Release, switching device and power converter

Abstract

The utility model discloses a release, a switching device and a power converter, and relates to the technical field of power electronics. The release is provided with two push rods which are respectively controlled by corresponding signals through a signal receiving assembly. Besides, a baffle is fixedly connected with the first push rod, so that the baffle is limited by the second push rod under the condition that the first push rod is in a suction state and the second push rod is in a release state, and the first push rod cannot be switched into the release state; under the condition that the second push rod is in the pull-in state, limiting on the baffle is relieved, and the first push rod can be freely pulled in and released; furthermore, the states of the two push rods have various combinations, so that the pull-in state of the release can correspond to at least two state combinations of the two push rods, and the release state of the release can also correspond to at least two state combinations of the two push rods. Therefore, the release can realize various states.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, and in particular to a tripping device, a switching device and a power converter. BACKGROUND

[0002] The tripping device is used to control the switching body to quickly open. When the tripping device is in an attracted state, the switching body can be freely opened and closed; and when the tripping device is in a released state, the switching body can only be in an open state. At present, the switching body in the switching device is usually configured to use an under-voltage tripping device or a split-field tripping device, and no matter which tripping device is used, the state that can be achieved only includes one attracted state and one released state. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a tripping device, a switching device and a power converter, so that the tripping device can achieve multiple states. The specific scheme is as follows:

[0004] The first aspect of the present application provides a tripping device, comprising: a signal receiving assembly and an action assembly; wherein,

[0005] The two-way input ends of the signal receiving assembly receive a first signal and a second signal respectively;

[0006] The action assembly comprises a first push rod, a second push rod and a baffle; the state of the first push rod is controlled by the signal receiving assembly according to the first signal, the state of the second push rod is controlled by the signal receiving assembly according to the second signal, and the baffle is fixedly connected with the first push rod; when the first push rod is in an attracted state and the second push rod is in a released state, the baffle is limited by the second push rod, so that the first push rod cannot be switched to a released state; when the second push rod is in an attracted state, the limitation on the baffle is released.

[0007] The state of the tripping device is controlled by the first push rod; when the first push rod is in an attracted state or cannot be switched to a released state, the tripping device is in an attracted state; when the first push rod is in a released state, the tripping device is in a released state.

[0008] In a possible implementation, when the first push rod and the second push rod are both in an attracted state, the tripping device is in a first attracted state;

[0009] When the first push rod is in an attracted state and the second push rod is in a released state, the tripping device is in a second attracted state;

[0010] The first push rod cannot be switched from the attracted state to the released state due to the baffle being limited, and the second push rod is in the released state, the tripper is in the third attracted state;

[0011] The first push rod is in the released state, and the second push rod is in the attracted state, the tripper is in the first released state;

[0012] The first push rod is switched to the released state first, and the second push rod is switched to the released state later, and the tripper is in the second released state.

[0013] In a possible implementation, the signal receiving assembly includes: a first coil and a second coil;

[0014] Both ends of the first coil serve as one-way input terminals of the signal receiving assembly and receive the first signal;

[0015] Both ends of the second coil serve as the other-way input terminals of the signal receiving assembly and receive the second signal.

[0016] In a possible implementation, the signal receiving assembly further includes: an energy storage device;

[0017] The energy storage device is connected between both ends of the second coil.

[0018] In a possible implementation, the first signal and the second signal are both high-level signals, corresponding to the first push rod and the second push rod being in the attracted state;

[0019] The first signal is a high-level signal, and the second signal is a low-level signal, corresponding to the first push rod being in the attracted state and the second push rod being in the released state;

[0020] In the case that the second signal is a low-level signal, the first signal is switched from a high-level signal to a low-level signal, corresponding to the first push rod being unable to be switched from the attracted state to the released state due to the baffle being limited, and the second push rod being in the released state;

[0021] The first signal is a low-level signal, and the second signal is a high-level signal, corresponding to the first push rod being in the released state and the second push rod being in the attracted state;

[0022] The first signal and the second signal are both switched from high-level signals to low-level signals, corresponding to the first push rod being switched to the released state first and the second push rod being switched to the released state later.

[0023] In a possible implementation, the switch device further includes: a reset mechanism;

[0024] The inner side of the reset mechanism is mechanically connected with the first push rod and the second push rod respectively;

[0025] The outer side of the reset mechanism is used for receiving a reset operation for switching the tripper from the released state to the attracted state.

[0026] The second aspect of the present application provides a switch device, comprising: a switch body and a tripper as described in the first aspect and any implementation form of the first aspect;

[0027] The operating mechanism in the switch body is controlled by the tripper.

[0028] In a possible implementation, the switch body comprises: P moving contacts and P static contacts; P is a positive integer;

[0029] Each of the moving contacts is controlled by the operating mechanism;

[0030] Each of the moving contacts is movably connected with the corresponding static contact.

[0031] The third aspect of the present application provides a power converter, comprising: a main circuit and a controller; wherein,

[0032] Both sides of the main circuit are used as both sides of the power converter respectively;

[0033] The switch device as described in the second aspect and any implementation form of the second aspect is arranged in at least one side transmission branch of the power converter;

[0034] The main circuit is controlled by the controller;

[0035] The controller further outputs a first signal and a second signal to the tripper in the switch device.

[0036] In a possible implementation, the switch device on either side of the power converter is arranged inside or outside the power converter.

[0037] By the technical scheme, the tripping device provided by the application has two push rods, the state of the first push rod is controlled by the signal receiving assembly through a first signal, and the state of the second push rod is controlled by the signal receiving assembly through a second signal; in addition, a baffle is fixedly connected with the first push rod, so that when the first push rod is in the attraction state and the second push rod is in the release state, the baffle is limited by the second push rod, and the first push rod cannot be switched to the release state; and when the second push rod is in the attraction state, the baffle is released from the limitation, and the first push rod can be freely attracted and released; furthermore, the states of the two push rods have multiple combinations, although the state of the tripping device is controlled by the first push rod, the tripping device is in the attraction state when the first push rod is in the attraction state or cannot be switched to the release state, and is in the release state when the first push rod is in the release state, but the attraction state of the tripping device can correspond to at least two state combinations of the two push rods, and the release state of the tripping device can also correspond to at least two state combinations of the two push rods; therefore, the tripping device can realize multiple states. BRIEF DESCRIPTION OF DRAWINGS

[0038] The above and other features, advantages, and aspects of the present disclosure will become more apparent by describing in detail the following specific embodiments thereof with reference to the attached drawings. Throughout the drawings, the same or similar reference numerals refer to the same or similar elements. It is to be understood that the drawings are schematic, and the sizes of the components and elements are not necessarily drawn to scale.

[0039] Figure 1 A structural schematic diagram of a tripping device provided by an embodiment of the application;

[0040] Figure 2 A state schematic diagram of a signal transmission assembly in a tripping device provided by an embodiment of the application;

[0041] Figure 3 Another state schematic diagram of a signal transmission assembly in a tripping device provided by an embodiment of the application;

[0042] Figure 4 Another state schematic diagram of a signal transmission assembly in a tripping device provided by an embodiment of the application;

[0043] Figure 5 Another state schematic diagram of a signal transmission assembly in a tripping device provided by an embodiment of the application;

[0044] Figure 6 Another state schematic diagram of a signal transmission assembly in a tripping device provided by an embodiment of the application;

[0045] Figure 7 Another structural schematic diagram of a tripping device provided by an embodiment of the application;

[0046] Figure 8Another structural schematic diagram of the trip unit provided by the embodiment of the present application is shown in FIG. 2.

[0047] Figure 9 Another structural schematic diagram of the trip unit provided by the embodiment of the present application is shown in FIG. 2.

[0048] Figure 10 A structural schematic diagram of the power converter provided by the embodiment of the present application is shown in FIG. 3. DETAILED DESCRIPTION

[0049] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application. The terms used in the embodiment part of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0050] The embodiments of the present application are described below in conjunction with the drawings, and obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application. Those of ordinary skill in the art know that, with the development of technology and the appearance of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0051] The terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, which is only a distinguishing way used in the description of the embodiments of the present application for the objects with the same attribute in the description. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that the processes, methods, systems, products or equipment containing a series of units do not have to be limited to those units, but can include other units not clearly listed or inherent to these processes, methods, products or equipment.

[0052] The embodiments of the present application provide a trip unit, so that the trip unit can realize multiple states. The specific scheme is as follows:

[0053] As shown in FIG. 1, Figure 1 The trip unit includes a signal receiving assembly 10 and an action assembly 20; wherein:

[0054] The two-way input end of the signal receiving assembly 10 receives a first signal and a second signal respectively; the first signal and the second signal can be derived from the related equipment of the system to which the switch body to which the tripping device is applied, such as the switch body on either side of the power converter, when the tripping device is configured, the first signal and the second signal can be derived from the controller of the power converter, or from other control devices connected to the power converter; it depends on the specific application environment, which is within the protection scope of the present application.

[0055] The action assembly 20, as shown in Figure 2 , includes a first push rod 201, a second push rod 202 and a baffle 203. The state of the first push rod 201 is controlled by the first signal through the signal receiving assembly 10, the state of the second push rod 202 is controlled by the second signal through the signal receiving assembly 10, and the baffle 203 is fixedly connected with the first push rod 201, which can be welded on the first push rod 201.

[0056] Both push rods have an attraction state and a release state, but the baffle 203 is fixedly connected with the first push rod 201, so there is a corresponding relationship between the position of the baffle 203 and the state of the first push rod 201; under normal circumstances, the position of the baffle 203 will change with the state change of the first push rod 201; but if the position of the baffle 203 is limited, it will affect the state realization of the first push rod 201.

[0057] In addition, through structural arrangement, the state of the second push rod 202 can affect the position of the baffle 203, for example, one state of the second push rod 202 can block the position change of the baffle 203 when the state of the first push rod 201 changes, thereby making the first push rod 201 unable to realize the corresponding state change; specifically, it can be arranged that when the first push rod 201 is in the attraction state and the second push rod 202 is in the release state, the baffle 203 is limited by the second push rod 202, so that the first push rod 201 cannot be switched to the release state; and in the case that the second push rod 202 is in the attraction state, the second push rod 202 releases the limiting of the baffle 203.

[0058] As shown in Figure 3 , the second push rod 202 is in the release state, at this time the second push rod 202 is located below the baffle 203, blocking the first push rod 201 from changing to the release state; at this time, even if the first signal controls the first push rod 201 to release, however, due to the baffle 203 being limited by the second push rod 202, the first push rod 201 cannot be switched from the attraction state to the release state, as shown in Figure 4 .

[0059] The second push rod 202 in the attracted state does not affect the position change of the baffle 203, that is, the limiting of the baffle 203 is released; at this time, the first push rod 201 can change the state according to the value of the first signal; Figure 2 The first push rod 201 in the attracted state is shown, Figure 5 The first push rod 201 in the released state is shown.

[0060] In addition, there is also a case that the first push rod 201 is switched from the attracted state to the released state, and then the second push rod 202 is switched from the attracted state to the released state, and finally forms a state as shown in Figure 6 In this case, since the first push rod 201 is released before the second push rod 202 is released, the release of the second push rod 202 will not constitute an obstacle to the release of the first push rod 201.

[0061] Moreover, the state of the tripper is controlled by the first push rod 201; when the first push rod 201 is in the attracted state (as shown in Figure 2 or Figure 3 ) or cannot be switched to the released state (as shown in Figure 4 ), the tripper is in the attracted state; when the first push rod 201 is in the released state (as shown in Figure 5 or Figure 6 ), the tripper is in the released state. When the tripper is in the attracted state, it does not affect the opening and closing of the switch body connected to the tripper, that is, the switch body can be freely opened and closed; when the tripper is in the released state, it will trip the switch body and achieve rapid disconnection.

[0062] Figures 2 to 6 In the above embodiment, only an example of the structure of the two push rods and the baffle 203 is given, and in actual application, it is not limited to this, and the structures of the three can also be changed, as long as the functions of limiting and releasing the baffle 203 can be achieved, which are within the protection scope of the present application.

[0063] The tripper provided by the embodiment has two push rods, which are respectively controlled by corresponding signals; moreover, when the second push rod 202 is in the attracted state, the first push rod 201 can be freely attracted and released; when the second push rod 202 is in the released state, the first push rod 201 cannot be released; furthermore, there are multiple combinations of the states of the two push rods, although the state of the tripper is controlled by the first push rod 201, the attracted state of the tripper can correspond to at least two combinations of the states of the two push rods (as shown in any one of Figures 2 to 4 , and the released state of the tripper can also correspond to at least two combinations of the states of the two push rods (as shown in Figure 5 or Figure 6 ); therefore, the tripper can realize multiple states.

[0064] In practical applications, the tripping device can include at least two attracted states and at least two released states, and there is a certain correspondence between the combination of the states of the two push rods and the states of the tripping device, such as:

[0065] (1) As shown in FIG. 1, the first push rod 201 and the second push rod 202 are both in the attracted state, in which case the state of the tripping device is one attracted state, which can be recorded as a first attracted state. Figure 2

[0066] (2) As shown in FIG. 2, the first push rod 201 is in the attracted state and the second push rod 202 is in the released state, in which case the state of the tripping device is another attracted state, which can be recorded as a second attracted state. Figure 3

[0067] (3) As shown in FIG. 3, the first push rod 201 cannot be switched from the attracted state to the released state due to the blocking of the baffle 203, and the second push rod 202 is in the released state, in which case the state of the tripping device is another attracted state, which can be recorded as a third attracted state. Figure 4

[0068] (4) As shown in FIG. 4, the first push rod 201 is in the released state and the second push rod 202 is in the attracted state, in which case the state of the tripping device is one released state, which can be recorded as a first released state. Figure 5

[0069] (5) As shown in FIG. 5, the first push rod 201 is switched to the released state first and the second push rod 202 is switched to the released state later, in which case the state of the tripping device is another released state, which can be recorded as a second released state. Figure 6

[0070] ​​​​​It is worth mentioning that at present, the switch body in the switch device is usually configured to use an under-voltage release or a split release. The control logic of the under-voltage release is that the under-voltage signal controls the attraction and release of the release, and when the under-voltage signal is de-energized, the release is released; when the under-voltage signal is energized, the release is attracted. The control logic of the split release is opposite to that of the under-voltage release, specifically: the split signal controls the attraction and release of the release, and when the split signal is energized, the release is released; when the split signal is de-energized, the release is attracted. Therefore, when the switch device is connected to the power converter and the power converter is powered off due to failure, the under-voltage release will be in a released state, so that the switch device is disconnected and cannot be closed, which can ensure the safety of the power converter and the maintenance personnel; but when the power converter works again, the AC needs to be powered on first and then manually closed by the maintenance personnel, which is troublesome for on-site maintenance. The split release will be in an attracted state when the power converter is powered off due to failure, and the switch device can be manually closed; but at this time, if the power converter failure has not been eliminated, the manual closing operation may cause the failure to expand.

[0071] The release provided in the embodiment can have the above-mentioned various working states through the cooperation of the first signal and the second signal, and can take into account the needs in different situations. Specifically, when the power converter enters a manually powered-off state or a failure power-off state from a non-running state, the release can be controlled to be in an attracted state, such as the third attracted state mentioned above, by the two signals, so that the connected switch body can be freely opened and closed, avoiding the cumbersome operation after failure elimination when using an under-voltage release. When the power converter enters a failure power-off state from a running state, the state of the release can be controlled to be a released state, such as the second released state mentioned above, by the two signals, so that the switch body is disconnected and cannot be closed, avoiding the risk of expanding the failure caused by manually closing when the failure has not been eliminated when using a split release. Thus, the functions of the traditional under-voltage release and the split release can be taken into account, and the disadvantages of using any one of the releases in the traditional scheme can be avoided.

[0072] On the basis of the above-mentioned embodiments, the release is provided with a specific implementation form in the embodiment, for example, the signal receiving assembly 10 therein can be as shown in Figure 7 which includes a first coil 101 and a second coil 102; wherein the two ends of the first coil 101 serve as one-way input terminals of the signal receiving assembly 10 to receive the first signal; and the two ends of the second coil 102 serve as another-way input terminals of the signal receiving assembly 10 to receive the second signal.

[0073] In this embodiment, when both signals are low level signals, the two coils make the release state of the release device through the action assembly 20, that is, the release device can be used as an under-voltage release device. In addition, the connection mode of the two ends of each coil is not limited in this embodiment, for example, for each coil: one end can receive the corresponding signal, and the other end can be connected to the reference ground (as shown in Figure 8 ), or the two ends can be connected to the corresponding pins of the source device of the corresponding signal (not shown); it depends on the specific application environment, which is within the protection scope of the present application.

[0074] In another example, in order to realize the above-mentioned second release state, that is, the first push rod 201 is switched to the release state before the second push rod 202, a corresponding energy storage device can be provided in the signal receiving assembly 10, such as a capacitor C as shown in Figure 8 , which is connected between the two ends of the second coil 102. In actual application, according to the required time difference between the release actions of the two push rods in this case, a capacitor C with a suitable capacitance can be selected to realize the energy storage device.

[0075] The correspondence between the level combination of each signal and the state combination of each push rod is described as follows:

[0076] (1) Both the first signal and the second signal are high level signals, corresponding to the first push rod 201 and the second push rod 202 being in the attracted state (as shown in Figure 2 ), in which case the state of the release device is the above-mentioned first attracted state.

[0077] (2) The first signal is a high level signal and the second signal is a low level signal, corresponding to the first push rod 201 being in the attracted state and the second push rod 202 being in the release state (as shown in Figure 3 ), in which case the state of the release device is the above-mentioned second attracted state.

[0078] (3) In the case where the second signal is a low level signal, the first signal is switched from a high level signal to a low level signal, corresponding to the first push rod 201 being unable to switch from the attracted state to the release state due to the blocking of the baffle 203, and the second push rod 202 being in the release state (as shown in Figure 4 ), in which case the state of the release device is the above-mentioned third attracted state.

[0079] For example, when the tripping device is in the second attracted state, the power converter fails to power off, so that the tripping device loses the first signal and the second signal; at this time, the second signal has been a low-level signal, the second push rod 202 is in the released state, and the position of the limiting baffle 203 is changed; and the first signal will change from a high-level signal to a low-level signal, but since the baffle 203 is limited, the first push rod 201 cannot be switched from the attracted state to the released state; the tripping device is in the third attracted state.

[0080] (4) The first signal is a low-level signal, and the second signal is a high-level signal, corresponding to the first push rod 201 in the released state and the second push rod 202 in the attracted state (as shown in Figure 5 ), in this case, the state of the tripping device is the first released state described above.

[0081] (5) The first signal and the second signal are both switched from a high-level signal to a low-level signal, corresponding to the first push rod 201 being switched to the released state first, and the second push rod 202 being switched to the released state later (as shown in Figure 6 ), in this case, the state of the tripping device is the second released state described above.

[0082] For example, when the tripping device is in the first attracted state, the power converter fails to power off, so that the tripping device loses the first signal and the second signal; for the tripping device, both signals will change from a high-level signal to a low-level signal; but since there is a capacitor C between the two ends of the second coil 102 to store energy, the second coil 102 will act later than the first coil 101, and the time can be controlled according to the size of the capacitor C, which is not limited here, as long as the tripping device can be tripped; in this case, the two ends of the first coil 101 change to a low-level signal first, and the two ends of the second coil 102 change to a low-level signal later, so that the first push rod 201 is released first, and the second push rod 202 is released later, and then the tripping device is in the second released state.

[0083] That is, when the first signal and the second signal are different control signals, the state of the tripping device is shown in Table 1 below; wherein the second released state is converted from the tripping device in the first attracted state, and the third attracted state is converted from the tripping device in the second attracted state.

[0084] Table 1 Correspondence between the level combination of two signals and the state of the tripping device

[0085] First signal Second signal Tripper status name High High First pull-in state High Low Second pull-in state Low High First release state Low Low Second release state Low Low Third pull-in state

[0086] In practical application, the first push rod 201 can be called as a main under-voltage push rod, and the second push rod 202 can be called as a secondary under-voltage push rod. The main under-voltage push rod is controlled by the first signal, and the secondary under-voltage push rod is controlled by the second signal. When the first signal and the second signal are powered on, the main under-voltage push rod and the secondary under-voltage push rod are attracted. When the first signal and the second signal are powered off, the main under-voltage push rod and the secondary under-voltage push rod are released. In addition, the baffle 203 is fixed on the main under-voltage push rod. Therefore, when the secondary under-voltage push rod is attracted, the main under-voltage push rod can be freely attracted and released. When the main under-voltage push rod is released, the main under-voltage push rod hits the pulling rod in the operating mechanism in the switch body, so that the connected switch body is tripped. When the secondary under-voltage push rod is released, the secondary under-voltage push rod blocks the baffle 203, so that the main under-voltage push rod cannot be released.

[0087] In the embodiment, two signals control the corresponding push rod to act through the corresponding coil. In cooperation with the setting of the baffle 203, the action assembly 20 has structural interlocking for the response of the two signals, so that the tripper is in different states under different controls.

[0088] In addition, the switch device can further include a reset mechanism (as shown in Figure 9 ). The inner side of the reset mechanism is mechanically connected with the first push rod 201 and the second push rod 202 respectively. The outer side of the reset mechanism is used to receive the reset operation for switching the tripper 32 from the released state to the attracted state.

[0089] After the fault is cleared in the power converter application system, the operator can reset the tripper 32 shown in Figure 9 by the reset mechanism, so that the switch body 31 can be controlled to close again. The end of the reset mechanism for receiving the reset operation can be in the form of a push button switch, a dial switch or a twist switch, which is not limited here and can be determined according to the specific application environment, which is within the protection scope of the present application.

[0090] In practical application, the action assembly 20 further includes corresponding permanent magnets, moving iron cores, static iron cores and springs, and the specific structure can be referred to the prior art, which will not be described here. After any coil receives the corresponding signal, the magnetic field formed will control the moving iron core to move, and then cause the action of the corresponding push rod. Therefore, each coil and the corresponding push rod can be regarded as an execution mechanism. Different signals can control the action of different execution mechanisms, so that the tripper realizes the corresponding state.

[0091] Another embodiment of the present application further provides a switch device, as shown in Figure 9 , comprising a switch body 31 and a tripper 32 as described in any of the above embodiments. The operating mechanism in the switch body 31 is controlled by the tripper 32. The specific structure and function of the tripper 32 can be referred to the above embodiments, which will not be described here.

[0092] The operating mechanism can specifically include: a jumper, a lock, and a traction rod; one end of the jumper is connected with the movable contact of the switch body connected with the release; the other end of the jumper is movably connected with one end of the lock; the state of the lock is controlled by the traction rod through the first push rod 201; when the release is in the attracted state, the jumper is locked by the lock; when the release is in the released state, the first push rod 201 strikes the traction rod, so that the jumper is separated from the lock. The other structural settings of the operating mechanism can refer to the prior art, and will not be described here.

[0093] When the release 32 is in the released state, the switch body 31 is disconnected and cannot be closed; when the release 32 is in the attracted state, the switch body 31 can be freely attracted.

[0094] The switch device can be used for isolation, conversion, and on-off of the circuit where the switch device is located. After the release 32 is installed on the switch body 31, the switch device has a corresponding release function, so that the switch device can quickly disconnect the switch body 31 through the release action of the release 32 when the equipment connected to the switch device fails, thereby realizing the fault protection function.

[0095] The switch device can be connected to any side of the power converter, such as the DC side or the AC side when the power converter is an inverter. The switch body 31 can include P movable contacts and P static contacts; P is a positive integer, each movable contact is controlled by an operating mechanism, and each movable contact is movably connected with a corresponding static contact. In an example, the positive and negative transmission branches of the DC side of the power converter can be controlled to be on or off, at this time, P = 2, and two movable contacts are movably connected with corresponding static contacts; that is, a set of static contacts and movable contacts suitable for cooperation are arranged in the positive transmission branch of the DC side of the power converter, and a set of static contacts and movable contacts suitable for cooperation are also arranged in the negative transmission branch of the DC side of the power converter, and the two movable contacts can act simultaneously. When the switch device can be connected to the three-phase AC side of the power converter, P = 3 can be taken, and the three movable contacts can also act simultaneously. In other cases, the value of P can be determined according to the specific application environment, such as when there are N transmission branches on the DC side, P = 2N can be taken, and the P movable contacts can also act simultaneously; other cases will not be described here, which are only some optional examples.

[0096] The switch device provided in the embodiment adopts the release 32 provided in the above embodiment, and through the multiple states that can be realized by the release 32, corresponding actions can be performed according to the state change of the equipment connected to the switch device, so that timely fault protection can be ensured, and targeted actions can be performed for faults under different conditions, the functions of the traditional under-voltage release and the split-field release are taken into account, and the shortcomings of separately using any one of the releases in the traditional scheme are avoided.

[0097] Another embodiment of the present application also provides a power converter, as shown in Figure 10 comprises a main circuit 01 and a controller 02; wherein:

[0098] Two sides of the main circuit 01 are respectively used as two sides of the power converter; the power converter can be an inverter, a converter, an intelligent combiner box, etc., which is not limited here and can be determined according to the specific application environment and is within the protection scope of the present application.

[0099] Moreover, a corresponding switching device 03 is arranged in at least one transmission branch of the power converter to realize the access or disconnection of the device connected to the side; specifically, the switching device 03 of any side of the power converter can be arranged inside or outside the power converter, for example, the switching device 03 can be connected outside the DC side of the power converter, or the switching device 03 can be connected between the DC side of the power converter and the DC side of the main circuit 01. The specific structure of the main circuit 01 can refer to the prior art, and the specific structure and principle of the switching device 03 can refer to the above embodiment, which will not be described here.

[0100] The main circuit 01 is controlled by the controller 02, and the controller 02 also outputs the first signal and the second signal to the tripping device 32 in the switching device 03.

[0101] The controller 02 controls the tripping device 32 by outputting the first signal and the second signal, so that the tripping device 32 has five working states, which are respectively a first attracted state, a second attracted state, a third attracted state, a first released state and a second released state; wherein the first attracted state, the second attracted state and the first released state are control states obtained by controlling the level of the first signal and the second signal; the third attracted state and the second released state are signal-free free states, wherein the third attracted state can only be obtained by the tripping device 32 losing power in the second attracted state, and the second released state can only be obtained by the tripping device 32 losing power in the first attracted state. Through the level combination of the two signals, the tripping device 32 has multiple working states, which can take into account the functions of traditional under-voltage tripping devices and separate excitation tripping devices, and avoid the shortcomings of separately using any one of the tripping devices in the traditional scheme.

[0102] In addition, the tripping device 32 of the switching device 03 can also be provided with a reset mechanism as shown in Figure 9 so that the tripping device 32 can be reset by the operator through the reset mechanism after the fault is cleared, so that the switching body 31 can be controlled to close again.

[0103] The same parts and features of each embodiment described in the specification can be mutually referred to, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiments, since they are basically similar to the device embodiments, they are described more simply, and the relevant parts can be referred to the part of the device embodiments. The above-described system and system embodiments are only illustrative, wherein the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. Those skilled in the art can understand and implement it without creative labor.

[0104] The skilled person can further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0105] The above description of the disclosed embodiments, the features recorded in each embodiment in the specification can be replaced or combined with each other, so that the skilled person in the art can implement or use the present application. Various modifications of the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A trip unit, characterized in that, include: Signal receiving component and action component; among which, The two input terminals of the signal receiving component receive the first signal and the second signal, respectively. The actuation component includes a first push rod, a second push rod, and a baffle. The state of the first push rod is controlled by a first signal through the signal receiving component, and the state of the second push rod is controlled by a second signal through the signal receiving component. The baffle is fixedly connected to the first push rod. When the first push rod is in the engaged state and the second push rod is in the released state, the baffle is limited by the second push rod, preventing the first push rod from switching to the released state. When the second push rod is in the engaged state, the limitation on the baffle is released. The state of the trip unit is controlled by the first push rod; when the first push rod is in the engaged state or cannot be switched to the released state, the trip unit is in the engaged state; when the first push rod is in the released state, the trip unit is in the released state.

2. The trip unit according to claim 1, characterized in that, When both the first push rod and the second push rod are in the engaged state, the trip unit is in the first engaged state; When the first push rod is in the engaged state and the second push rod is in the released state, the trip unit is in the second engaged state; When the first push rod cannot switch from the engaged state to the released state due to the baffle being limited, and the second push rod is in the released state, the trip unit is in the third engaged state; When the first push rod is in the released state and the second push rod is in the engaged state, the trip unit is in the first released state; When the first push rod switches to the release state first, and the second push rod switches to the release state later, the trip unit is in the second release state.

3. The trip unit according to claim 1, characterized in that, The signal receiving component includes: a first coil and a second coil; The two ends of the first coil serve as one input terminal of the signal receiving component to receive the first signal; The two ends of the second coil serve as another input terminal of the signal receiving component to receive the second signal.

4. The trip unit according to claim 3, characterized in that, The signal receiving component also includes: an energy storage device; The energy storage device is connected between the two ends of the second coil.

5. The trip unit according to claim 4, characterized in that, Both the first signal and the second signal are high-level signals, corresponding to the first push rod and the second push rod being in the engaged state; The first signal is a high-level signal and the second signal is a low-level signal, corresponding to the first push rod being in the engaged state and the second push rod being in the released state; When the second signal is a low-level signal, the first signal switches from a high-level signal to a low-level signal, which corresponds to the first push rod being unable to switch from the engaged state to the released state due to the baffle being limited, and the second push rod being in the released state. The first signal is a low-level signal and the second signal is a high-level signal, corresponding to the first push rod being in the released state and the second push rod being in the engaged state; Both the first signal and the second signal are switched from a high level signal to a low level signal, corresponding to the first push rod switching to the release state first and the second push rod switching to the release state later.

6. The trip unit according to any one of claims 1 to 5, characterized in that, Also includes: Reset mechanism; The inner side of the reset mechanism is mechanically connected to the first push rod and the second push rod respectively; The outer side of the reset mechanism is used to receive a reset operation that switches the trip unit from the released state to the engaged state.

7. A switching device, characterized in that, include: The switch body and the trip unit as described in any one of claims 1 to 6; The operating mechanism in the switch body is controlled by the trip unit.

8. The switching device according to claim 7, characterized in that, The switch body includes: P moving contacts and P stationary contacts; P is a positive integer; Each of the moving contacts is controlled by the operating mechanism; Each of the moving contacts is movably connected to the corresponding stationary contact.

9. A power converter, characterized in that, include: Main circuit and controller; among which, The two sides of the main circuit serve as the two sides of the power converter; The power converter is provided with a switching device as described in claim 7 or 8 in at least one transmission branch; The main circuit is controlled by the controller; The controller also outputs a first signal and a second signal to the trip unit in the switching device.

10. The power converter according to claim 9, characterized in that, The switching device on either side of the power converter is located inside or outside the power converter.

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