Short-circuit protection system for power converters

摘要

One example includes a power converter system. The system includes a switching circuit configured to activate at least one power supply switch in response to a driver signal to provide an output voltage at an output based on an input voltage at an input and based on an inductor current associated with an inductor. The at least one power supply switch includes a parasitic diode that interconnects the inductor and the output. The system also includes a short-circuit protection system configured to detect a short-circuit condition and to deactivate the at least one power supply switch in response to the detection of the short-circuit condition to provide the inductor current from the inductor to the output through the parasitic diode in response to the deactivation of the at least one power supply switch.

主权项

1. A power converter system comprising:
a switching circuit configured to activate at least one power supply switch in response to a driver signal to provide an output voltage at an output based on an input voltage at an input and based on an inductor current associated with an inductor, the at least one power supply switch comprising a parasitic diode and interconnecting the inductor and the output; and a short-circuit protection system configured to detect a short-circuit condition and to deactivate the at least one power supply switch in response to the detection of the short-circuit condition to provide the inductor current from the inductor to the output through the parasitic diode in response to the deactivation of the at least one power supply switch, the parasitic diode increasing a voltage difference across the power supply switch thereby allowing a variable duty cycle of the switching circuit that is at a greater value than a minimum acceptable value.