Method and apparatus for high-side input winding regulation
First Claim
1. A power supply controller for use in a power supply, comprising:
- a power switch coupled between first and second terminals, the first terminal to be coupled to a positive input supply rail of the power supply, the second terminal to be coupled to an energy transfer element input of the power supply;
a sampling circuit coupled to a third terminal, the sampling circuit coupled to sample a signal across the energy transfer element input of the power supply during an off time of the power switch to provide a sampled output of the power supply, wherein the sampled output of the power supply is disabled from being resampled by the sampling circuit during an on time of the power switch;
a switch conduction scheduling circuit coupled to the power switch and coupled to the sampling circuit; and
a control circuit coupled to the sampling circuit and the power switch, the control circuit coupled to switch the power switch in response to the sampled output of the power supply.
1 Assignment
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Accused Products
Abstract
A power supply control circuit for use in a power supply is disclosed. An example power supply control circuit includes a power switch coupled between first and second terminals. The first terminal is to be coupled to a positive input supply rail of the power supply. The second terminal is to be coupled to an energy transfer element input of the power supply. A sampling circuit is coupled to a third terminal. The sampling circuit coupled to sample a signal across the energy transfer element input of the power supply during an off time of the power switch to provide a sampled output of the power supply. The sampled output of the power supply is disabled from being be resampled by the sampling circuit during an on time of the power switch. A control circuit coupled to the sampling circuit and the power switch, the control circuit coupled to switch the power switch in response to the sampled output of the power supply.
33 Citations
28 Claims
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1. A power supply controller for use in a power supply, comprising:
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a power switch coupled between first and second terminals, the first terminal to be coupled to a positive input supply rail of the power supply, the second terminal to be coupled to an energy transfer element input of the power supply; a sampling circuit coupled to a third terminal, the sampling circuit coupled to sample a signal across the energy transfer element input of the power supply during an off time of the power switch to provide a sampled output of the power supply, wherein the sampled output of the power supply is disabled from being resampled by the sampling circuit during an on time of the power switch; a switch conduction scheduling circuit coupled to the power switch and coupled to the sampling circuit; and a control circuit coupled to the sampling circuit and the power switch, the control circuit coupled to switch the power switch in response to the sampled output of the power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power supply, comprising:
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an energy transfer element having an energy transfer element input and an energy transfer element output; a power switch coupled between a positive input supply rail of the power supply and the energy transfer element input; a sampling circuit coupled to sample a signal across the energy transfer element input during an off time of the power switch to provide a sampled output of the power supply, wherein the sampled output of the power supply is disabled from being resampled by the sampling circuit during an on time of the power switch; a switch conduction scheduling circuit coupled to the power switch and coupled to the sampling circuit, the switch conduction scheduling circuit coupled to disable the power switch from being switched for one or more subsequent consecutive clock cycles in response to the sampled output of the power supply being greater than a threshold value; and a control circuit coupled to the sampling circuit and the power switch, the control circuit coupled to switch the power switch in response to the sampled output of the power supply. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of controlling a power supply, comprising:
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switching a power switch coupled between a positive input supply rail and an energy transfer element input of an energy transfer element; transferring energy from the energy transfer element input to an energy transfer element output in response to the switching of the switch; reflecting a signal from across the energy transfer element output to across the energy transfer element input during an off time of the power switch; sampling the signal from across the energy transfer element input during the off time of the power switch to provide a sampled output of the power supply; disabling the sampled output of the power supply from being resampled during an on time of the power switch; disabling the power switch from being switched for one or more subsequent consecutive clock cycles with a switch conduction scheduling circuit in response to the sampled output of the power supply being greater than a threshold value; and controlling the switching of the power switch in response to the sampled output of the power supply. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification