A direct current interconnection contactor system

Abstract

The application belongs to the technical field of aviation power distribution, and particularly relates to a direct current interconnection contactor system. The system comprises a direct current interconnection contactor (3), a first controller (4), a second controller (5) and a management relay (8). The input end of the first controller (4) is connected with a first bus bar (1) and a first contactor (6), the output end is connected with a normally closed contact of the management relay (8) and a relay coil of the management relay (8) respectively. The input end of the second controller (5) is connected with a second bus bar (2) and a second contactor (7), the output end is connected with a normally closed contact of the management relay (8) and a relay coil of the management relay (8) respectively. The output end of the management relay (8) is connected with a relay coil of the direct current interconnection contactor (3). The application can realize power supply conversion between direct current bus bars and prevent single-sided overcurrent fault from spreading to the other side.

Description

Technical Field

[0001] This application belongs to the field of aviation power distribution technology, specifically relating to a DC interconnect contactor system. Background Technology

[0002] To ensure the continuity of DC power supply to the aircraft, a DC interconnect contactor (DCBTC) is typically placed between the two DC busbars. This DC interconnect contactor is used to convert the DC power supply, such as... Figure 1 As shown. During normal aircraft cruise, converter 1 provides DC power to the load on the left channel by converting the onboard primary power to 28V, and converter 2 provides DC power to the load on the right channel by converting the onboard primary power to 28V. If a converter or busbar in a certain channel fails, the busbar on the opposite side is powered by activating the interconnecting contactor DCBTC. To ensure uninterrupted power supply to the aircraft's DC loads, this can be achieved through load redundancy power supply, or by designing a control strategy for the interconnecting contactor DCBTC to ensure uninterrupted power supply to the DC busbars, thereby guaranteeing uninterrupted power supply to the DC loads.

[0003] DC interconnect contactors (DCBTC) are typically controlled to turn on or off by a controller or converter, or by relay interlocking.

[0004] Using relays to control DC-BTC contactors is the control method chosen by most current models. This method is logically simple and only requires using one set of normally closed auxiliary contacts from each of the left and right converters to output the contactor. (See reference...) Figure 1 When both contactor NV1C on the left and contactor NV2C on the right are closed, DC busbar 1 and DC busbar 2 are normally energized. At this time, reference... Figure 2 When contactors NV1C and NV2C are closed, the relay opening deflects downward, preventing the bus current from reaching the DC interconnect contactor DCBTC normally, thus rendering the DC interconnect contactor DCBTC ineffective. Conversely, when either contactor NV1C is opened, the bus current can reach the DC interconnect contactor DCBTC, causing the DC interconnect contactor DCBTC to start working.

[0005] However, the disadvantage of this method is: (1) If an overcurrent or short circuit fault occurs in the left channel, the controller will control the converter output contactor NVC to disconnect. After disconnection Figure 2 The relay interlocking control method shown will automatically control the interconnecting contactor DCBTC to be turned on, causing the overcurrent or short circuit fault in the left channel to spread to the right channel, causing the entire DC power grid on the machine to lose power; (2) DCBTC can only be closed after NVC is disconnected, so uninterrupted power supply cannot be achieved.

[0006] Many aircraft also use a separate left-side controller to control the DCBTC interconnect contactor in order to save on onboard cable weight, such as... Figure 3 As shown. The status of the output contactor NVC of the converter on the opposite side and the overcurrent signal of the opposite channel involved in the control logic are transmitted by bus. This method can realize power supply conversion and prevent overcurrent faults from spreading, and the control cables are less. However, the disadvantages of this method are: (1) When the left controller fails, the DCBTC will have no driving source, which will lead to the inability to realize the power supply conversion of the DC busbars on both sides, causing the busbar on the faulty side to lose power; (2) Bus failure or the failure of the opposite controller will cause the bus to transmit signals incorrectly, which will also cause the DCBTC to malfunction. Summary of the Invention

[0007] To address the aforementioned issues, this application provides a DC interconnect contactor system with dual controllers for backup control of the DC interconnect contactor (DCBTC). This effectively reduces the DCBTC malfunction rate and enables both busbar overcurrent fault isolation and uninterrupted power supply to the DC busbar.

[0008] The DC interconnect contactor system provided in this application realizes the DC power supply conversion between the two busbars through a DC interconnect contactor disposed between the first busbar and the second busbar. The on-board power supply, after voltage conversion, supplies power to the first busbar through the first contactor and to the second busbar through the second contactor. The DC interconnect contactor system includes:

[0009] A first controller has its input terminals connected to a first busbar and a first contactor, respectively, for receiving voltage and current signals from the first busbar and the status of the first contactor. The output terminals of the first controller are connected to the normally closed contact of a management relay via a first ON channel and to the relay coil of the management relay via a first OFF channel. The first controller is configured to output current through the first ON channel when the first contactor is open and the first busbar has no overcurrent, or when the first busbar has other faults without overcurrent. When the first busbar has an overcurrent fault, it outputs current through the first OFF channel. The first controller is also configured to control the first contactor to open when the first busbar has other faults without overcurrent.

[0010] The second controller has its input terminals connected to the second busbar and the second contactor, respectively, for receiving voltage and current signals from the second busbar and the status of the second contactor. The output terminals of the second controller are connected to the normally closed contact of the management relay via a second ON channel and to the relay coil of the management relay via a second OFF channel. The second controller is configured to output current through the second ON channel when the second contactor is open and the second busbar has no overcurrent, or when the second busbar has other faults without overcurrent. When the second busbar has an overcurrent fault, it outputs current through the second OFF channel. The second controller is also configured to control the second contactor to open when the second busbar has other faults without overcurrent.

[0011] The management relay has its output connected to the relay coil of a DC interconnect contactor.

[0012] Preferably, the other faults without overcurrent include undervoltage or overvoltage.

[0013] Preferably, before the first controller controls the first contactor to disconnect, it further includes a delay of a set time. Similarly, before the second controller controls the second contactor to disconnect, it further includes a delay of a set time.

[0014] Preferably, the set time is associated with a voltage threshold value. When the voltage of the first busbar or the second busbar is within the voltage range associated with the voltage threshold value of different levels, the set time corresponds to the different levels.

[0015] Preferably, before outputting current through the first or second restricted channel, a delay based on an overcurrent threshold value is further included.

[0016] Preferably, the first controller and the second controller are interconnected, and the first controller is used to send the busbar overcurrent signal detected by the second controller to the other controller.

[0017] This application can realize power supply conversion between DC busbars, prevent the spread of overcurrent faults on one side to the other side, and ensure that the power supply to the DC busbars will not be interrupted when the power supply conversion is triggered by non-overcurrent faults. It has high power supply reliability and obvious practical value. Attached Figure Description

[0018] Figure 1 This is a general connection architecture diagram for aircraft DC busbars.

[0019] Figure 2 This is a schematic diagram of a relay interlocking control method.

[0020] Figure 3 This is a schematic diagram of a single-sided controller control method.

[0021] Figure 4 This is a schematic diagram of the architecture of a preferred embodiment of the DC interconnect contactor system of this application.

[0022] Among them, 1-first busbar, 2-second busbar, 3-DC interconnection contactor, 4-first controller, 41-first connection channel, 42-first blocking channel, 5-second controller, 51-second connection channel, 52-second blocking channel, 6-first contactor, 7-second contactor, 8-management relay. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] The on / off control of the DC interconnection contactor (DCBTC) between the two DC busbars in an aircraft directly affects the power supply reliability of the aircraft's DC busbars. Existing control methods on board result in significant defects in the DCBTC contactor, such as malfunction or failure to operate. To improve the reliability of the DC power supply in the aircraft's power distribution system, this application provides a DC interconnection contactor system, firstly combining... Figure 1 and Figure 4 The DC power supply conversion between the first busbar 1 and the second busbar 2 is achieved through a DC interconnection contactor 3 located between them. After voltage conversion, the on-board power supply powers the first busbar 1 via the first contactor 6 and the second busbar 2 via the second contactor 7. If any converter or power supply system fails, causing abnormal current or voltage on the corresponding busbar, the DC interconnection contactor 3 must activate to divert current from the other side to the faulty side, ensuring reliable power supply.

[0025] refer to Figure 4 The DC interconnect contactor system of this application includes:

[0026] A first controller 4 has its input terminals connected to a first busbar 1 and a first contactor 6, respectively, for receiving voltage and current signals from the first busbar 1 and the status of the first contactor 6. The output terminals of the first controller 4 are connected to the normally closed contact of a management relay 8 via a first on-channel 41 and to the relay coil of the management relay 8 via a first off-channel 42. The first controller 4 is configured to output current through the first on-channel 41 when the first contactor 6 is open and the first busbar 1 has no overcurrent, or when the first busbar 1 has other faults that do not cause overcurrent. When the first busbar 1 has an overcurrent fault, it outputs current through the first off-channel 42. The first controller 4 is also configured to control the first contactor 6 to open when the first busbar 1 has other faults that do not cause overcurrent.

[0027] The second controller 5 has its input terminals connected to the second busbar 2 and the second contactor 7, respectively, for receiving voltage and current signals from the second busbar 2 and the status of the second contactor 7. The output terminals of the second controller 5 are connected to the normally closed contact of the management relay 8 through the second on channel 51 and to the relay coil of the management relay 8 through the second off channel 52. The second controller 5 is configured to output current through the second on channel 51 when the second contactor 7 is open and the second busbar 2 has no overcurrent, or when the second busbar 2 has other faults that do not cause overcurrent. When the second busbar 2 has an overcurrent fault, it outputs current through the second off channel 52. The second controller 5 is also configured to control the second contactor 7 to open when the second busbar 2 has other faults that do not cause overcurrent.

[0028] The management relay 8 has its output terminal connected to the relay coil of the DC interconnect contactor 3.

[0029] It should be noted that, Figure 4 The first contactor 6 and the second contactor 7 are not Figure 1 The complete contactors NV1C and NV2C are not the whole thing, but a part of them, combined Figure 2 It can be seen that the complete first contactor 6 (i.e., NV1C) supplies power to the first busbar 1 through the normally open contacts in the second set of contacts. Above the second set of contacts, there is also a first set of contacts, which are auxiliary contacts. In the normally open state, the DC interconnect contactor 3 does not work. Figure 4 The auxiliary contact is shown in the diagram. The first controller 4 can receive the action of the auxiliary contact of the first contactor 6. At the same time, the first controller 4 can also control the second set of contacts of the first contactor 6 to realize the on / off control of the first contactor. The function of the second controller 5 is the same as that of the first controller 4, and will not be described again.

[0030] Based on the above description, in order to achieve the switching control of the DC interconnect contactor 3, this application needs to meet any of the following conditions:

[0031] (1) When the first controller 4 detects that the first contactor 6 on this side is disconnected and there is no busbar overcurrent fault, the first controller 4 outputs a signal through the first connection channel 41 to control the management relay 8 to be connected, and then controls the DC interconnection contactor 3 to be connected.

[0032] (2) When the second controller 5 detects that the second contactor 7 on this side is disconnected and there is no busbar overcurrent fault, the second controller 5 outputs a signal through the second connection channel 51 to control the management relay 8 to be connected, thereby controlling the DC interconnection contactor 3 to be connected.

[0033] In addition, this application can also achieve the following control strategies:

[0034] (3) If the first controller 4 detects a channel fault other than an overcurrent fault, in some optional embodiments, the other faults without overcurrent include undervoltage or overvoltage. In this case, the first connected channel 41 also outputs a signal to control the management relay 8 to connect, thereby controlling the DC interconnect contactor 3 to connect. However, on this basis, it also controls the first contactor 6 to disconnect, at which time the second busbar 2 supplies power to the first busbar 1. The control principle of the second controller 5 is the same and will not be described again. In some optional embodiments, before the first controller 4 controls the first contactor 6 to disconnect, it further includes a delay of a set time. Similarly, before the second controller 5 controls the second contactor 7 to disconnect, it further includes a delay of a set time. That is, the DC interconnect contactor 3 is closed first, and then the first contactor 6 or the second contactor 7 is disconnected, which can ensure that the DC busbar is supplied with power without interruption.

[0035] In some alternative implementations, the set time is associated with a voltage threshold value. When the voltage of the first busbar 1 or the second busbar 2 is within a voltage range associated with different voltage threshold values, the set time corresponds to different threshold values. In this embodiment, the delay time is different when the voltages of the first busbar 1 or the second busbar 2 are different.

[0036] (4) If the first controller detects an overcurrent signal in the first busbar 1, it needs to control the first contactor to disconnect and should send a 28V / OPEN first blocking channel 42. After this signal reaches the management relay 8, the management relay 8 will close, that is, the coil of the management relay 8 will be open, thereby causing the DC interconnecting contactor 3 to disconnect or be unable to connect. The control principle of the second controller 5 is the same, and will not be described again.

[0037] In some alternative implementations, a delay based on an overcurrent threshold is further included before current output is made through the first blocking channel 42 or the second blocking channel 52.

[0038] In some alternative implementations, the first controller 4 and the second controller 5 are interconnected to send the busbar overcurrent signal detected by the controller to the other controller.

[0039] This embodiment achieves redundancy design through mutual signal transmission between the two controllers. For example, when the second controller 5 receives the overcurrent signal from the first controller 4, it knows that the first busbar is overcurrent. At this time, the second controller 5 will no longer send a signal to drive the DC interconnect contactor 3 to close. That is, the second connection channel 51 will no longer output a signal, preventing the risk caused by the first contactor 6 failing to disconnect the DC interconnect contactor 3 and the DC interconnect contactor 3 failing to close. This achieves dual protection.

[0040] This application enables the DC interconnect contactor 3 to be disabled if an overcurrent occurs on either the left or right channel, ensuring that the overcurrent fault does not spread to the other channel. Furthermore, this scheme ensures uninterrupted power supply to the DC busbar by first closing the DC interconnect contactor 3 and then opening either the first contactor 6 or the second contactor 7. Additionally, if one side of the controller fails, the other side's controller can take over, resulting in high reliability.

[0041] Although this application has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, such modifications or improvements made without departing from the spirit of this application are all within the scope of protection claimed in this application.

Claims

1. A DC interconnecting contactor system, wherein a DC power supply conversion between two busbars is achieved by a DC interconnecting contactor (3) disposed between a first busbar (1) and a second busbar (2), wherein the on-board power supply, after voltage conversion, supplies power to the first busbar (1) through the first contactor (6) and supplies power to the second busbar (2) through the second contactor (7), characterized in that, The DC interconnect contactor system includes: The first controller (4) has its input terminals connected to the first busbar (1) and the first contactor (6) respectively, for receiving the voltage and current signals of the first busbar (1) and the status of the first contactor (6). The output terminals of the first controller (4) are connected to the normally closed contacts of the management relay (8) through the first turn-on channel (41) and to the relay coil of the management relay (8) through the first turn-off channel (42). The first controller (4) is configured to output current through the first turn-on channel (41) when the first contactor (6) is open and the first busbar (1) has no overcurrent, or when the first busbar (1) has other faults without overcurrent; and to output current through the first turn-off channel (42) when the first busbar (1) has an overcurrent fault. The first controller (4) is also configured to control the first contactor (6) to open when the first busbar (1) has other faults without overcurrent. The second controller (5) has its input terminals connected to the second busbar (2) and the second contactor (7) respectively, for receiving the voltage and current signals of the second busbar (2) and the status of the second contactor (7). The output terminals of the second controller (5) are connected to the normally closed contacts of the management relay (8) through the second turn-on channel (51) and to the relay coil of the management relay (8) through the second turn-off channel (52). The second controller (5) is configured to output current through the second turn-on channel (51) when the second contactor (7) is open and the second busbar (2) has no overcurrent, or when the second busbar (2) has other faults without overcurrent; and to output current through the second turn-off channel (52) when the second busbar (2) has an overcurrent fault. The second controller (5) is also configured to control the second contactor (7) to open when the second busbar (2) has other faults without overcurrent. The management relay (8) has its output terminal connected to the relay coil of the DC interconnect contactor (3); Other faults that do not have overcurrent include undervoltage or overvoltage.

2. The DC interconnect contactor system as described in claim 1, characterized in that, Before the first controller (4) controls the first contactor (6) to disconnect, it further includes a delay for a set time. Similarly, before the second controller (5) controls the second contactor (7) to disconnect, it further includes a delay for a set time.

3. The DC interconnect contactor system as described in claim 2, characterized in that, The set time is associated with the voltage threshold value. When the voltage of the first busbar (1) or the second busbar (2) is within the voltage range associated with the voltage threshold value of different levels, the set time corresponds to different levels.

4. The DC interconnect contactor system as described in claim 1, characterized in that, Before current output is made through the first restricted channel (42) or the second restricted channel (52), a delay based on the overcurrent threshold is further included.

5. The DC interconnect contactor system as described in claim 1, characterized in that, The first controller (4) is interconnected with the second controller (5) and is used to send the busbar overcurrent signal detected by the controller to the other controller.

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