Bidirectional current control device and electrical apparatus

Abstract

The embodiment of the utility model provides a kind of bidirectional current control device and electrical equipment.The device includes: full bridge unit and combined inductance unit;The first end of the full bridge unit is connected with the first end of the combined inductance unit, and the second end of the full bridge unit is connected with the second end of the combined inductance unit;The third end of the full bridge unit is used to connect one end of power supply, and the fourth end of the full bridge unit is used to connect one end of load, and the third end of the combined inductance unit is used to connect the other end of load and the other end of power supply;The full bridge unit is used to control the flow direction of current in circuit;The combined inductance unit is used to be turned on or turned off based on current, and the impact current generated in the initial stage of power-on is inhibited.The bidirectional current use function of combined inductor is realized.

Description

Technical Field

[0001] This utility model relates to the field of current control technology, and more specifically, to a bidirectional current control device and electrical equipment. Background Technology

[0002] In solid-state circuit breakers and hybrid solid-state circuit breakers, the current is generally unidirectional. This is because the semiconductor device in a solid-state circuit breaker conducts current unidirectionally. This unidirectional current conduction of solid-state circuit breakers limits their application range. With the continuous development of technology, bidirectional power supply is required in application scenarios such as rail transit and DC power transmission and distribution networks where solid-state circuit breakers are used.

[0003] Therefore, this utility model proposes a bidirectional current control device. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a bidirectional current control device that enables bidirectional power supply to the combined inductor.

[0005] To achieve the above objectives, the technical solution adopted in this utility model embodiment is as follows:

[0006] This utility model provides a bidirectional current control device, including: a full-bridge unit and a combined inductor unit;

[0007] The first end of the full-bridge unit is connected to the first end of the combined inductor unit, and the second end of the full-bridge unit is connected to the second end of the combined inductor unit;

[0008] The third terminal of the full-bridge unit is used to connect to one end of the power supply, the fourth terminal of the full-bridge unit is used to connect to one end of the load, and the third terminal of the combined inductor unit is used to connect the other end of the load and the other end of the power supply.

[0009] The full-bridge unit is used to control the direction of current flow in the circuit;

[0010] The combined inductor unit is used to suppress the inrush current generated during the initial power-on phase.

[0011] Optionally, the full-bridge unit includes: a first bridge module and a second bridge module;

[0012] The first end of the first bridge module is connected to the first end of the second bridge module. The first end of the first bridge module is used to connect to one end of the power supply. The second end of the first bridge module is connected to the first end of the combined inductor unit. The third end of the first bridge module is connected to the third end of the second bridge module. The third end of the first bridge module is used to connect to one end of the load.

[0013] The second end of the second bridge module is connected to the second end of the combined inductor unit.

[0014] Optionally, the first bridge module includes: a first diode and a second diode;

[0015] The anode of the first diode is connected to the first terminal of the second bridge module, and the anode of the first diode is used to connect to one end of the power supply.

[0016] The cathode of the first diode is connected to the first terminal of the combined inductor unit and the cathode of the second diode, respectively.

[0017] The positive terminal of the second diode is connected to the third terminal of the second bridge module, and the positive terminal of the second diode is used to connect one end of the load.

[0018] Optionally, the second bridge module includes: a third diode and a fourth diode;

[0019] The negative terminal of the third diode is connected to the positive terminal of the first diode, and the negative terminal of the third diode is used to connect to one end of the power supply. The positive terminal of the third diode is connected to the second end of the combined inductor unit and the positive terminal of the fourth diode, respectively.

[0020] The negative terminal of the fourth diode is connected to the positive terminal of the second diode, and the negative terminal of the fourth diode is used to connect one end of the load.

[0021] Optionally, the combined inductor unit includes: a switch control module and a current suppression module;

[0022] One end of the switch control module is connected to the negative terminals of the first diode and the second diode, respectively, and the other end of the switch control module is connected to the first end of the current suppression module.

[0023] The second terminal of the current suppression module is connected to the positive terminals of the third diode and the fourth diode, respectively, and the third terminal of the current suppression module is connected to the other end of the load and the other end of the power supply, respectively.

[0024] Optionally, the switch control module includes: a first semiconductor switch, a first resistor, and a drive control component;

[0025] The first terminal of the first semiconductor switch is connected to the cathode of the first diode and the cathode of the second diode, respectively, and the second terminal of the first semiconductor switch is connected to the first terminal of the drive control component.

[0026] The third terminal of the first semiconductor switch is connected to one end of the first resistor, and the other end of the first resistor is connected to the first terminal of the current suppression module.

[0027] The second end of the drive control component is connected to one end of the first resistor, and the third end of the drive control component is connected to the second end of the first resistor.

[0028] Optionally, the current suppression module includes: a fifth diode and an inductor;

[0029] The negative terminal of the fifth diode is connected to the other end of the first resistor and one end of the inductor, respectively, and the positive terminal of the fifth diode is connected to the other end of the load and the other end of the power supply, respectively.

[0030] The other end of the inductor is connected to the positive terminal of the third diode and the positive terminal of the fourth diode, respectively.

[0031] Optionally, it may also include: a semiconductor switching unit;

[0032] One end of the semiconductor switching unit is connected to the first end of the full-bridge unit, and the other end of the semiconductor switching unit is connected to the second end of the full-bridge unit.

[0033] Optionally, the semiconductor switching unit includes: a switch, a second semiconductor switch, a second resistor, a capacitor, and a metal oxide varistor;

[0034] One end of the switch is connected to the first end of the full-bridge unit, and the other end of the switch is connected to one end of the second semiconductor switch, one end of the second resistor, and one end of the metal oxide varistor, respectively.

[0035] The other end of the second resistor is connected to one end of the capacitor;

[0036] The other end of the second semiconductor switch is connected to the other end of the capacitor, the other end of the metal oxide varistor, and the second end of the full-bridge unit.

[0037] The beneficial effects of this invention are as follows: By connecting the full-bridge unit and the combined inductor unit, the combined inductor unit can be internally connected within the full-bridge unit. When current is present in the circuit, the combined inductor unit can conduct. Based on the full-bridge unit, the current at the third terminal of the full-bridge unit flows through the combined inductor unit to the fourth terminal of the full-bridge unit, thus allowing the left-side current of the bidirectional current control device to flow to the right-side current; conversely, the current at the fourth terminal of the full-bridge unit can flow through the combined inductor unit to the third terminal of the full-bridge unit, thus allowing the right-side current of the bidirectional current control device to flow to the left-side current. This enables bidirectional current use of the combined inductor, broadening its application range. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the structure of the first bidirectional current control device provided in the embodiment of this utility model;

[0040] Figure 2 A schematic diagram of the structure of the second bidirectional current control device provided in this embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the structure of the third bidirectional current control device provided in this embodiment of the present utility model;

[0042] Figure 4 A schematic diagram of the structure of the fourth bidirectional current control device provided in this embodiment of the present utility model;

[0043] Figure 5 This is a schematic diagram of the structure of the fifth bidirectional current control device provided in the embodiment of this utility model. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this utility model are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this utility model illustrate operations implemented according to some embodiments of this utility model. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this utility model, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0045] Furthermore, the described embodiments are merely some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0048] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0049] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0050] Please refer to Figure 1 This is a structural schematic diagram of the first bidirectional current control device 10 provided in this embodiment of the present invention, as shown below. Figure 1 As shown, it may include: a full-bridge unit 11 and a combined inductor unit 12.

[0051] like Figure 1 As shown, the first end of the full-bridge unit 11 is connected to the first end of the combined inductor unit 12, and the second end of the full-bridge unit 11 is connected to the second end of the combined inductor unit 12. Specifically, the first end of the full-bridge unit 11 can be connected to the first end of the combined inductor unit 12 via a wire, and the second end of the full-bridge unit 11 can be connected to the second end of the combined inductor unit 12 via a wire.

[0052] Optionally, the third terminal of the full-bridge unit 11 is used to connect to one end of the power supply. Specifically, the third terminal of the full-bridge unit 11 can be connected to the positive terminal of the power supply via a wire, or the third terminal of the full-bridge unit 11 can be connected to the negative terminal of the power supply via a wire. The fourth terminal of the full-bridge unit 11 is used to connect to one end of the load, and the third terminal of the combined inductor unit 12 can be used to connect the other end of the load and the other end of the power supply. Wherein, if the power supply connected to the full-bridge unit 11 is the positive terminal of the power supply, then the other end of the power supply connected to the third terminal of the combined inductor unit 12 is the negative terminal of the power supply; if the power supply connected to the full-bridge unit 11 is the negative terminal of the power supply, then the other end of the power supply connected to the third terminal of the combined inductor unit 12 is the positive terminal of the power supply.

[0053] The load can include resistive loads, inductive loads, and capacitive loads. Resistive loads can be, for example, resistors; inductive loads can be, for example, transformers or inductors; and capacitive loads can be, for example, capacitors or capacitor banks.

[0054] Optionally, from Figure 1 As can be seen, the third terminal of the full-bridge unit 11 is connected to the power supply, and the fourth terminal is connected to the load. For the bidirectional current control device composed of the full-bridge unit 11 and the combined inductor unit 12, the left side of the bidirectional current control device 10 is connected to the power supply, and the right side is connected to the load. Another connection method is that the third terminal of the full-bridge unit 11 is connected to the load, and the fourth terminal is connected to the power supply, that is, the left side of the bidirectional current control device is connected to the load, and the right side is connected to the power supply. Alternatively, the third terminal of the full-bridge unit 11 is connected to the power supply, and the fourth terminal is also connected to the power supply, that is, the left side of the bidirectional current control device is connected to the power supply, and the right side is connected to the power supply. Other connection methods are also possible.

[0055] Optionally, the full-bridge unit 11 can be used to control the direction of current flow in the circuit, and the combined inductor unit 12 can be used to turn on or off based on current, and suppress the inrush current generated in the initial stage of power-on. Through the connection between the full-bridge unit 11 and the combined inductor unit 12, the combined inductor unit 12 can be internally connected to the full-bridge unit 11. When current exists in the circuit, the combined inductor unit 12 can conduct, allowing the current at the third terminal of the full-bridge unit 11 to flow through the combined inductor unit 12 to the fourth terminal of the full-bridge unit 11, thus allowing the left-side current of the bidirectional current control device to flow to the right-side current; alternatively, the current at the fourth terminal of the full-bridge unit 11 can flow through the combined inductor unit 12 to the third terminal of the full-bridge unit 11, thus allowing the right-side current of the bidirectional current control device to flow to the left-side current. This enables bidirectional current use of the combined inductor, making its application range wider.

[0056] Optionally, when the load is capacitive, a large inrush current will occur during the initial power-on phase of the circuit. In this case, the combined inductor unit can be used to suppress the inrush current to avoid misdiagnosis caused by the inrush current. When the connected load is not capacitive, no inrush current will be generated, so the combined inductor unit 12 can be deactivated.

[0057] Figure 2 A schematic diagram of the structure of the second bidirectional current control device provided in this embodiment of the present invention is shown below. Figure 2 As shown, the full-bridge unit 11 may include a first bridge module 111 and a second bridge module 112.

[0058] Reference Figure 2 The first end of the first bridge module 111 is connected to the first end of the second bridge module 112, and the first end of the first bridge module 111 is used to connect to one end of the power supply. The second end of the first bridge module 111 is connected to the first end 12 of the combined inductor unit 12. The third end of the first bridge module 111 is connected to the third end of the second bridge module 112, and the third end of the first bridge module 111 is used to connect to one end of the load. The second end of the second bridge module 112 is connected to the second end of the combined inductor unit 12.

[0059] Optionally, the second end of the first bridge module 111 is equivalent to the first end of the aforementioned full-bridge unit 11 and is connected to the first end of the combined inductor unit 12; the second end of the second bridge module 112 is equivalent to the second end of the aforementioned full-bridge unit 11 and is connected to the second end of the combined inductor unit 12.

[0060] Optionally, from Figure 2 The connection relationship shows that the first bridge module 111 and the second bridge module 112 are connected in parallel, and the first bridge module 111 and the second bridge module 112 are internally connected to a combined inductor unit 12.

[0061] Figure 3 A schematic diagram of the structure of the third bidirectional current control device provided in the embodiment of this utility model is shown below. Figure 3 As shown, the first bridge module 111 may include a first diode 1111 and a second diode 1112.

[0062] like Figure 3 As shown, the anode of the first diode 1111 is connected to the first terminal of the second bridge module 112, and the anode of the first diode 1111 is used to connect to one end of the power supply; the cathode of the first diode 1111 is connected to both the first terminal of the combined inductor unit 12 and the cathode of the second diode 1112. Therefore, the cathodes of the first diode 1111 and the second diode 1112 are connected, meaning that the first diode 1111 and the second diode 1112 do not conduct simultaneously.

[0063] Optionally, the positive terminal of the second diode 1112 is connected to the third terminal of the second bridge module 112. The positive terminal of the second diode can be used to connect one end of the load.

[0064] Continue to refer to Figure 3 The second bridge module 112 may include a third diode 1121 and a fourth diode 1122.

[0065] like Figure 3 As shown, the cathode of the third diode 1121 is connected to the anode of the first diode 1111, and the cathode of the third diode 1121 can be used to connect one end of the power supply. The anode of the third diode 1121 can be connected to the second end of the combined inductor unit 12 and the anode of the fourth diode 1122, respectively. The cathode of the fourth diode 1122 is connected to the anode of the second diode 1112, and the cathode of the fourth diode 1122 can be used to connect one end of the load.

[0066] Then from Figure 3 It can be seen that the positive terminal of the third diode 1121 is connected to the positive terminal of the fourth diode 1122, that is, the third diode 1121 and the fourth diode 1122 are not conducting at the same time.

[0067] Optionally, Figure 3 The first terminal of the combined inductor unit 12 is connected to the cathode of the first diode 1111 and the cathode of the second diode 1112. The second terminal of the combined inductor unit 12 is connected to the cathodes of the third diode 1121 and the fourth diode 1122. Therefore, the combined inductor unit 12 can be internally connected between the first diode 1111, the second diode 1112, the third diode 1121, and the fourth diode 1122. Since the combined inductor unit 12 can be turned on or off based on current, when current flows out from the first diode 1111, the current flows sequentially through the first diode 1111, the combined inductor unit 12, and the fourth diode 1122; when current flows out from the second diode 1112, the current flows sequentially through the second diode 1112, the combined inductor unit 12, and the third diode 1121. This allows for bidirectional current control, enabling current to flow in both directions.

[0068] Figure 4 A schematic diagram of the structure of the fourth bidirectional current control device provided in this embodiment of the present invention is shown below. Figure 4 As shown, the combined inductor unit 12 may include a switch control module 121 and a current suppression module 122.

[0069] like Figure 4As shown, one end of the switch control module 121 is connected to the negative terminal of the first diode 1111 and the negative terminal of the second diode 1112, respectively, and the other end of the switch control module 121 is connected to the first end of the current suppression module 122.

[0070] Optionally, the second terminal of the current suppression module 122 can be connected to the positive terminal of the third diode 1121 and the positive terminal of the fourth diode 1122 respectively, and the third terminal of the current suppression module 122 can be connected to the other end of the load and the other end of the power supply respectively.

[0071] In this configuration, one end of the switch control module 121 corresponds to the first end of the combined inductor unit 12, the second end of the current suppression module 122 corresponds to the second end of the combined inductor unit 12, and the third end of the current suppression module 122 corresponds to the third end of the combined inductor unit 12.

[0072] Continue as Figure 4 As shown, the switch control module 121 may include: a first semiconductor switch 1211, a first resistor 1212, and a drive control component 1213.

[0073] like Figure 4 As shown, the first terminal of the first semiconductor switch 1211 is connected to the cathode of the first diode 1111 and the cathode of the second diode 1112, respectively. The second terminal of the first semiconductor switch 1211 is connected to the first terminal of the drive control component 1213. The third terminal of the first semiconductor switch 1211 can be connected to one end of the first resistor 1212, and the other end of the first resistor 1212 can be connected to the first terminal of the current suppression module 122.

[0074] Optionally, the second terminal of the drive control component 1213 can be connected to one end of the first resistor 1212, and the third terminal of the drive control component 1213 can be connected to the other end of the first resistor 1212; or the second terminal of the drive control component 1213 can be connected to the other end of the first resistor 1212, and the third terminal of the drive control component 1213 can be connected to one end of the first resistor 1212. Wherein, the second terminal of the drive control component 1213 can be the first input terminal of the drive control component 1213, the third terminal of the drive control component 1213 can be the second input terminal of the drive control component 1213, and the first terminal of the drive control component 1213 can be the output terminal of the drive control component 1213. Thus, the drive control component 1213 has two input terminals and one output terminal. These two input terminals can receive the voltage across the first resistor 1212, and the drive control component 1213 can output a corresponding control signal to the first semiconductor switch 1211 based on the received voltage.

[0075] Optionally, the drive control component 1213 can receive the voltage across the first resistor 1212 and output different control signals according to the change of the voltage across the first resistor 1212, so as to control the conduction or cutoff of the first semiconductor switch 1211 connected to the third terminal of the drive control component 1213 based on the control signals.

[0076] The first semiconductor switch 1211 can be a semiconductor device, specifically a power device, including but not limited to power switches, transistors (IGBT (Insulated Gate Bipolar Transistor), MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), bipolar transistors, diodes, etc.). Figure 4 The power device used in the demonstration is a MOSFET.

[0077] Specifically, the driving component can control the first semiconductor switch to be turned on or off at high frequency according to the voltage across the first resistor and a preset threshold. When the first semiconductor switch is on, power is supplied to the load connected to the current suppression module, and the current suppression module suppresses the current rise rate and range. When the first semiconductor switch is off, a diode component is used to implement the freewheeling function, and the current suppression module suppresses the current fall rate and range.

[0078] Continue as Figure 4 As shown, the current suppression module 122 may include a fifth diode 1221 and an inductor 1223.

[0079] Reference Figure 4 The cathode of the fifth diode 1221 is connected to the other end of the first resistor 1212 and one end of the inductor 1223, respectively. The anode of the fifth diode 1221 can be connected to the other end of the load and the other end of the power supply, respectively. The other end of the inductor 1223 can be connected to the anode of the third diode 1121 and the anode of the fourth diode 1122, respectively.

[0080] The fifth diode, 1221, can be a freewheeling diode. When the freewheeling diode is connected in parallel across the inductor 1223, an induced electromotive force (EMF) is generated across the inductor 1223 when current flows through it. When the current disappears, the induced EMF generated by the inductor 1223 is dissipated through the circuit formed by the freewheeling diode and the inductor, thus protecting the safety of other components in the circuit. When the freewheeling diode is connected in reverse parallel across the inductor, the EMF across the inductor does not immediately disappear when the inductor is de-energized; the residual EMF is released through the freewheeling diode. Since the connection of the freewheeling diode is exactly in the same direction as the reverse EMF of the inductor, the reverse EMF is neutralized by the freewheeling diode in the form of current, thus protecting other circuit components. Therefore, this freewheeling diode is a diode with a relatively fast switching speed, such as a silicon controlled rectifier (SCR).

[0081] Specifically, when the voltage across the first resistor 1212 is less than a preset threshold, the drive control component outputs a disconnect control signal to the third terminal of the first semiconductor switch 1211. At this time, the inductor 1223 can discharge, and the induced electromotive force generated by the inductor 1223 is in the same direction as the current. The fifth diode 1221 neutralizes the induced electromotive force in the form of current, which can slow down the decrease of the inrush current. If the voltage across the first resistor 1212 is greater than the preset threshold, a conduction control signal is output to the third terminal of the first semiconductor switch 1211. At this time, the power supply supplies power to the inductor 1223, and the current in the circuit increases. The fifth diode 1221 neutralizes the current, which slows down the increase of the inrush current. Thus, by the high-speed conduction or disconnection of the first semiconductor switch 1211, the fifth diode and the inductor can be used to keep the inrush current in the power-on process within a small and stable range, avoiding fault misjudgment caused by the inrush current.

[0082] Optionally, when current flows out from the first diode 1111, it flows sequentially through the first diode 1111, the first semiconductor switch 1211, the first resistor 1212, the inductor 1223, and the fourth diode 1122, ultimately flowing to the cathode of the fourth diode 1122. Similarly, when current flows out from the second diode 1112, it flows sequentially through the second diode 1112, the first semiconductor switch 1211, the first resistor 1212, the inductor 1223, and the third diode 1121, finally flowing to the cathode of the third diode 1121. This allows for bidirectional current control, enabling current to flow in both directions.

[0083] Figure 5 A schematic diagram of the structure of the fifth bidirectional current control device provided in this embodiment of the present invention is shown below. Figure 5 As shown, the device may also include a semiconductor switching unit 13.

[0084] like Figure 5As shown, one end of the semiconductor switching unit 13 is connected to the first end of the full-bridge unit 11, and the other end of the semiconductor switching unit 13 is connected to the second end of the full-bridge unit 11. Specifically, one end of the semiconductor switching unit 13 can be connected to the cathode of the first diode 1111 and the cathode of the second diode 1112, respectively, and the other end of the semiconductor switching unit 13 can be connected to the anode of the third diode 1121 and the anode of the fourth diode 1122, respectively. The semiconductor switching unit 13 is a unit containing semiconductor devices and can also realize the circuit's conduction or shutdown based on current.

[0085] Continue to refer to Figure 5 The semiconductor switching unit 13 may include: a switch 131, a second semiconductor switch 132, a second resistor 133, a capacitor 134, and a metal oxide varistor 135.

[0086] Metal oxide varistors (MOVs) are variable resistors that adjust their resistance based on the applied voltage. If the voltage across the resistor increases, the resistance decreases, and vice versa. This characteristic helps protect circuits from high-voltage surges, so they are commonly used as surge protectors in electronic networks.

[0087] Optionally, one end of switch 131 can be connected to the first end of full-bridge unit 11. Specifically, one end of switch 131 can be connected to the cathode of the first diode 1111 and the cathode of the second diode 1112 in full-bridge unit 11. The other end of switch 131 can be connected to one end of the second semiconductor switch 132, one end of the second resistor 133 and one end of the metal oxide varistor 135, respectively.

[0088] Optionally, the other end of the second resistor 133 can be connected to one end of the capacitor 134, and the other end of the second semiconductor switch 132 can be connected to the other end of the capacitor 134, the other end of the metal oxide varistor 135, and the second end of the full-bridge unit 11, respectively. Specifically, the other end of the second semiconductor switch 132 can be connected to the other end of the capacitor 134, the other end of the metal oxide varistor 135, and the positive terminals of the third diode 1121 and the fourth diode 1122 in the full-bridge unit 11, respectively, via wires.

[0089] The second semiconductor switch can also be a semiconductor device.

[0090] Optionally, in a stable current state, i.e., not in the initial power-on phase, the semiconductor switching unit 13 can operate. When current is present, switch 131 and the second semiconductor switch 132 are turned on. Specifically, when current flows out from the first diode 1111, it flows sequentially through the first diode 1111, switch 131, the second semiconductor switch 132, and the fourth diode 1122, ultimately flowing to the negative terminal of the fourth diode 1122. When current flows out from the second diode 1112, it flows sequentially through the second diode 1112, switch 131, the second semiconductor switch 132, and the third diode 1121, finally flowing to the negative terminal of the third diode 1121. This enables bidirectional current control, allowing current to flow in both directions.

[0091] Optionally, when a fault current occurs, switch 131 and the second semiconductor switch 132 are disconnected. After the second semiconductor switch 132 is disconnected, the current is transferred and absorbed by the second resistor 133, capacitor 134 and metal oxide varistor 135. Then, when a fault current occurs, the second semiconductor switch 132 is turned off at high speed, which can protect the circuit.

[0092] This utility model also provides an electrical device, which may include the bidirectional current control device in the aforementioned specific embodiments.

[0093] The above are only specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A bidirectional current control device, characterized by, include: Full-bridge unit and combined inductor unit; The first end of the full-bridge unit is connected to the first end of the combined inductor unit, and the second end of the full-bridge unit is connected to the second end of the combined inductor unit; The third terminal of the full-bridge unit is used to connect to one end of the power supply, the fourth terminal of the full-bridge unit is used to connect to one end of the load, and the third terminal of the combined inductor unit is used to connect the other end of the load and the other end of the power supply. The full-bridge unit is used to control the direction of current flow in the circuit; The combined inductor unit is used to suppress the inrush current generated during the initial power-on phase.

2. The bidirectional current control device of claim 1, wherein, The full-bridge unit includes: a first bridge module and a second bridge module; The first end of the first bridge module is connected to the first end of the second bridge module. The first end of the first bridge module is used to connect to one end of the power supply. The second end of the first bridge module is connected to the first end of the combined inductor unit. The third end of the first bridge module is connected to the third end of the second bridge module. The third end of the first bridge module is used to connect to one end of the load. The second end of the second bridge module is connected to the second end of the combined inductor unit.

3. The bidirectional current control device of claim 2, wherein, The first bridge module includes: a first diode and a second diode; The anode of the first diode is connected to the first terminal of the second bridge module, and the anode of the first diode is used to connect to one end of the power supply. The cathode of the first diode is connected to the first terminal of the combined inductor unit and the cathode of the second diode, respectively. The positive terminal of the second diode is connected to the third terminal of the second bridge module, and the positive terminal of the second diode is used to connect one end of the load.

4. The bidirectional current control device according to claim 3, characterized in that, The second bridge module includes: a third diode and a fourth diode; The negative terminal of the third diode is connected to the positive terminal of the first diode, and the negative terminal of the third diode is used to connect to one end of the power supply. The positive terminal of the third diode is connected to the second end of the combined inductor unit and the positive terminal of the fourth diode, respectively. The negative terminal of the fourth diode is connected to the positive terminal of the second diode, and the negative terminal of the fourth diode is used to connect one end of the load.

5. The bidirectional current control device of claim 1, wherein, The combined inductor unit includes: a switch control module and a current suppression module; One end of the switch control module is connected to the negative terminal of the first diode and the negative terminal of the second diode, respectively, and the other end of the switch control module is connected to the first end of the current suppression module. The second terminal of the current suppression module is connected to the positive terminals of the third diode and the fourth diode, respectively, and the third terminal of the current suppression module is connected to the other end of the load and the other end of the power supply, respectively.

6. The bidirectional current control device of claim 5, wherein, The switch control module includes: a first semiconductor switch, a first resistor, and a drive control component; The first terminal of the first semiconductor switch is connected to the cathode of the first diode and the cathode of the second diode, respectively, and the second terminal of the first semiconductor switch is connected to the first terminal of the drive control component. The third terminal of the first semiconductor switch is connected to one end of the first resistor, and the other end of the first resistor is connected to the first terminal of the current suppression module. The second end of the drive control component is connected to one end of the first resistor, and the third end of the drive control component is connected to the second end of the first resistor.

7. The bidirectional current control device of claim 5, wherein, The current suppression module includes: a fifth diode and an inductor; The negative terminal of the fifth diode is connected to the other end of the first resistor and one end of the inductor, respectively, and the positive terminal of the fifth diode is connected to the other end of the load and the other end of the power supply, respectively. The other end of the inductor is connected to the positive terminal of the third diode and the positive terminal of the fourth diode, respectively.

8. The bidirectional current control device of claim 1, wherein, Also includes: Semiconductor switching unit; One end of the semiconductor switching unit is connected to the first end of the full-bridge unit, and the other end of the semiconductor switching unit is connected to the second end of the full-bridge unit.

9. The bidirectional current control device according to claim 8, characterized in that, The semiconductor switching unit includes: a switch, a second semiconductor switch, a second resistor, a capacitor, and a metal oxide varistor; One end of the switch is connected to the first end of the full-bridge unit, and the other end of the switch is connected to one end of the second semiconductor switch, one end of the second resistor, and one end of the metal oxide varistor, respectively. The other end of the second resistor is connected to one end of the capacitor; The other end of the second semiconductor switch is connected to the other end of the capacitor, the other end of the metal oxide varistor, and the second end of the full-bridge unit.

10. An electrical device, characterized by Includes the bidirectional current control device according to any one of claims 1-9.

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