Boost converter charging control method, system, device and medium

Abstract

The application discloses a charging control method, system, device and medium of a BOOST voltage booster, and the method comprises the following steps: when receiving the charging capacity sent by a charging pile, acquiring the maximum output voltage capacity of the charging pile and the highest voltage of a battery; and performing charging control on a relay through the BOOST voltage booster according to the maximum output voltage capacity of the charging pile and the highest voltage of the battery. Compared with the prior art, the vehicle battery cannot be fully charged when charging a high-voltage (more than 750V) platform vehicle, and the application directly performs charging control on the relay through the BOOST voltage booster according to the maximum output voltage capacity of the charging pile and the highest voltage of the battery, so that the problem that the high-voltage platform vehicle battery cannot be fully charged is solved.

Description

Technical Field

[0001] This invention relates to the field of charging technology, and in particular to a charging control method, system, device and medium for a BOOST booster. Background Technology

[0002] High-voltage platforms for electric vehicles are becoming a development trend, offering advantages such as high charging power, fast charging speed, and high overall vehicle efficiency. However, since most charging stations on the market currently operate at 750V, existing technologies sometimes fail to fully charge batteries on high-voltage (above 750V) platforms. Therefore, resolving the issue of incomplete charging of batteries in high-voltage platform vehicles has become a pressing problem.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main objective of this invention is to provide a charging control method, system, device, and medium for a BOOST booster, aiming to solve the technical problem of high-voltage platform vehicle batteries not being able to be fully charged.

[0005] To achieve the above objectives, the present invention provides a charging control method for a BOOST boost converter, the charging control method for the BOOST boost converter comprising:

[0006] Upon receiving the charging capability data from the charging pile, obtain the charging pile's maximum output voltage capability and the battery's highest voltage.

[0007] The charging control of the relay is achieved through a BOOST booster based on the maximum output voltage capability of the charging pile and the highest voltage of the battery.

[0008] Optionally, the step of controlling the charging of the relay via the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum voltage of the battery includes:

[0009] When the maximum output voltage capability of the charging pile is greater than or equal to the maximum voltage of the battery, the charging control is performed by controlling the relay to be in a closed state through the BOOST booster.

[0010] Optionally, the step of controlling the charging of the relay via the BOOST booster based on the maximum output voltage capability of the charging pile and the highest voltage of the battery further includes:

[0011] When the maximum output voltage capability of the charging pile is less than the maximum voltage of the battery, the maximum output current capability of the charging pile is obtained;

[0012] The maximum output power of the charging pile is determined based on the maximum output current capability and the maximum output voltage capability of the charging pile.

[0013] The charging control of the relay is achieved through the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster.

[0014] Optionally, the step of controlling the charging of the relay via the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster includes:

[0015] When the maximum output power of the charging pile is less than the power of the BOOST booster, the BOOST booster controls the relay to be in the open state, and charging control is performed based on the BUCK buck unit.

[0016] Optionally, the step of charging control based on the BUCK buck unit includes:

[0017] The highest voltage of the battery is stepped down by the BUCK step-down unit to obtain the battery step-down voltage.

[0018] The voltage difference is determined based on the vehicle-side requested voltage and the battery step-down voltage.

[0019] Determine whether the voltage difference is less than or equal to a preset voltage threshold;

[0020] When the voltage difference is less than or equal to the preset voltage threshold, the BOOST boost unit is started.

[0021] After the BOOST boost unit is started, the BUCK buck unit is controlled to shut down.

[0022] A boost circuit is established based on the charging pile, the BOOST boost unit, and the battery;

[0023] The power battery is controlled to be charged by boosting based on the boost circuit.

[0024] Optionally, the step of controlling the charging of the relay via the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster further includes:

[0025] When the maximum output power of the charging pile is greater than or equal to the power of the BOOST booster, the relay is controlled to be in a closed state by the BOOST booster.

[0026] The BOOST boost unit is started according to the power demand of the vehicle.

[0027] After the BOOST boost unit is started, the relay is controlled to be in the off state;

[0028] A boost circuit is established based on the charging pile, the BOOST boost unit, and the battery;

[0029] The power battery is controlled to be charged by boosting based on the boost circuit.

[0030] Optionally, the step of controlling the BOOST boost unit to start according to the vehicle-side power demand includes:

[0031] The required power at the vehicle end is determined based on the charging current demand and the real-time battery voltage.

[0032] Determine whether the required power at the vehicle end is less than the power of the BOOST booster;

[0033] When the power demand at the vehicle end is less than the power of the BOOST booster, the BOOST booster unit is controlled to start.

[0034] Furthermore, to achieve the above objectives, the present invention also proposes a charging control system for a BOOST boost converter, the charging control system for the BOOST boost converter comprising:

[0035] The acquisition module is used to acquire the maximum output voltage capability of the charging pile and the highest battery voltage when it receives the charging capability sent by the charging pile;

[0036] The control module is used to control the charging of the relay through the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum voltage of the battery.

[0037] Furthermore, to achieve the above objectives, the present invention also proposes a charging control device for a BOOST boost converter, the device comprising: a memory, a processor, and a charging control program for the BOOST boost converter stored in the memory and executable on the processor, the charging control program for the BOOST boost converter being configured to implement the steps of the charging control method for the BOOST boost converter as described above.

[0038] Furthermore, to achieve the above objectives, the present invention also proposes a storage medium storing a charging control program for a BOOST boost converter, wherein when the BOOST boost converter charging control program is executed by a processor, the steps of the BOOST boost converter charging control method described above are implemented.

[0039] Upon receiving charging capability information from a charging pile, this invention first obtains the charging pile's maximum output voltage capability and the battery's highest voltage. Then, based on these parameters, it controls the charging of a relay via a BOOST boost converter. Compared to existing technologies that sometimes fail to fully charge high-voltage (over 750V) vehicles, this invention directly controls the charging of a relay using the BOOST boost converter based on the charging pile's maximum output voltage capability and the battery's highest voltage, thus solving the problem of incomplete battery charging for high-voltage vehicles and improving the user experience. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the charging control device of the BOOST booster in the hardware operating environment involved in the embodiments of the present invention;

[0041] Figure 2 This is a flowchart illustrating the first embodiment of the charging control method for the BOOST booster of the present invention;

[0042] Figure 3 This is a charging interaction diagram of the first embodiment of the charging control method for the BOOST boost converter of the present invention;

[0043] Figure 4 This is a flowchart illustrating the second embodiment of the charging control method for the BOOST booster of the present invention;

[0044] Figure 5 This is a flowchart illustrating the third embodiment of the charging control method for the BOOST booster of the present invention.

[0045] Figure 6 This is a structural block diagram of the first embodiment of the charging control system of the BOOST booster of the present invention.

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0048] Reference Figure 1 , Figure 1 This is a schematic diagram of the charging control device structure of the BOOST booster in the hardware operating environment involved in the embodiments of the present invention.

[0049] like Figure 1As shown, the charging control device of the BOOST booster may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 1005 may also be a storage system independent of the aforementioned processor 1001.

[0050] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the charging control device of the BOOST booster, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0051] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a charging control program for a BOOST booster.

[0052] exist Figure 1 In the charging control device of the BOOST boost converter shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the charging control device of the BOOST boost converter of the present invention can be set in the charging control device of the BOOST boost converter. The charging control device of the BOOST boost converter calls the charging control program of the BOOST boost converter stored in the memory 1005 through the processor 1001 and executes the charging control method of the BOOST boost converter provided in the embodiment of the present invention.

[0053] This invention provides a charging control method for a BOOST boost converter, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the charging control method for the BOOST booster of the present invention.

[0054] In this embodiment, the charging control method of the BOOST booster includes the following steps:

[0055] Step S10: Upon receiving the charging capability sent by the charging pile, obtain the maximum output voltage capability of the charging pile and the highest battery voltage.

[0056] It is easy to understand that the execution subject of this embodiment can be a charging control device of a BOOST booster with functions such as data processing, network communication and program execution, or other computer devices with similar functions. This embodiment does not limit it.

[0057] It should also be noted that the BOOST boost converter has a power output of 50kW and includes a BOOST boost unit, a BUCK buck unit, a relay bypass unit, and a control unit. The entire system comprises the BOOST boost converter, charging station, vehicle control unit (VCU), battery pack, and BMS controller. The controllers communicate with each other via the vehicle's CAN bus, while the charging station and VCU communicate via fast-charging CAN bus.

[0058] The BUCK step-down unit is used to acquire the terminal voltage of the battery pack and step it down to obtain a reduced voltage, which is then fed back to the charging station. The charging station can only start outputting power when the terminal voltage of the battery pack is lower than the output voltage of the charging station. Therefore, when the terminal voltage of the battery pack is higher than the output voltage of the charging station, the BUCK step-down unit is needed to step down the terminal voltage of the battery pack to "trick" the charging station into starting to output power.

[0059] In the specific implementation, refer to Figure 3 , Figure 3 This is a charging interaction diagram of the first embodiment of the charging control method for the BOOST booster of the present invention. When the charging gun is not inserted or the charging is not in progress, the VCU sends a control command to the BOOST booster to keep internal relays K1 and K2 in the normally open state. After the user inserts the charging gun and swipes their card, the charging pile establishes communication with the VCU, and the communication interaction is performed according to the GB_27930 communication protocol. After the VCU obtains the charging capability sent by the charging pile, it obtains the maximum output voltage capability of the charging pile and the highest battery voltage.

[0060] It should be understood that the maximum output voltage capability of a charging pile can be represented by CML_MaxOutput_Voltage, and the maximum battery voltage is the maximum voltage of the current vehicle battery.

[0061] Step S20: Based on the maximum output voltage capability of the charging pile and the highest voltage of the battery, the relay is charged using the BOOST booster.

[0062] In this embodiment, the method of controlling the charging of the relays via the BOOST booster based on the charging pile's maximum output voltage capability and the battery's highest voltage involves determining whether the charging pile's maximum output voltage capability is greater than or equal to the battery's highest voltage. If the charging pile's maximum output voltage capability is greater than or equal to the battery's highest voltage, the BOOST booster controls the relays to be in a closed state for charging control. The relays include relay K1 and relay K2.

[0063] In the specific implementation, it is necessary to process the maximum output voltage capability CML_MaxOutput_Voltage of the charging pile, and determine whether CML_MaxOutput_Voltage is greater than or equal to the highest battery voltage. When CML_MaxOutput_Voltage is greater than or equal to the highest battery voltage, the VCU controls relays K1 and K2 to be in the closed state through the BOOST booster. The VCU and the charging pile continue the charging process according to the GB_27930 protocol until the charging is completed.

[0064] Furthermore, the method of controlling the charging of the relay by using the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum battery voltage can also be used to determine whether the maximum output voltage capability of the charging pile is greater than or equal to the maximum battery voltage. When the maximum output voltage capability of the charging pile is less than the maximum battery voltage, two additional strategies are involved to control the charging of the relay.

[0065] In this embodiment, when the maximum output voltage capability of the charging pile is less than the maximum battery voltage, the maximum output current capability of the charging pile is obtained. Then, the maximum output power of the charging pile is determined based on the maximum output current capability and the maximum output voltage capability of the charging pile. Finally, the charging control of the relay is performed through the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster.

[0066] Furthermore, the method of controlling the relay for charging based on the maximum output power of the charging pile and the power of the BOOST booster can be as follows: when the maximum output power of the charging pile is less than the power of the BOOST booster, the relay is controlled to be in the open state by the BOOST booster, and charging control is performed based on the BUCK buck unit.

[0067] In the specific implementation, the VCU obtains the maximum output power of the charging pile, Charger_MaxOutput_Power, by multiplying CML_MaxOutput_Voltage by CML_MaxOutput_Current and CML_MaxOutput_Voltage, based on the maximum output current capability (CML_MaxOutput_Current) and the maximum output voltage capability (CML_MaxOutput_Voltage). It then compares the maximum output power (Charger_MaxOutput_Power) with the power of the BOOST boost converter (50kW). If Charger_MaxOutput_Power < 50kW, the VCU controls the internal relays K1 and K2 to disconnect via the BOOST boost converter and performs charging control based on the BUCK buck unit.

[0068] It should also be noted that GB_27930 defines that before the charging pile outputs voltage, it is necessary to determine that the charging port voltage has been established and that the difference between it and the voltage parameter sent by the vehicle through the CAN signal is within 5%.

[0069] Furthermore, the charging control method based on the BUCK step-down unit can be as follows: the highest voltage of the battery is stepped down by the BUCK step-down unit to obtain the battery step-down voltage. Then, the voltage difference is determined based on the voltage requested by the vehicle and the battery step-down voltage. It is then determined whether the voltage difference is less than or equal to a preset voltage threshold. If the voltage difference is less than or equal to the preset voltage threshold, the BOOST boost unit is started. After the BOOST boost unit is started, the BUCK step-down unit is stopped. Finally, a boost circuit is established based on the charging pile, the BOOST boost unit, and the battery. The power battery is then boosted and charged based on the boost circuit.

[0070] In its implementation, the VCU controls its internal BUCK step-down unit via the BOOST booster to step down the battery voltage to 380V, providing a pre-charge voltage to the charging pile. The VCU then sends a request for 385V voltage and 140A current to the charging pile. Upon detecting the charging port voltage, the charging pile initiates output and sends output voltage and current signals to the VCU via CAN communication. The voltage difference, |CCS_Output_Voltage-380|, is determined based on the voltage requested by the vehicle and the step-down voltage of the battery. When the VCU obtains the output voltage of the charging pile and it satisfies |CCS_Output_Voltage-380|<=10V, the VCU controls its internal BOOST boost unit to start through the BOOST boost unit. After the BOOST boost unit starts, the BOOST boost unit controls the internal BUCK step-down unit to shut down. At this time, a boost circuit is established through the charging pile, the BOOST boost unit, and the battery, which can boost the voltage of the power battery until charging is completed.

[0071] During the charging process, the VCU calculates the charging current demand at the vehicle end and sends it to the BOOST boost converter. Considering the response problem of the BOOST boost converter, the rate of adjustment of the demand current cannot be too fast. According to the actual measurement, the demand current adjustment rate is 5A / s, etc.

[0072] Furthermore, the method of controlling the relay to charge via the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster can also be implemented by controlling the relay to be in a closed state via the BOOST booster when the maximum output power of the charging pile is greater than or equal to the power of the BOOST booster.

[0073] In the specific implementation, the VCU obtains the maximum output power Charger_MaxOutput_Power of the charging pile based on the maximum output current capability CML_MaxOutput_Current and the maximum output voltage capability CML_MaxOutput_Voltage of the charging pile. It then calculates the maximum output power Charger_MaxOutput_Power of the charging pile by multiplying CML_MaxOutput_Current by CML_MaxOutput_Voltage. The VCU compares the maximum output power Charger_MaxOutput_Power of the charging pile with the power of the BOOST boost converter, which is 50kW. If Charger_MaxOutput_Power >= 50kW, the VCU first controls the BOOST boost converter to close internal relays K1 and K2.

[0074] After the BOOST booster control relay is in the closed state, the BOOST booster unit is started according to the power demand of the vehicle. After the BOOST booster unit is started, the control relay is in the open state. A boost circuit is established based on the charging pile, the BOOST booster unit, and the battery. The power battery is boosted and charged based on the boost circuit.

[0075] Furthermore, the method for controlling the BOOST boost unit to start based on the vehicle-side power demand is to determine the vehicle-side power demand based on the charging demand current and the real-time battery voltage, determine whether the vehicle-side power demand is less than the BOOST boost unit power, and control the BOOST boost unit to start when the vehicle-side power demand is less than the BOOST boost unit power.

[0076] In the specific implementation, the VCU first controls the BOOST booster to close internal relays K1 and K2. Then, the VCU and the charging pile continue charging interaction according to GB_27930. During charging, the VCU determines whether the vehicle's power demand is less than the BOOST booster's power, which is determined by the charging demand current BCL_ChargeCurrent * real-time battery voltage. When the vehicle's power demand is less than the BOOST booster's power, the VCU controls the BOOST booster to start its internal BOOST boost unit. After the BOOST booster starts its internal boost unit, relays K1 and K2 are disconnected. At this point, a boost circuit is established through the charging pile, the BOOST boost unit, and the battery, continuing to boost the power battery until charging is complete. During charging, the VCU calculates the vehicle's charging current demand and sends it to the BOOST booster. Considering the BOOST booster's response time, the rate of adjustment of the demand current cannot be too fast; based on actual measurements, the demand current adjustment rate is 5A / s, etc.

[0077] In this embodiment, upon receiving the charging capability information from the charging pile, the present invention first obtains the maximum output voltage capability of the charging pile and the highest battery voltage. Then, based on these parameters, it controls the charging of the relay via a BOOST boost converter. Compared to existing technologies that sometimes fail to fully charge the battery of high-voltage (over 750V) platform vehicles, this embodiment solves the problem of incomplete battery charging for high-voltage platform vehicles by controlling the relay's charging via a BOOST boost converter based on the charging pile's maximum output voltage capability and the battery's highest voltage.

[0078] refer to Figure 4 , Figure 4 This is a flowchart illustrating the second embodiment of the charging control method for the BOOST booster of the present invention.

[0079] Based on the first embodiment described above, in this embodiment, step S20 further includes:

[0080] Step S201: When the maximum output voltage capability of the charging pile is greater than or equal to the maximum voltage of the battery, the charging control is performed by controlling the relay to be in a closed state through the BOOST booster.

[0081] It should be noted that the relays include relay K1 and relay K2.

[0082] In the specific implementation, it is necessary to process the maximum output voltage capability CML_MaxOutput_Voltage of the charging pile, and determine whether CML_MaxOutput_Voltage is greater than or equal to the highest battery voltage. When CML_MaxOutput_Voltage is greater than or equal to the highest battery voltage, the VCU controls relays K1 and K2 to be in the closed state through the BOOST booster. The VCU and the charging pile continue the charging process according to the GB_27930 protocol until the charging is completed.

[0083] In this embodiment, when the maximum output voltage capability of the charging pile is greater than or equal to the highest battery voltage, the charging control is performed by controlling the relay to be in a closed state through the BOOST booster. Compared with the prior art, which does not compare the maximum output voltage capability of the charging pile with the highest battery voltage and directly charges the vehicle, resulting in the vehicle battery not being fully charged, this embodiment pre-compares the maximum output voltage capability of the charging pile with the highest battery voltage and controls the relay through the BOOST booster to obtain the most reasonable charging method.

[0084] refer to Figure 5 , Figure 5 This is a flowchart illustrating the third embodiment of the charging control method for the BOOST booster of the present invention.

[0085] Based on the first embodiment described above, in this embodiment, step S20 further includes:

[0086] Step S202: When the maximum output voltage capability of the charging pile is less than the maximum voltage of the battery, obtain the maximum output current capability of the charging pile.

[0087] In order to obtain the most reasonable charging strategy, it is necessary to determine in advance whether the maximum output voltage capability of the charging pile is greater than or equal to the highest battery voltage. That is, the maximum output voltage capability of the charging pile, CML_MaxOutput_Voltage, needs to be processed to determine whether CML_MaxOutput_Voltage is greater than or equal to the highest battery voltage.

[0088] Step S203: Determine the maximum output power of the charging pile based on its maximum output current capability and maximum output voltage capability.

[0089] In the specific implementation, the maximum output current capability of the charging pile is CML_MaxOutput_Current, the maximum output voltage capability of the charging pile is CML_MaxOutput_Voltage, and then the maximum output power of the charging pile is obtained by multiplying CML_MaxOutput_Current by CML_MaxOutput_Voltage.

[0090] Step S204: Based on the maximum output power of the charging pile and the power of the BOOST booster, the relay is charged and controlled by the BOOST booster.

[0091] Furthermore, the method of controlling the relay for charging based on the maximum output power of the charging pile and the power of the BOOST booster can be as follows: when the maximum output power of the charging pile is less than the power of the BOOST booster, the relay is controlled to be in the open state by the BOOST booster, and charging control is performed based on the BUCK buck unit.

[0092] In the specific implementation, the VCU obtains the maximum output power of the charging pile, Charger_MaxOutput_Power, by multiplying CML_MaxOutput_Voltage by CML_MaxOutput_Current and CML_MaxOutput_Voltage, based on the maximum output current capability (CML_MaxOutput_Current) and the maximum output voltage capability (CML_MaxOutput_Voltage). It then compares the maximum output power (Charger_MaxOutput_Power) with the power of the BOOST boost converter (50kW). If Charger_MaxOutput_Power < 50kW, the VCU controls the internal relays K1 and K2 to disconnect via the BOOST boost converter and performs charging control based on the BUCK buck unit.

[0093] It should also be noted that GB_27930 defines that before the charging pile outputs voltage, it is necessary to determine that the charging port voltage has been established and that the difference between it and the voltage parameter sent by the vehicle through the CAN signal is within 5%.

[0094] Furthermore, the charging control method based on the BUCK step-down unit can be as follows: the highest voltage of the battery is stepped down by the BUCK step-down unit to obtain the battery step-down voltage. Then, the voltage difference is determined based on the voltage requested by the vehicle and the battery step-down voltage. It is then determined whether the voltage difference is less than or equal to a preset voltage threshold. If the voltage difference is less than or equal to the preset voltage threshold, the BOOST boost unit is started. After the BOOST boost unit is started, the BUCK step-down unit is stopped. Finally, a boost circuit is established based on the charging pile, the BOOST boost unit, and the battery. The power battery is then boosted and charged based on the boost circuit.

[0095] In its implementation, the VCU controls its internal BUCK step-down unit via the BOOST booster to step down the battery voltage to 380V, providing a pre-charge voltage to the charging pile. The VCU then sends a request for 385V voltage and 140A current to the charging pile. Upon detecting the charging port voltage, the charging pile initiates output and sends output voltage and current signals to the VCU via CAN communication. The voltage difference, |CCS_Output_Voltage-380|, is determined based on the voltage requested by the vehicle and the step-down voltage of the battery. When the VCU obtains the output voltage of the charging pile and it satisfies |CCS_Output_Voltage-380|<=10V, the VCU controls its internal BOOST boost unit to start through the BOOST boost unit. After the BOOST boost unit starts, the BOOST boost unit controls the internal BUCK step-down unit to shut down. At this time, a boost circuit is established through the charging pile, the BOOST boost unit, and the battery, which can boost the voltage of the power battery until charging is completed.

[0096] During the charging process, the VCU calculates the charging current demand at the vehicle end and sends it to the BOOST boost converter. Considering the response problem of the BOOST boost converter, the rate of adjustment of the demand current cannot be too fast. According to the actual measurement, the demand current adjustment rate is 5A / s, etc.

[0097] Furthermore, the method of controlling the relay to charge via the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster can also be implemented by controlling the relay to be in a closed state via the BOOST booster when the maximum output power of the charging pile is greater than or equal to the power of the BOOST booster.

[0098] In the specific implementation, the VCU obtains the maximum output power Charger_MaxOutput_Power of the charging pile based on the maximum output current capability CML_MaxOutput_Current and the maximum output voltage capability CML_MaxOutput_Voltage of the charging pile. It then calculates the maximum output power Charger_MaxOutput_Power of the charging pile by multiplying CML_MaxOutput_Current by CML_MaxOutput_Voltage. The VCU compares the maximum output power Charger_MaxOutput_Power of the charging pile with the power of the BOOST boost converter, which is 50kW. If Charger_MaxOutput_Power >= 50kW, the VCU first controls the BOOST boost converter to close internal relays K1 and K2.

[0099] After the BOOST booster control relay is in the closed state, the BOOST booster unit is started according to the power demand of the vehicle. After the BOOST booster unit is started, the control relay is in the open state. A boost circuit is established based on the charging pile, the BOOST booster unit, and the battery. The power battery is boosted and charged based on the boost circuit.

[0100] Furthermore, the method for controlling the BOOST boost unit to start based on the vehicle-side power demand is to determine the vehicle-side power demand based on the charging demand current and the real-time battery voltage, determine whether the vehicle-side power demand is less than the BOOST boost unit power, and control the BOOST boost unit to start when the vehicle-side power demand is less than the BOOST boost unit power.

[0101] In the specific implementation, the VCU first controls the BOOST booster to close internal relays K1 and K2. Then, the VCU and the charging pile continue charging interaction according to GB_27930. During charging, the VCU determines whether the vehicle's power demand is less than the BOOST booster's power, which is determined by the charging demand current BCL_ChargeCurrent * real-time battery voltage. When the vehicle's power demand is less than the BOOST booster's power, the VCU controls the BOOST booster to start its internal BOOST boost unit. After the BOOST booster starts its internal boost unit, relays K1 and K2 are disconnected. At this point, a boost circuit is established through the charging pile, the BOOST boost unit, and the battery, continuing to boost the power battery until charging is complete. During charging, the VCU calculates the vehicle's charging current demand and sends it to the BOOST booster. Considering the BOOST booster's response time, the rate of adjustment of the demand current cannot be too fast; based on actual measurements, the demand current adjustment rate is 5A / s, etc.

[0102] In this embodiment, when the maximum output voltage capability of the charging pile is less than the highest battery voltage, the maximum output current capability of the charging pile is obtained. Then, the maximum output power of the charging pile is determined based on the maximum output current capability and the maximum output voltage capability. Subsequently, the charging pile's maximum output power and the BOOST boost converter power are used to control the charging of the relay. Compared to the prior art, which does not compare the maximum output voltage capability of the charging pile with the highest battery voltage, and does not involve charging control based on the maximum output power of the charging pile and the BOOST boost converter power, the prior art directly connects the charging pile to the vehicle and charges the vehicle, resulting in the vehicle battery not being fully charged. In this embodiment, after comparing the maximum output voltage capability of the charging pile with the highest battery voltage, the charging pile's maximum output power and the BOOST boost converter power are used to control the charging of the relay, thus providing a better charging strategy and ensuring that the vehicle battery is fully charged.

[0103] Reference Figure 6 , Figure 6 This is a structural block diagram of the first embodiment of the charging control system of the BOOST booster of the present invention.

[0104] like Figure 6 As shown, the charging control system for the BOOST booster proposed in this embodiment of the invention includes:

[0105] The acquisition module 6001 is used to acquire the maximum output voltage capability of the charging pile and the highest battery voltage when it receives the charging capability sent by the charging pile.

[0106] It should also be noted that the BOOST boost converter has a power output of 50kW and includes a BOOST boost unit, a BUCK buck unit, a relay bypass unit, and a control unit. The entire system comprises the BOOST boost converter, charging station, vehicle control unit (VCU), battery pack, and BMS controller. The controllers communicate with each other via the vehicle's CAN bus, while the charging station and VCU communicate via fast-charging CAN bus.

[0107] The BUCK step-down unit is used to acquire the terminal voltage of the battery pack and step it down to obtain a reduced voltage, which is then fed back to the charging station. The charging station can only start outputting power when the terminal voltage of the battery pack is lower than the output voltage of the charging station. Therefore, when the terminal voltage of the battery pack is higher than the output voltage of the charging station, the BUCK step-down unit is needed to step down the terminal voltage of the battery pack to "trick" the charging station into starting to output power.

[0108] In the specific implementation, refer to Figure 3 , Figure 3This is a charging interaction diagram of the first embodiment of the charging control method for the BOOST booster of the present invention. When the charging gun is not inserted or the charging is not in progress, the VCU sends a control command to the BOOST booster to keep internal relays K1 and K2 in the normally open state. After the user inserts the charging gun and swipes their card, the charging pile establishes communication with the VCU, and the communication interaction is performed according to the GB_27930 communication protocol. After the VCU obtains the charging capability sent by the charging pile, it obtains the maximum output voltage capability of the charging pile and the highest battery voltage.

[0109] It should be understood that the maximum output voltage capability of a charging pile can be represented by CML_MaxOutput_Voltage, and the maximum battery voltage is the maximum voltage of the current vehicle battery.

[0110] The control module 6002 is used to control the charging of the relay through the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum voltage of the battery.

[0111] In this embodiment, the method of controlling the charging of the relays via the BOOST booster based on the charging pile's maximum output voltage capability and the battery's highest voltage involves determining whether the charging pile's maximum output voltage capability is greater than or equal to the battery's highest voltage. If the charging pile's maximum output voltage capability is greater than or equal to the battery's highest voltage, the BOOST booster controls the relays to be in a closed state for charging control. The relays include relay K1 and relay K2.

[0112] In the specific implementation, it is necessary to process the maximum output voltage capability CML_MaxOutput_Voltage of the charging pile, and determine whether CML_MaxOutput_Voltage is greater than or equal to the highest battery voltage. When CML_MaxOutput_Voltage is greater than or equal to the highest battery voltage, the VCU controls relays K1 and K2 to be in the closed state through the BOOST booster. The VCU and the charging pile continue the charging process according to the GB_27930 protocol until the charging is completed.

[0113] Furthermore, the method of controlling the charging of the relay by using the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum battery voltage can also be used to determine whether the maximum output voltage capability of the charging pile is greater than or equal to the maximum battery voltage. When the maximum output voltage capability of the charging pile is less than the maximum battery voltage, two additional strategies are involved to control the charging of the relay.

[0114] In this embodiment, when the maximum output voltage capability of the charging pile is less than the maximum battery voltage, the maximum output current capability of the charging pile is obtained. Then, the maximum output power of the charging pile is determined based on the maximum output current capability and the maximum output voltage capability of the charging pile. Finally, the charging control of the relay is performed through the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster.

[0115] Furthermore, the method of controlling the relay for charging based on the maximum output power of the charging pile and the power of the BOOST booster can be as follows: when the maximum output power of the charging pile is less than the power of the BOOST booster, the relay is controlled to be in the open state by the BOOST booster, and charging control is performed based on the BUCK buck unit.

[0116] In the specific implementation, the VCU obtains the maximum output power of the charging pile, Charger_MaxOutput_Power, by multiplying CML_MaxOutput_Voltage by CML_MaxOutput_Current and CML_MaxOutput_Voltage, based on the maximum output current capability (CML_MaxOutput_Current) and the maximum output voltage capability (CML_MaxOutput_Voltage). It then compares the maximum output power (Charger_MaxOutput_Power) with the power of the BOOST boost converter (50kW). If Charger_MaxOutput_Power < 50kW, the VCU controls the internal relays K1 and K2 to disconnect via the BOOST boost converter and performs charging control based on the BUCK buck unit.

[0117] It should also be noted that GB_27930 defines that before the charging pile outputs voltage, it is necessary to determine that the charging port voltage has been established and that the difference between it and the voltage parameter sent by the vehicle through the CAN signal is within 5%.

[0118] Furthermore, the charging control method based on the BUCK step-down unit can be as follows: the highest voltage of the battery is stepped down by the BUCK step-down unit to obtain the battery step-down voltage. Then, the voltage difference is determined based on the voltage requested by the vehicle and the battery step-down voltage. It is then determined whether the voltage difference is less than or equal to a preset voltage threshold. If the voltage difference is less than or equal to the preset voltage threshold, the BOOST boost unit is started. After the BOOST boost unit is started, the BUCK step-down unit is stopped. Finally, a boost circuit is established based on the charging pile, the BOOST boost unit, and the battery. The power battery is then boosted and charged based on the boost circuit.

[0119] In its implementation, the VCU controls its internal BUCK step-down unit via the BOOST booster to step down the battery voltage to 380V, providing a pre-charge voltage to the charging pile. The VCU then sends a request for 385V voltage and 140A current to the charging pile. Upon detecting the charging port voltage, the charging pile initiates output and sends output voltage and current signals to the VCU via CAN communication. The voltage difference, |CCS_Output_Voltage-380|, is determined based on the voltage requested by the vehicle and the step-down voltage of the battery. When the VCU obtains the output voltage of the charging pile and it satisfies |CCS_Output_Voltage-380|<=10V, the VCU controls its internal BOOST boost unit to start through the BOOST boost unit. After the BOOST boost unit starts, the BOOST boost unit controls the internal BUCK step-down unit to shut down. At this time, a boost circuit is established through the charging pile, the BOOST boost unit, and the battery, which can boost the voltage of the power battery until charging is completed.

[0120] During the charging process, the VCU calculates the charging current demand at the vehicle end and sends it to the BOOST boost converter. Considering the response problem of the BOOST boost converter, the rate of adjustment of the demand current cannot be too fast. According to the actual measurement, the demand current adjustment rate is 5A / s, etc.

[0121] Furthermore, the method of controlling the relay to charge via the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster can also be implemented by controlling the relay to be in a closed state via the BOOST booster when the maximum output power of the charging pile is greater than or equal to the power of the BOOST booster.

[0122] In the specific implementation, the VCU obtains the maximum output power Charger_MaxOutput_Power of the charging pile based on the maximum output current capability CML_MaxOutput_Current and the maximum output voltage capability CML_MaxOutput_Voltage of the charging pile. It then calculates the maximum output power Charger_MaxOutput_Power of the charging pile by multiplying CML_MaxOutput_Current by CML_MaxOutput_Voltage. The VCU compares the maximum output power Charger_MaxOutput_Power of the charging pile with the power of the BOOST boost converter, which is 50kW. If Charger_MaxOutput_Power >= 50kW, the VCU first controls the BOOST boost converter to close internal relays K1 and K2.

[0123] After the BOOST booster control relay is in the closed state, the BOOST booster unit is started according to the power demand of the vehicle. After the BOOST booster unit is started, the control relay is in the open state. A boost circuit is established based on the charging pile, the BOOST booster unit, and the battery. The power battery is boosted and charged based on the boost circuit.

[0124] Furthermore, the method for controlling the BOOST boost unit to start based on the vehicle-side power demand is to determine the vehicle-side power demand based on the charging demand current and the real-time battery voltage, determine whether the vehicle-side power demand is less than the BOOST boost unit power, and control the BOOST boost unit to start when the vehicle-side power demand is less than the BOOST boost unit power.

[0125] In the specific implementation, the VCU first controls the BOOST booster to close internal relays K1 and K2. Then, the VCU and the charging pile continue charging interaction according to GB_27930. During charging, the VCU determines whether the vehicle's power demand is less than the BOOST booster's power, which is determined by the charging demand current BCL_ChargeCurrent * real-time battery voltage. When the vehicle's power demand is less than the BOOST booster's power, the VCU controls the BOOST booster to start its internal BOOST boost unit. After the BOOST booster starts its internal boost unit, relays K1 and K2 are disconnected. At this point, a boost circuit is established through the charging pile, the BOOST boost unit, and the battery, continuing to boost the power battery until charging is complete. During charging, the VCU calculates the vehicle's charging current demand and sends it to the BOOST booster. Considering the BOOST booster's response time, the rate of adjustment of the demand current cannot be too fast; based on actual measurements, the demand current adjustment rate is 5A / s, etc.

[0126] In this embodiment, upon receiving the charging capability information from the charging pile, the present invention first obtains the maximum output voltage capability of the charging pile and the highest battery voltage. Then, based on these parameters, it controls the charging of the relay via a BOOST boost converter. Compared to existing technologies that sometimes fail to fully charge the battery of high-voltage (over 750V) platform vehicles, this embodiment solves the problem of incomplete battery charging for high-voltage platform vehicles by controlling the relay's charging via a BOOST boost converter based on the charging pile's maximum output voltage capability and the battery's highest voltage.

[0127] Other embodiments or specific implementations of the charging control system of the BOOST booster of the present invention can be referred to the above-described method embodiments, and will not be repeated here.

[0128] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0129] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0130] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0131] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A charge control method of a BOOST voltage converter, characterized by, The charging control method for the BOOST boost converter includes the following steps: Upon receiving the charging capability data from the charging pile, obtain the charging pile's maximum output voltage capability and the battery's highest voltage. The charging control of the relay is achieved through the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum voltage of the battery. The step of controlling the charging of the relay via the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum voltage of the battery includes: When the maximum output voltage capability of the charging pile is less than the maximum voltage of the battery, the maximum output current capability of the charging pile is obtained; The maximum output power of the charging pile is determined based on the maximum output current capability and the maximum output voltage capability of the charging pile. The charging control of the relay is achieved through the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster. The step of controlling the charging of the relay via the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster includes: When the maximum output power of the charging pile is less than the power of the BOOST booster, the relay is controlled to be in the open state by the BOOST booster, and charging control is performed based on the BUCK buck unit; The BOOST booster device includes a BOOST boost unit, a BUCK buck unit, and a relay bypass unit; the BUCK buck unit steps down the highest voltage of the battery to obtain a battery buck voltage, which is then fed back to the charging pile.

2. The method of claim 1, wherein, The step of controlling the charging of the relay via the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum voltage of the battery includes: When the maximum output voltage capability of the charging pile is greater than or equal to the maximum voltage of the battery, the charging control is performed by controlling the relay to be in a closed state through the BOOST booster.

3. The method of claim 1, wherein, The steps for charging control based on the BUCK buck unit include: The voltage difference is determined based on the vehicle-side requested voltage and the battery step-down voltage. Determine whether the voltage difference is less than or equal to a preset voltage threshold; When the voltage difference is less than or equal to the preset voltage threshold, the BOOST boost unit is started. After the BOOST boost unit is started, the BUCK buck unit is controlled to shut down. A boost circuit is established based on the charging pile, the BOOST boost unit, and the battery; The power battery is controlled to be charged by boosting based on the boost circuit.

4. The method as described in claim 1, characterized in that, The step of controlling the charging of the relay via the BOOST booster based on the maximum output power of the charging pile and the power of the BOOST booster further includes: When the maximum output power of the charging pile is greater than or equal to the power of the BOOST booster, the relay is controlled to be in a closed state by the BOOST booster. The BOOST boost unit is started according to the power demand of the vehicle. After the BOOST boost unit is started, the relay is controlled to be in the off state; A boost circuit is established based on the charging pile, the BOOST boost unit, and the battery; The power battery is controlled to be charged by boosting based on the boost circuit.

5. The method as described in claim 4, characterized in that, The step of controlling the BOOST boost unit to start according to the vehicle-side power demand includes: The required power at the vehicle end is determined based on the charging current demand and the real-time battery voltage. Determine whether the required power at the vehicle end is less than the power of the BOOST booster; When the power demand at the vehicle end is less than the power of the BOOST booster, the BOOST booster unit is controlled to start.

6. A charging control system for a BOOST boost converter, applied to the charging control method for the BOOST boost converter as described in claim 1, characterized in that, The charging control system of the BOOST booster includes: The acquisition module is used to acquire the maximum output voltage capability of the charging pile and the highest battery voltage when it receives the charging capability sent by the charging pile; The control module is used to control the charging of the relay through the BOOST booster based on the maximum output voltage capability of the charging pile and the maximum voltage of the battery.

7. A charging control device for a BOOST booster, characterized in that, The device includes: a memory, a processor, and a BOOST boost converter charging control program stored in the memory and executable on the processor, the BOOST boost converter charging control program being configured to implement the steps of the BOOST boost converter charging control method as described in any one of claims 1 to 5.

8. A storage medium, characterized in that, The storage medium stores a charging control program for a BOOST boost converter, which, when executed by a processor, implements the steps of the charging control method for a BOOST boost converter as described in any one of claims 1 to 5.

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