Dual power supply switching device, power supply system, electrical equipment and vehicle

Abstract

The utility model discloses a dual power supply switching device, a power supply system, electrical equipment and a vehicle, the dual power supply switching device comprises a first relay, the input end of the first relay is connected with a first power supply and a second power supply, and the output end of the first relay is suitable for outputting an AC electric signal of the first power supply or the second power supply; the first relay is used for communicating with a first power supply in a normal state and communicating with a second power supply when the first power supply fails; the input end of the second relay is connected with the first power source and the second power source, the output end of the second relay is suitable for outputting alternating current signals of the first power source or the second power source, and the second relay is used for being communicated with the second power source in the normal state and communicated with the first power source when the second power source breaks down. By adopting the device, the problems of contact arcing and sintering caused by contact overload can be avoided, and meanwhile, the problem of instantaneous power failure of the load caused by power supply switching can also be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a dual power switching device, a power system, electrical equipment and a vehicle. Background Art

[0002] In the related art, the load switching of two power supplies is achieved through physical switching of an automatic transfer switch (ATS). However, the number of switching times and switching capacity of the automatic transfer switch are based on the breaking capacity of the switching contacts. Moreover, when switching, the contacts of the ATS bear the entire load, which may cause contact arcing and sintering due to contact overload. In addition, the ATS switching is a physical switching, which may cause the load to be instantly powered off due to the power switching. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a dual power switching device, which can avoid the problem of contact arcing and sintering due to contact overload, and also avoid the problem of load instantaneous power failure due to power switching.

[0004] A second objective of the present invention is to provide a power supply system.

[0005] The third purpose of the utility model is to provide an electrical device.

[0006] A fourth object of the present invention is to provide a vehicle.

[0007] In order to solve the above problems, the first aspect of the utility model provides a dual power switching device for a power supply system, wherein the power supply system includes a first power supply and a second power supply, and the dual power switching device includes: a first relay, wherein the input end of the first relay is connected to the first power supply and the second power supply, and the output end of the first relay is suitable for outputting the AC signal of the first power supply or the second power supply, and the first relay is used to connect with the first power supply in a normal state, and to connect with the second power supply when the first power supply fails; a second relay, wherein the input end of the second relay is connected to the first power supply and the second power supply, and the output end of the second relay is suitable for outputting the AC signal of the first power supply or the second power supply, and the second relay is used to connect with the second power supply in a normal state, and to connect with the first power supply when the second power supply fails.

[0008] According to the dual power switching device of the utility model, when the first power supply fails and the second power supply is normal, the first relay and the second relay are connected to the second power supply, and the second power supply can output an AC signal through the first relay and the second relay to supply power to the load. When the first power supply is normal and the second power supply fails, the first relay and the second relay are connected to the first power supply, and the first power supply can output an AC signal through the first relay and the second relay to supply power to the load. Thus, when the first power supply or the second power supply supplies power to the load, the contacts of the first relay and the second relay share the load, and the first relay and the second relay are not hot-switched, thereby avoiding the problem of contact arcing and sintering due to contact overload. In addition, since the first power supply and the second power supply both supply power to the load when they are normal, when any power supply failure is detected, only the connection between the power supply and the corresponding relay is cut off, and the other power supply always supplies power to the load, thereby avoiding the problem of instantaneous power failure of the load due to power switching.

[0009] In some embodiments, the first relay includes a first contact, a second contact, a third contact, a fourth contact, a first switch and a second switch, the first contact is connected to the live wire of the second power supply, the second contact is connected to the live wire of the first power supply, the third contact is connected to the neutral wire of the second power supply, and the fourth contact is connected to the neutral wire of the first power supply; wherein, in a normal state, the first relay is energized, the first switch is connected to the second contact and the second switch is connected to the fourth contact, and when the first power supply fails, the first relay is de-energized, the first switch is connected to the first contact and the second switch is connected to the third contact.

[0010] In some embodiments, the second relay includes a fifth contact, a sixth contact, a seventh contact, an eighth contact, a third switch and a fourth switch, the fifth contact is connected to the live wire of the first power supply, the sixth contact is connected to the live wire of the second power supply, the seventh contact is connected to the neutral wire of the first power supply, and the eighth contact is connected to the neutral wire of the second power supply; wherein, in a normal state, the second relay is energized, the third switch is connected to the sixth contact and the fourth switch is connected to the eighth contact, and when the second power supply fails, the second relay is de-energized, the third switch is connected to the fifth contact and the fourth switch is connected to the seventh contact.

[0011] In some embodiments, the dual power switching device also includes: a rectifier unit, which is connected to the output end of the first relay and the output end of the second relay, and is used to convert the AC signal output by the first power supply and / or the second power supply into a DC signal; an inverter unit, which is connected to the rectifier unit, and is used to convert the DC signal into an AC signal for use by the load.

[0012] In some embodiments, the rectifier unit includes: a first rectifier bridge, a first end of the first rectifier bridge is connected to the first output end of the first relay, a second end of the first rectifier bridge is connected to the first input end of the inverter unit, a third end of the first rectifier bridge is connected to the second output end of the first relay, and a fourth end of the first rectifier bridge is connected to the second output end of the first relay; a second rectifier bridge, a first end of the second rectifier bridge is connected to the first output end of the second relay, a second end of the second rectifier bridge is connected to the first input end of the inverter unit, a third end of the second rectifier bridge is connected to the second output end of the second relay, and a fourth end of the second rectifier bridge is connected to the second output end of the first relay.

[0013] In some embodiments, the AC power signal for use by the load includes an L-phase power signal and an N-phase power signal, and the inverter unit includes: a first inverter, the input end of the first inverter is the first input end of the inverter unit, and the output end of the first inverter is used to convert the DC power signal into the L-phase power signal; a second inverter, the input end of the second inverter is the second input end of the inverter unit, and the output end of the second inverter is used to convert the DC power signal into the N-phase power signal.

[0014] In some embodiments, the first rectifier bridge or the second rectifier bridge includes: a first diode, the anode of the first diode is the first end of the first rectifier bridge or the first end of the second rectifier bridge, and the cathode of the first diode is the second end of the first rectifier bridge or the second end of the second rectifier bridge; a second diode, the cathode of the second diode is connected to the cathode of the first diode, and the anode of the second diode is the third end of the first rectifier bridge or the third end of the second rectifier bridge; a third diode, the cathode of the third diode is connected to the anode of the second diode, and the anode of the third diode is the fourth end of the first rectifier bridge or the fourth end of the second rectifier bridge; a fourth diode, the anode of the fourth diode is connected to the anode of the third diode, and the cathode of the fourth diode is connected to the anode of the first diode.

[0015] A second aspect of the present invention provides a power supply system, including: a first power supply and a second power supply; and the dual power supply switching device described in the above embodiment, wherein the dual power supply switching device is connected to the first power supply and the second power supply.

[0016] According to the power supply system of the utility model, the dual power supply switching device of the above embodiment can avoid the problem of contact arcing and sintering due to contact overload, and can also avoid the problem of instantaneous power failure of the load due to power switching.

[0017] A third aspect of the present invention provides an electrical device, comprising the power supply system described in the above embodiment.

[0018] According to the electrical equipment of the utility model, the power supply system of the above embodiment can avoid the problem of contact arcing and sintering due to contact overload, and can also avoid the problem of instantaneous power failure of load due to power switching.

[0019] A third aspect of the present invention provides a vehicle, comprising the power supply system described in the above embodiment.

[0020] According to the vehicle of the utility model, the power supply system of the above embodiment can avoid the problem of contact arcing and sintering due to contact overload, and can also avoid the problem of instantaneous power failure of the load due to power switching.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic diagram of a dual power switching device according to an embodiment of the utility model;

[0024] Figure 2 is a flow chart of a control process of a dual power switching device according to an embodiment of the utility model;

[0025] Figure 3 is a flow chart of a control process of a dual power switching device according to another embodiment of the utility model;

[0026] Figure 4 is a flow chart of a control process of a dual power switching device according to another embodiment of the utility model;

[0027] Figure 5is a structural block diagram of a power supply system according to an embodiment of the utility model;

[0028] Figure 6 is a structural block diagram of an electrical device according to an embodiment of the utility model;

[0029] Figure 7 It is a structural block diagram of a vehicle according to an embodiment of the utility model.

[0030] Reference numerals:

[0031] Vehicle 100; electrical equipment 30; power supply system 20; dual power supply switching device 10;

[0032] First relay QF1; second relay QF2; rectifier unit 1; inverter unit 2; first rectifier bridge DB1; second rectifier bridge DB2; first inverter U1; second inverter U2; first diode D1; second diode D2; third diode D3; fourth diode D4; first power supply 3; second power supply 4;

[0033] first contact A; second contact B; third contact C; fourth contact D; first switch K1; second switch K2; fifth contact E; sixth contact F; seventh contact G; eighth contact H; third switch K3; fourth switch K4. DETAILED DESCRIPTION

[0034] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0035] In the related art, when the first power supply or the second power supply fails and needs to be switched, the existing dual power switching device adopts an external UPS (Uninterrupted Power Supply) to solve the problem of instantaneous power outage of the load during power switching. That is to say, when the first power supply or the second power supply fails and needs to be switched, the UPS supplies power to the load to ensure that the load will not be instantly powered off due to power switching. However, this method requires additional power supply equipment, thereby increasing the production cost of the dual power switching device.

[0036] In order to solve the above problems, the first embodiment of the utility model provides a dual power switching device, which can avoid the problem of contact arcing and sintering due to contact overload, and also avoid the problem of instantaneous power failure of the load due to power switching.

[0037] In an embodiment, the dual power switching device is used in a power system, and the power system includes a first power supply and a second power supply. For example, the dual power switching device can be used in a computer room device, and the power distribution line inputs of the first power supply and the second power supply of the computer room device are two mains input by different transformers, and the dual power switching device is used to control the power supply of the computer room device.

[0038] Reference below Figure 1 The dual power switching device 10 according to the embodiment of the utility model is described as follows: Figure 1 As shown, the dual power switching device 10 includes: a first relay QF1 and a second relay QF2.

[0039] Among them, the input end of the first relay QF1 is connected to the first power supply and the second power supply, and the output end of the first relay QF1 is suitable for outputting the AC signal of the first power supply or the second power supply. The first relay QF1 is used to connect with the first power supply in a normal state, and connect with the second power supply when the first power supply fails; the input end of the second relay QF2 is connected to the first power supply and the second power supply, and the output end of the second relay QF2 is suitable for outputting the AC signal of the first power supply or the second power supply. The second relay QF2 is used to connect with the second power supply in a normal state, and connect with the first power supply when the second power supply fails.

[0040] Specifically, the dual power switching device has a first relay QF1 connected to the first power supply when the first power supply is in a normal state, and a second relay QF2 connected to the second power supply when the second power supply is in a normal state; when the first power supply fails and the second power supply is in a normal state, the first relay QF1 is connected to the second power supply, and the second power supply is connected to the second power supply in a normal state, that is, when the first power supply fails, the first relay QF1 and the second relay QF2 are both connected to the second power supply, so that the second power supply outputs an AC signal through the first relay QF1 and the second relay QF2 to supply power to the load; and when the second power supply fails, the second relay QF2 is connected to the first power supply, and the first power supply is also connected to the first relay QF1 in a normal state, that is, When the second power supply fails, the first relay QF1 and the second relay QF2 are both connected to the first power supply, so that the first power supply outputs an AC signal through the first relay QF1 and the second relay QF2 to supply power to the load. Therefore, compared with the prior art that realizes the on-load switching of two power supplies through ATS, the dual power supply switching device in the present application realizes power supply switching through the first relay QF1 and the second relay QF2, and when one of the power supplies fails, the first relay QF1 and the second relay QF2 are connected to the other power supply, so that when the first power supply or the second power supply supplies power to the load, the contacts of the first relay QF1 and the second relay QF2 share the load, and the first relay QF1 and the second relay QF2 are not hot switching, thereby avoiding the problem of contact arcing and sintering due to contact overload. In addition, since the first power supply and the second power supply both supply power to the load when they are normal, when any power supply failure is detected, only the connection between the power supply and the corresponding relay is cut off, and the other power supply always supplies power to the load, thereby avoiding the problem of instantaneous power failure of the load due to power supply switching, ensuring the normal operation of the load, and no additional power supply equipment is required, thereby reducing the production cost of the dual power supply switching device.

[0041] In the embodiment, in the related technology, the main power supply operation mode is adopted when the power grid is operating normally, so that the main power supply is always in a load state, and the backup power supply is always in an idle state, which is not conducive to the stability and economy of the power grid, and accelerates the aging of the main power supply. In order to solve this problem, the first power supply is used as the main power supply in this application, and the second power supply is used as the backup power supply. When the first power supply and the second power supply are in a normal state, that is, when the power grid is normal, the dual power supply switching device controls the first relay QF1 to be connected to the first power supply, and controls the second relay QF2 to be connected to the second power supply, so that the first power supply and the second power supply share the load, that is, the load is no longer borne by the main power supply alone, but by the main power supply and the backup power supply together, so that the main power supply and the dual power supply switching device are in a low-load operation state, effectively improving the stability of the power grid, reducing the later maintenance cost, and slowing down the aging speed of the main power supply.

[0042] According to the dual power switching device of the utility model, when the first power fails and the second power is normal, the first relay QF1 and the second relay QF2 are connected to the second power, and the second power can output an AC signal to supply power to the load through the first relay QF1 and the second relay QF2. When the first power is normal and the second power fails, the first relay QF1 and the second relay QF2 are connected to the first power, and the first power can output an AC signal to supply power to the load through the first relay QF1 and the second relay QF2. Thus, when the first power or the second power supplies power to the load, the contacts of the first relay QF1 and the second relay QF2 share the load, and the first relay QF1 and the second relay QF2 are not hot switching, thereby avoiding the problem of contact arcing and sintering due to contact overload. In addition, since the first power and the second power both supply power to the load when they are normal, when any power failure is detected, only the connection between the power supply and the corresponding relay is cut off, and the other power supply always supplies power to the load, thereby avoiding the problem of instantaneous power failure of the load due to power switching.

[0043] In some embodiments, Figure 1 As shown, the first relay QF1 includes a first contact A, a second contact B, a third contact C, a fourth contact D, a first switch K1 and a second switch K2.

[0044] The first contact A is connected to the live wire of the second power supply, the second contact B is connected to the live wire L1 of the first power supply, the third contact C is connected to the neutral wire N2 of the second power supply, and the fourth contact D is connected to the neutral wire N1 of the first power supply; in a normal state, the first relay QF1 is energized, the first switch K1 is connected to the second contact B, and the second switch K2 is connected to the fourth contact D, and when the first power supply fails, the first relay QF1 is de-energized, the first switch K1 is connected to the first contact A, and the second switch K2 is connected to the third contact C. The first switch K1 and the second switch K2 are double switches of the relay. The relay double switch means that a set of switches is closed in the normal state of the switch, and the existing switches are disconnected and another set of switches are closed after power is turned on.

[0045] Specifically, the dual power switching device controls the first relay QF1 to be energized when the first power supply is in a normal state, so as to control the first switch K1 of the first relay QF1 to be connected to the second contact B and the second switch K2 to be connected to the fourth contact D, so that the live wire L1 and the neutral wire N1 of the first power supply output an AC signal through the first relay QF1 to supply power to the load. When the first power supply fails, the first relay QF1 is controlled to be de-energized, so as to control the first switch K1 of the first relay QF1 to be connected to the first contact A and the second switch K2 to be connected to the third contact C, so that the live wire L2 and the neutral wire N2 of the second power supply output an AC signal through the first relay QF1 to supply power to the load.

[0046] In some embodiments, Figure 1 As shown, the second relay QF2 includes a fifth contact E, a sixth contact F, a seventh contact G, an eighth contact H, a third switch K3 and a fourth switch K4.

[0047] Among them, the fifth contact E is connected to the live wire L1 of the first power supply, the sixth contact F is connected to the live wire L2 of the second power supply, the seventh contact G is connected to the neutral wire N1 of the first power supply, and the eighth contact H is connected to the neutral wire N2 of the second power supply; wherein, in a normal state, the second relay QF2 is energized, the third switch K3 is connected to the sixth contact F and the fourth switch K4 is connected to the eighth contact H, and when the second power supply fails, the second relay QF2 is de-energized, the third switch K3 is connected to the fifth contact E and the fourth switch K4 is connected to the seventh contact G.

[0048] Specifically, when the second power supply is in a normal state, the dual power supply switching device controls the second relay QF2 to be energized, so as to control the third switch K3 of the second relay QF2 to be connected to the sixth contact F and the fourth switch K4 to be connected to the eighth contact H, so that the live wire L2 and the neutral wire N2 of the second power supply output an AC signal through the second relay QF2 to supply power to the load; when the second power supply fails, the second relay QF2 is controlled to be de-energized, so as to control the third switch K3 to be connected to the fifth contact E and the fourth switch K4 to be connected to the seventh contact G, so that the live wire L1 and the neutral wire N2 of the first power supply output an AC signal through the second relay QF2 to supply power to the load.

[0049] Exemplarily, when both the first power supply and the second power supply are normal, the dual power supply switching device controls the first relay QF1 to be energized when the first power supply is in a normal state, so as to control the first switch K1 of the first relay QF1 to be connected to the second contact B and the second switch K2 to be connected to the fourth contact D, so that the live wire L1 and the neutral wire of the first power supply output an AC signal through the first relay QF1 to supply power to the load, and at the same time, controls the second relay QF2 to be energized when the second power supply is in a normal state, so as to control the third switch K3 of the second relay QF2 to be connected to the sixth contact F and the fourth switch K4 to be connected to the eighth contact D. H is connected so that the live wire L2 and the neutral wire of the second power supply output an AC signal through the second relay QF2 to supply power to the load. Therefore, when the first power supply and the second power supply are in normal state, the first relay QF1 is controlled to be connected with the first power supply, and the second relay QF2 is controlled to be connected with the second power supply, so that the first power supply and the second power supply share the load, that is, the load is no longer borne by the first power supply alone, but is borne by the first power supply and the second power supply together, so that the main power supply is in a low-load operation state, which effectively improves the stability of the power grid, reduces the later maintenance cost, and slows down the aging speed of the main power supply.

[0050] Alternatively, when the first power supply fails and the second power supply is normal, the second power supply is connected to the first relay QF1 to cut off the connection between the first power supply and the first relay QF1, that is, when the first power supply fails, the first relay QF1 is controlled to be de-energized, so as to control the first switch K1 of the first relay QF1 to be connected to the first contact A and the second switch K2 to be connected to the third contact C, that is, the first switch K1 and the second switch K2 of the first relay QF1 are controlled to be restored to the input end of the second power supply, and the dual power supply switching device enters the load state of the second power supply, so that the live wire L2 and the neutral wire of the second power supply output an AC signal through the first relay QF1 to supply power to the load, and at the same time, in the first When the second power supply is in a normal state, the second relay QF2 is controlled to be energized, so as to control the third switch K3 of the second relay QF2 to be connected to the sixth contact F and the fourth switch K4 to be connected to the eighth contact H, so that the live wire L2 and the neutral wire of the second power supply output an AC signal through the second relay QF2 to supply power to the load. Thus, when the first power supply fails, the second power supply supplies power to the load through the first relay QF1 and the second relay QF2, so that the contacts of the first relay QF1 and the second relay QF2 share the load, and the first relay QF1 and the second relay QF2 are not hot-switched, thereby avoiding the problem of contact arcing and sintering due to contact overload. In addition, since the first power supply and the second power supply both supply power to the load when they are normal, therefore, when the first power supply fails, only the connection between the first power supply and the first relay QF1 is cut off, and the second power supply always supplies power to the load, thereby avoiding the problem of instantaneous power failure of the load due to power switching.

[0051] Alternatively, when the first power supply is normal and the second power supply fails, the first power supply is connected to the second relay QF2 to cut off the connection between the second power supply and the second relay QF2, that is, the third switch K3 is controlled to be connected to the fifth contact E and the fourth switch K4 is controlled to be connected to the seventh contact G, so that the live wire L1 and the neutral wire of the first power supply output an AC signal through the second relay QF2 to supply power to the load. At the same time, the first power supply controls the first relay QF1 to be energized in a normal state to control the first switch K1 of the first relay QF1 to be connected to the second contact B and the second switch K2 to be connected to the fourth contact D, so that the live wire L1 and the neutral wire of the first power supply output an AC signal through the first relay QF1 to supply power to the load. Therefore, when the second power supply fails, the first power supply supplies power to the load through the first relay QF1 and the second relay QF2, so that the contacts of the first relay QF1 and the second relay QF2 share the load, and the first relay QF1 and the second relay QF2 do not belong to hot switching, thereby avoiding the problem of contact arcing and sintering due to contact overload. In addition, since both the first power supply and the second power supply supply power to the load when they are normal, when a fault in the second power supply is detected, only the connection between the second power supply and the second relay QF2 is cut off, and the first power supply always supplies power to the load, thereby avoiding the problem of instantaneous power failure of the load due to power switching.

[0052] In some embodiments, Figure 1 As shown, the dual power switching device 10 further includes: a rectifying unit 1 and an inverter unit 2 .

[0053] Among them, the rectifier unit 1 is connected to the output end of the first relay QF1 and the output end of the second relay QF2, and the rectifier unit 1 is used to convert the AC signal output by the first power supply and / or the second power supply into a DC signal; the inverter unit 2 is connected to the rectifier unit 1, and the inverter unit 2 is used to convert the DC signal into an AC signal for use by the load, and the inverter unit 2 can change the amplitude, frequency and phase of the AC signal.

[0054] Specifically, at present, data rooms and important loads all use dual power supplies to achieve power backup. Due to the problems of different frequencies, different phases, different voltages, etc., the dual power supplies cannot be directly connected to the load equipment. In order to solve this problem, the dual power switching device in the present application converts the AC signal output by the first power supply and / or the second power supply into a DC signal through the rectifier unit 1. That is, the rectifier unit 1 converts the AC signal output by the first power supply and / or the second power supply into a DC signal, and then converts the DC signal into an AC signal for use by the load through the inverter unit 2, and the inverter unit 2 can change the amplitude, frequency and phase of the AC signal according to the load usage requirements, so that the AC signal output by the first power supply and the second power supply can supply power to the load.

[0055] In some embodiments, Figure 1 As shown, the rectifier unit 1 includes: a first rectifier bridge DB1 and a second rectifier bridge DB2.

[0056] Among them, the first end D1 of the first rectifier bridge DB1 is connected to the first output end of the first relay QF1, the second end D2 of the first rectifier bridge DB1 is connected to the first input end of the inverter unit 2, the third end D3 of the first rectifier bridge DB1 is connected to the second output end of the first relay QF1, and the fourth end of the first rectifier bridge DB1 is connected to the second output end of the inverter unit 2; the first end of the second rectifier bridge DB2 is connected to the first output end of the second relay QF2, the second end of the second rectifier bridge DB2 is connected to the first input end of the inverter unit 2, the third end of the second rectifier bridge DB2 is connected to the second output end of the second relay QF2, and the fourth end of the second rectifier bridge DB2 is connected to the second output end of the inverter unit 2.

[0057] Specifically, when the first power supply fails and the second power supply is normal, the first switch K1 that controls the first relay QF1 is connected to the first contact A and the second switch K2 is connected to the third contact C. If the first rectifier bridge DB1 and the second rectifier bridge DB2 are both normal, the AC signal output by the second power supply can flow into the first rectifier bridge DB1 through the first relay QF1. The first rectifier bridge DB1 has a short switching process. The first rectifier bridge DB1 converts the AC signal into a DC signal. At the same time, the AC signal output by the second power supply can flow into the second rectifier bridge DB2 through the second relay QF2. The second rectifier bridge DB2 converts the AC signal into a DC signal. Therefore, the first rectifier bridge DB1 and the second rectifier bridge DB2 remain in operation when they are normal, thereby improving the access capacity of the main power grid; if the first rectifier bridge DB1 is normal and the second rectifier bridge DB2 is abnormal, the first rectifier bridge DB1 converts the AC signal output by the second power supply into a DC signal; if the second rectifier bridge DB2 is normal and the first rectifier bridge DB1 is abnormal, the second rectifier bridge DB2 converts the AC signal output by the second power supply into a DC signal.

[0058] Alternatively, when the first power supply is normal and the second power supply fails, the third switch K3 controlling the second relay QF2 is connected to the fifth contact E and the fourth switch K4 is connected to the seventh contact G. If the first rectifier bridge DB1 and the second rectifier bridge DB2 are both normal, the AC signal output by the first power supply can flow into the second rectifier bridge DB2 through the second relay QF2. The second rectifier bridge DB2 has a short switching process, and the second rectifier bridge DB2 converts the AC signal into a DC signal. At the same time, the AC signal output by the first power supply can flow into the first rectifier bridge DB1 through the first relay QF1, and the first rectifier bridge DB1 converts the AC signal into a DC signal. If the first rectifier bridge DB1 is normal and the second rectifier bridge DB2 is abnormal, the first rectifier bridge DB1 converts the AC signal output by the first power supply into a DC signal. If the second rectifier bridge DB2 is normal and the first rectifier bridge DB1 is abnormal, the second rectifier bridge DB2 converts the AC signal output by the first power supply into a DC signal.

[0059] In addition, after the first rectifier bridge DB1 or the second rectifier bridge DB2 converts the AC signal into a DC signal, the DC bus at the rear end of the rectifier bridge is ensured to be continuously energized through DC bus convergence, which can also avoid interference problems caused by switching the front-end power supply and achieve the purpose of stable operation of the power grid.

[0060] In some embodiments, the AC power signal used by the load includes an L-phase power signal and an N-phase power signal, such as Figure 1 As shown, the inverter unit 2 includes: a first inverter U1 and a second inverter U2.

[0061] Among them, the input end of the first inverter U1 is the first input end of the inverter unit 2, and the output end of the first inverter U1 is used to convert the DC signal into an L-phase electrical signal; the input end of the second inverter U2 is the second input end of the inverter unit 2, and the output end of the second inverter U2 is used to convert the DC signal into an N-phase electrical signal. That is to say, the first inverter U1 and the second inverter U2 share a DC bus, that is, the input end of the first inverter U1 and the second inverter U2, that is, the positive pole and Figure 1 The black wires between the first inverter U1 and the first rectifier bridge DB1 and the second rectifier bridge DB2 are connected, and the output ends of the first inverter U1 and the second inverter U2, that is, the negative electrodes, are connected to the Figure 1 The second inverter U2 is connected to the first rectifier bridge DB1 and the second rectifier bridge DB2 by gray lines, so that the first inverter U1 and the second inverter U2 are always in working state.

[0062] Based on this, if the first inverter U1 and the second inverter U2 are both normal, the first inverter U1 and the second inverter U2 continue to work normally, that is, after the first inverter U1 and the second inverter U2 receive the DC signal converted from the AC signal by the first rectifier bridge DB1 and / or the second rectifier bridge DB2, the DC signal is converted into an AC signal for use by the load; if the first inverter U1 is normal and the second inverter U2 is abnormal, after the first inverter U1 receives the DC signal converted from the AC signal by the first rectifier bridge DB1 and / or the second rectifier bridge DB2, the DC signal is converted into an AC signal for use by the load; if the first inverter U1 is abnormal and the second inverter U2 is normal, after the second inverter U2 receives the DC signal converted from the AC signal by the first rectifier bridge DB1 and / or the second rectifier bridge DB2, the DC signal is converted into an AC signal for use by the load.

[0063] In the embodiment, at present, the data room and important loads all use dual power supplies to realize power backup. Due to the problems of different frequencies, different phases, different voltages, etc. in the dual power supplies, the dual power supplies cannot be directly connected to the load equipment. Therefore, the power supply needs to be switched through the ATS dual power supply switching device. However, when the ATS fails, the reliability of the power supply cannot be guaranteed. In order to solve this problem, the dual power supply switching device in the present application is provided with redundant rectifier bridges and inverters, that is, when any of the first power supply and the second power supply fails, the first rectifier bridge DB1 and the second rectifier bridge DB2 convert the AC signal output by the first power supply and / or the second power supply into a DC signal, and then convert the DC signal into an AC signal for use by the load through the first inverter U1 and the second inverter U2, so that the AC signal output by the first power supply and the second power supply can supply power to the load. Therefore, when one of the rectifier bridges fails, the other rectifier bridge can still be used to convert the AC signal output by the first power supply and / or the second power supply into a DC signal, and when one of the inverters fails, the other inverter can still be used to convert the DC signal into an AC signal for use by the load. Therefore, compared with switching power through the ATS dual power switching device, the dual power switching device in the present application sets up redundant inverters and rectifier bridges, so that when one of the rectifier bridges and inverters fails, the redundant rectifier bridges and inverters will still work normally, effectively ensuring the reliability of the dual power switching device.

[0064] In some embodiments, Figure 1 As shown, the first rectifier bridge DB1 or the second rectifier bridge DB2 includes: a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4.

[0065] Among them, the anode of the first diode D1 is the first end of the first rectifier bridge DB1 or the first end of the second rectifier bridge DB2, and the cathode of the first diode D1 is the second end of the first rectifier bridge DB1 or the second end of the second rectifier bridge DB2; the cathode of the second diode D2 is connected to the cathode of the first diode D1, and the anode of the second diode D2 is the third end of the first rectifier bridge DB1 or the third end of the second rectifier bridge DB2; the cathode of the third diode D3 is connected to the anode of the second diode D2, and the anode of the third diode D3 is the fourth end of the first rectifier bridge DB1 or the fourth end of the second rectifier bridge DB2; the anode of the fourth diode D4 is connected to the anode of the third diode D3, and the cathode of the fourth diode D4 is connected to the anode of the first diode D1.

[0066] Specifically, when either the first power supply or the second power supply fails, the first rectifier bridge DB1 or the second rectifier bridge DB2 receives the AC signal output by the first power supply and / or the second power supply, and the diodes of the first rectifier bridge DB1 or the second rectifier bridge DB2 are unidirectionally conducted. When the AC signal is in the positive half axis, the AC signal output by the live wire L1 of the first power supply or the live wire L2 of the second power supply flows into the first inverter U1 or the second inverter U2 through the first diode D1, and then flows back to the neutral wire N1 of the first power supply or the neutral wire N2 of the second power supply through the third diode D3. When the AC signal is in the negative half axis, the AC signal output by the neutral wire N1 or the neutral wire N2 flows into the first inverter U1 or the second inverter U2 through the second diode D2, and then flows back to the live wire L1 or the live wire L2 through the fourth diode D4. Thus, the first rectifier bridge DB1 or the second rectifier bridge DB2 converts the AC signal into a DC signal.

[0067] Reference below Figure 2 The control process of the dual power switching device according to the embodiment of the utility model is illustrated by way of example, and the specific contents are as follows.

[0068] In step S1, the first power supply supplies power to the load, and then step S3 is executed.

[0069] Step S2: the second power supply supplies power to the load, and then step S4 is executed.

[0070] In step S3, the first rectifier converts the AC signal output by the first power supply into a DC signal, and then executes step S5.

[0071] In step S4, the second rectifier converts the AC signal output by the second power supply into a DC signal, and then executes step S5.

[0072] Step S5: The DC bus converges the DC power signal, and then steps S6 and S7 are executed.

[0073] Step S6: The first inverter converts the DC power signal into an AC power signal for use by the load, and then executes step S8.

[0074] Step S7: The second inverter converts the DC power signal into an AC power signal for use by the load, and then executes step S8.

[0075] Step S8, supplying power to the load through an AC power signal.

[0076] Reference below Figure 3 The control process of the dual power switching device according to the embodiment of the utility model is illustrated by way of example, and the specific contents are as follows.

[0077] Step S9: If the second power supply fails, control the first power supply to supply power to the load, and execute steps S10 and S11.

[0078] In step S10, the first rectifier converts the AC signal output by the first power supply into a DC signal, and then executes step S5.

[0079] In step S11, the second rectifier converts the AC signal output by the first power supply into a DC signal, and then executes step S5.

[0080] Step S5: The DC bus converges the DC power signal, and then steps S6 and S7 are executed.

[0081] Step S6: The first inverter converts the DC power signal into an AC power signal for use by the load, and then executes step S8.

[0082] Step S7: The second inverter converts the DC power signal into an AC power signal for use by the load, and then executes step S8.

[0083] Step S8, supplying power to the load through an AC power signal.

[0084] Reference below Figure 4 The control process of the dual power switching device according to the embodiment of the utility model is illustrated by way of example, and the specific contents are as follows.

[0085] Step S12: If the first power supply fails, control the second power supply to supply power to the load, and execute steps S13 and S14.

[0086] In step S13, the first rectifier converts the AC signal output by the second power supply into a DC signal, and then executes step S5.

[0087] In step S14, the second rectifier converts the AC signal output by the second power supply into a DC signal, and then executes step S5.

[0088] Step S5: The DC bus converges the DC power signal, and then steps S6 and S7 are executed.

[0089] Step S6: The first inverter converts the DC power signal into an AC power signal for use by the load, and then executes step S8.

[0090] Step S7: The second inverter converts the DC power signal into an AC power signal for use by the load, and then executes step S8.

[0091] Step S8, supplying power to the load through an AC power signal.

[0092] The second aspect of the utility model provides a power supply system 20, such as Figure 5 As shown, it includes: a first power supply 3, a second power supply 4 and the dual power supply switching device 10 of the above embodiment. The function of the power supply system is to provide the required power for the equipment to ensure its normal operation and the reliability of power supply quality.

[0093] The dual power switching device 10 is connected to the first power source 3 and the second power source 4 .

[0094] According to the power supply system of the utility model, the dual power supply switching device of the above embodiment can avoid the problem of contact arcing and sintering due to contact overload, and can also avoid the problem of instantaneous power failure of the load due to power switching.

[0095] The third aspect of the utility model provides an electrical device 30, such as Figure 6 As shown, it includes the power supply system 20 of the above embodiment. The electrical equipment can be a generator, a transformer, a power line, a circuit breaker and other equipment.

[0096] According to the electrical equipment of the utility model, the power supply system of the above embodiment can avoid the problem of contact arcing and sintering due to contact overload, and can also avoid the problem of instantaneous power failure of load due to power switching.

[0097] The third aspect of the present invention provides a vehicle 100, such as Figure 7 As shown, the vehicle includes the power supply system 20 of the above embodiment.

[0098] According to the vehicle of the utility model, the power supply system of the above embodiment can avoid the problem of contact arcing and sintering due to contact overload, and can also avoid the problem of instantaneous power failure of the load due to power switching.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0100] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A dual power switching device, characterized in that: Used in a power supply system, the power supply system includes a first power supply and a second power supply, and the dual power supply switching device includes: a first relay, wherein an input end of the first relay is connected to the first power supply and the second power supply, an output end of the first relay is adapted to output an AC signal of the first power supply or the second power supply, and the first relay is used to be connected to the first power supply in a normal state, and to be connected to the second power supply when the first power supply fails; A second relay, wherein an input end of the second relay is connected to the first power supply and the second power supply, an output end of the second relay is suitable for outputting an AC signal of the first power supply or the second power supply, and the second relay is used to be connected to the second power supply in a normal state, and to be connected to the first power supply when the second power supply fails.

2. The dual power switching device according to claim 1, characterized in that: The first relay includes a first contact, a second contact, a third contact, a fourth contact, a first switch and a second switch, the first contact is connected to the live wire of the second power supply, the second contact is connected to the live wire of the first power supply, the third contact is connected to the neutral wire of the second power supply, and the fourth contact is connected to the neutral wire of the first power supply; Wherein, in a normal state, the first relay is energized, the first switch is connected to the second contact and the second switch is connected to the fourth contact, and when the first power supply fails, the first relay is de-energized, the first switch is connected to the first contact and the second switch is connected to the third contact.

3. The dual power switching device according to claim 1, characterized in that: The second relay includes a fifth contact, a sixth contact, a seventh contact, an eighth contact, a third switch and a fourth switch, the fifth contact is connected to the live wire of the first power supply, the sixth contact is connected to the live wire of the second power supply, the seventh contact is connected to the neutral wire of the first power supply, and the eighth contact is connected to the neutral wire of the second power supply; In which, in a normal state, the second relay is energized, the third switch is connected to the sixth contact and the fourth switch is connected to the eighth contact, and when the second power supply fails, the second relay is de-energized, the third switch is connected to the fifth contact and the fourth switch is connected to the seventh contact.

4. The dual power switching device according to any one of claims 1 to 3, characterized in that: The dual power switching device also includes: a rectifier unit, the rectifier unit being connected to an output end of the first relay and an output end of the second relay, and the rectifier unit being used to convert an AC signal output by the first power supply and / or the second power supply into a DC signal; An inverter unit is connected to the rectifier unit, and is used to convert the DC signal into an AC signal for use by a load.

5. The dual power switching device according to claim 4, characterized in that: The rectifying unit comprises: a first rectifier bridge, wherein a first end of the first rectifier bridge is connected to a first output end of the first relay, a second end of the first rectifier bridge is connected to a first input end of the inverter unit, a third end of the first rectifier bridge is connected to a second output end of the first relay, and a fourth end of the first rectifier bridge is connected to a second output end of the inverter unit; A second rectifier bridge, wherein the first end of the second rectifier bridge is connected to the first output end of the second relay, the second end of the second rectifier bridge is connected to the first input end of the inverter unit, the third end of the second rectifier bridge is connected to the second output end of the second relay, and the fourth end of the second rectifier bridge is connected to the second output end of the inverter unit.

6. The dual power switching device according to claim 5, characterized in that: The AC power signal for the load includes an L-phase power signal and an N-phase power signal, and the inverter unit includes: A first inverter, wherein an input end of the first inverter is a first input end of the inverter unit, and an output end of the first inverter is used for converting the DC electric signal into an L-phase electric signal; A second inverter, wherein the input end of the second inverter is the second input end of the inverter unit, and the output end of the second inverter is used for converting the DC electric signal into an N-phase electric signal.

7. The dual power switching device according to claim 5, characterized in that: The first rectifier bridge or the second rectifier bridge comprises: a first diode, wherein an anode of the first diode is the first end of the first rectifier bridge or the first end of the second rectifier bridge, and a cathode of the first diode is the second end of the first rectifier bridge or the second end of the second rectifier bridge; a second diode, wherein a cathode of the second diode is connected to a cathode of the first diode, and an anode of the second diode is the third end of the first rectifier bridge or the third end of the second rectifier bridge; a third diode, wherein a cathode of the third diode is connected to an anode of the second diode, and an anode of the third diode is the fourth end of the first rectifier bridge or the fourth end of the second rectifier bridge; A fourth diode, wherein an anode of the fourth diode is connected to an anode of the third diode, and a cathode of the fourth diode is connected to an anode of the first diode.

8. A power supply system, characterized in that: include: a first power source and a second power source; The dual power switching device according to any one of claims 1 to 7, wherein the dual power switching device is connected to the first power supply and the second power supply.

9. An electrical device, characterized in that: A power supply system comprising the power supply system as claimed in claim 8.

10. A vehicle, characterized in that: A power supply system comprising the power supply system as claimed in claim 8.

Images