Relay special for charging pile

Abstract

The invention relates to a special relay for a charging pile, which comprises a seat body, a relay part is arranged on the seat body, the relay part controls the on-off of a large-current / high-voltage circuit by using a small current / signal through an electromagnetic effect, and a connecting piece is further arranged on the seat body. The relay part is composed of a first coil, an armature, a reset spring and a contact, and the first coil generates a magnetic field after being powered on. According to the relay special for the charging pile, the relay function, current collection, leakage current collection, contact adhesion detection, output short circuit detection and other functions are integrated, the complexity and the size of a system are reduced, space integration is carried out through reasonable structural design, circuit design of a user is facilitated, and the reliability of the system is improved through integration of multiple detection functions. The operation state of the system can be monitored and diagnosed in real time, faults can be found and processed in time, the overall reliability of the system is improved, and due to the reasonable external interface design, equipment can be easily integrated with other systems.

Description

Technical Field

[0001] This invention relates to the field of relay technology, specifically to a relay for charging piles. Background Technology

[0002] In existing electrical control systems, relays are typically used to control the switching on and off of high-current or high-voltage circuits. However, traditional relay devices have shortcomings in terms of functional integration, reliability, and ease of installation.

[0003] For example, traditionally, relays, leakage current sensors, current sensors, contact adhesion detection, and short circuit detection are used as separate modules to achieve functions such as current acquisition, leakage current detection, contact adhesion detection, and output short circuit detection. This method is bulky, costly, and the high current requirements for circuit design are not conducive to circuit design. This not only increases the complexity of the system but also reduces the reliability and installation efficiency of the system. Therefore, a special relay for charging piles is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dedicated relay for charging piles. It effectively reduces costs while also facilitating circuit design by bringing out the output signal pins from appropriate locations, thus solving the problems mentioned in the background.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a special relay for charging piles, including a base, wherein a relay part is provided on the base, and the relay part realizes the switching on and off of a large current / high voltage circuit by using a small current / signal through electromagnetic effect; the base is also provided with a connector. The relay consists of a first coil, an armature, a return spring, and contacts. The first coil generates a magnetic field when energized, which is the core element for triggering the action. The armature is a metal component that can be attracted by the magnetic field of the first coil and is fixedly connected to the moving contact. When the first coil is de-energized, the return spring can pull the armature back to its initial position.

[0006] Furthermore, the connector comprises a current acquisition section, a leakage current acquisition section, a contact adhesion detection section, an output short circuit detection section, and a signal output section.

[0007] Furthermore, the current acquisition section comprises a magnetic core and a second coil.

[0008] Furthermore, the magnetic core adopts a silicon steel sheet stacked structure to reduce eddy current losses at power frequency.

[0009] Furthermore, the second coil is made of enameled wire wound on a magnetic core, which senses the magnetic field of the magnetic core and outputs a low current proportional to the primary current, and outputs the signal through the pin.

[0010] Furthermore, the leakage current acquisition section comprises a magnetic core coil and a detection circuit board.

[0011] Furthermore, the magnetic core coil is composed of an enameled coil with a specified number of turns wound around a nanocrystalline magnetic ring, which can accurately capture the weak magnetic field generated by leakage current and prevent the signal from being masked by loss.

[0012] Furthermore, the detection circuit board supplies a constant current to the magnetic core coil to calculate the saturation time. After internal calculation of the leakage current, it outputs a signal according to the corresponding protection time.

[0013] Furthermore, the contact adhesion detection section, the output short circuit detection section, and the signal output section are all located on one side of the base.

[0014] Furthermore, the current acquisition section converts the large current on the primary side into a small current on the secondary side based on the law of electromagnetic induction, and achieves electrical isolation, providing a safe and accurate signal for the measurement and protection system.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects: This dedicated relay for charging piles integrates relay functions with multiple functions such as current acquisition, leakage current acquisition, contact adhesion detection, and output short circuit detection, reducing system complexity and size. Through rational structural design and space integration, it effectively reduces costs while also facilitating circuit design by bringing the output signal pins out from appropriate locations. By integrating multiple detection functions, it can monitor and diagnose the system's operating status in real time, promptly detect and handle faults, and improve overall system reliability. The rational external interface design makes the device easy to integrate with other systems, reducing installation difficulty and improving installation efficiency. The current acquisition section achieves electrical isolation through the law of electromagnetic induction, providing safe and accurate signals for the measurement and protection system. The leakage current acquisition section can accurately capture the weak magnetic field generated by leakage current, promptly detecting leakage current faults and avoiding safety accidents caused by leakage current. High integration and high reliability reduce system failure points and lower maintenance costs. Simultaneously, multiple detection functions can promptly detect potential problems, facilitating early maintenance and further extending the equipment's lifespan. The device is suitable for various electrical control systems and can meet the needs of different application scenarios. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the relay part of the present invention; Figure 3 This is a schematic diagram of the current acquisition part of the present invention.

[0017] Figure 4 This is a schematic diagram of the leakage current acquisition part of the present invention.

[0018] In the diagram: 1. Base, 2. Relay section, 201. First coil, 202. Armature, 203. Reset spring, 204. Contact, 3. Current acquisition section, 301. Magnetic core, 302. Second coil, 4. Leakage current acquisition section, 401. Magnetic core coil, 402. Detection circuit board, 5. Contact adhesion detection section, 6. Output short circuit detection section, 7. Signal output section. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 4 The charging pile-specific relay in this embodiment includes a base 1, on which a relay part 2 is provided. The relay part 2 realizes the switching on and off of a large current / high voltage circuit by using a small current / signal through electromagnetic effect. A connector is also provided on the base 1.

[0021] In this embodiment, the relay part 2 includes a first coil 201, an armature 202, a return spring 203, and a contact 204. The first coil 201 generates a magnetic field after being energized, which is the core element for triggering the action. The armature 202 is a metal component that can be attracted by the magnetic field of the first coil 201 and is fixedly connected to the moving contact 204. When the first coil 201 is de-energized, the return spring 203 can pull the armature 202 back to its initial position.

[0022] In this embodiment, the connector comprises a current acquisition section 3, a leakage current acquisition section 4, a contact adhesion detection section 5, an output short circuit detection section 6, and a signal output section 7. The current acquisition section 3 comprises a magnetic core 301 and a second coil 302. The contact adhesion detection section 5, the output short circuit detection section 6, and the signal output section 7 are all located on one side of the base 1. The current acquisition section 3 converts the large current on the primary side into a small current on the secondary side based on the law of electromagnetic induction and achieves electrical isolation, providing a safe and accurate signal for the measurement and protection system.

[0023] It should be noted that the magnetic core 301 adopts a silicon steel sheet laminated structure to reduce eddy current losses at power frequency. The second coil 302 is made of enameled wire wound on the magnetic core 301 to sense the magnetic core magnetic field and output a low current proportional to the primary current. The signal is output through the pin. The leakage current acquisition section 4 consists of a magnetic core coil 401 and a detection circuit board 402. The magnetic core coil 401 is composed of an enameled coil with a specified number of turns wound with nanocrystalline magnetic wire, which can accurately capture the weak magnetic field generated by the leakage current and avoid the signal being masked by loss. The detection circuit board 402 passes a constant current to the magnetic core coil 401 to calculate the saturation time. After the leakage current is calculated internally, the signal is output according to the corresponding protection time. The leakage current acquisition section 4 generates a square wave through the oscillation circuit and passes it through the detection coil. The operational amplifier calculates the inductor saturation time based on the feedback waveform. When leakage current occurs in the device, the inductor saturation time will change according to the magnetic similarity principle. The actual leakage current is calculated based on the change time.

[0024] Understandably, integrating relay functions with multiple functions such as current acquisition, leakage current acquisition, contact adhesion detection, and output short circuit detection reduces system complexity and size. Through rational structural design and space integration, costs are effectively reduced. Furthermore, output signal pins are brought out from appropriate locations based on common design principles, facilitating circuit design for users. By integrating multiple detection functions, the system's operating status can be monitored and diagnosed in real time, allowing for timely fault detection and handling, thus improving overall system reliability. A well-designed external interface makes the device easy to integrate with other systems, reducing installation difficulty and improving installation efficiency.

[0025] It is understandable that during the switching process, the relay contacts may melt due to high temperature, metal diffusion, or mechanical jamming, causing them to fail to separate properly when disconnecting, ultimately resulting in the controlled circuit continuing to conduct or failing. The contact adhesion detection section 5 converts the high-voltage AC to low-voltage AC through a resistor between the relay input and output terminals, and amplifies the voltage difference between the input and output through an operational amplifier. When contact 204 is stuck, the output voltage is equal to the input voltage, and the voltage output after the operational amplifier will be relatively low. When contact 204 is not stuck, the output voltage is significantly lower than the input voltage, and the voltage output after the operational amplifier will be relatively high. The output short circuit detection section 6 introduces a 5V DC voltage to one end of the output terminal while ensuring that the relay is disconnected, and then collects the voltage at the other end of the output. When a short circuit fault occurs, a 5V voltage can be collected at the other end of the output; when no short circuit fault occurs, only a 0V voltage can be collected. The signal output section 7 follows conventional circuit design practices, with a reasonable distribution of output pins to reduce the difficulty of circuit design and ensure that the signal can be accurately and reliably output to other systems.

[0026] The working principle of the above embodiments is as follows: (1) When the first coil 201 is energized, it generates a magnetic field, attracting the armature 202 and causing the moving contact to close with the stationary contact, thereby controlling the opening and closing of a high-current or high-voltage circuit. The armature 202 is attracted by the magnetic field of the first coil 201 and is fixedly connected to the moving contact 204, thus closing the contact 204. When the first coil 201 is de-energized, the magnetic field disappears, and the return spring 203 pulls the armature 202 back to its initial position, causing the contact 204 to open. The contact 204 acts as a switch for the controlled circuit, controlling the opening and closing of the circuit. The magnetic core 301 adopts a silicon steel sheet laminated structure to reduce eddy current losses at power frequency. The second coil 302 is made of enameled wire wound on a magnetic core. It senses the magnetic core's magnetic field and outputs a low current proportional to the primary current. The signal is output through the pin. The magnetic core coil 401 uses nanocrystalline magnetic wire to wind an enameled coil with a specified number of turns. It can accurately capture the weak magnetic field generated by leakage current and avoid the signal being masked by loss. The detection circuit board 402 passes a constant current to the magnetic core coil 401. A square wave is generated by the oscillation circuit. After passing through the detection coil, the inductor saturation time is calculated by the operational amplifier based on the feedback waveform. When leakage current occurs in the device, the inductor saturation time will change. The actual leakage current is calculated based on the change in time.

[0027] (2) The contact sticking detection section 5 converts the high voltage AC to low voltage AC through a resistor between the input and output terminals of the relay. The voltage difference between the input and output is amplified by an operational amplifier. When the contact 204 sticks, the output voltage is equal to the input voltage. The voltage output after the operational amplifier will be relatively low. When the contact 204 does not stick, the output voltage is significantly less than the input voltage. At this time, the voltage output after the operational amplifier will be relatively high. The output short circuit detection section 6 introduces a 5V DC voltage to one end of the output terminal while ensuring that the relay is open. Then, the voltage of the other end of the output is collected. When a short circuit fault occurs, the other end of the output can collect a 5V voltage. If no short circuit fault occurs, only a 0V voltage can be collected. The signal output section 7 follows the conventional circuit design habits. The output pins are reasonably distributed to reduce the difficulty of circuit design and ensure that the signal can be accurately and reliably output to other systems.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover 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 limitations, 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.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A charging pile dedicated relay comprising a seat body (1), characterized in that: The relay part (2) is arranged on the seat body (1), and realizes the on-off of a large current / high voltage circuit controlled by a small current / signal through electromagnetic effect. The relay part (2) comprises a first coil (201), an armature (202), a reset spring (203) and a contact (204), the first coil (201) generates a magnetic field after being electrified, and is a core element of triggering action, the armature (202) is a metal member that can be attracted by the magnetic field of the first coil (201), and is fixedly connected with the movable contact (204), and the reset spring (203) can pull the armature (202) back to the initial position when the first coil (201) is de-energized.

2. The charging pile special-purpose relay according to claim 1, characterized in that: The connecting piece comprises a current collection part (3), a leakage current collection part (4), a contact adhesion detection part (5), an output short circuit detection part (6) and a signal output part (7).

3. The charging pile special-purpose relay according to claim 1, characterized in that: The current collection part (3) comprises a magnetic core (301) and a second coil (302).

4. The charging pile special-purpose relay according to claim 3, characterized in that: The magnetic core (301) adopts a silicon steel sheet lamination structure to reduce eddy current loss under power frequency.

5. The charging pile special-purpose relay according to claim 3, characterized in that: The second coil (302) is wound on the magnetic core (301) by using enameled wire, senses the magnetic field of the magnetic core, outputs a low current proportional to the primary current, and outputs the signal through a pin.

6. The charging pile special-purpose relay according to claim 2, characterized in that: The leakage current collection part (4) comprises a magnetic core coil (401) and a detection circuit board (402).

7. The charging pile special-purpose relay according to claim 6, characterized in that: The magnetic core coil (401) is composed of a specified number of turns of enameled wire wound on a nanocrystalline magnetic ring, can accurately capture the weak magnetic field generated by the leakage current, and avoids the signal being covered by loss.

8. The charging pile special-purpose relay according to claim 6, characterized in that: The detection circuit board (402) inputs a constant current into the magnetic core coil (401) to calculate the saturation time, calculates the leakage current through internal operation, and outputs the signal according to the corresponding protection time.

9. The charging pile special-purpose relay according to claim 2, characterized in that: The contact adhesion detection part (5), the output short circuit detection part (6) and the signal output part (7) are all located on one side of the seat body (1).

10. The charging pile special-purpose relay according to claim 1, characterized in that: The current collection part (3) converts the large current on the primary side into a small current on the secondary side in proportion based on the law of electromagnetic induction, realizes electrical isolation, and provides safe and accurate signals for the measurement and protection system.

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