초록 ▼

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 f

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.

대표청구항 ▼

1. A circuit, comprising:a control circuit coupled between an energy transfer element, which is coupled to a first power supply input terminal, and a second power supply input terminal, the control circuit further coupled to receive at least feedback information of a power supply output, the control

1. A circuit, comprising:a control circuit coupled between an energy transfer element, which is coupled to a first power supply input terminal, and a second power supply input terminal, the control circuit further coupled to receive at least feedback information of a power supply output, the control circuit to control power delivered to the power supply output from a power supply input in response to said at least feedback information of the power supply output; andan auto-restart circuit coupled to the control circuit to repeatedly enable and disable a 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. 2. The circuit of claim 1, wherein the fault condition is an open loop condition. 3. The circuit of claim 2 wherein the open loop condition is a result of at least one of a power supply output short circuit condition and a power supply overload condition. 4. The circuit of claim 3 wherein the power supply overload condition is caused by a power supply input under-voltage condition. 5. The circuit of claim 1 wherein the control circuit comprises a power switch coupled between the energy transfer element and the second terminal, the power switch switched in response to a switching signal to control the power delivered to the power supply output from the power supply input. 6. The circuit of claim 1 wherein a duration of a first disable period following the detection of the fault condition of the power supply is smaller than durations of subsequent disable periods. 7. The circuit of claim 1 wherein said at least one disable period following the detection or the fault condition of the power supply is a fixed number. 8. The circuit of claim 1 wherein the detection of the fault condition of the power supply occurs after the power supply has been in regulation. 9. The circuit of claim 8 wherein said at least one disable period following the detection of the fault condition of the power supply is a fixed number.