Solid-state circuit breaker, control method for solid-state circuit breaker, controller, and storage medium

Abstract

The present disclosure provides a solid-state circuit breaker, a control method for a solid-state circuit breaker, a controller, and a storage medium, relating to the technical field of electrical apparatuses. On the basis of the structure of an existing solid-state circuit breaker, a pre-charging unit is additionally arranged, and the pre-charging unit comprises: a current limiting sub-unit and an auxiliary switch sub-unit. During turn-on of the solid-state circuit breaker, the pre-charging unit starts to work, and controls on-off of the auxiliary switch sub-unit on the basis of an input current and / or an output voltage of the solid-state circuit breaker, so that after the auxiliary switch sub-unit is in an on-off state, the input current of the solid-state circuit breaker is limited by means of the current limiting sub-unit, and after the solid-state circuit breaker is turned on, a voltage difference between two ends of a main switch unit is small, and the main switch unit has small loss. The problem of large power consumption of a main switch unit caused by a large current flow and a large input-output voltage difference of the main switch unit when a solid-state circuit breaker is closed is solved, and the model selection difficulty of a switch power electronic device in the solid-state circuit breaker is reduced.

Description

Solid-state circuit breaker, control method for solid-state circuit breaker, controller and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 2023114361803 filed with the Chinese Patent Office on October 31, 2023, entitled “Solid-state circuit breaker, control method for solid-state circuit breaker, controller and storage medium,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the technical field of electrical equipment, and in particular to a solid-state circuit breaker, a control method for the solid-state circuit breaker, a controller, and a storage medium. Background Art

[0004] Solid-state circuit breakers use power electronic devices as their primary disconnect switches to control circuit interruption. Compared to traditional mechanical circuit breakers, solid-state circuit breakers offer advantages such as the absence of arc extinguishing and rapid disconnection, making them a novel power distribution and protection device. Typically, during the startup phase of a solid-state circuit breaker, since the output terminals of the breaker may be connected to loads such as large capacitors, directly activating the main power electronic switch within the breaker can result in a large inrush current, potentially affecting the stability of the input bus voltage and even damaging the power electronic components within the breaker.

[0005] In the prior art, to address the issue of large inrush currents during the startup phase of solid-state circuit breakers, the main switch power electronic devices in the solid-state circuit breaker are generally operated in a linear amplification region, using a lower drive level to limit the output current of the power electronic devices, thereby ensuring the safety of the power electronic devices and preventing significant fluctuations in the bus voltage.

[0006] However, when the main switch power electronic device in the solid-state circuit breaker operates in the linear working area, the main switch power electronic device is subjected to a large input-output voltage difference while passing a large current, resulting in a large power consumption. Ordinary power electronic devices will be damaged due to severe heat, which in turn causes problems such as difficulty in selecting switching power electronic devices.

[0007] Summary of the Invention

[0008] The purpose of the present disclosure is to provide a solid-state circuit breaker, a control method for a solid-state circuit breaker, a controller and a storage medium to address the deficiencies in the prior art, so as to solve the technical problems existing in the prior art.

[0009] To achieve the above objectives, the technical solutions adopted in the embodiments of the present disclosure are as follows:

[0010] In a first aspect, an embodiment of the present disclosure provides a solid-state circuit breaker, comprising: a main switch unit and a pre-charge unit, wherein the main switch unit and the pre-charge unit are connected in parallel or in series;

[0011] The pre-charge unit includes: a current limiting sub-unit and an auxiliary switch sub-unit;

[0012] The current limiting subunit and the auxiliary switch subunit are connected in parallel or in series;

[0013] The auxiliary switch sub-unit is configured to switch on and off according to the input current and / or output voltage of the solid-state circuit breaker, and the current limiting sub-unit is configured to limit the input current.

[0014] Optionally, the input end of the current limiting subunit is connected to the input end of the main switch unit, and the output end of the current limiting subunit is connected to the input end of the auxiliary switch subunit;

[0015] The output end of the auxiliary switch subunit is connected to the output end of the main switch unit.

[0016] Optionally, the input end of the current limiting subunit is connected to the input end of the auxiliary switch subunit and is configured to receive input current;

[0017] The output end of the current limiting sub-unit and the output end of the auxiliary switch sub-unit are connected to the input end of the main switch unit.

[0018] In a second aspect, an embodiment of the present disclosure further provides a control method for a solid-state circuit breaker, which is used to control the solid-state circuit breaker provided in the first aspect. The method includes:

[0019] Determining a control mode of the solid-state circuit breaker, wherein the control mode includes: a one-stage control mode or a multi-stage control mode;

[0020] If the control mode is a one-stage control mode, the on and off of the auxiliary switch subunit in the solid-state circuit breaker is controlled according to the input current and / or output voltage of the solid-state circuit breaker;

[0021] If the control mode is a multi-stage control mode, the on and off of the auxiliary switch sub-unit in the solid-state circuit breaker and the driving level of the main switch unit are controlled according to the input current and / or output voltage of the solid-state circuit breaker and the current threshold and voltage threshold corresponding to the multi-stage control mode.

[0022] Optionally, if the control mode is a one-stage control mode, controlling the on and off of the auxiliary switch subunit in the solid-state circuit breaker according to the input current and / or output voltage of the solid-state circuit breaker includes:

[0023] If the change state of the input current of the solid-state circuit breaker is no longer decreasing, and / or the change state of the output voltage of the solid-state circuit breaker is no longer increasing, the auxiliary switch sub-unit is controlled to enter the target on-off state; wherein, if the auxiliary switch sub-unit is connected in series with the current limiting sub-unit, the target on-off state is off; if the auxiliary switch sub-unit is connected in parallel with the current limiting sub-unit, the target on-off state is on.

[0024] Optionally, if the control mode is a multi-stage control mode, controlling the on / off of the auxiliary switch subunit and the driving level of the main switch unit in the solid-state circuit breaker according to the input current and / or output voltage of the solid-state circuit breaker and the current threshold and voltage threshold corresponding to the multi-stage control mode includes:

[0025] Determining the number of stages corresponding to the multi-stage control mode;

[0026] Determining, according to the number of stages, a plurality of current thresholds and a plurality of voltage thresholds corresponding to the multi-stage control mode;

[0027] The on / off of the auxiliary switch subunit and the driving level of the main switch unit in the solid-state circuit breaker are controlled according to the input current and / or output voltage of the solid-state circuit breaker, the multiple current thresholds, and the multiple voltage thresholds.

[0028] Optionally, controlling the on / off of the auxiliary switch subunit and the driving level of the main switch unit in the solid-state circuit breaker according to the input current and / or output voltage of the solid-state circuit breaker, the multiple current thresholds, and the multiple voltage thresholds includes:

[0029] If the input current of the solid-state circuit breaker reaches a first current threshold, and / or the output voltage of the solid-state circuit breaker reaches a first voltage threshold, the auxiliary switch sub-unit is controlled to enter the on-off state corresponding to the first current threshold and / or the first voltage threshold, and the driving level corresponding to the first current threshold and / or the first voltage threshold is input to the main switch unit, wherein the first current threshold is any one of the multiple current thresholds, and the first voltage threshold is any one of the multiple voltage thresholds.

[0030] Optionally, the multi-stage control mode includes a two-stage control mode or a three-stage control mode.

[0031] In a third aspect, an embodiment of the present disclosure provides a controller comprising: a processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor. When the controller is running, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of the method provided in the second aspect.

[0032] In a fourth aspect, an embodiment of the present disclosure provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method provided in the second aspect are executed.

[0033] The beneficial effects of the present disclosure are:

[0034] The disclosed embodiments provide a solid-state circuit breaker, a control method for the solid-state circuit breaker, a controller and a storage medium. Based on the structure of the existing solid-state circuit breaker, a pre-charging unit is added, and the pre-charging unit includes: a current limiting sub-unit and an auxiliary switch sub-unit. During the startup of the solid-state circuit breaker, the newly added pre-charging unit starts to work and controls the on and off of the auxiliary switch sub-unit according to the input current and / or output voltage of the solid-state circuit breaker, so that after the auxiliary switch sub-unit is in the on-off state, the input current of the solid-state circuit breaker can be limited by the current limiting sub-unit, so that after the solid-state circuit breaker is started, the voltage difference between the two ends of the main switch unit in the solid-state circuit breaker is small, and the loss of the main switch unit is also small, thereby solving the problem that the switching power electronic device of the solid-state circuit breaker flows a large current while being subjected to a large input-output voltage difference at the moment of closing, resulting in excessive power consumption, and reducing the difficulty of selecting the switching power electronic device in the solid-state circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0036] FIG1 is a schematic structural diagram of a solid-state circuit breaker provided by the prior art;

[0037] FIG2 is a structural schematic diagram 1 of a solid-state circuit breaker provided in an embodiment of the present disclosure;

[0038] FIG3 is a second structural diagram of a solid-state circuit breaker provided by an embodiment of the present disclosure;

[0039] FIG4 is a structural schematic diagram 1 of a pre-charging unit in a solid-state circuit breaker provided by an embodiment of the present disclosure;

[0040] FIG5 is a second structural diagram of a pre-charging unit in a solid-state circuit breaker provided by an embodiment of the present disclosure;

[0041] FIG6 is a third structural diagram of a solid-state circuit breaker provided in an embodiment of the present disclosure;

[0042] FIG7 is a fourth structural diagram of a solid-state circuit breaker provided in an embodiment of the present disclosure;

[0043] FIG8 is a schematic flow chart of a control method for a solid-state circuit breaker provided by an embodiment of the present disclosure;

[0044] FIG9 is a schematic diagram of a one-stage control method in a control method for a solid-state circuit breaker provided by an embodiment of the present disclosure;

[0045] FIG10 is a flow chart of another method for controlling a solid-state circuit breaker according to an embodiment of the present disclosure;

[0046] FIG11 is a schematic diagram of a two-stage control method in a solid-state circuit breaker control method provided by an embodiment of the present disclosure;

[0047] FIG12 is a schematic diagram of a three-stage control method in a control method for a solid-state circuit breaker provided by an embodiment of the present disclosure;

[0048] FIG13 is a schematic structural diagram of a controller provided in an embodiment of the present disclosure.

[0049] Icon: 101-main switch unit; 102-pre-charge unit; 103-current limiting subunit; 104-auxiliary switch subunit. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. It should be understood that the drawings in the present disclosure are only for the purpose of illustration and description and are not used to limit the scope of protection of the present disclosure. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present disclosure illustrate operations implemented according to some embodiments of the present disclosure. It should be understood that the operations of the flowchart can be implemented out of sequence, and steps that do not have a logical context relationship can be reversed in order or implemented simultaneously. In addition, those skilled in the art, guided by the contents of the present disclosure, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0051] In addition, the described embodiments are only a portion of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure generally described and shown in the drawings herein can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the disclosure claimed for protection, but merely represents selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present disclosure.

[0052] It should be noted that the term “comprising” will be used in the embodiments of the present disclosure to indicate the existence of the features claimed thereafter, but does not exclude the addition of other features.

[0053] First, before describing the technical solutions provided by the present disclosure in detail, a brief description of the relevant background involved in the present disclosure is given.

[0054] 1 is a schematic diagram of the structure of a solid-state circuit breaker in the prior art. As shown in FIG1 , the solid-state circuit breaker includes a main switch unit. When the solid-state circuit breaker is started, since the solid-state circuit breaker may be connected to a load such as a large capacitor (as shown in FIG1 ), if the main switch power electronic device in the solid-state circuit breaker is directly turned on, a large inrush current will occur, thereby affecting the voltage stability of the input bus and even causing damage to the power electronic device in the solid-state circuit breaker.

[0055] In related technologies, to address the problem of inrush current, existing solid-state circuit breakers generally operate their main switch power electronic devices in a linear amplification region, utilizing a lower drive level to limit the output current of the power electronic devices, thereby ensuring the safety of the power electronic devices and preventing significant fluctuations in the bus voltage.

[0056] However, during this period, power electronic devices experience both high currents and a significant input-output voltage differential, leading to high power consumption and severe heat buildup in conventional power electronic devices. This requires a significant safe operating area for the main switching power electronic components in solid-state circuit breakers. However, this approach presents drawbacks such as the difficulty in selecting the switching power electronic components, high costs, and unstable supply.

[0057] In order to solve the technical problems existing in the above-mentioned prior art, the present disclosure proposes a new solid-state circuit breaker structure, which mainly adds a pre-charging unit on the basis of the structure of the existing solid-state circuit breaker, and the pre-charging unit includes: a current limiting sub-unit and an auxiliary switch sub-unit; during the startup process of the solid-state circuit breaker, the newly added pre-charging module starts to work and controls the on and off of the auxiliary switch sub-unit according to the input current and / or output voltage of the solid-state circuit breaker, so that after the auxiliary switch sub-unit is in the on-off state, the input current of the solid-state circuit breaker can be limited by the current limiting sub-unit, so that after the solid-state circuit breaker is started, the voltage difference between the two ends of the main switch unit in the solid-state circuit breaker is small, and the loss of the main switch unit is also small, thereby solving the problem that the switching power electronic device of the solid-state circuit breaker is subjected to a large input-output voltage difference while passing a large current at the moment of closing, resulting in excessive power consumption, and reducing the difficulty of selecting the switching power electronic device in the solid-state circuit breaker.

[0058] The solid-state circuit breaker structure provided by the present disclosure will be described in detail as follows.

[0059] Referring to FIG. 2 , FIG. 2 is a schematic structural diagram of a solid-state circuit breaker according to an embodiment of the present disclosure. As shown in FIG. 2 , the solid-state circuit breaker includes a main switch unit 101 and a pre-charge unit 102, wherein the main switch unit 101 and the pre-charge unit 102 are connected in parallel or in series. Specifically, as shown in FIG. 2 , the main switch unit 101 and the pre-charge unit 102 are connected in parallel, while as shown in FIG. 3 , the main switch unit 101 and the pre-charge unit 102 are connected in series.

[0060] 4 , the pre-charge unit 102 includes a current limiting sub-unit 103 and an auxiliary switch sub-unit 104. For example, the current limiting sub-unit 103 may be a common resistor, an NTC thermistor, a PTC thermistor, or the like; the auxiliary switch sub-unit 104 may be a power electronic device (including but not limited to a transistor and a MOSFET), or other electrical control devices such as a relay.

[0061] The current limiting subunit 103 and the auxiliary switch subunit 104 are connected in parallel or in series. Specifically, as shown in FIG4 , the current limiting subunit 103 and the auxiliary switch subunit 104 are connected in series; as shown in FIG5 , the current limiting subunit 103 and the auxiliary switch subunit 104 are connected in parallel. Referring to FIG6 , the main switch unit 101 and the pre-charge unit 102 are connected in parallel, and the current limiting subunit 103 in the pre-charge unit 102 and the auxiliary switch subunit 104 are connected in series as an example.

[0062] 2 to 5 , the auxiliary switch subunit 104 is configured to switch on and off according to the input current and / or output voltage of the solid-state circuit breaker, and the current limiting subunit 103 is configured to limit the input current.

[0063] In this embodiment, for example, continuing to refer to Figure 6, during the startup phase of the solid-state circuit breaker, power can be first supplied to the load side connected to the output end of the solid-state circuit breaker via the current limiting subunit 103 in the pre-charge unit 102, and the on and off of the auxiliary switch subunit 104 can be controlled according to the input current and / or output voltage of the solid-state circuit breaker, so that the entire startup phase of the solid-state circuit breaker is completed under the current limiting action of the current limiting subunit 103 in the pre-charge unit 102, that is, the current limiting subunit 103 bears all the current in the startup process, and thus after the solid-state circuit breaker is started, the voltage difference across the main switch unit 101 in the solid-state circuit breaker is small, and the loss of the main switch unit 101 is also small, thereby solving the problem that the switching power electronic device of the solid-state circuit breaker flows through a large current while being subjected to a large input-output voltage difference at the moment of closing, resulting in excessive power consumption, and reducing the selection of the switching power electronic device in the solid-state circuit breaker.

[0064] It is worth noting that after the startup process of the solid-state circuit breaker is completely completed, the pre-charging unit needs to be disconnected from the main circuit or bypassed to avoid additional power consumption during normal operation of the solid-state circuit breaker.

[0065] In summary, the embodiment of the present disclosure provides a solid-state circuit breaker. On the basis of the structure of the existing solid-state circuit breaker, a pre-charging unit is added. The main switch unit and the pre-charging unit are connected in parallel or in series. The pre-charging unit includes: a current limiting sub-unit and an auxiliary switch sub-unit. During the startup of the solid-state circuit breaker, the newly added pre-charging module starts to work and controls the on and off of the auxiliary switch sub-unit according to the input current and / or output voltage of the solid-state circuit breaker, so that after the auxiliary switch sub-unit is in the on-off state, the input current of the solid-state circuit breaker can be limited by the current limiting sub-unit, so that after the solid-state circuit breaker is started, the voltage difference between the two ends of the main switch unit in the solid-state circuit breaker is small, and the loss of the main switch unit is also small, thereby solving the problem that the switching power electronic device of the solid-state circuit breaker is subjected to a large input-output voltage difference while passing a large current at the moment of closing, resulting in excessive power consumption, and reducing the selection of switching power electronic devices in the solid-state circuit breaker.

[0066] The following embodiments will specifically introduce the situation where the main switch unit and the pre-charging unit in FIG1 are connected in parallel.

[0067] 6 , the input end of the current limiting subunit 103 is connected to the input end of the main switch unit 101 , and the output end of the current limiting subunit 103 is connected to the input end of the auxiliary switch subunit 104 .

[0068] The output end of the auxiliary switch sub-unit 104 is connected to the output end of the main switch unit 101 .

[0069] The input end of the current limiting subunit 103 and the input end of the main switch unit 101 are both used as the input end of the solid-state circuit breaker, and the output end of the auxiliary switch subunit 104 and the output end of the main switch unit 101 are both used as the output end of the solid-state circuit breaker.

[0070] It can be understood that in the solid-state circuit breaker structure shown in FIG6 , the current limiting subunit 103 and the auxiliary switch subunit 104 are connected in series.

[0071] Specifically, during the solid-state circuit breaker's startup phase, the auxiliary switch subunit 104 turns on before the main switch unit 101, supplying power to the load connected to the solid-state circuit breaker's output terminal via the current-limiting subunit 103. When the load-side output voltage reaches a preset voltage threshold, the main switch unit 101 turns on again. At this point, the voltage difference across the main switch unit 101 is small, resulting in minimal losses during turn-on. This allows the selection of power electronic devices with a smaller safe operating area as the main switch unit, reducing costs and selection complexity.

[0072] It should be noted that after the main switch unit 101 is turned on, the auxiliary switch sub-unit 104 can be disconnected to disconnect the pre-charge unit 102 from the main switch unit 101; or, the auxiliary switch sub-unit 104 can be kept turned on for a period of time, that is, the load side connected to the output end of the solid-state circuit breaker is supplied with power through the current limiting sub-unit 103, the auxiliary switch sub-unit 104 and the main switch unit 101. After the solid-state circuit breaker startup process is completely completed, the auxiliary switch sub-unit 104 is controlled to disconnect to disconnect the pre-charge unit 102 from the main switch unit 101.

[0073] The following embodiment will specifically introduce the situation where the main switch unit and the pre-charging unit in FIG2 are connected in series.

[0074] 7 , the input end of the current limiting subunit 103 is connected to the input end of the auxiliary switch subunit 104 and is configured to receive the input current, that is, the input end of the current limiting subunit 103 and the input end of the auxiliary switch subunit 104 are both used as the input end of the solid-state circuit breaker.

[0075] The output end of the current limiting sub-unit 103 and the output end of the auxiliary switch sub-unit 104 are connected to the input end of the main switch unit 101 .

[0076] It can be understood that in the solid-state circuit breaker structure shown in FIG. 7 , the current limiting subunit 103 and the auxiliary switch subunit 104 are connected in parallel.

[0077] Specifically, at the beginning of the startup phase of the solid-state circuit breaker, the auxiliary switch subunit 104 in the pre-charge unit 102 is not turned on. At this time, the current limiting subunit 103 and the main switch unit 101 are connected in series to form a power supply path, that is, power is supplied to the load side connected to the output end of the solid-state circuit breaker via the current limiting subunit 103 and the main switch unit 101. Due to the presence of the current limiting subunit 103, the current flowing through the main switch unit 101 is relatively small, and the voltage difference between the input voltage of the solid-state circuit breaker and the output voltage of the solid-state circuit breaker is mainly borne by the current limiting subunit 103, and the voltage difference borne by the main switch unit 101 is very small. Therefore, the loss of the main switch unit 101 is relatively small, and a power electronic device with a smaller safe operating area can be selected as the main switch unit to reduce cost and selection difficulty.

[0078] It should be noted that when the output voltage of the solid-state circuit breaker reaches a preset voltage threshold, the auxiliary switch subunit 104 is controlled to conduct, bypassing the current-limiting subunit 103. Since the auxiliary switch subunit 104 conducts similarly to a short circuit, the remaining startup process is completed solely by the main switch unit 101. Since a certain voltage has already been established at the output end of the solid-state circuit breaker, the voltage difference across the main switch unit 101 is small, and the losses in the main switch unit 101 are also low.

[0079] At the same time, the present disclosure provides a control method for a solid-state circuit breaker, which is applied to the solid-state circuit breaker provided in the above embodiment to control the state of the main switch unit and the state of the pre-charge unit in the solid-state circuit breaker. Referring to Figure 8, the method includes:

[0080] S801. Determine a control mode of a solid-state circuit breaker.

[0081] The control mode includes: a one-stage control mode or a multi-stage control mode. For example, the multi-stage control mode may include but is not limited to: a two-stage control mode, a three-stage control mode or a four-stage control mode.

[0082] Optionally, based on the aforementioned hardware circuit structure of the solid-state circuit breaker, the present disclosure further proposes a corresponding control method. According to the opening time points of the auxiliary switch unit and the main switch unit, the control method of the startup phase is divided into a single-stage control method or a multi-stage control method.

[0083] S802: If the control mode is a one-stage control mode, controlling the on and off of the auxiliary switch subunit in the solid-state circuit breaker according to the input current and / or output voltage of the solid-state circuit breaker.

[0084] In this embodiment, under a one-stage control mode, the entire startup process is completed under the current limiting of the pre-charge unit. In this one-stage control mode, the current limiting subunit in the pre-charge unit does not exit until the startup of the solid-state circuit breaker is substantially complete. Therefore, under this one-stage control mode, the current limiting subunit bears all the current during the startup of the solid-state circuit breaker, resulting in greater thermal stress, while the voltage difference borne by the main switch unit is very small. As a result, the main switch unit has lower losses, and power electronic devices with a smaller safe operating area can be selected as the main switch unit, thereby reducing the cost and selection difficulty of the main switch unit.

[0085] S803. If the control mode is a multi-stage control mode, the on / off of the auxiliary switch subunit and the driving level of the main switch unit in the solid-state circuit breaker are controlled according to the input current and / or output voltage of the solid-state circuit breaker and the current threshold and voltage threshold corresponding to the multi-stage control mode.

[0086] In this embodiment, for example, referring to FIG6 , the main switch unit and the pre-charge unit are connected in parallel. When the multi-stage control mode is a two-stage control mode, the startup process of the solid-state circuit breaker is divided into two stages. Specifically, in the first startup stage of the solid-state circuit breaker, the auxiliary switch sub-unit is in the on state. That is, in the first startup stage, only the current limiting sub-unit in the pre-charge unit charges the load side of the solid-state circuit breaker. When it is detected that the input current Iin of the solid-state circuit breaker reaches a preset current threshold Ith and / or the output voltage Uout of the solid-state circuit breaker reaches a preset voltage threshold Uth, the second startup stage is entered. That is, the auxiliary switch sub-unit is controlled to switch from the on state to the off state, and the drive level of the main switch unit is controlled to V_drive, thereby starting the solid-state circuit breaker. That is, in the second startup stage, the connection between the main switch unit and the pre-charge unit is disconnected, or only a small portion of the charging current is taken on, and the main switch unit takes on most or all of the remaining charging current until charging is completed. Under the two-stage control mode, the main switch unit can operate in the linear amplification area or the variable resistance area (low on-resistance). At this time, the voltage difference between the two ends of the main switch unit is small, and the loss when it is turned on is small. Power electronic devices with a smaller safe operating area can be selected to reduce costs and selection difficulty.

[0087] Optionally, the case where the control mode is a one-stage control mode will be described in detail below.

[0088] Optionally, if the change state of the input current of the solid-state circuit breaker is no longer decreasing, and / or the change state of the output voltage of the solid-state circuit breaker is no longer increasing, the auxiliary switch sub-unit is controlled to enter the target on-off state; wherein, if the auxiliary switch sub-unit is connected in series with the current limiting sub-unit, the target on-off state is off; if the auxiliary switch sub-unit is connected in parallel with the current limiting sub-unit, the target on-off state is on.

[0089] In this embodiment, for example, referring again to Figures 6 and 9 , when the pre-charge unit and the main switch unit are connected in parallel and the control mode is a one-stage control mode, specifically, during the startup phase of the solid-state circuit breaker, the auxiliary switch subunit switches from the off state to the on state, i.e., only the current limiting subunit in the pre-charge unit charges the load side of the solid-state circuit breaker. When it is detected that the input current Iin of the solid-state circuit breaker is no longer decreasing and / or the output voltage Uout of the solid-state circuit breaker is no longer increasing, the auxiliary switch subunit is controlled to switch from the on state to the off state, i.e., after startup is completed, the connection between the main switch unit and the pre-charge unit is disconnected. Therefore, under the one-stage control mode, the current limiting subunit bears all the current during the startup process of the solid-state circuit breaker, resulting in greater thermal stress, while the voltage difference borne by the main switch unit is very small. Therefore, the main switch unit has lower losses, and power electronic devices with a smaller safe operating area can be selected as the main switch unit, thereby reducing the cost and selection difficulty of the main switch unit.

[0090] For another example, referring to FIG7 , when the pre-charge unit and the main switch unit are connected in series and the control mode is a one-stage control mode, specifically, during the startup phase of the solid-state circuit breaker, the auxiliary switch sub-unit is in the disconnected state, that is, only the current limiting sub-unit in the pre-charge unit provides a charging signal to the load side of the solid-state circuit breaker; when it is detected that the input current Iin of the solid-state circuit breaker is no longer decreasing, and / or the output voltage Uout of the solid-state circuit breaker is no longer increasing, the auxiliary switch sub-unit is controlled to switch from the disconnected state to the closed state, that is, after the startup is completed, the auxiliary switch sub-unit is equivalent to a wire, and the current limiting sub-unit is similar to being short-circuited.

[0091] It should be noted that the main switch unit is not controlled during the entire startup process of the solid-state circuit breaker. As shown in Figure 6, the main switch unit is in the open state during the entire startup process of the solid-state circuit breaker; as shown in Figure 7, the main switch unit is in the closed state during the entire startup process of the solid-state circuit breaker.

[0092] The following describes in detail the case where the control mode is a multi-stage control mode.

[0093] Optionally, referring to FIG10 , if the control mode is a multi-stage control mode, the above step S803 includes:

[0094] S1001. Determine the number of stages corresponding to the multi-stage control method.

[0095] Optionally, the multi-stage control mode includes a two-stage control mode or a three-stage control mode. For example, the two-stage control mode corresponds to two stages, and the three-stage control mode corresponds to three stages.

[0096] It can be understood that the two-stage control method means that the startup phase of the solid-state circuit breaker is divided into two stages, and the three-stage control method means that the startup phase of the solid-state circuit breaker is divided into three stages.

[0097] S1002: Determine multiple current thresholds and multiple voltage thresholds corresponding to the multi-stage control method according to the number of stages.

[0098] Exemplarily, for example, the number of segments corresponding to the two-stage control mode is two, then the current threshold corresponding to the two-stage control mode is the first current threshold Ith1, and the voltage threshold corresponding to the two-stage control mode is the first voltage threshold Uth1, that is, the number of current thresholds (or voltage thresholds) corresponding to the two-stage control mode is one.

[0099] For another example, if the number of segments corresponding to the three-stage control mode is three, then the current threshold corresponding to the three-stage control mode is the second current threshold Ith2 and the third current threshold Ith3, and the voltage threshold corresponding to the three-stage control mode is the second voltage threshold Uth2 and the third voltage threshold Uth3, that is, the number of current thresholds (or voltage thresholds) corresponding to the two-stage control mode is two.

[0100] S1003 : Control the on / off of the auxiliary switch subunit and the driving level of the main switch unit in the solid-state circuit breaker according to the input current and / or output voltage of the solid-state circuit breaker, multiple current thresholds, and multiple voltage thresholds.

[0101] In this embodiment, when the control mode is a multi-stage control mode, whether the input current and / or output voltage of the solid-state circuit breaker reaches a certain current threshold and a certain voltage threshold is mainly used as a judgment condition to determine whether to control the on and off of the auxiliary switch sub-unit in the solid-state circuit breaker and the drive level of the main switch unit, so as to achieve a smooth transition between the various stages during the startup process of the solid-state circuit breaker.

[0102] Optionally, the above step S1003 includes:

[0103] If the input current of the solid-state circuit breaker reaches a first current threshold, and / or the output voltage of the solid-state circuit breaker reaches a first voltage threshold, the auxiliary switch sub-unit is controlled to enter the on-off state corresponding to the first current threshold and / or the first voltage threshold, and the driving level corresponding to the first current threshold and / or the first voltage threshold is input to the main switch unit, wherein the first current threshold is any one of multiple current thresholds, and the first voltage threshold is any one of multiple voltage thresholds.

[0104] In this embodiment, for example, referring to Figures 6 and 11 , when the pre-charging unit and the main switch unit are connected in parallel and the multi-stage control mode is a two-stage control mode, the solid-state circuit breaker startup process is divided into two stages. Specifically, in the first startup stage of the solid-state circuit breaker, the auxiliary switch sub-unit switches from the disconnected state to the conductive state. That is, in the first startup stage, only the current limiting sub-unit in the pre-charging unit charges the load side of the solid-state circuit breaker. When it is detected that the input current Iin of the solid-state circuit breaker reaches the first current threshold Ith1 and / or the output voltage Uout of the solid-state circuit breaker reaches the first voltage threshold Uth1, the second startup stage begins, the auxiliary switch sub-unit is controlled to switch from the conductive state to the disconnected state, and the drive level of the main switch unit is controlled to V_drive, thereby starting the solid-state circuit breaker. That is, in the second startup stage, the connection between the main switch unit and the pre-charging unit is disconnected, or only a small portion of the charging current is taken on, and the main switch unit takes on most or all of the remaining charging current until charging is completed. Under the two-stage control mode, the main switch unit can operate in the linear amplification area or the variable resistance area (low on-resistance). At this time, the voltage difference between the two ends of the main switch unit is small, and the loss when it is turned on is small. Power electronic devices with a smaller safe operating area can be selected to reduce costs and selection difficulty.

[0105] For another example, referring to Figures 6 and 12, when the pre-charging unit and the main switch unit are connected in parallel, and the multi-stage control mode is a three-stage control mode, the startup process of the solid-state circuit breaker is divided into three stages. Specifically, in the first startup stage of the solid-state circuit breaker, the auxiliary switch sub-unit is in the on state, that is, in the first startup stage, only the current limiting sub-unit in the pre-charging unit provides a charging signal to the load side of the solid-state circuit breaker; when it is detected that the input current Iin of the solid-state circuit breaker reaches the second current threshold Ith2, and / or the output voltage Uout of the solid-state circuit breaker reaches the second voltage threshold Uth2, the second startup stage is entered, the auxiliary switch sub-unit is controlled to continue to remain in the on state, and the driving level of the main switch unit is controlled to be V_drive1, that is, in the second startup stage, the pre-charging unit only bears a small part of the charging current, and the main switch unit bears the main or All the remaining charging current; when it is detected that the input current Iin of the solid-state circuit breaker reaches the third current threshold value Ith3, and / or the output voltage Uout of the solid-state circuit breaker reaches the third voltage threshold value Uth3, the third startup phase is entered, and the auxiliary switch sub-unit is controlled to switch from the on state to the off state, that is, the connection between the main switch unit and the pre-charge unit is disconnected, and the drive level of the main switch unit is controlled to be adjusted from V_drive1 to V_drive2, wherein the drive level V_drive1 is lower than the drive level V_drive2, and the main switch unit operates in the variable resistance region, bearing the entire charging current until the startup is completed. Under the three-stage control mode, the main switch unit can operate in the linear amplification region or the variable resistance region (low on-resistance). At this time, the voltage difference between the two ends of the main switch unit is small, and the loss when it is turned on is small. Power electronic devices with a smaller safe operating area can be selected to reduce cost and selection difficulty.

[0106] It can be understood that when the number of stages of the multi-stage control mode is large enough, the driving level of the main switch unit can be approximated as a smooth curve.

[0107] It should be noted that the above embodiment only describes in detail the control process of the one-stage control mode and the multi-stage control mode when the pre-charging unit and the main switch unit are connected in parallel as shown in Figure 6. When the pre-charging unit and the main switch unit are connected in series as shown in Figure 7, the control principles of the one-stage control mode and the multi-stage control mode are consistent with those of the above embodiment and will not be further described.

[0108] Optionally, the changing waveforms of the input current of the solid-state circuit breaker and the output voltage of the solid-state circuit breaker are not limited to the waveforms shown in FIG. 9 , FIG. 11 and FIG. 12 .

[0109] The following describes a controller and a storage medium used to execute the control method of the solid-state circuit breaker provided by the present disclosure. The specific implementation process and technical effects thereof are described above and will not be repeated below.

[0110] FIG13 is a schematic diagram of a controller provided in an embodiment of the present disclosure. The controller may be integrated into a terminal device or a chip of the terminal device. The terminal may be a computing device with data processing capabilities.

[0111] The controller includes: a processor 1301 and a memory 1302 .

[0112] The memory 1301 is configured to store programs, and the processor 1301 calls the programs stored in the memory 1302 to execute the above method embodiment. The specific implementation methods and technical effects are similar and will not be repeated here.

[0113] Among them, the memory 1302 stores program code, and when the program code is executed by the processor 1301, the processor 1301 executes various steps in the control method of the solid-state circuit breaker according to various exemplary embodiments of the present disclosure described in the above-mentioned control method section of the solid-state circuit breaker of this specification.

[0114] The processor 1301 may be a general-purpose processor, such as a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, or discrete hardware components, and may implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present disclosure. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present disclosure may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0115] Memory 1302 is a non-volatile computer-readable storage medium that can be configured to store non-volatile software programs, non-volatile computer executable programs and modules. The memory may include at least one type of storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory, a random access memory (RAM), a static random access memory (SRAM), a programmable read-only memory (PROM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic memory, a disk, an optical disk, etc. The memory is any other medium that can be configured to carry or store a desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory 1302 in the embodiment of the present disclosure can also be a circuit or any other device that can realize a storage function, configured to store program instructions and / or data.

[0116] Optionally, the present disclosure further provides a program product, such as a computer-readable storage medium, comprising a program, which is configured to perform the above method embodiments when executed by a processor.

[0117] In the several embodiments provided in the present disclosure, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0118] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0119] In addition, the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0120] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor (English: processor) to execute some steps of the method described in each embodiment of the present disclosure. The aforementioned storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (English: Read-Only Memory, abbreviated: ROM), a random access memory (English: Random Access Memory, abbreviated: RAM), a magnetic disk or an optical disk, and other media that can store program code. Industrial Applicability

[0121] The above solution solves the problem of excessive power consumption caused by the large input-output voltage difference while the switching power electronic devices of the solid-state circuit breaker flow through a large current at the moment of closing, thereby reducing the difficulty of selecting the switching power electronic devices in the solid-state circuit breaker.

Claims

1. A solid-state circuit breaker, characterized in that: The solid-state circuit breaker comprises: a main switch unit and a pre-charging unit, wherein the main switch unit and the pre-charging unit are connected in parallel or in series; The pre-charging unit includes: a current limiting sub-unit and an auxiliary switch sub-unit; The current limiting subunit and the auxiliary switch subunit are connected in parallel or in series; The auxiliary switch subunit is configured to switch on and off according to the input current and / or output voltage of the solid-state circuit breaker, and the current limiting subunit is configured to limit the input current.

2. The solid-state circuit breaker according to claim 1, characterized in that: The input end of the current limiting subunit is connected to the input end of the main switch unit, and the output end of the current limiting subunit is connected to the input end of the auxiliary switch subunit; The output end of the auxiliary switch subunit is connected to the output end of the main switch unit.

3. The solid-state circuit breaker according to claim 1 or 2, characterized in that: The input end of the current limiting subunit is connected to the input end of the auxiliary switch subunit and is configured to receive input current; The output end of the current limiting sub-unit and the output end of the auxiliary switch sub-unit are connected to the input end of the main switch unit.

4. A control method for a solid-state circuit breaker, characterized in that: Used to control the solid-state circuit breaker according to any one of claims 1 to 3, the method comprising: Determining a control mode of the solid-state circuit breaker, the control mode including: a one-stage control mode or a multi-stage control mode; If the control mode is a one-stage control mode, the on and off of the auxiliary switch subunit in the solid-state circuit breaker is controlled according to the input current and / or output voltage of the solid-state circuit breaker; If the control method is a multi-stage control method, the on and off of the auxiliary switch subunit in the solid-state circuit breaker and the driving level of the main switch unit are controlled according to the input current and / or output voltage of the solid-state circuit breaker and the current threshold and voltage threshold corresponding to the multi-stage control method.

5. The method according to claim 4, characterized in that The method of controlling the on and off of the auxiliary switch subunit in the solid-state circuit breaker according to the input current and / or output voltage of the solid-state circuit breaker comprises: If the change state of the input current of the solid-state circuit breaker is no longer decreasing, and / or the change state of the output voltage of the solid-state circuit breaker is no longer increasing, the auxiliary switch sub-unit is controlled to enter the target on-off state; wherein, if the auxiliary switch sub-unit is connected in series with the current limiting sub-unit, the target on-off state is off; if the auxiliary switch sub-unit is connected in parallel with the current limiting sub-unit, the target on-off state is on.

6. The method according to claim 4 or 5, characterized in that: The controlling of the on and off of the auxiliary switch subunit in the solid-state circuit breaker and the driving level of the main switch unit according to the input current and / or output voltage of the solid-state circuit breaker and the current threshold and voltage threshold corresponding to the multi-stage control mode includes: Determining the number of stages corresponding to the multi-stage control method; According to the number of stages, determining a plurality of current thresholds and a plurality of voltage thresholds corresponding to the multi-stage control mode; According to the input current and / or output voltage of the solid-state circuit breaker, the multiple current thresholds and the multiple voltage thresholds, the on and off of the auxiliary switch subunit and the driving level of the main switch unit in the solid-state circuit breaker are controlled.

7. The method according to claim 6, characterized in that The controlling the on and off of the auxiliary switch subunit in the solid-state circuit breaker and the driving level of the main switch unit according to the input current and / or output voltage of the solid-state circuit breaker, the multiple current thresholds and the multiple voltage thresholds includes: If the input current of the solid-state circuit breaker reaches a first current threshold, and / or the output voltage of the solid-state circuit breaker reaches a first voltage threshold, the auxiliary switch subunit is controlled to enter the on-off state corresponding to the first current threshold and / or the first voltage threshold, and the driving level corresponding to the first current threshold and / or the first voltage threshold is input to the main switch unit, wherein the first current threshold is any one of the multiple current thresholds, and the first voltage threshold is any one of the multiple voltage thresholds.

8. The method according to any one of claims 4 to 7, characterized in that: The multi-stage control method includes a two-stage control method or a three-stage control method.

9. A controller, characterized in that: include: A processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the controller is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of any method as described in claims 4-8.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method according to any one of claims 4 to 8 are executed.

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