Electric energy supply device

Abstract

An electric energy supply device comprises an electric energy storage unit, a DC-AC conversion circuit, a DC side of which is electrically connected with the electric energy storage unit; the output port is electrically connected with the alternating current side of the direct current-alternating current conversion circuit and is electrically connected with electric energy receiving equipment through a wire harness; the communication circuit is in communication connection with the electric energy receiving equipment; the controller is electrically connected with the DC-AC conversion circuit and the communication circuit; the direct-current and alternating-current conversion circuit is configured to respond to communication between the electric energy supply equipment and the electric energy receiving equipment and meet a preset charging condition, and the direct-current and alternating-current conversion circuit receives an instruction of the controller to work in a direct-through mode so as to establish a direct-current transmission path between the electric energy supply equipment and the electric energy receiving equipment; wherein the straight-through mode is defined as follows: the electric energy of the electric energy supply equipment is output in a direct-current mode at the alternating-current side of the direct-current and alternating-current conversion circuit; the preset charging condition comprises that at least one of the electric energy providing equipment and the electric energy receiving equipment comprises a DC-DC conversion circuit.

Description

Technical field

[0004] When a power-providing device charges another power-receiving device, it must first convert its internally stored DC power into AC power for output, while the receiving device must then convert the received AC power back into DC power for charging. This dual "DC-AC-DC" conversion path increases the number of energy conversion steps, resulting in additional energy loss and reducing overall charging efficiency.

[0005] To this end, the inventors of this application have developed an electric energy supply device. The electric energy supply device includes: an electric energy storage unit; a DC-AC conversion circuit, the DC side of the DC-AC conversion circuit being electrically connected to the electric energy storage unit; an output port electrically connected to the AC side of the DC-AC conversion circuit, the output port being configured to be electrically connected to an electric energy receiving device via a wiring harness; a communication circuit configured to establish a communication connection with the electric energy receiving device; and a controller electrically connected to the DC-AC conversion circuit and the communication circuit. The DC-AC conversion circuit is configured to: in response to the electric energy supply device communicating with the electric energy receiving device and satisfying a preset charging condition, the DC-AC conversion circuit receives a command from the controller and operates in a pass-through mode to establish a DC transmission path between the electric energy supply device and the electric energy receiving device. The pass-through mode is defined as: the electric energy of the electric energy supply device is output in a DC manner on the AC side of the DC-AC conversion circuit; and the preset charging condition includes: at least one of the electric energy supply device and the electric energy receiving device includes a DC-DC conversion circuit.

[0006] The above-mentioned power providing device communicates with the corresponding power receiving device through a communication circuit. When it is determined that the currently formed power transmission path meets the pre-set charging conditions, it can control the DC-AC conversion circuit of the power providing device to operate in a direct-through mode, so that the power is transmitted between the power providing device and the power receiving device in a DC form, avoiding unnecessary energy conversion process, thereby significantly reducing the loss caused by the change of energy form and improving the overall charging efficiency.

[0007] In combination with the first aspect, in a possible implementation, it further includes: a DC-DC conversion circuit; the input end of the DC-DC conversion circuit is electrically connected to the electric energy storage unit, and the output end of the DC-DC conversion circuit is electrically connected to the DC side of the DC-AC conversion circuit.

[0008] This DC-DC converter circuit regulates or stabilizes the DC power output by the energy storage unit to meet the input requirements of the DC-AC converter circuit, improving the adaptability of the energy-providing device to different operating voltage ranges. Furthermore, the DC-DC converter circuit adjusts the output voltage to meet the charging needs of the energy-receiving device.

[0009] In combination with the first aspect, or any one of the foregoing possible implementations of the first aspect, in another possible implementation, the electric energy storage unit includes a battery module or a photovoltaic assembly.

[0010] In combination with the first aspect, or any one of the above-mentioned possible implementations of the first aspect, in another possible implementation, when the electric energy storage unit includes a battery module, the electric energy providing device further includes: an input port, electrically connected to the DC-AC conversion circuit, and the input port is configured to be electrically connected to the charging device through a wiring harness; the controller is further configured to: obtain identification information of the charging device through the communication circuit; and determine that the electric energy providing device is in a self-charging state in response to the identification information of the charging device being consistent with the identification information of the electric energy providing device.

[0011] The identification information sent by the control logic and communication circuit of the above-mentioned controller can effectively identify that the output port of the power supply device is incorrectly connected to its own input port due to misoperation or connection error, forming a closed-loop self-charging state.

[0012] This automatic identification process can promptly detect abnormal connections in the self-charging state before charging, effectively avoiding the energy waste and safety risks caused by self-charging, and enhancing the user experience of power supply equipment in multi-device connections or complex application scenarios.

[0013] In combination with the first aspect, or any one of the above-mentioned possible implementations of the first aspect, in another possible implementation, the controller is further configured to: feed back the maximum discharge power of the power providing device to the power receiving device through the communication circuit, so that the power receiving device adjusts its own target charging power not to exceed the maximum discharge power; the DC-AC conversion circuit is configured to: receive instructions from the controller to operate in the pass-through mode or the inverter mode, and provide power to the power receiving device at the target charging power; wherein the inverter mode is defined as: the power of the power providing device is output in an AC manner on the AC side of the DC-AC conversion circuit.

[0014] Through communication between the power provider and the power receiver, the power receiver dynamically adjusts its target charging power based on the maximum discharge capacity of the power provider, ensuring that the target power does not exceed the discharge capacity of the power provider. This power matching mechanism effectively prevents overcurrent, overheating, or other protection mechanisms of the power provider from being triggered due to power overload, thereby improving the stability and safety of the charging process.

[0015] In combination with the first aspect, or any one of the above-mentioned possible implementations of the first aspect, in another possible implementation, the communication circuit includes a power line communication component; the power line communication component is configured to: transmit a carrier signal through the wiring harness to establish a communication connection with the power receiving device.

[0016] Power line communication (PLC) enables communication between power-providing and power-receiving devices by utilizing existing wiring harnesses for both energy transmission and communication, without requiring separate communication cables. This reduces the number of cables required, lowering wiring complexity and assembly costs.

[0017] In combination with the first aspect, or any one of the above-mentioned possible implementations of the first aspect, in another possible implementation, the power line communication component includes: a data processing unit, electrically connected to the controller, and the data processing unit is configured to: encapsulate the information from the controller into corresponding transmission data; a modulation unit, electrically connected to the data processing unit, and the modulation unit is configured to: modulate the transmission data into a carrier signal with a target frequency, and send it through the wiring harness; a demodulation unit, electrically connected to the data processing unit, and the demodulation unit is configured to: demodulate the acquired carrier signal, extract the received data and transmit it to the data processing unit; the data processing unit is also configured to: parse the received data and provide the parsing result to the controller.

[0018] In combination with the first aspect, or any one of the foregoing possible implementations of the first aspect, in yet another possible implementation, the communication circuit is a wireless communication component.

[0019] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in another possible implementation, the DC-AC conversion circuit includes: an inverter switch unit, including a plurality of switches adopting a preset topology; a first capacitor, wherein a first end of the first capacitor is electrically connected to a first connection terminal of the inverter switch unit, a second end of the first capacitor is electrically connected to a second connection terminal of the inverter switch unit, and the first and second ends of the first capacitor are a DC side of the DC-AC conversion circuit; a second capacitor and an inductor, wherein a first end of the inductor is electrically connected to a third connection terminal of the inverter switch unit, a second end of the inductor is electrically connected to a first end of the second capacitor, and a second end of the second capacitor is electrically connected to a fourth connection terminal of the inverter switch unit, and the first and second ends of the second capacitor are an AC side of the DC-AC conversion circuit; the DC-AC conversion circuit further includes: a switch controller, electrically connected to the controller and the switch, respectively, the switch controller being configured to drive the switch to be turned on or off; or a drive circuit, electrically connected to the controller and the switch, respectively, the drive circuit being configured to convert a switch control signal from the controller into a switch drive signal to drive the switch to be turned on or off.

[0020] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in another possible implementation, the inverter switch unit includes: a first switch, a second switch, a third switch, and a fourth switch; wherein the first end of the first switch is connected to the first end of the second switch, the second end of the first switch is connected to the first end of the third switch, the second end of the second switch is connected to the first end of the fourth switch, and the second end of the fourth switch is connected to the second end of the third switch; a common connection node between the first end of the first switch and the first end of the second switch forms the first connection end of the inverter switch unit, and a common connection node between the second end of the third switch and the second end of the fourth switch forms the second connection end of the inverter switch unit; a common connection node between the second end of the first switch and the first end of the third switch forms the third connection end of the switch unit; and a common connection node between the second end of the second switch and the first end of the fourth switch forms the fourth connection end of the switch unit; and when the DC-AC conversion circuit is in the pass-through mode, the second switch and the third switch remain on, and the first switch and the fourth switch remain off, or the second switch and the third switch remain off, and the first switch and the fourth switch remain on.

[0021] The first ends of the first switch and the second switch are connected to form the DC input positive electrode, and the second ends of the third switch and the fourth switch are connected to form the DC input negative electrode; the common node between the first switch and the third switch serves as the first output terminal on the AC side, and the common node between the second switch and the fourth switch serves as the second output terminal on the AC side. This connection method has good symmetry and topological stability, which facilitates the implementation of standard industrial frequency inverter control.

[0022] Moreover, the DC-AC conversion circuit can conveniently realize flexible switching between the direct mode and the inverter mode through the conduction control strategy of the first switch, the second switch, the third switch and the fourth switch.

Brief Description of the Drawings

[0024] Figure 1 This is a schematic diagram of a typical power supply scenario; Figure 2 A schematic diagram of an electric energy supply device provided in an embodiment of the present application; Figure 3 A schematic diagram of an electric energy supply device provided in another embodiment of the present application; Figure 4 A schematic diagram of a communication circuit of an electric energy providing device provided in an embodiment of the present application; Figure 5 A schematic diagram of establishing a communication connection for an electric energy providing device provided in an embodiment of the present application; Figure 6 A schematic diagram of a DC-AC conversion circuit of an electric energy providing device provided in an embodiment of the present application; Figure 7 A schematic diagram of a DC-AC conversion circuit provided in an embodiment of the present application, illustrating a case where a switch controller is used; Figure 8 A schematic diagram of a DC-AC conversion circuit provided in another embodiment of the present application, showing the use of a drive circuit; Figure 9 A schematic diagram showing an electrical connection between a power supply device and a power receiving device provided in an embodiment of the present application via a wiring harness; Figure 10 A schematic diagram of a DC transmission path formed by a power supply device and a power receiving device provided in an embodiment of the present application; Figure 11 A schematic diagram of a DC transmission path formed by a power providing device and a power receiving device provided in another embodiment of the present application. [Specific implementation method] In order to facilitate the understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments.

[0026] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intervening element, or it can refer to the two elements being connected through signal interaction. When an element is considered to be "coupled" / "coupled to" another element, it can be directly coupled to the other element or there can be an intervening element, or it can refer to the two elements interacting through signals.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0028] "Power supply equipment" refers to equipment that has power output function and can output and provide power to other equipment or loads, including but not limited to energy storage power supplies, photovoltaic inverters and power adapters.

[0029] "Power receiving device" refers to an electronic device that can receive and consume electrical energy, including but not limited to energy storage power supplies and power-consuming equipment.

[0030] It is understood that the terms "power supply device" and "power receiving device" are used only to describe the functional roles of electronic devices in power usage scenarios, and are not intended to limit the devices themselves. If an electronic device has both power output and power consumption functions, whether it is a power receiving device or a power supply device depends on the specific power usage scenario.

[0031] Figure 1 This is a schematic diagram of a typical power supply scenario. Figure 1 As shown, the power supply scenario includes two electronic devices. One of the electronic devices is a power supply device 10, which is used to output and provide power. The other electronic device is a power receiving device 20, which is used to receive and consume power.

[0032] An electrical connection is established between the power providing device 10 and the power receiving device 20 via the wiring harness 30 , forming a power transmission path, so that the power output by the power providing device 10 is received by the power receiving device 20 .

[0033] When the power supply device 10 outputs power to charge the power receiving device 20, the power supply device 10 first needs to convert its own DC power into AC power and then transmit it to the power receiving device 20 through the wiring harness 30. The power receiving device 20 then converts the received AC power into DC power to charge its own energy storage unit.

[0034] This charging process involves "DC-AC-DC" energy conversion. Applicants have discovered that in some scenarios, such as when either or both of the power supply device 10 and the power receiving device 20 have DC voltage conversion capabilities, this energy conversion step is unnecessary. The power supply device 10 directly provides power to the power receiving device 20 in the form of DC power. Therefore, this unnecessary energy conversion step results in additional energy loss and reduces power utilization efficiency.

[0035] To further improve the efficiency of energy utilization during charging, the applicant has developed and designed a communication circuit within the power supply device 10. Using this communication circuit, the power supply device 10 first communicates with the power receiving device 20, with which it is already electrically connected, to determine whether it has a DC voltage conversion function. If this function is confirmed, the power supply device 10 no longer outputs power in the form of AC power, but instead directly supplies DC power to the power receiving device 20, thereby charging the power receiving device 20.

[0036] Accordingly, the electric energy provided by the electric energy providing device 10 is provided to the electric energy receiving device 20 in a DC form without the need for energy conversion, thereby avoiding losses caused by changes in energy form and improving the overall electric energy utilization efficiency.

[0037] An embodiment of the present application provides an electric energy providing device, which is designed based on the above-mentioned inventive concept and adaptively selects to output direct current or alternating current according to whether the current charging scenario meets preset charging conditions.

[0038] Based on the same design concept, the power supply device is applied to various types of electronic devices, so that when these electronic devices are used as power supply devices to supply power to the outside, the technical effect of avoiding loss caused by changes in energy form is achieved.

[0039] Figure 2 This is a schematic diagram of the power supply device provided in the embodiment of the present application. Figure 2 As shown, the electric energy providing device 10 includes: an electric energy storage unit 11 , a DC to AC conversion circuit 12 , an output port 13 , a communication circuit 14 and a controller 15 .

[0040] The power storage unit 11 is a functional unit for storing electric energy, which has the ability to convert various forms of energy (eg, light energy, chemical energy, etc.) into electric energy, so that the power supply device 10 can supply power externally.

[0041] Specifically, the energy storage unit 11 may have different implementations based on the actual application of the energy supply device 10. For example, when the energy supply device 10 is an energy storage device, the energy storage unit 11 includes a battery module, while when the energy supply device 10 is a photovoltaic inverter, the energy storage unit includes a photovoltaic module.

[0042] The DC-AC conversion circuit 12 is a functional circuit for realizing the conversion of electric energy forms, converting DC power into AC power, or converting AC power into DC power.

[0043] In this application, the term "DC side" is used to refer to the connection terminal in a functional circuit for outputting or receiving DC power, and the term "AC side" is used to refer to the connection terminal in a functional circuit for outputting or receiving AC power.

[0044] In some embodiments, the DC-AC converter circuit 12 is a circuit with bidirectional conversion capabilities. In other words, the DC-AC converter circuit 12 inverts DC power input from the DC side into AC power output on the AC side, and rectifies AC power input from the AC side into DC power output on the DC side.

[0045] In this embodiment, the DC-AC converter circuit 12, in addition to supporting the basic AC-DC or DC-AC conversion functions described above, also allows electrical energy to pass directly without changing its form. This function of allowing electrical energy to pass directly without changing its form is hereinafter referred to as "pass-through mode," while the function of inverting DC power input from the DC side into AC power output on the AC side is referred to as "inversion mode."

[0046] In other words, in the through mode, the power of the power supply device is output in the form of direct current on the AC side of the DC-AC conversion circuit.

[0047] Output port 13 is a connection port for outputting electrical energy. Within power supply device 10, output port 13 is electrically connected to the AC side of DC-AC conversion circuit 12. Therefore, when DC-AC conversion circuit 12 operates in direct-flow mode and its AC side outputs DC power, the electrical energy outputted from output port 13 is also DC power. The output port 13 has a port structure that is compatible with the end of the wiring harness 30, enabling the wiring harness 30 to establish an electrical connection between the aforementioned power supply device 10 and the power receiving device 20 through structural physical contact. The specific port structure is set according to actual needs and is not specifically limited here.

[0048] The communication circuit 14 is a functional circuit for establishing a communication connection with an external device. By utilizing the communication connection formed by the communication circuit 14, the power supply device 10 and the power receiving device 20 can communicate with each other and exchange data.

[0049] The controller 15 is a functional unit for controlling and managing various functional circuits. The controller 15 is electrically connected to the DC / AC conversion circuit 12 and the communication circuit 14 , and controls and adjusts the operating mode of the DC / AC conversion circuit 12 based on the communication and data exchange results of the communication circuit 14 .

[0050] In actual application, in response to the communication between the power providing device 10 and the power receiving device 20, and when the controller 15 determines that the preset charging conditions are met based on the communication results, it will send an instruction to the DC-AC conversion circuit 12 to make it work in the direct-through mode.

[0051] The DC-AC conversion circuit 12 operating in the through mode establishes a DC transmission path between the power supply device 10 and the power receiving device 20, so that power is provided to the power receiving device in the form of DC power for charging.

[0052] The preset charging condition is the minimum equipment requirement that needs to be met when the charging circuit formed by the power supply device and the power receiving device is capable of DC charging. For example, the charging system has the function of DC power regulation.

[0053] Specifically, the preset charging condition includes: at least one of the power providing device 10 and the power receiving device 20 includes a DC-DC conversion circuit.

[0054] The DC-DC converter circuit is a functional circuit for converting one DC voltage / current value to another DC voltage / current value. The specific type of the converter circuit is selected by the skilled person based on actual application requirements and includes, but is not limited to, a buck converter, a boost converter, a buck-boost converter, and a push-pull converter, and is not specifically limited here.

[0055] Therefore, when at least one of the power providing device 10 and the power receiving device 20 includes a DC-DC conversion circuit, the charging system they constitute has the function of adjusting DC power, and adjusts the DC power to the target charging voltage or current through the DC-DC conversion circuit to meet the charging needs of the power receiving device 20.

[0056] In some embodiments, please refer to Figure 2 The power supply device 10 itself includes a DC-DC conversion circuit 16.

[0057] Among them, the input end of the DC-DC conversion circuit 16 belonging to the power supply device 10 itself is electrically connected to the power storage unit 11, and the output end thereof is electrically connected to the DC side of the DC-AC conversion circuit 12, so as to convert the DC power provided by the power storage unit 11 into a suitable DC voltage / current value and then provide it to the DC-AC conversion circuit 12.

[0058] Figure 3 This is a schematic diagram of an electric energy supply device provided by another embodiment of the present application. It shows a case where the electric energy storage unit 11 includes a battery module. Figure 3 As shown, the power supply device 10 has Figure 2 In addition to the functional units shown, it also includes: an input port 17.

[0059] The input port 17 is a connection port for receiving external power. Inside the power supply device 10, the input port 17 is electrically connected to the DC-AC conversion circuit 12, so that the received external power is converted into the required power form after being processed by the DC-AC conversion circuit 12.

[0060] The input port 17 also has a port structure corresponding to the end of the wiring harness 30 , establishes a plug-in relationship with the wiring harness 30 , and establishes an electrical connection with another external electronic device through the wiring harness 30 .

[0061] It should be noted that when the input port 17 of the power supply device establishes an electrical connection with another electronic device through the wiring harness 30 , the power supply device now has the function of receiving power (ie serves as a power receiving device).

[0062] In many application scenarios, multiple different electronic devices are connected via a wiring harness to serve as power supply devices or power receiving devices. If the operator is not careful enough, the output port 13 of the power supply device may be mistakenly connected to the input port 17 of the power supply device via the wiring harness 30, for example, in complex application scenarios with multiple electronic devices.

[0063] In this misconnected state, the power supply device forms a closed circuit, and the power it outputs is used to charge itself, resulting in energy waste and certain safety risks. For ease of description, this closed-circuit misconnection will be referred to as the "self-charging state."

[0064] In some embodiments, in order to promptly identify and process this self-charging state, when the input port 17 of the power providing device is electrically connected to an external charging device through a wiring harness 30, the controller 15 is configured to: obtain the identification information of the charging device through the communication circuit 14, and determine whether the current power providing device is in a self-charging state based on whether the identification information of the charging device is consistent with the identification information of the power providing device.

[0065] When the two are consistent, it indicates that the charging device and the power supply device are the same device, and the controller determines that the power supply device is in a self-charging state. When the two are inconsistent, it indicates that the power supply device is in a normal discharge state, and the electric energy stored in the battery module is output to other electronic devices through the output port.

[0066] The identification information refers to information used to distinguish and identify different electronic devices, including but not limited to device serial numbers, model codes, and product identification codes, which are not specifically limited here.

[0067] The device identification recognition and judgment method using the communication circuit 14 can timely detect abnormal connections in the self-charging state before charging, effectively avoiding the energy waste and safety risks caused by self-charging, and enhancing the user experience of the power providing device in multiple device connections or complex application scenarios.

[0068] In many power supply scenarios, different electronic devices have different discharge and charge powers based on different design goals. For example, some small energy storage devices have lower charge and discharge powers, while some large energy storage devices have higher charge and discharge powers.

[0069] When a small energy storage device charges a large energy storage device, the charging efficiency required by the large energy storage device is greater than that of the small energy storage device as an electric energy provider, which will cause the output power of the small energy storage device to overload, thereby triggering the device's overcurrent or overheating protection mechanism.

[0070] In some embodiments, in order to ensure that different types of energy storage devices can charge each other stably and reliably, when the power providing device 10 is in a discharging state, the controller 15 is configured to: feedback the maximum discharge power of the power providing device 10 to the power receiving device 20 through the communication circuit 14, so that the power receiving device 20 adjusts its own target charging power not to exceed the maximum discharge power.

[0071] Accordingly, the DC-AC conversion circuit 12 is configured to receive an instruction from the controller 15 to operate in a through-mode or an inverter mode, and provide electric energy to the electric energy receiving device 20 at a target charging power.

[0072] The "maximum discharge power" refers to the maximum power output of the power-providing device in its current state. This is determined by one or more practical limiting factors, including but not limited to the remaining charge of the energy storage unit, the device's heat dissipation capabilities, and the rated power of circuit components. The "target charging power" refers to the charging power value that the power-receiving device expects to receive.

[0073] By utilizing the communication connection established by the communication circuit 14, the maximum discharge power and the target charging power are negotiated between the power providing device 10 and the power receiving device 20, thereby achieving power matching between the power providing device and the power receiving device, thereby ensuring the safe and efficient charging process.

[0074] This target charging power adjustment method ensures that the target power requested by the power receiving device does not exceed the discharge capacity of the power providing device, effectively avoiding the triggering of overcurrent, overheating or other protection mechanisms of the power providing device due to output power overload, and improving the stability and safety of the charging process.

[0075] Figure 4 Schematic diagram of a communication circuit provided in an embodiment of the present application. In some embodiments, as Figure 4 As shown, the communication circuit 14 includes a power line communication component 14a.

[0076] The power line communication component 14a is a functional circuit that uses physical connection wires to transmit carrier signals to establish a communication connection. It uses a wiring harness 30 inserted between the power supply device 10 and the power receiving device 20 to transmit carrier signals to establish a communication connection between the two devices.

[0077] For example, Figure 5 As shown, when the output port 13 of the power providing device 10 establishes an electrical connection with the power receiving device 20 through the first wire harness 30a, the power line communication component 14a establishes a communication connection with the power receiving device 20 by transmitting a carrier signal through the first wire harness 30a.

[0078] When the power supply device 10 also has an input port 17, and its input port 17 establishes an electrical connection with another charging device 40 that provides power to the power supply device through the second wiring harness 30b, the power line communication component 14a establishes a communication connection with the charging device 40 by transmitting a carrier signal through the second wiring harness 30b.

[0079] For details, please refer to Figure 4 The power line communication component includes: a data processing unit 141, a modulation unit 142 and a demodulation unit 143.

[0080] The data processing unit 141 is a functional unit for processing communication data and is electrically connected to the controller 15 to encapsulate information from the controller into corresponding transmission data, analyze the received data, and provide the analysis results to the controller.

[0081] The modulation unit 142 is a functional unit that modulates the transmission data onto a carrier wave. It is electrically connected to the data processing unit 141 and is used to modulate the transmission data into a carrier wave signal with a target frequency and transmit it through the wiring harness.

[0082] Specifically, the modulation unit 142 modulates the transmission data onto the carrier signal using one or more modulation methods such as amplitude modulation, frequency modulation, and phase modulation. The specific modulation method selected is determined by actual needs and is not specifically limited here.

[0083] The demodulation unit 143 is a functional unit that converts the received carrier signal into received data. It is electrically connected to the data processing unit and is used to demodulate the acquired carrier signal, extract the received data from it, and transmit it to the data processing unit.

[0084] When the power supply device 10 needs to transmit information via the power line communication component, the data processing unit 141 first encapsulates the information to be transmitted into corresponding transmission data. The modulation unit 142 then modulates the encapsulated transmission data into a carrier signal with a target frequency, which is then transmitted to the power receiving device via the wiring harness 30, thereby transmitting the information.

[0085] On the other hand, when the power supply device receives external information through the power line communication component, the demodulation unit 143 first demodulates the acquired carrier signal to extract the received data. Then, the data processing unit 141 parses the received data and provides the parsed information to the controller, thereby enabling the power supply device to receive external information.

[0086] Alternatively, in some other embodiments, the communication circuit 14 includes a wireless communication component. The wireless communication component refers to a functional circuit that completes the communication connection between different electronic devices without relying on physical connection (for example, propagating signals in space through electromagnetic waves).

[0087] The wireless communication components used include Bluetooth, WiFi, and ZigBee wireless communication components, which are determined according to the needs of the actual application scenario and are not limited here.

[0088] Figure 6 This is a schematic diagram of a DC-AC conversion circuit provided in an embodiment of the present application. It exemplarily shows the basic structural components of the DC-AC conversion circuit 12. Figure 6 As shown, the DC-AC conversion circuit 12 includes: an inverter switch unit 121, a first capacitor C1, a second capacitor C2 and an inductor L.

[0089] The inverter switch unit 121 is a power unit that converts electrical energy into different forms. It includes multiple switches in a preset topology. By controlling the on / off timing of each switch in the inverter switch unit 121, the DC-AC conversion circuit 12 operates in various modes (for example, an inverter mode that converts DC to AC, a rectifier mode that converts AC to DC, or a pass-through mode that allows DC to pass directly). The inverter switch unit 121 includes a first connection terminal 121a, a second connection terminal 121b, a third connection terminal 121c, and a fourth connection terminal 121d.

[0090] The first end of the first capacitor C1 is electrically connected to the first connection terminal 121a of the inverter switch unit 121, and the second end of the first capacitor C1 is connected to the second connection terminal 121b. The first and second ends of the first capacitor C1 serve as the DC side DC of the DC-AC conversion circuit 12.

[0091] A first end of the inductor L is electrically connected to the third connection terminal 121c of the inverter switch unit 121. A second end of the inductor L is electrically connected to the first end of the second capacitor C2. The second end of the second capacitor C2 is electrically connected to the fourth connection terminal 121d. The first and second ends of the second capacitor C2 serve as the AC side AC of the DC-AC conversion circuit.

[0092] In this application, "topology" refers to the electrical connection method and arrangement of switches, including but not limited to half-bridge, full-bridge, and push-pull structures. The appropriate topology is selected based on actual needs.

[0093] In some embodiments, in order to realize the control of the on and off cycles of multiple switches in the inverter switch unit 121, as shown in FIG. Figure 7 As shown, the DC-AC conversion circuit further includes: a switch controller 122 .

[0094] The switch controller 122 is a control component independent of the controller 15. It is electrically connected to the controller and the switch, and is used to generate corresponding control signals to drive the switch to be turned on or off, so that the inverter switch unit 121 operates in the inverter mode, the direct-flow mode or the rectifier mode.

[0095] In other embodiments, other methods of driving the switch on and off are used, such as Figure 8 As shown, the DC-AC conversion circuit further includes a drive circuit 123 .

[0096] The driving circuit 123 is a functional circuit for realizing voltage level conversion, so as to convert a low-level control signal into a high-level driving signal suitable for driving a switch.

[0097] The drive circuit 123 is electrically connected to the controller and the switch, respectively, and is used to convert the switch control signal from the controller 15 into a switch drive signal with sufficient driving capability, thereby driving the switch to be turned on or off, so that the inverter switch unit 121 operates in the inverter mode, the pass-through mode or the rectification mode.

[0098] For example, Figure 6 The inverter switch unit 121 uses a full-bridge topology. Figure 6 The inverter switch unit includes: a first switch S1, a second switch S2, a third switch S3 and a fourth switch S4.

[0099] The first end of the first switch S1 is connected to the first end of the second switch S2, the second end of the first switch S1 is connected to the first end of the third switch S3, the second end of the second switch S2 is connected to the first end of the fourth switch S4, and the second end of the fourth switch S4 is connected to the second end of the third switch S3.

[0100] The common connection node between the first end of the first switch S1 and the first end of the second switch S2 forms the first connection terminal 121a of the inverter switch unit. The common connection node between the second end of the fourth switch S4 and the second end of the third switch S3 forms the second connection terminal 121b of the inverter switch unit.

[0101] The common connection node between the second end of the first switch S1 and the first end of the third switch S3 forms the third connection terminal 121c of the inverter switch unit, and the common connection node between the second end of the second switch S2 and the first end of the fourth switch S4 forms the fourth connection terminal 121d of the inverter switch unit.

[0102] When the second switch S2 and the third switch S3 are controlled to remain on and the first switch S1 and the fourth switch S4 are controlled to remain off, the DC-AC conversion circuit 12 is in the aforementioned direct-through mode, and the DC power input to the DC end directly passes through the inverter switch unit and is output from the AC end.

[0103] Alternatively, the same effect can be achieved by controlling the second switch S2 and the third switch S3 to remain off and the first switch S1 and the fourth switch S4 to remain on, so that the DC-AC conversion circuit 12 is in the aforementioned through mode.

[0104] To fully describe this application, the following Figures 9 to 11The specific examples of the power receiving device and the power supply device shown provide a detailed description of one or more functions required to be performed by the aforementioned power receiving device. For ease of illustration and description, the same functional circuits or electronic components in the power supply device 10 and the power receiving device 20 are distinguished by the subscripts t and r, respectively.

[0105] like Figure 9 As shown, the output port 13 of the power supply device 10 t and the input port 17 of the power receiving device 20 r The two terminals are connected via a wiring harness 30. The wiring harness 30 includes at least two mutually insulated connecting wires, which serve as a live wire L and a neutral wire N respectively.

[0106] The power supply device 10 is provided with a power line communication component 15 t The power receiving device 20 is also provided with a matching power line communication component 15 r The communication connection between the power supply device 10 and the power receiving device 20 is established by transmitting a carrier signal via the live wire L in the wiring harness 30 .

[0107] Before charging, the power providing device 10 and the power receiving device 20 exchange information to determine whether there is at least one DC-DC conversion circuit in the power providing device 10 and the power receiving device 20 .

[0108] When it is determined that there is at least one DC-DC conversion circuit (for example, Figure 9 There is a DC-DC conversion circuit 16 shown t and / or 16 r ), such as Figure 10 As shown, the power supply device 10 controls the second switch S2 t and the third switch S3 t While keeping it on, control the first switch S1 t and the fourth switch S4 t Stay disconnected.

[0109] At this time, the DC-AC conversion circuit 12 of the power supply device 10 t Running in direct mode, the DC to AC conversion circuit 12 t The DC power input from the DC side is directly converted to DC by the inverter switch unit 121 t , and from the DC to AC conversion circuit 12 t The AC side output is connected to the output port 13 t Output.

[0110] Correspondingly, the power receiving device 20 controls the second switch S2 r and the third switch S3r While keeping it on, control the first switch S1 r and the fourth switch S4 r Stay disconnected.

[0111] At this time, the DC-AC conversion circuit 12r of the power receiving device 20 also operates in the direct mode, and the power is received from the input port 13 r The received DC power is directly converted to AC by the DC-AC conversion circuit 12 r , to charge the battery module of the power receiving device 20.

[0112] Alternatively, when it is determined that there is at least one DC-DC conversion circuit, as Figure 11 As shown, the power supply device 10 controls the second switch S2 t and the third switch S3 t While keeping it open, control the first switch S1 t and the fourth switch S4 t Keep it on.

[0113] At this time, the DC-AC conversion circuit 12 of the power supply device 10 t Running in direct mode, the DC to AC conversion circuit 12 t The DC power input from the DC side is directly converted to DC by the inverter switch unit 121 t , and from the DC to AC conversion circuit 12 t The AC side output is connected to the output port 13 t Output.

[0114] Correspondingly, the power receiving device 20 controls the second switch S2 r and the third switch S3 r While keeping it open, control the first switch S1 r and the fourth switch S4 r Keep it on.

[0115] At this time, the DC-AC conversion circuit 12 of the power receiving device 20 r Also operates in pass-through mode, from input port 13 r The received DC power is directly converted to AC by the DC-AC conversion circuit 12 r , to charge the battery module of the power receiving device 20.

[0116] In addition, when the power supply device 10 and the power receiving device 20 exchange information, in addition to determining whether the preset charging conditions are met (that is, whether there is at least one DC-DC conversion circuit between the power supply device 10 and the power receiving device 20), the aforementioned power matching and automatic identification of the self-charging state are further performed.

[0117] During power matching, the power providing device 10 first provides its maximum discharge power to the power receiving device 20. The power receiving device 20 then adjusts and matches the target charging power based on the received maximum discharge power, ensuring that the target charging power does not exceed the maximum discharge power of the power providing device 10.

[0118] When automatically identifying the self-charging state, the power supply device 10 first requests identification information from the power receiving device 20 through its output port. The power supply device 10 then compares the received identification information from the power receiving device 20 with its own identification information to see if it matches. Finally, if the received identification information from the power receiving device 20 matches its own identification information, the device determines that the device is currently in the incorrectly connected self-charging state.

[0119] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the idea of ​​the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above. For the sake of simplicity, they are not provided in detail. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric energy supply device, characterized in that: include: electrical energy storage units; a DC-AC conversion circuit, wherein the DC side of the DC-AC conversion circuit is electrically connected to the electric energy storage unit; an output port electrically connected to an AC side of the DC to AC conversion circuit, the output port being configured to be electrically connected to an electric energy receiving device via a wiring harness; a communication circuit configured to establish a communication connection with the power receiving device; a controller, electrically connected to the DC-AC conversion circuit and the communication circuit respectively; The DC-AC conversion circuit is configured to: in response to the communication between the power supply device and the power receiving device and the preset charging condition being met, the DC-AC conversion circuit receives an instruction from the controller and operates in a pass-through mode to establish a DC transmission path between the power supply device and the power receiving device; wherein, The through mode is defined as: the power of the power supply device is output in a DC manner on the AC side of the DC-AC conversion circuit; The preset charging condition includes: at least one of the power providing device and the power receiving device includes a DC-DC conversion circuit.

2. The electric energy supply device according to claim 1, characterized in that: Also includes: DC-DC conversion circuit; The input end of the DC-DC conversion circuit is electrically connected to the electric energy storage unit, and the output end of the DC-DC conversion circuit is electrically connected to the DC side of the DC-AC conversion circuit.

3. The electric energy supply device according to claim 1 or 2, characterized in that: The electric energy storage unit includes a battery module or a photovoltaic module.

4. The electric energy supply device according to claim 3, characterized in that: When the electric energy storage unit includes a battery module, the electric energy providing device further includes: an input port, electrically connected to the DC-AC conversion circuit, the input port being configured to be electrically connected to a charging device via a wiring harness; The controller is further configured to: obtain identification information of the charging device through the communication circuit; In response to the identification information of the charging device being consistent with the identification information of the electric energy providing device, it is determined that the electric energy providing device is in a self-charging state.

5. The electric energy supply device according to claim 1, characterized in that: The controller is further configured to: feed back the maximum discharge power of the power providing device to the power receiving device via the communication circuit, so that the power receiving device adjusts its target charging power to not exceed the maximum discharge power; The DC-AC conversion circuit is configured to: receive an instruction from the controller and operate in the direct-flow mode or the inverter mode to provide electric energy to the electric energy receiving device at the target charging power; The inversion mode is defined as follows: the electric energy of the electric energy providing device is output in an AC manner on the AC side of the DC-AC conversion circuit.

6. The electric energy supply device according to any one of claims 1 to 5, characterized in that: The communication circuit includes a power line communication component; The power line communication component is configured to transmit a carrier signal through the wire harness to establish a communication connection with the power receiving device.

7. The electric energy supply device according to claim 6, characterized in that: The power line communication component comprises: a data processing unit, electrically connected to the controller, the data processing unit being configured to: encapsulate information from the controller into corresponding transmission data; a modulation unit electrically connected to the data processing unit, wherein the modulation unit is configured to: modulate the transmission data into a carrier signal having a target frequency and transmit the carrier signal through the wiring harness; a demodulation unit, electrically connected to the data processing unit, and configured to: perform demodulation processing on the acquired carrier signal, extract received data, and transmit the received data to the data processing unit; The data processing unit is further configured to parse the received data and provide a parsing result to the controller.

8. The electric energy supply device according to any one of claims 1 to 5, characterized in that: The communication circuit is a wireless communication component.

9. The electric energy supply device according to any one of claims 1 to 8, characterized in that: The DC-AC conversion circuit includes: An inverter switch unit, comprising a plurality of switches adopting a preset topology structure; a first capacitor, wherein a first end of the first capacitor is electrically connected to the first connection end of the inverter switch unit, a second end of the first capacitor is electrically connected to the second connection end of the inverter switch unit, and the first end and the second end of the first capacitor are the DC side of the DC-AC conversion circuit; a second capacitor and an inductor, wherein a first end of the inductor is electrically connected to the third connection terminal of the inverter switch unit, a second end of the inductor is electrically connected to the first end of the second capacitor, a second end of the second capacitor is electrically connected to the fourth connection terminal of the inverter switch unit, and the first end and the second end of the second capacitor are AC sides of the DC-AC conversion circuit; The DC-AC conversion circuit further includes: a switch controller, electrically connected to the controller and the switch, respectively, and configured to drive the switch to be turned on or off; or The drive circuit is electrically connected to the controller and the switch, and is used to convert the switch control signal from the controller into a switch drive signal to drive the switch to be turned on or off.

10. The electric energy supply device according to claim 9, characterized in that: The inverter switch unit includes: a first switch, a second switch, a third switch and a fourth switch; The first end of the first switch is connected to the first end of the second switch, the second end of the first switch is connected to the first end of the third switch, the second end of the second switch is connected to the first end of the fourth switch, and the second end of the fourth switch is connected to the second end of the third switch. A common connection node between the first end of the first switch and the first end of the second switch forms a first connection end of the inverter switch unit, and a common connection node between the second end of the third switch and the second end of the fourth switch forms a second connection end of the inverter switch unit; A common connection node between the second end of the first switch and the first end of the third switch forms a third connection end of the switch unit; A common connection node between the second end of the second switch and the first end of the fourth switch forms a fourth connection end of the switch unit; When the DC-AC conversion circuit is in the pass-through mode, the second switch and the third switch remain turned on, and the first switch and the fourth switch remain turned off, or The second switch and the third switch remain off, and the first switch and the fourth switch remain on.

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