Charging device and on board power supply device
View Patent ↗A charging device includes an AC/DC converter, a first DC/DC converter, a second DC/DC converter, and an inductance element. The AC/DC converter is connected to an external power source and configured to convert AC power into DC power. The first DC/DC converter is configured to convert a voltage the DC power outputted from the AC/DC converter and supply the resultant DC power to a first battery. The second DC/DC converter is connected in parallel to the first battery on the output side of the first DC/DC converter, and configured to convert a voltage of the DC power outputted from the first DC/DC converter and supply the resultant DC power to a second battery. The inductance element is provided between the first DC/DC converter and the second DC/DC converter, and connected in series to the first DC/DC converter and the second DC/DC converter.
1. A charging device configured to charge a first battery using alternating current (AC) power supplied from an external power source, and capable of charging a second battery using the AC power, the first battery and the second battery having different charge voltages, the charging device comprising:
an AC/DC converter connected to the external power source, the AC/DC converter being configured to convert the AC power into first direct current (DC) power;
a first DC/DC converter including an output capacitor, the first DC/DC converter being configured to convert a voltage of the first DC power outputted from the AC/DC converter to generate second DC power and supply the second DC power to the first battery;
a second DC/DC converter including an input capacitor, the second DC/DC converter being connected in parallel to the first battery on an output side of the first DC/DC converter, the second DC/DC converter being configured to convert a voltage of the second DC power outputted from the first DC/DC converter to generate third DC power and supply the third DC power to the second battery; and
an inductance element provided between the output capacitor of the first DC/DC converter and the input capacitor of the second DC/DC converter and connected in series to the first DC/DC converter and the second DC/DC converter,
wherein the inductance element is disposed between the first battery and the second battery.
2. The charging device according to claim 1 ,
wherein the first DC/DC converter further includes a first switching driver and the second DC/DC converter further includes a second switching driver.
3. The charging device according to claim 2 ,
wherein the first DC/DC converter further includes a transformer,
in the first DC/DC converter, the output capacitor is closer to the second DC/DC converter than the transformer is, and
in the second DC/DC converter, the input capacitor is closer to the first DC/DC converter than the second switching driver.
4. The charging device according to claim 3 ,
wherein the first DC/DC converter includes an LLC resonant converter circuit.
5. The charging device according to claim 4 ,
wherein the AC/DC converter, the first DC/DC converter, the second DC/DC converter, and the inductance element are integrally housed in an identical casing.
6. The charging device according to claim 5 ,
wherein the output side of the first DC/DC converter is connected to an input side of the second DC/DC converter only via the inductance element.
7. The charging device according to claim 3 ,
wherein the AC/DC converter, the first DC/DC converter, the second DC/DC converter, and the inductance element are integrally housed in an identical casing.
8. The charging device according to claim 7 ,
wherein the output side of the first DC/DC converter is connected to an input side of the second DC/DC converter only via the inductance element.
9. The charging device according to claim 3 ,
wherein the output side of the first DC/DC converter is connected to an input side of the second DC/DC converter only via the inductance element.
10. The charging device according to claim 1 ,
wherein the second DC power is higher in voltage than the third DC power.
11. The charging device according to claim 1 ,
wherein the first DC/DC converter includes an LLC resonant converter circuit.
12. The charging device according to claim 11 ,
wherein the AC/DC converter, the first DC/DC converter, the second DC/DC converter, and the inductance element are integrally housed in an identical casing.
13. The charging device according to claim 12 ,
wherein the output side of the first DC/DC converter is connected to an input side of the second DC/DC converter only via the inductance element.
14. The charging device according to claim 11 ,
wherein the output side of the first DC/DC converter is connected to an input side of the second DC/DC converter only via the inductance element.
15. The charging device according to claim 1 ,
wherein the second DC/DC converter includes a step-down chopper circuit.
16. The charging device according to claim 1 ,
wherein the AC/DC converter, the first DC/DC converter, the second DC/DC converter, and the inductance element are integrally housed in an identical casing.
17. The charging device according to claim 16 ,
wherein the output side of the first DC/DC converter is connected to an input side of the second DC/DC converter only via the inductance element.
18. The charging device according to claim 1 ,
wherein the output side of the first DC/DC converter is connected to an input side of the second DC/DC converter only via the inductance element.
19. An on board power supply device, comprising:
a charging device according configured to charge a first battery using alternating current (AC) power supplied from an external power source, and capable of charging a second battery using the AC power, the first battery and the second battery having different charge voltages, the charging device including:
an AC/DC converter connected to the external power source, the AC/DC converter being configured to convert the AC power into first direct current (DC) power;
a first DC/DC converter including an output capacitor, the first DC/DC converter being configured to convert a voltage of the first DC power outputted from the AC/DC converter to generate second DC power and supply the second DC power to the first battery;
a second DC/DC converter including an input capacitor, the second DC/DC converter being connected in parallel to the first battery on an output side of the first DC/DC converter, the second DC/DC converter being configured to convert a voltage of the second DC power outputted from the first DC/DC converter to generate third DC power and supply the third DC power to the second battery; and
an inductance element provided between the output capacitor of the first DC/DC converter and the input capacitor of the second DC/DC converter and connected in series to the first DC/DC converter and the second DC/DC converter,
wherein the inductance element is disposed between the first battery and the second battery,
wherein the first battery is connected to the first DC/DC converter on the output side of the first DC/DC converter; and
wherein the second battery is connected to the second DC/DC converter on an output side of the second DC/DC converter.