WO2022258525A1 - Schaltvorrichtung - Google Patents
Schaltvorrichtung Download PDFInfo
- Publication number
- WO2022258525A1 WO2022258525A1 PCT/EP2022/065211 EP2022065211W WO2022258525A1 WO 2022258525 A1 WO2022258525 A1 WO 2022258525A1 EP 2022065211 W EP2022065211 W EP 2022065211W WO 2022258525 A1 WO2022258525 A1 WO 2022258525A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- contact
- switching device
- contact bridge
- yoke element
- upper yoke
- Prior art date
Links
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/546—Contact arrangements for contactors having bridging contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
- H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
- H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
- H01H50/42—Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement
Definitions
- a switching device is specified.
- the switching device is designed in particular as an electromagnetically acting, remote-controlled switch that can be operated by electrically conductive current.
- the switching device can be activated via a control circuit and can switch a load circuit.
- the switching device can be designed as a relay or as a contactor, in particular as a power contactor.
- the switching device can particularly preferably be designed as a gas-filled power contactor.
- a possible application of such switching devices, in particular power contactors, is the opening and disconnection of battery circuits, for example in motor vehicles such as electrically or partially electrically operated motor vehicles.
- a contactor In its function as a safety component, a contactor is usually used in combination with a fuse between a battery, such as a lithium-ion battery, and an electric motor and must be able to disconnect the power source from the load in the event of a malfunction.
- a serious case of a battery malfunction is a short circuit within the battery which, depending on the battery, can lead to a very rapid discharge with currents in the kiloampere range and thus a multiple of the nominal current when the battery is fully charged.
- the main task of the contactor is to withstand this very high current for a for a short time, for example in the range of milliseconds, until the upstream fuse can safely disconnect the current or the current is reduced due to an increasing internal resistance of the battery.
- a contactor usually has a switching bridge that can be moved by a magnetic drive and, when the contactor is switched on, electrically conductively connects, for example, two fixed main contacts.
- a high short-circuit current occurs, however, strong Lorentz forces are created by the magnetization of the conductors, which push the jumper away from the main contacts. This phenomenon is also known as levitation.
- the levitation can cause an unwanted arc between the main contacts and the bridge, which burns at a very high temperature. This can destroy the contactor.
- a magnetic field proportional to the current strength forms around a current-carrying conductor.
- the magnetic field caused by the current flowing in the switching bridge is bundled in iron parts, which attract each other as a result.
- the attractive force is also known as the reluctance force, which can be used to push the jumper closer to the main contacts and prevent the contactor from opening.
- the publication CN 209000835 U describes an anti-levitation device in which a switching bridge is preloaded with a compression spring and held between an insulator and a holding cage.
- the switching bridge is divided into two current paths in the middle. Both paths are surrounded by an iron plate and an iron clamp, with the iron plates locked to the holding cage and the iron clips attached to the jumper.
- At least one object of certain embodiments is to specify a switching device.
- a switching device has at least one stationary contact and at least one movable contact.
- the movable contact can in particular have or be a contact bridge.
- the contact bridge can be a movable contact of the switching device or part of a movable contact of the switching device. Properties and features of the movable contact described below can thus be corresponding properties and features of the contact bridge and vice versa.
- the switching device can particularly preferably have a contact arrangement which has the movable contact, ie the contact bridge.
- the at least one fixed contact and the at least one movable contact are provided and set up to switch on and off a load circuit that can be connected to the switching device.
- the movable contact i.e. in particular the contact bridge of the contact arrangement, can be moved in the switching device between a non-connecting state and a connecting state of the switching device in such a way that the movable contact, i.e. in particular the contact bridge of the contact arrangement, can be moved in the non-connecting state of the switching device spaced from the at least one fixed contact and is therefore galvanically isolated and, in the switched-through state, has a mechanical contact with the at least one fixed contact and is therefore galvanically connected to the at least one fixed contact.
- the switching state is also referred to as the switched-on state of the switching device, while the non- switched-through state is referred to as the switched-off state of the switching device.
- the switching device particularly preferably has at least two fixed contacts which are arranged separately from one another in the switching device and which are electrically conductive in the manner described above depending on the state of the movable contact, i.e. in particular the contact bridge, through the movable contact, i.e. in particular the contact bridge connected to each other or electrically separated from each other.
- the contact bridge preferably has an upper side with at least one contact area and an underside lying opposite the upper side. In the switched-through state of the switching device, the at least one contact area of the contact bridge is in mechanical contact with the at least one fixed contact, in particular a contact area of the at least one fixed contact. If the switching device has two fixed contacts, for example, the contact bridge can have two contact areas accordingly.
- the general term "contacts" can refer in particular to all fixed contacts as well as to the contact bridge or the contact arrangement with the contact bridge.
- the contacts can have or be made of a metal, preferably copper or a copper alloy.
- a composite material in the form of a metallic matrix material, preferably with or made of copper, and particles distributed therein, preferably with or made of a ceramic material such as aluminum oxide, is also possible.
- the switching device has a housing in which the contact arrangement and the at least one fixed contact or the at least two fixed contacts are arranged.
- the contact arrangement can be arranged completely in the housing.
- a stationary contact is arranged in the housing can mean in particular that at least the contact area of the stationary contact, which is in mechanical contact with the movable contact in the switched-through state, is arranged inside the housing.
- a fixed contact arranged in the housing can be electrically contacted from the outside, ie from outside the housing.
- a part of a stationary contact arranged in the housing can project out of the housing and have a connection option for a supply line outside the housing.
- the contacts are arranged in a gas atmosphere in the housing.
- the contact arrangement is arranged completely in the gas atmosphere in the housing and that at least parts of the fixed contact or contacts, such as the contact area or areas of the fixed contact or contacts, are arranged in the gas atmosphere in the housing.
- the switching device can particularly preferably be a gas-filled switching device such as a gas-filled contactor.
- the contacts which means the contact arrangement is complete and at least parts of the fixed contact or contacts, in one Switching chamber arranged within the housing.
- a gas ie at least part of the gas atmosphere described above, can be located in the switching chamber.
- the gas can preferably have a proportion of at least 20% H2 and preferably at least 50% H2.
- the gas can include an inert gas, particularly preferably N 2 and/or one or more noble gases.
- the contact bridge in the switching device can be moved by means of an axis.
- the contact arrangement in the switching device can be moved by means of the axis.
- the contact bridge and particularly preferably the contact arrangement can be movable by means of a magnet armature which has the axis.
- the axle can be connected at one end directly or indirectly to the contact bridge in such a way that the contact bridge can be moved by means of the axle, ie when the axle moves it is also moved by it.
- the axle can be connected at one end to the contact arrangement in such a way that the contact arrangement can be moved by means of the axle, ie is also moved by the axle when the axle moves.
- the axis can project into the switching chamber through an opening in the switching chamber.
- the magnet armature can be moved by a magnetic circuit in order to bring about the switching operations described above.
- the magnetic circuit can have a yoke which has an opening through which the axis of the magnet armature protrudes.
- the axle can preferably include or be made of stainless steel.
- the yoke can preferably have or be made of pure iron or a low-doped iron alloy.
- the contact arrangement has a holding element.
- the holding element can in particular be fastened to the axle.
- the holding element and thus the contact arrangement can be locked on the axis. This can be possible, for example, by means of a snap ring or riveting on the axle.
- the holding element and thus the contact arrangement can be screwed onto the axle.
- the holding element can have, for example, a hole with a thread or with a formed threaded bushing with a thread, with which the holding element can be screwed onto a thread of the axle.
- the holding element can be locked on the axle in this case, for example also by means of a snap ring and/or a rivet and/or a lock nut.
- the axle can also be possible for the axle to be fixed in the holding element by a clamp and/or for a part of the axle to be formed with the material of the holding element.
- the axis can preferably have one or more anchoring elements such as, for example, one or more grooves and/or one or more projections, which can run completely or partially around the axis.
- the switching device has an upper yoke element.
- the upper yoke element is particularly preferably arranged separately from the contact bridge and particularly preferably separately from the contact arrangement in the switching device.
- the upper yoke element can be arranged and fastened immovably in the switching device.
- the switching device has, in addition to the upper yoke element lower yoke element.
- the contact arrangement has the lower yoke element.
- the lower yoke element is thus preferably part of the contact arrangement.
- the upper yoke member or the upper yoke member and the lower yoke member may each comprise or be made of iron.
- the upper yoke element or the upper yoke element and the lower yoke element can each comprise or be made of pure iron.
- the upper yoke element is preferably not part of the contact arrangement, but is arranged independently of the contact arrangement and thus, in the event that the contact arrangement has the lower yoke element, in particular independently of the lower yoke element in the switching chamber.
- the upper yoke element is particularly preferably arranged and locked in an unchangeable manner with regard to its position relative to the at least one stationary contact.
- the upper yoke member may be attached to the interrupter.
- the upper yoke element can be attached to an inside of the switching chamber, preferably by soldering or gluing.
- the upper yoke element can also be fastened to the switching chamber by riveting or screwing.
- the upper yoke element can be held on the inside of the switching chamber, for example by means of a fastening part, for example made of a plastic.
- the upper yoke element can be fixed in the switching chamber by caulking.
- the upper yoke element can be loosely inserted into the switching chamber or a part of the switching chamber and can be locked in the switching chamber during assembly, particularly preferably with a positive fit, by clamping or caulking.
- the upper yoke element is not part of the contact arrangement can advantageously be achieved in contrast to the prior art described above, that the upper yoke element is not moved during the switching movement of the contact arrangement.
- the upper yoke element can, for example, be designed with larger dimensions than conventional yoke elements in the prior art, since the mass of the upper yoke element is irrelevant with regard to the switching movement.
- the lower yoke element is slidably mounted on the holding element. Accordingly, the position of the lower yoke element relative to the upper yoke element can change on the one hand by a movement of the lower yoke element in the contact arrangement.
- An air gap between the lower yoke element and the upper yoke element can thus be variable, in particular even when the switching device is switched on.
- the position of the lower yoke element can change relative to the upper yoke element by a movement of the contact arrangement in the switching chamber.
- the lower yoke element is particularly preferably mounted on the holding element so that it can be displaced in a direction parallel to the axis.
- the contact bridge is arranged on the holding element.
- the contact bridge can be slidably mounted on the holding element.
- the contact bridge can be mounted on the holding element so that it can be displaced in a direction parallel to the axis.
- the fact that an element, i.e. in particular the lower yoke element and/or the contact bridge, is slidably mounted on the holding element can mean in particular that said element can be moved in relation to the holding element in preferably only one direction, which can also be referred to as the direction of movement and at the same time its freedom of movement is restricted by the holding element.
- the freedom of movement can be restricted along the direction of movement, so that the displaceability along the direction of movement is limited to a certain distance.
- the freedom of movement in directions other than the direction of movement is preferably at least considerably restricted, except for tolerances.
- the contact bridge, the lower yoke element and the upper yoke element are particularly preferably mounted in pairs so that they can be moved relative to one another.
- the contact bridge and the lower yoke element are movably mounted relative to one another, since the contact bridge and/or the lower yoke element are movably mounted on the holding element.
- the contact bridge and, if present, the lower yoke element are movably mounted relative to the upper yoke element, which can be achieved, for example, in that the contact bridge and, if present, the lower yoke element are parts of the movable contact arrangement, whereas the upper yoke element is not part of the Contact arrangement is.
- the holding element can have at least one guide element for guiding the contact bridge and/or the lower yoke element.
- the at least one guide element can, for example, by a Be formed guide rail and can in particular allow a guide and thus a direction of movement along the direction parallel to the axis.
- the holding element particularly preferably has a plurality of guide elements.
- the guide elements can preferably also be used to limit mobility in a direction other than the desired direction of movement.
- the holding element can have at least one stop for limiting the displacement of the contact bridge and/or the lower yoke element.
- the at least one stop can in particular effect a limitation along the direction of movement and thus preferably along the direction parallel to the axis.
- the holding element can particularly preferably have a plurality of stops.
- the holding element can have at least one clamp element, which has the at least one guide element and the at least one stop and which at least partially encompasses the contact bridge and/or the lower yoke element.
- the at least one clamp element can be arranged, for example, on a base plate of the holding element.
- the clamp element can have a stop which is connected to the base plate via two guide elements, so that the guide elements and the stop of the clamp element together with the base plate surround an opening.
- the contact bridge and/or the lower yoke element can protrude through the opening.
- the holding element particularly preferably has at least two clamp elements.
- the contact bridge is arranged between the base plate of the holding element and the upper yoke element.
- the contact bridge between the lower yoke element and the upper yoke element is arranged.
- the upper yoke element can be arranged above the contact arrangement when viewed from the axis.
- the contact bridge can have an upper side and an underside opposite the upper side, with the lower yoke element, if present, being arranged under the contact bridge and thus on the underside of the contact bridge, while the upper yoke element is arranged over the contact bridge and thus on the upper side of the contact bridge .
- the upper yoke element has a recess on an underside facing the contact bridge.
- the indentation can in particular be designed as a channel-like or groove-like indentation.
- the contact bridge can partially protrude into the depression.
- the depression can have a width which, at least in the region of the depression, is greater than a width of the contact bridge.
- the contact bridge can have a constriction, that is to say an area with a reduced width, the constriction being arranged at least partially in the depression of the upper yoke element when the switching device is switched on.
- the depression can have a depth which, at least in the region of the depression, is equal or essentially equal to a thickness of the contact bridge.
- the contact bridge can also have a thickness that is greater than the depth of the depression.
- the contact bridge can also be spaced apart from the upper yoke element when it is switched on. In other words, the contact bridge cannot have any mechanical contact with the upper yoke element when it is switched on. Accordingly, an air gap can also remain between the upper yoke element and the contact bridge when switched on.
- the holding element has an electrically insulating material.
- the holding element is particularly preferably made of one or more electrically insulating materials, so that the holding element can be electrically insulating.
- the electrically insulating material or materials can be selected from polymers and ceramic materials, for example selected from polyoxymethylene (POM), in particular with the structure (CH 2 0) n / polybutylene terephthalate (PBT), glass fiber-filled PBT and electrically insulating metal oxides such as Al 2 O3 .
- POM polyoxymethylene
- PBT polybutylene terephthalate
- the holding element can electrically insulate the contact bridge or preferably the contact bridge and the contact spring as well as the lower yoke element from the axis.
- the contact bridge can be mounted in an electrically insulated manner from the components of the magnet drive, ie in particular from the other components of the magnet armature.
- the holding element can thereby enable the contact bridge to be supported and the contact bridge to be electrically insulated at the same time.
- the upper yoke element can be arranged laterally next to the at least one stationary contact. Directions that are perpendicular to the axis of the magnet armature are referred to as "lateral" here and in the following.
- the switching device has two fixed contacts and the upper yoke element is arranged between the two fixed contacts.
- the retaining element may have a part, such as a stop described above, which protrudes into a gap between the at least one stationary contact and the upper yoke element when the switching device is switched on.
- a part such as a stop described above
- electrical insulation of the upper yoke element from the at least one fixed contact can be achieved.
- the holding element can preferably correspondingly have two parts such as two abutments, each of the abutments in an switched-on state of the switching device entering a gap between one of the fixed contacts and the upper yoke element can protrude.
- the contact arrangement also has a spring, which can also be referred to below as a contact spring and which is arranged on an underside of the contact bridge which is remote from the upper yoke element. If the contact arrangement also has the lower yoke element, the contact spring is thus arranged on the underside of the contact bridge facing the lower yoke element.
- the contact spring can particularly preferably press the contact bridge in the direction of the at least one stationary contact. during one Switching process of the switching device from a switched-off state to a switched-on state, the magnet armature and thus the axis and the contact arrangement preferably move in a linear movement in the form of a lifting or lowering movement along the axis, which can also be referred to as the vertical direction.
- the axis and, for example, a magnetic core of the magnet armature preferably have a freedom of movement for the lifting movement in the vertical direction that is larger than the switching gap that is formed by the distance between the at least one fixed contact and the contact bridge in the non-switching state.
- This can be made possible, for example, by a gap between the magnetic core and the yoke of the magnetic circuit, which can also be referred to as the movement gap, being larger than the switching gap in the switched-off state.
- the magnet anchor with the contact arrangement can be an overtravel system in which the contact bridge is arranged displaceably on the holding element.
- the movement gap can be less than or equal to 1 mm and particularly preferably about 0.5 mm larger than the switching gap.
- the contact spring is arranged between the contact bridge and the base plate of the holding element or, in the case of an existing lower yoke element, between the contact bridge and the lower yoke element, so that the contact spring tends to contact the contact bridge and base plate or the contact bridge and the lower to push the yoke apart.
- the contact spring thus generates in particular a spring force which counteracts the lower yoke element coming closer to the base plate or to the contact bridge.
- the spring can be supported, preferably directly, on the underside of the contact bridge and on the base plate or on the lower yoke element.
- the lower yoke element can have a depression into which the spring protrudes and which can fix the position of the contact spring.
- the holding element in particular the base plate, can have a spring holder which counteracts displacement of the contact spring on the holding element.
- the spring retainer may include or be formed from a peg surrounded by a portion of the contact spring.
- a magnetic field is induced in the upper yoke element when a current flows through the contact bridge.
- the magnetic field lines can concentrate on the upper side of the upper yoke element. Since the field strives for the shortest path to energy minimization, the field on the underside facing the contact bridge and through the contact bridge is strongly compressed and generates a reluctance force on the contact bridge, which counteracts the levitation force and is also known as Anti-levitation force can be called. A holding effect can thus be achieved by a flow of the magnetic field from the upper yoke element through the contact bridge.
- the contact bridge is particularly preferably arranged, as described above, between the upper yoke element and the lower yoke element.
- the yoke elements can also in this case absorb magnetic fields that arise when a current flows through the contact bridge. This means that in this case the two yoke elements are magnetized by a magnetic field created by the current-carrying contact bridge in such a way that an attractive force is created between them.
- the lower yoke element can be pulled upwards, ie in the direction of the upper yoke element, by the resulting attraction force between the yoke elements.
- This effect can increase the holding effect described above.
- the contact spring allows the lower yoke element to exert a force on the contact bridge, so that the contact bridge is also additionally pressed upwards and thus in the direction of the at least one fixed contact.
- the force of attraction acting between the yoke elements is all the stronger, the greater the electrical current that flows through the contact bridge.
- the contact spring tries to push the lower yoke element away from the contact bridge and thus also from the upper yoke element, and the lower yoke element is movably mounted on the holding element, the spring force can pass through with sufficiently small electrical currents the contact bridge must be greater than the attraction force between the yoke elements. Only when the force of attraction between the yoke elements exceeds the spring force of the contact spring can the lower yoke element move in the direction of the upper yoke element and thus press the contact bridge more strongly against the at least one fixed contact by means of the now more compressed contact spring. In this way, the levitation effect described above, in particular in the case of a short-circuit current, can be counteracted to an increased extent.
- an electric current can flow through the contact bridge, which generates a magnetic flux that causes an attraction between the contact bridge and the upper yoke element and, if present, between the lower yoke element and the upper yoke element.
- the contact arrangement has the lower yoke element
- the contact arrangement and the upper yoke element are designed such that the lower yoke element is arranged at a first distance from the upper yoke element when the electric current is less than a current threshold and that when the electric current is greater than the current threshold the lower yoke member is disposed a second distance from the upper yoke member, the second distance being less than the first distance.
- the first and second spacing can correspond, for example, to the respective size of the air gap, which thus becomes smaller when the current threshold is exceeded. Accordingly, the air gap between the lower yoke element and the upper yoke element is dependent on an electric current flowing through the contact bridge during operation of the switching device.
- the air gap and thus the first distance can be more than 1 mm, for example up to 3 mm or even up to 5 mm, and thus in comparison to the prior art described above, in which the air gap is still also essentially unchangeable , be considerably larger.
- the air gap and thus the second distance can be less than 1 mm and particularly preferably equal to 0 or at least approximately 0.
- the lower yoke element can be pulled so far against the upper yoke element that the lower yoke element rests against the upper yoke element or at least an air gap of less than 1mm.
- the current threshold can be set by a suitable choice of the spring constant of the contact spring and the geometric design and size of the yoke elements and the first distance.
- the current threshold can be set in such a way that electrical currents, which correspond to normal operation of the switching device, are below the current threshold. This can ensure that in normal operation and, for example, also for small short-circuit currents, the attraction force between the yoke elements is low due to the large air gap with the first distance, so that no increased contact pressure is generated between the contact bridge and the at least one fixed contact and the contact bridge alone is held by the contact spring on at least one fixed contact.
- the lower yoke element only moves when the current threshold is exceeded by a higher short-circuit current upper yoke element, so that stronger levitation forces can be compensated by the attraction of the yoke elements.
- the air gap is thus designed to be variable, as described, depending on the electrical current that flows through the contact bridge, as a result of which the holding force is also variable. It can be achieved that the additional holding force caused by the lower yoke element is only "switched on" by the yoke elements in the event of a short circuit, in that the lower yoke element closes the magnetic circuit with the upper yoke element.
- the upper yoke element is preferably fixed directly to the switching chamber, it is no longer dependent on the holding force of the magnetic drive of the switching device and thus on the holding force of the coil, as is the case in the prior art described above is.
- the upper yoke element of the switching device described here can therefore absorb large forces, in particular forces of more than 500 N.
- the forces caused by yoke elements are typically limited to around 100 N, since these are only as large as the holding force of the magnetic drive coil. Consequently, significantly larger short-circuit currents are possible with the switching device described here.
- the anti-levitation effect described here can essentially be achieved with just one additional component, namely the upper yoke element.
- the lower yoke element that can also be provided and thus with the upper and lower yoke element, and can also be switched on in a targeted manner.
- the arrangement of the upper yoke element on the switching chamber can ensure that the upper yoke element is not moved during switching. This reduces the dynamic mass in favor of a faster shifting process.
- Figure 1 shows a schematic representation of an example of a switching device
- FIGS. 1A to 2F show schematic representations of
- Figure 3 shows a schematic representation of the effect of the upper yoke element on the contact bridge
- FIGS. 4A and 4B show schematic representations of parts of a switching device according to further embodiments
- FIGS. 5A to 5D show schematic representations of
- FIGS. 6A to 6D show schematic representations of sections of a switching device according to further exemplary embodiments.
- FIG. 1 shows an example of a switching device 100 which can be used, for example, to switch high electrical currents and/or high electrical voltages and which can be a relay or contactor, in particular a power contactor.
- FIG. 1 shows a three-dimensional sectional view with a vertical sectional plane. The geometries shown are only to be understood as examples and not as restrictive and can also be configured alternatively.
- the switching device 100 has contacts 1 in a housing (not shown), which are also referred to below as switching contacts.
- the housing primarily serves as protection against accidental contact for the components arranged inside and has or is made of a plastic, for example PBT or glass fiber-filled PBT.
- the switching device 100 has two fixed contacts 2 as contacts 1 and a movable contact in the form of a contact bridge 4 mounted on an insulator 3 .
- the contact bridge 4 is designed as a contact plate.
- the fixed contacts 2 together with the contact bridge 4 form the switching contacts.
- other numbers of contacts 1, ie other numbers of fixed and/or movable contacts can also be possible.
- the fixed contacts 2 and/or the contact bridge 4 can, for example, be made with or made of Cu, a Cu alloy, one or more high-melting metals such as Wo, Ni and/or Cr, or a mixture of the materials mentioned, for example copper with at least one another metal, for example Wo, Ni and/or Cr.
- the switching device 100 is shown in a switched-off state, in which the contact bridge 4 is spaced from the fixed contacts 2, so that the contacts 2, 4 are electrically isolated from one another.
- the design of the switching contacts shown and in particular their geometry are purely exemplary and not to be understood as limiting. Alternatively, the switching contacts can also be designed differently.
- the switching device 100 has a movable magnet armature 5, which essentially completes the switching movement.
- the magnet armature 5 has a magnetic core 6, for example with or made of a ferromagnetic material. Furthermore, the magnet armature 5 has an axis 7 which is guided through the magnetic core 6 and is firmly connected to the magnetic core 6 at one end of the axis. At the other end of the axis, opposite the magnetic core 6 , the magnet armature 5 has the contact bridge 4 .
- the axis 7 can preferably be made with or made of stainless steel.
- the insulator 3 which can also be referred to as a bridge insulator, is arranged between them.
- a contact spring 34 is arranged below the contact bridge 4, which is supported on the insulator 3 and which exerts a force in the direction of the fixed contacts 2 on the Contact bridge 4 exerts.
- the magnetic core 6 is surrounded by a coil 8 .
- a current flow in the coil 8 that can be switched on from the outside by a control circuit generates a movement of the magnetic core 6 and thus of the entire magnet armature 5 in the axial direction until the contact bridge 4 makes contact with the stationary contacts 2 .
- the magnet armature moves upwards for this purpose.
- the magnet armature 5 thus moves from a first position, a rest position, which corresponds to the isolating, ie non-switching and therefore switched-off state, into a second position, which corresponds to the active, ie conducting and therefore switched-on state.
- the contacts 1 are galvanically connected to one another.
- the switching device 100 has a yoke 9, which can have or be made of pure iron or a low-doped iron alloy and which forms part of the magnetic circuit.
- the yoke 9 has an opening in which the axle 7 is guided. If the flow of current in coil 8 is interrupted, magnet armature 5 is moved back into the first position by one or more springs 10 . In the illustration shown the magnet armature 5 thus moves back down. The switching device 100 is then again in the idle state, in which the contacts 1 are open.
- the direction of movement of the magnet armature 5 and thus of the contact bridge 4 is also referred to as the vertical direction 91 below.
- the arrangement direction of the fixed contacts 2, which is perpendicular to the vertical direction 91, is hereinafter referred to as the longitudinal direction 92.
- the direction perpendicular to the vertical direction 91 and perpendicular to the longitudinal direction 92 is referred to below as the transverse direction 93 .
- the directions 91, 92 and 93 which also apply independently of the switching movement described, are indicated in some figures to facilitate orientation. Directions that are parallel to a plane spanned by the longitudinal direction 92 and the transverse direction 93 and are therefore perpendicular to the vertical direction 91 are also referred to as lateral directions 90 .
- the contacts 1 can be arranged in a gas atmosphere, so that the switching device 100 as a gas-filled relay or gas-filled contactor can be formed.
- the contacts 1 are arranged within a switching chamber 11, for example formed by a switching chamber wall 12 and a switching chamber floor 13, in a gas-tight area 14 formed by a hermetically sealed part, it being possible for the switching chamber 11 to be part of the gas-tight area 14.
- the gas-tight area 14 completely surrounds the magnet armature 5 and the contacts 1, except for parts of the fixed contacts 2 which are intended for external connection.
- the gas-tight area 14 and thus also the interior 15 of the switching chamber 11 are filled with a gas.
- the gas-tight area 14 is essentially formed by parts of the switching chamber 11, the yoke 9 and additional walls.
- the gas that can be filled into the gas-tight area 14 through a gas filler neck during the production of the switching device 100 can particularly preferably contain hydrogen, for example with 20% or more H2 in an inert gas or even with 100% H2, since Gas containing hydrogen can promote the extinguishing of arcs.
- so-called blowout magnets can be present inside or outside of the switching chamber 11, ie permanent magnets 16, which cause an extension of the arc gap and can thus improve the extinguishing of the arcs.
- the switching chamber wall 12 and the switching chamber floor 13 can be made, for example, with or from a metal oxide such as Al2O3.
- plastics with a sufficiently high temperature resistance are also suitable, for example a PEEK, a PE and/or a glass fiber-filled PBT.
- the switching chamber 11 can at least partially also have POM, in particular with the structure (C ⁇ O) ⁇ .
- POM in particular with the structure (C ⁇ O) ⁇ .
- Such a plastic can be characterized by a comparatively low proportion of carbon and a very characterized by a low tendency to form graphite. Due to the equal proportions of carbon and oxygen, in particular in the case of (CH2O) n , predominantly gaseous CO and H2 can be produced in the event of heat and, in particular, arc-induced decomposition. The additional hydrogen can enhance arc quenching.
- the switching device 100 can also be designed without a gas filling.
- the above description of the example in FIG. 1 serves to clarify the functioning of switching devices.
- Exemplary embodiments of a switching device 100 are shown below which, in comparison to the switching device in FIG.
- FIG. 2A shows a three-dimensional sectional illustration of part of the switching device 100 with the contact arrangement 200
- FIGS. 2B to 2F show different views of parts of the switching device 100 and in particular of the contact arrangement 200.
- the following description of the switching device 100 relates equally to all of Figures 2A to 2F. Unless stated otherwise the elements shown in FIGS. 2A to 2F correspond to the elements explained in connection with FIG.
- the housing 19 of the switching device 100 is additionally shown in FIG. 2A.
- the contact arrangement 200 is arranged in the switching chamber 11 , has the contact bridge 4 and a holding element 30 and is fastened to the axle 7 .
- the contact arrangement 200 can be moved by the magnetic drive described above in order to carry out the switching movements of the switching device 100 .
- the switching device 100 has an upper yoke element 50 .
- the upper yoke member 50 may include or be made of iron.
- the upper yoke member 50 may include or be made of pure iron.
- the contact bridge 4 is arranged below the upper yoke element 50 by the holding element 30 .
- the upper yoke element 50 is not part of the contact arrangement 200 but is arranged independently of the contact arrangement 200 and thus independently of the lower yoke element 40 in the switching chamber 11 .
- the upper yoke member 50 is disposed and fixed relative to the fixed contacts 2 therebetween.
- the upper yoke element 50 and the stationary contacts 2 are preferably attached to the switching chamber 11, in particular the switching chamber wall 12, which can have a ceramic material, for example, in order to enable sufficient stability.
- the upper yoke element 50 and the stationary contacts 2 can each be attached to the switching chamber by soldering.
- the upper yoke element 50 can have a soldering flange exhibit.
- the upper yoke element 50 can be fixed to an inside of the switching chamber 11 by soldering.
- the upper yoke element 50 can also be fastened to the switching chamber 11 by gluing, riveting, screwing or caulking.
- the holding element 30 is attached to the axle 7 .
- the holding element 30 has an electrically insulating plastic, in particular a plastic described above in the general part, with part of the axis 7 being formed with the material of the holding element 30, as can be seen in FIG. 2A.
- the axis 7 has an anchoring element in the form of grooves which run all the way around the axis 7 and into which the material of the holding element 30 can engage.
- another fastening method is also possible, for example by means of rivets or screws.
- the holding element 30 has a base plate 31 which is attached to the axle 7 . As indicated in FIGS. 2B and 2C, the holding element 30 has on the base plate 31 clamping elements 32 for the movable mounting of the contact bridge 4.
- the holding element 30 can particularly preferably be formed in one piece and have a material as described above in the general part.
- the contact bridge 4 is slidably mounted on the holding element 30 by the clamp elements 32 . In particular, the contact bridge 4 is slidably mounted on the holding element along a direction of movement that is parallel to the axis 7 .
- the holding element 30 has guide elements 36 and stops 37, which form the clamp elements 32.
- the guide elements 36 are designed as guide rails and allow movement of the contact bridge 4 along the desired displacement direction, while the mobility of the contact bridge 4 is restricted in other directions by the guide elements 36.
- the holding element 30 has stops 37, which are arranged on a side of the guide elements 36 opposite the base plate 31.
- two guide elements and a stop 37 each form a clamp element 32 which forms an opening 38 with the base plate 31 in each case.
- each of the clamp elements 32 encompasses the contact bridge 4.
- the contact bridge 4 can protrude through the openings 38 and can thereby be guided within the openings 38 of the clamp elements 32.
- the holding element 30 can also be designed in such a way that the stops 37 protrude into an intermediate space between a fixed contact 2 and the upper yoke element 50 when the switching device 100 is switched on, as can be seen in FIG. 2A. As a result, at least partial electrical insulation of the upper yoke element 50 from the stationary contacts 2 can be achieved, for example.
- the contact arrangement 200 also has a contact spring 34 which is arranged on the underside of the contact bridge 4 facing the base plate 31 .
- the contact spring 34 is arranged between the contact bridge 4 and the base plate 31 .
- the holding element 30 and in particular the base plate 31 of the holding element 30 has a spring holder 39 which is a displacement of Contact spring 34 on the holding element 30 counteracts.
- the spring retainer 39 may include or be formed from a spigot surrounded by a portion of the contact spring 34 .
- the contact spring 34 is designed as a compression spring. As described above, a contact pressure of the contact bridge 4 on the stationary contacts 2 can be increased by the contact spring 34 in conjunction with an overtravel. Due to the fact that the contact spring 34 is arranged between the contact bridge 4 and the base plate 31, the contact spring 34 strives to push the contact bridge 4 and the base plate 31 apart, as a result of which the contact bridge 4 is pressed in the direction of the fixed contacts 2.
- the upper yoke element 50 has a depression 52 on the underside facing the contact bridge 4 .
- the recess 52 can be designed in particular as a channel-like or groove-like recess.
- the contact bridge 4 can protrude at least partially into the recess 52 when the switching device 100 is switched on. Furthermore, as can be seen, for example, in FIG.
- the contact bridge 4 can have a constriction 45, i.e., for example, a bar-shaped area with a reduced width compared to the contact areas of the contact bridge 4, the constriction 45 being arranged at least partially in the depression 52 of the upper yoke element 50 when the switching device 100 is switched on.
- the recess 52 has a width that is greater than a width of the contact bridge 4 at least in the region of constriction 45 is.
- the depression 52 can have a depth that is less than or equal to or essentially equal to a thickness of the contact bridge 4 .
- the contact bridge 4 can move into the depression 52 when the switching device 100 changes from a switched-off state to a switched-on state due to the switching movement of the contact arrangement 200 .
- the upper yoke element 50 can thus, in a switched-on state of the switching device 100, encompass the contact bridge 4 at least partially in the lateral direction 90, in particular in the transverse direction 93.
- the position of the contact spring 34 is also indicated in FIG. 2D.
- the contact bridge 4 as can be seen in particular in FIG. 2E, can have a thickness which is greater than the depth of the recess 52.
- the upper yoke element 50 can therefore only partially encompass the contact bridge 4 in a switched-on state.
- the contact bridge can thus partially protrude from the depression 52 when the switching device 100 is switched on.
- the contact bridge 4 can particularly preferably be spaced apart from the upper yoke element 50 in the switched-on state. As can also be seen in FIG. 2E, this makes it possible for the contact bridge to have no mechanical contact with the upper yoke element 50 when it is switched on. Correspondingly, an air gap can also remain between the upper yoke element 50 and the contact bridge 4 in the switched-on state. By providing such a gap, manufacturing tolerances, for example, can be taken into account. In addition, it can be achieved that a possible burn-off, i.e. a wearing away and uncontrolled Depositing of material of the contacts 1, as can occur, for example, in the formation of switching arcs, can have no undesirable consequences.
- the upper yoke element 50 forms an anti-levitation mechanism, the functioning of which is indicated in connection with FIG.
- the switching device 100 is shown here in a switched-on state, in which an electric current I flows through the contact bridge 4 .
- a levitation force Flev can occur, which pushes the contact bridge 4 away from the stationary contacts. Without the effect described below, only the spring force of the contact spring counteracts the levitation force.
- a magnetic field with a magnetic flux MF is induced in the switching device described here in the upper yoke element 50 when the switching device is switched on when a current flows through the contact bridge 4 .
- the magnetic field lines can concentrate on the upper side of the upper yoke element 50.
- a large thickness of the upper yoke element 50 over the contact bridge 4 can be advantageous.
- the upper yoke element 50 can particularly preferably have a greater thickness than the contact bridge 4 in the vertical direction 91 above the contact bridge 4 .
- the field on the underside facing the contact bridge 4 and through the contact bridge 4 is strongly compressed and generates a reluctance force freely on the contact bridge 4, which counteracts the levitation force and also acts as anti-levitation -force can be denoted.
- a holding effect can thus be achieved by a flux of the magnetic field from the upper yoke element 50 through the contact bridge 4 .
- the contact bridge 4 can also be designed without a constriction and thus have a simple cuboid shape, for example. Furthermore, it can also be possible, as indicated in FIG. 4B, for one or more or all edges of the upper yoke element 50 and/or the contact bridge 4 to be rounded off or bevelled.
- FIG. 5A shows a sectional view of the switching device 100 with the contact arrangement 200
- FIGS. 5B to 5D show different views of parts of the switching device 100 and in particular of the contact arrangement 200.
- FIG. the The following description of the switching device 100 applies equally to all of Figures 5A to 5D.
- FIG. 5A also shows the housing 19 of the switching device 100, while in comparison to FIG. 1 the return spring 10 for returning the magnetic drive 5 to the switched-off state is not shown for the sake of clarity.
- Coil connections 18 for driving the coil 8 are also shown in FIG. 5B.
- the elements shown in FIGS. 5A to 5D correspond to the elements explained in connection with FIG. 1 and with FIGS. 2A to 3.
- the contact arrangement 200 is arranged in the switching chamber 11, has the contact bridge 4, a holding element 30 and a lower yoke element 40 and is fastened to the axle 7. As a result, the contact arrangement 200 can be moved by the magnetic drive described above in order to carry out the switching movements of the switching device 100 .
- the switching device 100 has an upper yoke element 50, as in the exemplary embodiment in FIGS. 2A to 2F.
- the lower yoke member 40 and the upper yoke member 50 may each comprise or be made of iron.
- the yoke elements 40, 50 can each have or be made of pure iron.
- the contact bridge 4 is arranged between the lower yoke element 40 and the upper yoke element 50 .
- the upper yoke member 50 is not part of the contact assembly 200 but is independent of the contact assembly 200 and thus arranged and fixed in the switching chamber 11 independently of the lower yoke element 40, as explained in connection with FIGS. 2A to 2F.
- the holding element 30 is attached to the axle 7 .
- the holding element 30 has an electrically insulating plastic, in particular a plastic described above in the general part, with part of the axis 7 being formed with the material of the holding element 30 .
- the axis 7 has, as can be seen in FIG.
- another fastening method is also possible, for example by means of rivets or screws.
- the holding element 30 has a base plate 31 which is attached to the axle 7 .
- the holding element 30 has clamp elements 32 for the movable mounting of the contact bridge 4 and the lower yoke element 40.
- the holding element 30 can particularly preferably be formed in one piece and have a material as described above in the general part.
- the contact bridge 4 and the lower yoke element 40 are each mounted on the holding element 30 in a displaceable manner.
- the position of lower yoke member 40 relative to upper yoke member 50 may vary depending on the state of switching device 100 .
- an air gap between the lower yoke element 40 and the upper yoke element 50 can thus be variable, in particular when the switching device 100 is in a switched-on state.
- the position of the lower yoke element 40 relative to the upper yoke element 50 can change as a result of a movement of the contact arrangement 200 in the switching chamber 11 .
- the lower yoke element 40 is particularly preferably mounted on the holding element 30 in such a way that the lower yoke element 40 can be displaced along a direction of movement which is parallel to the axis 7 and thus runs along the vertical direction 91 . Furthermore, the contact bridge 4 is also slidably mounted on the holding element along a direction of movement that is parallel to the axis 7 . Thus, the contact bridge 7 and the lower yoke element 40 and the contact bridge 7 and the upper yoke element 50 can also be displaced relative to one another.
- the lower yoke element 40 can rest on the base plate 31 at least in the switched-off state of the switching device 100 indicated in FIGS. 5A to 5C.
- the lower yoke element 40 can have, for example, peripheral grooves on the side facing the base plate 31, into which projections of the base plate 30 can engage.
- the holding element 30 has guide elements 36 and stops 37 for guiding the contact bridge 4 and the lower yoke element 40 .
- the guide elements 36 are designed as guide rails and allow movement of the contact bridge 4 and the lower yoke element 40 along the desired displacement direction, while the mobility of the contact bridge 4 and the lower yoke element 40 in other directions is restricted by the guide members 36.
- the holding element 30 has stops 37 which are arranged on a side of the guide elements 36 opposite the base plate 31 .
- two guide elements and a stop 37 each form a clamp element 32 which forms an opening 38 with the base plate 31 in each case.
- each of the clamp elements 32 encompasses the contact bridge 4.
- the contact bridge 4 can protrude through the openings 38 and can thereby be guided within the openings 38 of the clamp elements 32.
- the lower yoke element 40 is guided between the clamp elements 32 .
- the lower yoke element 40 can also be designed in such a way that it protrudes through the openings 38 and is guided within the openings 38 and is thus encompassed by the clamp elements 32 .
- the holding element 30 can also be designed in such a way that the stops 37 protrude into an intermediate space between a fixed contact 2 and the upper yoke element 50 when the switching device 100 is switched on, as can be seen in FIG. 5B. As a result, at least partial electrical insulation of the upper yoke element 50 from the stationary contacts 2 can be achieved, for example.
- the contact arrangement 200 also has a contact spring 34 which is arranged on the underside of the contact bridge 4 facing the lower yoke element 40 .
- the contact spring 34 is arranged between the contact bridge 4 and the lower yoke element 40 in comparison to the embodiment of Figures 2A to 2F.
- the contact spring 34 is designed as a compression spring. As described above, a contact pressure of the contact bridge 4 on the stationary contacts 2 can be increased by the contact spring 34 in conjunction with an overtravel. Due to the fact that the contact spring 34 is arranged between the contact bridge 4 and the lower yoke element 40, the contact spring 40 strives to push the contact bridge 4 and the lower yoke element 40 apart. The contact spring 34 thus generates a spring force which counteracts an approach of the lower yoke element 40 to the contact bridge 4 . As shown, the contact spring 34 can be supported in particular directly on the underside of the contact bridge 4 and/or directly on the lower yoke element 40 . The lower yoke element 40 has a recess 41 into which the contact spring 34 protrudes and through which the position of the contact spring 34 can be fixed.
- the upper yoke element 50 has a depression 52 on the underside facing the contact bridge 4 .
- the depression 52 can be designed in particular as a channel-like or groove-like depression.
- the contact bridge 4 can protrude at least partially into the recess 52 when the switching device 100 is switched on.
- the contact bridge 4 as can be seen in FIG a web-shaped area, for example, with a reduced width compared to the contact areas of the contact bridge 4, wherein the constriction 45 is at least partially arranged in the depression 52 of the upper yoke element 50 in an switched-on state of the switching device 100 .
- the geometric configuration of the contact bridge 4 and the upper yoke element 50 can be as described in connection with FIGS. 2A to 4B.
- the lower yoke element 40 which is plate-shaped in the exemplary embodiment shown, can have a depression corresponding to the depression 52, while the upper yoke element 50 can have a flat underside.
- both yoke elements 40, 50 each have a depression through which each of the yoke elements 40, 50 can partially encompass the contact bridge 4 from below or from above in a corresponding position relative to the contact bridge 4.
- the contact arrangement 200 and in particular the lower yoke element 40 and the upper yoke element 50 form a further anti-levitation mechanism, the functioning of which is explained in connection with Figures 6A to 6D using sections of the switching device 100 in
- the switching device 100 is shown here in a switched-on state, in which an electric current I flows through the contact bridge 4, as indicated in FIGS. 6A and 6C.
- the switching device 100 In the switched-off state of the switching device 100, the moving parts of the switching device 100 are stored in the lower rest position, as shown in FIG. 5A, for example.
- the electrical contact between the fixed contacts 2 and the contact bridge 4 is separated in this state.
- the contact spring 34 prestresses the contact bridge 4 and the lower yoke element 40 and holds them in position in the cage formed by the base plate 31 and the clamp elements 32 of the holding element 30 .
- a magnetic flux MF is induced in the yoke elements 40, 50 by the electric current I flowing through the contact bridge 4.
- the magnetization causes a reluctance force Frei, ie an attractive force, between the yoke elements 40, 50, which is directed against the spring force Fs of the contact spring 34.
- the acting reluctance force The greater the electric current I flowing through the contact bridge 4, the stronger the free force, ie the force of attraction.
- the contact spring 34 strives to push the lower yoke element 40 away from the contact bridge 4 and thus also from the upper yoke element 50, the spring force Fs can be greater than the reluctance force Frei between the yoke elements 40 if the electrical currents I are sufficiently small.
- the first distance LI can particularly preferably be more than 1 mm and in particular several millimeters, for example 3 mm or even 5 mm.
- a current threshold for the electrical current I can be set by suitably selecting the spring constants of the contact spring 34, the geometric design and size of the yoke elements 40, 50 and the first distance LI, up to which the state shown in FIGS. 6A and 6B is maintained and the air gap L remains open as shown.
- the current threshold is preferably above the nominal current and can particularly preferably also be above smaller short-circuit currents.
- the current threshold can be several kiloamperes, about 5 kA. In the low short-circuit current range below the current threshold, the levitation force Flev, which pushes the contact bridge 4 away from the fixed contacts 2, is low, so that the contact spring 34 alone can apply the force to hold the contact bridge 4 on the fixed contacts 2.
- the reluctance force Frei also increases proportionally with the electrical current I and exceeds the spring force Fs.
- the lower yoke element 40 moves upwards, ie towards the upper yoke element 50 .
- the reluctance force Frei grows exponentially over the spring force Fs.
- the contact spring 34 is further compressed, preferably until the lower yoke element 40 rests on the underside of the contact bridge 4 or the underside of the upper yoke element 50 .
- the air gap L corresponds to a smaller second distance L2 between the yoke elements 40, 50, which in this case can be minimal and even equal to 0 or approximately equal to 0.
- the pressing force is now at its maximum and in particular so great that the reluctance force Frei continues to exceed the levitation force Flev and the contact bridge 4 can continue to be pressed against the stationary contacts 2 .
- a maximum short-circuit current which can be in the range of 16 kA or more, for example, are the yoke elements 40, 50 saturated by the magnetic flux MF and the levitation force Flev can exceed the reluctance force Frei, which would cause the contact bridge 4 to lift off the fixed contacts 2 .
- the air gap L is thus variable, as described, depending on the electrical current I flowing through the contact bridge 4, as a result of which the holding force is also variable. It can be achieved that the additional holding force through the yoke elements 40, 50 only in In the event of a short circuit above the current threshold, "switches on", which means that the switching device 100 can carry larger short-circuit currents compared to known solutions.
- switches on which means that the switching device 100 can carry larger short-circuit currents compared to known solutions.
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Abstract
Description
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JP2023575522A JP2024520772A (ja) | 2021-06-08 | 2022-06-03 | スイッチング装置 |
EP22734526.1A EP4352771A1 (de) | 2021-06-08 | 2022-06-03 | Schaltvorrichtung |
CN202280041328.0A CN117461107A (zh) | 2021-06-08 | 2022-06-03 | 开关装置 |
US18/529,913 US20240105409A1 (en) | 2021-06-08 | 2023-12-05 | Switching device |
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DE102021114675 | 2021-06-08 | ||
DE102021114675.5 | 2021-06-08 | ||
DE102022104711.3A DE102022104711A1 (de) | 2022-02-28 | 2022-02-28 | Schaltvorrichtung |
DE102022104711.3 | 2022-02-28 |
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US18/529,913 Continuation-In-Part US20240105409A1 (en) | 2021-06-08 | 2023-12-05 | Switching device |
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WO2022258525A1 true WO2022258525A1 (de) | 2022-12-15 |
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JP2014157830A (ja) * | 2014-04-21 | 2014-08-28 | Panasonic Corp | 接点装置 |
DE102016206130A1 (de) | 2015-04-13 | 2016-10-13 | Panasonic Intellectual Property Management Co., Ltd. | Kontaktvorrichtung und elektromagnetisches Relais |
EP2608235B1 (de) | 2010-03-25 | 2017-12-20 | Panasonic Intellectual Property Management Co., Ltd. | Kontaktvorrichtung |
CN209000835U (zh) | 2018-11-09 | 2019-06-18 | 厦门宏发电力电器有限公司 | 抗短路电流的直流继电器 |
US20200035433A1 (en) * | 2018-07-24 | 2020-01-30 | Denso Corporation | Contact device and electromagnetic relay |
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- 2022-06-03 WO PCT/EP2022/065211 patent/WO2022258525A1/de active Application Filing
- 2022-06-03 EP EP22734526.1A patent/EP4352771A1/de active Pending
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2608235B1 (de) | 2010-03-25 | 2017-12-20 | Panasonic Intellectual Property Management Co., Ltd. | Kontaktvorrichtung |
JP2014157830A (ja) * | 2014-04-21 | 2014-08-28 | Panasonic Corp | 接点装置 |
DE102016206130A1 (de) | 2015-04-13 | 2016-10-13 | Panasonic Intellectual Property Management Co., Ltd. | Kontaktvorrichtung und elektromagnetisches Relais |
US20200035433A1 (en) * | 2018-07-24 | 2020-01-30 | Denso Corporation | Contact device and electromagnetic relay |
CN209000835U (zh) | 2018-11-09 | 2019-06-18 | 厦门宏发电力电器有限公司 | 抗短路电流的直流继电器 |
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US20240105409A1 (en) | 2024-03-28 |
JP2024520772A (ja) | 2024-05-24 |
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