Power buffering system and method for high-power bidirectional wireless charging equipment

Abstract

The invention discloses a power buffering system and method for high-power bidirectional wireless charging equipment, and relates to the technical field of wireless power transmission. According to the device, a super capacitor module and a power optimization controller are integrated on a receiving side, a high-power energy transfer buffer algorithm is carried, a super capacitor serves as an electric energy buffer of an energy storage battery of the device, the electric quantity of the battery and the charging and discharging power are stabilized, and high-power electric energy interaction between global power grids is achieved. And a DCDC output path is improved and designed, so that the problem of insufficient voltage of the super capacitor in a low-electric-quantity working condition is solved. According to the equipment, the problem that the battery is damaged by high-power charging when the battery is fully charged and high-power discharging when the battery is low can be solved, and the damage to the battery caused by over-charging, over-discharging, high-power charging and discharging and the like is reduced.

Description

Technical Field

[0001] This invention discloses a power buffering system and method for high-power bidirectional wireless charging devices, relating to the field of wireless power transmission technology. Background Technology

[0002] High-power wireless power transfer (WPT) technology can be applied to mobile transportation equipment such as warehouse robots, AGVs, and new energy buses. Particularly in applications with relatively fixed work and docking points, WPT enables short-term high-power replenishment, significantly extending the equipment's endurance and reducing the need for energy storage battery capacity. Furthermore, it can also supply power to the grid in reverse, enabling clusters of transportation equipment to function as short-term energy storage power stations.

[0003] However, energy storage batteries have limitations in both charging power at high charge levels and discharging power at low charge levels. High-power charging and discharging accelerates battery degradation, and frequent charging and discharging shortens battery life. Therefore, reducing the external charging and discharging power and frequency of the battery without affecting the input and output power requirements presents a significant challenge. Supercapacitors have extremely high power density; however, their excessively low voltage at low charge levels also poses a problem for system stability. Summary of the Invention

[0004] This invention addresses the problems of existing technologies by providing a power buffering system and method for high-power bidirectional wireless charging devices. The technical solution adopted is as follows: In a first aspect, a power buffer system for a high-power bidirectional wireless charging device includes a bidirectional wireless charging module and a power buffer management module. The bidirectional wireless charging module includes a bidirectional inverter / rectifier, a compensation network, and a coupling mechanism; the bidirectional inverter / rectifier and the coupling mechanism are connected through the compensation network. The power supply side and equipment side of the bidirectional wireless charging system are respectively equipped with bidirectional wireless charging modules, and the power supply side and equipment side are connected by the coupling mechanism corresponding to their respective bidirectional wireless charging modules. The power buffer management module includes a supercapacitor and a power optimization controller; the power optimization controller is connected to the inverter / rectifier on the equipment side via the supercapacitor; the equipment side is connected to the energy storage battery via the power optimization controller; wherein... The power optimization controller includes a bidirectional DC-DC converter and a connection structure switching branch.

[0005] In some implementations, the power optimization controller includes a bidirectional DC-DC converter and a connection structure switching branch; wherein, the connection structure switching branch includes a power switching device and a compensation capacitor; when the power switching device is turned on, the supercapacitor and the DC-DC converter are in a cascaded mode; when the power switching device is turned off, the supercapacitor and the DC-DC converter are in a series mode, and the DC-DC converter is connected in series with the supercapacitor through the compensation capacitor.

[0006] In a second aspect, embodiments of the present invention provide a power buffering method for a high-power bidirectional wireless charging device, used to control the power buffering system as described in the first aspect, comprising: S10, according to external instructions, the target operating mode of the energy storage battery is obtained through the transport equipment; wherein, the target operating mode includes charging mode, discharging mode and power retention mode; S20, based on the target operating mode and the real-time voltage of the supercapacitor, the power optimization controller performs operating mode and output voltage adjustment processing; wherein, the operating mode includes cascade buck-boost mode and series voltage compensation mode; S30, based on the target operating mode and the real-time voltage of the supercapacitor, the bidirectional wireless charging module controls the direction and power of power transmission.

[0007] In some implementations, when the target operating mode is a charging mode, S20 includes: S210, if the real-time voltage of the supercapacitor is higher than the first preset threshold, the power optimization controller executes the cascade buck-boost mode to power the vehicle equipment using the supercapacitor and to charge the energy storage battery with the first charging power. S211, if the real-time voltage of the supercapacitor is lower than the first preset threshold, the series voltage compensation mode is executed through the power optimization controller to power the vehicle equipment using the supercapacitor and to suspend charging of the energy storage battery.

[0008] In some implementations, when the target operating mode is charging mode and the carrier equipment arrives at the wireless charging location, S30 includes: S310 uses the bidirectional wireless charging module to transmit high-power electrical energy in the forward direction to charge the supercapacitor.

[0009] In some implementations, when the target operating mode is a discharge mode, S20 includes: S220, the power optimization controller executes the reverse power transmission mode, uses the energy storage battery to power the vehicle equipment, and charges the supercapacitor with the second charging power until the supercapacitor voltage is higher than the second preset threshold.

[0010] In some implementations, when the target operating mode is discharge mode and the carrier equipment arrives at the wireless charging location, S30 includes: S320, reverse high-power power transmission is performed through the bidirectional wireless charging module, and power is fed to the grid side using the supercapacitor. At the same time, according to S220, the energy storage battery continues to charge the supercapacitor with the second charging power.

[0011] In some implementations, when the target operating mode is a power retention mode, S20 includes: S230, the output voltage of the power optimization controller is matched with the voltage of the energy storage battery, and the power optimization controller is controlled to select the corresponding operating mode according to the real-time voltage of the supercapacitor.

[0012] In some implementations, S230 includes: S231, if the real-time voltage is higher than the third preset threshold, the cascaded buck-boost mode is executed by the power optimization controller; S232, if the real-time voltage is lower than the third preset threshold, the power optimization controller operates in series voltage compensation mode.

[0013] Thirdly, embodiments of the present invention provide a computer storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, it implements the method described in the first aspect.

[0014] One or more embodiments of the present invention can bring at least the following beneficial effects: This invention integrates a supercapacitor module and a power optimization controller on the receiving side, and incorporates a high-power energy transfer buffer algorithm. The supercapacitor acts as an energy buffer for the device's energy storage battery, stabilizing battery charge and charging / discharging power, enabling high-power energy exchange between the entire power grid. Furthermore, the DC-DC output path has been improved to address the issue of insufficient voltage in low-charge conditions of the supercapacitor. This invention also solves the problem of battery damage caused by high-power charging when the battery is fully charged and high-power discharging when the battery is low, reducing damage from overcharging, over-discharging, and high-power charging / discharging. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a power buffer system for a high-power bidirectional wireless charging device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the energy flow direction of the power buffer system under high-power charging conditions for transport equipment provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the energy flow direction of the power buffer system under high-power discharge conditions of the carrier equipment provided in the embodiments of the present invention; Figure 4 This is a schematic diagram of the energy flow direction of the power buffer system during the discharge of the vehicle equipment under the condition of maintaining the battery charge of the vehicle equipment's energy storage battery, provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the energy flow direction of the power buffer system when the vehicle equipment maintains its power level under the condition of maintaining the battery charge of the vehicle equipment, provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the power optimization controller structure provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the cascaded buck-boost mode of the power optimization controller provided in an embodiment of the present invention; Figure 8 This is an implementation diagram of the series voltage compensation mode of the power optimization controller provided in this embodiment of the invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Example 1: Figure 1 A schematic diagram of a power buffer system for a high-power bidirectional wireless charging device is shown, as follows: Figure 1 As shown, the power buffer system for a high-power bidirectional wireless charging system provided in this embodiment includes a bidirectional wireless charging module and a power buffer management module. The bidirectional wireless charging module includes a bidirectional inverter / rectifier, a compensation network, and a coupling mechanism; the bidirectional inverter / rectifier and the coupling mechanism are connected through the compensation network. The power supply side and equipment side of the bidirectional wireless charging system are respectively equipped with bidirectional wireless charging modules, and the power supply side and equipment side are connected by the coupling mechanism corresponding to their respective bidirectional wireless charging modules. The power buffer management module includes a supercapacitor and a power optimization controller; the power optimization controller is connected to the inverter / rectifier on the equipment side via the supercapacitor; the equipment side is connected to the energy storage battery via the power optimization controller; wherein... The power optimization controller includes a bidirectional DC-DC converter and a connection structure switching branch.

[0019] Furthermore, the power optimization controller includes a bidirectional DC-DC converter and a connection structure switching branch; wherein, the connection structure switching branch includes power switching devices VTs and a compensation capacitor C1; when the power switching devices VTs are turned on, the supercapacitor and the DC-DC converter are in cascade mode, and the input voltage of the energy storage battery is adjusted by the DC-DC converter for the operation of the supercapacitor with a higher voltage; when the power switching devices VTs are turned off, the supercapacitor and the DC-DC converter are in series mode, and the DC-DC converter is connected in series with the supercapacitor through the compensation capacitor, and the input voltage of the energy storage battery is the supercapacitor and the output voltage of the DC-DC converter are superimposed in series, for the operation of the supercapacitor with a lower voltage.

[0020] Based on the energy flow direction requirements and the supercapacitor's charge storage capacity, the device of this invention controls the energy flow direction through a power optimization controller, thereby switching the energy direction of the high-power bidirectional wireless charging system. Operating Condition 1: When the launch equipment needs to be charged, such as Figure 3 As shown, the power optimization controller adjusts the forward power transmission to supply power to the vehicle equipment and charge the energy storage battery with appropriate power according to the energy storage battery voltage; when the wireless charging position is reached, the WPT system adjusts the forward high-power power transmission to charge the supercapacitor with high power.

[0021] When the carrier equipment needs to discharge, such as Figure 4 As shown, the power optimization controller is adjusted to reverse power transmission, the energy storage battery supplies power to the vehicle and charges the supercapacitor with appropriate power; when the wireless charging position is reached, the WPT system is adjusted to reverse high-power power transmission.

[0022] When the transport equipment needs to maintain battery power, such as Figure 5 As shown, the power optimization controller is adjusted to transmit power forward, and the output voltage of the power optimization controller is adjusted according to the energy storage battery voltage to power the vehicle equipment; when the wireless charging position is reached, the WPT system is adjusted to transmit high-power power forward.

[0023] like Figure 6 As shown, the power optimization controller switches between cascade buck-boost mode and series voltage compensation mode based on the energy flow direction and the supercapacitor voltage.

[0024] Operating Condition 2: Based on operating condition 1, such as Figure 7 As shown, according to the device of the present invention, when the supercapacitor voltage is high enough, the power optimization controller switches to a cascaded buck-boost mode.

[0025] Operating Condition 3: Based on operating condition 1, such as Figure 8 As shown, according to the device of the present invention, when the supercapacitor voltage is low and the power optimization controller is outputting in the positive direction, the power optimization controller switches to series voltage compensation mode.

[0026] Example 2: This invention provides a power buffering method for high-power bidirectional wireless charging devices, used to control the power buffering system as described in Embodiment 1, comprising: S10, according to external instructions, the target operating mode of the energy storage battery is obtained through the transport equipment; wherein, the target operating mode includes charging mode, discharging mode and power retention mode; S20, based on the target operating mode and the real-time voltage of the supercapacitor, the power optimization controller performs operating mode and output voltage adjustment processing; wherein, the operating mode includes cascade buck-boost mode and series voltage compensation mode; S30, based on the target operating mode and the real-time voltage of the supercapacitor, the bidirectional wireless charging module controls the direction and power of power transmission.

[0027] Furthermore, when the target operating mode is the charging mode, S20 includes: S210, if the real-time voltage of the supercapacitor is higher than the first preset threshold, the power optimization controller executes the cascade buck-boost mode to power the vehicle equipment using the supercapacitor and to charge the energy storage battery with the first charging power. S211, if the real-time voltage of the supercapacitor is lower than the first preset threshold, the series voltage compensation mode is executed through the power optimization controller to power the vehicle equipment using the supercapacitor and to suspend charging of the energy storage battery.

[0028] Furthermore, when the target operating mode is charging mode and the carrier equipment arrives at the wireless charging location, S30 includes: S310 uses the bidirectional wireless charging module to transmit high-power electrical energy in the forward direction to charge the supercapacitor.

[0029] Furthermore, when the target operating mode is a discharge mode, S20 includes: S220, the power optimization controller executes the reverse power transmission mode, uses the energy storage battery to power the vehicle equipment, and charges the supercapacitor with the second charging power until the supercapacitor voltage is higher than the second preset threshold.

[0030] Furthermore, when the target operating mode is discharge mode and the carrier equipment arrives at the wireless charging location, S30 includes: S320, reverse high-power power transmission is performed through the bidirectional wireless charging module, and power is fed to the grid side using the supercapacitor. At the same time, according to S220, the energy storage battery continues to charge the supercapacitor with the second charging power.

[0031] Furthermore, when the target operating mode is the power retention mode, S20 includes: S230, the output voltage of the power optimization controller is matched with the voltage of the energy storage battery, and the power optimization controller is controlled to select the corresponding operating mode according to the real-time voltage of the supercapacitor.

[0032] Furthermore, S230 includes: S231, if the real-time voltage is higher than the third preset threshold, the cascaded buck-boost mode is executed by the power optimization controller; S232, if the real-time voltage is lower than the third preset threshold, the power optimization controller operates in series voltage compensation mode.

[0033] Operating Condition 1: After the vehicle receives a charging command from the energy storage battery, before reaching the next grid-side wireless charging system: When the supercapacitor is under medium to high voltage, as shown in step S210, the power optimization controller enables the supercapacitor to supply power to the carrier equipment in a cascaded buck-boost mode and to charge the energy storage battery with appropriate power, thereby achieving priority consumption of the electrical energy stored in the supercapacitor. When the supercapacitor is under low voltage, as shown in step S211, the power optimization controller enables the supercapacitor to supply power to the carrier equipment in a series compensation voltage mode, and the energy storage battery is not charged at this time.

[0034] Upon reaching the grid-side wireless charging system, as shown in step S310, the supercapacitor is charged at high power via the wireless charging system while it is operating at a low voltage. Simultaneously, when the supercapacitor is at a low voltage, the vehicle equipment is powered and the energy storage battery is charged at an appropriate power, as shown in the steps. When the supercapacitor is at a medium to high voltage, it is charged at a high power via a wireless charging system. (The last sentence is a repetition of the previous one and can be omitted.)

[0035] When the carrier equipment receives a power supply command to the grid, the energy storage battery charges the supercapacitor with appropriate power according to step S220 until the voltage of the supercapacitor is above that of the supercapacitor. When it arrives at the grid-side wireless charging system, the energy storage battery continues to charge the supercapacitor with appropriate power as needed according to step S320. The supercapacitor then feeds power back to the grid side through the high-power wireless charging system.

[0036] When the vehicle receives a command to maintain the battery power, if the supercapacitor is at a medium to high voltage, the power optimization controller, in step S230, enables the supercapacitor to supply power to the vehicle in a cascaded buck-boost mode. If the supercapacitor is at a low voltage, as shown in step S231, the power optimization controller enables the supercapacitor to supply power to the vehicle in a series compensation voltage mode, and adjusts the output voltage to be comparable to the battery voltage, so that the battery does not participate in energy exchange.

[0037] Upon reaching the grid-side wireless charging system, if the supercapacitor is operating at low voltage, it is charged at high power via the wireless charging system. Simultaneously, while the supercapacitor is operating at low voltage, the vehicle equipment is powered according to step S232, adjusting the output voltage to be comparable to the energy storage battery voltage, so that the energy storage battery does not participate in energy exchange. If the supercapacitor is operating at medium to high voltage, it is charged at high power via the wireless charging system. Simultaneously, while the supercapacitor is operating at low voltage, the vehicle equipment is powered, adjusting the output voltage to be comparable to the energy storage battery voltage, so that the energy storage battery does not participate in energy exchange.

[0038] Example 3: This embodiment also provides a computer storage medium, in which a computer program is stored, and when the computer program is executed by one or more processors, it implements the method of embodiment one. The computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0039] The method implemented in this embodiment is as described in Embodiment 2.

[0040] In the several embodiments provided in this invention, it should be understood that the disclosed systems and methods can also be implemented in other ways. The system and method embodiments described above are merely illustrative.

[0041] It should be noted that, in this document, the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A power buffer system for high-power bidirectional wireless charging devices, characterized in that, Includes a bidirectional wireless charging module and a power buffer management module; The bidirectional wireless charging module includes a bidirectional inverter / rectifier, a compensation network, and a coupling mechanism; the bidirectional inverter / rectifier and the coupling mechanism are connected through the compensation network. The power supply side and equipment side of the bidirectional wireless charging system are respectively equipped with bidirectional wireless charging modules, and the power supply side and equipment side are connected by the coupling mechanism corresponding to their respective bidirectional wireless charging modules. The power buffer management module includes a supercapacitor and a power optimization controller; the power optimization controller is connected to the inverter / rectifier on the equipment side via the supercapacitor; the equipment side is connected to the energy storage battery via the power optimization controller; wherein... The power optimization controller includes a bidirectional DC-DC converter and a connection structure switching branch.

2. The power buffer system according to claim 1, characterized in that, The power optimization controller includes a bidirectional DC-DC converter and a connection structure switching branch; wherein, the connection structure switching branch includes a power switching device and a compensation capacitor; when the power switching device is turned on, the supercapacitor and the DC-DC converter are in a cascaded mode; when the power switching device is turned off, the supercapacitor and the DC-DC converter are in a series mode, and the DC-DC converter is connected in series with the supercapacitor through the compensation capacitor.

3. A power buffering method for high-power bidirectional wireless charging devices, characterized in that, The control method for controlling the power buffer system as described in claims 1 and 2 includes: S10, according to external instructions, the target operating mode of the energy storage battery is obtained through the transport equipment; wherein, the target operating mode includes charging mode, discharging mode and power retention mode; S20, based on the target operating mode and the real-time voltage of the supercapacitor, the power optimization controller performs operating mode and output voltage adjustment processing; wherein, the operating mode includes cascade buck-boost mode and series voltage compensation mode; S30, based on the target operating mode and the real-time voltage of the supercapacitor, the bidirectional wireless charging module controls the direction and power of power transmission.

4. The control method according to claim 3, characterized in that, When the target operating mode is charging mode, S20 includes: S210, if the real-time voltage of the supercapacitor is higher than the first preset threshold, the power optimization controller executes the cascade buck-boost mode to power the vehicle equipment using the supercapacitor and to charge the energy storage battery with the first charging power. S211, if the real-time voltage of the supercapacitor is lower than the first preset threshold, the series voltage compensation mode is executed through the power optimization controller to power the vehicle equipment using the supercapacitor and to suspend charging of the energy storage battery.

5. The control method according to claim 4, characterized in that, When the target operating mode is charging mode and the vehicle reaches the wireless charging location, S30 includes: S310 uses the bidirectional wireless charging module to transmit high-power electrical energy in the forward direction to charge the supercapacitor.

6. The control method according to claim 3, characterized in that, When the target operating mode is the discharge mode, S20 includes: S220, the power optimization controller executes the reverse power transmission mode, uses the energy storage battery to power the vehicle equipment, and charges the supercapacitor with the second charging power until the supercapacitor voltage is higher than the second preset threshold.

7. The control method according to claim 6, characterized in that, When the target operating mode is discharge mode and the carrier equipment arrives at the wireless charging location, S30 includes: S320, reverse high-power power transmission is performed through the bidirectional wireless charging module, and power is fed to the grid side using the supercapacitor. At the same time, according to S220, the energy storage battery continues to charge the supercapacitor with the second charging power.

8. The control method according to claim 3, characterized in that, When the target operating mode is the power retention mode, S20 includes: S230, the output voltage of the power optimization controller is matched with the voltage of the energy storage battery, and the power optimization controller is controlled to select the corresponding operating mode according to the real-time voltage of the supercapacitor.

9. The control method according to claim 8, characterized in that, S230 includes: S231, if the real-time voltage is higher than the third preset threshold, the cascaded buck-boost mode is executed by the power optimization controller; S232, if the real-time voltage is lower than the third preset threshold, the power optimization controller operates in series voltage compensation mode.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, is used to implement the control method as described in any one of claims 3-9.

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