energy storage element input coupled to receive a first power level and the energy storage element output providing a second power level. The converter also comprises a feedback circuit comprising a feedback input and a feedback output, the feedback input coupled to the energy storage element output. The converter further comprises a regulator circuit comprising a regulator circuit feedback input and a regulator circuit output, the regulator circuit feedback input coupled to the feedback output and the regulator circuit output coupled to the energy storage element input, the regulator circuit regulating the input of the first power level to the energy storage element input. When a signal at the regulator circuit feedback input is above a threshold level the regulator circuit ceasing operation and when the signal at the regulator circuit feedback input is below the threshold level the regulator circuit is enabled.
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Citations
34 Claims
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1. A circuit for regulating the level at a power converter output, the circuit comprising:
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an input for receiving a feedback signal, the feedback signal having a first feedback state that represents a level that is above a threshold level and a second feedback state that represents a level that is below the threshold level;
an oscillator that provides a duty cycle signal that cycles between two states; 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 duty cycle signal and to a change between the first and second feedback states. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A circuit coupled between a power converter input and a power converter output for regulating the level at the power converter output, comprising:
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a switch for selectively enabling or disabling the flow of energy between the power converter input and the power converter output;
an input for receiving a feedback signal, the feedback signal having a first feedback state that represents a level at the power converter output that is above a threshold level and a second feedback state that represents a level at the power converter output that is below the threshold level; and
an oscillator that provides a duty cycle signal that cycles between two states, the circuit operable to control said switch in response to the duty cycle signal and to the feedback signal to enable the flow of energy from the power converter input to the power converter output if the feedback signal is in the second feedback state and disable the flow of energy from the power converter input to the power converter output if the feedback signal is in the first feedback state. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of regulating the level at a power converter output, said power converter having a power converter input and the power converter output, said method comprising:
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receiving a feedback signal, the feedback signal having a first feedback state that represents a level at the power converter output that is above a threshold level and a second feedback state that represents a level at the power converter output that is below the threshold level;
providing a duty cycle signal that cycles between two states; and
in response to the duty cycle signal and to a change between the first and second feedback states, enabling or disabling the flow of energy from the power converter input to the power converter output. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A power converter, comprising:
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a power converter input and a power converter output;
a regulation circuit coupled between the power converter input and the power converter output;
a feedback signal, the feedback signal having a first feedback state that represents a level at the power converter output that is above a threshold level and a second feedback state that represents a level at the power converter output that is below the threshold level; and
an oscillator that provides a duty cycle signal that cycles between two states, the regulation circuit being operable to respond to the duty cycle signal and to a change between the first and second feedback states to enable or disable the flow of energy from the power converter input to the power converter output. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification