Method and apparatus for a control circuit with multiple operation modes
First Claim
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1. A power converter comprising:
- a switch coupled to an energy transfer element coupled between an input and an output of the power converter; and
a control circuit coupled to the switch to control the switch, the control circuit including first and second duty cycle control modes to regulate power delivered to the output of the power converter, wherein a transition between the first and second duty cycle control modes is responsive to a magnitude of a current flowing in the switch reaching a current threshold value.
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Abstract
An apparatus for regulating a power converter with multiple operating modes includes a switch coupled to an energy transfer element coupled between an input and an output of the power converter. A control circuit is also included, which is coupled to the switch to control the switch. The control circuit includes first and second duty cycle control modes to regulate power delivered to the output of the power converter. A transition between the first and second duty cycle control modes is responsive to a magnitude of a current flowing in the switch reaching a current threshold value.
115 Citations
47 Claims
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1. A power converter comprising:
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a switch coupled to an energy transfer element coupled between an input and an output of the power converter; and a control circuit coupled to the switch to control the switch, the control circuit including first and second duty cycle control modes to regulate power delivered to the output of the power converter, wherein a transition between the first and second duty cycle control modes is responsive to a magnitude of a current flowing in the switch reaching a current threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power converter comprising:
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a switch coupled to an energy transfer element coupled between an input and an output of the power converter; a control circuit coupled to the switch; and a control loop coupled between the output of the power converter and the control circuit to generate a feedback signal having a control loop gain responsive to an output parameter of the power converter, the control circuit including first and second duty cycle control modes to switch the switch to regulate power delivered to the output of the power converter in response to the feedback signal, wherein the control loop gain is substantially constant during a transition between the first and second duty cycle control modes. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A power converter comprising:
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a switch coupled to an energy transfer element coupled between an input and an output of the power converter; a control circuit coupled to the switch; and a control loop coupled between the output of the power converter and the control circuit to generate a feedback signal having a control loop gain responsive to an output parameter of the power converter, the control circuit including first and second duty cycle control modes to switch the switch to regulate power delivered to the output of the power converter in response to the feedback signal, wherein a switch on time is proportional to a magnitude of the feedback signal when the control circuit operates in the first duty cycle control mode and wherein a switching cycle time period is proportional to the ratio of a switch on time and the value of the feedback signal when the control circuit operates in the second duty cycle control mode. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method of regulating power delivered from an input of a power converter to an output of the power converter, comprising:
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switching a power switch coupled to an energy transfer element coupled between the input and output of the power converter; controlling the switching of the power switch with a control circuit coupled to the switch to regulate the power delivered from the input of a power converter to the output of the power converter; generating a feedback signal to which the control circuit is responsive with a control loop coupled between the output of the power supply and the control circuit, the feedback signal having a control loop gain that is substantially constant during a transition of the control circuit from a first duty cycle control mode included in the control circuit to a second duty cycle control mode included in the control circuit. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification