Troubleshooting method and apparatus for power supply device

1. A troubleshooting method for a power supply device, wherein the troubleshooting method is applicable to an inverter power supply system in the power supply device, the inverter power supply system comprising at least two direct current to direct current (DC/DC) power supply modules, the at least two DC/DC power supply modules connected in parallel to a same battery and supplying power to a load by using a direct current to alternating current (DC/AC) power supply module, and any DC/DC power supply module of the at least two DC/DC power supply modules comprising fuses F 1 and F 2 , relays K 1 and K 2 , inductors L 1 and L 2 , switch modules Q 1 , Q 2 , and Q 3 , and direct current bus capacitors C 1 and C 2 ;

one terminal of the K 1 is connected to a positive terminal of the battery by using the F 1 , one terminal of the K 2 is connected to a negative terminal of the battery by using the F 2 , the other terminal of the K 1 is connected to connection terminals of the Q 1 and the Q 2 by using the L 1 , the other terminal of the K 2 is connected to connection terminals of the Q 2 and the Q 3 by using the L 2 , one terminal of the Q 1 is connected to one terminal of the C 1 , the other terminal of the Q 1 is connected to one terminal of the Q 2 , the other terminal of the Q 2 is connected to one terminal of the Q 3 , the other terminal of the C 1 is connected to the other terminal of the Q 3 by using the C 2 , the troubleshooting method comprising:

if any DC/DC power supply module of the at least two DC/DC power supply modules is detected as faulty, determining a faulty component in a faulty module, wherein the faulty module is said any DC/DC power supply module of the at least two DC/DC power supply modules that is faulty; and

if the faulty component is a C 1 or a C 2 , and the inverter power supply system is in a battery discharging mode, turning on a Q 2 in the faulty module, so that an F 1 and an F 2 of the faulty module are blown, thereby disconnecting the faulty module from another DC/DC power supply module of the at least two DC/DC power supply modules.

2. The troubleshooting method according to claim 1 , wherein the troubleshooting method further comprises:

if a short circuit component is the C 1 or the C 2 , and the inverter power supply system is in a battery charging mode, turning off a Q 1 and a Q 3 of the faulty module, and turning on the Q 2 of the faulty module after a preset time interval, so that the F 1 and the F 2 of the faulty module are blown, thereby disconnecting the faulty module from the another DC/DC power supply module.

3. The troubleshooting method according to claim 1 , wherein the determining a faulty component in the faulty module if the any DC/DC power supply module of the at least two DC/DC power supply modules is detected as faulty further comprises:

when the Q 2 and a Q 1 of the faulty module are in an off state, turning on a Q 3 of the faulty module and detecting a current state of an L 1 and an L 2 of the faulty module, and if it is detected that there is a current flowing in both the L 1 and the L 2 of the faulty module, determining that the Q 1 of the faulty module is short-circuited; or

when the Q 2 and the Q 3 of the faulty module are an off state, turning on the Q 1 of the faulty module and detecting a current state of the L 1 and the L 2 of the faulty module, and if it is detected that there is a current both in the L 1 and the L 2 of the faulty module, determining that the Q 3 of the faulty module is short-circuited.

4. The troubleshooting method according to claim 3 , wherein the troubleshooting method further comprises:

if a short circuit component in the faulty module is the Q 1 or the Q 3 , turning on the Q 2 of the faulty module, so that the F 1 and the F 2 of the faulty module are blown, thereby disconnecting the faulty module from the another DC/DC power supply module.

5. The troubleshooting method according to claim 3 , wherein the troubleshooting method further comprises:

if a short circuit component in the faulty module is the Q 1 or the Q 3 , turning off any one or more of a K 1 , a K 2 , the Q 1 , the Q 2 , or the Q 3 of the faulty module, thereby disconnecting a parallel connection between the faulty module and the another DC/DC power supply module.

6. A power supply device, wherein the power supply device comprises an inverter power supply system, the inverter power supply system comprising at least two direct current to direct current (DC/DC) power supply modules, the at least two DC/DC power supply modules connected in parallel to a same battery and supplying power to a load by using a direct current to alternating current (DC/AC) power supply module, and any DC/DC power supply module of the at least two DC/DC power supply modules comprising fuses F 1 and F 2 , relays K 1 and K 2 , inductors L 1 and L 2 , switch modules Q 1 , Q 2 , and Q 3 , and direct current bus capacitors C 1 and C 2 ;

one terminal of the K 1 is connected to a positive terminal of a battery by using the F 1 , one terminal of the K 2 is connected to a negative terminal of the battery by using the F 2 , the other terminal of the K 1 is connected to connection terminals of the Q 1 and the Q 2 by using the L 1 , the other terminal of the K 2 is connected to connection terminals of the Q 2 and the Q 3 by using the L 2 , one terminal of the Q 1 is connected to one terminal of the C 1 , the other terminal of the Q 1 is connected to one terminal of the Q 2 , the other terminal of the Q 2 is connected to one terminal of the Q 3 , the other terminal of the C 1 is connected to the other terminal of the Q 3 by using the C 2 , and any DC/DC power supply module of the at least two DC/DC power supply modules of the power supply device comprises:

a detection unit configured to detect a voltage signal and/or a current signal in any DC/DC power supply module of the at least two DC/DC power supply modules, and determine, based on the detected voltage signal and/or the detected current signal, whether the any DC/DC power supply module of the at least two DC/DC power supply modules is a faulty module; wherein, the detection unit is further configured to, when detecting that any DC/DC power supply module of the at least two DC/DC power supply modules is faulty, detect a faulty component in the faulty module; and

a control unit configured to, when the detection unit detects that the faulty component in the faulty module is a C 1 or a C 2 , and the inverter power supply system is in a battery discharging mode, turn on a Q 2 of the faulty module, wherein an F 1 and an F 2 of the faulty module are blown, thereby disconnecting the faulty module from another DC/DC power supply module.

7. The power supply device according to claim 6 , wherein the control unit is further configured to:

when the detection unit detects that the faulty component in the faulty module is the C 1 or the C 2 , and the inverter power supply system is in a battery charging mode, turn off a Q 1 and a Q 3 of the faulty module, and turn on the Q 2 of the faulty module after a preset time interval, so that the F 1 and the F 2 of the faulty module are blown, thereby disconnecting the faulty module from the another DC/DC power supply module.

8. The power supply device according to claim 6 , wherein the detection unit is further configured to:

when the Q 2 and a Q 1 of the faulty module are in an off state, turn on a Q 3 of the faulty module and detecting a current state of an L 1 and an L 2 of the faulty module, and if it is detected that there is a current flowing in both the L 1 and the L 2 of the faulty module, determine that the Q 1 of the faulty module is short-circuited; or

when the Q 2 and the Q 3 of the faulty module are in an off state, turn on the Q 1 of the faulty module and detecting a current state of the L 1 and the L 2 of the faulty module, and if it is detected that there is a current flowing in both the L 1 and the L 2 of the faulty module, determine that the Q 3 of the faulty module is short-circuited.

9. The power supply device according to claim 8 , wherein the control unit is further configured to:

when the detection unit detects that a short circuit component in the faulty module is the Q 1 or the Q 3 , turn on the Q 2 of the faulty module, so that the F 1 and the F 2 of the faulty module are blown, thereby disconnecting the faulty module from the another DC/DC power supply module.

10. The power supply device according to claim 8 , wherein the control unit is further configured to:

when the detection unit detects that the short circuit component in the faulty module is the Q 1 or the Q 3 , turn off any one or more of a K 1 , a K 2 , the Q 1 , the Q 2 , or the Q 3 of the faulty module, thereby disconnecting a parallel connection between the faulty module and the another DC/DC power supply module.