A three-in-one charging pile intelligent charging and discharging switching and mode recognition circuit structure and method

Abstract

This invention discloses a three-in-one charging pile intelligent charging / discharging switching and mode recognition circuit structure and method. The circuit structure includes an intelligent charging / discharging switching circuit and a mode recognition circuit. When the charging pile is not powered, it functions as a discharging device; when powered, it functions as a charging device. Furthermore, after power is supplied, the charging pile automatically identifies either mode two or mode three charging mode, and the circuit breaker (CP) sends a corresponding charging signal based on the mode recognition result. This invention integrates mode two charging, mode three charging, and discharging functions into a single charging pile, breaking through the limitations of traditional single-function devices. The coordinated implementation of these three functions allows a single device to adapt to different charging scenarios and energy interaction needs, significantly improving the compatibility of charging pile products with vehicles, power grids, and user usage scenarios.

Description

Technical Field

[0001] This invention relates to the field of intelligent charging and discharging switching and pattern recognition technology for charging piles, and particularly to a circuit structure and method for intelligent charging and discharging switching and pattern recognition of a three-in-one charging pile. Background Technology

[0002] With the popularization of new energy vehicles, charging infrastructure, as a key supporting component, has developed rapidly. Its technical performance and functional diversity directly affect user experience and market application efficiency. Currently, new energy vehicle charging is mainly divided into different modes according to international standards. Among them, Mode 2 (portable charging, connecting to the vehicle's onboard charger via a household socket, typically with lower power) and Mode 3 (dedicated charging piles, connecting to the vehicle via AC charging piles, with higher power) are the mainstream charging methods. Meanwhile, with the development of technologies such as vehicle-to-grid (V2G), the demand for vehicles to discharge to the power grid or external devices is becoming increasingly prominent. The current technological status of the charging equipment field is as follows:

[0003] 1) Limited Functionality: Traditional AC charging piles often focus on a single mode (e.g., only supporting Mode 3) or only have charging functionality, lacking compatibility with discharging. Users needing to simultaneously meet Mode 2 charging, Mode 3 fast charging, and discharging requirements must purchase multiple devices, increasing operating costs and space requirements. 2) Limitations of Integrated Charger / Discharge Devices: Some existing integrated chargers only support Mode 2 charging and basic discharging. Due to hardware design limitations, their charging power is low (typically ≤3.3kW), failing to meet users' demands for high-power charging and lacking compatibility with Mode 3. 3) Insufficient Mode Compatibility: Mode 3 charging piles, due to hardware interface limitations, are incompatible with Mode 2 plugs, requiring fixed installation in dedicated locations (e.g., charging stations). This restricts their flexibility for home or portable use, limiting the expansion of application scenarios.

[0004] For example, invention application number 202110220523.7 discloses a charging circuit structure for a three-in-one charging pile. While this solution addresses the problems of low charging efficiency and high labor or hardware costs associated with charging low-voltage lithium batteries in electric vehicles when they are depleted, it also suffers from limitations: its functional design is relatively restrictive, focusing only on optimizing the charging circuit and neglecting the discharge function and compatibility with multiple charging modes. Although this invention improves charging efficiency in specific situations, it fails to meet users' diverse needs for integrated charging and discharging and multi-mode compatibility.

[0005] Therefore, the aforementioned situation has led to problems in the charging equipment market, such as fragmented functions, low resource utilization, and disjointed user experience, making it difficult to adapt to the diverse charging and discharging needs of new energy vehicles and the trend towards "one-stop" services. Consequently, the development of integrated equipment with multi-mode compatibility and intelligent charging / discharging switching capabilities has become an important development direction in the charging equipment field. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a three-in-one charging pile intelligent charging and discharging switching and pattern recognition circuit structure and method, thereby solving the problems of limited functionality, low resource utilization, and poor user experience of existing charging equipment.

[0007] The objective of this invention can be achieved through the following technical solution: a circuit structure and method for intelligent charging and discharging switching and pattern recognition of a three-in-one charging pile.

[0008] First aspect: A circuit structure for intelligent charging / discharging switching and mode recognition of a three-in-one charging pile, including:

[0009] Intelligent charging / discharging switching circuit, used to automatically switch the charging pile to be used as a discharging device or a charging device;

[0010] The pattern recognition circuit is used to automatically identify mode two or mode three for charging when the charging pile is used as a charging device.

[0011] As a further embodiment of the present invention, the intelligent charging / discharging switching circuit includes a relay, a discharging CC resistor, and a charging CC resistor, wherein the relay switch is a single-pole double-throw switch.

[0012] When the charging pile is not powered, the relay switch is connected to the discharge CC resistor, and the charging pile is used as a discharge device; when the charging pile is powered, the relay switch is connected to the charging CC resistor, and the charging pile is used as a charging device.

[0013] As a further embodiment of the present invention, the following is stated:

[0014] When the charging station is not powered, the relay switch is connected to the normally closed switch and the discharge CC resistor by default.

[0015] After the charging station is powered on, the relay switch automatically switches to the charging CC resistor.

[0016] As a further embodiment of the present invention, the relay includes a relay coil:

[0017] After the charging pile is powered, the relay coil is powered, and the relay switch is connected to the charging CC resistor.

[0018] As a further embodiment of the present invention, the intelligent charging / discharging switching circuit structure includes:

[0019] Relay circuit: One end of the relay coil is connected to a +12V power supply and the other end is connected to PE ground. One end of the relay switch K1 is connected to the charging pile CC and the other end is connected to the discharge CC resistor or the charging CC resistor.

[0020] Discharge CC resistor circuit: One end of RC' is connected to one end of resistor R4' and switch S3', and the other end of R4' is connected to the other end of S3 and then to PE ground;

[0021] Charging CC resistor circuit: One end of RC is connected to one end of resistor R4 and the third end of switch S3, the other end of R4 is connected to the second end of S3 and connected to PE ground, and the first end of S3 is connected to BT.

[0022] As a further embodiment of the present invention, the pattern recognition circuit includes a charging pile terminal, a mode two plug terminal, and a mode three plug terminal, wherein...

[0023] When the charging pile is used as a charging device, the charging pile terminal automatically identifies the internal identification resistor of the Mode 2 plug terminal or the Mode 3 plug terminal. Based on the identification result, the charging pile terminal CP sends the duty cycle signal corresponding to the Mode 2 or Mode 3 charging current during charging.

[0024] As a further embodiment of the present invention, the pattern recognition circuit structure includes:

[0025] At the charging pile end, one end of resistor R4 is connected to the AD acquisition signal ADC_SW, the other end of R4 is connected to one end of resistor R3 and one end of capacitor C1, and the plug end of mode two or mode three. The other end of R3 is connected to VCC3V3 power supply, and the other end of C1 is connected to PE ground.

[0026] For the second mode plug, one end of resistor R1 is connected to PE ground, and the other end of resistor R1 is connected to the charging pile end according to the identification.

[0027] For the Mode 3 plug, one end of resistor R2 is connected to PE ground, and the other end of resistor R2 is connected to the charging pile end according to the identification.

[0028] Second aspect: A method for intelligent charging / discharging switching and mode recognition of a three-in-one charging pile, the method comprising:

[0029] When the charging pile is not powered, it is used as a discharge device; after the charging pile is powered, it is used as a charging device. After the charging pile is powered, it automatically identifies the charging mode 2 or 3, and the CP sends the corresponding charging signal during charging according to the mode identification result.

[0030] A three-in-one charging pile, wherein the charging pile uses the circuit structure described in the first aspect.

[0031] As a further embodiment of the present invention, the charging pile is detachably installed.

[0032] The beneficial effects of this invention are:

[0033] 1. This invention integrates the charging and discharging functions of Mode 2 and Mode 3 into the same charging pile through hardware circuit design (single-pole double-throw relay switching charging / discharging CC circuit and identification resistor distinguishing Mode 2 / 3), breaking through the limitation of the single function of traditional equipment. The coordinated realization of the three functions enables a single device to adapt to different charging scenarios and energy interaction needs, significantly improving the compatibility of charging pile products with vehicles, power grids and user usage scenarios.

[0034] 2. The integrated design of this invention eliminates the fragmentation of charging in Mode 2 requiring dedicated equipment, fast charging in Mode 3 requiring separate purchase, and discharging requiring additional devices, thus enriching the usage of charging piles (such as using Mode 3 for high-power home charging, using Mode 2 for flexible charging when going out, and discharging for outdoor power needs); at the same time, users do not need to repeatedly purchase equipment for multiple functions, directly reducing equipment purchase, installation and maintenance costs, and improving convenience and economy of use.

[0035] 3. This invention avoids the duplication of production and deployment of similar equipment through functional integration, reduces redundant investment of social resources, and improves resource utilization efficiency. In addition, the multi-functional integrated charging pile of this invention can cover a wider range of application scenarios, accelerate the popularization of charging infrastructure, and provide hardware support for the coordinated development of the new energy vehicle industry chain. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the intelligent charging and discharging switching circuit structure of the charging pile of the present invention;

[0037] Figure 2 This is a schematic diagram of the pattern recognition circuit structure of the present invention. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] Existing charging equipment suffers from problems such as limited functionality, supporting only a single mode or charging only, requiring users to purchase multiple devices, increasing costs and space usage, incompatibility between mode 3 and mode 2, and restrictions on installation and use.

[0040] To address the above-mentioned problems, this invention discloses a circuit structure and method for intelligent charging and discharging switching and pattern recognition of a three-in-one charging pile.

[0041] Example 1:

[0042] This embodiment discloses a circuit structure for intelligent charging and discharging switching and mode recognition of a three-in-one charging pile, such as... Figure 1As shown, it includes a smart charging and discharging switching circuit for the charging pile. Relying on the smart charging and discharging switching circuit, the charging pile can be automatically switched to be used as a discharging device or a charging device.

[0043] The intelligent charging and discharging switching circuit of the charging pile mainly consists of three parts: a relay, a discharging CC resistor, and a charging CC resistor, wherein the relay switch is a single-pole double-throw switch.

[0044] When the charging pile is not powered, the relay switch is connected to the discharge CC resistor, and the charging pile is used as a discharge device; when the charging pile is powered, the relay switch is connected to the charging CC resistor, and the charging pile is used as a charging device.

[0045] The above structure enables intelligent charging and discharging switching of the charging pile, improving equipment utilization and flexibility. When the charging pile is not powered, a relay switch connects the circuit to the discharging CC resistor, allowing the charging pile to be used as a discharging device. When the charging pile is powered, the relay switch automatically switches to the charging CC resistor, restoring the charging pile's charging function and providing power to electric vehicles or other charging devices. This design not only solves the problem of limited functionality in existing charging equipment but also avoids the need for users to purchase multiple devices, reducing operating costs and space requirements.

[0046] Preferred, such as Figure 1 As shown, the intelligent charging / discharging switching circuit structure includes: a relay circuit, a discharging CC resistor circuit, and a charging CC resistor circuit, wherein:

[0047] Relay circuit: One end of the relay coil is connected to a +12V power supply and the other end is connected to PE ground. One end of the relay switch K1 is connected to the charging pile CC and the other end is connected to the discharge CC resistor or the charging CC resistor.

[0048] Discharge CC resistor circuit: One end of RC' is connected to one end of resistor R4' and switch S3', and the other end of R4' is connected to the other end of S3 and then to PE ground;

[0049] Charging CC resistor circuit: One end of RC is connected to one end of resistor R4 and the third end of switch S3, the other end of R4 is connected to the second end of S3 and connected to PE ground, and the first end of S3 is connected to BT.

[0050] In the above structure, RC, R4, and S3 constitute the charging CC resistor, RC', R4', and S3' constitute the discharging CC resistor, and K1 is a single-pole double-throw relay switch.

[0051] Preferably, when the charging pile is not powered, the relay switch K1 is connected to the normally closed circuit and the discharge CC resistor by default, and can be used as a discharge device at this time; after the charging pile is powered, the relay coil of the relay switch K1 is powered, and the relay switch is connected to the charging CC resistor, and can be used as a charging device at this time; thus realizing the automatic charging and discharging switching function.

[0052] Preferably, the circuit of the present invention can also realize a dynamic switching triggering mechanism, with vehicle demand as the priority response logic. When the charging pile is charging, if the vehicle BMS sends a discharge request through the CAN bus (such as detecting that the battery SOC≥90% and the power grid needs peak regulation), the charging pile MCU can control the relay K1 to switch to the discharge CC circuit (briefly cut off the power grid to trigger the switch, and restore the power supply after the switch is completed but maintain the discharge mode), realize the active switching discharge function in the charging state, and realize dynamic switching triggering.

[0053] Preferably, an interlocking circuit (e.g., composed of two diodes D1 and D2 connected in reverse parallel) is added between the charging CC resistor and the discharging CC resistor. When the relay switch K1 is switched, the diodes ensure that the charging or discharging circuits will not be turned on at the same time, avoiding signal disturbance caused by resistor circuit conflict. At the same time, an absorption circuit can be connected in parallel across the relay contacts to reduce arc interference during switching and extend the relay life.

[0054] Example 2:

[0055] Based on Embodiment 1, this embodiment discloses a circuit structure for intelligent charging and discharging switching and pattern recognition of a three-in-one charging pile, such as... Figure 2 As shown, it also includes a pattern recognition circuit. Relying on the pattern recognition circuit, when the charging pile is used as a charging device, it can automatically identify mode two or mode three for charging.

[0056] When the charging pile is used as a charging device, it automatically identifies the internal identification resistor of the mode 2 plug or the mode 3 plug. Based on the identification result, the charging pile CP sends the duty cycle signal corresponding to the mode 2 or mode 3 charging current during charging.

[0057] The above structure enables the charging pile to recognize charging patterns. During charging, when the charging pile recognizes a Mode 2 plug, the charging pile terminal CP sends a duty cycle signal corresponding to the Mode 2 charging current, controlling the charging pile to charge with the current that Mode 2 can handle; when the charging pile recognizes a Mode 3 plug, the charging pile terminal CP sends a duty cycle signal corresponding to the Mode 3 charging current, controlling the charging pile to charge with the current that Mode 3 can handle.

[0058] Preferably, such as Figure 2 As shown, the pattern recognition circuit structure includes: a charging pile terminal, a mode 2 plug terminal, and a mode 3 plug terminal circuit, specifically:

[0059] The charging pile terminal includes resistor R4. One end of resistor R4 is connected to the AD acquisition signal ADC_SW. The other end of R4 is connected to one end of resistor R3 and one end of capacitor C1, as well as the mode 2 plug terminal or mode 3 plug terminal. The other end of R3 is connected to VCC3V3 power supply, and the other end of C1 is connected to PE ground.

[0060] The plug terminal of Mode 2 includes a resistor R1. One end of resistor R1 is connected to the PE ground, and the other end of resistor R1 is connected to the charging pile terminal according to the identification.

[0061] The plug terminal of Mode 3 includes resistor R2. One end of resistor R2 is connected to PE ground, and the other end of resistor R2 is connected to the charging pile terminal according to the identification.

[0062] In the above structure, R1 is the internal identification resistor of the mode 2 plug, R2 is the internal identification resistor of the mode 3 plug, and R3 is the resistor that divides the voltage with R1 or R2.

[0063] When the charging pile is used as a charging device, if resistor R1 is detected, the CP will send a mode two charging current duty cycle signal during charging. If resistor R2 is detected, the CP will send a mode three charging current duty cycle signal during charging, thus realizing the intelligent identification function between mode two and mode three.

[0064] Preferably, the circuit structure of the present invention can realize wide-range adaptive resistance identification. Based on the identification of resistor R1 (mode 2) and R2 (mode 3), a dynamic calibration algorithm for resistance value is added. When the charging pile MCU samples through the ADC, it first collects the real-time voltage of VCC3V3 (to eliminate the influence of power fluctuations), and then calculates the actual value of the plug resistance by combining the voltage divider formula (instead of judging by a fixed threshold).

[0065] For example, when the detected resistance value is in the range of 200-240Ω, it is automatically determined to be in mode two (compatible plug resistance tolerance ±10%); when the detected resistance value is in the range of 135-165Ω, it is determined to be in mode three (compatible plug resistance tolerance ±10%), thus improving compatibility with plugs from different brands.

[0066] Preferably, the user's mode preference is recorded by the built-in storage module (EEPROM). If a plug (uniquely identified by its resistance value) is detected to have been used in mode two charging three times in a row, it will automatically prioritize mode two the next time it is plugged in. If the same vehicle uses the charging and discharging function alternately, its charging and discharging time pattern is recorded (e.g., discharging at 8 pm and charging at 7 am). The user is reminded by an indicator light before the expiration date, which improves the convenience of use.

[0067] Example 3:

[0068] Based on the circuit structures of Embodiments 1 and 2, this embodiment also discloses a method for intelligent charging and discharging switching and pattern recognition circuitry of a three-in-one charging pile, including:

[0069] When the charging pile is not powered, it is used as a discharge device; after the charging pile is powered, it is used as a charging device. After the charging pile is powered, it automatically identifies the charging mode 2 or 3, and the CP sends the corresponding charging signal during charging according to the mode identification result.

[0070] Using the above method, the charging pile can automatically identify the charging and discharging switching required by the vehicle without manual selection, which greatly improves the convenience and efficiency of charging. At the same time, when charging, the charging pile can charge the vehicle in both mode two and mode three, realizing flexible energy allocation.

[0071] This invention integrates charging / discharging switching and pattern recognition into a single charging pile, improving product compatibility; enriching the ways to use the charging pile and reducing usage costs; and by integrating market resources, reducing redundant equipment investment, improving resource utilization efficiency, and promoting the popularization and application of charging facilities.

[0072] Example 4:

[0073] This embodiment also discloses a three-in-one charging pile, which is detachable and has flexible application methods.

[0074] When the charging pile is not powered, it can be used as a discharge device; when the charging pile is powered, it can be used as a charging device; and when the charging pile is used as a charging device, it automatically identifies the charging mode 2 or 3, and the CP sends the corresponding charging signal during charging according to the mode identification result.

[0075] For example, in a home setting, when a high-power fast charge is needed for a new energy vehicle, the user can connect the detachable charging station to a dedicated power supply line. The charging station will then automatically switch to Mode 3 charging mode. After plugging in a charging plug compatible with Mode 3, the charging station can quickly identify and output a high-power current to meet the vehicle's need for a large amount of power replenishment in a short time, allowing users to enjoy efficient charging services at home.

[0076] For example, when users need to go out, such as for a short trip or a short commute requiring temporary charging, they can carry the detachable charging station with them. Simply replace the charging plug with the Mode 2 plug, and the charging station will automatically recognize and switch to Mode 2 charging mode. In this mode, the charging station can charge the vehicle using ordinary power sources such as household outlets. Even in places without dedicated charging stations, such as friends' homes or roadside shops with ordinary outlets, the vehicle can be flexibly charged, solving users' charging concerns when traveling.

[0077] For example, in outdoor power usage scenarios such as camping or outdoor work, users can switch the charging station to discharge mode. In this mode, the charging station can release the electrical energy stored in the vehicle's battery to power various outdoor devices, such as camping lights, small refrigerators, and laptops. This not only meets the user's outdoor power needs but also makes full use of the vehicle's battery energy, achieving flexible energy utilization and making outdoor life and work more convenient and comfortable.

[0078] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0079] Furthermore, the terms “one end” and “the other end” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to electrical connection; they can refer to being able to communicate with each other or being indirectly connected through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A three-in-one charging pile intelligent charging / discharging switching and pattern recognition circuit structure, characterized in that, include: Intelligent charging / discharging switching circuit, used to automatically switch the charging pile to be used as a discharging device or a charging device; The pattern recognition circuit is used to automatically identify mode two or mode three for charging when the charging pile is used as a charging device. The intelligent charging / discharging switching circuit includes a relay, a discharging CC resistor, and a charging CC resistor, wherein the relay switch is a single-pole double-throw switch. When the charging station is not powered, the relay switch is connected to the discharge CC resistor, and the charging station is used as a discharge device at this time. After the charging pile is powered on, the relay switch is connected to the charging CC resistor, at which point the charging pile is used as a charging device. When the charging station is not powered, the relay switch is connected to the normally closed switch and the discharge CC resistor by default. After the charging pile is powered on, the relay switch automatically switches to the charging CC resistor; The relay includes a relay coil: After the charging pile is powered, the relay coil is powered, and the relay switch is connected to the charging CC resistor; The intelligent charging / discharging switching circuit structure includes: Relay circuit: One end of the relay coil is connected to a +12V power supply and the other end is connected to PE ground. One end of the relay switch K1 is connected to the charging pile CC and the other end is connected to the discharge CC resistor or the charging CC resistor. Discharge CC resistor circuit: One end of RC' is connected to one end of resistor R4' and switch S3', and the other end of R4' is connected to the other end of S3 and then to PE ground; Charging CC resistor circuit: One end of RC is connected to one end of resistor R4 and the 3rd terminal of switch S3, the other end of R4 is connected to the 2nd terminal of S3 and connected to PE ground, and the 1st terminal of S3 is connected to BT. The pattern recognition circuit includes a charging pile terminal, a mode 2 plug terminal, and a mode 3 plug terminal, wherein... When the charging pile is used as a charging device, the charging pile terminal automatically identifies the internal identification resistor of the mode 2 plug terminal or the mode 3 plug terminal. Based on the identification result, the charging pile terminal CP sends a duty cycle signal corresponding to the mode 2 or mode 3 charging current during charging. The pattern recognition circuit structure includes: At the charging pile end, one end of resistor R4 is connected to the AD acquisition signal ADC_SW, the other end of R4 is connected to one end of resistor R3 and one end of capacitor C1, and the plug end of mode two or mode three. The other end of R3 is connected to VCC3V3 power supply, and the other end of C1 is connected to PE ground. For the second mode plug, one end of resistor R1 is connected to PE ground, and the other end of resistor R1 is connected to the charging pile end according to the identification. For the Mode 3 plug, one end of resistor R2 is connected to PE ground, and the other end of resistor R2 is connected to the charging pile end according to the identification.

2. A method for intelligent charging / discharging switching and pattern recognition of a three-in-one charging pile applied to the circuit structure described in claim 1, characterized in that, The method includes: When the charging pile is not powered, it is used as a discharge device; after the charging pile is powered, it is used as a charging device. After the charging pile is powered, it automatically identifies the charging mode 2 or 3, and the CP sends the corresponding charging signal during charging according to the mode identification result.

3. A three-in-one charging post, characterized in that, The charging pile uses the circuit structure described in claim 1.

4. The charging post of claim 3, wherein, The charging pile is detachable.

Images