A control circuit for a magnetic latching relay and a magnetic latching relay device

Abstract

The present invention discloses a control circuit for a magnetic latching relay and a magnetic latching relay device, belonging to the field of relay technology. In the control circuit provided by the present invention, by bidirectionally discharging the electromagnetic coil, the energy storage capacitor will store the energy required for the reverse discharge of the coil when the coil is discharged in the forward direction. When the power is off, the energy storage capacitor discharges the coil in the reverse direction through the normally closed switch, i.e., the pop-up control switch, thereby switching the switch state of the magnetic latching relay. Since the reverse discharge of the control circuit is performed when the power is off, the problem that the magnetic latching relay cannot return to the initial state when the power is off can be solved. In addition, in the magnetic latching relay device provided by the present invention, the magnetic latching relay uses a permanent magnet to provide the attraction required to maintain the moving iron core in the attracted position. It has the advantage that the coil does not need to be continuously energized when the relay is working, and can solve the problems of excessive noise and vibration, excessive coil power, and severe coil heating during the operation of the electromagnetic relay.

Description

Technical Field

[0001] The present invention belongs to the technical field of relays, and more particularly, relates to a control circuit of a magnetic latching relay and a magnetic latching relay device. Background Art

[0002] An electromagnetic relay is an electrical control device that controls the operation of large currents between moving and static contacts by driving a small current in the coil. It can serve as both a control component and a protection component, and can realize functions such as remote control, safety protection, adjustment and detection, and circuit conversion in the circuit. Therefore, it has extremely wide applications in electronic communications, household and industrial appliances, power system relay protection, aerospace and other fields.

[0003] In existing technology, electromagnetic relays typically include components such as a coil, an iron core, a moving contact, a stationary contact, and a spring. When current flows through the coil, it generates a magnetic field within the coil, exerting an attractive force on the iron core, causing the moving contact to contact the stationary contact and closing the circuit. When the current in the coil disappears, the iron core, acting under the action of the spring, returns to its initial position, disengaging the moving and stationary contacts and disconnecting the circuit. However, these electromagnetic relays require continuous power to the coil to maintain reliable contact between the moving and stationary contacts. This can lead to excessive operating noise and vibration, excessive coil power, and severe coil heating.

[0004] The magnetic latching relay, a new type of relay developed in recent years, is also a type of automatic switch. Like electromagnetic relays, it automatically connects and disconnects circuits. However, the normally closed or normally open state of a magnetic latching relay relies entirely on the action of a permanent magnet, and its switching state is triggered by a pulsed electrical signal of a certain width. The open and closed states of a magnetic latching relay's contacts are normally maintained by the magnetic force generated between the permanent magnet and the yoke. When the relay contacts need to be opened or closed, the coil is energized with a positive or negative DC pulse voltage, and the relay switches between open and closed states instantly. Normally, when the contacts are in the latched state, the coil does not need to be energized; the magnetic force between the permanent magnet and the yoke alone maintains the relay's state. While this magnetic latching relay solves the problem of electromagnetic relays requiring continuous coil power during operation, its reset operation, like the switching control during normal operation, requires an external driver power supply. Under adverse operating conditions such as sudden power outages, these magnetic latching relays cannot return to their initial switching state. Summary of the Invention

[0005] In response to the above defects or improvement needs of the prior art, the present invention provides a control circuit and a magnetic latching relay device for solving the technical problem that the prior art cannot return the magnetic latching relay to the initial switching state in the event of a power outage.

[0006] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a control circuit of a magnetic latching relay, comprising: a rectifier bridge module, a DC switch, an energy storage capacitor, a discharge circuit and a controller;

[0007] The rectifier bridge module is connected to the energy storage capacitor through a DC switch to convert the input AC power into DC power.

[0008] The discharge circuit includes a first branch and a second branch connected in parallel, and both branches are connected in parallel at both ends of the energy storage capacitor;

[0009] The first branch and the second branch each include: a pull-in control switch, a pop-up control switch, and a current-limiting resistor connected in series; the end of the pull-in control switch connected to the pop-up control switch is denoted as end B, and the other end is denoted as end C; the end of the current-limiting resistor connected to the pop-up control switch is denoted as end D, and the other end is denoted as end E;

[0010] In the first branch, the C terminal of the pull-in control switch is connected to the positive electrode of the energy storage capacitor, and the E terminal of the current limiting resistor is connected to the negative electrode of the energy storage capacitor; in the second branch, the C terminal of the pull-in control switch is connected to the negative electrode of the energy storage capacitor, and the E terminal of the current limiting resistor is connected to the positive electrode of the energy storage capacitor;

[0011] The B terminals of the pull-in control switches in the first branch and the second branch serve as the load output terminals of the control circuit and are used to connect to the electromagnetic coils of the magnetic latching relays.

[0012] The DC switch and the pull-in control switch are both normally open switches, and the pop-up control switch is a normally closed switch;

[0013] The controller is used to control the forward discharge and reverse discharge of the electromagnetic coil of the magnetic latching relay by controlling the power-on state of the DC switch and each pop-up control switch and each pull-in control switch, thereby controlling the switching state of the magnetic latching relay;

[0014] When the magnetic latching relay is switched from an initial switching state to a first switching state opposite to the initial switching state, the controller is configured to energize the DC switch and each pop-up control switch to close the DC switch and open each pop-up control switch, thereby charging the energy storage capacitor; after charging is completed, energize each pull-in control switch to close each pull-in control switch, thereby forward-discharging the electromagnetic coil in the magnetic latching relay; and when the switching state of the magnetic latching relay changes during the forward discharge of the electromagnetic coil, de-energizing each pull-in control switch is stopped;

[0015] When the magnetic latching relay is switched from the first switching state back to the initial switching state, the controller is used to control each pop-up control switch and each pull-in control switch to be in a power-off state, so that each pop-up control switch is closed and each pull-in control switch is disconnected, thereby reversely discharging the electromagnetic coil in the magnetic latching relay.

[0016] Further preferably, the DC switch is a fully controlled switch device.

[0017] In a second aspect, the present invention provides a magnetic latching relay device, comprising: a magnetic latching relay and the control circuit provided in the first aspect of the present invention.

[0018] Further preferably, the magnetic latching relay comprises: a high-voltage moving contact, a high-voltage static contact, a moving iron core, a linkage component, a magnetic conductive component, an electromagnetic coil and a permanent magnet;

[0019] The high-voltage moving contact and the moving iron core are fixedly connected through a linkage component. The moving iron core is set in a position that matches the magnetic conductive component. When excited by the electromagnetic coil, it moves, performing an attraction or release action with the magnetic conductive component, thereby driving the linkage component to move, so that the high-voltage moving contact and the high-voltage static contact come into contact or separate.

[0020] The permanent magnet is used to provide a constant attractive force to the moving iron core and keep it in the attracted position after the moving iron core completes the attraction action.

[0021] Further preferably, the magnetic latching relay further comprises: a fixing platform, a spring fixing piece and a reaction spring;

[0022] The high-voltage static contact, the fixing platform and the magnetic conductive component are fixed on the back plate in sequence from top to bottom;

[0023] The moving iron core is arranged at a position matching the magnetic conductive component, and moves up and down along the axis within the aperture of the electromagnetic coil under the excitation of the electromagnetic coil;

[0024] The spring fixing piece is fixed to the end of the moving iron core close to the high-voltage moving contact; one end of the reaction spring is fixed to the spring fixing piece, and the other end is fixed to the magnetic conductive component, which is used to stretch or compress with the movement of the moving iron core;

[0025] The fixed platform is used to limit the moving iron core;

[0026] The permanent magnet is placed inside the magnetic conductive component and below the electromagnetic coil and the moving iron core;

[0027] When the electromagnetic coil is discharged in the forward direction, it generates a forward magnetic field, and the moving iron core moves downward along the axis, performing an attraction action with the magnetic conductive component and being held in the attracted position by the attraction of the permanent magnet, and the reaction spring is in a compressed state;

[0028] When the electromagnetic coil discharges in the reverse direction, it generates a reverse magnetic field to offset the magnetic field generated by the permanent magnet. The moving iron core moves upward under the action of the reaction spring, executing the release action from the magnetic conductive component.

[0029] Further preferably, the permanent magnet is located directly below the moving iron core, and its area is the same as the area of ​​the end of the moving iron core.

[0030] Further preferably, the high-voltage moving contact is cylindrical in shape, and the high-voltage static contact is square plate-shaped.

[0031] Further preferably, the linkage component is a linkage rod.

[0032] Further preferably, the magnetic conductive component is a magnetic yoke.

[0033] Further preferably, the moving iron core and the magnetic yoke are both made of laminated silicon steel sheets and are prismatic in shape.

[0034] Further preferably, the magnetic latching relay further comprises: a shock-absorbing plate located between the fixing platform and the spring fixing plate, for providing a buffer when the moving iron core bounces and hits the fixing platform.

[0035] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

[0036] 1. The present invention provides a control circuit and a magnetic latching relay device. By bidirectionally discharging the electromagnetic coil, an energy storage capacitor stores the energy required for reverse discharge of the coil when the coil is discharged in the forward direction. When the power is off, the energy storage capacitor discharges the coil in the reverse direction through a normally closed switch, i.e., a pop-up control switch, thereby switching the switch state of the magnetic latching relay. Since the reverse discharge of the control circuit is performed when the power is off, the problem that the magnetic latching relay cannot return to its initial state when the power is off can be solved.

[0037] 2. In the magnetic latching relay device provided by the present invention, the magnetic latching relay uses a permanent magnet to provide the attractive force required to maintain the moving iron core in the attracted position. Compared with the common electromagnetic relay without permanent magnets, it has the advantage that the coil does not need to be continuously energized when the relay is working, and can solve the problems of excessive noise and vibration, excessive coil power, and severe coil heating during the operation of the electromagnetic relay.

[0038] 3. Furthermore, in the magnetic latching relay device provided by the present invention, the permanent magnet in the magnetic latching relay is located directly below the moving iron core, and its area is the same as the end area of ​​the moving iron core, so that the suction force provided by the permanent magnet is the largest when the moving iron core moves to the lowest position, which can reduce the required volume of the permanent magnet; at the same time, due to the symmetry of the structure, when the reverse current flows through the coil, the reverse magnetic field generated has the best effect in offsetting the magnetic field of the permanent magnet.

[0039] 4. Furthermore, in the magnetic latching relay device provided by the present invention, the high-voltage moving contact in the magnetic latching relay is cylindrical in shape, and the high-voltage static contact is square plate-shaped, which can reduce the contact resistance between the moving and static contacts, thereby reducing the heating power at the contacts, avoiding excessive energy loss and even contact welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of a control circuit of a magnetic latching relay provided in an embodiment of the present invention;

[0041] Figure 2 A schematic structural diagram of a magnetic latching relay provided in an embodiment of the present invention;

[0042] Figure 3 A schematic structural diagram of a high-voltage moving contact and a high-voltage static contact in a magnetic latching relay provided in an embodiment of the present invention.

[0043] Figure numerals: pressure spring at the top of the moving contact -1, high-voltage moving contact -2, high-voltage static contact -3, epoxy backplate -4, connecting rod -5, fixing platform -6, rubber shock-absorbing plate -7, spring fixing plate -8, reaction spring -9, iron core -10, coil skeleton -11, electromagnetic coil -12, magnetic yoke -13, permanent magnet -14, rectifier bridge module -A1, DC switch -A2, energy storage capacitor -A3, pull-in control switch -A4, pop-up control switch -A5, current limiting resistor -A6, two ends of the pull-in control switch -B and C, two ends of the current limiting resistor -D and E. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0045] In order to achieve the above objectives, firstly, Figure 1 As shown, the present invention provides a control circuit of a magnetic latching relay, comprising: a rectifier bridge module A1, a DC switch A2, an energy storage capacitor A3, a discharge circuit and a controller;

[0046] The rectifier bridge module A1 is connected to the energy storage capacitor A3 via a DC switch A2 to convert the input AC power into DC power. The DC switch A2 is a normally open switch, open in normal operation and closed when powered on. The DC switch A2 can be a fully controlled switch device such as an IGBT or MOSFET, preferably an IGBT. The DC switch A2 is used to control the on / off of the DC high voltage output of the rectifier bridge module A1.

[0047] The discharge circuit includes a first branch and a second branch connected in parallel, and both branches are connected in parallel across the energy storage capacitor A3;

[0048] Both the first branch and the second branch include: a pull-in control switch A4, a pop-up control switch A5 and a current-limiting resistor A6 connected in series; the end of the pull-in control switch connected to the pop-up control switch is recorded as end B, and the other end is recorded as end C; the end of the current-limiting resistor connected to the pop-up control switch is recorded as end D, and the other end is recorded as end E; wherein, the pull-in control switch is a normally open switch, which is disconnected in normal state and closed after power is applied; the pop-up control switch is a normally closed switch, which is closed in normal state and disconnected after power is applied; the current-limiting resistor is used to limit the current flowing through the electromagnetic coil when the electromagnetic coil is reversely discharged, and to achieve over-damped discharge; in an optional implementation manner, both the pull-in control switch and the pop-up control switch use small relays, wherein the pull-in control switch uses normally open contacts, and the pop-up control switch uses normally closed contacts.

[0049] In the first branch, the C terminal of the pull-in control switch is connected to the positive electrode of the energy storage capacitor, and the E terminal of the current limiting resistor is connected to the negative electrode of the energy storage capacitor; in the second branch, the C terminal of the pull-in control switch is connected to the negative electrode of the energy storage capacitor, and the E terminal of the current limiting resistor is connected to the positive electrode of the energy storage capacitor;

[0050] The B terminals of the pull-in control switches in the first branch and the second branch serve as the load output terminals of the control circuit and are used to connect to the electromagnetic coils of the magnetic latching relays.

[0051] The controller is used to control the forward and reverse discharge of the electromagnetic coil of the magnetic latching relay by controlling the power-on state of the DC switch and each pop-up control switch and each pull-in control switch, thereby controlling the switching state of the magnetic latching relay. When the electromagnetic coil is discharged in the forward direction, the magnetic latching relay switches from the initial switching state to the current switching state; when the electromagnetic coil is discharged in the reverse direction, the magnetic latching relay switches from the current switching state back to the initial switching state.

[0052] When the magnetic latching relay is switched from an initial switching state to a first switching state opposite to the initial switching state, the controller is configured to energize the DC switch and each pop-up control switch to close the DC switch and open each pop-up control switch, thereby charging the energy storage capacitor; after charging is completed, energize each pull-in control switch to close each pull-in control switch, thereby forward-discharging the electromagnetic coil in the magnetic latching relay; and during the forward discharge process, when the switching state of the magnetic latching relay changes, de-energizing each pull-in control switch;

[0053] When the magnetic latching relay is switched from the first switching state back to the initial switching state, the controller is used to control each pop-up control switch and each pull-in control switch to be in a power-off state, so that each pop-up control switch is closed and each pull-in control switch is disconnected, thereby reversely discharging the electromagnetic coil in the magnetic latching relay.

[0054] In an optional implementation manner, the energy storage capacitor is an electrolytic capacitor, and the capacitance is determined according to the parameters of the electromagnetic coil.

[0055] In a second aspect, the present invention provides a magnetic latching relay device, comprising: a magnetic latching relay and the control circuit provided in the first aspect of the present invention.

[0056] In an optional embodiment, the magnetic latching relay includes: a high-voltage movable contact, a high-voltage static contact, a movable iron core, a linkage component, a magnetic conductive component, an electromagnetic coil, and a permanent magnet;

[0057] The high-voltage moving contact and the moving iron core are fixedly connected through a linkage component. The moving iron core is set in a position that matches the magnetic conductive component. When excited by the electromagnetic coil, it moves, performing an attraction or release action with the magnetic conductive component, thereby driving the linkage component to move, so that the high-voltage moving contact and the high-voltage static contact come into contact or separate.

[0058] The permanent magnet is used to provide a constant attractive force to the moving iron core and keep it in the attracted position after the moving iron core completes the attraction action.

[0059] In an optional embodiment, the magnetic latching relay further includes: a fixing platform, a spring fixing piece and a reaction spring;

[0060] The high-voltage static contact, the fixing platform and the magnetic conductive component are fixed on the back plate in sequence from top to bottom;

[0061] The moving iron core is arranged at a position matching the magnetic conductive component, and moves up and down along the axis within the aperture of the electromagnetic coil under the excitation of the electromagnetic coil;

[0062] The spring fixing piece is fixed to the end of the moving iron core close to the high-voltage moving contact; one end of the reaction spring is fixed to the spring fixing piece, and the other end is fixed to the magnetic conductive component, which is used to stretch or compress with the movement of the moving iron core;

[0063] The fixed platform is used to limit the moving iron core;

[0064] The permanent magnet is placed inside the magnetic conductive component and below the electromagnetic coil and the moving iron core;

[0065] When the electromagnetic coil is discharged in the forward direction, it generates a forward magnetic field, and the moving iron core moves downward along the axis, performing an attraction action with the magnetic conductive component and being held in the attracted position by the attraction of the permanent magnet, and the reaction spring is in a compressed state;

[0066] When the electromagnetic coil discharges in the reverse direction, it generates a reverse magnetic field to offset the magnetic field generated by the permanent magnet. The moving iron core moves upward under the action of the reaction spring, executing the release action from the magnetic conductive component.

[0067] In an optional embodiment, the permanent magnet is located directly below the moving iron core, and its area is the same as the area of ​​the end of the moving iron core.

[0068] In an optional embodiment, the high-voltage moving contact is cylindrical in shape, and the high-voltage static contact is square plate-shaped, so as to reduce the contact resistance between the moving and static contacts, thereby reducing the heating power at the contacts, avoiding excessive energy loss and even contact welding.

[0069] In an optional embodiment, the linkage component is a linkage rod.

[0070] In an optional embodiment, the magnetic conductive component is a magnetic yoke.

[0071] In an optional embodiment, the moving iron core and the magnetic yoke are both made of laminated silicon steel sheets and are prismatic in shape.

[0072] In an optional embodiment, the magnetic latching relay further includes: a shock-absorbing plate located between the fixing platform and the spring fixing plate, which provides a buffer when the moving iron core bounces and hits the fixing platform.

[0073] Specifically, if Figure 2 The figure shows an implementation method of a magnetic latching relay, including: a pressure spring 1 at the top of the moving contact, a high-voltage moving contact 2, a high-voltage static contact 3, an epoxy backplate 4, a connecting rod 5, a fixing platform 6, a rubber shock-absorbing plate 7, a spring fixing plate 8, a reaction spring 9, a moving iron core 10, a coil skeleton 11, an electromagnetic coil 12, a magnetic yoke 13 and a permanent magnet 14.

[0074] Among them, the high-voltage static contact 3, fixed platform 6, rubber shock-absorbing plate 7, spring fixing plate 8, and yoke 13 are fixed on the epoxy backing plate 4 from top to bottom, the coil skeleton 11 is placed inside the yoke 13, and the electromagnetic coil 12 is wound on the coil skeleton 11; the moving iron core 10 is placed in the electromagnetic coil aperture; the high-voltage moving contact 3 and the moving iron core 10 are fixedly connected by the connecting rod 5; the moving iron core 10 moves along the axis within the electromagnetic coil aperture under the excitation of the electromagnetic coil, thereby driving the connecting rod 5 to move, so that the high-voltage moving contact 2 and the high-voltage static contact 3 contact or separate; the high-voltage moving contact 2 and the high-voltage static contact 3 are used to realize the high-voltage side breaking function;

[0075] The spring fixing piece 8 is fixed to the end of the moving iron core near the high-voltage moving contact. The reaction spring 9 is placed between the spring fixing piece 8 and the magnetic yoke 13, with one end fixed to the spring fixing piece 8 and the other end fixed to the magnetic yoke 13. It is stretched or compressed as the moving iron core 10 moves. When the moving iron core 10 completes the attraction action with the magnetic yoke 13, the reaction spring 9 is in a compressed state, used to provide a reaction force for the moving iron core 10 to bounce up. When the moving iron core 10 completes the release action with the magnetic yoke 13, the reaction spring 9 is in a stretched state, used to provide contact pressure between the high-voltage moving contact 2 and the high-voltage static contact 3, so that the high-voltage moving contact 2 remains stable during operation.

[0076] The permanent magnet 14 is placed inside the yoke 13 and below the electromagnetic coil 12 and the moving iron core 10 , and is used to provide a constant attraction force to the moving iron core 10 after the moving iron core 10 completes the attraction action, thereby ensuring that the moving iron core 10 remains in the attracted position.

[0077] The yoke 13 is used to conduct magnetism and generate electromagnetic attraction, and the raised portion at the upper end thereof is used to limit the position of the reaction spring 9, thereby ensuring that the reaction spring 9 will not deviate or pop out during movement.

[0078] In this embodiment, if Figure 3 As shown, the high-voltage moving contact 2 and the high-voltage static contact 3 are both made of a good conductive alloy and are silver-plated on the surface. The high-voltage static contact 3 is cylindrical in shape, and the high-voltage moving contact 2 is in the shape of a square plate. The epoxy back plate 4, the connecting rod 5, and the fixing platform 6 are all made of insulating materials. The coil skeleton 11 is made using 3D printing technology and the material is common 3D printing material. The moving iron core 10 and the yoke 13 are both made of laminated silicon steel sheets and are prismatic in shape. The material of the permanent magnet 14 is a common permanent magnet such as neodymium iron boron, and its area is the same as the bottom area of ​​the moving iron core. The permanent magnet 14 is placed directly below the moving iron core 10, and the upper surface height is lower than the lower surface height of the coil skeleton 11.

[0079] Taking the above-mentioned magnetic latching relay to complete the switch state switching as an example, the working steps of the magnetic latching relay control circuit are introduced:

[0080] When the magnetic latching relay is switched from the initial switching state to the first switching state opposite to the initial switching state, the controller in the control circuit performs the following operations:

[0081] S1. Power on each pop-up control switch in the control circuit. Since the pop-up control switch is a normally closed contact, it will be disconnected after power is turned on.

[0082] S2. Provides a pulse control signal to the DC switch to close it. At this time, the rectifier bridge module outputs DC high voltage and charges the energy storage capacitor.

[0083] S3. Power on each pull-in control switch to close it. At this time, the DC high voltage output by the rectifier bridge module will be directly applied to both ends of the electromagnetic coil. A positive current will flow through the electromagnetic coil, generating a magnetic field inside the coil. The magnetic lines of force will close through the iron core and the magnetic yoke, and the moving iron core will be attracted downward to complete the pull-in action.

[0084] S4. Disconnect all the pull-in control switches. At this time, the moving iron core will be attracted by the permanent magnet below and maintained in the pull-in position, and the electromagnetic coil does not need to be continuously energized.

[0085] When the magnetic latching relay is switched from the first switching state back to the initial switching state, the controller in the control circuit performs the following operations:

[0086] S5. Disconnect the DC switch. At this time, the energy storage capacitor stores the energy required for the subsequent reverse discharge of the coil.

[0087] S6. Disconnect the power supply to each pop-up control switch. Since the pop-up control switch is a normally closed contact, it will return to the closed state after power failure. At this time, the energy storage capacitor discharges the electromagnetic coil, and a reverse current will flow through the electromagnetic coil. A reverse magnetic field will be generated inside the coil. This magnetic field will offset the magnetic field generated by the permanent magnet, thereby weakening the attraction of the permanent magnet to the iron core. Under the action of the reaction spring, the moving iron core will complete the pop-up action.

[0088] When the magnetic latching relay completes the attraction action, the DC high voltage output by the rectifier bridge module directly discharges to the electromagnetic coil. Therefore, the amplitude of the forward current flowing through the electromagnetic coil is high, and the magnetic field generated is also strong, so the moving iron core will quickly complete the attraction action.

[0089] When the latching relay completes its spring action, the reverse current flowing through the electromagnetic coil is minimal due to the presence of the current-limiting resistor. This is because the required reverse magnetic field only serves to offset the magnetic field of the permanent magnet; an excessively strong reverse magnetic field could potentially cause permanent demagnetization of the permanent magnet. The current-limiting resistor also provides overdamped discharge, preventing coil current oscillation.

[0090] It should be noted that the above-mentioned magnetic latching relay is only one way of realizing the magnetic latching relay, and is not the only way. All existing magnetic latching relays can be applied to the control circuit provided by the present invention, which will not be described in detail here.

[0091] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control circuit for a magnetic latching relay, characterized in that: include: Rectifier bridge module, DC switch, energy storage capacitor, discharge circuit and controller; The rectifier bridge module is connected to the energy storage capacitor through a DC switch to convert the input AC power into DC power. The discharge circuit includes a first branch and a second branch connected in parallel, and both branches are connected in parallel at both ends of the energy storage capacitor; the first branch and the second branch each include: a pull-in control switch, a pop-up control switch, and a current-limiting resistor connected in series; the end of the pull-in control switch connected to the pop-up control switch is denoted as end B, and the other end is denoted as end C; the end of the current-limiting resistor connected to the pop-up control switch is denoted as end D, and the other end is denoted as end E; in the first branch, end C of the pull-in control switch is connected to the positive electrode of the energy storage capacitor, and end E of the current-limiting resistor is connected to the negative electrode of the energy storage capacitor; in the second branch, end C of the pull-in control switch is connected to the negative electrode of the energy storage capacitor, and end E of the current-limiting resistor is connected to the positive electrode of the energy storage capacitor; The B terminals of the pull-in control switches in the first branch and the second branch serve as the load output terminals of the control circuit and are used to connect to the electromagnetic coils of the magnetic latching relays. The DC switch and the pull-in control switch are both normally open switches, and the pop-up control switch is a normally closed switch; The controller is used to control the forward discharge and reverse discharge of the electromagnetic coil of the magnetic latching relay by controlling the power-on state of the DC switch and each pop-up control switch and each pull-in control switch, thereby controlling the switching state of the magnetic latching relay; When the magnetic latching relay is switched from an initial switching state to a first switching state opposite to the initial switching state, the controller is configured to energize the DC switch and each pop-up control switch to close the DC switch and open each pop-up control switch, thereby charging the energy storage capacitor; after charging is completed, energize each pull-in control switch to close each pull-in control switch, thereby forward-discharging the electromagnetic coil; and during the forward-discharging process, when the switching state of the magnetic latching relay changes, de-energizing each pull-in control switch; When the magnetic latching relay is switched from the first switching state back to the initial switching state, the controller is used to control each pop-up control switch and each pull-in control switch to be in a power-off state, so that each pop-up control switch is closed and each pull-in control switch is disconnected, thereby reversely discharging the electromagnetic coil.

2. The control circuit according to claim 1, wherein: The DC switch is a fully controlled switch device.

3. A magnetic latching relay device, characterized in that: include: A magnetic latching relay and a control circuit as claimed in claim 1 or 2.

4. The magnetic latching relay device according to claim 3, wherein: The magnetic latching relay comprises: a high-voltage moving contact, a high-voltage static contact, a moving iron core, a linkage component, a magnetic conductive component, an electromagnetic coil and a permanent magnet; The high-voltage movable contact is fixedly connected to the movable iron core via the linkage component; the movable iron core is arranged at a position cooperating with the magnetic conductive component, and moves under the excitation of the electromagnetic coil, performing an attraction or release action with the magnetic conductive component, thereby driving the linkage component to move, so that the high-voltage movable contact contacts or separates from the high-voltage static contact; The permanent magnet is used to provide a constant attraction force for the moving iron core and keep the moving iron core in the attracted position after the moving iron core completes the attraction action.

5. The magnetic latching relay device according to claim 4, characterized in that: The magnetic latching relay further comprises: a fixing platform, a spring fixing piece and a reaction spring; The high-voltage static contact, the fixing platform and the magnetic conductive component are fixed on the back plate in sequence from top to bottom; The moving iron core is arranged at a position cooperating with the magnetic conductive component, and moves up and down along the axis within the aperture of the electromagnetic coil under the excitation of the electromagnetic coil; The spring fixing piece is fixed to one end of the moving iron core close to the high-voltage moving contact; one end of the reaction spring is fixed to the spring fixing piece, and the other end is fixed to the magnetic conductive component, and is used for stretching or compressing with the movement of the moving iron core; The fixing platform is used to limit the moving iron core; The permanent magnet is placed inside the magnetic conductive component and below the electromagnetic coil and the moving iron core; When the electromagnetic coil is discharged in the forward direction, the electromagnetic coil generates a forward magnetic field, the moving iron core moves downward along the axis, performs an attraction action with the magnetic conductive component, and is maintained in the attracted position under the attraction of the permanent magnet, and the reaction spring is in a compressed state; When the electromagnetic coil discharges in the reverse direction, it generates a reverse magnetic field to offset the magnetic field generated by the permanent magnet. The moving iron core moves upward under the action of the reaction spring to release the magnetic conductive component.

6. The magnetic latching relay device according to claim 4, wherein: The permanent magnet is located directly below the moving iron core, and its area is the same as that of the end portion of the moving iron core.

7. The magnetic latching relay device according to claim 4, wherein: The high-voltage moving contact is cylindrical in shape, and the high-voltage static contact is square plate-shaped.

8. The magnetic latching relay device according to claim 4, wherein: The linkage component is a linkage rod.

9. The magnetic latching relay device according to claim 4, wherein: The magnetic conductive component is a magnetic yoke.

10. The magnetic latching relay device according to claim 5, wherein: Also includes: The shock-absorbing plate located between the fixing platform and the spring fixing plate provides a buffer when the moving iron core bounces and hits the fixing platform.

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