A time-division multiplexing three-port converter and method for civil aircraft

Abstract

This invention proposes a time-division multiplexing three-port converter and method. This time-division multiplexing three-port converter integrates two separate modules—a battery charger and a static converter—into a single module through time-division multiplexing, thereby allowing a single three-port converter to replace both the individual battery charger and static converter.

Description

Technical Field

[0001] This invention belongs to the field of power conversion technology, and specifically relates to a time-division multiplexing three-port converter and method. Background Technology

[0002] In current civil aircraft power systems, the battery charger and static converter are two separate modules. The battery charger is powered by an AC busbar, converting 115V three-phase AC power to 28V DC power to charge the battery; the static converter is powered by the battery, converting 28V DC power to 115V single-phase AC power to power a single-phase AC busbar.

[0003] Considering that battery chargers and static converters are not used simultaneously in civil aircraft power systems, and that their topologies overlap to some extent, in order to further improve the integration of power systems, systems and methods that can improve upon the shortcomings of existing technologies are needed. Summary of the Invention

[0004] This summary is provided to introduce, in a simplified form, some concepts that will be further described in the following detailed description section. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0005] This invention proposes a time-division multiplexing three-port converter for civil aircraft, which integrates two separate modules, a battery charger and a static converter, into one module through time-division multiplexing. This integration of the battery charger and static converter reduces the number of system modules and the control complexity, thereby reducing the system's size, weight, and cost, and improving system stability.

[0006] In one embodiment of the present invention, the proposed three-port converter is composed of two sets of conversion devices. The first set of devices includes an autotransformer rectifier, a three-phase bridge rectifier circuit, an LC filter circuit, a converter circuit, and a first circuit forming part of a single-phase bridge DC / DC converter. The second set of devices includes two phase arms of the three-phase bridge rectifier circuit, an LC filter circuit, a converter circuit, a second circuit forming part of a single-phase bridge DC / AC converter, and a third circuit forming part of a push-pull forward converter circuit. The two phase arms of the three-phase bridge rectifier circuit, the LC filter circuit, and the converter circuit are time-division multiplexed.

[0007] The three-port converter also includes four contactors KM1 to KM4 and a switch S. The states of the contactors and the switch are controlled by a control circuit.

[0008] In battery charging mode (with the three-phase AC busbar supplying power normally), contactors KM1 to KM4 are connected to contact 1, switch S is closed, and the converter circuit is used to form part of a single-phase bridge DC / DC converter. At this time, the three-port converter converts the 115V three-phase AC power provided by the three-phase AC busbar into 28V DC power to supply power to the battery.

[0009] In battery discharge mode (three-phase AC busbar loss), contactors KM1 to KM4 are connected to contact 2, switch S is open, and the converter circuit is used to form part of a single-phase bridge DC / AC converter. At this time, the three-port converter converts the 28V DC power supplied by the battery into 115V single-phase AC power to power the single-phase AC busbar.

[0010] Specifically, according to the above embodiments of the present invention, a time-division multiplexing three-port converter is disclosed, the time-division multiplexing three-port converter comprising:

[0011] A three-phase bridge rectifier circuit, wherein two phase arms of the three-phase bridge rectifier circuit are respectively connected to the first contactor and the second contactor, and the remaining single-phase bridge arm is connected to the switch.

[0012] An LC filter circuit, wherein the LC filter circuit is connected to the three-phase bridge rectifier circuit; and

[0013] The converter circuit is connected to the LC filter circuit, as well as the third and fourth contactors.

[0014] When the first contactor, the second contactor, the third contactor, and the fourth contactor are all connected to the first contact and the switch is closed, the converter circuit is used to form part of a single-phase bridge DC / DC converter, and the time-division multiplexed three-port converter is used as a battery charger.

[0015] When the first contactor, the second contactor, the third contactor, and the fourth contactor are all connected to the second contact and the switch is open, the converter circuit is used to form part of a single-phase bridge DC / AC converter and the time-division multiplexed three-port converter is used as a static converter.

[0016] In one embodiment of the present invention, the time-division multiplexing three-port converter further includes:

[0017] An autotransformer rectifier connected to a three-phase AC busbar; and

[0018] A first circuit used to form part of the single-phase bridge DC / DC converter.

[0019] The converter circuit and the first circuit together form the single-phase bridge DC / DC converter, and the autotransformer rectifier, the three-phase bridge rectifier circuit, the LC filter circuit, and the single-phase bridge DC / DC converter together form the circuit for the battery charger.

[0020] In one embodiment of the present invention, the time-division multiplexing three-port converter further includes:

[0021] A second circuit for forming part of the single-phase bridge DC / AC converter; and

[0022] A third circuit used to form part of a push-pull forward converter circuit.

[0023] The converter circuit and the second circuit together form the single-phase bridge DC / AC converter, the two-phase bridge arm and the LC filter circuit together with the third circuit together form the push-pull forward circuit, and the push-pull forward circuit and the single-phase bridge DC / AC converter together form the circuit for the static converter.

[0024] In one embodiment of the present invention, the states of the first contactor, the second contactor, the third contactor, the fourth contactor, and the switch are controlled by a controller.

[0025] In this embodiment of the invention, when the three-phase AC busbar is working normally, the controller controls the first contactor, the second contactor, the third contactor and the fourth contactor to be connected to the first contact and the switch to be closed; and when the three-phase AC busbar fails, the controller controls the first contactor, the second contactor, the third contactor and the fourth contactor to be connected to the second contact and the switch to be open.

[0026] In this embodiment of the invention, when the three-phase AC busbar is working normally, the time-division multiplexing three-port converter is in battery charging mode and converts the 115V three-phase AC power provided by the three-phase AC busbar into 28V DC power to supply power to the battery; and when the three-phase AC busbar fails, the time-division multiplexing three-port converter is in battery discharging mode and converts the 28V DC power provided by the battery into 115V single-phase AC power to supply power to the single-phase AC busbar.

[0027] In another embodiment of the present invention, a method for a three-port converter is disclosed, the three-port converter including four contactors and a switch, the method comprising:

[0028] Determine if the three-phase AC busbar is working properly;

[0029] If so, then connect each of the four contactors to the first contact and close the switch so that the three-port converter is used as a battery charger.

[0030] If not, then connect each of the four contactors to the second contact and disconnect the switch so that the three-port converter is used as a static converter.

[0031] In one embodiment of the invention, the states of the four contactors and the switches are controlled by a controller such that:

[0032] When the three-phase AC busbar is operating normally, the three-port converter enters battery charging mode, and the battery charger is configured to convert the 115V three-phase AC power provided by the three-phase AC busbar into 28V DC power to supply power to the battery; and

[0033] When the three-phase AC busbar is not working properly, the time-division multiplexing three-port converter enters the battery discharge mode, and the static converter is configured to convert the 28V DC power supplied by the battery into 115V single-phase AC power to supply power to the single-phase AC busbar.

[0034] In one embodiment of the present invention, the time-division multiplexing three-port converter includes:

[0035] A three-phase bridge rectifier circuit, wherein two phase arms of the three-phase bridge rectifier circuit are respectively connected to the first and second contactors of the four contactors, and the remaining single-phase bridge arm is connected to the switch.

[0036] An LC filter circuit, wherein the LC filter circuit is connected to the three-phase bridge rectifier circuit; and

[0037] A converter circuit, which is connected to the LC filter circuit and to the third and fourth contactors of the four contactors.

[0038] In the above embodiments of the present invention, the method further includes:

[0039] With the three-phase AC busbar operating normally, the converter circuit is used to form a single-phase bridge DC / DC converter so that the three-port converter can be used as the battery charger; and

[0040] When the three-phase AC busbar is not working properly, the converter circuit is used to form a single-phase bridge DC / AC converter so that the three-port converter can be used as the static converter.

[0041] Other aspects, features, and embodiments of the invention will become apparent to those skilled in the art after reading the following description of specific exemplary embodiments of the invention in conjunction with the accompanying drawings. Although features of the invention may be discussed below with reference to certain embodiments and drawings, all embodiments of the invention may include one or more of the advantageous features discussed herein. In other words, while one or more embodiments may be discussed having certain advantageous features, one or more of such features may also be used according to the various embodiments of the invention discussed herein. Similarly, although exemplary embodiments may be discussed below as embodiments of devices, systems, or methods, it should be understood that such exemplary embodiments may be implemented in various devices, systems, and methods. Attached Figure Description

[0042] To gain a more detailed understanding of the features described above in this disclosure, reference can be made to a more specific description of the above-briefly summarized aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as other equivalent aspects are permissible in this description.

[0043] Figure 1 A block diagram of a three-port converter structure according to an embodiment of the present invention is shown.

[0044] Figure 2 A block diagram of a battery charger structure according to an embodiment of the present invention is shown.

[0045] Figure 3 A block diagram of a static converter structure according to an embodiment of the present invention is shown.

[0046] Figure 4 A flowchart of a method for a three-port converter according to an embodiment of the present invention is shown. Detailed Implementation

[0047] The various embodiments will now be described in more detail with reference to the accompanying drawings, which form part of this invention and illustrate specific exemplary embodiments. However, the embodiments may be implemented in many different forms and should not be construed as limiting the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of these embodiments to those skilled in the art. The embodiments may be implemented as methods, systems, or devices. Therefore, these embodiments may be implemented in hardware, entirely in software, or in a combination of software and hardware aspects. Therefore, the following detailed description is not intended to be limiting.

[0048] The steps in each flowchart can be performed by hardware (e.g., processor, engine, memory, circuitry), software (e.g., operating system, application, driver, machine / processor executable instructions), or a combination thereof. As will be understood by those skilled in the art, the methods involved in each embodiment may include more or fewer steps than shown.

[0049] Considering that battery chargers and static converters are not used simultaneously in civil aircraft power systems and that their topologies overlap to a certain extent, in order to further improve the integration of the power system, the technical solution of this invention includes a battery charger and a static converter integrated without affecting the power system architecture, as well as a time-division multiplexing method for the battery charger and the static converter.

[0050] The various aspects of the present invention will now be described in detail.

[0051] Figure 1 A block diagram of a three-port converter structure according to an embodiment of the present invention is shown. Figure 1 As shown, the three-port converter structure includes the following circuits and components.

[0052] The 115V three-phase AC power supplied by the three-phase AC busbar passes through the autotransformer rectifier (ATRU) 102 in the three-port converter. The three-port converter also includes a first contactor KM1 and a second contactor KM2, shown in dashed box 106, and a switch S. The first and second contactors are connected to two phase arms of the three-phase bridge rectifier circuit 108 included in the three-port converter, and the switch S is connected to the remaining single-phase bridge arm.

[0053] Figure 1 Further illustrated, the three-port converter includes an LC filter circuit 110 connected to the three-phase bridge rectifier circuit 108 and further connected to the converter circuit 112. The converter circuit 112 can... Figure 1 The three-port converter shown is used in battery charging mode and battery discharging mode to form part of the corresponding single-phase bridge DC / DC converter and single-phase bridge DC / AC converter, which will be described in more detail below.

[0054] The three-port converter also includes a third contactor KM3 and a fourth contactor KM4 shown in dashed box 114. These two contactors, as well as the first and second contactors mentioned above, each have a first contact (contact 1) and a second contact (contact 2), and the third and fourth contactors are respectively connected to the converter circuit 112.

[0055] In one embodiment of the present invention, Figure 1 The three-port converter shown further includes a first circuit 118.

[0056] when Figure 1 When all four contactors KM1-4 shown are connected to the first contact and switch S is closed (i.e., when the three-phase AC busbar is operating normally and the three-port converter is in battery charging mode), the first circuit 118 and the converter circuit 112 together form a single-phase bridge DC / DC converter, and the three-port converter is used as a battery charger. At this time, the autotransformer rectifier (ATRU) 102, the three-phase bridge rectifier circuit 108, the LC filter circuit 110, and the formed single-phase bridge DC / DC converter together form the circuit for the battery charger. This will... Figure 2 It is shown in more detail below.

[0057] In one embodiment of the present invention, Figure 1 The three-port converter shown further includes a second circuit 120 and a third circuit 116.

[0058] when Figure 1 When all four contactors KM1-4 shown are connected to the second contact and switch S is open (i.e., when the three-phase AC busbar is not functioning properly (e.g., malfunction) and the three-port converter is in battery discharge mode), the second circuit 120 and converter circuit 112 together form a single-phase bridge DC / AC converter. The third circuit 116, together with the two-phase bridge arms of the three-phase bridge rectifier circuit 108 connected to the first and second contactors and the LC filter circuit, together form a push-pull forward circuit, and the three-port converter is used as a static converter. At this time, the formed push-pull forward circuit and the single-phase bridge DC / AC converter together form the circuitry for the static converter. This will... Figure 3 It is shown in more detail below.

[0059] In one embodiment of the present invention, Figure 1 The states of the four contactors KM1-4 and switch S shown can be controlled by controller 104.

[0060] Specifically, on one hand, when the three-phase AC busbar is working normally, the controller can connect all four contactors KM1-4 to the first contact and close the switch S, so that the three-port converter can be in battery charging mode. In this mode, the three-port converter can be used as a battery charger. The three-port converter converts the 115V three-phase AC power provided by the three-phase AC busbar into 28V DC power to power the battery. That is, the 115V three-phase AC power passes through the autotransformer rectifier (ATRU) 102, the three-phase bridge rectifier circuit 108, the LC filter circuit 110, and the single-phase bridge DC / DC converter (formed by the converter circuit 112 and the first circuit 118), and is finally converted into 28V DC power to power the battery.

[0061] On the other hand, when the three-phase AC busbar is not working properly, the controller can connect all four contactors KM1-4 to the second contact and open the switch S, so that the three-port converter can be in battery discharge mode. In this mode, the three-port converter can be used as a static converter. The three-port converter converts the 28V DC power supplied by the battery into 115V single-phase AC power to power the single-phase AC busbar. That is, the 28V DC power passes through the push-pull forward converter circuit (formed by the third circuit 116, the two-phase bridge arms connected to the first and second contactors in the three-phase bridge rectifier circuit 108, and the LC filter circuit 110), and the single-phase bridge DC / AC converter (formed by the converter circuit 112 and the second circuit 120), and is finally converted into 115V single-phase AC power to power the single-phase AC busbar.

[0062] thus, Figure 1 The three-port converter shown includes an autotransformer rectifier (ATRU) 102, a three-phase bridge rectifier circuit 108, an LC filter circuit 110, a converter circuit 112, a single-phase bridge DC / DC converter, a push-pull forward converter, and a single-phase bridge DC / AC converter. Two phase arms of the three-phase bridge rectifier circuit 108, the LC filter circuit 110, and the converter circuit 112 are time-division multiplexed, thereby reducing the number of system modules and control complexity, thus reducing the system's size, weight, and cost, and improving system stability.

[0063] Figure 2 A block diagram of a battery charger structure according to an embodiment of the present invention is shown.

[0064] In one embodiment of the present invention, in battery charging mode (with the three-phase AC busbar normally powered), contactors KM1 to KM4 are connected to contact 1, and switch S is closed. Figure 2 As shown, the 115V three-phase AC power is converted into 28V DC power through an autotransformer rectifier (ATRU), a three-phase bridge rectifier circuit, an LC filter circuit, and a single-phase bridge DC / DC converter to power the battery. Correspondingly, as... Figure 1 As shown, 28V DC power is converted into 115V single-phase AC power through a push-pull forward converter circuit (formed by the third circuit 116, the two-phase bridge arms connected to the first and second contactors in the three-phase bridge rectifier circuit 108, and the LC filter circuit 110) and a single-phase bridge DC / AC converter (formed by the converter circuit 112 and the second circuit 120) to power the single-phase AC busbar.

[0065] Figure 3 A block diagram of a static converter structure according to an embodiment of the present invention is shown.

[0066] In one embodiment of the invention, in battery discharge mode (powered only by the battery) (three-phase AC busbar loss), contactors KM1-KM4 are connected to contact 2, and switch S is open. Figure 3 As shown, the 28V DC power is converted into 115V single-phase AC power through a push-pull forward converter and a single-phase bridge DC / AC converter to power the single-phase AC busbar. Correspondingly, as... Figure 1 As shown, 28V DC power is converted into 115V single-phase AC power through a push-pull forward converter circuit (formed by the third circuit 116, the two-phase bridge arms connected to the first and second contactors in the three-phase bridge rectifier circuit 108, and the LC filter circuit 110) and a single-phase bridge DC / AC converter (formed by the converter circuit 112 and the second circuit 120) to power the single-phase AC busbar.

[0067] Figure 4 A flowchart of a method for a three-port converter according to an embodiment of the present invention is shown.

[0068] After the method starts, it first determines whether the three-phase AC busbar is working properly.

[0069] If so, the three-port converter enters normal operating mode (i.e., battery charging mode), and contactors KM1 to KM4 are connected to contact 1, and switch S is closed so that the three-port converter is used as a battery charger, and the three-phase 115VAC provided by the three-phase AC busbar is converted to 28VDC to power the battery.

[0070] If not (for example, when the three-phase AC busbar fails), the three-port converter enters the battery power supply mode (i.e., battery discharge mode), and contactors KM1 to KM4 are connected to contact 2, and switch S is opened, so that the three-port converter is used as a static converter, and the 28VDC provided by the battery is converted to single-phase 115VAC to power the single-phase AC busbar.

[0071] The embodiments of the present invention have been described above with reference to block diagrams and / or operating instructions of methods, systems, and computer program products according to embodiments of the present invention. The above descriptions are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0072] Furthermore, the embodiments are merely illustrative of the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. A time-division multiplexing three-port converter, comprising: A three-phase bridge rectifier circuit, wherein two phase arms of the three-phase bridge rectifier circuit are respectively connected to the first contactor and the second contactor, and the remaining single-phase bridge arm is connected to the switch. An LC filter circuit, wherein the LC filter circuit is connected to the three-phase bridge rectifier circuit; A converter circuit, which is connected to the LC filter circuit, the third contactor, and the fourth contactor; First circuit; Second circuit; as well as Third circuit, When the first contactor, the second contactor, the third contactor, and the fourth contactor are all connected to the first contact and the switch is closed, the first circuit and the converter circuit together form a single-phase bridge DC / DC converter, and the time-division multiplexed three-port converter is used as a battery charger. When the first contactor, the second contactor, the third contactor, and the fourth contactor are all connected to the second contact and the switch is open, the second circuit and the converter circuit together form a single-phase bridge DC / AC converter, the two-phase bridge arm and the LC filter circuit together with the third circuit form a push-pull forward converter, and the time-division multiplexed three-port converter is used as a static converter.

2. The time-division multiplexing three-port converter as described in claim 1, further comprising an autotransformer rectifier connected to the three-phase AC busbar. Furthermore, the autotransformer rectifier, the three-phase bridge rectifier circuit, the LC filter circuit, and the single-phase bridge DC / DC converter together form the circuit for the battery charger.

3. The time-division multiplexing three-port converter as described in claim 1, wherein the push-pull forward converter and the single-phase bridge DC / AC converter together form the circuit for the static converter.

4. The time-division multiplexing three-port converter as described in claim 1, wherein the states of the first contactor, the second contactor, the third contactor, the fourth contactor, and the switch are controlled by a controller.

5. The time-division multiplexing three-port converter as described in claim 4, wherein: When the three-phase AC busbar is working normally, the controller controls the first contactor, the second contactor, the third contactor and the fourth contactor to be connected to the first contact and the switch to be closed; and When the three-phase AC busbar fails, the controller controls the first contactor, the second contactor, the third contactor and the fourth contactor to all connect to the second contact and the switch to open.

6. The time-division multiplexing three-port converter as described in claim 5, wherein: When the three-phase AC busbar is operating normally, the time-division multiplexing three-port converter is in battery charging mode and converts the 115V three-phase AC power provided by the three-phase AC busbar into 28V DC power to supply the battery; and When the three-phase AC busbar fails, the time-division multiplexing three-port converter is in battery discharge mode and converts the 28V DC power provided by the battery into 115V single-phase AC power to supply power to the single-phase AC busbar.

7. A method for a time-division multiplexing three-port converter as described in claim 1, comprising: Determine if the three-phase AC busbar is working properly; If so, then connect each of the four contactors to the first contact and close the switch so that the three-port converter is used as a battery charger. If not, then connect each of the four contactors to the second contact and disconnect the switch so that the three-port converter is used as a static converter.

8. The method of claim 7, wherein the states of the four contactors and the switch are controlled by a controller such that: When the three-phase AC busbar is operating normally, the three-port converter enters battery charging mode, and the battery charger is configured to convert the 115V three-phase AC power provided by the three-phase AC busbar into 28V DC power to supply power to the battery; and When the three-phase AC busbar is not working properly, the time-division multiplexing three-port converter enters the battery discharge mode, and the static converter is configured to convert the 28V DC power supplied by the battery into 115V single-phase AC power to supply power to the single-phase AC busbar.

9. The method of claim 7, further comprising: With the three-phase AC busbar operating normally, the converter circuit is used to form a single-phase bridge DC / DC converter so that the three-port converter can be used as the battery charger. as well as When the three-phase AC busbar is not working properly, the converter circuit is used to form a single-phase bridge DC / AC converter so that the three-port converter can be used as the static converter.

Images