Alternating current and direct current integrated shore power box safety control circuit

Abstract

The utility model provides an AC / DC integrated shore power box safety control circuit, comprising a power supply module suitable for accessing commercial power subjected to transformation conversion and used for providing electric energy; the first switch is suitable for being connected with the power supply module and controlling connection or disconnection of the power supply module; at least one load branch and at least one load control branch; the load branches are in one-to-one correspondence with the load control branches; two ends of the load control branch and the load branch are respectively connected to two ends of the power supply module; the load control branch controls the on-off of the corresponding load branch according to a ship communication state and a first set state; the load branch further comprises at least one connector interface for connection with a ship onboard interface via a cable. According to the technical scheme of the utility model, the safety control circuit meets the requirements of different ships, reduces the repeated investment of a shore power system, makes full use of the shore power berth of a port, and improves the use efficiency of shore power equipment on the premise of meeting the standards of uncharged plugging and the like.

Description

Technical Field

[0001] This utility model relates to the field of power control, specifically to a safety control circuit for an integrated AC / DC shore power box. Background Technology

[0002] Traditional ships use heavy fuel oil, a major source of carbon dioxide emissions. Replacing it with clean energy can not only reduce carbon emissions but also reduce vibration and noise, and prevent oil pollution. The core of achieving a green transformation for ships lies in the application of green power technologies. In recent years, with the promotion of new energy applications in China, the development of electric ships has been rapid.

[0003] For ships berthing, shore power is the most feasible solution to achieve zero carbon emissions. Shore power refers to ships berthing in port shutting down their own auxiliary generators and instead using clean energy provided by the port to power their main onboard systems. By adopting shore power to replace traditional ship diesel auxiliary engine power generation, environmental pollution such as noise, black smoke, and exhaust fumes caused by diesel fuel power generation can be effectively reduced, thus reducing ship air pollutant emissions and protecting the aquatic ecosystem.

[0004] The shore power solution requires the construction of charging and swapping facilities, or shore power systems, along the coast of ports of call. These systems convert the high voltage (e.g., 10kV / 50Hz) of the port's power grid into a voltage level suitable for the ship using transformers and converters, and finally deliver it to a power supply box located on the quay. After connecting the shore power box to the ship's onboard interface via cable plugs, and ensuring that the voltage, frequency, and phase sequence meet the requirements, the busbar interconnection switch is closed, allowing power to be transmitted to the docked ship via the shore power system, thus enabling charging and swapping.

[0005] In recent years, my country's maritime authorities have issued a series of standards and specifications for the construction of shore power systems, regulating the connection between shore power and ship power. Among these, the "Notification of Amendments to the 2018 Rules for Statutory Inspection of Ships and Offshore Facilities - Technical Rules for Statutory Inspection of Inland Waterway Vessels" explicitly requires that "ship power and shore power should be connected via plugs and sockets… and it must be ensured that plugging and unplugging is not allowed while the power is on." Similar requirements are also found in the IEC 80005-3:2016 international standard, which sets forth a series of specifications for the plugs and sockets used for connection.

[0006] Given that inland waterways account for 95% of domestic shipping in my country, and most small and medium-sized vessels operate only domestically, their requirements for shore power supply capacity are not high. The connection and control mechanisms required by international standards are overly complex and costly to implement along inland waterways. A safe and convenient AC / DC integrated shore power box control circuit that meets the power supply requirements of small and medium-sized vessels, conforms to connection standards and specifications, and offers safe and easy operation would facilitate the promotion and implementation of shore power systems in inland waterways, thereby contributing to the green transformation of shipping. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model proposes an AC / DC integrated shore power box safety control circuit. Under the premise of complying with standards and specifications such as ensuring that plugging and unplugging is not done while powered on, it can meet the needs of different types of ships, reduce the repeated investment in shore power charging facilities, make full use of port shore power berths, and improve the utilization efficiency of shore power facilities.

[0008] According to certain embodiments of the AC / DC integrated shore power box safety control circuit of this utility model, the safety control circuit includes at least: a power module adapted to connect to mains power after voltage conversion for providing electrical energy; a first switch adapted to connect to the power module to control the connection or disconnection of the power module; at least one load branch and at least one load control branch; wherein the load branch and the load control branch correspond one-to-one; the two ends of the load control branch are respectively connected to the two ends of the power module, and control the connection or disconnection of the corresponding load branch according to the ship's connection status and a first set state; the two ends of the load branch are respectively connected to the two ends of the power module, and the load branch further includes at least one connector interface for connecting to the ship's onboard interface via a cable.

[0009] Furthermore, the load control branch includes at least: a status feedback switch, adapted to turn on or off according to the ship's connectivity status and a first set status; the load branch corresponding to the load control branch includes at least: a control switch connected in series with the connector interface, adapted to close when the status feedback switch is off.

[0010] Furthermore, the status feedback switch adopts a normally closed design, and the status feedback switch is disconnected only when the device is in communication with the ship and the first set state is open.

[0011] Furthermore, the status feedback switch includes: a connection status feedback switch and a first setting status switch; wherein, the connection status feedback switch and the first setting status switch are connected in parallel; when connected to a ship, the connection status feedback switch is disconnected; when the first setting status is on, the first setting status switch is disconnected.

[0012] Furthermore, the load control branch also includes an inverter, which is connected in series with the status feedback switch; the control switch further includes a reed switch; wherein the output terminal of the inverter is connected to the input terminal of the reed switch.

[0013] Furthermore, the load control branch also includes a relay coil, which is connected in series with the status feedback switch, and the auxiliary contact of the relay coil is connected to the corresponding load branch, so that the load branch is turned on when the status feedback switch is turned off.

[0014] Furthermore, the load branch also includes an undervoltage trip, adapted to be connected in series with the control switch.

[0015] Furthermore, the safety control circuit includes: an interlocking switch disposed between any at least two load control branches, such that the load branches corresponding to the connected load control branches can be powered together, and when any one of them is hot-plugged, the other one or more load branches that are interlocked for power supply are simultaneously disconnected.

[0016] Furthermore, the at least two load control branches are located in the same shore power box.

[0017] Furthermore, the at least two load control branches are located in different shore power boxes.

[0018] In each embodiment of the aforementioned AC / DC integrated shore power box safety control circuit, one or more sets of load control branches and load branches are set up in parallel and correspond one-to-one. The load control branches control the conduction or cutoff of the load branches. By setting dual feedback of connection state and first set state in the load control branches, the load control branch is turned off only when the ship is in the connection state and the first set state is on, thus turning on the load branch. Correspondingly, the ship connected to the load branch can be charged, improving the safety of power supply. Because each load branch can supply power independently, when different load branches in the same shore power box are used to independently supply power to different ships, if any one ship leaves port, the other ships charging through the same shore power box will not be affected, ensuring the independence of power supply.

[0019] Furthermore, some of the above embodiments interlock switches are installed between any two load control branches in the same or different shore power boxes to interlock control multiple load branches. This allows the load branches corresponding to the connected load control branches to be jointly powered when necessary, thereby making full use of the port shore power berths, meeting the needs of different types of vessels, and improving the efficiency of shore power facilities. In addition, the load branch connected to the vessel can only meet the switch closing conditions after all the required parallel plugs are plugged in. Moreover, when any one of the branches is plugged in while energized, the remaining one or more interlocked load branches are simultaneously disconnected, improving power supply safety. Attached Figure Description

[0020] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0021] Figure 1 This is a circuit diagram illustrating one embodiment of the safety control circuit for the AC / DC integrated shore power box of this utility model.

[0022] Figure 2 This is a circuit diagram of one embodiment of the load control branch in the safety control circuit of the AC / DC integrated shore power box of this utility model.

[0023] Figure 3 This is a circuit diagram illustrating one embodiment of the status feedback switch in the safety control circuit of the AC / DC integrated shore power box of this utility model.

[0024] Figure 4 This is a circuit diagram of one embodiment of the load control branch in the safety control circuit of the AC / DC integrated shore power box of this utility model.

[0025] Figure 5 This is a circuit diagram of one embodiment of the load control branch in the safety control circuit of the AC / DC integrated shore power box of this utility model.

[0026] Figure 6 This is a circuit diagram of one embodiment of the load control branch in the safety control circuit of the AC / DC integrated shore power box of this utility model.

[0027] Figure 7 This is a circuit diagram illustrating one embodiment of the safety control circuit for the AC / DC integrated shore power box of this utility model.

[0028] Figure 8 This is a circuit diagram illustrating one embodiment of the safety control circuit for the AC / DC integrated shore power box of this utility model. Detailed Implementation

[0029] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0030] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its normal operating state, for example, referring to... Figure 1 In the drawing orientation, "inner" and "outer" refer to those relative to the outline of the device. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] According to certain embodiments of this disclosure, the safety control circuit for an integrated AC / DC shore power box can be configured in one or more shore power boxes. Each shore power box is independent and not connected to others. Based on various embodiments of the safety control circuit of this disclosure, when at least two load branches of one or more shore power boxes are supplying power to the same vessel, all circuits are disconnected when any circuit is plugged in or unplugged while energized; and when a single shore power box is supplying power to at least two different vessels, the power supply to the remaining vessels is unaffected if any vessel leaves.

[0032] Among them, reference Figure 1 Each AC / DC integrated shore power box is equipped with at least the following safety control circuit:

[0033] A power module 110 is adapted to be connected to mains power after voltage conversion to provide electrical energy; a first switch 120 is adapted to be connected to the power module 110 to control the connection or disconnection of the power module 110; at least one load branch P and at least one load control branch PC, with each load branch P corresponding to one load control branch PC; the two ends of the load control branch PC are respectively connected to the two ends of the power module 110, and the connection or disconnection of the corresponding load branch P is controlled according to the ship's connection status and a first set status; the two ends of the load branch P are respectively connected to the two ends of the power module 110, and the load branch P further includes at least one connector interface NN for connection to the ship's onboard interface via a cable.

[0034] In some embodiments, the first setting state can be an electricity meter counting state. For example, inserting an electricity meter card can activate the first setting state, and removing the electricity meter card will switch the first setting state to deactivation, thus measuring the electricity used for charging without requiring additional metering circuitry. In other embodiments, the first setting state can also be a safety verification state. For example, after connection is completed and a safety verification is performed manually or automatically, the first setting state is switched to activation; otherwise, it remains deactivation.

[0035] In practical operation, when the ship docks, the cable plugs are inserted into the connector interface and the ship's onboard interface, respectively, thus activating the ship's connectivity. Next, the first preset state is switched to "on," for example, by inserting an electricity meter card into the card slot. When the ship is in both the connectivity state and the first preset state is "on," the load control branch PC controls the corresponding load branch P to conduct, enabling the ship to receive electrical energy from the shore power system for charging.

[0036] In some implementations, an interlocking switch KK is provided between at least two load control branches PC, so that multiple load branches P can be powered together, and when any one of the load branches is hot-plugged, the other interlocked power supply branches can be disconnected at the same time, thereby ensuring power supply safety.

[0037] In some implementations, reference Figure 2 Each load control branch PC includes at least one status feedback switch PN, adapted to be turned on or off based on the ship's connectivity status and a first preset status. Specifically, when in a ship-connected state and the first preset status is on, the status feedback switch PN is off; and when in a ship-disconnected state or the first preset status is off, the status feedback switch PN remains on. Each load branch P corresponding to the load control branch PC includes at least one control switch NC connected in series with the connector interface NN in the load branch P, adapted to remain off when the status feedback switch PN is on, and closed when the status feedback switch PN is off.

[0038] In practical operation, the status feedback switch PN adopts a normally closed design. It is open only when connected to the ship and in the first set state, such as when an electricity meter card is inserted. At this time, the control switch NC then switches to the closed state, making the load branch P conduct.

[0039] In some implementations, reference Figure 3 The status feedback switch PN may include a connection status feedback switch CN and a first setting status switch SN. The connection status feedback switch CN and the first setting status switch SN are connected in parallel, with one end connected to the power module 110 and the other end serving as an output terminal. When connected to a ship, the connection status feedback switch CN is disconnected; when the first setting status is on, the first setting status switch SN is disconnected. The status feedback switch PN is disconnected only when connected to a ship and the first setting status is on.

[0040] In some implementations, reference Figure 4 At least one load control branch PC includes a status feedback switch PN and an inverter TR, and the corresponding load branch P further includes a reed switch GN. The output of the inverter TR is connected to the input of the reed switch GN. The status feedback switch PN is opened only when connected to the ship and the first set state is on, the inverter TR outputs a high level to the reed switch GN, the reed is magnetized, opposite magnetic poles attract each other, the contacts close, and the load branch P is turned on.

[0041] In some implementations, reference Figure 5 At least one load control branch PC includes a status feedback switch PN and a relay coil KA. The relay coil KA is adapted to be connected in series with the status feedback switch PN. For example, one end of the status feedback switch PN is connected to the power module 110, and the other end is connected to the relay coil KA. Furthermore, the auxiliary contact KN of the relay coil KA is connected to the load branch P corresponding to the load control branch PC.

[0042] In practical operation, the status feedback switch PN adopts a normally closed design. In this state, the relay coil KA operates normally, causing the auxiliary contact KN to open. The status feedback switch PN switches to open only when connected to the ship and the first set state is open. At this time, the relay coil KA is de-energized, the auxiliary contact KN closes, and thus the load branch P conducts.

[0043] In some implementations, reference Figure 6 The load branch P may also include an undervoltage release MN, suitable for series connection with the control switch NC. The undervoltage release MN monitors the voltage in real time through a coil or electronic components. When the control switch NC is open, the undervoltage release MN detects that the voltage has dropped to a certain percentage below the rated voltage, such as 40% to 70%, triggering the circuit breaker to trip and disconnect the load branch P. Using undervoltage release disconnects the circuit when the voltage is too low, preventing damage to equipment such as motors, improving circuit reliability and stability, and achieving instantaneous tripping in scenarios of sudden voltage drops with a fast response speed.

[0044] In each embodiment of the aforementioned safety control circuit, the load branch corresponding to the load control branch can only be turned on when the shore power box is connected to the ship and the first preset state is activated, and correspondingly, the ship connected to the load branch can be charged. By setting dual feedback of connection state and first preset state in the load control branch, and controlling the on or off of the corresponding load branch by the load control branch, the shore power box can provide power to the ship under the premise of meeting the standards.

[0045] Specifically, when using a single shore power box to power different vessels, each vessel can be connected to a different load branch, allowing each load branch to independently power each vessel. In this case, when any vessel departs port, disconnecting the shore power box from it will not affect other vessels charging through the same shore power box.

[0046] Furthermore, in some embodiments, the safety control circuit of this disclosure further includes an interlocking switch KK disposed between any two load control branches PC. Through the interlocking switch KK, the load branches P corresponding to at least two load control branches PC connected to the interlocking switch KK can be powered together, and when any one of these branches is hot-plugged, the remaining interlocked power supply branches can be simultaneously disconnected, thereby ensuring power supply safety.

[0047] refer to Figure 7In some embodiments, an interlocking switch KK1 is provided between load control branch PC1 and load control branch PC2. Load control branch PC1 includes: a connection status feedback switch CN1, a first setting status switch SN1, and a relay switch KA1; the connection status feedback switch CN1 and the first setting status switch SN1 are connected in parallel, with one end connected to the power module 110 and the other end connected to one end of the interlocking switch KK1 and the relay switch KA1. Load control branch PC2 includes: a connection status feedback switch CN2, a first setting status switch SN2, and a relay switch KA2; the connection status feedback switch CN2 and the first setting status switch SN2 are connected in parallel, with one end connected to the power module 110 and the other end connected to the other end of the interlocking switch KK1 and the relay switch KA2.

[0048] During operation, interlocking switch KK1 is closed, and load control branches PC1 and PC2 jointly control the power supply to their corresponding load branches P1 and P2 simultaneously. At this time, because interlocking switch KK1 is closed, connection status feedback switches CN1, SN1, CN2, and SN2 are connected in parallel, as are relay switches KA1 and KA2. Connection status feedback switches CN1, SN1, CN2, and SN2 are all open, and relay switches KA1 and KA2 can only enter a de-energized state when and only when load branch P1 is in the connected state and its first setting state is open, and load branch P2 is in the connected state and its first setting state is open. Next, the auxiliary contact KN1 corresponding to relay switch KA1 and the auxiliary contact KN2 corresponding to relay switch KA2 are both connected, thereby enabling load branch P1 and load branch P2 to conduct and achieve common power supply.

[0049] During power supply, when the connection status or first set status of any path changes—for example, the connection of load branch P1 or load branch P2 is interrupted, or the first set status of load branch P1 or load branch P2 is terminated—the corresponding switch in the connection status feedback switch CN1, first set status switch SN1, connection status feedback switch CN2, or first set status switch SN2 will close, thereby restoring relay switches KA1 and KA2 to their normal operating state. At this time, the auxiliary contact KN1 corresponding to relay switch KA1 and the auxiliary contact KN2 corresponding to relay switch KA2 are disconnected, load branches P1 and P2 are disconnected, and the power supply to both load branches is terminated.

[0050] Similarly, when more than two load branches are powered at the same time, closing the interlocking switch between the corresponding load control branches will ensure that if any one of the load branches is hot-plugged, the other interlocked load branches will be disconnected.

[0051] In some implementations, reference Figure 8 An interlocking switch KKi is installed between the load control branch PCx in shore power box x and the load control branch PCy in shore power box y. The load control branch PCx includes: a connection status feedback switch CNx, a first setting status switch SNx, and a relay switch KAx. The connection status feedback switch CNx and the first setting status switch SNx are connected in parallel, with one end connected to the power module x10 and the other end connected to one end of the interlocking switch KKi and the relay switch KAx. The load control branch PCy includes: a connection status feedback switch CNy, a first setting status switch SNy, and a relay switch KAy. The connection status feedback switch CNy and the first setting status switch SNy are connected in parallel, with one end connected to the power module y10 and the other end connected to the other end of the interlocking switch KKy and the relay switch KAy.

[0052] When shore power boxes x and y are needed to jointly supply power to the ship, the interlocking switch KKi is closed. At this time, the connection status feedback switch CNx, the first setting status switch SNx, the connection status feedback switch CNy, and the first setting status switch SNy are connected in parallel, and the relay switches KAx and KAy are connected in parallel. Only when load branch Px is in the connected state and the first setting status of load branch Px is open, and load branch Py is in the connected state and the first setting status of load branch Py is open, the connection status feedback switch CNx, the first setting status switch SNx, the connection status feedback switch CNy, and the first setting status switch SNy are opened. Relay switches KAx and KAy both enter a de-energized state, thereby energizing the auxiliary contact KNx corresponding to relay switch KAx and the auxiliary contact KNy corresponding to relay switch KAy. Then, the corresponding load branches Px and Py are energized, achieving joint power supply.

[0053] Specifically, when any load branch experiences a disconnection or hot-plugging, the corresponding switch closes, restoring relay switches KAx and Kay to their normal operating state. At this time, the auxiliary contacts KNx and KNy corresponding to relay switch KAx and KAy are disconnected, breaking the power supply to load branches Px and Py, thus terminating the power supply to both load branches.

[0054] According to certain embodiments of this disclosure, one or more load branches in multiple shore power boxes can be powered simultaneously. In this case, similarly, closing the interlocking switch between the corresponding load control branches can ensure that if any one of the load branches is disconnected or hot-plugged, all other interlocked load branches will be disconnected.

[0055] According to certain embodiments of this disclosure, the control switch NC may also employ other circuit device combinations, such as, but not limited to, an inverter and a reed switch, or an inverter and an optocoupler. When a reed switch or optocoupler is used, a protective element, such as a freewheeling diode, must be provided in the circuit to prevent overcurrent damage.

[0056] The various embodiments of the aforementioned AC / DC integrated shore power box safety control circuit, by setting dual feedback of connection status and first set status in the load control branch, and by setting one or more sets of load control branches and load branches that are one-to-one corresponding and connected in parallel, ensure that the ship connected to the corresponding load branch can be charged only when the ship is in the connection status and the first set status is activated. Since the conduction of each load branch is controlled by the corresponding load control branch, each load branch can be powered independently. When different load branches in the same shore power box are used to independently power different ships, if any one ship leaves port, the other ships charging through the same shore power box will not be affected, ensuring the independence of power supply.

[0057] Furthermore, the various implementations of the aforementioned AC / DC integrated shore power box safety control circuit, by setting interlocking switches between at least two load control branches in the same or different shore power boxes, enable the load branches corresponding to the connected load control branches to be jointly powered when necessary, thereby meeting the different power supply requirements of the ship and improving the utilization efficiency of the shore power facilities. Moreover, only after all the required parallel plugs are fully connected can the load branch connected to the ship meet the switch closing conditions. When any one of the branches is energized during plugging or unplugging, the remaining one or more interlocked load branches are simultaneously disconnected, improving power supply safety while meeting standards.

[0058] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A safety control circuit for an integrated AC / DC shore power box, characterized in that, include: The power module is suitable for connecting to AC mains power that has undergone voltage conversion, and is used to provide electrical energy; A first switch is adapted to be connected to the power module to control the connection or disconnection of the power module; At least one load branch and at least one load control branch, wherein the load branch and the load control branch correspond one-to-one; The two ends of the load control branch are respectively connected to the two ends of the power module, and the on / off state of the corresponding load branch is controlled according to the ship's connectivity status and the first set state. The two ends of the load branch are respectively connected to the two ends of the power module, and the load branch further includes at least one connector interface for connecting to the ship's onboard interface via a cable.

2. The safety control circuit as described in claim 1, characterized in that, The load control branch includes at least: a status feedback switch, adapted to turn on or off according to the ship's connectivity status and a first set status; the load branch corresponding to the load control branch includes at least: a control switch connected in series with the connector interface, adapted to close when the status feedback switch is off.

3. The safety control circuit as described in claim 2, characterized in that, The status feedback switch is normally closed. It is disconnected only when the device is in communication with the ship and the first set state is open.

4. The safety control circuit as described in claim 3, characterized in that, The status feedback switch includes: a connection status feedback switch and a first set status switch; wherein, the connection status feedback switch and the first set status switch are connected in parallel; when connected to a ship, the connection status feedback switch is disconnected; when the first set status is open, the first set status switch is disconnected.

5. The safety control circuit as described in claim 2 or 3, characterized in that, The load control branch also includes an inverter connected in series with the status feedback switch; the control switch further includes a reed switch; wherein the output terminal of the inverter is connected to the input terminal of the reed switch.

6. The safety control circuit as described in claim 2 or 3, characterized in that, The load control branch also includes a relay coil, which is connected in series with the status feedback switch, and the auxiliary contact of the relay coil is connected to the corresponding load branch, so that the load branch is turned on when the status feedback switch is turned off.

7. The safety control circuit as described in claim 2 or 3, characterized in that, The load branch also includes an undervoltage trip, which is adapted to be connected in series with the control switch.

8. The safety control circuit as described in claim 3, characterized in that, The safety control circuit includes an interlocking switch installed between any two load control branches, such that the load branches corresponding to the connected load control branches can be powered together, and when any one of them is hot-plugged, the other one or more load branches that are interlocked to power supply are simultaneously disconnected.

9. The safety control circuit as described in claim 8, characterized in that, The at least two load control branches are in the same shore power box.

10. The safety control circuit as described in claim 8, characterized in that, The at least two load control branches are located in different shore power boxes.

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