Dual power switching control device and control method thereof

Abstract

The application discloses a dual power switching control device and a control method thereof. The device comprises: a first power supply and a second power supply, which are used for supplying power to an output loop; a contactor, which is used for turning on or off the first power supply or turning on or off the second power supply; a control node, which is connected with the contactor and is used for controlling the on-off of the contactor; a magnetic driving mechanism, which is used for driving the control node to disconnect the connection between the contactor when a short circuit occurs in the output loop; a locking mechanism, which is used for locking the magnetic driving mechanism; a current detection module, which is used for detecting the current flowing through the current detection module; and a control module, which is used for judging whether the short circuit disappears or not, and controlling the locking mechanism to release the locking of the magnetic driving mechanism when the short circuit disappears. The application can more quickly, stably and reliably disconnect the power supply when a short circuit fault occurs, and control the dual power switching device to be put into the power supply again, thereby ensuring the continuity of power supply and being widely applied to the technical field of power supply of a power system.

Description

Technical Field

[0001] This application relates to the field of power supply technology for power systems, and in particular to a dual power supply switching control device and its control method. Background Technology

[0002] The core function of a dual power supply switching device is to automatically switch to a backup power supply when the main power supply fails, so as to ensure uninterrupted power supply to the load.

[0003] However, existing dual-power automatic transfer switches cannot disconnect the circuit during a short circuit. Typically, a circuit breaker needs to be added at the input end, or a thermal relay at the output end, as a protection measure. When a short circuit or overload fault occurs in the output circuit, the circuit breaker trips to disconnect the faulty circuit. However, this existing solution requires a circuit breaker at the input end for protection during contactor short circuits. The circuit breaker, after a short circuit or overload, opens and cannot automatically close, resulting in a loss of power without manual intervention. This is detrimental to the safe operation of continuously powered equipment. Furthermore, in cases of overload or insufficient circuit breaker sensitivity, the circuit breaker cannot effectively disconnect the protection circuit and equipment, potentially causing equipment damage or damage to the dual-power transfer switch. Summary of the Invention

[0004] The main objective of this application is to propose a dual power supply switching control device and its control method, which can disconnect the power supply more quickly, stably and reliably during a short circuit fault, avoiding damage to the equipment or the dual power supply switching device; and control the dual power supply switching device to reconnect the power supply when the short circuit fault disappears, ensuring the continuity of power supply, avoiding the defects of circuit breakers as protection, and restoring power supply without human intervention.

[0005] To achieve the above objectives, one aspect of this application provides a dual-power supply switching control device, comprising: The first and second power supplies are used to power the output circuits. A contactor, connected to a first power supply and a second power supply, is used to turn on or off the first power supply, or to turn on or off the second power supply. A control node, connected to the contactor, is used to control the on / off state of the contactor; A magnetic drive mechanism is connected to the first power supply, the second power supply, and a contactor, and is used to drive the control node to disconnect from the contactor when a short circuit fault occurs in the output circuit. A locking mechanism is provided on one side of the magnetic drive mechanism to lock the magnetic drive mechanism after the control node disconnects from the contactor, so as to keep the connection between the control node and the contactor in the disconnected state. A current detection module, connected to the contactor and the output circuit, is used to detect the current flowing through the current detection module after the control node disconnects from the contactor. The control module is connected to the current detection module and the locking mechanism respectively. It is used to determine whether the short circuit fault has disappeared based on the current detected by the detection module, and to control the locking mechanism to release the lock on the magnetic drive mechanism when the short circuit fault has disappeared.

[0006] In some embodiments, the contactor includes a first contactor and a second contactor; The first contactor includes a first coil and a first normally closed contact, used to connect or disconnect the first power supply. The second contactor includes a second coil and a second normally closed contact, used to connect or disconnect the second power supply. The first normally closed contact is connected to the second coil, and the second normally closed contact is connected to the first coil. In some embodiments, the control node module includes a first control node and a second control node; The first control node is connected to the neutral wire of the first power supply and the second normally closed contact, respectively. The second control node is connected to the neutral line of the second power supply and the first normally closed contact, respectively.

[0007] In some embodiments, the magnetic drive mechanism includes a first magnetic drive mechanism and a second magnetic drive mechanism; The first magnetic drive mechanism includes a first winding, a first permanent magnet, and a first spring. It is used to drive the first control node to disconnect from the first contactor when a short circuit fault occurs in the output circuit and the first power supply is turned on. The first winding is connected to the first power supply and the first contactor, the first permanent magnet is disposed in the first winding, and the first spring is connected to the first permanent magnet. The second magnetic drive mechanism includes a second winding, a second permanent magnet, and a second spring. It is used to drive the second control node to disconnect from the second contactor when a short circuit fault occurs in the output circuit and the second power supply is turned on. The second winding is connected to the second power supply and the second contactor, the second permanent magnet is disposed in the second winding, and the second spring is connected to the second permanent magnet.

[0008] In some embodiments, the locking mechanism includes a first locking mechanism and a second locking mechanism; The first locking mechanism includes a first locking switch and a third spring, used to lock the first magnetic drive mechanism after the first control node disconnects from the first contactor, so as to keep the connection between the first control node and the first contactor in the disconnected state, wherein the first locking switch is connected to the third spring; The second locking mechanism includes a second locking switch and a fourth spring, used to lock the second magnetic drive mechanism after the second control node disconnects from the second contactor, so as to keep the connection between the second control node and the second contactor in the disconnected state, wherein the second locking switch is connected to the fourth spring.

[0009] In some embodiments, the current detection module includes a first current detection module and a second current detection module; The first current detection module includes a first resistor, a first controllable switch, and a first current transformer. It is used to detect the current flowing through the first current detection module after the first control node disconnects from the first contactor. The first controllable switch is connected to the first current transformer and the first resistor, and the first resistor is also connected to the output circuit and the first contactor. The second current detection module includes a second resistor, a second controllable switch, and a second current transformer. It is used to detect the current flowing through the second current detection module after the second control node disconnects from the second contactor. The second controllable switch is connected to the second current transformer and the second resistor, and the second resistor is also connected to the output circuit and the second contactor.

[0010] In some embodiments, the control module includes a control board, a first controller, and a second controller; The control module is used to determine whether the short circuit fault has disappeared based on the current detected by the first current detection module, and if the short circuit fault has disappeared, control the first locking mechanism to release the lock on the first magnetic drive mechanism; or it is used to determine whether the short circuit fault has disappeared based on the current detected by the second current detection module, and if the short circuit fault has disappeared, control the second locking mechanism to release the lock on the second magnetic drive mechanism. The control board is connected to the first controller, the second controller, the first current transformer, and the second current transformer respectively. The first controller is also connected to the second locking mechanism, and the second controller is also connected to the second locking mechanism.

[0011] To achieve the above objectives, another aspect of this application proposes a dual-power supply switching control method, the method comprising: Under normal operating conditions, the first contactor is turned on to supply power to the output circuit through the first power supply. In the event of a short circuit fault in the output circuit, the first magnetic drive mechanism uses the magnetic field generated by the short circuit current to generate movement, driving the first control node to disconnect from the first contactor, so that the first contactor is disconnected from the power supply. The first locking mechanism responds to the movement of the first magnetic drive mechanism by locking the first magnetic drive mechanism, thereby keeping the first control node disconnected from the first contactor. In response to locking the first magnetic drive mechanism, the control module controls the first current detection module to detect the current flowing through the first current detection module; The control module determines whether the short-circuit fault has disappeared based on the current detected by the first current detection module; When the short-circuit fault disappears, the control module controls the first locking mechanism to release the lock on the first magnetic drive mechanism, so that the first magnetic drive mechanism is reset, the first control node is reconnected to the first contactor, and then the first contactor is reconnected to supply power to the output circuit.

[0012] In some embodiments, in response to locking the first magnetic drive mechanism, the control module controls the first current detection module to detect the current flowing through the first current detection module, including: The control module controls the first controllable switch in the first current detection module to close, and connects the first resistor in the first current detection module in series between the first power supply and the output circuit; The current flowing through the first resistor and the output circuit is detected by the first current transformer in the first current detection module.

[0013] In some embodiments, the control module determines whether the short-circuit fault has disappeared based on the current detected by the first current detection module, including: The control module compares the current flowing through the first resistor and the output circuit with a preset short-circuit current threshold and a preset short-circuit recovery current threshold. If the current flowing through the first resistor and the output circuit is greater than or equal to the preset short-circuit current threshold, the control module determines that the short-circuit fault has not disappeared. If the current flowing through the first resistor and the output circuit is less than or equal to the preset short-circuit recovery current threshold, the control module determines that the short-circuit fault has disappeared.

[0014] The embodiments of this application include at least the following beneficial effects: This application provides a dual power supply switching control device and control method thereof. The scheme includes: a first power supply and a second power supply for supplying power to the output circuit; a contactor connected to the first power supply and the second power supply for connecting or disconnecting the first power supply or the second power supply; a control node connected to the contactor for controlling the connection and disconnection of the contactor; a magnetic drive mechanism for driving the control node to disconnect from the contactor when a short circuit fault occurs in the output circuit; a locking mechanism disposed on one side of the magnetic drive mechanism for locking the magnetic drive mechanism after the control node disconnects from the contactor, so as to keep the connection between the control node and the contactor in an open state; a current detection module connected to the contactor and the output circuit for detecting the current flowing through the current detection module after the control node disconnects from the contactor; and a control module connected to the current detection module and the locking mechanism respectively for determining whether the short circuit fault has disappeared based on the current detected by the detection module, and controlling the locking mechanism to release the lock on the magnetic drive mechanism when the short circuit fault disappears. This application designs a purely physical control switch node and interlocking mechanism, which can disconnect the power supply more quickly, stably and reliably during a short circuit fault, avoiding damage to equipment or the dual power supply switching device; and when the short circuit fault disappears, it controls the dual power supply switching device to reconnect the power supply, ensuring the continuity of power supply, avoiding the defects of circuit breakers as protection, and restoring power supply without human intervention. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of a dual power supply switching control device provided in an embodiment of this application; Figure 2 This is a flowchart of a dual power supply switching control method provided in an embodiment of this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0017] It is understood that the terms "first," "second," "third," "fourth," etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0018] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0020] Existing dual-power automatic transfer switches cannot disconnect the circuit during a short circuit. This typically requires adding a circuit breaker at the input or a thermal relay at the output as a protection measure. When a short circuit or overload fault occurs in the output circuit, the circuit breaker trips to disconnect the faulty circuit. However, this existing solution relies on a circuit breaker at the input for protection during contactor short circuits. The circuit breaker, after a short circuit or overload, opens and cannot automatically close, resulting in a loss of power without manual intervention. This is detrimental to the safe operation of continuously powered equipment. Furthermore, under overload conditions or when the circuit breaker's sensitivity is insufficient, it may fail to effectively disconnect the protection circuit and equipment, potentially causing equipment damage or damage to the dual-power transfer switch.

[0021] In view of this, this application provides a dual power supply switching control device and control method thereof. The scheme includes: a first power supply and a second power supply for supplying power to the output circuit; a contactor connected to the first power supply and the second power supply for connecting or disconnecting the first power supply or the second power supply; a control node connected to the contactor for controlling the connection and disconnection of the contactor; a magnetic drive mechanism for driving the control node to disconnect from the contactor when a short circuit fault occurs in the output circuit; a locking mechanism disposed on one side of the magnetic drive mechanism for locking the magnetic drive mechanism after the control node disconnects from the contactor, so as to keep the connection between the control node and the contactor in an open state; a current detection module connected to the contactor and the output circuit for detecting the current flowing through the current detection module after the control node disconnects from the contactor; and a control module connected to the current detection module and the locking mechanism respectively for determining whether the short circuit fault has disappeared based on the current detected by the detection module, and controlling the locking mechanism to release the lock on the magnetic drive mechanism when the short circuit fault disappears. This application designs a purely physical control switch node and interlocking mechanism, which can disconnect the power supply more quickly, stably and reliably during a short circuit fault, avoiding damage to equipment or the dual power supply switching device; and when the short circuit fault disappears, it controls the dual power supply switching device to reconnect the power supply, ensuring the continuity of power supply, avoiding the defects of circuit breakers as protection, and restoring power supply without human intervention.

[0022] like Figure 1 The diagram shown is an overall structural diagram of a dual-power switching control device provided in an embodiment of this application. (Refer to...) Figure 1 This application discloses a dual-power switching control device, comprising: The first power supply U1 and the second power supply U2 are used to power the output circuit U3; The contactor is connected to the first power supply U1 and the second power supply U2, and is used to turn on or off the first power supply U1, or to turn on or off the second power supply U2. A control node, connected to the contactor, is used to control the on / off state of the contactor; A magnetic drive mechanism is connected to the first power supply, the second power supply, and a contactor, and is used to drive the control node to disconnect from the contactor when a short circuit fault occurs in the output circuit. A locking mechanism is provided on one side of the magnetic drive mechanism to lock the magnetic drive mechanism after the control node disconnects from the contactor, so as to keep the connection between the control node and the contactor in the disconnected state. A current detection module, connected to the contactor and the output circuit, is used to detect the current flowing through the current detection module after the control node disconnects from the contactor. The control module is connected to the current detection module and the locking mechanism respectively. It is used to determine whether the short circuit fault has disappeared based on the current detected by the detection module, and to control the locking mechanism to release the lock on the magnetic drive mechanism when the short circuit fault has disappeared.

[0023] For example, such as Figure 1 As shown, in some embodiments, the contactor includes a first contactor KM1 and a second contactor KM2; KM1 and KM2 respectively correspond to the on / off control of the first power supply U1 and the second power supply U2, realizing the switching and power supply control of the dual power supply.

[0024] The first contactor KM1 includes a first coil and a first normally closed contact, used to connect or disconnect the first power supply. The second contactor KM2 includes a second coil and a second normally closed contact, used to connect or disconnect the second power supply. The first normally closed contact is connected to the second coil, and the second normally closed contact is connected to the first coil.

[0025] Specifically, the input terminal 135 of the first contactor KM1 is connected to the first power supply U1, and the output terminal 246 of the first contactor KM1 is connected to the output circuit U3; the input terminal 135 of the second contactor KM2 is connected to the second power supply U2, and the output terminal 246 of the second contactor KM2 is connected to the output circuit U3. The inlet 11C of the first normally closed contact is connected to the second control node K22, the outlet 12C of the first normally closed contact is connected to the second coil inlet A1 of the second contactor KM2, and the outlet A2 of the second coil is connected to the second power supply U2; the inlet 11C of the second normally closed contact is connected to the first control node K12, the outlet 12C of the second normally closed contact is connected to the first coil inlet A1 of the first contactor KM1, and the outlet A2 of the first coil is connected to the first power supply U1.

[0026] For example, in some embodiments, the control node includes a first control node K12 and a second control node K22; The first control node K12 is connected to the neutral line N1 of the first power supply U1 and the second normally closed contact, respectively. The second control node K22 is connected to the neutral line N2 of the second power supply U2 and the first normally closed contact, respectively.

[0027] Specifically, both the first control node K12 and the second control node K22 are normally closed nodes. One end of the first control node K12 is connected to the neutral line N1 of the first power supply U1, and the other end is connected to the inlet 11C of the second normally closed contact of the second contactor KM2. One end of the second control node K22 is connected to the neutral line N2 of the second power supply U2, and the other end is connected to the inlet 11C of the normally closed contact of the first contactor KM1.

[0028] In this embodiment, the neutral wire N1 of the first power supply U1, the first control node, the second normally closed contact of the second contactor, the first coil of the first contactor, and the first power supply U1 are connected in series to form the first coil control circuit (i.e., the KM1 coil control circuit) in the first contactor; similarly, the neutral wire N2 of the second power supply U2, the second control node, the first normally closed contact of the first contactor, the second coil of the second contactor, and the second power supply U2 are connected in series to form the second coil control circuit (i.e., the KM2 coil control circuit) in the second contactor.

[0029] For example, in some embodiments, the magnetic drive mechanism includes a first magnetic drive mechanism and a second magnetic drive mechanism; The first magnetic drive mechanism includes a first winding RZ1, a first permanent magnet CT1, and a first spring T12. It is used to drive the first control node K12 to disconnect from the first contactor KM1 when a short circuit fault occurs in the output circuit U3 and the first power supply U1 is turned on. The first winding RZ1 is connected to the first power supply U1 and the first contactor KM1, the first permanent magnet CT1 is disposed in the first winding RZ1, and the first spring T12 is connected to the first permanent magnet CT1. The second magnetic drive mechanism includes a second winding RZ2, a second permanent magnet CT2, and a second spring T22. It is used to drive the second control node K22 to disconnect from the second contactor KM2 when a short circuit fault occurs in the output circuit U3 and the second power supply is turned on U2. The second winding RZ2 is connected to the second power supply U2 and the second contactor KM2, respectively. The second permanent magnet CT2 is disposed in the second winding RZ2, and the second spring T22 is connected to the second permanent magnet CT2.

[0030] Specifically, the first winding RZ1 is connected in series between the first power supply U1 and the input terminal 135 of the first contactor KM1, meaning that the first power supply U1 is connected to the input terminal 135 of the first contactor KM1 after passing through the first winding RZ1. The first permanent magnet CT1 is disposed within the first winding RZ1, and the first spring T12 is connected to the first permanent magnet CT1. When the first power supply U1 normally supplies power to the output circuit U3, the first permanent magnet CT1 is in its initial position under the action of the first spring T12, the first control node K12 remains normally closed, the coil control circuit of the first contactor KM1 is open, and the first contactor KM1 remains engaged. When a short-circuit fault occurs in the output circuit U3, the short-circuit current flows through the first winding RZ1, causing the first winding RZ1 to generate a magnetic field, driving the first permanent magnet CT1 to move downwards, thereby causing the first control node K12 to open, cutting off the coil control circuit of the first contactor KM1, causing the first contactor KM1 to open, and thus disconnecting the connection between the first power supply U1 and the output circuit U3.

[0031] Similarly, the second winding RZ2 is connected in series between the second power supply U2 and the input terminal 135 of the second contactor KM2, meaning that the second power supply U2 is connected to the input terminal 135 of the second contactor KM2 after passing through the second winding RZ2. The second permanent magnet CT2 is disposed inside the second winding RZ2, and the second spring T22 is connected to the second permanent magnet CT2. When the second power supply U2 is turned on and a short circuit fault occurs in the output circuit U3, the short circuit current flows through the second winding RZ2, driving the second permanent magnet CT2 to move downward, causing the second control node K22 to open, cutting off the coil control circuit of the second contactor KM2, thus disconnecting the second contactor KM2 and disconnecting the connection between the second power supply U2 and the output circuit U3.

[0032] For example, in some embodiments, the locking mechanism includes a first locking mechanism and a second locking mechanism; The first locking mechanism includes a first locking switch KK1 and a third spring T11, which is used to lock the first magnetic drive mechanism after the first control node K12 disconnects from the first contactor KM1, so as to keep the connection between the first control node K12 and the first contactor KM1 in the disconnected state, wherein the first locking switch KK1 is connected to the third spring T11. The second locking mechanism includes a second locking switch KK2 and a fourth spring T21, which are used to lock the second magnetic drive mechanism after the second control node K22 disconnects from the second contactor KM2, so as to keep the connection between the second control node K22 and the second contactor KM2 in the disconnected state, wherein the second locking switch KK2 is connected to the fourth spring T21.

[0033] Specifically, when a short-circuit fault occurs in the output circuit U3, the first permanent magnet CT1 moves downward under the magnetic field generated by the short-circuit current, causing the first control node K12 to disconnect from the first contactor. During its downward movement, the first permanent magnet CT1 actuates the first locking switch KK1, which moves to the right under the action of the third spring T11, locking the first permanent magnet CT1 and preventing the first control node K12 from reclosing. Thus, the first locking mechanism locks the first magnetic drive mechanism in the open position, maintaining the connection between the first control node K12 and the first contactor KM1 in an open state.

[0034] Similarly, when the second power supply U2 is on and a short circuit fault occurs in the output circuit U3, the second permanent magnet CT2 moves downward under the magnetic field generated by the short circuit current, causing the second control node K22 to disconnect from the second contactor KM2. During the downward movement of the second permanent magnet CT2, the second locking switch KK2 is activated. Under the action of the fourth spring T21, the second locking switch KK2 moves to the right, locking the second permanent magnet CT2 and preventing the second control node K22 from reclosing. Thus, the second locking mechanism locks the second magnetic drive mechanism in the open position, keeping the connection between the second control node K22 and the second contactor KM2 in the open state.

[0035] For example, in some embodiments, the current detection module includes a first current detection module and a second current detection module; The first current detection module includes a first resistor R1, a first controllable switch K11, and a first current transformer TI1. It is used to detect the current flowing through the first current detection module after the first control node K12 disconnects from the first contactor KM1. The first controllable switch K11 is connected to the first current transformer TI1 and the first resistor R1. The first resistor R1 is also connected to the output circuit U3 and the first contactor KM1. The second current detection module includes a second resistor R2, a second controllable switch K21, and a second current transformer TI2. It is used to detect the current flowing through the second current detection module after the second control node K22 disconnects from the second contactor KM2. The second controllable switch K21 is connected to the second current transformer TI2 and the second resistor R2, respectively. The second resistor R2 is also connected to the output circuit U3 and the second contactor KM2.

[0036] Specifically, one end of the first resistor R1 is connected between the output terminal 246 of the first contactor KM1 and the output circuit U3, and the other end of the first resistor R1 is connected to one end of the first current transformer TI1 through the first controllable switch K11; the other end of the first current transformer TI1 is also connected to the control module.

[0037] One end of the second resistor R2 is connected between the output terminal 246 of the second contactor KM2 and the output circuit U3. The other end of the second resistor R1 is connected to one end of the second current transformer TI2 via the second controllable switch K21. The other end of the second current transformer TI2 is also connected to the control module.

[0038] For example, in some embodiments, the control module includes a control board, a first controller J1, and a second controller J2; The control module is used to determine whether the short circuit fault has disappeared based on the current detected by the first current detection module, and if the short circuit fault has disappeared, control the first locking mechanism to release the lock on the first magnetic drive mechanism; or it is used to determine whether the short circuit fault has disappeared based on the current detected by the second current detection module, and if the short circuit fault has disappeared, control the second locking mechanism to release the lock on the second magnetic drive mechanism. The control board is connected to the first controller J1, the second controller J2, the first current transformer TI1, and the second current transformer TI2 respectively. The first controller J1 is also connected to the first locking mechanism, and the second controller J2 is also connected to the second locking mechanism.

[0039] Specifically, the control board is connected to the first current transformer TI1 and the second current transformer TI2, respectively acquiring the current value detected by the first current transformer TI1 flowing between the first resistor R1 and the output circuit U3, and the current value detected by the second current transformer TI2 flowing between the second resistor R2 and the output circuit U3.

[0040] Taking the first power supply U1 as an example, when a short circuit fault occurs in the output circuit U3, after the first control node K12 disconnects from the first contactor KM1, the control board controls the first controllable switch K11 to close, connecting the first resistor R1 between the input terminal of the first power supply U1 and the output circuit U3. The first current transformer TI1 detects the current flowing between the first resistor R1 and the output circuit U3 and transmits the detected current value to the control board. The control board determines whether the short circuit fault has disappeared based on the detected current: when the detected current value is greater than or equal to the preset short circuit current threshold I1, it is determined that the short circuit fault still exists; when the detected current value is less than or equal to the preset recovery current threshold I2, it is determined that the short circuit fault has disappeared.

[0041] When the control board detects that the short circuit fault has disappeared, it controls the first interlocking switch KK1 to move to the left via the first controller J1, releasing the lock on the first permanent magnet CT1. The first permanent magnet CT1 moves upward to reset under the action of the first spring T12, causing the first control node K12 to close again. The coil of the first contactor KM1 is re-energized, and the first contactor KM1 reconnects the first power supply U1 to supply power to the output circuit U3.

[0042] Similarly, for the second power supply U2, when a short circuit fault occurs in the output circuit U3, after the second control node K22 disconnects from the second contactor, the control board controls the second controllable switch K21 to close, connecting the second resistor R2 between the input terminal of the second power supply U2 and the output circuit U3. The current flowing through the second resistor R2 and the output circuit U3 is detected by the second current transformer TI2, and the detected current value is transmitted to the control board. Based on the detected current value, the control board determines whether the short circuit fault has disappeared. When the short circuit fault is detected to have disappeared, the control board controls the second interlocking switch KK2 to move to the left through the second controller J2, releasing the lock on the second permanent magnet CT2. The second permanent magnet CT2 moves upward to reset under the action of the second spring T22, causing the second control node K22 to close again. The coil of the second contactor KM2 is re-energized, and the second contactor KM2 reconnects the second power supply U2 to supply power to the output circuit U3.

[0043] This application also provides a dual power supply switching control method, applied to the aforementioned dual power supply switching control device. Figure 2 This is a flowchart of a dual-power switching control method provided in an embodiment of this application, such as... Figure 2 As shown, the method includes the following steps: S100. Under normal operating conditions, control the first contactor to turn on so as to supply power to the output circuit through the first power supply.

[0044] Specifically, during normal operation, the first control node K12 is in a normally closed state. The neutral wire N1 of the first power supply U1 is connected to the first coil inlet A1 of the first contactor KM1 through the first control node K12 and the second normally closed contact of the second contactor KM2. The outlet A2 of the first coil is connected to the first power supply U1, forming the first coil control circuit. The coil of the first contactor KM1 is energized and engaged. After the first contactor KM1 is engaged, the first power supply U1 is connected to the output circuit U3 for power supply. At the same time, the first normally closed contact of the first contactor KM1 is opened, cutting off the second coil control circuit of the second contactor KM2, so that the second contactor KM2 is in an open state, realizing electrical interlocking and preventing both power supplies from simultaneously supplying power to the output circuit U3.

[0045] S200. In the event of a short circuit fault in the output circuit, the first magnetic drive mechanism uses the magnetic field generated by the short circuit current to generate movement, driving the first control node to disconnect from the first contactor, so that the first contactor disconnects from the power supply.

[0046] Specifically, when a short-circuit fault occurs in the output circuit U3, a large current flows through the first winding RZ1, causing the first winding RZ1 to generate strong magnetism, driving the first permanent magnet CT1 to move downwards, thereby causing the first control node K12 to disconnect. After the first control node K12 disconnects, the coil circuit of the first contactor KM1 is cut off, the coil of the first contactor KM1 is de-energized, causing the first contactor KM1 to disconnect, thereby cutting off the connection between the first power supply U1 and the output circuit U3, and stopping the supply of power to the output circuit U3.

[0047] S300, the first locking mechanism responds to the movement of the first magnetic drive mechanism by locking the first magnetic drive mechanism, thereby keeping the first control node disconnected from the first contactor.

[0048] S400, in response to locking the first magnetic drive mechanism, the control module controls the first current detection module to detect the current flowing through the first current detection module.

[0049] For example, the step of the control module controlling the first current detection module to detect the current flowing through the first current detection module in response to locking the first magnetic drive mechanism includes S410-S420: S410, The control module controls the first controllable switch in the first current detection module to close, and connects the first resistor in the first current detection module in series between the first power supply and the output circuit; Specifically, when the first control node K12 is disconnected and the first contactor KM1 is disconnected, the control board in the control module controls the first controllable switch K11 to close, and connects the first resistor R1 between the input terminal of the first power supply U1 and the output circuit U3.

[0050] S420. The current flowing through the first resistor and the output circuit is detected by the first current transformer in the first current detection module.

[0051] Specifically, the first current transformer TI1 detects the current flowing between the first resistor R1 and the output circuit U3, and transmits the detected current value to the control board.

[0052] S500: The control module determines whether the short-circuit fault has disappeared based on the current detected by the first current detection module.

[0053] For example, the step of the control module determining whether the short-circuit fault has disappeared based on the current detected by the first current detection module includes S510-S530: S510, The control module compares the current flowing through the first resistor and the output circuit with a preset short-circuit current threshold and a preset short-circuit recovery current threshold. Specifically, the control board acquires the current detected by the first current transformer TI1 and compares this current with preset short-circuit current threshold I1 and preset recovery current threshold I2. The preset short-circuit current threshold I1 is determined according to the formula I1=U1 / (R1+r), where U1 is the voltage value of the first power supply U1, R1 is the resistance value of the first resistor R1, and r is the internal resistance of the entire circuit during a short circuit. The preset recovery current threshold I2 is determined according to the formula: I2=U1 / (R1+Rf), where Rf is the load resistance.

[0054] S520. If the current flowing through the first resistor and the output circuit is greater than or equal to the preset short-circuit current threshold, the control module determines that the short-circuit fault has not disappeared. S530. If the current flowing through the first resistor and the output circuit is less than or equal to the preset short-circuit recovery current threshold, the control module determines that the short-circuit fault has disappeared.

[0055] S600, when the short circuit fault disappears, the control module controls the first locking mechanism to release the lock on the first magnetic drive mechanism, so that the first magnetic drive mechanism is reset, the first control node is reconnected to the first contactor, and then the first contactor is reconnected to the first power supply to supply power to the output circuit.

[0056] Specifically, when the control board detects that the short circuit fault has disappeared, it controls the first interlocking switch KK1 to move to the left via controller J1, causing the first permanent magnet to move upward under the force of spring T2, thereby closing control node K12. Control node K12 is connected in series with the coil of the dual power supply switching device, and the dual power supply switching device can be closed after being energized.

[0057] Specifically, after the control board determines that the short circuit fault has disappeared, the control board controls the first interlocking switch KK1 to move to the left via the first controller J1, releasing the lock on the first permanent magnet CT1. The first permanent magnet CT1 moves upward to reset under the action of the first spring T12, causing the first control node K12 to close again. After the first control node K12 closes, the coil of the first contactor KM1 is re-energized, the first contactor KM1 closes, and the first power supply U1 is re-connected to supply power to the output circuit U3.

[0058] To explain in detail the principles of the technical solution of this application, the overall process of this application will be described below with reference to some specific embodiments. It is easy to understand that the following is an explanation of the technical principles of this application and should not be regarded as a limitation of this application.

[0059] In a specific embodiment, the overall structural diagram of the dual power supply switching control device of this application is shown below. Figure 1 As shown, specifically, the first control node K12 is connected in series in the coil control circuit of the first contactor KM1, as follows: Figure 1 The KM1 coil control circuit, highlighted by the dashed line, connects the neutral wire N1 of the first power supply U1 to the input terminal 11C of the second normally closed contact of the second contactor KM2 after passing through the first control node K12. It then connects from the output terminal 12C of the second normally closed contact to the KM1 coil inlet A1, and the KM1 coil outlet A2 is connected to the first power supply U1. Similarly, the second control node K22 is connected in series with the KM2 coil control circuit of the second contactor KM2. Figure 1 The control circuit of the KM2 coil, highlighted by the dashed line, connects the neutral wire N2 of the second power supply U2 to the input terminal 11C of the first normally closed contact of the first contactor KM1 after passing through the second control node K22. From there, it connects to the KM2 coil inlet A1 from the output terminal 12C of the first normally closed contact. The KM2 coil outlet A2 connects to the second power supply U2. The first power supply U1 passes through the first winding RZ1 and is connected to the input terminal 135 of the first contactor KM1; similarly, the second power supply U2 passes through the second winding RZ2 and is connected to the input terminal 135 of the second contactor KM2. The output terminal of the first resistor R1 is connected to the output terminal 246 of the first contactor KM1; similarly, the output terminal of the second resistor R2 is connected to the output terminal 246 of the second contactor KM2. The output terminals 246 of both the first and second contactors KM1 are connected to the output circuit U3.

[0060] The control steps for the dual power supply switching control device during operation are as follows: Step 1: During normal operation, the first control node K12 is closed. The first coil of the first contactor KM1 forms a circuit with the second normally closed contacts 11C-12C of the second contactor KM2, the first control node K12, and the neutral line N1. At this time, the first contactor KM1 is closed, and simultaneously, the normally closed contacts 11C-12C of the first contactor KM1 are open, causing the second contactor KM2 to open. When a short circuit fault occurs in the output circuit U3, a large current flows through the first winding RZ1, causing the first winding RZ1 to generate strong magnetism, attracting the first permanent magnet CT1 downwards, thereby causing the first control node K12 to open. At the same time, it is locked by the first interlocking switch KK1. Therefore, the coil of the first contactor KM1 is de-energized, causing the first contactor KM1 to open.

[0061] Step 2: The control board controls the first controllable switch K11 to close, and the first resistor R1 is connected between the input circuit U1 and the output circuit U3. Then, the current is measured by the first current transformer TI. When the current is greater than or equal to the short circuit current I1, it is determined that a short circuit fault exists; when the current is less than or equal to the recovery current I2, it is determined that the short circuit fault has been recovered.

[0062] The value of the short-circuit current I1 is calculated using the following formula: I1 = U1 / (R1 + r); Where U1 is the voltage value of the first input power supply, and r is the internal resistance of the entire circuit when short-circuited; The value of the recovery current I2 is calculated using the following formula: I2 = U1 / (R1 + Rf); Where Rf is the load resistance.

[0063] Third, when the short circuit fault is detected to be restored, the control board controls the first interlocking switch KK1 to move to the left through the first controller J1. The first permanent magnet CT1 moves upward under the force of the spring T12, so that the first control node K12 is closed, thereby re-energizing the coil of the first contactor KM1 and closing the first contactor KM1.

[0064] The entire process utilizes the physical attraction of the coil to disconnect the short-circuit fault circuit quickly and reliably. Simultaneously, monitoring short-circuit recovery allows for the reactivation of the dual-power switching device, ensuring continuous and reliable power supply.

[0065] In summary, this application provides a dual-power switching control device and its control method. The solution includes: a first power supply and a second power supply for supplying power to the output circuit; a contactor connected to the first and second power supplies for switching the first power supply on or off, or for switching the second power supply on or off; a control node connected to the contactor for controlling the on / off state of the contactor; a magnetic drive mechanism for driving the control node to disconnect from the contactor when a short-circuit fault occurs in the output circuit; a locking mechanism located on one side of the magnetic drive mechanism for locking the magnetic drive mechanism after the control node disconnects from the contactor, thus maintaining the disconnection between the control node and the contactor; a current detection module connected to the contactor and the output circuit for detecting the current flowing through the current detection module after the control node disconnects from the contactor; and a control module connected to both the current detection module and the locking mechanism for determining whether the short-circuit fault has disappeared based on the current detected by the detection module, and controlling the locking mechanism to release the lock on the magnetic drive mechanism when the short-circuit fault has disappeared. This application designs a purely physical control switch node and interlocking mechanism, which can disconnect the power supply more quickly, stably and reliably during a short circuit fault, avoiding damage to equipment or the dual power supply switching device; and when the short circuit fault disappears, it controls the dual power supply switching device to reconnect the power supply, ensuring the continuity of power supply, avoiding the defects of circuit breakers as protection, and restoring power supply without human intervention.

[0066] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0067] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0068] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0070] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0071] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A dual-power switching control device, characterized in that, include: The first and second power supplies are used to power the output circuits. A contactor, connected to a first power supply and a second power supply, is used to turn on or off the first power supply, or to turn on or off the second power supply. A control node, connected to the contactor, is used to control the on / off state of the contactor; A magnetic drive mechanism is connected to the first power supply, the second power supply, and a contactor, and is used to drive the control node to disconnect from the contactor when a short circuit fault occurs in the output circuit. A locking mechanism is provided on one side of the magnetic drive mechanism to lock the magnetic drive mechanism after the control node disconnects from the contactor, so as to keep the connection between the control node and the contactor in the disconnected state. A current detection module, connected to the contactor and the output circuit, is used to detect the current flowing through the current detection module after the control node disconnects from the contactor. The control module is connected to the current detection module and the locking mechanism respectively. It is used to determine whether the short circuit fault has disappeared based on the current detected by the detection module, and to control the locking mechanism to release the lock on the magnetic drive mechanism when the short circuit fault has disappeared.

2. The dual power supply switching control device according to claim 1, characterized in that, The contactor includes a first contactor and a second contactor; The first contactor includes a first coil and a first normally closed contact, used to connect or disconnect the first power supply. The second contactor includes a second coil and a second normally closed contact, used to connect or disconnect the second power supply. The first normally closed contact is connected to the second coil, and the second normally closed contact is connected to the first coil.

3. The dual power supply switching control device according to claim 2, characterized in that, The control node module includes a first control node and a second control node; The first control node is connected to the neutral wire of the first power supply and the second normally closed contact, respectively. The second control node is connected to the neutral line of the second power supply and the first normally closed contact, respectively.

4. The dual power supply switching control device according to claim 3, characterized in that, The magnetic drive mechanism includes a first magnetic drive mechanism and a second magnetic drive mechanism; The first magnetic drive mechanism includes a first winding, a first permanent magnet, and a first spring. It is used to drive the first control node to disconnect from the first contactor when a short circuit fault occurs in the output circuit and the first power supply is turned on. The first winding is connected to the first power supply and the first contactor, the first permanent magnet is disposed in the first winding, and the first spring is connected to the first permanent magnet. The second magnetic drive mechanism includes a second winding, a second permanent magnet, and a second spring. It is used to drive the second control node to disconnect from the second contactor when a short circuit fault occurs in the output circuit and the second power supply is turned on. The second winding is connected to the second power supply and the second contactor, the second permanent magnet is disposed in the second winding, and the second spring is connected to the second permanent magnet.

5. The dual power supply switching control device according to claim 4, characterized in that, The locking mechanism includes a first locking mechanism and a second locking mechanism; The first locking mechanism includes a first locking switch and a third spring, used to lock the first magnetic drive mechanism after the first control node disconnects from the first contactor, so as to keep the connection between the first control node and the first contactor in the disconnected state, wherein the first locking switch is connected to the third spring; The second locking mechanism includes a second locking switch and a fourth spring, used to lock the second magnetic drive mechanism after the second control node disconnects from the second contactor, so as to keep the connection between the second control node and the second contactor in the disconnected state, wherein the second locking switch is connected to the fourth spring.

6. The dual power supply switching control device according to claim 5, characterized in that, The current detection module includes a first current detection module and a second current detection module; The first current detection module includes a first resistor, a first controllable switch, and a first current transformer. It is used to detect the current flowing through the first current detection module after the first control node disconnects from the first contactor. The first controllable switch is connected to the first current transformer and the first resistor, and the first resistor is also connected to the output circuit and the first contactor. The second current detection module includes a second resistor, a second controllable switch, and a second current transformer. It is used to detect the current flowing through the second current detection module after the second control node disconnects from the second contactor. The second controllable switch is connected to the second current transformer and the second resistor, and the second resistor is also connected to the output circuit and the second contactor.

7. The dual power supply switching control device according to claim 6, characterized in that, The control module includes a control board, a first controller, and a second controller; The control module is used to determine whether the short circuit fault has disappeared based on the current detected by the first current detection module, and if the short circuit fault has disappeared, control the first locking mechanism to release the lock on the first magnetic drive mechanism; or it is used to determine whether the short circuit fault has disappeared based on the current detected by the second current detection module, and if the short circuit fault has disappeared, control the second locking mechanism to release the lock on the second magnetic drive mechanism. The control board is connected to the first controller, the second controller, the first current transformer, and the second current transformer respectively. The first controller is also connected to the second locking mechanism, and the second controller is also connected to the second locking mechanism.

8. A dual-power supply switching control method, applied to the dual-power supply switching control device according to any one of claims 1 to 7, characterized in that, The method includes: Under normal operating conditions, the first contactor is turned on to supply power to the output circuit through the first power supply. In the event of a short circuit fault in the output circuit, the first magnetic drive mechanism uses the magnetic field generated by the short circuit current to generate movement, driving the first control node to disconnect from the first contactor, so that the first contactor is disconnected from the power supply. The first locking mechanism responds to the movement of the first magnetic drive mechanism by locking the first magnetic drive mechanism, thereby keeping the first control node disconnected from the first contactor. In response to locking the first magnetic drive mechanism, the control module controls the first current detection module to detect the current flowing through the first current detection module; The control module determines whether the short-circuit fault has disappeared based on the current detected by the first current detection module; When the short-circuit fault disappears, the control module controls the first locking mechanism to release the lock on the first magnetic drive mechanism, so that the first magnetic drive mechanism is reset, the first control node is reconnected to the first contactor, and then the first contactor is reconnected to supply power to the output circuit.

9. The dual power supply switching control method according to claim 8, characterized in that, In response to locking the first magnetic drive mechanism, the control module controls the first current detection module to detect the current flowing through the first current detection module, including: The control module controls the first controllable switch in the first current detection module to close, and connects the first resistor in the first current detection module in series between the first power supply and the output circuit; The current flowing through the first resistor and the output circuit is detected by the first current transformer in the first current detection module.

10. The dual-power supply switching control method according to claim 9, characterized in that, The control module determines whether the short-circuit fault has disappeared based on the current detected by the first current detection module, including: The control module compares the current flowing through the first resistor and the output circuit with a preset short-circuit current threshold and a preset short-circuit recovery current threshold. If the current flowing through the first resistor and the output circuit is greater than or equal to the preset short-circuit current threshold, the control module determines that the short-circuit fault has not disappeared. If the current flowing through the first resistor and the output circuit is less than or equal to the preset short-circuit recovery current threshold, the control module determines that the short-circuit fault has disappeared.

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