TECHNICAL FIELD

Embodiments of the invention relate to the field of electronic technologies, and in particular, to a troubleshooting method and apparatus for a power supply device.

BACKGROUND

An inverter power supply system is widely applied to various devices having high requirements for power supply reliability, and is configured to supply power to loads having high requirements for power supply stability. For example, in the communications field, an inverter power supply system such as an inverter or an uninterruptible power supply system (UPS) is usually used to supply power to key loads having high requirements for power supply stability.

In the prior art, as a capacity of an inverter power supply system is increasing, more power supply modules in the inverter power supply system are connected in parallel. A plurality of direct current/direct current conversion functional circuits (or referred to as a direct current/direct current power supply, DC/DC) are often connected in parallel. In a scenario in which the plurality of power supply modules are connected in parallel in the inverter power supply system, if one of the plurality of power supply modules is faulty when the inverter power supply system is running, there is a fault circuit in the plurality of power supply modules, and therefore other normal modules cannot work normally. A power output of the inverter power supply system is interrupted, and this affects normal operating of the key loads. Therefore, power supply stability of a device is low, and power supply reliability is poor.

SUMMARY

Embodiments of the application provide a troubleshooting method and apparatus for a power supply device, to improve stability and power supply reliability of a DC/DC circuit, and to improve applicability of an inverter power supply system.

A first aspect provides a troubleshooting method for a power supply device, where the troubleshooting method is applicable to an inverter power supply system in the power supply device. The inverter power supply system includes at least two direct current to direct current (DC/DC) power supply modules, the at least two DC/DC modules are connected in parallel to a same battery and supply power to a load by using a direct current to alternating current DC/AC power supply. Any one of the at least two DC/DC modules includes fuses F1and F2, relays K1and K2, inductors L1and L2, switch modules Q1, Q2, and Q3, and direct current bus capacitors C1and C2. One terminal of the K1is connected to a positive terminal of the battery by using the F1, one terminal of the K2is connected to a negative terminal of the battery by using the F2, the other terminal of the K1is connected to connection terminals of the Q1and the Q2by using the L1, the other terminal of the K2is connected to connection terminals of the Q2and the Q3by using the L2, one terminal of the Q1is connected to one terminal of the C1, the other terminal of the Q1is connected to one terminal of the Q2, the other terminal of the Q2is connected to one terminal of the Q3, the other terminal of the C1is connected to the other terminal of the Q3by using the C2. The troubleshooting method includes:

This troubleshooting method can detect a voltage signal and/or a battery signal of any one of the DC/DC modules, and determine whether a faulty module exists based on the detected voltage signal and/or battery signal. The voltage signal of the DC/DC module may include a battery voltage signal, a direct current bus voltage signal, and/or the like. The current signal of the DC/DC module may include a current signal of the inductor L1and/or the L2, and/or the like.

One terminal of the K1is connected to a positive terminal of the battery by using the F1, one terminal of the K2is connected to a negative terminal of the battery by using the F2, one terminal of the K1is connected to one terminal of the Q1and one terminal of the Q2by using the L1, one terminal of the K2is connected to one terminal of the Q2and one terminal of the Q3by using the L2, one terminal of the Q1is connected to one terminal of the C1, one terminal of the Q1is connected to one terminal of the Q2, one terminal of the Q2is connected to one terminal of the Q3, the other terminal of the C1is connected to one terminal of the Q3by using the C2. The troubleshooting method includes:

if it is detected that any one of the at least two DC/DC modules is faulty, determining a faulty component in the faulty module, where the faulty module is any one of the at least two DC/DC modules that is faulty; and

if the faulty component is a C1or a C2, and the inverter power supply system is in a battery discharging mode, turning on a Q2in the faulty module, so that an F1and an F2of the faulty module are blown, to disconnect the faulty module from another DC/DC module.

In this embodiment of the application, when it is detected that any one of the DC/DC modules is faulty, the faulty module may be isolated from the another DC/DC module, to ensure normal working of the another module that is different from the faulty module and that is connected in parallel, ensure a normal power supply state of the inverter power supply system, and improve power supply reliability of the inverter power supply system.

In one embodiment, the troubleshooting method further includes: if a short circuit component is the C1or the C2, and the inverter power supply system is in a battery charging mode, turning off a Q1and a Q3of the faulty module, and turning on the Q2of the faulty module after a preset time interval, so that the F1and the F2of the faulty module are blown, to disconnect the faulty module from the another DC/DC module. In this embodiment of the application, regardless of whether the inverter power supply system is in the battery discharging mode, the battery charging mode, or another working state, when it is detected that any one of the DC/DC modules is faulty, the faulty module may be isolated from the another DC/DC module, to ensure normal working of the another module that is different from the faulty module and that is connected in parallel, further ensure power supply stability of the inverter power supply system, improve power supply reliability of the inverter power supply system, and enhance applicability.

In one embodiment, after detecting the faulty module and when the Q2and the Q1of the faulty module are in an off state, the inverter power supply system may further turn on the Q3of the faulty module and detect current states of an L1and an L2of the faulty module. The detecting current states of an L1and an L2may include detecting whether there is a current in the L1or the L2. If it is detected that there is a current both in the L1and the L2of the faulty module, the inverter power supply system determines that the Q1of the faulty module is short-circuited. When the Q3is working, the inverter power supply system detects that there is a current both in the L1and the L2of the faulty module, and there is a current only in an L2of a normal module (for example, the another DC/DC module) (in this case, a Q3of the another DC/DC module is in an on state, and a Q1and a Q2are both in an off state, and therefore there is no current in an L1of the another DC/DC module). Therefore, if detecting that there is a current both in an L1and an L2of a DC/DC power converter1, the inverter power supply system may determine that the Q1of the faulty module is short-circuited. It is convenient to detect the faulty component in the faulty module, and therefore detection efficiency is higher.

In one embodiment, after detecting the faulty module and when the Q2and the Q3of the faulty module are in an off state, the inverter power supply system may further turn on the Q1of the faulty module and detect the current states of the L1and the L2of the faulty module. If detecting that there is a current both in the L1and the L2of the faulty module, the inverter power supply system may determine that the Q3of the faulty module is short-circuited. When a Q1is working, if a DC/DC module is faulty (for example, a Q3of the DC/DC module is short-circuited), there is a current both in an L1and an L2of the DC/DC module. In this case, there is a current only in an L1of a normal module (namely, another DC/DC module) (in this case, a Q1of another DC/DC module2is in an on state, a Q2and a Q3are both in an off state, and therefore there is no current in an L2of the another DC/DC module). Therefore, if the inverter power supply system detects that there is a current both in the L1and the L2of the faulty module, the Q3of the faulty module is faulty. This provides diversified manners of detecting the faulty component in the faulty module, enhances convenience of detecting the faulty component in the faulty module, and improves efficiency of detecting the faulty component.

In one embodiment, the troubleshooting method further includes: when a short circuit component in the faulty module is the Q1or the Q3, turning on the Q2of the faulty module, so that the F1and the F2of the faulty module are blown, to disconnect the faulty module from the another DC/DC module. Isolation of the faulty module ensures normal working of the another module in the inverter power supply system, ensures normal power supply of the inverter power supply system, improves power supply reliability of the inverter power supply system, and enhances applicability.

In one embodiment, the troubleshooting method further includes: when a short circuit component in the faulty module is the Q1or the Q3, turning off any one or more of a K1, a K2, the Q1, the Q2, or the Q3of the faulty module, to disconnect a connection between the faulty module and a battery, and disconnect a parallel connection between the faulty module and the another DC/DC module. This leads to a simpler operation, adds a manner of isolating the faulty module, and enhances flexibility of the operation.

A second aspect provides a power supply device, where the power supply device includes an inverter power supply system. The inverter power supply system includes at least two DC/DC modules, the at least two DC/DC modules are connected in parallel to a same battery and supply power to a load by using a direct current to alternating current DC/AC power supply. Any one of the at least two DC/DC modules includes fuses F1and F2, relays K1and K2, inductors L1and L2, switch modules Q1, Q2, and Q3, and direct current bus capacitors C1and C2. One terminal of the K1is connected to a positive terminal of the battery by using the F1, one terminal of the K2is connected to a negative terminal of the battery by using the F2, one terminal of the K1is connected to one terminal of the Q1and one terminal of the Q2by using the L1, one terminal of the K2is connected to one terminal of the Q2and one terminal of the Q3by using the L2, one terminal of the Q1is connected to one terminal of the C1, one terminal of the Q1is connected to one terminal of the Q2, one terminal of the Q2is connected to one terminal of the Q3, and the other terminal of the C1is connected to one terminal of the Q3by using the C2.

The any one of the at least two DC/DC modules includes: a detecting unit and a control unit. The detection unit is configured to detect a voltage signal and/or a current signal in the any one of the DC/DC modules, and determine, based on the detected voltage signal and/or the detected current signal, whether the any one of the DC/DC modules is faulty. The detection unit is further configured to, when detecting that the any one of the DC/DC modules is faulty, detect a faulty component in the faulty module. The control unit is configured to, when the detection unit detects that the faulty component in the faulty module is a C1or a C2, and the inverter power supply system is in a battery discharging mode, turn on a Q2of the faulty module, where an F1and an F2of the faulty module are blown, to disconnect the faulty module from another DC/DC module.

In one embodiment, the control unit is further configured to: when the detection unit detects that the faulty component in the faulty module is the C1or the C2, and the inverter power supply system is in a battery charging mode, turn off a Q1and a Q3of the faulty module, and turn on the Q2of the faulty module after a preset time interval, so that the F1and the F2of the faulty module are blown, to disconnect the faulty module from the another DC/DC module.

In one embodiment, the detection unit is further configured to: when the Q2and the Q1of the faulty module are in an off state, turn on the Q3of the faulty module and detect a current state of the L1and the L2of the faulty module, and if it is detected that there is a current both in the L1and the L2of the faulty module, determine that the Q1of the faulty module is short-circuited; or when the Q2and the Q3of the faulty module are in an off state, turn on the Q1of the faulty module and detect a current state of the L1and the L2of the faulty module, and if it is detected that there is a current both in the L1and the L2of the faulty module, determine that the Q3of the faulty module is short-circuited.

In one embodiment, the control unit is further configured to: when the detection unit detects that the short circuit component in the faulty module is the Q1or the Q3, turn on the Q2of the faulty module, so that the F1and the F2of the faulty module are blown, to disconnect the faulty module from the another DC/DC module.

In one embodiment, the control unit is further configured to: when the detection unit detects that the short circuit component in the faulty module is the Q1or the Q3, turn off any one or more of a K1, a K2, the Q1, the Q2, or the Q3of the faulty module, to disconnect a parallel connection between the faulty module and the another DC/DC module.

In this embodiment of the application, the inverter power supply system may detect a fault in each DC/DC module by using the detection unit or another logical control module built in each DC/DC module. After detecting the faulty module, the inverter power supply system controls the on or off state of the switch module, for example, the Q1, the Q2, or the Q3, by using the control unit (or referred to as a drive unit), to isolate the faulty module. This ensures normal working of the another DC/DC module in the inverter power supply system, ensures normal power supply of the inverter power supply system, improves power supply reliability of the inverter power supply system, and enhances applicability.

