AC and persistent DC co-distritbution

1. An apparatus adapted to provide a persistent DC power, the apparatus comprising:

an AC input port coupled to an AC power supply;

a DC input port coupled to an external DC power, wherein the external DC power is regulated in accordance with a first reference voltage to generate a regulated DC voltage;

a DC output port;

an AC-to-DC converter (ADC) adapted to convert the AC power supply to a converted DC voltage in accordance with the first reference voltage; and

a control circuit adapted to monitor the external DC power, said control circuit adapted to:

enable the regulated DC voltage to be delivered to the DC output port when the external DC power is detected as being higher than a second reference voltage, and

enable the converted DC voltage to be delivered to the DC output port when the external DC power is detected as being lower than the second reference voltage.

2. The apparatus of claim 1 wherein the second reference voltage is higher than the first reference voltage.

3. The apparatus of claim 1 wherein a phase line and a neutral associated with the AC power supply are applied to the ADC.

4. The apparatus of claim 1 wherein a first phase line and a second phase line in the AC power supply are applied to the ADC.

5. The apparatus of claim 1 wherein the control circuit further comprises:

a first switch and a second DC switch; and

a first monitoring device adapted to compare the external DC power to the second reference voltage, wherein

when output of the first monitoring device is high, the first DC switch connects the regulated DC voltage to the DC output port and the second DC switch disconnects the converted DC voltage from the DC output port, and

when output of the first monitoring device is low, the first DC switch disconnects the regulated DC voltage from the DC output port and the second DC switch connects the converted DC voltage to the DC output port.

6. The apparatus of claim 1 further comprising:

a power mux; and

a comparator adapted to compare a received voltage to the second reference voltage, wherein:

when an output of the comparator is high, the regulated DC voltage is delivered to the DC output port, and

when an output of the comparator is low, the converted DC voltage is delivered to the DC output port.

7. The apparatus of claim 1 wherein the apparatus is formed using discrete devices and has a modular form factor.

8. The apparatus of claim 1 wherein the apparatus is assembled in a multi-chip package.

9. The apparatus of claim 1 wherein the apparatus is fabricated as one or more integrated circuits.

10. The apparatus of claim 9 wherein the one or more integrated circuits are disposed in a power panel to provide a plurality of persistent DC powers for delivery to external devices.

11. The apparatus of claim 1 further comprising:

an AC power switch;

and a second monitoring device adapted to:

enable the AC power supply to the ADC when the external DC power is detected as being lower than a third reference voltage, and

inhibit the AC power supply to the ADC when the DC voltage is detected as being higher than the third reference voltage.

12. The apparatus of claim 1 wherein the first reference voltage is programmable to adjust an output voltage of the apparatus.

13. The apparatus of claim 11 wherein the third reference voltage is higher than the second reference voltage and the second reference voltage is higher than the first reference voltage.

14. The apparatus of claim 11 wherein at least one of the first reference voltage, the second reference voltage or the third reference voltage is programmable.

15. The apparatus of claim 11 wherein the first and second reference voltages are generated from the third reference voltage and are smaller than the third reference voltage.

16. A power panel comprising:

an AC power input port coupled to phase lines and a neutral line associated with a received AC power;

a DC power input port coupled to a received DC power;

a plurality of DC circuit breakers coupled to a plurality of DC power distribution circuits, and

one or more DC modules each comprising:

an AC interface input port module coupled to the AC power input port;

a DC interface input port module coupled to the DC power input port;

a DC interface output port module coupled to the plurality of DC circuit breakers;

an AC-to-DC converters (ADC) adapted to convert the received AC power from the AC interface port to one or more converted DC voltages;

a voltage regulator adapted to convert the received DC power from the DC interface port to a regulated DC voltage; and

a control circuit adapted to:

couple the regulated DC voltage to and decouple the converted DC voltage from the DC interface output port when the received DC power is detected as being higher than a first reference voltage, wherein the converted DC voltage is at same voltage level as the regulated DC voltage, and

couple the converted DC voltage to and decouple the regulated DC voltage from the DC interface output port when the received DC power is detected as being lower than the first reference voltage.

17. The power panel of claim 16 wherein the power panel delivers two different DC voltages to one of the plurality of DC power distribution circuits.

18. The power panel of claim 16 further comprising:

a plurality of AC circuit breakers coupled to a plurality of AC power distribution circuits, said plurality of AC circuit breakers receiving AC power from the AC power input port.

19. The power panel of claim 16 wherein the AC power input port and the DC module are coupled to the plurality of AC circuit breakers, wherein the plurality of DC circuit breakers are interchangeable with the plurality of AC circuit breakers to reconfigure the plurality of AC power distribution circuits and the plurality of DC power distribution circuits.

20. The power panel of claim 16 wherein the power panel is reconfigurable as an AC-only power panel, a DC-only power panel, or an AC and DC co-existing power panel.