Granted Patent B2

US 9,397,520 · App. 13/715,389 · Granted Jul 19, 2016

Abstract

Claims (55)

1. A multi-output power supply, comprising:

an input power port for receiving input power;

a first output power port supplying a first voltage derived from the input power that powers a control panel;

a second output power port supplying a second voltage derived from the input power that powers door locks;

a first shut-down circuit configured to shut down the first output power port, independently of the second output power port, if power drawn from the first output power port exceeds a first predetermined value;

a second shut-down circuit configured to shut down the second output power port, independently of the first output power port, if power drawn from the second output power port exceeds a second predetermined value; and

a controller that monitors first indication signals and second indication signals indicating whether the first output power port and the second output power port, respectively, are shut down.

2. The power supply of claim 1 , wherein the shut-down circuit is further configured to shut down the first output power port only when the power draw exceeds the first predetermined value for at least a first predetermined length of time and wherein the second shut-down circuit is further configured to shut down the second output power port only when the power draw exceeds the second predetermined value for at least a second predetermined length of time.

3. The power supply of claim 1 wherein the first and second voltages are different.

4. The power supply of claim 3 , further comprising:

a backup battery bank supplying only the first voltage; and

a converter which converts the battery bank's single voltage to the second voltage, both the first and second voltages being supplied to the first and second output power ports when the input power fails.

5. The power supply of claim 1 , further comprising a monitoring circuit which monitors power draw on the first output power port.

6. The power supply of claim 5 , the monitoring circuit com prising:

a measurement circuit which measures current draw of the first output power port; and

a comparator circuit which compares the current draw with a current limit set point.

7. The power supply of claim 6 , the shut-down circuit comprising:

a switch that shuts down the first output power port if said port's associated current draw exceeds the current limit set point, while the second output power port continues to provide power.

8. The power supply of claim 7 further comprising:

a delay causing the switch to provide power after shutting down for a predetermined period.

9. The power supply of claim 8 wherein the delay circuit will not cause the switch to provide power after a predetermined number of restarts.

10. The power supply of claim 1 , further comprising:

at least a third power output port which is monitored and configured to shut down independently of all other power output ports when its power draw exceeds a respective predetermined limit.

11. The power supply of claim 1 , wherein the controller sets the first predetermined value and the second predetermined value.

12. The power supply of claim 1 , wherein the first voltage is 12 Volts and the second voltage is 24 Volts.

13. The power supply of claim 1 , further comprising a first monitoring circuit which monitors power draw on the first output power port and a second monitoring circuit which monitors power draw on the second output power port, wherein the first monitoring circuit comprises:

a first measurement circuit which measures current draw of the first output power port; and

a first comparator circuit which compares the current draw with a first current limit set point provided by the controller;

wherein the second monitoring circuit comprises

a second measurement circuit which measures current draw of the second output power port; and

a second comparator circuit which compares the current draw with a second current limit set point provided by the controller.

14. The power supply of claim 13 , the shut-down circuit comprising:

a first switch that shuts down the first output power port if said port's associated current draw exceeds the first current limit set point, while the second output power port continues to provide power; and

a second switch that shuts down the second output power port if said port's associated current draw exceeds the second current limit set point, while the first output power port continues to provide power.

15. The power supply of claim 14 further comprising:

a first delay circuit for causing the first switch to provide power after shutting down for a predetermined period; and

a second delay circuit for causing the second switch to provide power after shutting down for a predetermined period.

16. The power supply of claim 1 , wherein the controller monitors and maintains a listing of logged events.

17. The power supply of claim 1 , further comprising an output retry counter that is incremented when the first output power port is shut down, wherein if the output retry counter has not reached an output shutdown maximum number of retries, the first output power port is turned back on after an output shutdown time, or wherein if the output retry counter has reached the output shutdown maximum number of retries, the first output power port remains shut down.

18. A method for supplying multi-output power, comprising:

receiving input power;

via a first output power port, supplying a first voltage derived from the input power to a power control panel;

via a second output power port, supplying a second voltage derived from the input power to power door locks;

shutting down the first output power port, independently of the second output power port, if power drawn from the first output power port exceeds a first predetermined value for a first predetermined length of time; and

monitoring and reporting whether the first output power port and the second output power port are shut down.

19. A multi-output power supply, comprising:

an enclosure with an access door;

a power supply contained within the enclosure; and

a superbright LED contained within the enclosure, said superbright LED indicating a status of the power supply and being visible externally through a dimming filter when the access door is closed, such that when the access door is opened, the brightness of the superbright LED is substantially lessened.

20. A power supply, comprising:

a first output power port, supplying a first voltage derived from the input power to power a control panel;

a second output power port, supplying a second voltage derived from the input power to power door locks;

means for determining if power drawn from the first output power port exceeds a predetermined value for a predetermined length of time;

means for shutting down the first output power port, independently of the second output power port, if power drawn from the first output power port exceeds the predetermined value for the predetermined length of time; and

means for monitoring and reporting whether the first output power port is shut down.

Assignments (8)