High power flash battery system and method thereof
View Patent ↗A high power flash battery system includes a wayside flash battery and a half-bridge cell. The half-bridge cell has a voltage polarity opposite to that of the wayside flash battery. The half-bridge cell is configured to be in a voltage compensation mode when the system is unloaded, and to be switched to a bypass mode when a voltage drop occurs due to the system being loaded. A high power charging station, an onboard battery operated device, as well as a method for flash charging are also presented.
1. A high power flash battery system for flash charging of an onboard battery, comprising:
a wayside flash battery; and
a half-bridge cell comprising:
a first switch and a second switch configured to work in complementary mode to provide a voltage compensation mode and a bypass mode, respectively; and
a capacitor, a supercapacitor, or a battery, connected in series between the wayside flash battery through the first switch and a load,
wherein the half-bridge cell has a voltage polarity opposite to that of the wayside flash battery,
wherein the half-bridge cell is configured to be in the voltage compensation mode when the system is unloaded, and to be switched to the bypass mode when a voltage drop occurs due to the system being loaded.
2. The system according to claim 1 , wherein the half-bridge cell comprises a low power discharge circuit configured to prevent capacitor voltage drift during repeated operation.
3. The system according to claim 1 , wherein the load is a DC-DC converter.
4. The system according to claim 1 , wherein the load is a DC-AC converter.
5. A high power charging station for flash charging of an onboard battery, comprising:
a wayside flash battery; and
a half-bridge cell comprising:
two switches a first switch and a second switch configured to work in complementary mode to provide a voltage compensation mode and a bypass mode, respectively; and
a capacitor, a supercapacitor, or a battery, connected in series between the wayside flash battery through the first switch and a load,
wherein the half-bridge cell is connected in series with the wayside flash battery, and has a voltage polarity opposite to that of the wayside flash battery,
wherein the half-bridge cell is configured to be in a voltage decrease mode when the station is unloaded, and to be switched to the bypass mode when a voltage drop occurs due to the system being loaded.
6. The system according to claim 5 , wherein the half-bridge cell comprises a low power discharge circuit configured to prevent capacitor voltage drift during repeated operation.
7. The system according to claim 5 , wherein the load is a DC-DC converter.
8. The system according to claim 5 , wherein the load is a DC-AC converter.
9. An onboard battery operated device for flash charging of an onboard battery, comprising:
an onboard battery; and
a half-bridge cell comprising:
a first switch and a second switch configured to work in complementary mode to provide a voltage compensation mode and a bypass mode, respectively; and
a capacitor, a supercapacitor, or a battery, connected in series between the wayside flash battery through the first switch and a load,
wherein the half-bridge cell is connected in series with the onboard battery, and has a voltage polarity equal to that of the onboard battery,
wherein the half-bridge cell is configured to be in an increase mode when the device is not charged, and to be switched to the bypass mode when a voltage drop occurs due to the device being charged.
10. The system according to claim 9 , wherein the half-bridge cell comprises a low power discharge circuit configured to prevent capacitor voltage drift during repeated operation.
11. The system according to claim 9 , wherein the load is a DC-DC converter.
12. The system according to claim 9 , wherein the load is a DC-AC converter.
13. A method for flash charging of an onboard battery from a high power, wayside flash battery, comprising:
initiate charging of the onboard battery through a half-bridge cell comprising:
a first switch and a second switch configured to work in complementary mode to provide a voltage compensation mode and a bypass mode, respectively; and
a capacitor, a supercapacitor, or a battery, connected in series between the wayside flash battery through the first switch and a load,
wherein the half-bridge cell has a voltage polarity opposite of that of the high power, wayside flash battery; and
continue charging of the onboard battery with the half-bridge cell bypassed, wherein the half-bridge cell is bypassed when a voltage drop occurs after the initial charging.
14. The method according to claim 13 , comprising:
stop charging of the onboard battery when a charging voltage of the high power, wayside flash battery drops below a minimum voltage of DC-DC converter connected between the half-bridge cell and the onboard battery.
15. The method according to claim 13 , wherein the half-bridge cell comprises a low power discharge circuit configured to prevent capacitor voltage drift during repeated operation.
16. The method according to claim 13 , wherein the load is a DC-DC converter.
17. The method according to claim 13 , wherein the load is a DC-AC converter.