A charge and discharge control guide circuit

Abstract

The present application discloses a charge and discharge control guide circuit, which relates to the field of electric vehicle charge and discharge technology. The circuit includes: an AC power line L, a neutral line N and a ground line PE connecting a power supply device and a bidirectional on-board charger, and a charge and discharge connection confirmation line CC and a control confirmation line CP connecting a power supply control device and a vehicle control device; the power supply device is also provided with a switch S3, a resistor RC and a switch S5 connected in series between PE and CC in sequence, and a resistor R4 connected in parallel to both ends of the switch S3, and a switch S6 and a power supply are provided on CC between the power supply control device and the first connection point, and the first connection point is the connection point between the switch S5 and CC; the electric vehicle is also provided with a switch S4 and a power supply, one end of the switch S4 is connected to CC, and the other end is connected to the power supply. The present application can realize the automatic charging and discharging function of the electric vehicle and improve the user experience.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicle charging and discharging, and in particular to a charging and discharging control guide circuit. Background Art

[0002] When an electric vehicle is equipped with a bidirectional on-board charger (OBC), the electric vehicle has charging and discharging functions. When the electric vehicle is discharging, it can be used as a home energy storage device to power household appliances. On the one hand, the charging gun can be plugged into the AC charging port of the electric vehicle, and the 220-volt AC voltage is converted into the battery voltage through the bidirectional OBC to charge the vehicle; on the other hand, the discharge gun can be plugged into the AC charging port of the electric vehicle, and the battery voltage is converted into 220-volt AC voltage through the bidirectional OBC to power household appliances.

[0003] However, the related technology requires manual operation to switch the insertion of the charging gun and the discharging gun to realize the charging and discharging function of the electric vehicle. This function is inconvenient to use and leads to a poor user experience. Summary of the invention

[0004] In response to the above technical problems, an embodiment of the present application provides a charge and discharge control guidance circuit, which can realize the automatic charging and discharging function of an electric vehicle and improve the user experience.

[0005] The technical solution of this application is implemented as follows:

[0006] The present application provides a charge and discharge control guidance circuit, which is used to form a charge and discharge loop between a power supply device and an electric vehicle, wherein the power supply device is provided with a power supply control device, and the electric vehicle is provided with a bidirectional on-board charger and a vehicle control device; the charge and discharge control guidance circuit includes:

[0007] An AC power line L, a neutral line N and a ground line PE connecting the power supply device and the bidirectional on-board charger, and a charge and discharge connection confirmation line CC and a control confirmation line CP connecting the power supply control device and the vehicle control device;

[0008] The power supply device is further provided with a switch S3, a resistor RC and a switch S5 which are sequentially connected in series between the ground line PE and the charge-discharge connection confirmation line CC, and a resistor R4 which is connected in parallel to both ends of the switch S3, and a switch S6 and a power supply are provided on the charge-discharge connection confirmation line CC between the power supply control device and the first connection point, and the first connection point is the connection point between the switch S5 and the charge-discharge connection confirmation line CC;

[0009] The electric vehicle is also provided with a switch S4 and a power supply. One end of the switch S4 is connected to the charge and discharge connection confirmation line CC, and the other end is connected to the power supply.

[0010] In some embodiments, the power supply device is further provided with a grid interface, an electrical appliance interface, a contactor K3 and a contactor K4;

[0011] The grid interface is connected to the electrical appliance interface through the contactor K3 and the contactor K4 respectively, and the connection point between the contactor K3 and the electrical appliance interface is connected to the AC power line L, and the connection point between the contactor K4 and the electrical appliance interface is connected to the neutral line N.

[0012] In some embodiments, the power supply device is further provided with a contactor K1 and a contactor K2;

[0013] One end of the contactor K1 is connected to the second connection point, and the other end is connected to the AC power line L. The second connection point is the connection point between the contactor K3 and the electrical appliance interface;

[0014] One end of the contactor K2 is connected to the third connection point, and the other end is connected to the neutral line N. The third connection point is the connection point between the contactor K4 and the electrical appliance interface.

[0015] In some embodiments, the power supply control device is used to: upon receiving a charging request, control the contactor K1, the contactor K2, the contactor K3, the contactor K4, the switch S3 and the switch S5 in the power supply device to close, and control the switch S6 to open;

[0016] The vehicle control device is used to control the switch S4 in the electric vehicle to be disconnected when a charging request is received.

[0017] In some embodiments, the power supply control device is further used to: upon receiving a discharge request, control the contactor K1, the contactor K2 and the switch S6 in the power supply device to close, and control the contactor K3, the contactor K4, the switch S3 and the switch S5 to open;

[0018] The vehicle control device is further configured to control the switch S4 in the electric vehicle to close when a discharge request is received.

[0019] In some embodiments, the power supply device is connected to the vehicle socket of the electric vehicle via a vehicle plug, and the vehicle socket is provided in the vehicle interface of the electric vehicle;

[0020] The AC power line L, the neutral line N and the ground line PE are respectively connected to the power supply device, the vehicle interface and the bidirectional vehicle charger in sequence;

[0021] The charge-discharge connection confirmation line CC and the control confirmation line CP are respectively connected to the power supply control device, the vehicle interface and the vehicle control device in sequence.

[0022] In some embodiments, a switch S7 is provided in the vehicle plug, and both ends of the switch S7 are connected to the power supply control device;

[0023] The power supply control device is further configured to: upon receiving the charging request, control the closing and opening of the switch S3 based on the closing and opening of the switch S7.

[0024] In some embodiments, the power supply device is further provided with a switch S1 and a resistor R1;

[0025] The switch S1 includes a first end and a second end, and the resistor R1 includes a third end and a fourth end;

[0026] The first end is connected to an output interface of a pulse width modulation (PWM) wave on the power supply control device, the second end is connected to the third end, and the fourth end is connected to the control confirmation line CP.

[0027] In some embodiments, the electric vehicle is further provided with a diode D1, a resistor R2, a resistor R3 and a switch S2;

[0028] The control confirmation line CP is connected to the vehicle control device through the diode D1;

[0029] The resistor R2 and the switch S2 are connected in series between a fourth connection point and a fifth connection point, the fourth connection point is a connection point between the diode D1 and the vehicle control device, and the fifth connection point is a connection point between the bidirectional on-board charger and the ground line PE;

[0030] The resistor R3 is connected in parallel to both ends of the resistor R2 and the switch S2.

[0031] In some embodiments, the control confirmation line CP is used to: realize communication between the power supply device and the electric vehicle based on a power line carrier communication PLC signal.

[0032] The charge and discharge control guidance circuit provided in the embodiment of the present application can form a charging circuit between the power supply device and the electric vehicle by arranging a switch S3, a resistor RC and a switch S5 which are sequentially connected in series between the ground line PE and the charge and discharge connection confirmation line CC, and a resistor R4 connected in parallel to both ends of the switch S3 in the power supply device, and by arranging a switch S6 and a power supply on the charge and discharge connection confirmation line CC connected to the power supply control device in the power supply device, and arranging a switch S4 and a power supply on the charge and discharge connection confirmation line CC connected to the vehicle control device in the electric vehicle, so that a discharge circuit can be formed between the power supply device and the electric vehicle, thereby realizing automatic switching between the charging circuit and the discharging circuit based on the control functions of the power supply control device in the power supply device and the vehicle control device in the electric vehicle, and realizing the automatic charging and discharging function of the electric vehicle without manually switching the insertion of the charging gun and the discharging gun, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A structural schematic diagram of an AC charging control guide circuit provided for related technologies;

[0035] Figure 2 A schematic diagram of the structure of a charge and discharge control guide circuit provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of the structure of a PLC carrier communication circuit provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of a charging and discharging process provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] It should be noted that in the description of the embodiments of the present application, the terms "first", "second", etc. are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0040] In order to facilitate a clearer understanding of the embodiments of the present application, some related technologies are first introduced as follows.

[0041] The AC charging in the related technology complies with the charging requirements of GBT 27930-2015. Figure 1 A schematic diagram of the structure of an AC charging control guide circuit provided for related technologies, such as Figure 1 As shown, the circuit reserves the power line communication (PLC) function with a 5% duty cycle of the pulse width modulation (PWM) wave of the control pilot function (CP) signal. The European charging standard ISO15118-3 supports the CP signal PLC carrier communication function. When the PWM wave duty cycle is 5%, the signal is coupled, and the PLC signal is loaded and received to realize two-way communication between electric vehicles and charging piles.

[0042] However, if Figure 1 The AC charging control guide circuit shown can only realize the charging function of the electric vehicle, but does not have the function of discharging the electric vehicle as an energy storage device. Moreover, although the related art adopts a bidirectional OBC to realize the charging and discharging function of the electric vehicle, manual operation is required to switch the insertion of the charging gun and the discharging gun during the charging and discharging process to realize the charging and discharging function of the electric vehicle. For example, when the power grid price is low, the charging gun is inserted and the vehicle is charged; when the power grid price is high or the power grid is out of power, the charging gun is unplugged and the discharging gun is reinserted to power household appliances. This manual operation method is inconvenient to use, resulting in a poor user experience. Moreover, when the discharge gun is inserted to power household appliances, an independent power distribution device is required to power the home, which adds additional costs.

[0043] In order to improve at least some of the above-mentioned defects existing in the related art, an embodiment of the present application provides a charge and discharge control guidance circuit, which can realize the automatic charging and discharging function of an electric vehicle and improve the user experience.

[0044] The following is an exemplary introduction to the charge and discharge control guidance circuit provided in the embodiment of the present application in conjunction with the drawings in the embodiment of the present application.

[0045] Figure 2 A schematic diagram of the structure of a charge and discharge control guidance circuit provided in an embodiment of the present application, wherein the charge and discharge control guidance circuit is used to form a charge and discharge loop between a power supply device and an electric vehicle, the power supply device is provided with a power supply control device, and the electric vehicle is provided with a bidirectional on-board charger and a vehicle control device; Figure 2 As shown, the charge and discharge control guide circuit includes:

[0046] An AC power line L, a neutral line N and a ground line PE connecting the power supply device and the bidirectional on-board charger, and a charge and discharge connection confirmation line CC and a control confirmation line CP connecting the power supply control device and the vehicle control device;

[0047] The power supply device is further provided with a switch S3, a resistor RC and a switch S5 which are sequentially connected in series between the ground line PE and the charge-discharge connection confirmation line CC, and a resistor R4 which is connected in parallel to both ends of the switch S3, and a switch S6 and a power supply are provided on the charge-discharge connection confirmation line CC between the power supply control device and the first connection point, and the first connection point is the connection point between the switch S5 and the charge-discharge connection confirmation line CC;

[0048] The electric vehicle is also provided with a switch S4 and a power supply. One end of the switch S4 is connected to the charge and discharge connection confirmation line CC, and the other end is connected to the power supply.

[0049] It should be noted that the power supply device in the embodiment of the present application can be a charging pile, which is compatible with the existing standard vehicle charging interface, and the electric vehicle can be charged with the existing standard charging pile.

[0050] In some embodiments, the AC power line L may be a three-phase line including an AC power line L1 , an AC power line L2 , and an AC power line L3 .

[0051] In some embodiments, the power supply provided in the power supply device may be a 12 volt power supply for supplying power to the power supply device.

[0052] In some embodiments, the power supply provided in the electric vehicle may be a 12-volt power supply, which may be a power battery of the electric vehicle or other power supply that can provide electrical energy to the electric vehicle, and this embodiment of the present application does not specifically limit this.

[0053] In some embodiments, the power supply control device in the power supply device can control the on and off of each switch and each contactor provided in the power supply device.

[0054] In some embodiments, the vehicle control device in the electric vehicle can control the on and off of each switch and each contactor provided in the electric vehicle.

[0055] In some embodiments, the switches S3 and S5 in the power supply device can be controlled to be closed, the switch S6 can be controlled to be opened, and the switch S4 in the electric vehicle can be controlled to be opened, so that a charging loop can be formed between the power supply device and the electric vehicle.

[0056] In some embodiments, when a charging loop is formed between the power supply device and the electric vehicle, a bidirectional on-board charger provided in the electric vehicle can convert the 220V AC voltage provided by the power supply device into the battery voltage of the electric vehicle to charge the electric vehicle.

[0057] In some embodiments, the switch S6 in the power supply device can be controlled to be closed, the switches S3 and S5 can be controlled to be opened, and the switch S4 in the electric vehicle can be controlled to be closed, so that a discharge loop can be formed between the power supply device and the electric vehicle.

[0058] In some embodiments, when a discharge loop is formed between the power supply device and the electric vehicle, the bidirectional on-board charger installed in the electric vehicle can convert the battery voltage of the electric vehicle into 220 volts AC voltage, and then power other electrical appliances through the power supply device, where the other electrical appliances can be various household appliances, such as washing machines, air conditioners, refrigerators, electric fans, and vacuum cleaners, etc., which are not specifically limited in the embodiments of the present application.

[0059] It should be noted that, based on the charge and discharge control guidance circuit provided in the embodiment of the present application, it is possible to use an electric vehicle as a household energy storage device, the power battery of the electric vehicle as an energy storage battery, and the bidirectional OBC in the electric vehicle as an energy converter. When the grid electricity price is lower than the set value, the automatic control bidirectional OBC converts the 220 volt AC voltage into the power battery voltage of the electric vehicle to charge the electric vehicle; when the grid electricity price is higher than the set value or there is a power outage, the automatic control bidirectional OBC inverts the power battery voltage of the electric vehicle into a 220 volt AC voltage to power household appliances.

[0060] It should be noted that the resistance values ​​of the resistor RC and the resistor R4 in the embodiment of the present application can be adaptively set based on actual applications, and the embodiment of the present application does not make any specific limitations on this.

[0061] It can be understood that the charge and discharge control guidance circuit provided in the embodiment of the present application can form a charging circuit between the power supply device and the electric vehicle by setting a switch S3, a resistor RC and a switch S5 connected in series between the ground line PE and the charge and discharge connection confirmation line CC in sequence, and a resistor R4 connected in parallel to both ends of the switch S3 in the power supply device, and by setting a switch S6 and a power supply on the charge and discharge connection confirmation line CC connected to the power supply control device in the power supply device, and setting a switch S4 and a power supply on the charge and discharge connection confirmation line CC connected to the vehicle control device in the electric vehicle, so that a discharge circuit can be formed between the power supply device and the electric vehicle, thereby based on the control function of the power supply control device in the power supply device and the vehicle control device in the electric vehicle, it is possible to realize automatic switching between the charging circuit and the discharging circuit, without the need for manual operation to switch the insertion of the charging gun and the discharging gun, thereby realizing the automatic charging and discharging function of the electric vehicle, thereby improving the user experience.

[0062] In some embodiments, the control confirmation line CP is used to: realize communication between the power supply device and the electric vehicle based on a power line carrier communication PLC signal.

[0063] In some embodiments, a PLC signal with a duty cycle of 5% may be loaded onto a CP signal transmitted based on the control confirmation line CP to achieve bidirectional communication between the power supply device and the electric vehicle.

[0064] For example, Figure 3 A schematic diagram of a PLC carrier communication circuit provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, EVSE is a power supply device, EV is an electric vehicle, and in EVSE, there are inductors L and resistors R Damp , resistor R1, resistor R M , capacitor C M , capacitor C S and capacitor C PLC ; In the EV, there are inductors L and resistors R Damp , resistor R M , resistor R2, resistor R3, diode D, switch S2, capacitor C V , capacitor C M and capacitor C PLC Among them, the marked point 1 is the amplitude / state measurement point, the marked point 2 is the PWM oscillator (the output signal amplitude is ±12V, and the period is 1kHz), the marked point 3 is the PLC chipset, the marked point 4 is the connecting lines CP and PE between EVSE and EV, and the marked point 5 is the duty cycle measurement point.

[0065] In some embodiments, the Figure 3The PLC signal generated by the PLC carrier communication circuit shown is loaded on the CP signal transmitted based on the control confirmation line CP to achieve two-way communication between the power supply equipment and the electric vehicle.

[0066] It should be noted that the CP signal can be used to monitor the interactive function between electric vehicles and power supply equipment. It is a communication method that uses PWM modulation and amplitude alternation, which is equivalent to the "handshake" signal between electric vehicles and power supply equipment. The CP signal indicates the maximum charging current data that the power supply equipment can provide through the duty cycle of the PWM signal, and the amplitude of the PWM signal indicates the different state numbers of the charging gun. During the charging process, the CP signal will correspond to several states of the charging gun and transmit information through a specific voltage value. For example, before the charging gun is connected to the electric vehicle, the CP signal is a high level of 12V; after the charging gun is connected to the electric vehicle, due to the presence of the voltage divider resistor in the on-board charger, the CP signal will jump to 9V; after the MCU of the power supply equipment detects that the CP signal jumps to 9V, it will switch the high level output to a PWM signal, and its duty cycle indicates the maximum output current of the power supply equipment; after the electric vehicle confirms the charging signal, it switches the voltage divider resistor in the on-board charger to make its signal jump to 6V; after the MCU of the power supply equipment detects that the CP signal jumps to 6V, the main relay closes and starts charging the electric vehicle; during the charging process, the amplitude of the PWM signal is detected in real time, and when it jumps to non-6V, the power is turned off in time.

[0067] In addition, the CP signal plays an important role in monitoring the interaction between the power supply equipment and the electric vehicle during the charging process of the electric vehicle. It can not only effectively prevent overload and short circuit between the electric vehicle and the power supply equipment, ensure the safety of the power supply equipment and the electric vehicle, but also determine the power supply capacity of the power supply equipment through the amplitude of the PWM signal.

[0068] It can be understood that the embodiment of the present application realizes communication between the power supply equipment and the electric vehicle by loading the PLC signal on the CP signal, which can establish charging and discharging services between the power supply equipment and the electric vehicle, that is, realize two-way communication, and can be expanded to multiple application scenarios to improve user experience.

[0069] In some embodiments, Figure 2 As shown, the power supply device is also provided with a grid interface, an electrical appliance interface, a contactor K3 and a contactor K4;

[0070] The grid interface is connected to the electrical appliance interface through the contactor K3 and the contactor K4 respectively, and the connection point between the contactor K3 and the electrical appliance interface is connected to the AC power line L, and the connection point between the contactor K4 and the electrical appliance interface is connected to the neutral line N.

[0071] It should be noted that the power grid interface in the embodiment of the present application is an external AC power supply interface.

[0072] It should be noted that when it is necessary to power various household appliances, after determining that at least one household appliance is plugged into the appliance interface, the power battery voltage of the electric vehicle can be inverted into 220V AC voltage by controlling the bidirectional OBC in the electric vehicle to power the household appliances.

[0073] It should be noted that the grid interface can be a single-phase electrical interface or a three-phase electrical interface. The embodiment of the present application does not make any specific limitations on this and can be adaptively set based on actual applications.

[0074] It should be noted that the electrical appliance interface can be a single-phase electrical interface or a three-phase electrical interface. The embodiment of the present application does not make specific limitations on this and can be adaptively set based on actual applications.

[0075] In some embodiments, when the electric vehicle needs to be charged, the power supply control device can control the contactor K3 and the contactor K4 to be closed; when the electric vehicle needs to be discharged, the power supply control device can control the contactor K3 and the contactor K4 to be disconnected.

[0076] It should be noted that a contactor is a switching device that uses electromagnetic, pneumatic or hydraulic principles to realize the on and off of the main circuit through a control circuit. Contactors can be divided into electromagnetic contactors, pneumatic contactors and hydraulic contactors according to the different power sources of the driving contact system; they can also be divided into air contactors, oil-immersed contactors and vacuum contactors according to the properties of the arc extinguishing medium. The embodiment of the present application does not specifically limit the types of contactors K3 and K4, and can be adaptively set based on actual applications.

[0077] It can be understood that the embodiment of the present application sets a power grid interface, an electrical appliance interface, a contactor K3 and a contactor K4 in the power supply equipment, and the power grid interface is connected to the electrical appliance interface through contactors K3 and K4 respectively, and the connection point between contactor K3 and the electrical appliance interface is connected to the AC power line L, and the connection point between contactor K4 and the electrical appliance interface is connected to the neutral line N. Based on the control of the on and off of contactors K3 and contactor K4, it is possible to realize automatic switching of the power grid interface and the electrical appliance interface to the charging and discharging circuit.

[0078] In some embodiments, Figure 2 As shown, the power supply device is also provided with a contactor K1 and a contactor K2;

[0079] One end of the contactor K1 is connected to the second connection point, and the other end is connected to the AC power line L. The second connection point is the connection point between the contactor K3 and the electrical appliance interface;

[0080] One end of the contactor K2 is connected to the third connection point, and the other end is connected to the neutral line N. The third connection point is the connection point between the contactor K4 and the electrical appliance interface.

[0081] It should be noted that the embodiment of the present application does not specifically limit the types of the contactor K1 and the contactor K2, and they can be adaptively configured based on actual applications. For example, the contactor K1 and the contactor K2 can be configured as electromagnetic contactors.

[0082] It can be understood that, in the embodiment of the present application, by providing a contactor K1 and a contactor K2 in the power supply device, and one end of the contactor K1 is connected to the second connection point, and the other end is connected to the AC power line L, and one end of the contactor K2 is connected to the third connection point, and the other end is connected to the neutral line N, it can be achieved that after determining that the electric vehicle is ready to charge, the power supply control device controls the contactor K1 and the contactor K2 to close, so that the AC circuit is turned on, so as to start charging the electric vehicle; after determining that the electrical appliance is ready to be powered, the power supply control device controls the contactor K1 and the contactor K2 to close, so that the AC circuit is turned on, so as to start powering the electrical appliance.

[0083] In some embodiments, the power supply control device is used to: upon receiving a charging request, control the contactor K1, the contactor K2, the contactor K3, the contactor K4, the switch S3 and the switch S5 in the power supply device to close, and control the switch S6 to open;

[0084] The vehicle control device is used to control the switch S4 in the electric vehicle to be disconnected when a charging request is received.

[0085] In the embodiment of the present application, the power supply control device in the power supply equipment and the vehicle control device in the electric vehicle can both receive the charging request or the discharging request sent by the user end. If the power supply control device and the vehicle control device both receive the charging request sent by the user end, the power supply control device can control the contactor K1, contactor K2, contactor K3, contactor K4, switch S3 and switch S5 in the power supply equipment to close, and control the switch S6 to open, and at the same time, the vehicle control device can control the switch S4 in the electric vehicle to open, so that a charging circuit is formed between the power supply equipment and the electric vehicle, and the electric vehicle is charged.

[0086] In some embodiments, the power supply control device is further used to: upon receiving a discharge request, control the contactor K1, the contactor K2 and the switch S6 in the power supply device to close, and control the contactor K3, the contactor K4, the switch S3 and the switch S5 to open;

[0087] The vehicle control device is further configured to control the switch S4 in the electric vehicle to close when a discharge request is received.

[0088] In an embodiment of the present application, if the power supply control device and the vehicle control device both receive a discharge request sent by the user end, the power supply control device can control the contactor K1, contactor K2 and switch S6 in the power supply equipment to close, and control the contactor K3, contactor K4, switch S3 and switch S5 to open. At the same time, the vehicle control device can control the switch S4 in the electric vehicle to close, thereby forming a discharge loop between the power supply equipment and the electric vehicle to power the electrical appliances.

[0089] In some embodiments, Figure 2 As shown, the power supply device is connected to the vehicle socket of the electric vehicle through a vehicle plug, and the vehicle socket is arranged in the vehicle interface of the electric vehicle;

[0090] The AC power line L, the neutral line N and the ground line PE are respectively connected to the power supply device, the vehicle interface and the bidirectional vehicle charger in sequence;

[0091] The charge-discharge connection confirmation line CC and the control confirmation line CP are respectively connected to the power supply control device, the vehicle interface and the vehicle control device in sequence.

[0092] It can be understood that the embodiment of the present application forms an AC conduction loop between the power supply equipment and the electric vehicle by using the AC power line L, the neutral line N and the ground line PE to connect the power supply equipment, the vehicle interface and the bidirectional on-board charger in sequence respectively, and by using the charge and discharge connection confirmation line CC and the control confirmation line CP to connect the power supply control device, the vehicle interface and the vehicle control device in sequence respectively, so that the charge and discharge connection confirmation line CC can be used to detect whether the vehicle plug and the vehicle socket are fully connected, and the control confirmation line CP can be used for communication between the power supply equipment and the electric vehicle, so that the power supply control device controls the charging voltage and charging current based on the obtained battery voltage parameters of the electric vehicle.

[0093] In some embodiments, Figure 2 As shown, a switch S7 is provided in the vehicle plug, and both ends of the switch S7 are connected to the power supply control device;

[0094] The power supply control device is further configured to: upon receiving the charging request, control the closing and opening of the switch S3 based on the closing and opening of the switch S7.

[0095] In the embodiment of the present application, the switch S7 provided in the vehicle plug can be closed and opened at will by the user, and the power supply control device, when receiving a charging request, can control the closing and opening of the switch S3 based on the closing and opening of the switch S7, that is, if the switch S7 is closed, the power supply control device controls the switch S3 to be closed, and if the switch S7 is opened, the power supply control device controls the switch S3 to be opened, so as to realize the control of the current or voltage in the charging circuit based on the user's needs.

[0096] In some embodiments, the switch S7 may be a normally closed switch of the vehicle plug, that is, when the user does not operate the switch S7 , the switch S7 is in a closed state by default.

[0097] In some embodiments, Figure 2 As shown, the power supply device is also provided with a switch S1 and a resistor R1;

[0098] The switch S1 includes a first end and a second end, and the resistor R1 includes a third end and a fourth end;

[0099] The first end is connected to an output interface of a pulse width modulation (PWM) wave on the power supply control device, the second end is connected to the third end, and the fourth end is connected to the control confirmation line CP.

[0100] It should be noted that the resistor R1 in the embodiment of the present application is an equivalent resistor, which is a parameter that simulates the actual resistor in the circuit and affects the magnitude of the current flow. The smaller the equivalent resistor, the greater the current allowed to flow.

[0101] It can be understood that, in the embodiment of the present application, by connecting the first end of the switch S1 to the output interface of the pulse width modulation PWM wave on the power supply control device, and connecting the second end of the switch S1 to the control confirmation line CP through the resistor R1, the CP signal transmitted by the control confirmation line CP can be a PWM wave with a duty cycle of 5% and a period of 1 kHz, so that the power supply control device can make corresponding control responses in a timely manner based on changes in the PWM wave amplitude.

[0102] In some embodiments, Figure 2 As shown, the electric car is also provided with a diode D1, a resistor R2, a resistor R3 and a switch S2;

[0103] The control confirmation line CP is connected to the vehicle control device through the diode D1;

[0104] The resistor R2 and the switch S2 are connected in series between a fourth connection point and a fifth connection point, the fourth connection point is a connection point between the diode D1 and the vehicle control device, and the fifth connection point is a connection point between the bidirectional on-board charger and the ground line PE;

[0105] The resistor R3 is connected in parallel to both ends of the resistor R2 and the switch S2.

[0106] In some embodiments, the switch S2 may be a normally closed switch, serving as a control pilot circuit switch inside the electric vehicle.

[0107] It should be noted that the diode has a unidirectional conductive characteristic. In the embodiment of the present application, the control confirmation line CP is connected to the vehicle control device through the diode D1, and the diode D1 can play a role in preventing reverse connection in this control guide circuit.

[0108] It should be noted that the resistance values ​​of the resistor R2 and the resistor R3 can be set to calibrated values ​​or adaptively set based on actual applications, and the embodiments of the present application do not specifically limit this.

[0109] It can be understood that the embodiment of the present application connects the control confirmation line CP to the vehicle control device through the diode D1, and connects the resistor R2 and the switch S2 in series between the fourth connection point and the fifth connection point, and connects the resistor R3 in parallel to the two ends of the resistor R2 and the switch S2, which can effectively realize the current conduction between the vehicle control device inside the electric vehicle and the bidirectional vehicle charger.

[0110] In some embodiments, the Figure 2 The charge and discharge control guide circuit shown in the figure realizes the charge and discharge of electric vehicles. For example, Figure 4 A schematic diagram of a charging and discharging process provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the charging and discharging process includes:

[0111] S401. On the power supply device side, determine that the cable connected to the charging and discharging gun has been inserted into the charging and discharging socket of the power supply device; on the electric vehicle side, determine that the charging and discharging gun has been inserted into the charging and discharging interface of the electric vehicle.

[0112] S402: The power supply device sets the CP signal duty cycle to 5% and sends a PLC communication identification signal to the electric vehicle.

[0113] S403, after receiving the CP signal sent by the power supply device, the electric vehicle identifies whether the power supply device supports PLC carrier communication; if it is determined that the power supply device supports PLC carrier communication, execute S404.

[0114] S404: The electric vehicle sends indication information that the electric vehicle supports charging and discharging services to the power supply equipment based on the PLC carrier signal.

[0115] S405, the power supply equipment identifies whether the electric vehicle supports PLC carrier communication and charging and discharging services; if it is determined that the electric vehicle supports PLC carrier communication and charging and discharging services, execute S406.

[0116] S406: The power supply device and the electric vehicle request a charge and discharge service or respond to a charge and discharge service to enter a charge and discharge state.

[0117] S407, the power supply equipment and the electric vehicle determine whether the vehicle needs to be charged or discharged according to user needs; if it is determined that the vehicle is charged, the power supply equipment side closes K1, K2, K3, and K4, disconnects S6, closes S5, controls S3 to open and close with S7, closes S1 to the output interface of the PWM wave, and the electric vehicle side closes S2 and disconnects S4; if it is determined that the vehicle is discharged, the power supply equipment side closes K1 and K2, disconnects K3 and K4, closes S6, disconnects S5 and S3, closes S1 to the output interface of the PWM wave, and the electric vehicle side closes S2 and closes S4.

[0118] In some embodiments, the user demand may be: when the grid electricity price is lower than a set value, determine to charge the electric vehicle; when the grid electricity price is higher than a set value or there is a power outage, determine to discharge the electric vehicle.

[0119] It should be noted that in the embodiment of the present application, the power supply equipment supports continued operation after a power outage in the power grid. When a power outage occurs in the power grid, the electric vehicle can transmit the 12V control power to the power supply equipment through the charge and discharge connection confirmation line CC, which is used for the power supply equipment to establish a communication connection and relay control.

[0120] S408. After the vehicle is charged or discharged, on the power supply device side, determine to unplug the cable connected to the charging and discharging gun from the charging and discharging socket of the power supply device; on the electric vehicle side, determine to unplug the charging and discharging gun from the charging and discharging interface of the electric vehicle.

[0121] It can be understood that the embodiment of the present application can form a charging circuit between the power supply device and the electric vehicle by setting a switch S3, a resistor RC and a switch S5 connected in series between the ground line PE and the charge and discharge connection confirmation line CC in the power supply device, and a resistor R4 connected in parallel to both ends of the switch S3, and by setting a switch S6 and a power supply on the charge and discharge connection confirmation line CC connected to the power supply control device in the power supply device, and setting a switch S4 and a power supply on the charge and discharge connection confirmation line CC connected to the vehicle control device in the electric vehicle, so that the power supply device and the electric vehicle can form a discharge circuit, so that based on the control function of the power supply control device in the power supply device and the vehicle control device in the electric vehicle, the automatic switching of the charging circuit and the discharge circuit can be realized, and the insertion of the charging gun and the discharge gun can be switched manually without manual operation, so that the automatic charging and discharging function of the electric vehicle can be realized, which improves the user experience. Moreover, by loading the PLC signal on the CP signal, the embodiment of the present application can establish a charging and discharging service between the power supply device and the electric vehicle, that is, realize two-way communication, expand multiple application scenarios, and improve user experience.

[0122] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0123] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the embodiments of the present application may adopt the form of hardware embodiments, software embodiments, or embodiments in combination with software and hardware. Moreover, the embodiments of the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0124] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0125] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0126] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0127] The above description is merely an optional embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A charge and discharge control guide circuit, characterized in that: Used to form a charging and discharging loop between a power supply device and an electric vehicle, wherein the power supply device is provided with a power supply control device, and the electric vehicle is provided with a bidirectional on-board charger and a vehicle control device; The charge and discharge control guide circuit comprises: An AC power line L, a neutral line N and a ground line PE connecting the power supply device and the bidirectional on-board charger, and a charge and discharge connection confirmation line CC and a control confirmation line CP connecting the power supply control device and the vehicle control device; The power supply device is further provided with a switch S3, a resistor RC and a switch S5 which are sequentially connected in series between the ground line PE and the charge-discharge connection confirmation line CC, and a resistor R4 which is connected in parallel to both ends of the switch S3, and a switch S6 and a power supply are provided on the charge-discharge connection confirmation line CC between the power supply control device and the first connection point, and the first connection point is the connection point between the switch S5 and the charge-discharge connection confirmation line CC; The electric vehicle is also provided with a switch S4 and a power supply. One end of the switch S4 is connected to the charge and discharge connection confirmation line CC, and the other end is connected to the power supply.

2. The charge and discharge control guide circuit according to claim 1, characterized in that: The power supply device is also provided with a power grid interface, an electrical appliance interface, a contactor K3 and a contactor K4; The grid interface is connected to the electrical appliance interface through the contactor K3 and the contactor K4 respectively, and the connection point between the contactor K3 and the electrical appliance interface is connected to the AC power line L, and the connection point between the contactor K4 and the electrical appliance interface is connected to the neutral line N.

3. The charge and discharge control guide circuit according to claim 2, characterized in that: The power supply device is also provided with a contactor K1 and a contactor K2; One end of the contactor K1 is connected to the second connection point, and the other end is connected to the AC power line L. The second connection point is the connection point between the contactor K3 and the electrical appliance interface; One end of the contactor K2 is connected to the third connection point, and the other end is connected to the neutral line N. The third connection point is the connection point between the contactor K4 and the electrical appliance interface.

4. The charge and discharge control guide circuit according to claim 3, characterized in that: The power supply control device is used to: when receiving a charging request, control the contactor K1, the contactor K2, the contactor K3, the contactor K4, the switch S3 and the switch S5 in the power supply device to close, and control the switch S6 to open; The vehicle control device is used to control the switch S4 in the electric vehicle to be disconnected when a charging request is received.

5. The charge and discharge control guide circuit according to claim 4, characterized in that: The power supply control device is also used for: in the case of receiving a discharge request, controlling the contactor K1, the contactor K2 and the switch S6 in the power supply device to close, and controlling the contactor K3, the contactor K4, the switch S3 and the switch S5 to open; The vehicle control device is further configured to control the switch S4 in the electric vehicle to close when a discharge request is received.

6. The charge and discharge control guide circuit according to claim 4, characterized in that: The power supply device is connected to the vehicle socket of the electric vehicle via a vehicle plug, and the vehicle socket is arranged in the vehicle interface of the electric vehicle; The AC power line L, the neutral line N and the ground line PE are respectively connected to the power supply device, the vehicle interface and the bidirectional vehicle charger in sequence; The charge-discharge connection confirmation line CC and the control confirmation line CP are respectively connected to the power supply control device, the vehicle interface and the vehicle control device in sequence.

7. The charge and discharge control guide circuit according to claim 6, characterized in that: A switch S7 is provided in the vehicle plug, and both ends of the switch S7 are connected to the power supply control device; The power supply control device is further configured to: upon receiving the charging request, control the closing and opening of the switch S3 based on the closing and opening of the switch S7.

8. The charge and discharge control guide circuit according to claim 1, characterized in that: The power supply device is also provided with a switch S1 and a resistor R1; The switch S1 includes a first end and a second end, and the resistor R1 includes a third end and a fourth end; The first end is connected to an output interface of a pulse width modulation (PWM) wave on the power supply control device, the second end is connected to the third end, and the fourth end is connected to the control confirmation line CP.

9. The charge and discharge control guide circuit according to claim 1, characterized in that: The electric car is also provided with a diode D1, a resistor R2, a resistor R3 and a switch S2; The control confirmation line CP is connected to the vehicle control device through the diode D1; The resistor R2 and the switch S2 are connected in series between a fourth connection point and a fifth connection point, the fourth connection point is a connection point between the diode D1 and the vehicle control device, and the fifth connection point is a connection point between the bidirectional on-board charger and the ground line PE; The resistor R3 is connected in parallel to both ends of the resistor R2 and the switch S2.

10. The charge and discharge control guide circuit according to any one of claims 1 to 9, characterized in that: The control confirmation line CP is used to realize communication between the power supply device and the electric vehicle based on a power line carrier communication PLC signal.

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