Relay drive circuit, relay device, and electronic apparatus

Abstract

The utility model discloses a drive circuit of a relay, a relay device and an electronic device, and relates to the technical field of relay driving, the drive circuit is connected with an auxiliary contact of the relay, the drive circuit comprises a voltage dividing module, a first end of the voltage dividing module is connected with the auxiliary contact, and a second end of the voltage dividing module is grounded; the voltage dividing module is used for providing first current; the first end of the driving capacitor is connected with the auxiliary contact and the first end of the voltage dividing module, the second end of the driving capacitor is connected with the first end of the driving resistor, and the second end of the driving resistor is grounded; and the driving capacitor and the driving resistor are used for forming a second current at the moment of actuation of the auxiliary contact, so that the auxiliary contact is conducted under the combined action of the first current and the second current. The drive circuit of the relay provided by the utility model is not only low in power consumption and simple in circuit structure, but also can ensure the reliable conduction of the auxiliary contact of the relay so as to improve the use reliability of the auxiliary contact of the relay.

Description

Technical Field

[0001] The utility model relates to the technical field of relay driving, in particular to a driving circuit of a relay, a relay device and an electronic device. Background Technique

[0002] In the new energy industry, as an important switching component, the safety of the relay cannot be ignored. To improve the safety performance of related electronic devices in the new energy industry, relays equipped with auxiliary contacts are generally adopted in electronic devices in the industry to detect the working state of the relay by using the auxiliary contacts. Thus, related electronic devices in the new energy industry can implement a more reliable safety protection mechanism.

[0003] However, affected by the material of the auxiliary contact, there is a risk of oxidation after long-term use, and the auxiliary contact may be at risk of non-conduction after oxidation. To ensure that the auxiliary contact of the relay will not be at risk of non-conduction due to oxidation, currently, a large current is usually directly used to drive the relay to work on the conduction branch of the auxiliary contact. However, this method has high power consumption; or a switching tube (such as a MOS tube) is used to dynamically adjust the conduction branch of the auxiliary contact and the magnitude of the current flowing when the auxiliary contact is attracted and after attraction. However, this method requires an additional control circuit for the switching tube in the circuit, and the circuit structure is relatively complex. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a driving circuit of a relay, aiming to use a driving circuit with low power consumption and a simple circuit structure to ensure the reliable conduction of the auxiliary contact of the relay, so as to improve the reliability of use of the auxiliary contact of the relay.

[0005] To achieve the above object, the utility model proposes a driving circuit of a relay. The driving circuit is connected to the auxiliary contact of the relay. The driving circuit includes:

[0006] A voltage dividing module, the first end of the voltage dividing module is connected to the auxiliary contact, the second end of the voltage dividing module is grounded, and the voltage dividing module is used to provide a first current;

[0007] A driving capacitor and a driving resistor, the first end of the driving capacitor is respectively connected to the auxiliary contact and the first end of the voltage dividing module, the second end of the driving capacitor is connected to the first end of the driving resistor, and the second end of the driving resistor is grounded; the driving capacitor and the driving resistor are used to form a second current at the moment when the auxiliary contact is attracted, so that the auxiliary contact is conducted under the combined action of the first current and the second current.

[0008] In one embodiment, the resistance value of the driving resistor is less than or equal to 1 kΩ.

[0009] In one embodiment, the capacitance of the driving capacitor is greater than or equal to 1 microfarad.

[0010] In one embodiment, the voltage dividing module includes a first voltage dividing resistor and a second voltage dividing resistor;

[0011] The first end of the first voltage dividing resistor is respectively connected to the auxiliary contact and the first end of the driving capacitor, the second end of the first voltage dividing resistor is connected to the first end of the second voltage dividing resistor, and the second end of the second voltage dividing resistor is grounded.

[0012] In one embodiment, when the relay includes a plurality of auxiliary contacts, the driving circuit further includes a switching module;

[0013] The first end of the switching module is used to connect each of the auxiliary contacts, and the second end of the switching module is respectively connected to the first end of the driving capacitor and the first end of the voltage dividing module;

[0014] The switching module is used to switch the auxiliary contact to be conducted.

[0015] In addition, to achieve the above object, the present utility model further provides a relay device, which includes a relay and the driving circuit of the above relay, and the driving circuit is connected to the auxiliary contact of the relay.

[0016] In one embodiment, the relay device further includes a micro control unit and a power switch tube;

[0017] The micro control unit is connected to the voltage dividing module of the driving circuit, the drain of the power switch tube is connected to the coil of the relay, the gate of the power switch tube is connected to the micro control unit, and the source of the power switch tube is grounded;

[0018] The power switch tube is used to increase the magnitude of the driving current for driving the relay to operate.

[0019] In one embodiment, the relay device further includes a driving power supply;

[0020] The driving power supply is connected to the auxiliary contact of the relay.

[0021] In one embodiment, the voltage value of the driving power supply is greater than 10 volts.

[0022] In addition, to achieve the above object, the present utility model further provides an electronic device, which includes a relay and the driving circuit of the above relay, and the driving circuit is connected to the auxiliary contact of the relay.

[0023] The present utility model provides a driving circuit for a relay. The driving circuit is connected to an auxiliary contact of the relay. The driving circuit includes: a voltage dividing module, a first end of the voltage dividing module is connected to the auxiliary contact, a second end of the voltage dividing module is grounded, and the voltage dividing module is used to provide a first current; a driving capacitor and a driving resistor, a first end of the driving capacitor is respectively connected to the auxiliary contact and the first end of the voltage dividing module, a second end of the driving capacitor is connected to a first end of the driving resistor, and a second end of the driving resistor is grounded; the driving capacitor and the driving resistor are used to form a second current at the moment when the auxiliary contact is attracted, so that the auxiliary contact is turned on under the combined action of the first current and the second current. Due to the characteristic that the voltage across both ends of a capacitor cannot change suddenly, at the moment when the auxiliary contact is attracted, the driving capacitor will start to charge, and the driving capacitor allows current to pass through during the charging process. Therefore, at the moment when the auxiliary contact is attracted, the driving capacitor can form a second current with the driving resistor, so that the auxiliary contact will be attracted under the combined action of the first current and the second current and achieve conduction. Further, after a period of time when the auxiliary contact is attracted, the driving capacitor is fully charged. In view of the characteristic that the voltage across both ends of the capacitor cannot change suddenly, the driving capacitor will prevent current from continuing to pass through, so that the driving capacitor and the driving resistor will no longer form a second current. Thus, after the auxiliary contact is turned on, it will only be affected by the first current, thereby avoiding the problem of high power consumption caused by the auxiliary contact being always affected by a large current before and after conduction, and reducing the power consumption.

[0024] Therefore, in the process of using the provided driving capacitor and driving resistor in the present utility model to achieve reliable conduction of the auxiliary contact of the relay and improve the reliability of use of the auxiliary contact of the relay, not only does it not require an additional control circuit in the circuit, thus simplifying the circuit structure; but also it can avoid the auxiliary contact being always affected by a large current before and after conduction, thereby reducing the power consumption.

[0025] In summary, the driving circuit for the relay provided by the present utility model not only has low power consumption and a simple circuit structure, but also can ensure reliable conduction of the auxiliary contact of the relay to improve the reliability of use of the auxiliary contact of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0027] Figure 1 It is a schematic circuit structure diagram for a conventional circuit that uses a 3.3V driving power supply to drive a relay to work provided by an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of a circuit structure for conventionally ensuring reliable conduction of the auxiliary contacts of a relay provided by an embodiment of the present invention;

[0029] Figure 3 This is another schematic diagram of a circuit structure for conventionally ensuring reliable conduction of the auxiliary contacts of a relay provided by an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the circuit structure of the driving circuit of the relay provided by the first embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the circuit structure of the driving circuit of the relay provided by the first embodiment of the present invention when the voltage dividing module includes a first voltage dividing resistor and a second voltage dividing resistor;

[0032] Figure 6 This is a schematic diagram of the circuit structure of the driving circuit of the relay provided by the second embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of a structure of the relay device provided by an embodiment of the present invention;

[0034] Figure 8 This is another schematic diagram of the structure of the relay device provided by an embodiment of the present invention.

[0035] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings.

[0036] Explanation of the reference numerals in the drawings:

[0037] 10. Voltage dividing module; C1, driving capacitor; Rx, driving resistor; R1, first voltage dividing resistor; R2, second voltage dividing resistor; 100, relay; 200, micro control unit; Q1, power switching transistor; GND, ground; A1 - An, auxiliary contacts. Detailed implementation manners

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] It should be noted that the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0041] In the new energy industry, as an important switching component, the safety of the relay cannot be ignored. To improve the safety performance of related electronic devices in the new energy industry, relays equipped with auxiliary contacts are generally adopted in electronic devices in the industry to detect the working state of the relay by using the auxiliary contacts. Thus, related electronic devices in the new energy industry can implement a more reliable safety protection mechanism.

[0042] However, affected by the material of the auxiliary contact, there is a risk of oxidation after long-term use, and the auxiliary contact may become non-conductive after oxidation. Therefore, during the actual use of a relay equipped with an auxiliary contact, it is usually necessary to use a voltage above 10V and a current above 10mA to break through the oxide layer of the auxiliary contact to ensure the reliability of the use of the auxiliary contact.

[0043] On this basis, during the process of driving the relay to work, if the auxiliary contact of the relay continues to be connected to a 3.3V driving power supply as Figure 1 shown, there will be a risk of non-conduction, thus affecting the reliability of the use of the auxiliary contact.

[0044] To ensure that the auxiliary contact of the relay will not become non-conductive due to oxidation, currently, it is usually to directly use a large current to drive the relay to work on the conduction branch of the auxiliary contact. Specifically, reference can be made to Figure 2 (The auxiliary contact is connected to a 12V driving power supply, so the magnitude of the current flowing through the conduction branch of the auxiliary contact will always remain the ratio of 12V to the sum of the resistances of the two resistors). However, in this way, because the auxiliary contact is always affected by a large current before and after conduction, its power consumption is high; or a switching tube (such as a MOS tube) is used to dynamically adjust the magnitude of the current flowing through the conduction branch of the auxiliary contact when the auxiliary contact is attracted and after being attracted. Specifically, reference can be made to Figure 3 . However, this method requires an additional control circuit for the switching tube in the circuit, and the circuit structure is relatively complex.

[0045] Based on this, the present utility model provides a driving circuit for a relay. In the first embodiment of the present utility model, please refer toFigure 4 , the driving circuit is connected to the auxiliary contact A1 of the relay 100. The driving circuit may include a voltage dividing module 10, a driving capacitor C1, and a driving resistor Rx. The first end of the voltage dividing module 10 is connected to the auxiliary contact A1, and the second end of the voltage dividing module 10 is grounded to GND. The first end of the driving capacitor C1 is respectively connected to the auxiliary contact A1 and the first end of the voltage dividing module 10. The second end of the driving capacitor C1 is connected to the first end of the driving resistor Rx, and the second end of the driving resistor Rx is grounded to GND. The voltage dividing module 10 is used to provide a first current. The driving capacitor C1 and the driving resistor Rx are used to form a second current at the moment when the auxiliary contact A1 is closed, so that the auxiliary contact A1 is turned on under the combined action of the first current and the second current.

[0046] It should be noted that the magnitude of the second current formed by the driving capacitor C1 and the driving resistor Rx at the moment when the auxiliary contact A1 is closed is actually the ratio of the voltage value of the driving power supply connected to the auxiliary contact A1 to the resistance value of the driving resistor Rx. Specifically, it can be referred to the following formula 1:

[0047]

[0048] Wherein, I2 is the second current, Vcc is the voltage value of the driving power supply connected to the auxiliary contact A1, and r x is the resistance value of the driving resistor Rx. To ensure that the auxiliary contact A1 of the relay 100 can be reliably turned on, the second current should not be too small, and the voltage value of the driving power supply connected to the auxiliary contact A1 is usually fixed. Therefore, the resistance value of the driving resistor Rx should not be too large. In a feasible implementation manner, the driving resistor Rx can be set as a resistor with a resistance value less than or equal to 1 kΩ.

[0049] It can be understood that in view of the characteristic that the voltage across the two ends of the capacitor cannot change suddenly, at the moment when the auxiliary contact A1 is closed, the driving capacitor C1 will start to charge, and the driving capacitor C1 allows current to pass through during the charging process. Therefore, at the moment when the auxiliary contact A1 is closed, the driving capacitor C1 can form a second current with the driving resistor Rx. Thus, the auxiliary contact A1 will be simultaneously affected by the first current and the second current, that is, the magnitude of the current acting on the auxiliary contact A1 is the sum value of the first current and the second current. After a period of time when the auxiliary contact A1 is completely closed, the driving capacitor C1 is fully charged, and the driving capacitor C1 will prevent the current from continuing to pass through. Therefore, the driving capacitor C1 and the driving resistor Rx will no longer form a second current. Thus, the auxiliary contact A1 will only be affected by the first current.

[0050] In a feasible implementation manner, please refer to Figure 5, the voltage dividing module 10 may include a first voltage dividing resistor R1 and a second voltage dividing resistor R2; a first end of the first voltage dividing resistor R1 is respectively connected to an auxiliary contact A1 and a first end of a driving capacitor C1, a second end of the first voltage dividing resistor R1 is connected to a first end of the second voltage dividing resistor R2, and a second end of the second voltage dividing resistor R2 is grounded to GND.

[0051] It should be noted that, in this embodiment, the magnitude of the first current provided by the voltage dividing module 10 is substantially the ratio of the voltage value of the driving power supply connected to the auxiliary contact A1 to the sum of the resistance values of the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and the specific formula can be referred to as formula 2 below:

[0052]

[0053] Wherein, I1 is the first current, Vcc is the voltage value of the driving power supply connected to the auxiliary contact A1, r1 is the resistance value of the first voltage dividing resistor, and r2 is the resistance value of the second voltage dividing resistor R2.

[0054] This embodiment provides a driving circuit for a relay. The driving circuit is connected to the auxiliary contact A1 of the relay 100. The driving circuit includes: a voltage dividing module 10, a first end of the voltage dividing module 10 is connected to the auxiliary contact A1, a second end of the voltage dividing module 10 is grounded, and the voltage dividing module 10 is used to provide a first current; a driving capacitor C1 and a driving resistor Rx, a first end of the driving capacitor C1 is respectively connected to the auxiliary contact A1 and a first end of the voltage dividing module 10, a second end of the driving capacitor C1 is connected to a first end of the driving resistor Rx, and a second end of the driving resistor Rx is grounded; the driving capacitor C1 and the driving resistor Rx are used to form a second current at the moment when the auxiliary contact A1 is closed, so that the auxiliary contact A1 is turned on under the combined action of the first current and the second current. Due to the characteristic that the voltage across the two ends of a capacitor cannot change suddenly, at the moment when the auxiliary contact A1 is closed, the driving capacitor C1 will start to charge, and the driving capacitor C1 allows current to pass through during the charging process. Therefore, at the moment when the auxiliary contact A1 is closed, the driving capacitor C1 can form a second current with the driving resistor Rx, so that the auxiliary contact A1 will be closed under the combined action of the first current and the second current to achieve conduction. Further, after a period of time when the auxiliary contact A1 is closed, the driving capacitor C1 is fully charged. In view of the characteristic that the voltage across the two ends of a capacitor cannot change suddenly, the driving capacitor C1 will prevent current from continuing to pass through, so that the driving capacitor C1 and the driving resistor Rx will no longer form a second current. Thus, after being turned on, the auxiliary contact A1 will only be affected by the first current, thereby avoiding the problem of high power consumption caused by the auxiliary contact A1 being affected by a large current before and after conduction, and reducing the power consumption.

[0055] Therefore, in this embodiment, when using the provided driving capacitor C1 and driving resistor Rx to achieve reliable conduction of the auxiliary contact A1 of the relay 100 and improve the reliability of use of the auxiliary contact A1 of the relay 100, not only is there no need to additionally add a control circuit in the circuit, thus simplifying the circuit structure; but also it can avoid the auxiliary contact A1 being constantly affected by a large current before and after conduction, thereby reducing power consumption.

[0056] In summary, it can be seen that the driving circuit of the relay 100 provided in this embodiment not only has low power consumption and a simple circuit structure, but also can ensure reliable conduction of the auxiliary contact A1 of the relay 100 to improve the reliability of use of the auxiliary contact A1 of the relay 100.

[0057] In a feasible implementation manner, the charging duration of the driving capacitor C1 is greater than or equal to a preset duration, and the preset duration is greater than the breakdown duration of the auxiliary contact A1.

[0058] It should be noted that the charging duration of the driving capacitor C1 refers to the time required to store the charge in the driving capacitor C1 to a certain amount of electricity. The breakdown duration of the auxiliary contact A1 refers to the time required to break down the auxiliary contact A1, that is, the time required for the auxiliary contact A1 to start attracting until it is completely attracted (i.e., complete conduction). To ensure reliable conduction of the auxiliary contact A1, the minimum charging duration that the driving capacitor C1 should reach is the preset duration. The preset duration can be a default value, such as 10 microseconds; it can also be flexibly set by the user according to the actual situation, and this embodiment does not make specific limitations on this.

[0059] In this implementation manner, by setting the driving capacitor C1 whose charging duration is greater than the breakdown duration, it effectively avoids the situation where the current acting on the auxiliary contact A1 becomes smaller due to the driving capacitor C1 completing charging prematurely during the process of breaking down the auxiliary contact A1. This design ensures that during the entire breakdown process, the auxiliary contact A1 can continuously receive the action of a large current (i.e., the combined action of the first current and the second current) until it is completely broken down, thereby ensuring reliable conduction of the auxiliary contact A1 of the relay 100 and improving the reliability of use of the auxiliary contact A1 of the relay 100.

[0060] In a feasible implementation manner, combining the foregoing formula 1 and formula 2, it can be seen that the magnitudes of the first current and the second current are positively correlated with the voltage value of the driving power supply connected to the auxiliary contact A1. Thus, to ensure that a sufficient large current acts on the auxiliary contact A1 during the process of breaking down the auxiliary contact A1, the auxiliary contact A1 of the relay 100 can be connected to a 12V driving power supply.

[0061] On this basis, in a feasible implementation manner, the capacitance of the driving capacitor C1 can be greater than or equal to 1 microfarad.

[0062] It should be noted that the capacitance of the driving capacitor C1 determines the charging duration of the driving capacitor C1, and the capacitance is positively correlated with the charging duration, that is, the larger the capacitance, the longer the charging duration. Among them, the charging duration of the driving capacitor C1 refers to the time required to store the charge in the driving capacitor C1 to a certain amount of electricity.

[0063] It can be understood that during the process of breaking down the auxiliary contact A1, if the driving capacitor C1 completes charging prematurely, that is, the charging duration of the driving capacitor C1 is less than the breakdown duration of the auxiliary contact A1, it will cause the current acting on the auxiliary contact A1 to become smaller. Among them, the breakdown duration of the auxiliary contact A1 refers to the time required to break down the auxiliary contact A1, that is, the time required for the auxiliary contact A1 to be fully closed (i.e., complete conduction) from the start of closing.

[0064] Therefore, in this embodiment, by setting the driving capacitor C1 with a capacitance greater than or equal to 1 microfarad, it effectively avoids the situation that the current acting on the auxiliary contact A1 becomes smaller due to the premature completion of the charging of the driving capacitor C1 during the process of breaking down the auxiliary contact A1. This design ensures that during the entire breakdown process, the auxiliary contact A1 can continuously receive the action of a large current (i.e., the combined action of the first current and the second current) until it is completely broken down, thereby ensuring the reliable conduction of the auxiliary contact A1 of the relay 100 and improving the reliability of use of the auxiliary contact A1 of the relay 100.

[0065] Based on the above first embodiment, a second embodiment of the driving circuit of the relay of the present utility model is proposed. In the second embodiment, in the case where the relay 100 includes a plurality of auxiliary contacts A1 to An, please refer to Figure 6 , the driving circuit may further include a switching module 20; the first end of the switching module 20 is used to connect each of the auxiliary contacts A1 to An, and the second end of the switching module 20 is respectively connected to the first end of the driving capacitor C1 and the first end of the voltage dividing module 10; the switching module 20 is used to switch the auxiliary contact to be conducted.

[0066] It should be noted that the switching module 20 can complete the switching of the auxiliary contact to be conducted by switching the auxiliary contact connected to the first end of the switching module 20. That is, for which auxiliary contact of the relay 100 needs to be conducted, the first end of the switching module 20 will be connected to that auxiliary contact.

[0067] In a feasible embodiment, the switching module 20 can be a single-pole multi-throw switch, where the number of throws in the single-pole multi-throw switch is the same as the number of auxiliary contacts included in the relay 100. For example, if the relay 100 includes two auxiliary contacts A1 and A2, then the single-pole multi-throw switch is a single-pole double-throw switch.

[0068] In another feasible implementation, the switching module 20 can be composed of multiple single-pole single-throw switches, and the number of single-pole single-throw switches included in the switching module 20 is the same as the number of auxiliary contacts included in the relay 100.

[0069] The present utility model further provides a relay device, which includes a relay 100 and the driving circuit of the above-mentioned relay, and the driving circuit is connected to the auxiliary contact A1 of the relay 100; the structure of the driving circuit can refer to the above-mentioned embodiment and will not be elaborated here.

[0070] In a feasible implementation, please refer to Figure 7 , the relay device may further include a microcontroller unit 200; the microcontroller unit 200 is connected to the voltage dividing module 10 of the driving circuit and is used to output an auxiliary contact state adjustment signal to trigger the auxiliary contact A1 of the relay 100 to attract or disconnect.

[0071] It should be noted that the auxiliary contact state adjustment signal may include an auxiliary contact attracting signal and an auxiliary contact disconnecting signal. When the microcontroller unit 200 outputs an auxiliary contact attracting signal, it will trigger the auxiliary contact A1 of the relay 100 to attract; when the microcontroller unit 200 outputs an auxiliary contact disconnecting signal, it will trigger the auxiliary contact A1 of the relay 100 to disconnect.

[0072] In addition, it should be noted that the microcontroller unit (MCU) 200 can also be used to detect the working state of the relay 100.

[0073] In a feasible implementation, please refer to Figure 8 , the relay device may further include a power switch tube Q1; the drain of the power switch tube Q1 is connected to the coil of the relay 100, the gate of the power switch tube Q1 is connected to the microcontroller unit 200, and the source of the power switch tube Q1 is grounded to GND; the power switch tube Q1 is used to increase the magnitude of the driving current for driving the relay 100 to work.

[0074] It should be noted that the power switch tube Q1 can be a MOS tube, a triode, an IGBT (Insulated Gate Bipolar Transistor), or other types of field effect tubes, etc., and this embodiment does not make specific limitations on this.

[0075] In a feasible implementation, the relay device may further include a driving power supply, and the driving power supply is connected to the auxiliary contact A1 of the relay 100.

[0076] It should be noted that when the voltage value of the driving power supply connected to the auxiliary contact A1 of the relay 100 is relatively small, there is a risk that the relay 100 will not conduct. Therefore, to ensure that the relay 100 can conduct effectively, the voltage value of this driving power supply needs to be greater than 10 volts.

[0077] The relay device provided in this embodiment includes all the technical solutions of all the embodiments of the driving circuit of the above-mentioned relay, and the achieved technical effects are also exactly the same, so they will not be elaborated here.

[0078] The present utility model also provides an electronic device, which includes the relay 100 and the driving circuit of the above-mentioned relay. The driving circuit is connected to the auxiliary contact A1 of the relay 100; the structure of this driving circuit can refer to the above embodiments and will not be elaborated here.

[0079] It should be noted that this electronic device can be devices such as an inverter or a charging pile.

[0080] The electronic device provided in this embodiment includes all the technical solutions of all the embodiments of the driving circuit of the above-mentioned relay, and the achieved technical effects are also exactly the same, so they will not be elaborated here.

[0081] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A driving circuit for a relay, characterized in that, The driving circuit is connected to the auxiliary contact of the relay. The driving circuit includes: A voltage dividing module. The first end of the voltage dividing module is connected to the auxiliary contact, the second end of the voltage dividing module is grounded, and the voltage dividing module is used to provide a first current; A driving capacitor and a driving resistor. The first end of the driving capacitor is respectively connected to the auxiliary contact and the first end of the voltage dividing module. The second end of the driving capacitor is connected to the first end of the driving resistor, and the second end of the driving resistor is grounded. The driving capacitor and the driving resistor are used to form a second current at the moment when the auxiliary contact is attracted, so that the auxiliary contact is turned on under the combined action of the first current and the second current.

2. The drive circuit of the relay according to claim 1, characterized in that, The resistance value of the driving resistor is less than or equal to 1 kΩ.

3. The driving circuit of the relay according to claim 1, characterized in that, The capacitance of the driving capacitor is greater than or equal to 1 μF.

4. The drive circuit of the relay according to any one of claims 1 to 3, characterized in that, The voltage dividing module includes a first voltage dividing resistor and a second voltage dividing resistor; The first end of the first voltage dividing resistor is respectively connected to the auxiliary contact and the first end of the driving capacitor. The second end of the first voltage dividing resistor is connected to the first end of the second voltage dividing resistor, and the second end of the second voltage dividing resistor is grounded.

5. The drive circuit of the relay according to any one of claims 1 to 3, characterized in that In the case where the relay includes a plurality of the auxiliary contacts, the driving circuit further includes a switching module; The first end of the switching module is used to connect each of the auxiliary contacts, and the second end of the switching module is respectively connected to the first end of the driving capacitor and the first end of the voltage dividing module; The switching module is used to switch the auxiliary contact to be turned on.

6. A relay device, characterized in that, The relay device includes a relay and the driving circuit of the relay according to any one of claims 1 to 5, and the driving circuit is connected to the auxiliary contact of the relay.

7. The relay device according to claim 6, wherein, The relay device further includes a micro control unit and a power switch tube; The micro control unit is connected to the voltage dividing module of the driving circuit. The drain of the power switch tube is connected to the coil of the relay, the gate of the power switch tube is connected to the micro control unit, and the source of the power switch tube is grounded; The power switch tube is used to increase the magnitude of the driving current for driving the relay to work.

8. The relay device according to claim 6 or 7, characterized in that, The relay device further includes a driving power supply; The driving power supply is connected to the auxiliary contact of the relay.

9. The relay device according to claim 8, characterized in that, The voltage value of the driving power supply is greater than 10 V.

10. An electronic device, characterized in that, The electronic device includes a relay and the driving circuit of the relay according to any one of claims 1 to 5, and the driving circuit is connected to the auxiliary contact of the relay.

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