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US 2018/0019587 A1Published application
Short circuit protection for data interface charging
AssigneeDialog Semiconductor GmbH
InventorsYimin Chen, Mengfei Liu, Duc Doan, Xiaoyong Zhang, Jianming Yao
Life of this patent
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Abstract
A switching power converter is provided with an overvoltage protection circuit that softly switches on a power bus switch during a soft-start period responsive to a device connecting to a data cable for receiving power over a power bus coupled to the power bus switch.
Claims20
A method, comprising:
- detecting that a device has connected to data cable including a power bus for receiving power from the power bus;
- in a power converter, charging an output capacitor to a power supply voltage, the output capacitor being coupled to the power bus through a power bus switch that is off prior to the expiration of a de-bouncing period following the connection of the device to the data cable;
- softly switching on the power bus switch at a beginning of a soft-start period following the expiration of the de-bouncing period, wherein the power bus switch has a greater resistance while being softly-switched on than when full-switched on;
- and
- switching the power bus switch off during the soft-start period responsive to a determination that the power supply voltage has dropped below a short circuit threshold voltage.
2 more elements
A power converter, comprising:
- an output capacitor having an output node for storing a power supply voltage;
- a power bus switch transistor coupled between the output capacitor output node and a power bus terminal for a power bus, the power bus being contained within a data cable for charging a device;
- and
- a controller configured to softly switch on the power bus switch transistor at a beginning of a soft-start period responsive to a detection that the device has connected to the data cable for receiving power over the power bus, wherein the power bus switch transistor has a greater resistance when softly switched on than when fully switched on, the controller further configured to switch off the power bus switch transistor during the soft-start period responsive to a determination that the power supply voltage has dropped below a short circuit threshold voltage.
1 more element
Dependencies are inferred from the claim text.