Systems and methods for self-recycling power

• US 8,354,830 B2
• Filed: 01/31/2012
• Issued: 01/15/2013
• Est. Priority Date: 08/30/2007
• Status: Active Grant

• Current Assignee: Juniper Networks Incorporated
• Original Assignee: Juniper Networks Incorporated
• Inventors: Gill, Jaspal, Owen, David, Che, Thuan
• Primary Examiner(s): Han, Jessica
• Application Number:
  US13/363,157
• Publication Number:
  US 20120126774A1
• Time in Patent Office: 350 Days
• Field of Search: 323/266, 323/271, 323/282, 323/284, 323/288, 323/267, 323/351, 307/125, 307/126, 307/130
• US Class Current: 323/282
• CPC Class Codes: H02J 9/005 using a power saving mode for copiers G03G15/5004

Abstract

A power system includes a switch, a capacitor and a comparator circuit. The power system receives a signal to turn off power supplied to the power system, turns off the switch that is used to supply power to the system and discharges the capacitor. The power system also compares a voltage across the discharging capacitor to a threshold voltage value, and turns on the switch to allow power to be supplied to the power system when the compared voltage across the discharging capacitor equals the threshold voltage value.

Claims

1. A method comprising:

receiving a first signal to recycle power to a power system;

providing the first signal to a gate of a first metal oxide semiconductor field effect transistor (MOSFET) to cause a latch circuit to enter a conducting state;

transmitting a second signal to a port of a controller based on the latch circuit entering the conducting state;

receiving, based on transmitting the second signal, a third signal indicating an existence of a voltage condition associated with the power system;

preventing power from being supplied to the power system based on receiving the third signal;

determining that the third signal is no longer being received; and

allowing power to be supplied to the power system based on the determining.

2. The method of claim 1, where the latch circuit comprises a second MOSFET coupled to the port of the controller.

3. The method of claim 1, where preventing power from being supplied to the power system includes:

opening, based on the latch circuit entering the conducting state, a second MOSFET to cause an energy storage capacitor to discharge; and

where allowing power to be supplied to the power system includes;

causing the first MOSFET to enter a non-conducting state based on discharging the energy storage capacitor, and

opening the second MOSFET to cause power to be supplied to the power system based on the first MOSFET entering the non-conducting state.

4. The method of claim 1, where preventing power from being supplied to the power system includes:

opening, based on the latch circuit entering the conducting state, a second MOSFET to cause a capacitor to discharge; and

where allowing power to be supplied to the power system includes;

determining that a voltage across the capacitor corresponds to a threshold voltage, where the voltage across the capacitor corresponding to the threshold voltage causes the latch circuit to enter a non-conducting state, and

opening the second MOSFET to cause power to be supplied to the power system based on the latch circuit entering the non-conducting state.

5. The method of claim 1, where the first signal is received by a first switch, the method further comprising:

closing, based on receiving the first signal, the first switch to cause the second signal to be received at a port of a controller of the power system.

6. The method of claim 1,

where preventing the power from being supplied to the power system includes:

opening a second switch to prevent the power from being supplied to the power system further based on the latch circuit entering the conducting state, and

preventing the second switch from closing based on the latch circuit being in the conducting state.

7. The method of claim 1,

where the port of the controller is electrically coupled to a drain of the first MOSFET.

8. A device comprising:

a controller to;

detect an existence of a voltage condition associated with an electronic assembly of the device, the controller detecting the existence of the voltage condition when a latch circuit transitions from a first non-conducting state to a first conducting state,

control a first metal oxide semiconductor field effect transistor (MOSFET), based on detecting the existence of the voltage condition, the controller controlling the first MOSFET to enter;

a second conducting state that allows power to be supplied to the electronic assembly, when the controller does not detect the voltage condition, and

a second non-conducting state that prevents power from being supplied to the electronic assembly, when the controller detects the voltage condition,

a capacitor to;

store energy received via the first MOSFET, when the first MOSFET enters the second conducting state, and

discharge the stored energy when the first MOSFET enters the second non-conducting state;

a circuit to;

receive a signal to recycle the supply of power,

cause the latch circuit to enter the first conducting state based on receiving the signal to recycle the supply of power,

determine that a voltage across the capacitor corresponds to a threshold voltage based on the capacitor discharging the stored energy, and

cause the latch circuit to enter the first non-conducting state based on the voltage across the capacitor corresponding to the threshold voltage.

9. The device of claim 8, where the latch circuit includes a second MOSFET coupled to a port of the controller.

10. The device of claim 8, where the circuit includes:

a voltage comparator circuit to;

determine that the voltage across the capacitor corresponds to the threshold voltage, and

cause the latch circuit to enter the first non-conducting state when the voltage across the capacitor corresponds to the threshold voltage.

11. The device of claim 8, where the circuit includes:

a transistor, where a base of the transistor is electrically coupled to a negative terminal of the capacitor via a first diode, and an emitter of the transistor is electrically coupled to a positive terminal of the capacitor via a second diode,

where, when the capacitor corresponds the threshold voltage, the transistor causes the latch circuit to enter the first non-conducting state.

12. The device of claim 8, where the circuit includes:

a second MOSFET coupled to the controller and the latch circuit, the second MOSFET to;

receive the signal to recycle the supply of power, where the second MOSFET enters a third conducting state in response to receiving the signal to recycle the supply of power, and

cause the latch circuit to enter the first conducting state based on the second MOSFET entering the third conducting state.

13. The device of claim 12, where the second MOSFET is further to:

prevent the first MOSFET from entering the second conducting state while the second MOSFET is in the third conducting state.

14. The device of claim 12, where the second MOSFET is further to:

enter a third non-conducting state based on the voltage across the capacitor corresponding to the threshold voltage, and

cause the latch circuit to enter the first non-conducting state based on the second MOSFET entering the third non-conducting state.

15. A device comprising:

a circuit to;

receive a first signal to recycle power to the circuit,

cause a latch circuit to allow energy stored in a capacitor to be conducted to a first switching device,

transmit a signal to a port of a controller based on the latch circuit allowing the energy stored in the capacitor to be conducted to the first switching device,

determine, based on the controller receiving the signal at the port, an existence of a voltage condition within the circuit,

prevent power from being supplied to the circuit based on determining the existence of the voltage condition,

determine that the voltage condition no longer exists, and

allow power to be supplied to the power system based on the determining.

16. The device of claim 15, where, when preventing power from being supplied to the circuit, the circuit is to:

turn on, based on the latch circuit allowing the energy stored in the capacitor to be conducted to the first switching device, a second switching device to prevent the power from being supplied to the circuit, where turning on the second switching device causes the capacitor to discharge, and

where, when allowing power to be supplied to the circuit, the circuit is to;

turn off the first switching device based on discharging the energy storage capacitor, where, when turned off, the first switching device prevents power from being conducted through the first switching device, and

turn on the second switching device to cause power to be supplied to the circuit, where turning off the first switching device causes the second switching device to be turned on.

17. The device of claim 15, where, when preventing power from being supplied to the circuit, the circuit is to:

turn off, based on the latch circuit allowing the energy stored in the capacitor to be conducted to the first switching device, a second switching device to cause the capacitor to discharge, and

where, when allowing power to be supplied to the circuit, the circuit is to;

determine that a voltage across the capacitor corresponds to a threshold voltage, where the voltage across the capacitor corresponding to the threshold voltage causes the latch circuit to prevent the energy stored in the capacitor to be conducted to the first switching device, and

turn off the first switching device to cause power to be supplied to the circuit based on the latch circuit preventing the energy stored in the capacitor to be conducted to the first switching device.

18. The device of claim 17, where, when allowing power to be supplied to the circuit, the circuit is to:

turn on the second switching device, and

determine that the voltage condition no longer exists based on turning off the first switching device.

19. The device of claim 15, where the circuit includes a metal oxide semiconductor field effect transistor (MOSFET) that receives the first signal at a gate of the MOSFET to drive the gate to a high voltage state,

where a drain of the MOSFET is coupled to the port of the controller of the circuit,

where driving the gate to the high voltage state causes the port of the controller to be pulled to a low voltage state, and

where the existence of the voltage condition is determined based on the port of the controller being pulled to the low voltage state.