An electrical control system for bidirectional charging

Abstract

This utility model discloses an electrical control system for bidirectional charging, comprising: a first resistor module disposed within a discharge connector; a second resistor module disposed within a charging adapter; a charging gun, wherein a third resistor module, a CC line, a PE line, and a CP line are disposed within the charging gun; a first MCU control module disposed within the charging gun and electrically connected to the CC line, PE line, and CP line, for monitoring the equivalent resistance value between the CC line and the PE line and the PWM signal of the CP line; and a second MCU control module disposed within the new energy vehicle and communicatively connected to the first MCU control module; wherein the CC line and the PE line are electrically connected through the third resistor module, and the third resistor module is connected in parallel with either the first resistor module or the second resistor module to change the equivalent resistance value between the CC line and the PE line; the first MCU control module controls the transmission of the equivalent resistance value and / or the PWM signal to the second MCU control module to control the switching of charging or discharging modes.

Description

Technical Field

[0001] This utility model relates to the field of automotive charging and discharging technology, specifically an electrical control system for bidirectional charging. Background Technology

[0002] Currently, in bidirectional charging technology for new energy vehicles, traditional electrical control systems often employ separate resistor configurations and single communication links, leading to problems such as rigid resistor matching logic and insufficient communication linkage. Specifically, the resistor modules in the discharge connector and charging adapter can only transmit signals unidirectionally with the charging gun, lacking a bidirectional communication mechanism with the vehicle's MCU. For example, situations may arise where the charging gun is plugged into the vehicle but the discharge request is not recognized. Furthermore, when the charging gun is connected to the vehicle first and then the discharge connector, misalignment of the resistor signal timing may cause the risk of electric shock due to accidental discharge.

[0003] Therefore, designing an electrical control system for bidirectional charging that achieves dynamic adjustment of equivalent resistance through parallel connection of modular resistors and combines bidirectional communication with electrical protection via MCU has become a pressing technical problem to be solved in this field. Utility Model Content

[0004] The purpose of this utility model is to overcome the problems of traditional bidirectional charging electrical control systems, which mostly adopt separate resistor configurations and single communication link designs. These problems include inflexible resistor matching, inability to achieve effective bidirectional communication with the vehicle, and safety hazards such as accidental discharge caused by resistor signal timing errors. Consequently, these systems suffer from inconvenience, insufficient safety assurance, and high maintenance costs. This utility model provides a bidirectional charging electrical control system. The charging gun of this system is equipped with a first MCU control module, a third resistor module, a CC line, a PE line, and a CP line. The CC line and PE line are electrically connected through the third resistor module, and the CC line and PE line are electrically connected to the first MCU control module. At the same time, the CP line is also electrically connected to the first MCU control module. The discharge connector contains the first resistor module. The external energy storage device is a new energy vehicle. The vehicle's on-board end is equipped with a second MCU control module, the discharge connector contains the first resistor module, and the charging adapter contains the second resistor module.

[0005] When the charging gun is plugged into a new energy vehicle, the first MCU control module monitors the total resistance value between the CC line and the PE line and sends it to the second MCU control module. The second MCU control module then identifies that it is in a half-connected state where charging or discharging is not initiated, in accordance with the national standard (GB / T18487.1-2015) for charging and discharging communication and control logic. Next, after connecting the charging gun and the discharge connector, the first and third resistor modules are connected in parallel. At this time, the equivalent resistance value between the CC line and the PE line changes. The first MCU control module monitors the new equivalent resistance value and transmits it to the second MCU control module. The second MCU control module then identifies that it is in a discharging state and sends a signal to the first MCU control module. The first MCU control module sends a discharge permission signal. Upon receiving the discharge permission signal, the first MCU control module completes two-way authentication and then controls the vehicle battery to supply power to the discharge port. When the charging gun is not connected to the discharge port but to the charging adapter, the second and third resistor modules are connected in parallel. At this time, the equivalent resistance value between the CC line and the PE line changes again. The first MCU control module transmits the detected new equivalent resistance value and the PWM signal of the CP line to the second MCU control module. The second MCU control module then recognizes that it is currently in a charging state and sends a charging permission signal to the first MCU control module. Upon receiving the charging permission signal, the first MCU control module completes two-way authentication and then controls the charging of the vehicle battery.

[0006] This utility model provides a bidirectional charging electrical control system, comprising:

[0007] Discharge connector, with a first resistor module installed inside the discharge connector;

[0008] A charging adapter, with a second resistor module installed inside the charging adapter;

[0009] The charging gun contains a third resistor module, a CC circuit, a PE circuit, and a CP circuit.

[0010] The first MCU control module is configured inside the charging gun and is electrically connected to the CC line, PE line and CP line. It is used to monitor the equivalent resistance value between the CC line and PE line and the PWM signal of the CP line.

[0011] The CC line and PE line are electrically connected through a third resistor module, and the third resistor module is connected in parallel with the first resistor module or the second resistor module to change the equivalent resistance value between the CC line and the PE line. The first MCU control module controls the number of resistors in the third resistor module connected in parallel with the first resistor module or the second resistor module, and transmits the equivalent resistance value and / or PWM signal to the external energy storage device for discharging or charging.

[0012] Furthermore, the third resistor module includes an RC1 resistor and an RC4 resistor, wherein one end of the RC4 resistor is electrically connected to the CC line and the other end is electrically connected to the PE line, and the RC1 resistor and the RC4 resistor are connected in parallel.

[0013] Furthermore, a switch S4 is provided on the parallel line of resistors RC1 and RC4, and switch S4 is electrically connected to the first MCU control module.

[0014] Furthermore, the charging gun is equipped with an L line and an N line. A K1 relay is installed on the L line, and a K2 relay is installed on the N line. The L line, N line, K1 relay, and K2 relay are all electrically connected to the first MCU control module.

[0015] Furthermore, the charging gun is equipped with a bidirectional power supply. The input end of the bidirectional power supply is electrically connected to the L line and N line, and the output end is electrically connected to the K1 relay and K2 relay.

[0016] Furthermore, the first resistor module includes resistor RF1, resistor RF2, and a two-position switch S5, and the discharge connector is equipped with CC line and PE line.

[0017] Resistor RF1 is electrically connected to the PE line in the discharge connector, and resistor RF2 is electrically connected to the CC line in the discharge connector. Resistor RF1 is connected in series with resistor RF2 through a two-position switch S5.

[0018] Furthermore, the second resistor module includes an RF3 resistor, an RF4 resistor, and a two-position switch S6, and the charging adapter is equipped with a CC line and a PE line.

[0019] The RF3 resistor is electrically connected to the PE line inside the charging adapter, and the RF4 resistor is electrically connected to the CC line inside the charging adapter. The RF3 resistor is connected in series with the RF4 resistor through the two-position switch S6.

[0020] Furthermore, both double-position switches S5 and S6 are equipped with power buttons that trigger the switches to open and close.

[0021] Furthermore, a switch S1 is installed on the PE line, and the switch S1 is electrically connected to the first MCU control module.

[0022] Furthermore, a switch S3 is installed on the CC line, and the switch S3 is electrically connected to the first MCU control module.

[0023] In summary, this system, through its modular resistor and first MCU control module architecture, achieves intelligent switching of charging and discharging modes and bidirectional communication. Specifically, the system dynamically monitors the equivalent resistance value between the CC and PE lines and / or the PWM signal of the CP line via the first MCU control module, and works with external energy storage devices (i.e., new energy vehicles) to complete mode recognition and identity authentication, effectively solving the problems of rigid resistor matching and insufficient communication linkage in traditional systems. Furthermore, the system's built-in K1 / K2 relays and bidirectional power supply module form an electrical protection mechanism, avoiding the risk of accidental discharge caused by signal timing errors. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a circuit diagram of the system of this utility model when it is in discharge mode;

[0026] Figure 2 This is a circuit diagram of the system of this utility model when it is in charging mode. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of this utility model.

[0033] In the following description, suffixes such as "module," "part," "component," or "unit" are used only for the purpose of describing this utility model and have no specific meaning in themselves. Therefore, they can be used in combination.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] Please refer to the following: Figure 1 Here is a discharge flowchart of the system provided in this embodiment, and the specific process is as follows:

[0036] Step 1: Insert the charging gun into the vehicle (the vehicle has a second MCU control module, which is existing technology and will not be described in detail here).

[0037] In this step, since the initial state of switch S4 is open, the only effective resistance between the CC and PE lines is the RC4 resistor, which has a resistance of 3.5KΩ. The first MCU control module sends the monitored equivalent resistance value of 3.5KΩ to the second MCU control module. After receiving this equivalent resistance value, the second MCU control module identifies that it is currently in a semi-connected state where charging or discharging is not started. That is, the three-prong plug of the charging gun will not be energized, thus avoiding the risk of electric shock caused by the three-prong plug being energized before the discharge socket is inserted. This complies with the national standard (GB / T18487.1-2015) requirements for charging and discharging communication and control logic.

[0038] Step 2: Insert the three-prong plug of the charging gun into the discharge power strip and press the power button.

[0039] In this step, pressing the power button triggers the closure of the two-position switch S5. At this time, the resistor module consisting of resistors RF1 and RF2 is connected in parallel with the RC4 resistor module, where RF1 is 1.5KΩ and RF2 is 3.167KΩ. Therefore, the equivalent resistance between the CC line and the PE line is 2KΩ. The equivalent resistance value of 2KΩ detected by the first MCU control module is transmitted to the second MCU control module, which then recognizes that it is currently in a discharging state. The vehicle battery circuit is equipped with switch S2, which is initially open. After the second MCU control module recognizes that it is currently in a discharging state, it controls switch S2 to close and simultaneously sends a discharge permission signal to the first MCU control module. After receiving the discharge permission signal, the first MCU control module controls the closure of relays K1 and K2. At the same time, the bidirectional power supply starts the DC / AC inverter function, converting the DC power from the vehicle battery into 220V AC power, which is then output to the discharge connector via K1 / K2.

[0040] Step 3: Press the power button again or unplug the three-prong plug (discharge terminated).

[0041] In this step, the power button pops up, triggering the double-position switch S5 to open. Unplugging the three-prong plug disconnects the RF1 and RF2 resistors. At this time, the only effective resistance between the CC and PE lines is the RC4 resistor. When the first MCU control module detects an equivalent resistance value of 3.5KΩ, it controls relays K1 and K2 and switch S3 to open, stopping the bidirectional power supply from inverting. This ensures that even if the three-prong plug is unplugged from the discharge connector, it will not be energized, guaranteeing user safety. Simultaneously, the first MCU control module sends the detected equivalent resistance value of 3.5KΩ to the second MCU control module, which then controls switch S2 to open, terminating the power supply to the discharge connector.

[0042] Please refer to the following: Figure 2Here is a charging flowchart of the system provided in this embodiment, and the specific process is as follows:

[0043] Step 1: Insert the charging gun into the vehicle.

[0044] In this step, the initial state of switch S4 is open. At this time, the only effective resistance between the CC line and the PE line is the RC4 resistor, which has a resistance of 3.5KΩ. The first MCU control module detects the equivalent resistance value of 3.5KΩ and sends it to the second MCU control module. After receiving this value, the second MCU control module identifies and determines that it is currently in a half-connected state where charging or discharging is not started.

[0045] Step 2: Insert the three-prong plug of the charging gun into the charging adapter connected to the power grid (taking 16A as an example) and press the power button.

[0046] In this step, pressing the power button triggers the closure of the two-position switch S6. Simultaneously, after the three-prong plug is connected to the power grid, the first MCU control module detects the power signals on the L and N lines and then controls the RC1 resistor (0.844KΩ) switch S4 to close, and simultaneously controls the switch S1 to close. At this time, the effective resistance between the CC and PE lines is composed of resistors RF3, RF4, RC1, and RC4. Among them, the second resistor module, which is a series combination of resistors RF3 (0.68KΩ) and RF4 (0.164KΩ), is connected to the RC4 resistor. The resistors are connected in parallel, and resistors RC1 and RC4 are also connected in parallel. Therefore, the equivalent resistance between the CC and PE lines detected by the first MCU control module is 0.68KΩ. Simultaneously, the duty cycle of the PWM signal on the CP line is detected to be 75%. The equivalent resistance value and PWM signal detected by the first MCU control module are sent to the second MCU control module. After parsing the PWM signal and equivalent resistance value, the second MCU control module identifies the current charging state as 16A and controls switch S2 to close, simultaneously sending a charging permission signal to the first MCU control module. After receiving the signal and completing two-way authentication, the first MCU control module controls the closure of relays K1 and K2. Simultaneously, the bidirectional power supply initiates the AC / DC conversion function, allowing the AC power from the grid to charge the vehicle battery after rectification.

[0047] Step 3: Press the power button again or unplug the three-prong plug (charging ends).

[0048] In this step, the power button pops up, triggering the two-position switch S6 to open. The three-prong plug is unplugged, disconnecting resistors RF3 and RF4. At this time, the first MCU control module detects the change in electrical signals on the L and N lines and then controls switches S4 and S1 to open. As a result, the only effective resistance between the CC and PE lines is resistor RC4. When the first MCU control module detects an equivalent resistance value of 3.5KΩ, it controls relays K1 and K2 to open, stopping the bidirectional power supply from inverting. Simultaneously, the first MCU control module sends the detected equivalent resistance value of 3.5KΩ to the second MCU control module. The second MCU control module controls switch S2 to open, terminating the supply of power to the vehicle battery, and the charging process ends.

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An electrical control system for bidirectional charging, characterized in that, include: A discharge connector, wherein a first resistor module is provided inside the discharge connector; A charging adapter, wherein a second resistor module is provided inside the charging adapter; A charging gun, wherein a third resistor module, a CC line, a PE line and a CP line are provided inside the charging gun; The first MCU control module is configured inside the charging gun and is electrically connected to the CC line, PE line and CP line to monitor the equivalent resistance value between the CC line and PE line and the PWM signal of the CP line. The CC line and PE line are electrically connected through a third resistor module, and the third resistor module is connected in parallel with the first resistor module or the second resistor module to change the equivalent resistance value between the CC line and the PE line. The first MCU control module controls the number of resistors in the third resistor module connected in parallel with the first resistor module or the second resistor module, and transmits the equivalent resistance value and / or PWM signal to an external energy storage device for discharging or charging.

2. The bidirectional charging electrical control system according to claim 1, characterized in that, The third resistor module includes an RC1 resistor and an RC4 resistor. One end of the RC4 resistor is electrically connected to the CC line, and the other end is electrically connected to the PE line. The RC1 resistor and the RC4 resistor are connected in parallel.

3. The bidirectional charging electrical control system according to claim 2, characterized in that, A switch S4 is provided on the parallel line of the RC1 resistor and the RC4 resistor, and the switch S4 is electrically connected to the first MCU control module.

4. The bidirectional charging electrical control system according to claim 3, characterized in that, The charging gun is also equipped with an L line and an N line. A K1 relay is installed on the L line and a K2 relay is installed on the N line. The L line, N line, K1 relay, and K2 relay are all electrically connected to the first MCU control module.

5. The bidirectional charging electrical control system according to claim 4, characterized in that, The charging gun is also equipped with a bidirectional power supply. The input end of the bidirectional power supply is electrically connected to the L line and N line, and the output end is electrically connected to the K1 relay and K2 relay.

6. The bidirectional charging electrical control system according to claim 1, characterized in that, The first resistor module includes resistor RF1, resistor RF2 and a two-position switch S5, and the discharge connector is provided with CC line and PE line; The RF1 resistor is electrically connected to the PE line in the discharge connector, and the RF2 resistor is electrically connected to the CC line in the discharge connector. The RF1 resistor is connected in series with the RF2 resistor through a two-position switch S5.

7. The bidirectional charging electrical control system according to claim 6, characterized in that, The second resistor module includes an RF3 resistor, an RF4 resistor, and a two-position switch S6. The charging adapter is equipped with a CC line and a PE line. The RF3 resistor is electrically connected to the PE line inside the charging adapter, and the RF4 resistor is electrically connected to the CC line inside the charging adapter. The RF3 resistor is connected in series with the RF4 resistor through a two-position switch S6.

8. The bidirectional charging electrical control system according to claim 7, characterized in that, Both the two-position switches S5 and S6 are equipped with power buttons that trigger the switches to open and close.

9. The bidirectional charging electrical control system according to claim 1, characterized in that, A switch S1 is provided on the CP line, and the switch S1 is electrically connected to the first MCU control module.

10. The bidirectional charging electrical control system according to claim 1, characterized in that, A switch S3 is provided on the CC line, and the switch S3 is electrically connected to the first MCU control module.

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