OUTPUT SHORT CIRCUIT PROTECTING DEVICE

摘要

An output short circuit protecting device electrically connected to a power supplying device includes a first output short circuit protecting unit. The first output short circuit protecting unit includes a sensing unit, a comparing unit, a judging element, and a latching unit. The sensing unit is electrically connected to a switching unit, a first outputting resistor, and a second outputting resistor of the power supplying device. The comparing unit is electrically connected to the sensing unit. The judging element is electrically connected to the comparing unit, and a controller and a signal-controlling terminal of the power supplying device. The latching unit is electrically connected to the judging element and the signal-controlling terminal.

主权项

1. An output short circuit protecting device comprising electrically connected to a power supplying device and an electronic system, the power supplying device comprising an alternative current to direct current power converting module, a controller, a switching element, a first outputting resistor, a second outputting resistor, a third outputting resistor, a first electricity outputting terminal, a second electricity outputting terminal, a standby electricity outputting terminal, a signal-controlling terminal, and a signal-resetting terminal, the AC to DC power converting module comprising a DC electricity outputting terminal, the switching element electrically connected to the DC electricity outputting terminal and the signal-controlling terminal, the first outputting resistor electrically connected to the switching element and the first electricity outputting terminal, the second outputting resistor electrically connected to the switching element and the second electricity outputting terminal, the third outputting terminal electrically connected to the DC electricity outputting terminal and the standby electricity outputting terminal, the first electricity outputting terminal, the second electricity outputting terminal, and the standby electricity outputting terminal electrically connected to the electronic system, respectively, the output short circuit protecting device comprising:
a first outputting short circuit protecting module electrically connected to the first outputting resistor and the second outputting resistor, the first outputting short circuit protecting module comprising: a sensing unit electrically connected to the switching element, the first outputting resistor, and the second outputting resistor; a comparing unit electrically connected to the sensing unit; a judging element electrically connected to the comparing unit, the controller, and the signal-controlling terminal; and a latching unit electrically connected to the judging unit, the signal-controlling terminal, and the signal-resetting terminal, wherein the sensing unit senses voltages across the first outputting resistor and the second outputting resistor, the comparing unit respectively determines whether the voltages across the first outputting resistor and the second outputting resistor is larger than a predetermined value or not, the judging element sends a signal to latching unit for latching the signal-controlling terminal and driving the switching element cut off if one of the voltages across the first outputting resistor and the second outputting resistor is larger than the predetermined value, so that the first electricity outputting terminal and the second electricity outputting terminal stop outputting electricity to the electronic system.