Short-circuit protection circuit and electronic device

摘要

A short-circuit protection circuit to execute a short-circuit protection for a LED module of an electronic device. The LED module includes a positive input port. the short-circuit protection circuit includes a control unit for controlling the LED module to work or do not work, a feedback module, a comparison module, and a trigger module. The feedback module is connected between the positive input port of the LED module and ground, and is used to detect a voltage of the positive input port and produce a feedback voltage proportional to the voltage of the positive input port. The comparison module produces a first comparison signal when comparing the feedback voltage is less than a reference voltage. The trigger module produces an off trigger signal to trigger the control unit to control the LED module to not work, when receiving the first comparison signal.

主权项

1. An electronic device comprising:
a power source; a LED module; and a short-circuit protection circuit; wherein, the LED module comprises a positive input port and a controlled port; the power source comprises an output port; the short-circuit protection circuit comprises a control unit, the control unit comprises a power port and a control port; the output port of the power source is connected to the positive input port of the LED module and the power port of the control unit, and configured to provide power to the LED module and the control unit via the output port; the control port of the control unit is connected to the controlled port of the LED module, the control unit is configured to control the LED module to work or do not work; wherein, the control unit further comprises a trigger port, the short-circuit protection circuit further comprises: a feedback module connected between the positive input port of the LED module and ground, configured to detect a voltage of the positive input port and produce a feedback voltage proportional to the voltage of the positive input port; a comparison module connected to the feedback module, configured to compare the feedback voltage with a reference voltage and produce a first comparison signal when the feedback voltage is less than the reference voltage; and a trigger module connected to the comparison module and the trigger port of the control unit, configured to produce an off trigger signal to the trigger port of the control unit to trigger the control unit to control the LED module to not work, when the trigger module receives the first comparison signal output by the comparison module.