Mobile power system with bidirectional AC-DC converter and related platforms and methods
A mobile power system may include a bidirectional AC-DC converter configured to convert a grid AC signal to a power limited DC charging signal with a threshold level, a battery module configured to provide a DC power signal, and a controller coupled to the battery module and the bidirectional AC-DC converter and configured to selectively switch the bidirectional AC-DC converter between a first state and a second state. The first state may include, when a load power level is less than the threshold level, concurrently charging the battery module using the power limited DC charging signal and delivering the grid AC signal to a load. The second state may include, when the load power level is greater than the threshold level, concurrently converting the DC power signal with the bidirectional AC-DC converter into a battery AC signal for delivery to the load, and delivering the grid AC signal to the load.
1. A mobile power system comprising:
a bidirectional alternating current-direct current (AC-DC) converter configured to convert a grid AC signal to a power limited DC charging signal with a threshold level;
a battery module configured to provide a DC power signal;
a controller coupled to said battery module and said bidirectional AC-DC converter and configured to selectively switch said bidirectional AC-DC converter between a first state and a second state; and
at least one switching circuit coupled between said battery module and said bidirectional AC-DC converter and comprising
a first switch, and
a diode pair coupled in parallel to said first switch, each diode of said diode pair having respective cathode terminals coupled together;
the first state comprising, when a load power level is less than the threshold level, concurrently charging said battery module using the power limited DC charging signal and delivering the grid AC signal to a load;
the second state comprising, when the load power level is greater than the threshold level, concurrently converting the DC power signal with said bidirectional AC-DC converter into a battery AC signal for delivery to the load, and delivering the grid AC signal to the load.
2. The mobile power system of claim 1 wherein said controller is configured to selectively switch said bidirectional AC-DC converter between a third state, and a fourth state; wherein the third state comprises, when said battery module is fully charged, and when the load power level is less than the threshold level, delivering the grid AC signal to the load and placing said bidirectional AC-DC converter in a stand-by state; and wherein the fourth state comprises when the power limited DC charging signal is unavailable, converting the DC power signal with said bidirectional AC-DC converter into the battery AC signal for delivery to the load.
3. The mobile power system of claim 1 wherein said at least one switching circuit comprises first and second switching circuits coupled between said battery module and said bidirectional AC-DC converter.
4. The mobile power system of claim 3 wherein said diode pair comprises a pair of Zener diodes.
5. The mobile power system of claim 3 wherein each of said first switching circuit and said second switching circuit comprises a second switch and a resistor coupled in series; and wherein said second switch and said resistor being coupled in parallel to said first switch.
6. The mobile power system of claim 5 wherein each of said first switching circuit and said second switching circuit comprises a current limiting element coupled between said battery module and said first switch.
7. The mobile power system of claim 1 wherein the load comprises a plurality of loads; and further comprising an AC distribution circuit coupled to said bidirectional AC-DC converter and configured to deliver a plurality of AC signals respectively to the plurality of loads.
8. The mobile power system of claim 1 wherein said controller comprises a battery management device configured to monitor a plurality of parameters related to said battery module.
9. The mobile power system of claim 8 wherein the plurality of parameters comprises a total voltage value, voltage values of individual battery cells, a temperature value, a state of charge (SOC) value, a state of health (SOH) value, and a current value.
10. A mobile vehicle platform comprising:
a vehicle body;
a plurality of loads carried by said vehicle body; and
a mobile power system carried by said vehicle body and powering said plurality of loads, said mobile power system comprising
a bidirectional alternating current-direct current (AC-DC) converter configured to convert a grid AC signal to a power limited DC charging signal with a threshold level,
a battery module configured to provide a DC power signal, and
a controller coupled to said battery module and said bidirectional AC-DC converter and configured to selectively switch said bidirectional AC-DC converter between a first state and a second state,
the first state comprising, when a load power level is less than the threshold level, concurrently charging said battery module using the power limited DC charging signal and delivering the grid AC signal to said plurality of loads,
the second state comprising, when the load power level is greater than the threshold level, concurrently converting the DC power signal with said bidirectional AC-DC converter into a battery AC signal for delivery to said plurality of loads, and delivering the grid AC signal to said plurality of loads.
11. The mobile vehicle platform of claim 10 wherein said controller is configured to selectively switch said bidirectional AC-DC converter between a third state, and a fourth state; wherein the third state comprises, when said battery module is fully charged, and when the load power level is less than the threshold level, delivering the grid AC signal to said plurality of loads and placing said bidirectional AC-DC converter in a stand-by state; and wherein the fourth state comprises when the power limited DC charging signal is unavailable, converting the DC power signal with said bidirectional AC-DC converter into the battery AC signal for delivery to said plurality of loads.
12. The mobile vehicle platform of claim 10 wherein said mobile power system further comprises first and second switching circuits coupled between said battery module and said bidirectional AC-DC converter, each of said first switching circuit and said second switching circuit comprising a first switch, and a diode pair coupled in parallel to said first switch.
13. The mobile vehicle platform of claim 12 wherein said diode pair comprises a pair of Zener diodes each having respective cathode terminals coupled together.
14. The mobile vehicle platform of claim 12 wherein each of said first switching circuit and said second switching circuit comprises a second switch and a resistor coupled in series; and wherein said second switch and said resistor being coupled in parallel to said first switch.
15. The mobile vehicle platform of claim 14 wherein each of said first switching circuit and said second switching circuit comprises a current limiting element coupled between said battery module and said first switch.
16. The mobile vehicle platform of claim 10 wherein said mobile power system further comprises an AC distribution circuit coupled to said bidirectional AC-DC converter and configured to deliver a plurality of AC signals respectively to said plurality of loads.
17. The mobile vehicle platform of claim 10 wherein said controller comprises a battery management device configured to monitor a plurality of parameters related to said battery module.
18. A method for making a mobile power system, the method comprising:
coupling a bidirectional alternating current-direct current (AC-DC) converter configured to convert a grid AC signal to a power limited DC charging signal with a threshold level;
coupling a battery module configured to provide a DC power signal;
coupling a controller to the battery module and the bidirectional AC-DC converter and configured to selectively switch the bidirectional AC-DC converter between a first state and a second state; and
coupling at least one switching circuit between the battery module and the bidirectional AC-DC converter, the at least one switching circuit comprising
a first switch, and
a diode pair coupled in parallel to the first switch, each diode of the diode pair having respective cathode terminals coupled together;
the first state comprising, when a load power level is less than the threshold level, concurrently charging the battery module using the power limited DC charging signal and delivering the grid AC signal to a load;
the second state comprising, when the load power level is greater than the threshold level, concurrently converting the DC power signal with the bidirectional AC-DC converter into a battery AC signal for delivery to the load, and delivering the grid AC signal to the load.
19. The method of claim 18 wherein the controller is configured to selectively switch the bidirectional AC-DC converter between a third state, and a fourth state; wherein the third state comprises, when the battery module is fully charged, and when the load power level is less than the threshold level, delivering the grid AC signal to the load and placing the bidirectional AC-DC converter in a stand-by state; and wherein the fourth state comprises when the power limited DC charging signal is unavailable, converting the DC power signal with the bidirectional AC-DC converter into the battery AC signal for delivery to the load.
20. The method of claim 18 wherein the at least one switching circuit comprises first and second switching circuits between the battery module and the bidirectional AC-DC converter, each of the first switching circuit and the second switching circuit comprising a first switch, and a diode pair coupled in parallel to the first switch.
21. A mobile power system comprising:
a bidirectional alternating current-direct current (AC-DC) converter configured to convert a grid AC signal to a power limited DC charging signal with a threshold level;
a battery module configured to provide a DC power signal;
a controller coupled to said battery module and said bidirectional AC-DC converter and configured to selectively switch said bidirectional AC-DC converter between a first state and a second state; and
at least one switching circuit coupled between said battery module and said bidirectional AC-DC converter and comprising
a first switch,
a diode pair coupled in parallel to said first switch, and
a second switch and a resistor coupled in series, said second switch and said resistor being coupled in parallel to said first switch;
the first state comprising, when a load power level is less than the threshold level, concurrently charging said battery module using the power limited DC charging signal and delivering the grid AC signal to a load;
the second state comprising, when the load power level is greater than the threshold level, concurrently converting the DC power signal with said bidirectional AC-DC converter into a battery AC signal for delivery to the load, and delivering the grid AC signal to the load.
22. A method for making a mobile power system, the method comprising:
coupling a bidirectional alternating current-direct current (AC-DC) converter configured to convert a grid AC signal to a power limited DC charging signal with a threshold level;
coupling a battery module configured to provide a DC power signal;
coupling a controller to the battery module and the bidirectional AC-DC converter and configured to selectively switch the bidirectional AC-DC converter between a first state and a second state; and
coupling at least one switching circuit between the battery module and the bidirectional AC-DC converter, the at least one switching circuit comprising
a first switch,
a diode pair coupled in parallel to the first switch, and
a second switch and a resistor coupled in series, the second switch and the resistor being coupled in parallel to the first switch;
the first state comprising, when a load power level is less than the threshold level, concurrently charging the battery module using the power limited DC charging signal and delivering the grid AC signal to a load;
the second state comprising, when the load power level is greater than the threshold level, concurrently converting the DC power signal with the bidirectional AC-DC converter into a battery AC signal for delivery to the load, and delivering the grid AC signal to the load.