Time division multiplexing conversion device and control method thereof

Abstract

The invention provides a time division multiplexing conversion device and a control method thereof. The conversion device comprises a first DC / DC unit which is connected with the output of a voltage transformation and rectification unit or a storage battery so as to convert a first voltage into a second voltage; the second DC / DC unit is connected with the input of the starter generator control unit so as to convert the second voltage into a third voltage; the control unit is used for performing time division multiplexing on the first DC / DC unit and the second DC / DC unit according to whether the conversion device is in a charging mode or a discharging mode, in the charging mode, the control unit controls the first DC / DC unit to convert the direct current of the first voltage from the voltage transformation and rectification unit into the direct current of the second voltage so as to charge the storage battery, and in the discharging mode, the control unit controls the second DC / DC unit to convert the direct current of the second voltage from the voltage transformation and rectification unit into the direct current of the second voltage. And the controller is used for controlling the first DC / DC unit to convert the direct current of the first voltage from the voltage transformation and rectification unit or the storage battery into the direct current of the second voltage and controlling the second DC / DC unit to convert the direct current of the second voltage into the direct current of the third voltage so as to supply power to the starter generator control unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power supply system, and more particularly, to a time-division multiplexing conversion device and a control method thereof. BACKGROUND

[0002] In the power supply system of a civil aircraft, the stability and reliability of the power supply are key factors to ensure the safe operation of the aircraft. When the aircraft is on the ground or a single VFG (generator) fails in the air, the power supply system architecture switches to the start APU (auxiliary power unit) mode. At this time, the input power is provided by the RTRU (remote terminal unit) / APU battery, and the start of the APU is completed through the start power generation system. During the start of the APU, the SPU (start power unit) undertakes the DC voltage boosting function to meet the power demand of the APU start.

[0003] However, the use scenario of the start power generation system in the entire flight is extremely limited. Generally, the working time of the SPU does not exceed 168 seconds, and the utilization rate is extremely low. The separate setting of such a low utilization device not only increases the weight of the aircraft (about 11.8 kg), but also significantly increases the development and maintenance costs, and reduces the integration of the system. In addition, the current SPU of a civil aircraft only undertakes the function of power conversion in the start APU scenario, and the utilization rate of the device is not high. The separate setting of the start power unit will increase the weight of the aircraft, the development and maintenance costs, and reduce the integration of the system. Since the use scenario of the SPU is limited, the working time of the SPU in the entire flight cycle is very short, and the utilization rate is low. The separate setting of the device increases the weight, development cost, and maintenance cost.

[0004] In summary, there is a need in the art for improved power supply system technology to improve device utilization, reduce aircraft weight, reduce development and maintenance costs, and improve system integration. SUMMARY

[0005] The summary is provided to present some concepts in a simplified form that will be further described in the detailed description below. The summary is not intended to identify key or essential features of the claimed subject matter nor is it intended to be used to determine the scope of the claimed subject matter.

[0006] In view of the defects in the prior art described above, the purpose of the present application is to improve the utilization of the device and simplify the architecture of the power supply system.

[0007] According to a first aspect of the present application, there is provided a time-division multiplexing conversion device, the time-division multiplexing conversion device comprising: a first DC / DC unit connected to an output of a voltage rectifier unit or a storage battery, for converting a first voltage to a second voltage; a second DC / DC unit connected to an input of a starter generator control unit, for converting the second voltage to a third voltage; and a control unit for time-division multiplexing the first DC / DC unit and the second DC / DC unit according to whether the conversion device is in a charging mode or a discharging mode, wherein in the charging mode, the control unit controls the first DC / DC unit to convert direct current of the first voltage from the voltage rectifier unit to direct current of the second voltage to charge the storage battery, and in the discharging mode, the control unit controls the first DC / DC unit to convert direct current of the first voltage from the voltage rectifier unit or the storage battery to direct current of the second voltage, and controls the second DC / DC unit to convert direct current of the second voltage from the first DC / DC unit to direct current of the third voltage to supply power to the starter generator control unit.

[0008] In one embodiment of the first aspect, the control unit time-division multiplexes the first DC / DC unit and the second DC / DC unit by means of a first switch and a second switch.

[0009] In one embodiment of the first aspect, the control unit switches the first switch and the second switch according to an instruction from the busbar power control unit.

[0010] In one embodiment of the first aspect, in the charging mode, the control unit connects an output of the first DC / DC unit to an input of the storage battery by means of the first switch.

[0011] In one embodiment of the first aspect, in the discharging mode, the control unit connects an output of the first DC / DC unit to an input of the second DC / DC unit by means of the second switch, so that direct current from the voltage rectifier unit or the storage battery goes to the input of the starter generator control unit after passing through both the first DC / DC unit and the second DC / DC unit.

[0012] In one embodiment of the first aspect, whether direct current input to the conversion device is from the voltage rectifier unit or the storage battery is controlled by the busbar power control unit by: closing a voltage rectifier contactor and opening a storage battery starting contactor to connect an output of the voltage rectifier unit to an input of the conversion device; or closing the storage battery starting contactor and opening the voltage rectifier contactor to connect an output of the storage battery to the input of the conversion device.

[0013] In one embodiment of the first aspect, the conversion device further comprises: an input filter unit connected between the output of the voltage rectifier unit or the battery and the input of the first DC / DC unit; and an output filter unit connected between the output of the first DC / DC unit or the second DC / DC unit and the input of the starter generator control unit.

[0014] In one embodiment of the first aspect, the first DC / DC unit and the second DC / DC unit adjust the voltage of the direct current passing through by adjusting the duty cycle, and the first voltage is less than the second voltage, and the second voltage is less than the third voltage.

[0015] According to the second aspect of the present application, a control method for a time-division multiplexing conversion device is provided, the conversion device comprising a first DC / DC unit, a second DC / DC unit, and a control unit, the control method comprising: time-division multiplexing the first DC / DC unit and the second DC / DC unit by the control unit according to whether the conversion device is in a charging mode or a discharging mode, wherein in the charging mode, the control unit controls the first DC / DC unit to convert the direct current of the first voltage from the voltage rectifier unit into the direct current of the second voltage to charge the battery; and in the discharging mode, the control unit controls the first DC / DC unit to convert the direct current of the first voltage from the voltage rectifier unit or the battery into the direct current of the second voltage, and controls the second DC / DC unit to convert the direct current of the second voltage from the first DC / DC unit into the direct current of the third voltage to supply power to the starter generator control unit.

[0016] In one embodiment of the second aspect, the control method further comprises: in the charging mode, connecting the output of the first DC / DC unit to the input of the battery by the control unit through a first switch; and in the discharging mode, connecting the output of the first DC / DC unit to the input of the second DC / DC unit by the control unit through a second switch, so that the direct current from the voltage rectifier unit or the battery goes to the input of the starter generator control unit after passing through both the first DC / DC unit and the second DC / DC unit.

[0017] By adopting the technical solutions provided by the present application, the scene switching of the charging mode and the starting APU mode can be realized by using the internal circuit architecture design and multiplexing switching logic of the device, and obvious weight and cost advantages are achieved.

[0018] These and other features and advantages will become apparent from a reading of the following detailed description taken in conjunction with the associated drawings. It is understood that both the foregoing summary of the application and the following detailed description are of a illustrative and not restrictive nature, and that no limitation is intended, except as and to the extent provided in the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0019] For a more complete understanding of these and other features of the present application, reference is made to the following detailed description and claims, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A circuit structure schematic diagram of a time-shared conversion device according to an embodiment of the present application is illustrated.

[0021] Figure 2 A circuit structure schematic diagram of a time-shared conversion device according to an embodiment of the present application is illustrated.

[0022] Figure 3a And Figure 3b A circuit structure schematic diagram of a time-shared conversion device according to an embodiment of the present application is illustrated.

[0023] Figure 4 A flow chart of a control method for a time-shared conversion device according to an embodiment of the present application is illustrated.

[0024] Figure 5 A block diagram of a hardware implementation of a control unit according to an embodiment of the present application is illustrated. DETAILED DESCRIPTION

[0025] The present application will be described in detail below with reference to the accompanying drawings. The features of the present application will be further apparent from the following detailed description.

[0026] As mentioned above, in order to solve the above technical problems, the present application aims to propose a time-shared conversion device and a control method thereof, so as to make up for the low utilization rate of the battery charger and the starting power supply device, and to achieve the weight reduction of the aircraft platform.

[0027] Specifically, considering that the use scenarios of the battery charger and the SPU do not overlap, and that the device architectures and part of the power conversion modules of the two are similar, the present application realizes the switching of the charging mode / discharging mode by designing the control logic inside the device, simplifies the power supply system architecture, and thus achieves the weight reduction of the aircraft.

[0028] Figure 1 A circuit structure schematic diagram of a time-shared conversion device 100 according to an embodiment of the present application is shown. It should be noted that, Figure 1 For illustrative purposes only, the present application is not limited to Figure 1 the conversion device 100 illustrated in Figure 1 but can be applied to a conversion device including more or less components than those shown in .

[0029] like Figure 1 As shown, the conversion device 100 may include a first DC / DC unit 110, a second DC / DC unit 120, and a control unit 130. The first DC / DC unit 110 is connected to the output of a transformer-rectifier unit 102 (also referred to as a TRU) or a battery 104 (also referred to as an APU battery) to convert a first voltage to a second voltage. The second DC / DC unit 120 is connected to the input of a starter-generator control unit 106 (i.e., connected to an APU starter controller) to convert the second voltage to a third voltage.

[0030] It can be understood that the connection described above is not limited to a direct connection between two devices or units, but rather allows for the addition of other devices or units between them as needed. That is, current can flow between them through these added devices or units. For example, as will be explained below, an input filter unit 150 can be added before the first DC / DC unit 110, and an output filter unit 160 can be added after the first DC / DC unit 110 and / or the second DC / DC unit 120.

[0031] The control unit 130 is used to time-division multiplex the first DC / DC unit 110 and the second DC / DC unit 120 according to whether the converter 100 is in charging mode or discharging mode. Specifically, in charging mode, the control unit 130 controls the first DC / DC unit 110 to convert the DC power from the transformer-rectifier unit 102 at a first voltage to a second voltage to charge the battery 104; in discharging mode, the control unit 130 controls the first DC / DC unit 110 to convert the DC power from the transformer-rectifier unit 102 or the battery 104 at a first voltage to a second voltage, and controls the second DC / DC unit 120 to convert the DC power from the first DC / DC unit 110 at a second voltage to a third voltage to supply power to the starter-generator control unit 106.

[0032] In one example, the control unit 130 can time-division multiplex the first DC / DC unit 110 and the second DC / DC unit 120 via the first switch S1 and the second switch S2. In a further non-limiting example, the control unit 130 can switch the connection of the first switch S1 and the second switch S2 according to instructions from the busbar power control unit 108 (also referred to as the BPCU).

[0033] Specifically, for example, in the charging mode, the control unit 130 can connect the output of the first DC / DC unit 110 to the input of the battery 104 through the first switch S1. For example, in the discharging mode, the control unit 130 can connect the output of the first DC / DC unit 110 to the input of the second DC / DC unit 120 through the second switch S2, so that the direct current from the voltage rectifier unit 102 or the battery 104 goes to the input of the starter generator control unit 106 after passing through both the first DC / DC unit 110 and the second DC / DC unit 120.

[0034] In one example, the conversion device 100 can further include an input filter unit 150 and an output filter unit 160. The input filter unit 150 is connected between the output of the voltage rectifier unit 102 or the battery 104 and the input of the first DC / DC unit 110, and the output filter unit 160 is connected between the output of the first DC / DC unit 110 or the second DC / DC unit 120 and the input of the starter generator control unit 106.

[0035] Similarly, it can be appreciated that the above-mentioned input filter unit 150 or output filter unit 160 connected between two devices or units is not limited to only the input filter unit 150 or output filter unit 160 between the two devices or units, but other devices or units can be added between the two devices or units according to actual needs, that is, the current passes through the added other devices or units, and the input filter unit 150 or output filter unit 160 also flows between the two devices or units. For example, a voltage rectifier contactor 152 (also referred to as TSC) can be added after the voltage rectifier unit 102, and a battery starting contactor 154 (also referred to as BSC) can be added after the battery 104. The specific functions of the two will be explained below.

[0036] For example, in the discharging mode, whether the direct current input into the conversion device 100 is from the voltage rectifier unit 102 or the battery 104 can be controlled by the busbar power control unit 108 by closing the voltage rectifier contactor 152 and opening the battery starting contactor 154 to connect the output of the voltage rectifier unit 102 to the input of the conversion device 100, or by closing the battery starting contactor 154 and opening the voltage rectifier contactor 152 to connect the output of the battery 104 to the input of the conversion device 100.

[0037] In one example, the first DC / DC unit 110 and the second DC / DC unit 120 can adjust the voltage of the direct current passing through by adjusting the duty cycle, and the first voltage is less than the second voltage, and the second voltage is less than the third voltage.

[0038] It can be appreciated that the above examples can be performed individually or in combination, as the case can be.

[0039] It can be seen that, for the conversion device of the present application, the main power circuit of the equipment is composed of two-stage DC / DC, which can realize the conversion of electric energy of different voltages on the aircraft in combination with the power architecture judgment and mode switching logic. For example, in normal working condition, the TRU (i.e. the voltage rectifier unit 102) can provide a 28 V power input, which is converted into a charging power by the first-stage DC / DC (i.e. the first DC / DC unit 110); in the starting condition, the TRU (i.e. the voltage rectifier unit 102) / APU battery (i.e. the battery 104) can be selected to provide a DC power input, which is output as 270 V DC by the two-stage DC / DC (i.e. the first DC / DC unit 110 and the second DC / DC unit 120) to supply power to the SGCU (the starting generator control unit), which further converts the electric energy into excitation and driving of the ASG (the APU starting generator), and the ASG drives the APU (the auxiliary power unit) to start, thereby realizing the function of starting the APU.

[0040] The circuit structure of the conversion device according to one embodiment of the present application in the charging mode and the discharging mode will be explained below with reference to Figure 2 and Figure 3a and Figure 3b respectively. Similar to the time-division multiplexing conversion device 100 shown in Figure 1 , the time-division multiplexing conversion device 100 can include, for example, the first DC / DC unit 110, the second DC / DC unit 120, and the control unit 130. Among them, the switches S1 and S2 are the first switch and the second switch respectively, and their states can be automatically switched by the control unit 130 in the conversion device 100 according to the signals from the BPCU (i.e. the busbar power control unit 108).

[0041] Figure 2 The circuit structure schematic diagram of the time-division multiplexing conversion device according to one embodiment of the present application in the charging mode is shown.

[0042] As shown in Figure 2 , in the charging mode, for example, when the aircraft is in normal power supply mode, at this time the TRU (i.e. the voltage rectifier unit 102) works normally, the BPCU (i.e. the busbar power control unit 108) opens the BSC (i.e. the battery starting contactor 154) and closes the TSC (i.e. the voltage rectifier contactor 152). Thus, the input of the conversion device 100 is 28 V DC from the TRU (i.e. the voltage rectifier unit 102).

[0043] Accordingly, the control unit 130 in the converter 100 receives the BPCU signal from the busbar power control unit 108 and sets the switch to position S1. At this time, the current flowing out of the first DC / DC unit 110 can bypass the second DC / DC unit 120 and flow through switch S1 (i.e., the first switch) to the output filter unit 160. Thus, the converter 100 converts the input 28 V (i.e., the first voltage) DC power into the voltage required for charging the battery 104 (i.e., the second voltage), such as 33 V DC power, through the first stage DC / DC (i.e., the first DC / DC unit 110). After being filtered by the output filter unit 160, the battery 104 is then charged.

[0044] Figure 3a and Figure 3b A schematic diagram of the circuit structure of a time-division multiplexing converter in discharge mode according to an embodiment of the present invention is shown.

[0045] In discharge mode, such as when the aircraft is in APU start-up mode, the control unit 130 first sets the switch to the S2 position, and then determines whether it supports TRU (i.e., transformer rectifier unit 102) to start APU (i.e., auxiliary power unit).

[0046] If the auxiliary power unit is started by the transformer rectifier unit 102, then as follows Figure 3a As shown, the busbar power control unit 108 closes the TSC (i.e., transformer rectifier contactor 152) and opens the BSC (i.e., battery starter contactor 154). Thus, the input to the converter 100 is 28 V DC from the TRU (i.e., transformer rectifier unit 102). At this time, since the switch is in position S2, the current flowing out of the first DC / DC unit 110 can flow to the second DC / DC unit 120 through switch S2 (i.e., the second switch). Thus, the converter 100 converts the 28 V (i.e., the first voltage) DC input from the transformer rectifier unit 102 into the voltage required to start the auxiliary power unit (i.e., the third voltage), such as 270 V DC, through two stages of DC / DC (i.e., the first DC / DC unit 110 and the second DC / DC unit 120). This voltage can then be filtered by the output filter unit 160 and output to the starter generator control unit 106 (or APU starter controller) to power it. Accordingly, the starter generator control unit 106 converts electrical energy into excitation and drive power for the ASG (APU starter generator). After the ASG rotates, it drives the auxiliary power unit to start.

[0047] If starting the auxiliary power unit by the transformer rectifier unit 102 is not supported, then as follows Figure 3bAs shown, the busbar power supply control unit 108 closes the BSC (i.e., the battery starting contactor 154) and opens the TSC (i.e., the transformer rectifier contactor 152). Thus, the input of the conversion device 100 is 28 V DC from the battery 104. At this time, since the switch is in the S2 position, the current flowing out of the first DC / DC unit 110 can flow through the switch S2 (i.e., the second switch) to the second DC / DC unit 120. Thus, the conversion device 100 converts the 28 V (i.e., the first voltage) DC input from the battery 104 into a voltage (i.e., the third voltage) required by the starting auxiliary power unit, such as 270 V DC, through two-stage DC / DC (i.e., the first DC / DC unit 110 and the second DC / DC unit 120), and can be output to the starter generator control unit 106 (or the APU starting controller) after being filtered by the output filter unit 160 to supply power thereto. Accordingly, the starter generator control unit 106 converts the electrical energy into an excitation and driving power source of the ASG (APU starting generator). After the ASG is rotated, the auxiliary power unit is started.

[0048] It can be appreciated that the 28 V, 33 V, 270 V described above with reference to Figures 1 to 3b are only examples, and the conversion device of the present application can be applied to different values of the first voltage, the second voltage, and the third voltage according to actual needs.

[0049] Figure 4 A flowchart illustrating a control method 400 of a conversion device for time-division multiplexing according to an embodiment of the present application is described. The conversion device can include, for example, the first DC / DC unit 110, the second DC / DC unit 120, and the control unit 130, etc. In one embodiment, the control method 400 can be performed by the conversion device 100 for time-division multiplexing described above, and more particularly, the control method 400 can be performed by the control unit 130 in the conversion device 100. Figure 1 A flowchart illustrating a control method 400 of a conversion device for time-division multiplexing according to an embodiment of the present application is described. The conversion device can include, for example, the first DC / DC unit 110, the second DC / DC unit 120, and the control unit 130, etc. In one embodiment, the control method 400 can be performed by the conversion device 100 for time-division multiplexing described above, and more particularly, the control method 400 can be performed by the control unit 130 in the conversion device 100.

[0050] At block 410, the control method 400 can include time-division multiplexing the first DC / DC unit 110 and the second DC / DC unit 120 by the control unit 130 according to whether the conversion device 100 is in a charging mode or a discharging mode.

[0051] Specifically, at block 412, the control method 400 can include, in the charging mode, converting, by the control unit 130, the first voltage DC from the transformer rectifier unit 102 into the second voltage DC by the first DC / DC unit 110 to charge the battery 104.

[0052] At block 414, the control method 400 can include, in the discharge mode, controlling, by the control unit 130, the first DC / DC unit 110 to convert the direct current of the first voltage from the voltage rectifier unit 102 or the battery 104 to direct current of the second voltage, and controlling the second DC / DC unit 120 to convert the direct current of the second voltage from the first DC / DC unit 110 to direct current of the third voltage, to power the starter generator control unit 106.

[0053] In one example, the control method 400 can further include, in the charge mode, connecting, by the control unit 130, the output of the first DC / DC unit 110 to the input of the battery 104 through the first switch SI, and in the discharge mode, connecting, by the control unit 130, the output of the first DC / DC unit 110 to the input of the second DC / DC unit 120 through the second switch S2, such that the direct current from the voltage rectifier unit 102 or the battery 104 goes to the input of the starter generator control unit 106 after passing through both the first DC / DC unit 110 and the second DC / DC unit 120.

[0054] It can be appreciated that the flowchart of the control method 400 shown is merely an example, and each step can be adjusted, modified, and / or added according to actual needs. Figure 4

[0055] Figure 5 A block diagram showing a hardware implementation of a protection system according to one embodiment of the present application is shown. The system shows a general hardware environment in which the present application can be applied according to the exemplary embodiments of the present application. The system can be any machine configured to perform processing and / or computation, which can be, but is not limited to, a workstation, a server, a desktop computer, a laptop computer, a tablet computer, a personal digital assistant (PDA), a smart phone, or any combination thereof. The system described above can be implemented in whole or at least in part by the apparatus or similar apparatus or system.

[0056] The system can include components connected or in communication with the bus 520. For example, the system can include the bus 520, the processor 505, and one or more memories 510, among others.

[0057] ​The processor(s) 505 can be any type of processors, and can include but not limited to general purpose processors and / or dedicated processors (e.g., special purpose chips), intelligent hardware devices (e.g., general purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor(s) 505 can be configured to operate a memory array using a memory controller. In other cases, a memory controller (not shown) can be integrated into the processor(s) 505. The processor(s) 505 can be responsible for managing a bus 520 and general processing, including the execution of software 515 stored on the memory 510. The processor(s) 505 can also be configured to perform various functions related to the control method for time-division multiplexing of a conversion device described herein. For example, the processor(s) 505 can be configured to time-division multiplex a first DC / DC unit and a second DC / DC unit according to whether the conversion device is in a charging mode or a discharging mode, wherein in the charging mode, the first DC / DC unit is controlled to convert direct current of a first voltage from a voltage rectification unit to direct current of a second voltage to charge a battery, and in the discharging mode, the first DC / DC unit is controlled to convert direct current of the first voltage from the voltage rectification unit or the battery to direct current of the second voltage, and the second DC / DC unit is controlled to convert direct current of the second voltage from the first DC / DC unit to direct current of a third voltage to power a starter generator control unit.

[0058] The memory 510 can be any storage device that can implement data storage. The memory 510 can include, but not limited to, a disk drive, an optical storage device, a solid-state memory, a floppy disk, a hard disk, a magnetic tape, or any other magnetic medium, an optical disk or any other optical medium, a ROM (read only memory), a RAM (random access memory), a cache memory, and / or any other memory chip or cartridge, and / or any other medium from which a computer can read data, instructions, and / or code. The memory 510 can store computer-executable software 515 including computer-readable instructions that, when executed, cause the processor to perform various functions described herein. The memory 510 can have various data / instructions / code for implementing various functions described herein related to the design of a conversion device for time-division multiplexing.

[0059] Software 515 can be stored in memory 510, including but not limited to an operating system, one or more applications, drivers, and / or other data and code. Instructions to perform the various functions described herein can be included in one or more of the applications, and the components of the system can be implemented by the processor 505 reading and executing the instructions of the one or more applications. In some cases, the software 515 can be software that is not directly executable by the processor, but that, when executed, causes the computer to perform the various functions described herein related to the control method for a time-multiplexed conversion device.

[0060] From the above embodiments, it can be clearly understood by those skilled in the art that the present disclosure can be implemented by software with necessary hardware, or by hardware, firmware, etc. Based on such understanding, the embodiments of the present disclosure can be partially implemented in software form. The computer software can be stored in a readable storage medium such as a floppy disk, a hard disk, an optical disk, or a flash memory of a computer. The computer software includes a series of instructions to make a computer (for example, a personal computer, a service station, or a network terminal) execute a method according to a corresponding embodiment of the present disclosure or a part thereof.

[0061] The time-multiplexed conversion device and its control method of the present application are described above, which combines the functions of the battery charger and the SPU by the proposed two-stage converter. In other words, the technical solution of the present application can assume the functions of the charger and the SPU under the original architecture, so that the original battery charger and SPU can be replaced by the conversion device of the present application.

[0062] Compared with the prior art, the present application can at least bring the following beneficial effects: (1) based on the design of internal multiplexing switching logic, the conversion device can meet the different power consumption scene functions of the aircraft, realize the simplification of the power supply system architecture and the weight reduction of the aircraft platform; (2) the time-multiplexed multifunctional conversion device and method are first proposed, filling the technical gap.

[0063] Throughout this specification, reference has been made to "one example" or "an example" meaning that a particular described feature, structure, or characteristic is included in at least one example. Therefore, it is possible that a given phrase can refer to more than one example. Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more examples.

[0064] However, those skilled in the relevant art can recognize that the examples can be practiced with one or more of the particular details, or other methods, resources, materials, etc., without one or more of the specific details. In other instances, well-known structures, resources, or operations have not been shown or described in detail to avoid obscuring aspects of the examples.

[0065] While examples and applications have been illustrated and described, it is to be understood that the examples are not limited to the precise configuration and resources described above. Various modifications, changes, and variations apparent to those skilled in the art can be made in the arrangement, operation, and details of the methods and systems disclosed herein without departing from the scope of the examples claimed.

Claims

1. A time-division multiplexing conversion device, characterized in that, The conversion device includes: The first DC / DC unit is connected to the output of the transformer rectifier unit or the battery and is used to convert the first voltage into the second voltage. The second DC / DC unit is connected to the input of the starter-generator control unit and is used to convert the second voltage into a third voltage; The control unit is configured to time-division multiplex the first DC / DC unit and the second DC / DC unit according to whether the converter is in charging mode or discharging mode, wherein In the charging mode, the control unit controls the first DC / DC unit to convert the DC power of the first voltage from the transformer-rectifier unit into the DC power of the second voltage to charge the battery. In the discharge mode, the control unit controls the first DC / DC unit to convert the DC power of the first voltage from the transformer rectifier unit or the battery into the DC power of the second voltage, and controls the second DC / DC unit to convert the DC power of the second voltage from the first DC / DC unit into the DC power of the third voltage, so as to supply power to the starter generator control unit.

2. The conversion device as described in claim 1, characterized in that, The control unit uses a first switch and a second switch to perform time-division multiplexing of the first DC / DC unit and the second DC / DC unit.

3. The conversion device as described in claim 2, characterized in that, The control unit switches the connection between the first switch and the second switch according to the instructions from the busbar power control unit.

4. The conversion device as described in claim 2, characterized in that, In the charging mode, the control unit connects the output of the first DC / DC unit to the input of the battery via the first switch.

5. The conversion device as described in claim 2, characterized in that, In the discharge mode, the control unit connects the output of the first DC / DC unit to the input of the second DC / DC unit via the second switch, so that the DC power from the transformer rectifier unit or the battery passes through both the first DC / DC unit and the second DC / DC unit before going to the input of the starter generator control unit.

6. The conversion device as described in claim 5, characterized in that, Whether the DC power input to the converter comes from the transformer-rectifier unit or the battery is controlled by the busbar power control unit by performing the following operations: Close the transformer rectifier contactor and disconnect the battery start contactor to connect the output of the transformer rectifier unit to the input of the converter; or Close the battery start contactor and disconnect the transformer rectifier contactor to connect the battery output to the input of the conversion device.

7. The conversion device as claimed in claim 1, characterized in that, The conversion device further includes: An input filtering unit is connected between the output of the transformer-rectifier unit or the battery and the input of the first DC / DC unit; and An output filtering unit is connected between the output of the first DC / DC unit or the second DC / DC unit and the input of the starter generator control unit.

8. The conversion device as claimed in claim 1, characterized in that, The first DC / DC unit and the second DC / DC unit adjust the voltage of the DC current passing through them by adjusting the duty cycle, and the first voltage is less than the second voltage, and the second voltage is less than the third voltage.

9. A control method for a time-division multiplexing converter, characterized in that, The conversion device includes a first DC / DC unit, a second DC / DC unit, and a control unit; the method includes: The control unit performs time-division multiplexing of the first DC / DC unit and the second DC / DC unit according to whether the converter is in charging mode or discharging mode, wherein In charging mode, the control unit controls the first DC / DC unit to convert the DC power from the first voltage of the transformer-rectifier unit into a second voltage DC power to charge the battery; and In discharge mode, the control unit controls the first DC / DC unit to convert the DC power of the first voltage from the transformer rectifier unit or the battery into the DC power of the second voltage, and controls the second DC / DC unit to convert the DC power of the second voltage from the first DC / DC unit into the DC power of the third voltage, so as to supply power to the starter generator control unit.

10. The control method as described in claim 9, characterized in that, The method further includes: In the charging mode, the control unit connects the output of the first DC / DC unit to the input of the battery via a first switch; and In the discharge mode, the control unit connects the output of the first DC / DC unit to the input of the second DC / DC unit via a second switch, so that the DC power from the transformer rectifier unit or the battery passes through both the first DC / DC unit and the second DC / DC unit before going to the input of the starter generator control unit.

Images