CN210467709U

CN210467709U - Magnetic latching relay control circuit and driving system

Info

Publication number: CN210467709U
Application number: CN201921981938.0U
Authority: CN
Inventors: 赵念军; 黄飚; 董介明; 汪龙; 刘强; 贺喜; 向珊
Original assignee: Sichuan Behome Technology Co ltd
Current assignee: Sichuan Behome Technology Co ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-05-05
Anticipated expiration: 2029-11-15

Abstract

The application provides a magnetic latching relay control circuit and a driving system, and relates to the technical field of switch circuits. The magnetic latching relay control circuit comprises an MCU, a decoder, a drive circuit and a magnetic latching relay, wherein the MCU, the decoder, the drive circuit and the magnetic latching relay are electrically connected; the MCU is used for sending a driving signal to the driving circuit through the decoder so that the driving circuit controls the magnetic latching relay to be closed or opened. The magnetic latching relay control circuit and the driving system have the advantages that the GPIO port of the MCU is saved, resource waste is avoided, and the cost is reduced.

Description

Magnetic latching relay control circuit and driving system

Technical Field

The application relates to the technical field of switch circuits, in particular to a magnetic latching relay control circuit and a driving system.

Background

The magnetic latching relay is a novel relay developed in recent years and is also an automatic switch. As with other electromagnetic relays, it acts to automatically turn on and off the circuit. The magnetic latching relay has the advantages that the normally closed state or the normally open state of the magnetic latching relay completely depends on the action of permanent magnetic steel, and the switching state of the magnetic latching relay is triggered by pulse electric signals with certain width to complete the switching. The magnetic latching relay has the characteristics of power saving, stable performance, small volume, large bearing capacity and superior performance compared with the common electromagnetic relay.

However, in the using process of the magnetic latching relay, since one magnetic latching relay at least occupies one General-purpose input/output (GPIO) port of an MCU (micro controller Unit), when the number of magnetic latching relays in the circuit is large, the magnetic latching relay will occupy a large number of GPIO ports of the MCU, which causes resource waste and increases product cost.

In conclusion, when the magnetic latching relay is used at present, the problem that a large number of GPIO ports of the MCU are occupied exists, resource waste is caused, and the product cost is increased.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a magnetic latching relay control circuit and actuating system to solve the problem that the magnetic latching relay that exists occupies MCU's GPIO mouth in a large number among the prior art.

In one aspect, the application provides a magnetic latching relay control circuit, which comprises an MCU, a decoder, a driving circuit and a magnetic latching relay, wherein the MCU, the decoder, the driving circuit and the magnetic latching relay are electrically connected; wherein the content of the first and second substances,

the MCU is used for sending a driving signal to the driving circuit through the decoder so that the driving circuit controls the magnetic latching relay to be closed and opened.

Furthermore, the magnetic latching relay is a double-coil magnetic latching relay, and the driving circuit is a current amplifying circuit;

the driving circuit is used for amplifying the current of the driving signal so as to control the on and off of the double-coil magnetic latching relay.

Furthermore, the driving circuit comprises a first driving chip and a second driving chip, the first driving chip and the second driving chip are electrically connected with the decoder, the output end of the first driving chip is electrically connected with the first control end of the double-coil magnetic latching relay, and the output end of the second driving chip is electrically connected with the second control end of the double-coil magnetic latching relay.

Furthermore, the model of the MCU is PIC45K22, the model of the decoder is CD4514BM, and the models of the first and second driver chips are ULN2803 AFWG.

Further, the magnetic latching relay is a single-coil magnetic latching relay, and the driving circuit is an H-bridge circuit;

the driving circuit is used for amplifying the current of the driving signal and controlling the current direction so as to control the on and off of the single-coil magnetic latching relay.

Furthermore, the model of the MCU is PIC45K22, the model of the decoder is CD4514BM, and the model of the H-bridge circuit is A4950.

Furthermore, the decoder comprises a latch circuit, the number of the decoders comprises a plurality of decoders, and the decoders are sequentially cascaded.

In another aspect, the present application further provides a driving system, where the driving system includes a switch circuit and the magnetic latching relay control circuit, and the switch circuit is electrically connected to the magnetic latching relay.

Compared with the prior art, the embodiment of the application has the following beneficial effects:

the application provides a magnetic latching relay control circuit and a driving system, wherein the magnetic latching relay control circuit comprises an MCU, a decoder, a driving circuit and a magnetic latching relay, and the MCU, the decoder, the driving circuit and the magnetic latching relay are electrically connected; the MCU is used for sending a driving signal to the driving circuit through the decoder so that the driving circuit controls the magnetic latching relay to be closed or opened. Because the decoder has the effect of expanding the GPIO port, the MCU sends a driving signal to the driving circuit through the decoder, and can realize the control of a plurality of magnetic latching relays through the less GPIO ports of the MCU, thereby saving the GPIO port of the MCU, not causing the resource waste, and simultaneously when the number of the magnetic latching relays is more, also can realize the control through the MCU, and then reduce the cost.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a block schematic diagram of a magnetic latching relay control circuit provided in an embodiment of the present application.

Fig. 2 is a schematic block diagram of a magnetic latching relay provided in an embodiment of the present application when the magnetic latching relay is a dual-coil magnetic latching relay.

Fig. 3 is a schematic circuit diagram of a magnetic latching relay provided in an embodiment of the present application when the magnetic latching relay is a dual-coil magnetic latching relay.

Fig. 4 is a schematic block diagram of a magnetic latching relay in a single coil according to an embodiment of the present disclosure.

Fig. 5 is a schematic circuit diagram of a magnetic latching relay in a single coil according to an embodiment of the present disclosure.

In the figure: 100-magnetic latching relay control circuit; 110-MCU; 120-a decoder; 131-a first driver chip; 132-a second driver chip; a 133-H bridge circuit; 140-magnetic latching relay.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

First embodiment

As described in the background art, the magnetic latching relay has been rapidly developed as an innovative product under the advocation of environmental protection and energy saving. Similar products are developed by relay manufacturers and widely applied to various industries.

However, for the control of the magnetic latching relay, like the control of a common relay product, one coil at least occupies one GPIO port of the MCU, and for the magnetic latching relay with bistable state, both a single coil and a double coil relay need to occupy two GPIO ports, which results in that when the number of the magnetic latching relays in the circuit is large, more GPIO ports of the MCU are occupied, resulting in resource waste; when the number of the magnetic latching relays reaches a certain value, the number of the MCUs even needs to be increased, so that the cost is increased. For example, for a circuit with 8 outputs (i.e. the circuit includes 8 magnetic latching relays), 16 GPIO ports are required for controlling the magnetic latching relays.

In view of this, the present application provides a magnetic latching relay control circuit to realize the expansion of the MCU port through the decoder.

The following is an exemplary description of the magnetic latching relay control circuit provided in the present application:

referring to fig. 1, an embodiment of the present application provides a magnetic latching relay control circuit 100, where the magnetic latching relay control circuit 100 includes an MCU110, a decoder 120, a driving circuit, and a magnetic latching relay 140, and the MCU110, the decoder 120, the driving circuit, and the magnetic latching relay 140 are electrically connected. The MCU110 is configured to send a driving signal to the driving circuit through the decoder 120, so that the driving circuit controls the magnetic latching relay 140 to be closed or opened.

The decoder 120 is a logic circuit device in which the number of output GPIO ports is greater than the number of input GPIO ports. The decoder 120 can expand the GPIO port of the MCU 110. Make MCU110 can be through a plurality of magnetic latching relays 140 of less GPIO mouth control, and then saved MCU 110's GPIO mouth, can not cause the wasting of resources, when magnetic latching relay 140's quantity is more simultaneously, also can realize control through an MCU110, and then reduced the cost.

As an implementation manner of the present application, please refer to fig. 2 and fig. 3, the magnetic latching relay 140 may be a dual-coil magnetic latching relay 140, and in this case, the driving circuit is a current amplifying circuit.

It should be noted that the double-coil magnetic latching relay 140 is a relay including two coils, one of which is used to open the relay and the other of which is used to close the relay. Since the magnetic latching relay 140 includes magnetic steel, which needs to distinguish between north and south poles, one coil of the double-coil magnetic latching relay 140 is used for attraction, and the other coil is used for repulsion.

In other words, when the magnetic latching relay 140 is a dual-coil magnetic latching relay 140, each latching relay is connected to two GPIO ports, one of the GPIO ports is used to output a forward pulse to the magnetic latching relay 140 to turn on the magnetic latching relay 140, and the other GPIO port is used to output a reverse pulse to the magnetic latching relay 140 to turn off the magnetic latching relay 140.

On this basis, the driving circuit includes a first driving chip 131 and a second driving chip 132, both the first driving chip 131 and the second driving chip 132 are electrically connected to the decoder 120, an output end of the first driving chip 131 is electrically connected to a first control end of the dual-coil magnetic latching relay 140, and an output end of the second driving chip 132 is electrically connected to a second control end of the dual-coil magnetic latching relay 140. It is understood that the first driving chip 131 is configured to output a forward pulse to the dual coil magnetic latching relay 140, and the second driving chip 132 is configured to output a reverse pulse to the dual coil magnetic latching relay 140.

As an optional implementation manner of the present application, the model of the MCU110 is PIC45K22, the model of the decoder 120 is CD4514BM, and the models of the first driver chip 131 and the second driver chip 132 are ULN2803 AFWG. Of course, in other embodiments, the model of the chip may be other models, and this application does not limit this.

Wherein the CD4514BM is the 4-16 decoder 120, that is, the outputs of the 16 GPIO ports of the decoder 120 can be controlled through the four GPIO ports of the MCU 110. It is understood that the MCU110 can control the 16 GPIO ports in a time-division multiplexing manner.

Of course, other decoders 120 may be used for decoder 120, such as 3-8 decoders 120. Also, the present application illustrates a 4-16 decoder 120.

The first driving chip 131 and the second driving chip 132 are 8 input/8 output chips, and the first driving chip 131 and the second driving chip 132 can simultaneously control 8 magnetic latching relays 140.

Compared with the prior art, when the magnetic latching relay 140 is controlled by the MCU110 in the prior art, when 8 dual-coil magnetic latching relays 140 are controlled, 16 GPIO ports of the MCU110 are required for control. By the magnetic latching relay control circuit 100 provided by the application, control can be realized only by 4 GPIO ports of the MCU 110. The occupation of the GPIO port of the MCU110 by the magnetic latching relay 140 is greatly reduced, the resource is saved, and the use is more convenient.

Namely, the working principle of the dual-coil magnetic latching relay control circuit 100 provided by the present application is as follows:

when a certain double-coil magnetic latching relay 140 needs to be controlled to work, the MCU110 sends a driving signal (i.e., a pulse current) to the first driving chip 131 in a time-sharing multiplexing manner, and the first driving chip 131 amplifies the driving signal, so as to control the ON coil of the specific double-coil magnetic latching relay 140 to start, and the double-coil magnetic latching relay 140 is in a closed state. When the dual-coil magnetic latching relay 140 needs to be controlled to be switched OFF, the MCU110 sends a driving signal (i.e., a pulse current) to the second driving chip 132 in a time-sharing multiplexing manner, and the second driving chip 132 amplifies the driving signal, so as to control the OFF coil of the specific dual-coil magnetic latching relay 140 to be switched on, and the dual-coil magnetic latching relay 140 is in a switched-OFF state.

It should be noted that the decoder 120 may include a latch circuit, and when the decoder 120 includes a latch circuit, the number of the decoders 120 may be multiple, and the multiple decoders 120 are sequentially cascaded. For example, the number of the decoders 120 may be 5, and the numbers thereof are a, b, c, d, and e, respectively, where a, b, c, d, and e are all 4-16 decoders 120, a includes a latch circuit, a is connected to 4 GPIO ports of the MCU110, and in the output IO ports of a, every 4 IO ports are divided into a group, and the output IO ports of a are connected to b, c, d, and e, respectively, thereby further implementing the extension of the GPIO ports. It can be understood that, through this expansion mode, 8 × 4 — 32 dual-coil magnetic latching relays 140 can be controlled, that is, the MCU110 controls the operating state of the 32 dual-coil magnetic latching relays 140 through 4 GPIO ports, which saves resources, and at the same time, does not need to add more MCUs 110, which saves cost.

Moreover, it can be understood that, through the implementation manner described above, the GPIO port can be further expanded by using the decoder 120 with a latch circuit, which is not limited in this application.

As another implementation manner of the present application, please refer to fig. 4 and 5, the magnetic latching relay 140 may also be a single-coil magnetic latching relay 140, and the driving circuit is an H-bridge circuit 133. And the driving circuit is used for amplifying the current of the driving signal and controlling the current direction so as to control the on and off of the single-coil magnetic latching relay 140.

The single-coil magnetic latching relay 140 includes only one coil, and the closing and opening of the single-coil magnetic latching relay 140 are controlled by controlling the positive and negative directions of the current pulse.

The model of the MCU110 is PIC45K22, the model of the decoder 120 is CD4514BM, and the model of the H-bridge circuit 133 is a 4950.

The single-coil magnetic latching relay control circuit 100 provided by the present application has the working principle that:

when a single-coil magnetic latching relay 140 needs to be controlled to operate, the MCU110 sends a driving signal (i.e., a pulse current) to the H-bridge circuit 133 (a 4950 in this application) in a time-division multiplexing manner, and the H-bridge circuit 133 amplifies the driving signal and outputs a forward pulse current at the same time, so as to control the coil of the specific single-coil magnetic latching relay 140 to start, and the single-coil magnetic latching relay 140 is in a closed state. When the single-coil magnetic latching relay 140 needs to be controlled to be switched off, the MCU110 sends a driving signal to the H-bridge circuit 133 (a 4950 in this application) in a time-division multiplexing manner, and the H-bridge circuit 133 amplifies the driving signal and outputs a negative pulse current to control the coil of the specific single-coil magnetic latching relay 140 to be switched off.

It can be understood that the decoder 120 connected to the H-bridge circuit 133 may also include a latch circuit, and when the decoder 120 includes the latch circuit, the number of the decoders 120 may also be multiple, and the multiple decoders 120 are sequentially cascaded, so as to implement expansion of the GPIO port of the MCU110, which is not described herein.

Second embodiment

The present application also provides a drive system including a switching circuit and the magnetic latching relay control circuit 100 described in the first embodiment, wherein the switching circuit is electrically connected to the magnetic latching relay 140. When the magnetic latching relay 140 in the magnetic latching relay control circuit 100 is closed, the switch circuit is turned on, and the device is started. It will be appreciated that the drive system may be applied to start various devices, such as a starter motor, etc., and the present application is not limited in this respect.

In summary, the present application provides a magnetic latching relay control circuit, which includes an MCU, a decoder, a driving circuit, and a magnetic latching relay, wherein the MCU, the decoder, the driving circuit, and the magnetic latching relay are electrically connected; the MCU is used for sending a driving signal to the driving circuit through the decoder so that the driving circuit controls the magnetic latching relay to be closed or opened. Because the decoder has the effect of expanding the GPIO port, the MCU sends a driving signal to the driving circuit through the decoder, and can realize the control of a plurality of magnetic latching relays through the less GPIO ports of the MCU, thereby saving the GPIO port of the MCU, not causing the resource waste, and simultaneously when the number of the magnetic latching relays is more, also can realize the control through the MCU, and then reduce the cost.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The magnetic latching relay control circuit is characterized by comprising an MCU, a decoder, a driving circuit and a magnetic latching relay, wherein the MCU, the decoder, the driving circuit and the magnetic latching relay are electrically connected; wherein the content of the first and second substances,

2. The magnetic latching relay control circuit according to claim 1, wherein the magnetic latching relay is a dual coil magnetic latching relay, and the drive circuit is a current amplification circuit;

3. The magnetic latching relay control circuit of claim 2, wherein the driving circuit comprises a first driving chip and a second driving chip, the first driving chip and the second driving chip are both electrically connected to the decoder, an output end of the first driving chip is electrically connected to a first control end of the dual-coil magnetic latching relay, and an output end of the second driving chip is electrically connected to a second control end of the dual-coil magnetic latching relay.

4. The magnetic latching relay control circuit of claim 3, wherein the MCU is of type PIC45K22, the decoder is of type CD4514BM, and the first driver chip and the second driver chip are of type ULN2803 AFWG.

5. The magnetic latching relay control circuit of claim 1, wherein the magnetic latching relay is a single coil magnetic latching relay, and the drive circuit is an H-bridge circuit;

6. The magnetic latching relay control circuit of claim 5, wherein the MCU is of type PIC45K22, the decoder is of type CD4514BM, and the H-bridge circuit is of type A4950.

7. The magnetic latching relay control circuit according to claim 1, wherein said decoder includes a latch circuit, the number of said decoders includes a plurality, and a plurality of said decoders are cascade-connected in sequence.

8. A drive system comprising a switch circuit and a magnetic latching relay control circuit according to any one of claims 1 to 7, the switch circuit being electrically connected to the magnetic latching relay.