Series boosted circuit and power supply system

Abstract

The invention provides a series boost circuit and a power supply system, and relates to the technical field of batteries, the series boost circuit comprises a plurality of boost units connected in series, each boost unit comprises a battery pack and an electric control box, and the electric control box amplifies a battery voltage provided by the battery pack; the electric control box also controls the on-off control of the positive output end, the negative output end and the series output end of each boost unit to an external output path, so as to control the boost units of different numbers to be connected in series in different sequences. Therefore, the number and sequence of the boost units connected in series in the series circuit can be flexibly switched according to the actual voltage requirement or the isolation requirement of the fault boost unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a series-connection voltage boosting circuit and a power supply system. BACKGROUND

[0002] At present, in the field of power supply system, such as vehicle-mounted power supply system, electric vertical take-off and landing aircraft power supply system, etc., many manufacturers have developed 800V, 1000V high-voltage power supply system, which generally adopts series connection of direct-current power supply components (batteries, etc.) to improve the voltage output of the power supply system.

[0003] However, for the power supply system composed of series-connected battery groups, the voltage output by the power supply system is relatively fixed, and the flexibility is poor, and when a certain group of series-connected batteries fails, it will cause the power supply system to be directly disconnected and lose current, so that the risk of the power supply system is too high. SUMMARY

[0004] The problem solved by the present application is how to improve the flexibility and reliability of the series-connection voltage boosting circuit.

[0005] To solve the above problems, the present application provides a series-connection voltage boosting circuit and a power supply system.

[0006] In a first aspect, the present application provides a series-connection voltage boosting circuit, comprising: a plurality of voltage boosting units; The plurality of voltage boosting units are connected in series to form a series circuit, each of the voltage boosting units has a positive output end, a negative output end, a series output end and a series input end; The series output end of each of the voltage boosting units in the series circuit is connected to the series input end of the next voltage boosting unit, and the series output end of the last voltage boosting unit is connected to the series input end of the first voltage boosting unit; the positive output end of each of the voltage boosting units is used to be connected to the total positive output end of the series circuit, and the negative output end of each of the voltage boosting units is used to be connected to the total negative output end of the series circuit; The voltage boosting unit comprises a battery group and an electric control box, the electric control box is used to amplify the battery voltage provided by the battery group, and the amplified battery voltage is combined with the voltage input from the series input end and then output to the positive output end, the negative output end and the series output end; The electric control box is also used to control the communication or disconnection of the connection path between the positive output end of each of the voltage boosting units and the total positive output end, control the communication or disconnection of the connection path between the negative output end of each of the voltage boosting units and the total negative output end, and control the communication or disconnection of the connection path between the series output end of each of the voltage boosting units and the series input end of other voltage boosting units.

[0007] Optionally, the electric control box comprises at least: a first switch, a second switch and a third switch. The first switch is arranged in a path connecting the positive output end of the voltage boosting unit and the total positive output end. The second switch is arranged in a path connecting the negative output end of each voltage boosting unit and the total negative output end. The third switch is arranged in a path connecting the series output end of each voltage boosting unit and the series input end of other voltage boosting units.

[0008] Optionally, the electric control box further comprises: A controller for controlling the opening or closing of the first switch, the second switch and the third switch.

[0009] Optionally, the controller for controlling the opening or closing of the first switch, the second switch and the third switch comprises: The controller is configured to control the second switch and the third switch of the first voltage boosting unit in the series circuit to be closed, and the first switch to be opened. The controller is configured to control the first switch of the last voltage boosting unit in the series circuit to be closed, and the second switch and the third switch to be opened. The controller is configured to control the third switch of one or more voltage boosting units between the first voltage boosting unit and the last voltage boosting unit in the series circuit to be closed, and the first switch and the second switch to be opened.

[0010] Optionally, the controller for controlling the opening or closing of the first switch, the second switch and the third switch comprises: The controller is configured to control the first switch, the second switch and the third switch of each voltage boosting unit to be opened or closed according to a preset voltage requirement, so that the number of voltage boosting units connected in series in the series circuit matches the preset voltage requirement.

[0011] Optionally, the controller for controlling the opening or closing of the first switch, the second switch and the third switch comprises: In response to receiving a failure instruction of a target voltage boosting unit, the controller is configured to control the first switch, the second switch and the third switch of the target voltage boosting unit to be opened, and control the first switch, the second switch and the third switch of other voltage boosting units in the series circuit except the target voltage boosting unit to be opened or closed, so that other voltage boosting units in the series circuit except the target voltage boosting unit form a new series circuit.

[0012] Optionally, the controller is configured to control the first switch, the second switch and the third switch corresponding to the other boost units in the series circuit to be open or closed, so that the other boost units in the series circuit form a new series circuit, including: If the target boost unit is the first boost unit in the series circuit, the controller is configured to: control the second switch and the third switch of the next boost unit of the target boost unit in the series circuit to be closed, and the first switch to be open; and control the first switch of the last boost unit in the series circuit to be closed, and the second switch and the third switch to be open; and control the third switch of one or more boost units between the next boost unit of the target boost unit and the last boost unit in the series circuit to be closed, and the first switch and the second switch to be open.

[0013] Optionally, the controller is configured to control the first switch, the second switch and the third switch corresponding to the other boost units in the series circuit to be open or closed, so that the other boost units in the series circuit form a new series circuit, including: If the target boost unit is the last boost unit in the series circuit, the controller is configured to: control the second switch and the third switch of the first boost unit in the series circuit to be closed, and the first switch to be open; and control the first switch of the previous boost unit of the target boost unit in the series circuit to be closed, and the second switch and the third switch to be open; and control the third switch of one or more boost units between the first boost unit and the previous boost unit of the target boost unit in the series circuit to be closed, and the first switch and the second switch to be open.

[0014] Optionally, the controller is configured to control the first switch, the second switch and the third switch corresponding to the other boost units in the series circuit to be open or closed, so that the other boost units in the series circuit form a new series circuit, including: If the target boost unit is any boost unit between the first boost unit and the last boost unit in the series circuit, the controller is configured to: the second switch and the third switch of one or more boost units between the next boost unit and the previous boost unit of the target boost unit in the series connection circuit are controlled to be closed, and the first switch and the second switch are controlled to be opened. the first switch of the previous boost unit of the target boost unit in the series connection circuit is controlled to be closed, and the second switch and the third switch are controlled to be opened; the third switch of one or more boost units between the next boost unit and the previous boost unit of the target boost unit in the series connection circuit are controlled to be closed, and the first switch and the second switch are controlled to be opened.

[0015] Optionally, the battery pack comprises a battery for providing a battery voltage and a battery management module for monitoring and protecting the battery; and / or, the electronic control box further comprises a diode and a transistor, an anode of the diode is connected to a negative pole of the battery pack and a series input of the boost units, a first end of the transistor is connected to a positive pole of the battery pack, a second end of the transistor is connected to a cathode of the diode and forms a first connection point, and the first connection point is connected to a positive output and a series output of the boost units.

[0016] In a second aspect, the present application provides a power supply system comprising the series connection boost circuit according to any one of the first aspect.

[0017] The series-connection voltage-boosting circuit and power supply system have the following advantages: the series-connection voltage-boosting circuit comprises a plurality of voltage-boosting units connected in series to form a series circuit, each voltage-boosting unit has a positive output end, a negative output end, a series output end and a series input end, the series output end of each voltage-boosting unit is connected to the series input end of the next voltage-boosting unit in the series circuit, the series output end of the last voltage-boosting unit is connected to the series input end of the first voltage-boosting unit, the positive output end of each voltage-boosting unit is connected to a total positive output end of the series circuit, and the negative output end of each voltage-boosting unit is connected to a total negative output end of the series circuit, thereby forming a series connection of the plurality of voltage-boosting units. The voltage-boosting unit comprises a battery pack and an electric control box, the electric control box is used to amplify the battery voltage provided by the battery pack, combine the amplified battery voltage with the voltage input from the series input end, and output the combined voltage to the positive output end and the series output end, each voltage-boosting unit combines the amplified battery voltage with the output voltage of the previous voltage-boosting unit connected in series and outputs the combined voltage, so as to increase the output voltage. The electric control box is also used to control the connection or disconnection of the positive output end of each voltage-boosting unit to the total positive output end, the connection or disconnection of the negative output end of each voltage-boosting unit to the total negative output end, and the connection or disconnection of the series output end of each voltage-boosting unit to the series input end of the other voltage-boosting units, so as to control the series connection of different numbers of voltage-boosting units in different orders, thereby flexibly switching the number and order of the series-connection voltage-boosting units in the series circuit according to the actual voltage demand or the isolation demand of the faulty voltage-boosting units. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure schematic diagram of a series-connection voltage-boosting circuit according to an embodiment of the present application; Figure 2 A structure schematic diagram of a series-connection voltage-boosting circuit according to another embodiment of the present application; Figure 3 A circuit schematic diagram of an electric control box according to an embodiment of the present application; Figure 4 A circuit schematic diagram of a series-connection voltage-boosting circuit according to an embodiment of the present application; Figure 5 A structure schematic diagram of a battery pack according to an embodiment of the present application. DETAILED DESCRIPTION

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0021] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0022] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] To address the problems existing in the aforementioned related technologies, this embodiment provides a series boost circuit and power supply system.

[0024] like Figure 1 As shown in the figure, an embodiment of the present invention provides a series boost circuit, including: a plurality of boost units 110.

[0025] Multiple boost units 110 are connected in series to form a series circuit. Each boost unit 110 has a positive output terminal 111+, a negative output terminal 111-, a series output terminal 112+, and a series input terminal 112-.

[0026] In the series circuit, the series output terminal 112+ of each boost unit 110 is connected to the series input terminal 112- of the next boost unit 110, and the series output terminal 112+ of the last boost unit 110 connected in series is connected to the series input terminal 112- of the first boost unit 110; the positive output terminal 111+ of each boost unit 110 is used to connect to the total positive output terminal 120+ of the series circuit, and the negative output terminal 111- of each boost unit 110 is used to connect to the total negative output terminal 120- of the series circuit.

[0027] The boost unit 110 includes a battery pack 113 and an electronic control box 114. The electronic control box 114 is used to amplify the battery voltage provided by the battery pack 113, and combine the amplified battery voltage with the voltage input at the series input terminal 112- and output it to the positive output terminal 111+ and the series output terminal 112+.

[0028] The control box 114 is also used to control the connection or disconnection of the positive output terminal 111+ of each boost unit 110 with the total positive output terminal 120+, and to control the connection or disconnection of the negative output terminal 111- of each boost unit 110 with the total negative output terminal 120-, and to control the connection or disconnection of the series output terminal 112+ of each boost unit 110 with the series input terminal 112- of other boost units 110.

[0029] In some embodiments, such as Figure 2 The diagram shows four boost units 110 connected in series. For easy distinction, the four boost units 110 are referred to as Boost Unit 1, Boost Unit 2, Boost Unit 3, and Boost Unit 4. The positive output terminal 111+ of Boost Unit 1, Boost Unit 2, Boost Unit 3, and Boost Unit 4 is connected to the total positive output terminal 120+, and the negative output terminal 111- is connected to the total negative output terminal 120-. The series output terminal 112+ of Boost Unit 1 is connected to the series input terminal 112- of Boost Unit 2, the series output terminal 112+ of Boost Unit 2 is connected to the series input terminal 112- of Boost Unit 3, the series output terminal 112+ of Boost Unit 3 is connected to the series input terminal 112- of Boost Unit 4, and the series output terminal 112+ of Boost Unit 4 is connected to the series input terminal 112- of Boost Unit 1.

[0030] For each boost unit 110, the positive and negative terminals of the battery pack 113 of the boost unit 110 are connected to the input terminal of the control box 114. The control box 114 amplifies the battery voltage provided by the battery pack 113. The input terminal of the control box 114 is also connected to the series input terminal 112- to receive the voltage output by the previous boost unit 110. The control box 114 combines the voltage output by the previous boost unit 110 input at the series input terminal 112- and the amplified battery voltage and outputs them to the positive output terminal 111+, the negative output terminal 111- and the series output terminal 112+ of the boost unit 110.

[0031] In addition, the control box 114 can control the on / off of the positive output terminal 111+, negative output terminal 111- and series output terminal 112+ of each boost unit 110 according to different needs, thereby switching the number and series sequence of boost units actually connected in series in the series circuit.

[0032] In this embodiment, the series boost circuit includes multiple boost units connected in series to form a series circuit. Each boost unit has a positive output terminal, a negative output terminal, a series output terminal, and a series input terminal. The series output terminal of each boost unit in the series circuit is connected to the series input terminal of the next boost unit, and the series output terminal of the last boost unit is connected to the series input terminal of the first boost unit. The positive output terminal of each boost unit is used to connect to the total positive output terminal of the series circuit, and the negative output terminal of each boost unit is used to connect to the total negative output terminal of the series circuit, thereby forming a series connection of multiple boost units. The boost unit includes a battery pack and an electronic control box. The electronic control box is used to amplify the battery voltage provided by the battery pack and combine the amplified battery voltage with the voltage input at the series input terminal before outputting it to the positive output terminal and the series output terminal. Each boost unit combines the amplified battery voltage with the output voltage of the previous boost unit connected in series before outputting it to increase the output voltage. The control box is also used to control the connection or disconnection of the positive output terminal of each boost unit with the total positive output terminal, the connection or disconnection of the negative output terminal of each boost unit with the total negative output terminal, and the connection or disconnection of the series output terminal of each boost unit with the series input terminal of other boost units. By controlling the on / off of the output paths of the positive output terminal, negative output terminal and series output terminal of the boost unit through the control box, different numbers of boost units can be connected in series in different orders. Thus, the number and order of boost units connected in series in the series circuit can be flexibly switched according to the actual voltage requirements or the isolation requirements of the faulty boost unit.

[0033] Optionally, such as Figure 3As shown, the electrical control box 114 includes at least a first switching switch KM1, a second switching switch KM2, and a third switching switch KM3. The first switching switch KM1 is disposed in the path connecting the positive output terminal 111+ of the boost unit 110 to the total positive output terminal 120+. The second switching switch KM2 is disposed in the path connecting the negative output terminal 111- of each boost unit 110 to the total negative output terminal 120-. The third switching switch KM3 is disposed in the path connecting the series output terminal 112+ of each boost unit 110 to the series input terminal 112- of other boost units 110.

[0034] In addition, the electronic control box 114 also includes a diode D1 and a transistor T1; the anode of the diode D1 is used to connect the negative terminal of the battery pack 113 and the series input terminal 112- of the boost unit 110, the first terminal of the transistor T1 is connected to the positive terminal of the battery pack, and the second terminal of the transistor T1 is connected to the cathode of the diode D1 to form a first connection point, which is used to connect the positive output terminal 111+ and the series output terminal 112+ of the boost unit 110.

[0035] In this circuit, diode D1 is used to prevent reverse current flow, and transistor T1 is used to amplify the battery voltage to achieve the effect of boosting the voltage. Furthermore, by connecting the first connection point, the output voltage of other boost units 110 in the series circuit is combined with the amplified battery voltage in this boost unit 110, which further increases the output voltage of this boost unit 110. In this way, the output voltage of the last boost unit 110 in the series circuit is significantly improved.

[0036] In addition, the electrical control box 114 also includes a fuse FU, which is connected to the first connection point to effectively cut off the circuit in case of overcurrent and protect the circuit, thereby improving the safety and reliability of the circuit.

[0037] In this optional embodiment, by controlling the closing or opening of the first switching switch, the second switching switch and the third switching switch corresponding to each boost unit 110, the path for outputting voltage from the positive output terminal 111+, the negative output terminal 111- and the series input terminal 112- of each boost unit 110 is controlled to open or close, thereby realizing the series connection of boost units 110 with different numbers and different orders in the series circuit.

[0038] Optionally, the series boost circuit of this embodiment further includes a controller, which controls the opening or closing of the first switching switch, the second switching switch, and the third switching switch. In some embodiments, the controller may be a control chip or a control circuit with computing power.

[0039] In some embodiments, the controller can open or close the first, second, and third switching switches corresponding to each boost unit according to a preset voltage requirement, so that the number of boost units connected in series in the series circuit matches the preset voltage requirement. For example, when the preset voltage requirement is 1000V, and each boost unit can provide 100V, then the number of boost units connected in series in the series circuit is 10.

[0040] It should be noted that when the series boost circuit discharges externally, any boost unit can be used as the first boost unit to achieve autonomous voltage switching, depending on the operating conditions and system voltage requirements. Furthermore, when the series boost circuit discharges externally, the voltage level boosted by the series boost circuit can be N-1 times that of the boost units, where N is the number of boost units.

[0041] In other embodiments, the controller may also respond to a received fault command of the target boost unit by controlling the first, second, and third switching switches of the target boost unit to be disconnected, and controlling the first, second, and third switching switches of the other boost units in the series circuit to be disconnected or closed, so that the other boost units in the series circuit except the target boost unit form a new series circuit.

[0042] If a boost unit in a series circuit malfunctions, for example, if the battery pack malfunctions, the battery pack can send a fault command to the controller. Based on the received fault command, the controller will disconnect the first, second, and third switching switches of the target boost unit to isolate it from the series circuit. The controller will also disconnect or close the first, second, and third switching switches of the other boost units in the series circuit, excluding the target boost unit, to form a new series circuit. In this way, a fault in one boost unit in the series circuit will not affect the operation of the entire series boost circuit.

[0043] In this optional embodiment, the controller opens or closes the first, second, and third switching switches to achieve switching control of the states of the first, second, and third switching switches under different operating conditions, voltage requirements, and fault isolation requirements.

[0044] Optionally, for multiple boost units 110 connected in series in a series circuit, the controller is used to control the first switching switch, the second switching switch, and the third switching switch to open or close, including: The controller is used to control the second and third switching switches of the first boost unit 110 in the series circuit to close, and the first switching switch to open; and to control the first switching switch of the last boost unit 110 in the series circuit to close, and the second and third switching switches to open; and to control the third switching switch of one or more boost units 110 between the first boost unit 110 and the last boost unit 110 in the series circuit to close, and the first and second switching switches to open.

[0045] In some embodiments, such as Figure 4 As shown, in the series circuit, boost units 1, 2, 3, and 4, the first switching switch KM11 is located in the path connecting the positive output terminal 111+ of boost unit 1 to the total positive output terminal 120+; the second switching switch KM12 is located in the path connecting the negative output terminal 111- of each boost unit 110 to the total negative output terminal 120-; and the third switching switch KM13 is located in the path connecting the series output terminal 112+ of each boost unit 110 to the series input terminal 112- of other boost units 110. In the circuit; for boost unit two, boost unit three and boost unit four, the first switching switch KM21, the first switching switch KM31, the first switching switch KM41, the second switching switch KM22, the second switching switch KM32, the second switching switch KM42, the third switching switch KM23, the third switching switch KM33, and the third switching switch KM43 have the same connection method as the first switching switch KM11, the second switching switch KM12, and the third switching switch KM13 of boost unit one, and will not be described one by one in this embodiment.

[0046] The aforementioned boost unit 1, boost unit 2, boost unit 3, and boost unit 4 can be connected in series in four different sequences. The state control of the first, second, and third switching switches for each boost unit in each sequence is as follows: In some embodiments, the second switching switch KM12 and the third switching switch KM13 corresponding to boost unit one can be controlled to close, the third switching switch KM23 corresponding to boost unit two, the third switching switch KM33 corresponding to boost unit three, and the first switching switch KM41 corresponding to boost unit four can be controlled to close, and the first switching switch KM11 corresponding to boost unit one can be controlled to open, the first switching switch KM21 and the second switching switch KM22 corresponding to boost unit two can be opened, the first switching switch KM31 and the second switching switch KM32 corresponding to boost unit three can be opened, and the second switching switch KM42 and the third switching switch KM43 corresponding to boost unit four can be opened; thereby, a series boost circuit one is formed in which boost unit one, boost unit two, boost unit three and boost unit four are connected in series in sequence. At this time, boost unit one is the first boost unit, boost unit four is the last boost unit, and boost unit two and boost unit three are the two middle boost units.

[0047] In other embodiments, the second switching switch KM22 and the third switching switch KM23 corresponding to boost unit 2 can be controlled to close, the third switching switch KM33 corresponding to boost unit 3 can be closed, the third switching switch KM43 corresponding to boost unit 4 can be closed, and the first switching switch KM11 corresponding to boost unit 1 can be closed. The first switching switch KM21 corresponding to boost unit 2 can be controlled to open, the first switching switch KM31 and the second switching switch KM32 corresponding to boost unit 3 can be opened, the first switching switch KM41 and the second switching switch KM42 corresponding to boost unit 4 can be opened, and the second switching switch KM12 and the third switching switch KM13 corresponding to boost unit 1 can be opened. Thus, a series boost circuit 2 is formed, in which boost unit 2, boost unit 3, boost unit 4, and boost unit 1 are connected in series in sequence. In this case, boost unit 2 is the first boost unit, boost unit 1 is the last boost unit, and boost unit 3 and boost unit 4 are the two intermediate boost units.

[0048] In some embodiments, the second switching switch KM32 and the third switching switch KM33 corresponding to boost unit three can be closed, the third switching switch KM43 corresponding to boost unit four can be closed, the third switching switch KM13 corresponding to boost unit one can be closed, and the first switching switch KM21 corresponding to boost unit two can be closed. The first switching switch KM31 corresponding to boost unit three can be opened, the first switching switch KM41 and the second switching switch KM42 corresponding to boost unit four can be opened, the first switching switch KM11 and the second switching switch KM12 corresponding to boost unit one can be opened, and the second switching switch KM22 and the third switching switch KM23 corresponding to boost unit two can be opened. Thus, a second series boost circuit is formed, consisting of boost unit three, boost unit four, boost unit one, and boost unit two connected in series in that order. In this case, boost unit three is the first boost unit, boost unit two is the last boost unit, and boost unit four and boost unit one are the two intermediate boost units.

[0049] In some embodiments, the second switching switch KM42 and the third switching switch KM43 corresponding to boost unit four can be controlled to close, the third switching switch KM13 corresponding to boost unit one can close, the third switching switch KM23 corresponding to boost unit two can close, and the first switching switch KM31 corresponding to boost unit three can close. The first switching switch KM41 corresponding to boost unit four can be controlled to open, the first switching switch KM11 and the second switching switch KM12 corresponding to boost unit one can open, the first switching switch KM21 and the second switching switch KM22 corresponding to boost unit two can open, and the second switching switch KM32 and the third switching switch KM33 corresponding to boost unit three can open. Thus, a second series boost circuit is formed, consisting of boost unit four, boost unit one, boost unit two, and boost unit three connected in series in sequence. In this case, boost unit four is the first boost unit, boost unit three is the last boost unit, and boost unit one and boost unit two are the two intermediate boost units.

[0050] The above describes how the series connection order of multiple boost units 110 in the series circuit is switched by controlling the state of the first switching switch, the second switching switch, and the third switching switch corresponding to each boost unit 110. The following describes the switching of the number of boost units 110 connected in series in the series circuit.

[0051] Optionally, for a target boost unit that has failed, it is necessary to isolate the target boost unit from the series circuit and form a new series circuit. Compared with the previous series circuit, the number of boost units 110 in the new series circuit is reduced. The state control of the first switching switch, the second switching switch and the third switching switch corresponding to each boost unit 110 is described below according to the different positions of the target boost unit in the series circuit.

[0052] In some embodiments, if the target boost unit is the first boost unit in a series circuit, the controller is configured to: The first, second, and third switching switches of the target boost unit are all disconnected; The second and third switching switches of the next boost unit in the target boost unit in the series circuit are closed, and the first switching switch is open; and the first switching switch of the last boost unit 110 in the series circuit is closed, and the second and third switching switches are open; and the third switching switch of one or more boost units 110 between the next boost unit of the target boost unit and the last boost unit 110 in the series circuit is closed, and the first and second switching switches are open.

[0053] by Figure 4 For example, if boost unit one fails (i.e., boost unit one is the target boost unit, boost unit two is the next boost unit, and boost unit four is the last boost unit), then the first switching switch KM11, the second switching switch KM12, and the third switching switch KM13 controlling boost unit one are all open; the second switching switch KM22 and the third switching switch KM23 controlling boost unit two are closed, and the first switching switch KM21 is open; the third switching switch KM33 controlling boost unit three is closed, and the first switching switch KM31 and the second switching switch KM32 are open; and the first switching switch KM41 controlling boost unit four is closed, and the second switching switch KM42 and the third switching switch KM43 are open. Thus, after isolating the faulty boost unit one, boost units two, three, and four are connected in series to form a new series circuit.

[0054] In other embodiments, if the target boost unit is the last boost unit 110 in the series circuit, the controller is configured to: The first, second, and third switching switches of the target boost unit are all disconnected; The second and third switching switches of the first boost unit 110 in the series circuit are closed, and the first switching switch is open; and the first switching switch of the previous boost unit 110 of the target boost unit in the series circuit is closed, and the second and third switching switches are open; and the third switching switch of one or more boost units between the first boost unit 110 and the previous boost unit 110 of the target boost unit in the series circuit is closed, and the first and second switching switches are open.

[0055] by Figure 4For example, if boost unit four fails (i.e., boost unit four is the target boost unit, the first boost unit in the series circuit is boost unit one, and the boost unit preceding the target boost unit is boost unit three), then the first switching switch KM41, the second switching switch KM42, and the third switching switch KM43 controlling boost unit four are all open; the second switching switch KM12 and the third switching switch KM13 controlling boost unit one are closed, and the first switching switch KM11 is open; the third switching switch KM23 controlling boost unit two is closed, and the first switching switch KM21 and the second switching switch KM22 are open; and the first switching switch KM31 controlling boost unit three is closed, and the second switching switch KM32 and the third switching switch KM33 are open. Thus, after isolating the faulty boost unit four, a new series circuit is formed by connecting boost units one, two, and three in series.

[0056] In some embodiments, if the target boost unit is any one of the boost units between the first boost unit 110 and the last boost unit 110 in the series circuit, the controller is configured to: The second and third switching switches of the next boost unit 110 of the target boost unit in the series circuit are closed, and the first switching switch is open; and the first switching switch of the previous boost unit of the target boost unit in the series circuit is closed, and the second and third switching switches are open; and the third switching switch of one or more boost units 110 between the next boost unit 110 and the previous boost unit 110 of the target boost unit in the series circuit is closed, and the first and second switching switches are open.

[0057] by Figure 4 For example, if boost unit two malfunctions, i.e., boost unit two is the target boost unit, the first boost unit in the series circuit is boost unit three (the next boost unit after the target boost unit), the last boost unit is boost unit one (the previous boost unit of the target boost unit), and the intermediate boost unit between the first and last boost units is boost unit four, then the first switching switch KM21, the second switching switch KM22, and the third switching switch KM23 controlling boost unit two are all open, and the second switching switch KM32 and the third switching switch KM33 controlling boost unit three are closed, and the first switching switch KM31 is open, and the third switching switch KM43 controlling boost unit four is closed, and the first switching switch KM41 and the second switching switch KM42 are open, and the first switching switch KM11 controlling boost unit one is closed, and the second switching switch KM12 and the third switching switch KM13 are open. Therefore, after the second boost unit that isolates the fault, a new series circuit is formed by connecting the third boost unit, the fourth boost unit, and the first boost unit in series.

[0058] The above is an exemplary description of how, when the target boost unit among multiple boost units fails, the target boost unit is isolated by controlling the state of the first, second, and third switching switches of each boost unit, and the other boost units besides the target boost unit are connected in series to form a new series circuit.

[0059] Optionally, when the system voltage demand is not high, by controlling the state of the first, second, and third switching switches of each boost unit, a certain boost unit can be isolated, and then the other boost units can be connected in series to form a new series circuit, so as to reduce the total output voltage of the series boost circuit.

[0060] It should be noted that for systems with low voltage requirements, isolation of a single boost unit is used to reduce the number of boost units connected in series. The state control method for the first, second, and third switching switches of each boost unit is the same as the control method for isolating a faulty boost unit. The control method for isolating a faulty boost unit described above can be referred to, and will not be repeated in this embodiment.

[0061] Optionally, such as Figure 5 As shown, the battery pack 113 includes a battery 113-1 and a battery management module 113-2. The battery 113-1 is used to provide battery voltage, and the battery management module 113-2 is used to monitor and protect the battery. In some embodiments, when the battery 113-1 fails, the battery management module 113-2 can send a fault command to the controller.

[0062] It should be noted that the first, second, and third switching switches in this application are DC contactors or switching devices with control functions (such as MOS, IGBT, etc.) to achieve rapid and autonomous switching of the circuit.

[0063] The transistor in this application is a three-terminal transistor, with its three terminals being a control terminal, a first terminal, and a second terminal. The transistor can be a bipolar transistor (BPT) or a field-effect transistor (FET), etc. For example, when the transistor is a BPT, its control terminal is the base of the BPT, the first terminal can be the collector or emitter of the BPT, and the corresponding second terminal can be the emitter or collector of the BPT; when the transistor is a FET, its control terminal is the gate of the FET, the first terminal can be the drain or source of the FET, and the corresponding second terminal can be the source or drain of the FET.

[0064] This invention also provides a power supply system, including the series boost circuit as described in the above embodiments. The specific implementation of the system can be found in the above description, and will not be repeated here.

[0065] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A series boost circuit, characterized in that, include: Multiple boost units; The plurality of boost units are connected in series to form a series circuit, and each boost unit has a positive output terminal, a negative output terminal, a series output terminal and a series input terminal; In the series circuit, the series output terminal of each boost unit is connected to the series input terminal of the next boost unit, and the series output terminal of the last boost unit is connected to the series input terminal of the first boost unit; the positive output terminal of each boost unit is used to connect to the total positive output terminal of the series circuit, and the negative output terminal of each boost unit is used to connect to the total negative output terminal of the series circuit. The boost unit includes a battery pack and an electronic control box. The electronic control box is used to amplify the battery voltage provided by the battery pack, and combine the amplified battery voltage with the voltage input at the series input terminal and output it to the positive output terminal, the negative output terminal and the series output terminal. The control box is also used to control the connection or disconnection of the positive output terminal of each boost unit with the total positive output terminal, and to control the connection or disconnection of the negative output terminal of each boost unit with the total negative output terminal, and to control the connection or disconnection of the series output terminal of each boost unit with the series input terminal of other boost units, so as to switch the number and order of boost units connected in series in the series circuit.

2. The series boost circuit according to claim 1, characterized in that, The electrical control box includes at least: a first switching switch, a second switching switch, and a third switching switch; The first switching switch is located in the path connecting the positive output terminal of the boost unit and the total positive output terminal; The second switching switch is located in the path connecting the negative output terminal of each of the boost units to the total negative output terminal; The third switching switch is located in the path connecting the series output terminal of each boost unit to the series input terminal of other boost units.

3. The series boost circuit according to claim 2, characterized in that, Also includes: The controller is used to control the opening or closing of the first switch, the second switch and the third switch.

4. The series boost circuit according to claim 3, characterized in that, The controller is used to control the first, second, and third switching switches to open or close, including: The controller is used to control the second and third switching switches of the first boost unit in the series circuit to close, and the first switching switch to open. In addition, the controller is used to control the first switching switch of the last boost unit in the series circuit to close, and the second switching switch and the third switching switch to open; Furthermore, the controller is used to control the closing of a third switching switch of one or more boost units between the first boost unit and the last boost unit in the series circuit, while the first switching switch and the second switching switch are open.

5. The series boost circuit according to claim 3, characterized in that, The controller is used to control the first, second, and third switching switches to open or close, including: The controller is used to control the first switching switch, the second switching switch, and the third switching switch corresponding to each of the boost units to open or close according to the preset voltage requirements, so that the number of boost units connected in series in the series circuit matches the preset voltage requirements.

6. The series boost circuit according to claim 3, characterized in that, The controller is used to control the first, second, and third switching switches to open or close, including: In response to a received fault command for the target boost unit, the controller controls the first, second, and third switching switches of the target boost unit to be disconnected, and controls the first, second, and third switching switches of the other boost units in the series circuit (excluding the target boost unit) to be disconnected or closed, so that the other boost units in the series circuit (excluding the target boost unit) form a new series circuit.

7. The series boost circuit according to claim 6, characterized in that, The controller is used to control the opening and closing of the first, second, and third switching switches corresponding to the other boost units in the series circuit besides the target boost unit, so that the other boost units in the series circuit besides the target boost unit form a new series circuit, including: If the target boost unit is the first boost unit in the series circuit, then the controller is used to: The second and third switching switches of the next boost unit of the target boost unit in the series circuit are closed, and the first switching switch is open; In addition, the first switching switch of the last boost unit in the series circuit is closed, and the second and third switching switches are open; In addition, the third switching switch of one or more boost units between the next boost unit and the last boost unit in the series circuit is closed, while the first switching switch and the second switching switch are open.

8. The series boost circuit according to claim 6, characterized in that, The controller is used to control the opening and closing of the first, second, and third switching switches corresponding to the other boost units in the series circuit besides the target boost unit, so that the other boost units in the series circuit besides the target boost unit form a new series circuit, including: If the target boost unit is the last boost unit in the series circuit, then the controller is used to: The second and third switching switches of the first boost unit in the series circuit are closed, and the first switching switch is open; In addition, the first switching switch of the previous boost unit of the target boost unit in the series circuit is closed, and the second and third switching switches are open; In addition, the third switching switch of one or more boost units between the first boost unit and the previous boost unit of the target boost unit in the series circuit is closed, and the first switching switch and the second switching switch are open.

9. The series boost circuit according to claim 6, characterized in that, The controller is used to control the opening and closing of the first, second, and third switching switches corresponding to the other boost units in the series circuit besides the target boost unit, so that the other boost units in the series circuit besides the target boost unit form a new series circuit, including: If the target boost unit is any boost unit between the first and last boost units in the series circuit, the controller is configured to: The second and third switching switches of the next boost unit of the target boost unit in the series circuit are closed, and the first switching switch is open; In addition, the first switching switch of the previous boost unit of the target boost unit in the series circuit is closed, and the second and third switching switches are open; In addition, the third switching switch of one or more boost units between the next boost unit and the previous boost unit of the target boost unit in the series circuit is closed, and the first switching switch and the second switching switch are open.

10. The series boost circuit according to any one of claims 1 to 9, characterized in that, The battery pack includes a battery and a battery management module. The battery is used to provide battery voltage, and the battery management module is used to monitor and protect the battery. And / or, The electronic control box further includes a diode and a transistor; the anode of the diode is used to connect the negative terminal of the battery pack and the series input terminal of the boost unit; the first terminal of the transistor is connected to the positive terminal of the battery pack; the second terminal of the transistor is connected to the cathode of the diode to form a first connection point; the first connection point is used to connect the positive output terminal and the series output terminal of the boost unit.

11. A power supply system, characterized in that, Includes the series boost circuit as described in any one of claims 1 to 10.

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