Hot-swap circuit system for fan tray module

1. A hot-swap circuit system for fan tray module comprising:

a soft-start circuit module having a voltage input terminal for receiving an input voltage, which comprises:

at least one diode for conducting a current in a single direction,

a first bipolar transistor having an emitter grounded,

a first field effect transistor turned off when the input voltage changes from a non-zero value to a zero value,

a first capacitor having a first terminal electrically connected to a drain of the first field effect transistor and having a second terminal grounded, and discharging when the input voltage changes from the non-zero value to the zero value,

a second capacitor discharging when the input voltage changes from the non-zero value to the zero value, and

a first Zener diode electrically connected to the second capacitor in parallel;

a discharging circuit module electrically connected to the first capacitor in parallel and flowing a discharging current of the first capacitor therethrough;

an over-voltage protection circuit module electrically connected to the first capacitor in parallel; and

an over-current protection circuit module electrically connected to the first capacitor in parallel, and having a voltage output terminal electrically connected to the fan tray module.

2. The hot-swap circuit system as claimed in claim 1 , wherein the discharging circuit module comprises:

a second Zener diode;

a second bipolar transistor; and

a second field effect transistor turned on when the input voltage changes from the non-zero value to the zero value.

3. The hot-swap circuit system as claimed in claim 1 , wherein the over-voltage protection circuit module comprises:

a third Zener diode;

an operational amplifier having a positive power terminal connected to a voltage source and a negative power terminal grounded;

a silicon control rectifier having a gate electrically connected to an output terminal of the operational amplifier;

a third capacitor having one terminal grounded and the other terminal electrically connected to a non-inverted input terminal of the operational amplifier; and

a fourth capacitor having one terminal grounded and the other terminal electrically connected to an inverted input terminal of the operational amplifier.

4. The hot-swap circuit system as claimed in claim 1 , wherein the over-current protection circuit module comprises:

a sensing resistor having one terminal electrically connected to the voltage output terminal;

a fourth Zener diode;

a third bipolar transistor having an emitter grounded;

a fourth bipolar transistor having an emitter electrically connected to the other terminal of the sensing resistor; and

a fifth capacitor electrically connected to the fourth Zener diode in parallel.

5. A hot-swap circuit system for fan tray module comprising:

a voltage input terminal receiving an input voltage from a voltage source;

at least one diode for conducting a current in a single direction;

a bipolar transistor having an emitter grounded;

a first field effect transistor turned off when the input voltage changes from a non-zero value to a zero value;

a second field effect transistor turned on when the input voltage changes from the non-zero value to the zero value;

a first capacitor having one terminal electrically connected to a drain of the second field effect transistor and having the other grounded terminal, and discharging when the input voltage changes from the non-zero value to the zero value;

a second capacitor discharging when the input voltage changes from the non-zero value to the zero value; and

a voltage output terminal electrically connected to the fan tray module.

6. The hot-swap circuit system as claimed in claim 5 , further comprising an over-voltage protection circuit module connected with the first capacitor in parallel.

7. The hot-swap circuit system as claimed in claim 6 , wherein the over-voltage protection circuit module comprises an operational amplifier and a silicon control rectifier which is driven by a voltage output from the operational amplifier.

8. The hot-swap circuit system as claimed in claim 6 , further comprising an over-current protection circuit module electrically connected to the first capacitor in parallel, and having at least one sensing resistor.

9. The hot-swap circuit system as claimed in claim 5 , further comprising an over-current protection circuit module electrically connected to the first capacitor in parallel, and having at least one sensing resistor.

10. The hot-swap circuit system as claimed in claim 5 , further comprising at least one resistor serving as a voltage divider; wherein the resistor has one terminal grounded and the other terminal electrically connected to a base of the bipolar transistor.

11. A hot-swap circuit system for a fan tray module comprising:

a soft-start circuit module activating the fan tray module when the fan tray module is plugged into an application system, and comprising:

a first capacitor discharging when an input voltage of the soft-start circuit module changes from a non-zero value to a zero value;

a first field effect transistor turned off when the input voltage changes from the non-zero value to the zero value;

at least one diode for conducting a current in a single direction;

a bipolar transistor having an emitter grounded; and

a second capacitor discharging when the input voltage changes from the non-zero value to the zero value.

12. The hot-swap circuit system as claimed in claim 11 , wherein the soft-start circuit module further comprises:

at least one resistor serving as a voltage divider and having one terminal grounded;

wherein the bipolar transistor further has a base electrically connected to the other terminal of the resistor.

13. The hot-swap circuit system as claimed in claim 11 , further comprising:

a discharging circuit module electrically connected to the first capacitor in parallel, flowing a discharging current of the first capacitor to a ground.

14. The hot-swap circuit system as claimed in claim 13 , wherein the discharging circuit module comprises a second field effect transistor turned on when the input voltage changes from the non-zero value to the zero value.

15. The hot-swap circuit system as claimed in claim 14 , wherein the first field effect transistor is a p-channel metal oxide semiconductor field effect transistor, and the second field effect transistor is an n-channel depletion metal oxide semiconductor field effect transistor.

16. The hot-swap circuit system as claimed in claim 13 , further comprising an over-voltage protection circuit module electrically connected to the first capacitor in parallel and having an operational amplifier and a silicon control rectifier driven by the operational amplifier.

17. The hot-swap circuit system as claimed in claim 13 , further comprising an over-current protection circuit module electrically connected to the first capacitor in parallel and having a sensing resistor.

18. The hot-swap circuit system as claimed in claim 11 , further comprising an over-voltage protection circuit module electrically connected to the first capacitor in parallel and having an operational amplifier and a silicon control rectifier driven by the operational amplifier.

19. The hot-swap circuit system as claimed in claim 18 , further comprising an over-current protection circuit module electrically connected to the first capacitor in parallel and having a sensing resistor.

20. The hot-swap circuit system as claimed in claim 11 , further comprising:

a discharging circuit module electrically connected to the first capacitor in parallel, flowing a discharging current of the first capacitor to a ground;

an over-voltage protection circuit module electrically connected to the first capacitor in parallel; and

an over-current protection circuit module electrically connected to the first capacitor in parallel.