Direct-current circuit breaker and reverse connection prevention control method of direct-current circuit breaker

Abstract

The invention provides a direct-current circuit breaker and a reverse connection prevention control method of the direct-current circuit breaker, and belongs to the technical field of direct-current power distribution. The reverse connection measuring unit collects real-time voltage of the wire inlet end and / or the wire outlet end of the direct-current circuit breaker in real time, determines a reverse connection recognition result based on the real-time voltage and sends the reverse connection recognition result to the control unit. The opening and closing trigger unit responds to user operation to generate a trigger signal and sends the trigger signal to the control unit; the control unit determines whether the trigger signal is a closing trigger signal or not, and if yes, whether closing is allowed or not is determined according to a reverse connection identification result; if yes, a closing instruction is sent to the execution unit, and the execution unit drives the contact unit to be closed according to the closing instruction; if not, a locking instruction is sent to the execution unit, so that the execution unit is in a locking state. According to the invention, functions of active detection and protection of the reverse connection state can be added in the DC circuit breaker, so that the safety and reliability of the DC circuit breaker are improved.

Description

Technical Field

[0001] This application relates to the field of DC power distribution technology, and more specifically, to a DC circuit breaker and a reverse connection prevention control method for the DC circuit breaker. Background Technology

[0002] With the widespread application of DC power distribution systems in new energy power generation, rail transit, data centers, and communication base stations, the safety and reliability of DC systems are receiving increasing attention. As the core protection component of DC power distribution systems, DC circuit breakers play a crucial role in rapidly interrupting the main circuit current under faults such as overload and short circuits, making them key components for ensuring the safe operation of the system. However, in practical engineering applications, especially during the construction, operation, maintenance, and emergency repair of DC power distribution systems, factors such as unclear wiring markings, non-standard operation, and misjudgments during repairs often lead to reversed polarity connections of DC circuit breakers. This can cause the complete failure of the circuit breaker's protection function, thereby inducing serious safety hazards and equipment failures.

[0003] In related technologies, the problem of reverse polarity of DC circuit breakers is often addressed in the following two ways: the first approach focuses on optimizing arc breaking after a fault to improve the arc breaking capacity of the DC circuit breaker; the second approach uses a polarity-matching mechanical structure to constrain the wiring of the DC circuit breaker to prevent reverse polarity of the DC circuit breaker.

[0004] However, when addressing reverse polarity connections of DC circuit breakers using related technologies, neither of the two methods mentioned above involves active detection and protection against reverse polarity, making it difficult to prevent reverse polarity from the outset. Furthermore, the mechanical result of polarity matching only provides protection against reverse polarity during the initial wiring stage of the DC circuit breaker; it cannot detect existing reverse polarity or address potential reverse polarity errors during later maintenance. Therefore, the lack of active detection and protection against reverse polarity in these technical solutions leads to lower safety and reliability of the DC circuit breaker. Summary of the Invention

[0005] The purpose of this application is to provide a DC circuit breaker and a reverse connection protection control method for the DC circuit breaker, which can add the function of active detection and protection of reverse connection state in the DC circuit breaker, thereby improving the safety and reliability of the DC circuit breaker.

[0006] The embodiments of this application are implemented as follows: A first aspect of this application provides a DC circuit breaker, which includes: a reverse connection measurement unit, a control unit, an execution unit, an opening and closing triggering unit, and a contact unit; The sampling terminal of the reverse connection measurement unit is connected to the input terminal and / or output terminal of the DC circuit breaker. The output terminal of the reverse connection measurement unit is connected to the first input terminal of the control unit. The first output terminal of the opening and closing trigger unit is connected to the second input terminal of the control unit. The output terminal of the control unit is connected to the input terminal of the execution unit. The output terminal of the execution unit and the second output terminal of the opening and closing trigger unit are both mechanically connected to the contact unit. The contact unit is deployed on the main circuit of the DC circuit breaker. The reverse connection measurement unit collects the real-time voltage of the incoming and / or outgoing terminals of the DC circuit breaker, determines the reverse connection identification result of the DC circuit breaker based on the real-time voltage, and sends the reverse connection identification result to the control unit. The opening and closing triggering unit responds to user operations by generating trigger signals and sends trigger signals to the control unit. The trigger signals include: opening trigger signals or closing trigger signals. The control unit determines whether the trigger signal is a closing trigger signal. If so, it determines whether closing is allowed based on the reverse connection identification result. If yes, the control unit sends a closing command to the execution unit, and the execution unit drives the contact unit to close according to the closing command; if no, the control unit sends a locking command to the execution unit to put the execution unit in a locked state.

[0007] As one possible implementation, the above-mentioned opening and closing triggering unit includes: a handle, which is mechanically linked to the contact unit, wherein the handle is configured such that when the DC circuit breaker is in the open state, the contact unit cannot be mechanically linked to close when the handle moves from the preset open position to the preset close position.

[0008] As one possible implementation, the handle is also configured such that when the DC circuit breaker is in the closed state, the mechanical linkage contact unit of the handle is disconnected when the handle moves from the preset closed position to the preset open position.

[0009] As one possible implementation, the above-mentioned opening and closing trigger unit further includes: a trigger detection circuit, which includes: a detection switch, the handle is connected to the second input terminal of the control unit via the detection switch, and the detection switch is a micro switch, Hall switch, photoelectric switch or self-reset switch.

[0010] As one possible implementation, the aforementioned reverse connection measurement unit includes: a voltage detection element; The real-time voltage of the DC circuit breaker's input and / or output terminals is collected in real time by a voltage detection element, and the real-time voltage is compared with a preset standard voltage threshold to determine whether the DC circuit breaker has reversed connection.

[0011] As one possible implementation, the aforementioned reverse connection measurement unit includes: an optical coupler detection unit; Based on the conduction characteristics of the optocoupler detection unit under the real-time voltage at the input and / or output terminals of the DC circuit breaker, it is determined whether the DC circuit breaker is reverse-connected.

[0012] As one possible implementation, the aforementioned DC circuit breaker also includes: a power supply unit; The first output terminal of the power supply unit is connected to the power supply terminal of the control unit, and the second output terminal of the power supply unit is connected to the power supply terminal of the execution unit.

[0013] As one possible implementation, the power supply unit includes: a rectifier and a power supply circuit; The input terminal of the rectifier is used to connect to an external auxiliary power supply. The input terminal of the power supply circuit is connected to the output terminal of the rectifier. The output terminal of the power supply circuit is connected to the power supply terminal of the control unit and the power supply terminal of the execution unit, respectively.

[0014] A second aspect of this application provides a reverse connection protection control method for a DC circuit breaker, the method being applied to the DC circuit breaker described in the first aspect above, the method comprising: The reverse connection measurement unit collects the real-time voltage of the incoming and / or outgoing terminals of the DC circuit breaker, determines the reverse connection identification result of the DC circuit breaker based on the real-time voltage, and sends the reverse connection identification result to the control unit. The opening and closing triggering unit responds to user operations by generating trigger signals and sends trigger signals to the control unit. The trigger signals include: opening trigger signals or closing trigger signals. The control unit determines whether the trigger signal is a closing trigger signal. If so, it determines whether closing is allowed based on the reverse connection identification result. If yes, the control unit sends a closing command to the execution unit, and the execution unit drives the contact unit to close according to the closing command; if no, the control unit sends a locking command to the execution unit to put the execution unit in a locked state.

[0015] As one possible implementation, determining whether to allow closing the circuit breaker based on the reverse connection identification result includes: If the reverse connection identification result received by the control unit is a reverse connection signal, the control unit determines that the contact unit is not allowed to close and generates a lockout command; If the reverse connection identification result received by the control unit is a positive connection signal or a reverse connection recovery signal, the control unit determines that the contact unit is allowed to close and generates an unlocking command.

[0016] The beneficial effects of the embodiments of this application include: This application provides a DC circuit breaker. A reverse connection measurement unit is connected to the incoming and / or outgoing terminals of the DC circuit breaker to collect real-time voltage data at both terminals. Based on the collected real-time voltage, the reverse connection measurement unit determines whether a reverse connection has occurred at the current moment and generates a reverse connection identification result, which is sent to the control unit. Under manual operation, the opening / closing trigger unit generates a trigger signal corresponding to the operator's manual action and sends this signal to the control unit. The control unit determines whether the received trigger signal is a closing trigger signal; if so, it... The system further determines whether the received reverse connection identification result is a reverse connection signal. If not, it determines that the DC circuit breaker can be closed at the current moment, and the control unit sends a closing command to the execution unit. Under the action of the closing command, the execution unit drives the trigger unit to perform a closing action. If yes, it determines that the DC circuit breaker cannot be closed at the current moment, and the control unit sends a locking command to the execution unit. Under the action of the locking command, the execution unit enters a locked state, and the contact unit does not perform any action. If the trigger signal received by the control unit is a tripping trigger signal, the control unit directly drives the contact unit to perform a tripping action through the execution unit. The reverse connection measurement unit provides an active reverse connection detection function for the DC circuit breaker. When a reverse connection is detected, it reports to the control unit. The control unit controls the execution unit to be in a locked state based on the reverse connection signal, so that the contact unit cannot close the DC circuit breaker under reverse connection conditions, thereby protecting the DC circuit breaker and downstream electrical equipment. This achieves the effect of adding active reverse connection detection and protection to the DC circuit breaker, thereby improving the safety and reliability of the DC circuit breaker. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a first type of DC circuit breaker provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a second type of DC circuit breaker provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a handle provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a third type of DC circuit breaker provided in the embodiments of this application; Figure 5This is a schematic diagram of the structure of a reverse-connection measurement unit provided in an embodiment of this application; Figure 6 This is a schematic diagram of another reverse-connection measurement unit provided in an embodiment of this application; Figure 7 A schematic diagram of a power supply unit provided in an embodiment of this application; Figure 8 A flowchart illustrating the reverse connection protection control method for a first type of DC circuit breaker provided in this application embodiment; Figure 9 A flowchart of a second method for preventing reverse connection of a DC circuit breaker provided in an embodiment of this application.

[0019] Reference numerals: 10: DC circuit breaker; 101: Reverse connection measurement unit; 1011: Voltage detection element; 1012: Optocoupler detection unit; 102: Control unit; 103: Execution unit; 104: Opening / closing trigger unit; 1041: Handle; 1042: Trigger detection circuit; 421: Detection switch; 105: Contact unit; 106: Power supply unit; 1061: Rectifier; 1062: Power supply circuit. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] 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.

[0023] A DC circuit breaker is a mechanical switching device used in DC circuits that can safely connect, carry, and disconnect current under normal operating conditions, and reliably disconnect fault current under specified abnormal circuit conditions.

[0024] As a core protection component of DC power distribution systems, DC circuit breakers provide overload protection, short-circuit protection, and fault isolation. Traditional DC circuit breakers are passive switches and lack polarity detection capabilities. If the power supply to the incoming and / or outgoing terminals of a DC circuit breaker is reversed, the circuit breaker will passively connect a circuit with incorrect polarity under operator intervention, leading to equipment damage, protection failure, and even serious safety accidents.

[0025] Currently, the reverse connection problem of DC circuit breakers is typically addressed in two ways. The first approach focuses on optimizing arc breaking after a fault, which improves the arc breaking capacity but neglects pre-emptive reverse connection prevention. The second approach uses a polarity-matching mechanical structure to constrain the DC circuit breaker wiring to prevent reverse polarity connection. However, this method only has limited effectiveness in the initial wiring stage and cannot identify the reverse connection status after wiring is complete. Furthermore, existing DC circuit breakers lack mandatory closing lockout protection. If operators fail to detect the reverse connection when closing the circuit breaker, the reverse polarity can cause arcing, contact welding, and other risks, potentially damaging electronic equipment. Therefore, existing DC circuit breakers lack proactive detection and protection against reverse connection, resulting in low safety and reliability.

[0026] To address this, this application provides a DC circuit breaker. By adding a reverse connection measurement unit to the incoming and / or outgoing terminals of the DC circuit breaker, the voltage at the incoming and / or outgoing terminals is collected in real time. Based on the collected voltage, the system determines whether a reverse connection has occurred at the current moment and sends the reverse connection identification result to the control unit. The opening / closing trigger unit responds to user operation, generates a corresponding manual trigger signal, and sends this signal to the control unit. The control unit generates a corresponding control command based on the received reverse connection identification result and the manual trigger signal, and sends it to the execution unit. Under the control command, the execution unit drives the contact unit to perform corresponding actions to connect or disconnect the main circuit current of the DC circuit breaker, thereby achieving reverse connection protection for the DC circuit breaker. This achieves the goal of adding active detection and protection against reverse connection in the DC circuit breaker, thereby improving the safety and reliability of the DC circuit breaker.

[0027] The following description, in conjunction with the accompanying drawings, provides a detailed explanation of the DC circuit breaker and its reverse connection control method provided in the embodiments of this application.

[0028] Figure 1 For a schematic diagram of a DC circuit breaker provided in this application, see [link to schematic diagram]. Figure 1This application provides a DC circuit breaker 10, which includes: a reverse connection measurement unit 101, a control unit 102, an execution unit 103, an opening and closing triggering unit 104, and a contact unit 105.

[0029] The reverse connection measurement unit 101 is used to measure whether the polarity of the power supply connected to the input and / or output terminals of the DC circuit breaker 10 is reversed, and sends the reverse connection identification result to the control unit 102. The reverse connection measurement unit 101 is specifically a voltage detection circuit, which is not specifically limited in this application.

[0030] Optionally, the operator can initiate opening, closing or reset trigger signals to the contact unit 105 through the opening and closing trigger unit 104. The opening and closing trigger unit 104 generates a corresponding trigger signal based on the operator's manual operation and sends the trigger signal to the control unit 102.

[0031] It should be noted that the opening and closing trigger unit 104 includes an external handle or button and a trigger detection circuit. The operator initiates the opening, closing or reset command by pushing the handle or pressing the button. The trigger detection circuit monitors the status of the handle or button in real time to generate a corresponding trigger signal.

[0032] Optionally, the control unit 102 generates a control command matching the current state of the DC circuit breaker 10 based on the reverse connection identification result fed back by the reverse connection measurement unit 101 and the trigger signal initiated by the operator through the opening and closing trigger unit 104, and sends the control command to the execution unit 103. The control unit 102 may specifically be a microcontroller, a central controller, etc., and this application does not specifically limit it.

[0033] Optionally, under the control command sent by the control unit 102, the execution unit 103 drives the contact unit 105 to open or close, so as to connect or disconnect the main circuit current in the DC circuit breaker 10. The execution unit 103 can be a DC motor, a stepper motor, an electromagnet, or a magnetic latching drive mechanism, etc., and this application does not specifically limit it.

[0034] The sampling terminal of the reverse connection measurement unit 101 is connected to the input terminal and / or output terminal of the DC circuit breaker 10. The output terminal of the reverse connection measurement unit 101 is connected to the first input terminal of the control unit 102. The first output terminal of the opening and closing trigger unit 104 is connected to the second input terminal of the control unit 102. The output terminal of the control unit 102 is connected to the input terminal of the execution unit 103. The output terminal of the execution unit 103 and the second output terminal of the opening and closing trigger unit 104 are both mechanically connected to the contact unit 105. The contact unit 105 is deployed on the main circuit of the DC circuit breaker 10.

[0035] Optionally, the sampling terminal of the reverse connection measurement unit 101 refers to the terminal on which the reverse connection measurement unit 101 collects voltage signals from the input terminal and / or output terminal of the DC circuit breaker 10. The reverse connection measurement unit 101 can collect the voltage signal from the input terminal of the DC circuit breaker 10 through the sampling terminal, or it can collect the voltage signal from the output terminal of the DC circuit breaker 10 through the sampling terminal. The reverse connection measurement unit 101 can also collect the voltage signals from both the input terminal and the output terminal of the DC circuit breaker 10 simultaneously through the sampling terminal. This application does not make any specific limitations on this.

[0036] The incoming terminal of the DC circuit breaker 10 refers to the terminal of the DC circuit breaker 10 connected to the power supply side, that is, the terminal into which current flows into the DC circuit breaker 10; the outgoing terminal of the DC circuit breaker 10 refers to the terminal of the DC circuit breaker 10 connected to the load side, that is, the terminal into which current flows out of the DC circuit breaker 10 and flows to the downstream electrical equipment.

[0037] Optionally, the reverse connection measurement unit 101 actively determines whether there is a polarity reversal at the input and / or output terminals of the DC circuit breaker 10 based on the voltage signal collected by the sampling terminal from the input and / or output terminals of the DC circuit breaker 10, and transmits the identification result to the first input terminal of the control unit 102 via the output terminal of the reverse connection measurement unit 101.

[0038] Specifically, the reverse connection measurement unit 101 compares the voltage signal collected by the sampling terminal with a preset standard voltage threshold to determine whether there is a polarity reversal at the input and / or output terminals of the DC circuit breaker 10. The preset standard voltage threshold can be 0V, 1.5V, etc., and this application does not specifically limit it.

[0039] Optionally, the split-open trigger unit 104 generates a corresponding manual trigger signal under the manual operation of the operator, and sends the manual trigger signal to the second input terminal of the control unit 102 via the first output terminal of the split-open trigger unit 104.

[0040] Optionally, the control unit 102 determines whether the DC circuit breaker 10 is currently in a reverse connection situation based on the reverse connection identification result output by the reverse connection measurement unit 101. At the same time, based on the manual trigger signal sent by the opening and closing trigger unit 104, it determines whether the operator has initiated a closing command.

[0041] Optionally, if the reverse connection identification result output by the reverse connection measurement unit 101 indicates that the DC circuit breaker 10 has a polarity reverse connection, the control unit 102 directly generates a lock-up command. At this time, regardless of whether the operator initiates a closing trigger signal through the opening and closing trigger unit 104, the control unit 102 always maintains the lock-up command to control the execution unit 103 to be in the lock-up state. The contact unit 105 is not affected by the closing trigger signal initiated by the opening and closing trigger unit 104 and remains in the open state.

[0042] Optionally, if the reverse connection identification result output by the reverse connection measurement unit 101 indicates that the DC circuit breaker 10 does not have a polarity reverse connection or the polarity reverse connection has been corrected, the control unit 102 will generate an unlocking command. At this time, after the control unit 102 receives the closing trigger signal initiated by the operator through the opening and closing trigger unit 104, the control unit 102 will generate a closing command. Under the action of the closing command, the execution unit 103 drives the contact unit 105 to perform the closing action.

[0043] Optionally, if the reverse connection identification result output by the reverse connection measurement unit 101 indicates that the DC circuit breaker 10 does not have a polarity reverse connection or the polarity reverse connection has been corrected, the control unit 102 will generate an unlocking command. After the control unit 102 does not receive a trigger signal initiated by the operator through the opening and closing triggering unit 104, the control unit 102 will maintain the current unlocking command and wait for the operator to initiate a trigger signal through the opening and closing triggering unit 104.

[0044] It should be noted that regardless of whether the DC circuit breaker 10 is reversed in polarity, the tripping trigger signal initiated by the operator through the tripping trigger unit 104 can force the contact unit 105 to trip.

[0045] Optionally, the control unit 102 generates a locking command, unlocking command, or closing command based on the reverse connection identification result and the trigger signal, and sends the locking command, unlocking command, or closing command to the input terminal of the execution unit 103 via the output terminal of the control unit 102. The execution unit 103 responds to the command sent by the control unit 102 to drive the actuating contact unit 105 to perform the corresponding action.

[0046] Optionally, the second output terminal of the opening and closing trigger unit 104 is mechanically connected to the contact unit 105. The opening and closing trigger unit 104 can directly mechanically link with the contact unit 105 through the second output terminal to drive the opening action of the contact unit 105. The closing trigger signal output by the opening and closing trigger unit 104 is subject to the control command received by the execution unit 103.

[0047] Specifically, if the opening and closing trigger unit 104 issues a closing trigger signal under the manual operation of the operator, but the reverse connection measurement unit 101 detects that the DC circuit breaker 10 is currently in a reverse polarity connection, the execution unit 103 will restrict the contact unit 105 from performing the closing action, thereby preventing equipment damage.

[0048] Optionally, the contact unit 105 is deployed on the main circuit of the DC circuit breaker 10. When the contact unit 105 performs a closing operation, the main circuit in the DC circuit breaker 10 is connected, and the main circuit current can flow from the incoming terminal of the DC circuit breaker 10 to the load connected to the outgoing terminal of the DC circuit breaker 10. When the contact unit 105 performs a opening operation, the main circuit in the DC circuit breaker 10 is disconnected, and the main circuit current cannot flow from the incoming terminal of the DC circuit breaker 10 to the load connected to the outgoing terminal of the DC circuit breaker 10.

[0049] It should be noted that the action of the contact unit 105 can be driven by the execution unit 103 and the opening and closing triggering unit 104 together, or it can be driven by the execution unit 103 or the opening and closing triggering unit 104 separately, depending on the specific operating conditions of the DC circuit breaker 10. This application does not make any specific limitations on this.

[0050] The reverse connection measurement unit 101 collects the real-time voltage of the incoming and / or outgoing terminals of the DC circuit breaker 10, determines the reverse connection identification result of the DC circuit breaker 10 based on the real-time voltage, and sends the reverse connection identification result to the control unit 102.

[0051] Optionally, real-time voltage refers to the actual voltage signal of the incoming and / or outgoing terminals of the DC circuit breaker 10 at the current moment, which is used to characterize the main circuit voltage signal in the DC circuit breaker 10.

[0052] Optionally, the reverse connection measurement unit 101 determines whether the DC circuit breaker 10 has a reverse polarity connection based on the collected real-time voltage, and generates a corresponding reverse connection identification result, which is then sent to the control unit 102. Specifically, the reverse connection identification result can be an analog electrical signal used to characterize the polarity determination result of the DC circuit breaker 10.

[0053] The opening and closing triggering unit 104 generates a trigger signal in response to user operation and sends the trigger signal to the control unit 102. The trigger signal includes: an opening trigger signal or a closing trigger signal.

[0054] Optionally, the opening / closing trigger unit 104 is used to receive the opening or closing operation of the operator. The opening or closing operation of the operator can be achieved by the operator manually operating the handle or button, or by the operator remotely operating the command initiated by the software program deployed on the terminal device. This application does not make specific limitations in this regard.

[0055] Optionally, the opening / closing trigger unit 104 generates an opening trigger signal or a closing trigger signal in response to user operation. The opening trigger signal is the trigger signal corresponding to the operator initiating the opening operation, and the closing trigger signal is the trigger signal corresponding to the operator initiating the closing operation.

[0056] Optionally, the opening / closing trigger unit 104 sends the generated trigger signal to the control unit 102 as an opening or closing request command.

[0057] The control unit 102 determines whether the trigger signal is a closing trigger signal. If so, it determines whether closing is allowed based on the reverse connection identification result.

[0058] Optionally, after receiving a trigger signal from the opening / closing trigger unit 104, the control unit 102 determines whether the user operation corresponding to the trigger signal is a closing operation. If the trigger signal received by the control unit 102 is an opening trigger signal, the control unit 102 directly controls the execution unit 103 to perform the opening action, or the contact unit 105 directly performs the opening action under the action of the opening / closing trigger unit 104. If the trigger signal received by the control unit 102 is a closing trigger signal, the control unit 102 needs to further determine whether the reverse connection identification result sent by the reverse connection measurement unit 101 is a reverse connection signal. If so, it is determined that the DC circuit breaker 10 has a reverse connection state at the current moment and cannot perform the closing action. The control unit 102 sends a lockout command to the execution unit 103. If not, it is determined that the DC circuit breaker 10 does not have a reverse connection state at the current moment and can perform the closing action. The control unit 102 sends a closing command to the execution unit 103.

[0059] If so, the control unit 102 sends a closing command to the execution unit 103, and the execution unit 103... The contact unit 105 is driven to close according to the closing command; otherwise, the control unit 102 sends a lock-up command to the execution unit 103 so that the execution unit 103 is in a locked state.

[0060] Optionally, if the control unit 102 receives a closing trigger signal from the opening and closing trigger unit 104, and the reverse connection measurement unit 101 determines that the DC circuit breaker 10 has not experienced a reverse connection at the current moment, then the control unit 102 sends a closing command to the execution unit 103, and the execution unit 103 drives the contact unit 105 to perform the closing action under the action of the closing command.

[0061] Optionally, if the control unit 102 receives a closing trigger signal from the opening / closing trigger unit 104, but the reverse connection measurement unit 101 determines that the DC circuit breaker 10 is in a reverse connection state at the current moment, then the control unit 102 sends a lockout command to the execution unit 103. Under the action of the lockout command, the execution unit 103 enters the lockout state, and the locking contact unit 105 does not perform the closing action. It should be noted that the control unit 102 can also drive the indicator light or alarm to issue a warning until the reverse connection state of the DC circuit breaker 10 is released, so as to inform the operator that the DC circuit breaker 10 is in a reverse connection state and does not meet the closing conditions.

[0062] Optionally, when the execution unit 103 receives the closing command issued by the control unit 102, the execution unit 103 drives the moving contact in the contact unit 105 to move so that the moving contact in the contact unit 105 can reliably contact the stationary contact, thereby connecting the main circuit in the DC circuit breaker 10.

[0063] Optionally, when the execution unit 103 receives the locking command issued by the control unit 102, the execution unit 103 enters the locking state. Specifically, the motor drive circuit may be disabled, the electromagnet may remain de-energized, or the mechanical locking pin may pop out. This application does not make specific limitations on this.

[0064] Optionally, once the execution unit 103 enters the locked state, even if the opening and closing trigger unit 104 sends a closing trigger signal again, the execution unit 103 cannot drive the contact unit 105 to perform the closing action, thus achieving dual electrical and mechanical interlocking.

[0065] It should be noted that the contact unit 105 is the main switching component of the DC circuit breaker 10, which typically includes a stationary contact, a moving contact, and an arc extinguishing device. The closing and opening actions of the contact unit 105 are directly or indirectly driven by the execution unit 103 to ensure the safe switching of the main circuit current.

[0066] It should also be noted that the locking command can be implemented in a way that is not limited to electrical locking, but can also be combined with a mechanical interlocking device so that the manual operation of the opening and closing triggering unit 104 in the reverse connection state cannot mechanically drive the closing action of the contact unit 105.

[0067] Furthermore, the driving method of the execution unit 103 is not limited to electric; it can also be driven by pneumatic, hydraulic, or other methods, as long as it can receive control commands and convert them into mechanical actions.

[0068] In this embodiment, a reverse connection measurement unit is connected to the incoming and / or outgoing terminals of the DC circuit breaker to collect the real-time voltage at the incoming and / or outgoing terminals. Based on the collected real-time voltage, the reverse connection measurement unit determines whether a reverse connection has occurred at the current moment and generates a reverse connection identification result, which is sent to the control unit. Under manual operation, the opening / closing trigger unit generates a trigger signal corresponding to the operator's manual operation and sends this trigger signal to the control unit. The control unit determines whether the received trigger signal is a closing trigger signal; if so, it further... The system determines whether the received reverse connection identification result is a reverse connection signal. If not, it determines that the DC circuit breaker can be closed at the current moment, and the control unit sends a closing command to the execution unit. Under the action of the closing command, the execution unit drives the trigger unit to perform a closing action. If yes, it determines that the DC circuit breaker cannot be closed at the current moment, and the control unit sends a locking command to the execution unit. Under the action of the locking command, the execution unit enters a locked state, and the contact unit does not perform any action. If the trigger signal received by the control unit is a tripping trigger signal, the control unit directly drives the contact unit to perform a tripping action through the execution unit. The reverse connection measurement unit provides an active reverse connection detection function for the DC circuit breaker. When a reverse connection is detected, it reports to the control unit. Based on the reverse connection signal, the control unit controls the execution unit to be in a locked state, so that the contact unit cannot close the DC circuit breaker under reverse connection conditions, thereby protecting the DC circuit breaker and downstream electrical equipment. This achieves the effect of adding active reverse connection detection and protection to the DC circuit breaker, thereby improving the safety and reliability of the DC circuit breaker.

[0069] In one alternative implementation, see [link to implementation details]. Figure 2 The opening and closing triggering unit 104 in the DC circuit breaker 10 provided in this application embodiment includes: a handle 1041, which is mechanically linked to the contact unit 105. The handle 1041 is configured such that when the DC circuit breaker 10 is in the open state, the handle 1041 cannot mechanically link the contact unit 105 to close when it moves from the preset open position to the preset close position.

[0070] In one alternative implementation, Figure 2 The handle 1041 shown is also configured such that when the DC circuit breaker 10 is in the closed state, and the handle 1041 moves from the preset closed position to the preset open position, the mechanical linkage contact unit 105 of the handle 1041 is disconnected.

[0071] Optionally, see Figure 3The handle 1041 of the DC circuit breaker 10 provided in this application is provided with a preset open position, a micro switch trigger position and a preset close position. The specific positions of the preset open position, the micro switch trigger position and the preset close position are preset by the user, and this application does not make specific limitations on them.

[0072] Optionally, the handle 1041 serves as the user's operating interface and is rotatably mounted on the housing of the DC circuit breaker 10. It has clearly marked preset open and preset close positions. When the operator moves the handle 1041 to the preset open position, it indicates that the operator has initiated a open trigger signal to the contact unit 105 via the handle 1041; when the operator moves the handle 1041 to the preset close position, it indicates that the operator has initiated a close trigger signal to the contact unit 105 via the handle 1041. The preset open position and the preset close position are preset by the user.

[0073] Optionally, when the operator performs a manual closing operation, the handle 1041 is moved from the preset opening position to the preset closing position. During this movement, when the handle 1041 reaches a predetermined trigger position (this position can be a point in the travel or the closing position itself), its mechanical structure will drive the detection switch in the trigger detection circuit 1042 to operate, and the control unit 102 will drive the execution unit 103 to perform the closing operation.

[0074] It should be noted that the closing process of the handle 1041 is as follows: the handle 1041 moves from the preset open position to the preset close position, triggering the detection switch to operate. However, at this time, the contact unit 105 is not closed. If the control unit 102 is not reversed, the execution unit 103 is driven to close the contact unit 105, and the handle 1041 is locked in the close position at the same time. If the control unit 102 is reversed, the closing command is not executed, the contact unit 105 is not closed, and when the handle 1041 is released, the handle 1041 is automatically released and returns to the open position.

[0075] It should also be noted that the opening process of the handle 1041 is as follows: when the handle 1041 moves from the preset closing position to the preset opening position, the moving contact in the mechanical linkage contact unit 105 of the handle 1041 moves from the closed position to the opening position.

[0076] In this embodiment of the application, by converting manual operation into a pre-conductive signal, a closing mode of manual triggering and electronic control execution is realized. This makes it possible for the control unit to perform safety checks such as reverse connection determination after receiving a closing request, thereby fundamentally preventing accidental closing under fault conditions such as reverse power connection and improving the safety and intelligence level of operation.

[0077] In one alternative implementation, see [link to implementation details]. Figure 2 and Figure 4 The DC circuit breaker 10 provided in this application embodiment further includes a trigger detection circuit 1042. The handle 1041 is connected to the second input terminal of the control unit 102 via a detection switch 421. The trigger detection circuit 1042 includes a detection switch 421, which is a micro switch, Hall switch, photoelectric switch or self-reset switch.

[0078] Optionally, the trigger detection circuit 1042 is fixedly installed inside the DC circuit breaker 10. It includes at least one detection switch. The handle 1041 is connected to the triggering component of the detection switch in the trigger detection circuit 1042 through an internal mechanical structure such as a rotating shaft, cam, or connecting rod, so that the rotation of the handle 1041 can directly drive or change the state of the detection switch.

[0079] Optionally, when the operator performs a manual closing operation, the handle 1041 is moved from the preset opening position to the preset closing position. During this movement, when the handle 1041 reaches a predetermined trigger position (which can be a point in the travel or the closing position itself), its mechanical structure will drive the detection switch in the trigger detection circuit 1042 to operate.

[0080] Optionally, the trigger detection circuit 1042 is configured to generate a high-level or low-level switching closing trigger signal in response to the action of this detection switch, and send the closing trigger signal to the second input terminal of the control unit 102 to convey the user's intention to close the circuit to the control unit 102.

[0081] Optionally, the trigger detection circuit 1042 can also be a non-contact detection circuit or an independent button detection circuit. The non-contact detection circuit uses a magnet on the handle 1041 and a Hall switch or reed switch at the corresponding travel position. When the handle 1041 rotates, causing the magnet to pass the Hall switch or reed switch, a corresponding trigger signal is generated through magnetic induction. The independent button detection circuit completely decouples the handle 1041 from the signal generation mechanism. The trigger detection circuit 1042 is configured as an independent closing button. When the operator performs the closing action, they directly press the closing button to generate an electrical signal, and the handle 1041 can be automatically driven to the preset closing position by the execution unit 103.

[0082] Optionally, the detection switch 421 in the trigger detection circuit 1042 serves as a sensing element that converts the mechanical position or action of the handle 1041 into an electrical signal, and its selection has various feasible implementation schemes. Among them, the detection switch 421 can be any one or a combination of a micro switch, a Hall switch, a photoelectric switch, or a self-resetting switch.

[0083] Optionally, when the detection switch 421 is a micro switch, it is typically connected to the shaft or linkage component of the handle 1041 via a mechanical structure. Specifically, a cam can be provided on the shaft of the handle 1041, or a pressure rod can be provided on the linkage rod. When the handle 1041 moves from the preset open position to the preset closed position, the cam or pressure rod moves accordingly and presses the actuator arm of the micro switch at a predetermined position of the stroke (such as the preset closed position), causing the internal contact state to switch instantaneously (such as from normally open to closed), thereby generating a clear level transition signal as a closing trigger signal.

[0084] Optionally, when the detection switch 421 is a Hall switch, a small permanent magnet is usually installed at a specific position of the handle 1041, and a Hall sensor is set at the corresponding fixed position. When the handle 1041 is rotated so that the permanent magnet approaches the Hall sensor to a preset distance, the sensor output level flips, generating a closing trigger signal.

[0085] Optionally, when the detection switch 421 is a photoelectric switch, a light shield is usually provided on the handle 1041, or a reflective material is applied to a specific position. When the handle 1041 moves to the preset closing position, the light shield cuts into the light path or the reflective surface enters the detection area, causing the state of the photoelectric receiver to change, and then outputs a trigger signal.

[0086] Optionally, when the detection switch 421 is a self-resetting switch, the operator's operation of the handle 1041 can indirectly or directly trigger the self-resetting switch. For example, the movement of the handle 1041 can briefly press the self-resetting switch through an intermediate mechanism. Once the self-resetting switch is triggered, it automatically returns to its initial state under the action of its own spring, and at the same time outputs an instantaneous pulse signal as a closing trigger signal.

[0087] In this application embodiment, by specifying multiple selectable types of detection switches, a high degree of flexibility is provided for the design of the trigger detection circuit, enabling the DC circuit breaker provided by this application to be compatible with diverse manufacturing schemes and user operating habits, thereby enhancing the applicability of the product.

[0088] In one alternative embodiment, see Figure 5 The reverse connection measurement unit 101 in the DC circuit breaker 10 provided in this application embodiment includes: voltage detection element 1011.

[0089] The voltage detection element 1011 collects the real-time voltage at the input and / or output terminals of the DC circuit breaker 10, and compares the real-time voltage with a preset standard voltage threshold to determine whether the DC circuit breaker 10 has reversed connection.

[0090] Optionally, the voltage detection element 1011 can be implemented by an isolated voltage sensor and a comparator. The voltage sensor is used to safely and accurately extract voltage signals from the incoming and / or outgoing terminals of the DC circuit breaker 10, and the comparator is used to compare the voltage signal collected by the voltage sensor with a preset standard voltage threshold to determine whether the DC circuit breaker is in a reverse connection state at the current moment.

[0091] Specifically, if the voltage signal collected by the voltage sensor is greater than or equal to the preset standard voltage threshold, the voltage signal collected by the voltage sensor is determined to be positive; if the voltage signal collected by the voltage sensor is less than the preset standard voltage threshold, the voltage signal collected by the voltage sensor is determined to be negative.

[0092] For example, if the input terminal A1 of the DC circuit breaker 10 should be connected to the positive power supply, but the voltage signal collected by the voltage sensor from the input terminal A1 is negative, it indicates that the DC circuit breaker 10 is reverse-connected, and the reverse connection identification result sent by the reverse connection measurement unit 101 to the control unit 102 is a reverse connection signal.

[0093] For example, if the output terminal B2 of the DC circuit breaker 10 should originally output a negative power supply signal to the downstream electrical equipment, but the voltage signal collected by the voltage sensor from the output terminal B2 is negative, it indicates that the DC circuit breaker 10 has not been reverse-connected, and the reverse connection identification result sent by the reverse connection measurement unit 101 to the control unit 102 is a positive connection signal.

[0094] In one alternative embodiment, see Figure 6 The reverse connection measurement unit 101 in the DC circuit breaker 10 provided in this application embodiment includes: an optocoupler detection unit 1012.

[0095] Based on the conduction characteristics of the optocoupler detection unit 1012 under the real-time voltage at the input and / or output terminals of the DC circuit breaker 10, it is determined whether the DC circuit breaker 10 is reverse-connected.

[0096] Optionally, the optocoupler detection unit 1012 typically includes: an optocoupler element, a current-limiting resistor, and a pull-up or pull-down resistor. The input terminal of the optocoupler element is connected across the two terminals whose polarity needs to be detected (such as the input terminals A1 and A2 of a DC circuit breaker) via the current-limiting resistor. The output terminal of the optocoupler element is connected to the control unit 102 as the detection signal output point.

[0097] Specifically, the optocoupler can be implemented by an optocoupler with unidirectional conductivity, whose input end is the anode of a light-emitting diode and whose output end is the collector or emitter of a phototransistor.

[0098] Optionally, the real-time voltage at the input and / or output terminals of the DC circuit breaker 10 is applied to the input terminal of the optocoupler through a current-limiting resistor. If the polarity of the real-time voltage is consistent with the forward conduction direction of the optocoupler, the LED in the optocoupler conducts in the forward direction and emits light, and the phototransistor is saturated and conducts under the action of the light emitted by the LED. The output terminal of the optocoupler is pulled down to a low level, and the DC circuit breaker is not currently reverse-connected. If the polarity of the real-time voltage is inconsistent with the forward conduction direction of the optocoupler, the LED in the optocoupler is reverse-cut off and does not emit light, the phototransistor is in the cut-off state, the output terminal of the optocoupler remains at a high level, and the DC circuit breaker is currently reverse-connected.

[0099] The resistance value of the current-limiting resistor needs to be calculated based on the measured voltage range of the input and / or output terminals of the DC circuit breaker and the rated operating current of the LED in the optocoupler element, to ensure that the LED can work normally under normal polarity voltage and is not damaged under reverse voltage or overvoltage conditions.

[0100] It should be noted that if the reverse connection measurement unit 101 in the DC circuit breaker 10 is connected to both the input and output terminals of the DC circuit breaker 10 at the same time, the DC circuit breaker 10 will be in a reverse connection state regardless of whether the voltage signal at the input terminal of the DC circuit breaker 10 has the opposite polarity or the voltage signal at the output terminal of the DC circuit breaker 10 has the opposite polarity.

[0101] In one alternative implementation, see [link to implementation details]. Figure 7 The DC circuit breaker 10 provided in this application embodiment also includes a power supply unit 106.

[0102] The first output terminal of the power supply unit 106 is connected to the power supply terminal of the control unit 102, and the second output terminal of the power supply unit 106 is connected to the power supply terminal of the execution unit 103.

[0103] Optionally, the power supply unit 106 is responsible for converting and distributing externally input electrical energy to provide the necessary operating power for the control, detection, and execution of the entire DC circuit breaker 10. Specifically, it is used to establish a stable and isolated operating voltage source for the electronic and electrical components in the DC circuit breaker 10.

[0104] Optionally, the input terminal of the power supply unit 106 is used to connect to an external auxiliary power supply. The external auxiliary power supply can be the power supply connected to the input terminal of the DC circuit breaker 10, or it can be an independent auxiliary power supply. This application does not make any specific limitation on this.

[0105] Optionally, the power supply unit 106 is used to perform necessary transformations (such as step-down, rectification, filtering, and voltage regulation) on the electrical energy provided by the external auxiliary power supply to output one or more stable DC voltages.

[0106] Optionally, the first output terminal of the power supply unit 106 is connected to the power supply terminal of the control unit 102, and the voltage output from the first output terminal of the power supply unit 106 is used to power the control unit 102 to ensure the accuracy of signal processing and decision-making.

[0107] Optionally, the second output terminal of the power supply unit 106 is connected to the power supply terminal of the execution unit 103. The voltage output from the second output terminal of the power supply unit 106 is used to power the execution unit 103 to provide sufficient mechanical power to directly drive the motor, electromagnet, and other actuators.

[0108] An alternative implementation method is described in [reference]. Figure 7 The power supply unit 106 in the DC circuit breaker 10 provided in this application embodiment includes: a rectifier 1061 and a power supply circuit 1062.

[0109] The input terminal of rectifier 1061 is used to connect to an external auxiliary power supply. The input terminal of power circuit 1062 is connected to the output terminal of rectifier 1061. The output terminal of power circuit 1062 is connected to the power supply terminal of control unit 102 and the power supply terminal of execution unit 103, respectively.

[0110] Optionally, the rectifier 1061 serves as the pre-processing unit of the power supply unit 106. The input terminal of the rectifier 1061 is connected to an external auxiliary power supply to convert the electrical energy provided by the external auxiliary power supply into DC power with a specific polarity or to perform polarity correction on the electrical energy provided by the external auxiliary power supply. This application does not make specific limitations on this.

[0111] Optionally, the power supply circuit 1062 serves as the post-processing unit of the power supply unit 106. The input terminal of the power supply circuit 1062 is connected to the output terminal of the rectifier 1061. The power supply circuit 1062 converts, stabilizes, and distributes the rectified DC power to supply power to the control unit 102 and the execution unit 103.

[0112] Specifically, the power supply circuit 1062 divides the rectified DC power output from the rectifier 1061 into two DC power paths. One path is a lower voltage, higher precision DC power, which is output to the control unit 102 via the first output terminal of the power supply circuit 1062 to provide the operating voltage for the control unit 102. The other path is a higher voltage DC power with a certain power output capability, which is output to the execution unit 103 via the second output terminal of the power supply circuit 1062 to provide the execution power for the execution unit 103.

[0113] In one optional embodiment, the power supply circuit 1062 in the DC circuit breaker 10 provided in this application includes either an isolated power supply circuit or a non-isolated power supply circuit.

[0114] Optionally, electrical isolation between the input and output sides of an isolated power supply circuit is achieved through components such as transformers and optocouplers. Isolated power supply circuits are often implemented using switching power supply topologies with isolation transformers, such as flyback converters, forward converters, or push-pull converters. In this circuit, the DC bus voltage after rectification in the front stage is converted into high-frequency AC power, coupled to the secondary side through the isolation transformer, and then rectified and filtered by the secondary side to obtain the required stable DC output.

[0115] It should be noted that the isolated power supply circuit can effectively block common-mode interference, surges and potential differences on the main circuit of the DC circuit breaker 10 from entering the low-voltage control circuit, greatly improving the anti-interference capability and reliability of the control unit 102 and the entire measurement and logic system.

[0116] Optionally, a non-isolated power supply circuit has a direct electrical connection between its input and output sides. Non-isolated power supply circuits are often implemented using buck converters, boost converters, or buck-boost converters. Specifically, non-isolated power supply circuits directly reduce the higher input DC voltage to the required lower output voltage and achieve precise voltage regulation through chopping by switching transistors and energy storage filtering by inductors and capacitors.

[0117] The following is an embodiment of the reverse connection prevention control method for a DC circuit breaker provided in this application. Its implementation principle and process are exactly the same as the specific embodiment of the DC circuit breaker described above, and will not be repeated here.

[0118] Figure 8 This application provides a reverse connection protection control method for a DC circuit breaker, which is applied to the aforementioned DC circuit breaker 10. See [link to relevant documentation]. Figure 8 The method includes: S801, the reverse connection measurement unit collects the real-time voltage of the incoming and / or outgoing terminals of the DC circuit breaker in real time, determines the reverse connection identification result of the DC circuit breaker based on the real-time voltage, and sends the reverse connection identification result to the control unit; S802, the opening and closing triggering unit responds to user operation, generates a trigger signal, and sends the trigger signal to the control unit. The trigger signal includes: opening trigger signal or closing trigger signal. S803: The control unit determines whether the trigger signal is a closing trigger signal. If so, it determines whether closing is allowed based on the reverse connection identification result. S804 If so, the control unit sends a closing command to the execution unit, and the execution unit drives the contact unit to close according to the closing command; S805. If not, the control unit sends a lock command to the execution unit to put the execution unit in a locked state.

[0119] In one alternative implementation, see [link to implementation details]. Figure 9The operation of "determining whether to allow closing based on the reverse connection identification result" in step S803 above can be specifically as follows: S901. If the reverse connection identification result received by the control unit is a reverse connection signal, the control unit determines that the contact unit is not allowed to close and generates a lockout command. S902. If the reverse connection identification result received by the control unit is a positive connection signal or a reverse connection recovery signal, the control unit determines that the contact unit is allowed to close and generates an unlocking command.

[0120] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0121] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A DC circuit breaker, characterized in that, The DC circuit breaker includes: a reverse connection measurement unit, a control unit, an execution unit, an opening and closing triggering unit, and a contact unit; The sampling terminal of the reverse connection measurement unit is connected to the input terminal and / or output terminal of the DC circuit breaker. The output terminal of the reverse connection measurement unit is connected to the first input terminal of the control unit. The first output terminal of the opening and closing trigger unit is connected to the second input terminal of the control unit. The output terminal of the control unit is connected to the input terminal of the execution unit. The output terminal of the execution unit and the second output terminal of the opening and closing trigger unit are both mechanically connected to the contact unit. The contact unit is deployed on the main circuit of the DC circuit breaker. The reverse connection measurement unit collects the real-time voltage of the incoming and / or outgoing terminals of the DC circuit breaker, determines the reverse connection identification result of the DC circuit breaker based on the real-time voltage, and sends the reverse connection identification result to the control unit. The opening and closing triggering unit generates a trigger signal in response to user operation and sends the trigger signal to the control unit. The trigger signal includes: an opening trigger signal or a closing trigger signal. The control unit determines whether the trigger signal is a closing trigger signal. If so, it determines whether closing is allowed based on the reverse connection identification result. If yes, the control unit sends a closing command to the execution unit, and the execution unit drives the contact unit to close according to the closing command; if no, the control unit sends a locking command to the execution unit to put the execution unit in a locked state.

2. The DC circuit breaker according to claim 1, characterized in that, The opening and closing triggering unit includes a handle, which is mechanically linked to the contact unit. The handle is configured such that when the DC circuit breaker is in the open state and the handle moves from a preset open position to a preset close position, it cannot mechanically link the contact unit to close.

3. The DC circuit breaker according to claim 2, characterized in that, The handle is also configured such that when the DC circuit breaker is in the closed state, and the handle moves from a preset closed position to a preset open position, the handle mechanically links the contact unit to disconnect.

4. The DC circuit breaker according to claim 2, characterized in that, The opening and closing trigger unit further includes a trigger detection circuit, which includes a detection switch. The handle is connected to the second input terminal of the control unit via the detection switch. The detection switch is a micro switch, Hall switch, photoelectric switch, or self-reset switch.

5. The DC circuit breaker according to claim 1, characterized in that, The reverse connection measurement unit includes: a voltage detection element; The voltage detection element collects the real-time voltage at the input and / or output terminals of the DC circuit breaker in real time, and compares the real-time voltage with a preset standard voltage threshold to determine whether the DC circuit breaker is reverse-connected.

6. The DC circuit breaker according to claim 1, characterized in that, The reverse connection measurement unit includes: an optical coupler detection unit; Based on the conduction characteristics of the optocoupler detection unit under the real-time voltage at the input and / or output terminals of the DC circuit breaker, it is determined whether the DC circuit breaker is reverse-connected.

7. The DC circuit breaker according to claim 1, characterized in that, The DC circuit breaker also includes: a power supply unit; The first output terminal of the power supply unit is connected to the power supply terminal of the control unit, and the second output terminal of the power supply unit is connected to the power supply terminal of the execution unit.

8. The DC circuit breaker according to claim 7, characterized in that, The power supply unit includes: a rectifier and a power supply circuit; The input terminal of the rectifier is used to connect to an external auxiliary power supply. The input terminal of the power supply circuit is connected to the output terminal of the rectifier. The output terminal of the power supply circuit is connected to the power supply terminal of the control unit and the power supply terminal of the execution unit, respectively.

9. A reverse connection protection control method for a DC circuit breaker, characterized in that, The method is applied to the DC circuit breaker according to any one of claims 1-8, and the method includes: The reverse connection measurement unit collects the real-time voltage of the incoming and / or outgoing terminals of the DC circuit breaker, determines the reverse connection identification result of the DC circuit breaker based on the real-time voltage, and sends the reverse connection identification result to the control unit. The opening and closing triggering unit responds to user operations by generating a trigger signal and sends the trigger signal to the control unit. The trigger signal includes either an opening trigger signal or a closing trigger signal. The control unit determines whether the trigger signal is a closing trigger signal. If so, it determines whether closing is allowed based on the reverse connection identification result. If yes, the control unit sends a closing command to the execution unit, and the execution unit drives the contact unit to close according to the closing command; if no, the control unit sends a locking command to the execution unit to put the execution unit in a locked state.

10. The reverse connection prevention control method for a DC circuit breaker according to claim 9, characterized in that, The step of determining whether to allow closing the circuit breaker based on the reverse connection identification result includes: If the reverse connection identification result received by the control unit is a reverse connection signal, the control unit determines that the contact unit is not allowed to close and generates a lockout command. If the reverse connection identification result received by the control unit is a positive connection signal or a reverse connection recovery signal, the control unit determines that the contact unit is allowed to close and generates an unlocking command.

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