LOAD AND UNLOAD CONTROL DEVICE

Abstract

This disclosure provides a loading and unloading control system comprising a loading control box and a loading gun. The loading control box includes a control module, a communication module, a loading port, a discharging port, and a first controllable switching circuit. The loading gun includes a loading resistor, a discharging resistor, and a second controllable switching circuit.The control module is connected by signal to the first controllable switching circuit, the second controllable switching circuit, and the communication module. The control module is configured to, in a state where the charging port is connected to the mains electricity and based on battery status information from the electric car, control the first controllable switching circuit to switch to the charging port, and control the second controllable switching circuit to switch to the charging resistor, so that a charging loop is formed to allow the charging gun to output a voltage or current suitable for an electric car battery.The charge and discharge control system in this disclosure can charge the electric car and also allows the electric car to supply power to an electrical device, meeting the charge and discharge requirements for the electric car in different scenarios.

Description

A charging and discharging control system

[0001] This article claims priority to the Chinese patent application number 202122966236.9 filed on November 30, 2021, with the utility model name “A charging and discharging control system”. All contents of the patent are incorporated herein in their entirety. Technical Field

[0002] This article relates to the technical field of new energy electric vehicles, and in particular to a charge and discharge control system. Background Art

[0003] With the rapid development of the automotive industry and the increasing awareness of environmental protection, the development of the new energy vehicle industry has become a key point in solving the shortage of oil resources and reducing air pollution. The supporting charging pile is also an essential equipment.

[0004] Charging piles can be installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential parking lots or charging stations. They can charge various models of electric vehicles according to different voltage levels. The input end of the charging pile is directly connected to the AC power grid, and the output end is equipped with a charging plug for charging electric vehicles. In the event of an emergency such as a grid power outage or power outage, existing charging piles will be unusable. As mobile distributed energy storage devices, electric vehicles are numerous and store a considerable amount of electrical energy. Therefore, effectively utilizing the electrical energy in idle electric vehicles is a current problem that needs to be solved.

[0005] Summary of the Invention

[0006] In order to solve the above technical problems, this article provides a charge and discharge control system, including:

[0007] A charging control box, comprising a control module, a communication module, a charging port, a discharging port, and a first controllable switch circuit, wherein the first controllable switch circuit is used to switch between the charging port and the discharging port, the charging port is used to access the power grid, the discharging port is used to connect to an external power device, and the communication module is used to achieve communication between the control module and the electric vehicle;

[0008] A charging gun, comprising a charging resistor, a discharging resistor, and a second controllable switching circuit, wherein the second controllable switching circuit is configured to switch between the charging resistor and the discharging resistor;

[0009] The control module is signal-connected to the first controllable switch circuit, the second controllable switch circuit, and the communication module, and the control module is configured as follows:

[0010] When the charging port is connected to the power grid, and based on the battery status information of the electric vehicle, the first controllable switch circuit is controlled to switch to connect the charging port, and the second controllable switch circuit is controlled to switch to connect the charging resistor, thereby forming a charging circuit and causing the charging gun to output an AC voltage or current that matches the battery of the electric vehicle.

[0011] The charge and discharge control system provided in this article can realize the charging of electric vehicles and the reverse power supply of electric vehicles to electrical equipment, meeting the charging and discharging needs of electric vehicles in different occasions.

[0012] In order to make the above and other purposes, features and advantages of this article more obvious and easy to understand, the following specifically cites preferred embodiments and provides detailed descriptions in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of this article or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of this article. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] FIG1 shows a charge and discharge control system according to a first embodiment of the present invention;

[0015] FIG2 shows a charge and discharge control system according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of this document. Obviously, the embodiments described are only part of the embodiments of this document, not all of the embodiments. Based on the embodiments of this document, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this document.

[0017] It should be noted that the terms "first," "second," and the like in the specification and claims herein and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or devices.

[0018] Example 1

[0019] 1 , this embodiment provides a charge and discharge control system 100 , preferably an AC one, including a charge control box and a charge gun.

[0020] Specifically, the charging control box includes a control module (which can be configured as an MCU, Micro Control Unit), a communication module (not shown in the figure, it can be understood that the communication module can be a GPRS communication module or a WIFI module or a Bluetooth module, where the GPRS module communication module can be a 4G module or a 5G module), a charging port, a discharge port and a first controllable switch circuit. The first controllable switch circuit is used to realize switching between the charging port and the discharge port. The charging port is used to access the power grid, and the discharge port is used to connect to external electrical equipment. The communication module is used to realize the communication connection between the control module and the electric vehicle.

[0021] The charging gun includes a charging resistor R1, a discharging resistor R2 and a second controllable switch circuit. The second controllable switch circuit is used to realize switching between the charging resistor R1 and the discharging resistor R2.

[0022] The control module is signal-connected to the first controllable switch circuit, the second controllable switch circuit, and the communication module. The control module is configured as follows:

[0023] When the charging port is connected to the power grid, and based on the battery status information of the electric vehicle, the first controllable switch circuit is controlled to switch to connect the charging port, and the second controllable switch circuit is controlled to switch to connect the charging resistor R1, thereby forming a charging circuit and making the charging gun output an AC voltage or current that matches the battery of the electric vehicle.

[0024] Furthermore, the control module can also be configured to: when the charging port is not connected to the power grid and the external electrical equipment is connected to the discharge port, and according to the battery status information, control the first controllable switch circuit to switch to connect the discharge port, and control the second controllable switch circuit to switch to connect the discharge resistor R2, thereby forming a discharge loop, so that the charging gun outputs AC power that matches the power grid.

[0025] Therefore, according to the charge and discharge control system of this embodiment, by controlling the first controllable switch circuit and the second controllable switch circuit by the control module, it is possible to realize the charging process of the electric vehicle with the AC power of the grid and the reverse power supply process of the electric vehicle to the electrical equipment, thereby meeting the charging and discharging needs of the electric vehicle in different occasions.

[0026] Specifically, referring to FIG1 , the first controllable switch circuit may include a first solid-state switch U1, a second solid-state switch U2, a third solid-state switch U3, and a fourth solid-state switch U4. It will be appreciated that, in this embodiment, the solid-state switches may be configured as solid-state relays. In other embodiments, the solid-state switches in the first controllable switch circuit may also be replaced with thyristor switching devices, etc., to achieve similar functions, depending on the actual circuit configuration requirements. This document does not limit this.

[0027] The first solid-state switch U1 is connected between the live wire L of the charging gun and the neutral wire N of the discharge port; the second solid-state switch U2 is connected between the neutral wire N of the charging gun and the live wire L of the discharge port; the third solid-state switch U3 is connected between the neutral wire N of the charging gun and the neutral wire N of the charging port; the fourth solid-state switch U4 is connected between the live wire L of the charging gun and the live wire L of the charging port.

[0028] More specifically, the second controllable switch circuit may include a first transistor Q1 and a second transistor Q2. The base of the first transistor Q1 is connected to the battery management system of the electric vehicle, the collector of the first transistor Q1 is connected to a charging resistor R1, the other end of which is connected to a supply voltage, and the emitter of the first transistor Q1 is connected to the ground of the charging gun. The base of the second transistor Q2 is connected to the battery management system of the electric vehicle, the collector of the second transistor Q2 is connected to a discharge resistor R2, and the emitter of the second transistor Q2 is connected to the ground of the charging gun.

[0029] Therefore, when the charging port is connected to the power grid and the charging gun has not yet been connected to the electric vehicle, the AC / DC power supply module is powered on and operates, outputting energy to the guidance module, control module, controllable switch detection module, leakage detection module, voltage / current detection module (refer to Figure 2), etc., and each module is working in place.

[0030] Afterwards, since the charging port is connected to the power grid, the control module detects the connection of the AC mains, the first transistor Q1 of the charging gun is turned on, and the charging resistor R1 is connected to the charging circuit, waiting for charging.

[0031] Before the charging process, the guidance module must be controlled to detect whether the electric vehicle needs to be charged. If charging is required, the leakage detection module is controlled to determine whether there is a leakage abnormality. If there is no abnormality, the control module waits for the charging gun to be inserted into the electric vehicle; the charging gun is connected to the charging port of the electric vehicle, and the guidance module can detect the charging status and connection status. If there is no abnormality, the guidance module notifies the control module that the charging preparation work is completed and charging can be carried out; then the control module allows the controllable switch detection module to turn on the third solid-state switch U3 and the fourth solid-state switch U4, thereby forming a charging circuit and performing the charging process.

[0032] Of course, it is understandable that if an abnormality occurs during the leakage detection process, an alarm can be issued through the prompt module, and the control module can initiate emergency measures and not allow charging.

[0033] During the discharge process, since the charging port is not connected to the power grid, the charging port changes from being powered on to being powered off, and the AC / DC power module is powered off. The charging control box can be powered by the backup battery, and the first transistor Q1 is disconnected, the second transistor Q2 is turned on, and the discharge resistor R2 is connected to wait for discharge. It can be understood that the backup battery is electrically connected to the control module and is used to power the control module when the charging port is not connected to the power grid. During the charging process, the powered AC / DC power module can charge the backup battery, so when the AC / DC power module is powered off, it can be powered by the backup battery.

[0034] More specifically, before discharging, the control guidance module detects whether the electric vehicle has discharge capabilities. If so, the control module allows the controllable switch detection module to connect the first solid-state switch U1 and the second solid-state switch U2, forming a discharge circuit for discharge. After discharging to a predetermined amount of power, the first solid-state switch U1 and the second solid-state switch U2 are controlled to disconnect.

[0035] Preferably, a charging selection button K1 and a discharging selection button K2 may also be provided on the outside of the charging control box. The charging selection button K1 and the discharging selection button K2 are connected to a control module, and the control module is configured to control the switching of the first controllable switch circuit and the second controllable switch circuit according to the triggering of the charging selection button K1 and the discharging selection button K2.

[0036] It can be understood that there is no need for a control module to detect whether the grid is connected to the charging port and whether the electric vehicle is connected to the discharging port. The charging mode or the discharging mode can be selected manually, thereby improving the charging and discharging efficiency.

[0037] Example 2

[0038] 2 , the charge-discharge control system 200 provided in this embodiment differs from the charge-discharge control system 100 of Example 1 only in the specific configurations of the first controllable switch circuit and the second controllable switch circuit. For the sake of brevity, this embodiment only describes the distinguishing technical features in detail.

[0039] Specifically, as shown in Figure 2, the first controllable switch circuit includes a first mechanical switch K4 and a second mechanical switch K5. The moving contact of the first mechanical switch K4 is connected to the neutral line N of the charging gun, the normally closed contact of the first mechanical switch K4 is connected to the neutral line N of the discharge port, and the normally open contact of the first mechanical switch K4 is connected to the neutral line N of the charging port; the moving contact of the second mechanical switch K5 is connected to the live wire L of the charging gun, the normally closed contact of the second mechanical switch K5 is connected to the live wire L of the discharge port, and the normally open contact of the second mechanical switch K5 is connected to the live wire L of the charging port.

[0040] Correspondingly, the second controllable switch circuit includes a third mechanical switch K3, the moving contact of the third mechanical switch K3 is connected to the battery management system of the electric vehicle, the normally closed contact of the third mechanical switch K3 is connected to the discharge resistor R2, and the normally open contact of the third mechanical switch K3 is connected to the charging resistor R1.

[0041] It can be understood that the mechanical switch in this embodiment can be configured as a mechanical relay switch.

[0042] Therefore, when the charging port is connected to the power grid and the charging gun has not yet been connected to the electric vehicle, the AC / DC power supply module is powered and starts to work, outputting energy to the guidance module, control module, controllable switch detection module, leakage detection module, voltage / current detection module, etc., and each module is working in place.

[0043] Afterwards, the third mechanical switch K3 is switched to the charging resistor R1 at the fastest speed, and the charging resistor R1 is connected to the charging circuit and waits for charging.

[0044] Before charging begins, the control guidance module must detect whether the electric vehicle needs to be charged. If so, the leakage detection module is controlled to determine whether there is a leakage anomaly. If not, the control module waits for the charging gun to be inserted into the electric vehicle. The charging gun is connected to the charging port of the electric vehicle, and the guidance module can detect the charging status and connection status. If there is no anomaly, the guidance module notifies the control module that the charging preparation is complete and charging can be performed. The control module then allows the controllable switch detection module to control the first mechanical switch K4 and the second mechanical switch K5 to be closed. At this time, the first mechanical switch K4 and the second mechanical switch K5 are connected to the charging port, thereby forming a charging circuit and the charging process. It can be understood that the first mechanical switch K4 and the second mechanical switch K5 are connected to the discharge port by default, so they need to be closed and switched during the charging process.

[0045] Of course, it is understandable that if an abnormality occurs during the leakage detection process, an alarm can be issued through the prompt module, and the control module can initiate emergency measures and not allow charging.

[0046] During the discharge process, since the charging port is not connected to the power grid, the charging port changes from being powered on to being powered off, and the AC / DC power supply module is powered off. Therefore, various modules such as the control module do not work, and the first mechanical switch K4, the second mechanical switch K5, and the third mechanical switch K3 are all turned off, that is, the default state is restored. In this state, the first mechanical switch K4 and the second mechanical switch K5 are connected to the discharge port, and the third mechanical switch K3 is connected to the discharge resistor R2 to form a discharge circuit for discharge.

[0047] More specifically, before the discharge process is performed, the guidance module can be controlled to detect whether the electric vehicle has the discharge capability, and only if it has the capability will the discharge be performed.

[0048] It can also be understood that as long as the charging port is not powered, the AC / DC power supply module is not powered, the controllable switch detection module is not powered, the first mechanical switch K4, the second mechanical switch K5 and the third mechanical switch K3 are not energized, that is, they are in the default state, the discharge port is connected to the electric vehicle discharge device, and the electric vehicle can output 220V AC power to the outside.

[0049] According to the charge and discharge control system of each embodiment of this document, it is possible to charge the electric vehicle and also to reversely supply power to electrical equipment from the electric vehicle, thus meeting the charging and discharging requirements of the electric vehicle in different situations.

[0050] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the field of the invention. The terms used herein are for the purpose of describing specific implementations only and are not intended to limit the invention. Terms such as "component" and the like appearing herein may refer to either a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing herein may refer to either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0051] The present invention has been described through the above embodiments, but it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. It will be understood by those skilled in the art that many more variations and modifications can be made based on the teachings of this invention, and these variations and modifications all fall within the scope of protection claimed herein.

Claims

1. A charge and discharge control system, characterized in that: include: A charging control box, comprising a control module, a communication module, a charging port, a discharging port, and a first controllable switch circuit, wherein the first controllable switch circuit is used to switch between the charging port and the discharging port, the charging port is used to access the power grid, the discharging port is used to connect to an external power device, and the communication module is used to achieve communication between the control module and the electric vehicle; A charging gun, comprising a charging resistor, a discharging resistor, and a second controllable switching circuit, wherein the second controllable switching circuit is configured to switch between the charging resistor and the discharging resistor; The control module is signal-connected to the first controllable switch circuit, the second controllable switch circuit, and the communication module, and the control module is configured as follows: When the charging port is connected to the power grid, and based on the battery status information of the electric vehicle, the first controllable switch circuit is controlled to switch to connect the charging port, and the second controllable switch circuit is controlled to switch to connect the charging resistor, thereby forming a charging circuit and causing the charging gun to output an AC voltage or current that matches the battery of the electric vehicle.

2. The charge and discharge control system according to claim 1, wherein: The control module is further configured to: When the charging port is not connected to the power grid and the external electrical device is connected to the discharge port, and based on the battery status information, the first controllable switch circuit is controlled to switch to connect the discharge port, and the second controllable switch circuit is controlled to switch to connect the discharge resistor, thereby forming a discharge loop and allowing the charging gun to output AC power that matches the power grid.

3. The charge and discharge control system according to claim 2, wherein: The first controllable switch circuit includes a first mechanical switch and a second mechanical switch, wherein the movable contact of the first mechanical switch is connected to the neutral line of the charging gun, the normally closed contact of the first mechanical switch is connected to the neutral line of the discharge port, and the normally open contact of the first mechanical switch is connected to the neutral line of the charging port; The movable contact of the second mechanical switch is connected to the live wire of the charging gun, the normally closed contact of the second mechanical switch is connected to the live wire of the discharge port, and the normally open contact of the second mechanical switch is connected to the live wire of the charging port.

4. The charge and discharge control system according to claim 2, wherein: The first controllable switch circuit includes a first solid-state switch, a second solid-state switch, a third solid-state switch and a fourth solid-state switch, The first solid-state switch is connected between the live wire of the charging gun and the neutral wire of the discharge port; The second solid-state switch is connected between the neutral wire of the charging gun and the live wire of the discharge port; The third solid-state switch is connected between the neutral line of the charging gun and the neutral line of the charging port; The fourth solid-state switch is connected between the live wire of the charging gun and the live wire of the charging port.

5. The charge and discharge control system according to claim 2, wherein: The second controllable switch circuit includes a third mechanical switch, the moving contact of the third mechanical switch is connected to the battery management system of the electric vehicle, the normally closed contact of the third mechanical switch is connected to the discharge resistor, and the normally open contact of the third mechanical switch is connected to the charging resistor.

6. The charge and discharge control system according to claim 2, wherein: The second controllable switch circuit includes a first triode and a second triode; The base of the first transistor is used to connect to the battery management system of the electric vehicle, the collector of the first transistor is connected to the charging resistor, the other end of the charging resistor is connected to the power supply voltage, and the emitter of the first transistor is connected to the ground wire of the charging gun; The base of the second transistor is used to connect to the battery management system of the electric vehicle, the collector of the second transistor is connected to the discharge resistor, and the emitter of the second transistor is connected to the ground wire of the charging gun.

7. The charge and discharge control system according to claim 1, wherein: The charging control box also includes an AC / DC power supply module, which is connected to the input end of the control module and is used to supply power to the control module when the charging port is connected to the power grid.

8. The charge and discharge control system according to claim 1, wherein: A charging selection button and a discharging selection button are also provided on the outside of the charging control box. The charging selection button and the discharging selection button are connected to the control module. The control module is configured to control the switching of the first controllable switch circuit and the second controllable switch circuit according to the triggering of the charging selection button and the discharging selection button.

9. The charge and discharge control system according to claim 1, wherein: The charging control box is further provided with a backup battery, which is electrically connected to the control module and is used to supply power to the control module when the charging port is not connected to the power grid.

10. The charge and discharge control system according to claim 1, wherein: The communication module adopts any one of a 5G module, a 4G module, a WIFI module and a Bluetooth module.

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