A driving circuit, device and charging pile of a single-coil magnetic latching relay

Abstract

The utility model provides a kind of driving circuit, device and charging pile of single-coil magnetic latching relay, it is related to relay control technical field.The control circuit includes drive control circuit and coil excitation flip circuit, drive control circuit is connected MCU and receives its output signal, for controlling the on-off of contact relay;The output end of contact relay is connected the coil of double conversion contact relay in coil excitation flip circuit, and the coil of single-coil magnetic latching relay is connected to the both ends of double conversion contact relay, to realize its state switching.The circuit structure of the present application is simple, response speed is fast, and it is strong in versatility, can guarantee that original signal driving control does not change.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, specifically to a driving circuit, device, and charging pile for a single-coil magnetic latching relay. Background Technology

[0002] With the increasing popularity of electric vehicles, the demand for DC charging stations is also gradually increasing. Traditional DC charging stations typically continue to supply power to the internal charging modules when no vehicles are charging, which not only causes unnecessary energy waste but also shortens the lifespan of the equipment. Therefore, it is necessary to cut off the power supply circuit of the charging modules inside the station when there is no charging demand to reduce power consumption. The conventional approach is to control the power supply status of the charging modules through an external AC contactor. However, some charging modules are now adopting a design with built-in AC contactors, and the internal contactor control circuit is implemented through a single-coil magnetic latching relay.

[0003] Single-coil magnetic latching relays achieve state switching by applying both positive and negative excitations. Existing technology typically uses the rising or falling edge of the control signal to trigger a drive pulse generation unit, generating a drive pulse signal with positive and negative transitions. This signal is then compared with a comparator by a pulse bandwidth setting unit to form two drive signals of opposite polarity. Finally, the power drive module drives the magnetic latching relay to complete the state switching. However, this control circuit structure is complex and inconvenient for interfacing existing products with new components. It cannot guarantee that the open and closed states of the single-coil magnetic latching relay can be achieved without modifying the existing charging pile control circuit. Utility Model Content

[0004] To solve the above problems, this utility model provides a driving circuit for a single-coil magnetic latching relay, comprising:

[0005] The drive control circuit is used to connect to the MCU and receive the MCU's output signals.

[0006] The coil excitation flip-over circuit is used to provide voltage excitation to the single-coil magnetic latching relay according to the control signal of the drive control circuit;

[0007] The drive control circuit includes a contact relay, and the drive control circuit controls the opening and closing of the contacts of the contact relay according to the output signal of the MCU;

[0008] The coil excitation flip-over circuit includes a double-change contact relay, and the output signal of the contact relay is input to the double-change contact relay.

[0009] The contacts of the dual-change contact relay are connected to the coil terminals of the single-coil magnetic latching relay, which is used to realize the state switching of the single-coil magnetic latching relay.

[0010] According to one embodiment, a drive control circuit is provided, which further includes a first transistor, an optocoupler, and a second transistor. The base of the first transistor is connected to the output signal of the MCU. The LED cathode of the optocoupler is connected to the collector of the first transistor. The collector of the phototransistor of the optocoupler is connected to the base of the second transistor. The collector of the second transistor is connected to the coil of the contact relay.

[0011] Based on the above scheme, the first transistor is an NPN transistor and the second transistor is a PNP transistor. When the base of the first transistor receives a high level, the collector and emitter of the first transistor are turned on. When the base of the second transistor receives a low level, the collector and emitter of the second transistor are turned on.

[0012] Furthermore, the dual-change contact relay includes two sets of changeover contacts. When the contacts of the contact relay are closed, the coil of the dual-change contact relay is energized, and the two sets of changeover contacts switch states synchronously.

[0013] According to another embodiment, the contacts of the dual-change contact relay are connected to a plurality of first connectors, each first connector corresponding to a plurality of channels of a single-coil magnetic latching relay, and the plurality of first connectors are connected in parallel.

[0014] Preferably, the drive control circuit is connected to the coil excitation switching circuit via a second connector and a third connector. The contacts of the contact relay are respectively connected to the first end and the second end of the second connector. The first end of the second connector is connected to an external power supply. The second end of the second connector is connected to the third connector. The third connector is connected to the coil end of the double-change contact relay of the coil excitation switching circuit.

[0015] On the other hand, this application also provides a driving device for a single-coil magnetic latching relay, including the driving circuit of the single-coil magnetic latching relay described above.

[0016] In another aspect, embodiments of this application include a charging pile, comprising the driving circuit of the single-coil magnetic latching relay described above.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. By working together with the drive control circuit and the coil excitation flipping circuit, bidirectional voltage excitation control of a single-coil magnetic latching relay is achieved. The circuit structure is simple, the control is convenient, and there is no need to change the original control signal.

[0019] 2. The coil excitation flip circuit connects to a multi-channel single-coil magnetic latching relay via a connector, enabling output control of the multi-channel single-coil magnetic latching relay through a single control signal. It is suitable for centralized control of multiple loads. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the overall solution of this utility model;

[0021] Figure 2 This is a schematic diagram of the drive control circuit of this utility model;

[0022] Figure 3 This is a schematic diagram of the coil excitation and flipping circuit of this utility model;

[0023] Figure 4 This is a schematic diagram of the connector of this utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Furthermore, the terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data used can be interchanged where appropriate so that embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] This application provides a driving circuit for a single-coil magnetic latching relay, ensuring that the original signal driving control remains unchanged, and realizing the coil level flipping of the magnetic latching relay by adding a coil excitation flipping circuit.

[0028] like Figure 1As shown, this application includes a drive control circuit and a coil excitation switching circuit. The drive control circuit is connected to an MCU and controls the contacts of the contact relay according to the output signal. The contact relay is connected to a double-change contact relay of the coil excitation switching circuit, and the contacts of the double-change contact relay are connected to the coil terminal of a single-coil magnetic latching relay. The normally open or normally closed state of the contact relay is controlled by the output signal of the MCU. The normally open or normally closed state of the contact relay further controls the switching contact state of the double-change contact relay of the coil excitation switching circuit, thereby realizing the positive and negative voltage excitation of the single-coil magnetic latching relay.

[0029] Specifically, such as Figure 2 As shown, the drive control circuit includes a first transistor Q27, an optocoupler U31, a second transistor Q25, and a contact relay K13. Q27 is an NPN transistor, and Q25 is a PNP transistor. The MCU outputs a first signal ARM_DO_14, which is high. This high-level signal is input to the base of Q27, causing the collector and emitter to conduct. The collector of Q27 is connected to the LED cathode of the optocoupler, and the emitter of Q27 is grounded. The LED cathode of the optocoupler is also grounded, turning on the LED and thus the phototransistor of the optocoupler. The collector of the phototransistor is connected to the base of Q25, and the collector of Q25 is connected to the coil of K13. The coil is energized, causing the contacts of the contact relay to change from normally open to normally closed. The two ends of the contacts are DO_14 and DO_COM.

[0030] The working principle of this drive control circuit is as follows: ARM_DO_14 is a general GPIO port of the MCU. When ARM_DO_14 is high, the base of Q27 is pulled high, and the collector and emitter of Q27 are turned on. The level of pin 2 of U31 is pulled low to GND through Q27. At this time, a current is generated between pin 1 and pin 2 of U31, which makes pin 3 and pin 4 of U31 turn on. At this time, the base of Q25 is pulled low, and the collector and emitter of Q25 are turned on. The coil of K13 is energized and conducts to obtain 12V voltage. K13 is a normally open contact relay, so the contact is closed, and DO_14 and DO_COM are turned on. Conversely, when ARM_DO_14 is low, the coil of K13 is not energized, the contact state does not change, and DO_14 and DO_COM are not turned on.

[0031] The aforementioned drive control circuit, composed of an NPN transistor, an optocoupler, a PNP transistor, and a normally open contact relay, enables efficient and safe control of the relay contacts by the MCU. The circuit achieves electrical isolation between the control and drive sides through the optocoupler, enhancing the system's anti-interference capability and safety. The two-stage amplification structure using transistors enables the low-voltage MCU to effectively drive the high-voltage relay. Furthermore, the circuit features a simple structure, fast response speed, low power consumption, and is easy to modularly expand, making it suitable for multi-load control scenarios such as industrial automation and intelligent power distribution.

[0032] like Figure 3 As shown, the coil excitation switching circuit includes a double-change contact relay RLY1. One end of the coil of RLY1 is grounded, and the other end is connected to an external input power supply of 12V_A. The contacts are two sets of changeover contacts, which output DO_A1 and DO_B1 respectively.

[0033] The working principle of the coil excitation switching circuit is as follows: when the 12V_A voltage is 0, the RLY1 coil is not energized, and the contacts remain at the normally closed end, that is, DO_A1 is connected to the 12V power supply, and DO_B1 is grounded; when the 12V_A voltage is 12V, the RLY1 coil is energized, and the contacts remain at the normally open end, at this time DO_A1 is grounded, and DO_B1 is connected to the 12V power supply.

[0034] Furthermore, the drive control circuit is connected to the coil excitation and flipping circuit using a connector, such as... Figure 4 As shown, the connection between the two is achieved through the second connector J9 and the third connector J4. The first and second ends of J9 are connected to DO_COM and DO_14 of the K13 contact, respectively. The first end is connected to an external 12VDC, and the second end is connected to the second end of J4 (12V_A). The first end (12V) and the fourth end (GND) of J4 are connected to an external 12VDC and ground, respectively. The output terminals DO_A1 and DO_B1 of the coil excitation switching circuit are connected to the control points of the built-in AC contactor of the charging module, which are the coil ends of the single-coil magnetic latching relay. The forward and reverse voltage excitation of the single-coil magnetic latching relay is controlled through DO_A1 and DO_B1.

[0035] The general working principle of this application is as follows: When ARM_DO_14 is set to low level, there is no conduction between DO_14 and DO_COM, DO_14 is 0V, and DO_14 is connected to 12V_A, so the voltage of 12V_A is also 0V. At this time, DO_A1 is 12V and DO_B1 is 0V, and the external magnetic latching relay receives positive voltage excitation. When ARM_DO_14 is set to high level, DO_14 and DO_COM are connected, that is, DO_14 is 12V. At this time, the voltage of 12V_A is 12V, and the two sets of switching contacts of the double-change contact relay switch states synchronously. At this time, DO_A1 is 0V and DO_B1 is 12V, and the external magnetic latching relay receives reverse voltage excitation.

[0036] This application controls the on / off state of a contact relay by outputting a signal from an MCU, thereby controlling the energization state of the coil of the double-change contact relay and ultimately changing the polarity of its output voltage to provide a directionally controllable excitation voltage for the magnetic latching relay. Since the magnetic latching relay only requires instantaneous voltage excitation to complete state switching, this embodiment has advantages such as fast response speed, high control accuracy, and low power consumption, while avoiding the complex structure required by traditional control circuits.

[0037] Based on the above embodiments, the coil excitation switching circuit of this application controls a multi-channel magnetic latching relay through a first connector, including multiple first connectors such as J1, J2, and J3, as follows: Figure 4 As shown, J1, J2, and J3 are connected to the coil terminals of the single-coil magnetic latching relay, and J1, J2, and J3 are connected to DO_A1 and DO_B1 respectively. J1, J2, and J3 are connected in parallel, which synchronously realizes the output control of the multi-channel single-coil magnetic latching relay by the control signal.

[0038] By synchronously controlling multiple magnetic latching relay channels with a single control signal, not only is reliable switching of the magnetic latching relay state achieved, but it also has advantages such as fast response speed, low power consumption, clear control logic, and easy expansion.

[0039] This application also provides a driving device for a single-coil magnetic latching relay, including the driving circuit of the single-coil magnetic latching relay described above. The control circuit is used to drive the coil of the single-coil magnetic latching relay according to the control signal output by the MCU, so as to realize the switching between its open and closed states.

[0040] Based on the same inventive concept, this utility model also provides a charging pile, which includes a charging module. The charging module is equipped with a driving circuit for the single-coil magnetic latching relay described above. This circuit can control the on / off state of multiple channels of single-coil magnetic latching relays through the ordinary GPIO interface of the MCU without changing the original charging pile control circuit.

[0041] In practical applications, since most charging pile companies' existing product control boards have undergone long-term verification and possess good stability and reliability, when upgrading products or replacing them with power modules containing built-in AC contactors, it is preferable to keep the original control board unchanged and only add an adaptive drive circuit at its output end to control the single-coil magnetic latching relay. This approach not only avoids hardware modifications to the control board, thus ensuring system stability, but also significantly reduces development costs, manpower investment, and R&D cycles associated with board upgrades.

[0042] Furthermore, to meet the requirements of multi-channel control, this invention also includes a coil excitation flip circuit board. This circuit board receives standard control signals (such as high and low level signals) from the control board to achieve independent control of multiple charging modules. This design has good scalability and flexibility and can be widely used in single-pile charging piles and split-type charging pile products.

[0043] Furthermore, to facilitate modular installation and subsequent maintenance, the coil excitation flip circuit board is equipped with multiple standardized connector interfaces, each corresponding to the coil end of the single-coil magnetic latching relay in each charging module. This connector-based reliable electrical connection not only improves system assembly efficiency but also facilitates rapid replacement and maintenance of modules or drive circuits later on.

[0044] The foregoing has shown and described the basic principles and main features of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this utility model.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A driving circuit for a single-coil magnetic latching relay, characterized in that, include: The drive control circuit is used to connect to the MCU and receive the MCU's output signals. The coil excitation flip-over circuit is used to provide voltage excitation to the single-coil magnetic latching relay according to the control signal of the drive control circuit; The drive control circuit includes a contact relay, and the drive control circuit controls the opening and closing of the contacts of the contact relay according to the output signal of the MCU; The coil excitation flip-over circuit includes a double-change contact relay, and the output signal of the contact relay is input to the double-change contact relay. The contacts of the dual-change contact relay are connected to the coil terminals of the single-coil magnetic latching relay, which is used to realize the state switching of the single-coil magnetic latching relay.

2. The driving circuit for the single-coil magnetic latching relay according to claim 1, characterized in that, The drive control circuit also includes a first transistor, an optocoupler, and a second transistor. The base of the first transistor is connected to the output signal of the MCU. The LED cathode of the optocoupler is connected to the collector of the first transistor. The collector of the phototransistor of the optocoupler is connected to the base of the second transistor. The collector of the second transistor is connected to the coil of the contact relay.

3. The driving circuit for the single-coil magnetic latching relay according to claim 2, characterized in that, The first transistor is an NPN transistor, and the second transistor is a PNP transistor. When the base of the first transistor receives a high level, the collector and emitter of the first transistor are turned on. When the base of the second transistor receives a low level, the collector and emitter of the second transistor are turned on.

4. The driving circuit of the single-coil magnetic latching relay according to claim 1, characterized in that, The dual-change contact relay includes two sets of changeover contacts. When the contacts of the relay are closed, the coil of the dual-change contact relay is energized, and the two sets of changeover contacts switch states synchronously.

5. The driving circuit for the single-coil magnetic latching relay according to claim 4, characterized in that, The contacts of the dual-change contact relay are connected to multiple first connectors, each first connector corresponding to multiple channels of the single-coil magnetic latching relay, and the multiple first connectors are connected in parallel.

6. The driving circuit for the single-coil magnetic latching relay according to claim 2, characterized in that, The drive control circuit is connected to the coil excitation switching circuit through the second connector and the third connector. The contacts of the contact relay are respectively connected to the first end and the second end of the second connector. The first end of the second connector is connected to an external power supply. The second end of the second connector is connected to the third connector. The third connector is connected to the coil end of the double-change contact relay of the coil excitation switching circuit.

7. A driving device for a single-coil magnetic latching relay, characterized in that, The driving circuit includes the single-coil magnetic latching relay as described in any one of claims 1-6.

8. A charging pile, characterized in that, The driving circuit includes the single-coil magnetic latching relay as described in any one of claims 1-6.

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