Method and apparatus for fault condition protection of a switched mode power supply
First Claim
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1. A power supply circuit, comprising:
- a first terminal to be coupled to an energy transfer element having an energy transfer element input and output, the energy transfer element input coupled to a first terminal of a power supply input;
a second terminal to be coupled to a second terminal of the power supply input;
a third terminal to be coupled to receive at least feedback information of a power supply output;
a control circuitry coupled to the first, second and third terminals, the control circuitry to control power delivered to the power supply output from the power supply input in response to said at least feedback information of the power supply output; and
an auto-restart circuit coupled to the third terminal and the control circuitry, the auto-restart circuit coupled to the control circuitry to repeatedly enable and disable the power supply during a fault condition, wherein a duration of at least one disable period following a detection of a fault condition of the power supply is smaller than durations of subsequent disable periods.
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Abstract
Methods and apparatuses for fault condition protection of a switched mode power supply. In one aspect of the invention, a power supply circuit having an auto-restart function to turn the power supply on and off repeatedly under fault conditions is included. In one embodiment, one or more off-times following detection of a fault condition is smaller than subsequent off-times.
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Citations
26 Claims
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1. A power supply circuit, comprising:
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a first terminal to be coupled to an energy transfer element having an energy transfer element input and output, the energy transfer element input coupled to a first terminal of a power supply input;
a second terminal to be coupled to a second terminal of the power supply input;
a third terminal to be coupled to receive at least feedback information of a power supply output;
a control circuitry coupled to the first, second and third terminals, the control circuitry to control power delivered to the power supply output from the power supply input in response to said at least feedback information of the power supply output; and
an auto-restart circuit coupled to the third terminal and the control circuitry, the auto-restart circuit coupled to the control circuitry to repeatedly enable and disable the power supply during a fault condition, wherein a duration of at least one disable period following a detection of a fault condition of the power supply is smaller than durations of subsequent disable periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power supply, comprising:
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an energy transfer element having an energy transfer element input and an energy transfer element output, the energy transfer element input coupled to a first terminal of an input of the power supply, the energy transfer element output coupled to an output of the power supply;
a power supply controller including a power switch coupled between the energy transfer element input and a second terminal of the input of the power supply, the power supply controller further coupled to the energy transfer element output, a feedback signal generated in response to the energy transfer element output, the power switch switched to modulate power delivered to the output of the power supply from the input of the power supply in response to the feedback signal; and
an auto restart circuit included in the power supply controller coupled to repeatedly enable and disable the power supply during a power supply fault condition, wherein a fixed number of disable periods following a detection of the power supply fault condition after the power supply has been in regulation have smaller durations than durations of subsequent disable periods. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method, comprising:
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regulating a delivery of power from a power supply input to a power supply output;
detecting a fault condition in the power supply; and
repeatedly enabling and disabling the power supply during the fault condition until the fault condition is no longer present in the power supply, wherein a duration of one or more disable periods follow the detection of the fault condition in the power supply is smaller than a duration of subsequent disable periods. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification