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An apparatus for power source protection with automatic latch-off is provided for use in an electronic apparatus. The electronic apparatus includes a power supply and a main functional circuit, such as a notebook computer. The power supply is coupled to the main functional circuit via an electronic

An apparatus for power source protection with automatic latch-off is provided for use in an electronic apparatus. The electronic apparatus includes a power supply and a main functional circuit, such as a notebook computer. The power supply is coupled to the main functional circuit via an electronic switching device, so as to power the main functional circuit via a power source terminal of the electronic switching device. The apparatus for power source protection with automatic latch-off includes a low-voltage-triggered latch-off device and a low-voltage-triggered responding device. The low-voltage-triggered latch-off device is coupled to the electronic switching device, so as to control the on or off state of the electronic switching device. The low-voltage-triggered responding device is coupled to the power source terminal and the low-voltage-triggered latch-off device. When a short circuit occurs, the low-voltage-triggered responding device can enable the latch-off device to turn off the electronic switching device, so as to cut off the power supply to the main functional circuit.

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1. An apparatus for power source protection with automatic latch-off, for use in an electronic apparatus, the electronic apparatus including a power supply and an electronic switching device coupled to the power supply, wherein the electronic switching device has a power source terminal, and the ele

1. An apparatus for power source protection with automatic latch-off, for use in an electronic apparatus, the electronic apparatus including a power supply and an electronic switching device coupled to the power supply, wherein the electronic switching device has a power source terminal, and the electronic apparatus is powered through the power source terminal, the apparatus for power source protection with automatic latch-off comprising:a low-voltage-triggered latch-off device, coupled to the electronic switching device, for turning off the electronic switching device when the power source terminal is short-circuited; and a low-voltage-triggered responding device, coupled to the power source terminal and the low-voltage-triggered latch-off device, wherein the low-voltage-triggered responding device enables the low-voltage-triggered latch-off device to turn off the electronic switching device when the power source terminal is short-circuited. 2. The apparatus for power source protection with automatic latch-off as recited in claim 1, wherein the electronic switching device is a transistor.3. The apparatus for power source protection with automatic latch-off as recited in claim 2, wherein the transistor is a metal oxide semiconductor field effect transistor (MOSFET).4. The apparatus for power source protection with automatic latch-off as recited in claim 3, wherein the metal oxide semiconductor field effect transistor is of N-type.5. The apparatus for power source protection with automatic latch-off as recited in claim 3, wherein the metal oxide semiconductor field effect transistor is of P-type.6. The apparatus for power source protection with automatic latch-off as recited in claim 1, wherein the low-voltage-triggered responding device comprises:a transistor switching device, couple to the low-voltage-triggered latch-off device; and a biasing device, coupled to the transistor switching device and the power source terminal, for biasing the transistor switching device. 7. The apparatus for power source protection with automatic latch-off as recited in claim 6, wherein the biasing device includes a Zener diode and a resistor in series connection with the Zener diode.8. The apparatus for power source protection with automatic latch-off as recited in claim 6, wherein the transistor switching device is a bipolar junction transistor (BJT).9. An apparatus for power source protection with automatic latch-off, for use in an electronic apparatus, the electronic apparatus including a power supply and an electronic switching device coupled to the power supply, wherein the electronic switching device has a power source terminal, and the electronic apparatus can be powered through the power source terminal, the apparatus for power source protection with automatic latch-off comprising:a latch-off device, coupled to the electronic switching device, for turning off the electronic switching device; a power storage device, coupled to the latch-off device and the power supply, for storing energy so as to provide an activation power for activating the latch-off device; and a low-voltage responding device, coupled to the power source terminal and the power storage device, wherein the low-voltage responding device enables the activation power to be fed into the latch-off device, so as to turn off the electronic switching device when the power source terminal is short-circuited. 10. The apparatus for power source protection with automatic latch-off as recited in claim 9, wherein the latch-off device is a transistor switch.11. The apparatus for power source protection with automatic latch-off as recited in claim 10, wherein the transistor is a bipolar junction transistor (BJT).12. The apparatus for power source protection with automatic latch-off as recited in claim 9, wherein the power storage device is an RC circuit.13. The apparatus for power source protection with automatic latch-off as recited in claim 9, wherein the electronic switching device is a transistor.14. The apparatus for power source protection with automatic latch-off as recited in claim 13, wherein the transistor is a metal oxide semiconductor field effect transistor.15. The apparatus for power source protection with automatic latch-off as recited in claim 14, wherein the metal oxide semiconductor field effect transistor is of N-type.16. The apparatus for power source protection with automatic latch-off as recited in claim 14, wherein the metal oxide semiconductor field effect transistor is of P-type.17. The apparatus for power source protection with automatic latch-off as recited in claim 9, wherein the responding device comprises:a transistor switching device, coupled to the low-voltage-triggered latch-off device; and a biasing device, coupled to the transistor switching device and the power source terminal, for biasing the transistor switching device. 18. The apparatus for power source protection with automatic latch-off as recited in claim 17, wherein the biasing device includes a Zener diode and a resistor coupled to the Zener diode in series.19. The apparatus for power source protection with automatic latch-off as recited in claim 17, wherein the transistor switching device is a bipolar junction transistor (BJT).20. The apparatus for power source protection with automatic latch-off as recited in claim 9, wherein the electronic apparatus is a notebook computer.