A constant current and constant voltage wireless charging device, method and system

Abstract

The present invention discloses a constant current and constant voltage wireless charging device, comprising a DC power supply, a high frequency inverter, a primary LCCL type energy transmitting module, a secondary LCCL type energy receiving module, a rectifier filter module, a battery module and a communication module; the DC power supply, the high frequency inverter and the primary LCCL type energy transmitting module are connected in sequence; the output end of the primary LCCL type energy transmitting module is coupled and connected with the input end of the secondary LCCL type energy receiving module; the secondary LCCL type energy receiving module, the rectifier filter module and the battery module are connected in sequence; the input end of the communication module is connected with the secondary LCCL type energy receiving module, and the output end of the communication module is connected with the relay in the primary LCCL type energy transmitting module. The embodiment of the present invention realizes a wireless charging device with a small size and low cost, which can be widely used in the field of wireless charging technology.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to a constant current and constant voltage wireless charging device, method and system thereof. Background Art

[0002] Wireless power transmission technology achieves electrical isolation between the power transmitter and the receiver, eliminating the risks of fire, electric shock, exposed conductors, etc. It is safer and more convenient than the traditional plug-in charging method connected by wires. When charging the battery using wireless power transmission technology, in order to ensure the safety and stability of the battery charging process and extend the battery life, a constant current and constant voltage charging method is generally adopted, that is, the entire charging process goes through two stages: constant current charging and constant voltage charging. However, the existing LCCL-LCCL topology structure characteristics only enable it to output current that is independent of the load to achieve constant current charging; if constant voltage charging is to be achieved, it generally includes the following methods:

[0003] 1. Through continuous closed-loop control and regulation strategy, the DC bus voltage is changed to achieve constant voltage. However, this method has high requirements for communication and requires continuous communication of feedback signals. Once the communication is interrupted, constant voltage charging will fail.

[0004] 2. By utilizing the frequency characteristics of the charging device, find the operating frequency point where the voltage gain is independent of the load to achieve constant output current and voltage. However, this method is only applicable under fixed coupling conditions. When the coupling coefficient changes, the corresponding constant voltage frequency point will also change accordingly. To achieve constant voltage output within a wide coupling range, it is necessary to perform multiple parameter identifications on the device and calculate the constant voltage frequency point, which requires high device parameter identification and control accuracy.

[0005] 3. Use multiple switches to switch between constant voltage topology and constant current topology. This method often requires the connection of additional compensation components through multiple switches, and generally keeps the compensation structure of the primary side unchanged, and changes the compensation structure of the secondary side to achieve constant voltage and constant current conversion, but this will increase the size and manufacturing cost of the charging device. Summary of the invention

[0006] In view of this, an object of an embodiment of the present invention is to provide a constant current and constant voltage wireless charging device, method and system thereof, which improve the stability of the charging device, reduce the workload required in the constant voltage mode, and realize a wireless charging device with small size and low cost.

[0007] In a first aspect, an embodiment of the present invention provides a constant current and constant voltage wireless charging device, including a DC power supply, a high frequency inverter, a primary LCCL type energy transmitting module, a secondary LCCL type energy receiving module, a rectifier and filter module, a battery module and a communication module; wherein,

[0008] The input end of the high frequency inverter is connected to a DC power source;

[0009] The output end of the high frequency inverter is connected to the input end of the primary side LCCL type energy transmitting module;

[0010] The output end of the primary LCCL type energy transmitting module is coupled to the input end of the secondary LCCL type energy receiving module; the primary LCCL type energy transmitting module includes a first series circuit consisting of a first capacitor and a relay connected in series;

[0011] The output end of the secondary side LCCL type energy receiving module is connected to the input end of the rectifier and filter module;

[0012] The output end of the rectifier and filter module is connected to the battery module;

[0013] The input end of the communication module is connected to the secondary side LCCL type energy receiving module, and the output end of the communication module is connected to the relay in the primary side LCCL type energy transmitting module.

[0014] Optionally, the primary LCCL type energy emission module includes a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor and a relay; the first inductor, the second capacitor and the second inductor are connected in series, the first capacitor and the relay are connected in series to form a first series circuit, the second capacitor and the second inductor are connected in series to form a second series circuit, the first series circuit is connected in parallel with the second series circuit; the third capacitor is connected in parallel with the second series circuit.

[0015] Optionally, the first inductor or the second inductor includes an equivalent inductor element formed by combining an inductor and a capacitor; the first capacitor, the second capacitor or the third capacitor includes an equivalent capacitor element formed by combining an inductor and a capacitor.

[0016] Optionally, the secondary side LCCL type energy receiving module includes a third inductor, a fourth inductor, a fourth capacitor and a fifth capacitor; the third inductor, the fourth capacitor and the fourth inductor are connected in series, the third inductor and the fourth capacitor are connected in series to form a third series circuit, and the fifth capacitor is connected in parallel with the third series circuit; the secondary side LCCL type energy receiving module is coupled and connected to the primary side LCCL type energy transmitting module through the mutual inductance between the third inductor and the second inductor.

[0017] Optionally, the third inductor or the fourth inductor includes an equivalent inductor element formed by combining an inductor and a capacitor; the fourth capacitor or the fifth capacitor includes an equivalent capacitor element formed by combining an inductor and a capacitor.

[0018] Optionally, the secondary side LCCL type energy receiving module satisfies:

[0019]

[0020] in, is the fourth inductor, is the fifth capacitor, L2 is the third inductor, C2 is the fourth capacitor, and ω is the frequency.

[0021] Optionally, when the relay is disconnected, the primary LCCL type energy transmitter module satisfies:

[0022]

[0023] in, is the first inductor, C cc is the third capacitor, Z1 is the equivalent impedance of the branch where the first inductor is located, and Z2 is the third capacitor C cc The impedance of the branch, ω is the frequency, and j represents a complex number.

[0024] Optionally, when the relay is closed, the primary LCCL type energy transmitter module satisfies:

[0025]

[0026] Among them, C CV is the first capacitor, L1 is the second inductor, C1 is the second inductor, Z3 is the sum of the impedances of the second capacitor C1 and the second inductor L1 in series, Z1 is the equivalent impedance of the branch where the first inductor is located, and Z2 is the third capacitor C cc The impedance of the branch, ω is the frequency, and j represents a complex number.

[0027] In a second aspect, an embodiment of the present invention provides a constant current and constant voltage wireless charging method, using the constant current and constant voltage wireless charging device as described above, comprising:

[0028] Control the constant current and constant voltage wireless charging device to start working and charge the battery module; the charging mode includes constant current mode and constant voltage mode;

[0029] Obtain charging parameters of the secondary side LCCL type energy receiving module, and determine whether the charging parameters reach preset parameter values;

[0030] When the charging parameter is less than the preset parameter value, the first control signal is transmitted to the relay in the primary LCCL type energy transmission module through the communication module, and the relay is controlled to remain in an off state, so that the constant current and constant voltage wireless charging device is charged in the constant current mode;

[0031] When the charging parameter is greater than the preset parameter value, the second control signal is transmitted to the relay in the primary LCCL energy transmission module through the communication module, and the relay is controlled to remain in a closed state, so that the constant current and constant voltage wireless charging device is charged in the constant voltage mode.

[0032] In a third aspect, a constant current and constant voltage wireless charging system comprises the constant current and constant voltage wireless charging device as described above and a computer device connected to the constant current and constant voltage wireless charging device, wherein:

[0033] A constant current and constant voltage wireless charging device for charging the battery;

[0034] Computer equipment includes:

[0035] at least one processor;

[0036] at least one memory for storing at least one program;

[0037] When at least one program is executed by at least one processor, the at least one processor implements the method described above.

[0038] The implementation of the embodiments of the present invention includes the following beneficial effects: the embodiments of the present invention adopt an LCCL-LCCL topology structure, and the device includes a primary LCCL type energy transmitting module and a secondary LCCL type energy receiving module. The primary LCCL type energy transmitting module includes a first series circuit composed of a first capacitor and a relay in series. The charging mode is switched by controlling the switching state of the relay, thereby realizing a single switch to control constant voltage output or constant current output, so that the charging device does not need to rely on continuous signal feedback to achieve constant voltage regulation, thereby improving the charging stability; the charging device can operate in the constant voltage mode only by closing the switch, without the need to calculate the constant voltage frequency point multiple times, thereby reducing the workload required in the constant voltage mode; and a single switch controls the constant voltage output or constant current output, thereby realizing a low-cost and small-volume wireless constant voltage and constant current charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a constant current and constant voltage wireless charging device provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of an equivalent circuit of a constant current and constant voltage wireless charging device provided by an embodiment of the present invention;

[0041] Figure 3 Schematic diagram of an equivalent circuit of a primary-side LCCL energy transmission module provided by an embodiment of the present invention;

[0042] Figure 4 is a structural schematic diagram of another constant current and constant voltage wireless charging device provided by an embodiment of the present invention;

[0043] Figure 5 A constant current and constant voltage wireless charging method is provided in an embodiment of the present invention;

[0044] Figure 6 This is a constant current output waveform diagram provided by an embodiment of the present invention;

[0045] Figure 7 This is a constant voltage output waveform diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only provided for the convenience of explanation and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0047] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0048] In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0049] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present invention have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the embodiments of the present invention are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0050] like Figure 1 As shown, an embodiment of the present invention provides a constant current and constant voltage wireless charging device, including a DC power supply 1, a high frequency inverter 2, a primary LCCL type energy transmitting module 3, a secondary LCCL type energy receiving module 4, a rectifier and filter module 5, a battery module 6 and a communication module 7; wherein,

[0051] The input end of the high frequency inverter 2 is connected to the DC power supply 1;

[0052] The output end of the high frequency inverter 2 is connected to the input end of the primary LCCL type energy transmitting module 3;

[0053] The output end of the primary LCCL type energy transmitting module 3 is coupled to the input end of the secondary LCCL type energy receiving module 4; the primary LCCL type energy transmitting module 3 includes a first series circuit consisting of a first capacitor and a relay connected in series;

[0054] The output end of the secondary side LCCL type energy receiving module 4 is connected to the input end of the rectifying and filtering module 5;

[0055] The output end of the rectifying and filtering module 5 is connected to the battery module 6;

[0056] The input end of the communication module 7 is connected to the secondary LCCL type energy receiving module 4 , and the output end of the communication module is connected to the relay in the primary LCCL type energy transmitting module 3 .

[0057] Specifically, the primary LCCL type energy transmitting module 3 is coupled to the secondary LCCL type energy receiving module 4 to form an LCCL-LCCL topology structure, which has excellent high filtering characteristics and high design freedom.

[0058] Specifically, the high-frequency inverter 2 is used to convert the low-voltage direct current output by the direct current power supply into high-frequency alternating current, which is input into the primary-side LCCL energy transmission module 3 .

[0059] Specifically, the rectifying and filtering module 5 is used to rectify and filter the high-frequency alternating current output by the secondary LCCL type energy receiving module 4 , convert it into a direct current signal, and filter out noise in the signal, and input it into the battery module 6 .

[0060] Specifically, the communication module 7 includes a first communicator connected to the secondary LCCL type energy receiving module 4, and a second communicator connected to the primary LCCL type energy transmitting module 3; the connection method between the first communicator and the second communicator includes wired connection or wireless connection.

[0061] Specifically, the DC power supply 1 outputs low-voltage DC power to the high-frequency inverter 2, and outputs high-frequency AC power from the high-frequency inverter 2 to the primary LCCL energy transmitting module 3. The secondary LCCL energy receiving module 4 and the primary LCCL energy transmitting module 3 generate high-frequency AC power through mutual inductance, which is input into the rectification and filtering module 5, rectified and filtered to convert it into a DC signal and output it to the battery module 6. During the charging process, the first communicator of the communication module 7 sends the received control signal to the second communicator, thereby controlling the relay to open or close.

[0062] Specifically, when the relay is disconnected, the constant current and constant voltage wireless charging device operates in a constant current mode; when the relay is closed, the constant current and constant voltage wireless charging device operates in a constant voltage mode.

[0063] Optionally, the primary LCCL type energy transmission module 3 includes a first inductor The second inductor L1 and the first capacitor C CV , the second capacitor C1, the third capacitor C cc and relay K0; first inductor The second capacitor C1 is connected in series with the second inductor L1. CVThe first series circuit is connected in series with the relay K0, the second capacitor C1 and the second inductor L1 are connected in series to form a second series circuit, and the first series circuit is connected in parallel with the second series circuit; the third capacitor C cc In parallel with the second series circuit.

[0064] Optionally, the first inductor or the second inductor includes an equivalent inductor element formed by combining an inductor and a capacitor; the first capacitor, the second capacitor or the third capacitor includes an equivalent capacitor element formed by combining an inductor and a capacitor.

[0065] Optionally, the secondary side LCCL type energy receiving module 4 includes a third inductor L2, a fourth inductor The fourth capacitor C2 and the fifth capacitor The third inductor L2, the fourth capacitor C2 and the fourth inductor The third inductor L2 and the fourth capacitor C2 are connected in series to form a third series circuit, and the fifth capacitor In parallel with the third series circuit; the secondary side LCCL type energy receiving module 4 is coupled and connected with the primary side LCCL type energy transmitting module 3 through the mutual inductance between the third inductor and the second inductor.

[0066] Optionally, the third inductor or the fourth inductor includes an equivalent inductor element formed by combining an inductor and a capacitor; the fourth capacitor or the fifth capacitor includes an equivalent capacitor element formed by combining an inductor and a capacitor.

[0067] Optionally, the secondary side LCCL type energy receiving module satisfies:

[0068]

[0069] in, is the fourth inductor, is the fifth capacitor, L2 is the third inductor, C2 is the fourth capacitor, and ω is the frequency.

[0070] Specifically, ω is the frequency in the circuit.

[0071] Optionally, when the relay is disconnected, the primary LCCL type energy transmitter module satisfies:

[0072]

[0073] in, is the first inductor, C cc is the third capacitor, Z1 is the first inductor The equivalent impedance of the branch where it is located, Z2 is the third capacitor C cc The impedance of the branch, ω is the frequency, and j represents a complex number.

[0074] Specifically, when the relay is in different states, the value of Z2 is different.

[0075] Optionally, when the relay is closed, the primary LCCL type energy transmitter module satisfies:

[0076]

[0077] Among them, C cv is the first capacitor, L1 is the second inductor, C1 is the second inductor, Z3 is the sum of the impedances of the second capacitor C1 and the second inductor L1 in series, Z1 is the equivalent impedance of the branch where the first inductor is located, and Z2 is the third capacitor C cc The impedance of the branch, ω is the frequency, and j represents a complex number.

[0078] like Figure 2 As shown, the embodiment of the present invention provides an equivalent circuit of a constant current and constant voltage wireless charging device, and the parallel circuit of a DC power supply and a high frequency inverter is equivalent to an AC power supply u AB , the load of the rectifier filter module and the battery module is equivalent to the equivalent load Z on the rectifier side eq .

[0079] Specifically, the equivalent impedance Z of the secondary LCCL type energy receiving module is 21 for:

[0080]

[0081] in, The fourth inductor and the rectifier side equivalent load Z eq The sum of the impedances.

[0082] like Figure 3 As shown, an embodiment of the present invention provides an equivalent circuit of a primary LCCL type energy transmitting module, and the equivalent circuit is implemented by merging a secondary LCCL type energy receiving module into a primary LCCL type energy transmitting module.

[0083] Specifically, when the relay is disconnected, the constant current constant voltage wireless charging device operates in the constant current mode. At this time, the primary transmitting coil current i1, that is, the current passing through the second inductor in the primary LCCL type energy transmitting module is:

[0084]

[0085] At this time, the current passing through the equivalent load on the rectifier side is:

[0086]

[0087] Wherein, M is the mutual inductance between the second inductor L1 and the third inductor L2. eqIt can be concluded from the formula that, in the constant current mode, the device of the embodiment of the present invention realizes a constant current output that is independent of the load, and the current i1 passing through the second inductor in the primary LCCL energy transmission module is also a constant current output.

[0088] Specifically, when the relay is closed, the constant current constant voltage wireless charging device operates in the constant voltage mode. At this time, the reflection impedance Z4 reflected from the secondary LCCL type energy receiving module to the primary LCCL type energy transmitting module is:

[0089]

[0090] Among them, Y is the equivalent load Z on the rectifier side eq The irrelevant coefficients,

[0091] Specifically, the total impedance of the constant current constant voltage wireless charging device is:

[0092]

[0093] At this time, the primary transmitting coil current i′1, that is, the current passing through the second inductor in the primary LCCL type energy transmitting module is:

[0094]

[0095] Among them, Z1, Z2, Z3 and Z4 satisfy:

[0096] Z1Z2+Z1Z3+Z2Z3=0

[0097] Then we have:

[0098]

[0099] Load voltage u ab for:

[0100]

[0101] like Figure 4 As shown, the embodiment of the present invention provides another constant current constant voltage wireless charging device. Figure 1 The constant current constant voltage wireless charging device shown is based on the fourth inductor The fifth inductor and the sixth capacitor The equivalent inductor formed in series, the rectifier filter module 5 includes a first diode Q1, a second diode Q2, a third diode Q3, a fourth diode Q4 and a seventh capacitor C, the first diode Q2 and the third diode Q3 are connected in series to form a fourth series circuit, the second diode Q2 and the fourth diode Q4 are connected in series to form a fifth series circuit, the fourth series circuit is connected in parallel with the fifth series circuit and the seventh capacitor C; the load of the battery module is RL .

[0102] Specifically, the specific structure of the rectification and filtering module 5 includes but is not limited to the following: Figure 5 The specific structure of the provided structure is determined according to actual conditions and is not limited in the embodiments of the present invention. The embodiments are only provided for reference.

[0103] Under the resonant condition, the primary LCCL energy transmitting module 3 satisfies:

[0104]

[0105] The secondary side LCCL type energy receiving module 4 meets the following requirements:

[0106]

[0107] Specifically, when the relay K0 is closed, the constant current and constant voltage wireless charging device operates in the constant voltage mode, with:

[0108]

[0109] Among them, for Z2,

[0110]

[0111] Then the load voltage u ab for:

[0112]

[0113] Specifically, based on Figure 4 The constant current and constant voltage wireless charging device shown is verified by the matlab / simulink simulation platform, and the parameters are shown in the following table:

[0114] Table 1 Parameter values

[0115]

[0116] like Figure 5 As shown, an embodiment of the present invention provides a constant current and constant voltage wireless charging method, using the constant current and constant voltage wireless charging device as described above, including:

[0117] S100, controlling the constant current and constant voltage wireless charging device to start working and charge the battery module; the charging mode includes a constant current mode and a constant voltage mode;

[0118] Specifically, when the constant current and constant voltage wireless charging device starts to work, the relay of the constant current and constant voltage wireless charging device is in a disconnected state, and the constant current and constant voltage wireless charging device works in a constant current mode.

[0119] Specifically, the constant current and constant voltage wireless charging device starts working, and low voltage direct current is input from the direct current power supply to the high frequency inverter, and is converted by the high frequency inverter into high frequency alternating current and input into the primary LCCL type energy transmitting module. The secondary LCCL type energy receiving module and the primary LCCL type energy transmitting module are mutually inductive to generate high frequency alternating current, which is input into the rectifying and filtering module for rectification and filtering, and then converted into direct current and input into the battery module.

[0120] S200, obtaining charging parameters of the secondary side LCCL type energy receiving module, and determining whether the charging parameters reach preset parameter values;

[0121] Specifically, the charging parameters include the voltage, current or charging time in the circuit; the preset parameter values ​​include the preset charging voltage or the preset charging time. The specific preset parameter values ​​and the specific numerical values ​​of the preset parameters are determined according to actual conditions, and are not limited in the embodiments of the present invention. The embodiments are only provided for reference.

[0122] Specifically, the charging parameters of the secondary side LCCL type energy receiving module are obtained through a battery management system (BMS), and the battery management system includes at least an information acquisition module, a control module, and a communication module, etc., wherein:

[0123] An information acquisition module, used to collect charging parameters of the secondary side LCCL type energy receiving module;

[0124] A control module, used to determine whether the charging parameter reaches a preset parameter value and transmit a control signal to the communication module;

[0125] The communication module is used to send the control signal to the communication module of the constant current and constant voltage wireless charging device.

[0126] Specifically, obtaining the charging parameters of the secondary side LCCL type energy receiving module and determining whether the charging parameters reach the preset parameter values ​​specifically include:

[0127] At intervals of a first preset time period, the battery management system is controlled to obtain the charging parameters of the secondary LCCL type energy receiving module, and the control module is used to determine whether the charging parameters have reached the preset parameter values.

[0128] Alternatively, the information acquisition module collects the charging parameters of the secondary LCCL type energy receiving module at intervals of a second preset time period or continuously, and whenever the information acquisition module collects the charging parameters, the control module immediately determines whether the charging parameters reach the preset parameter values.

[0129] S300, when the charging parameter is less than the preset parameter value, the first control signal is transmitted to the relay in the primary LCCL type energy transmission module through the communication module, and the relay is controlled to remain in an off state, so that the constant current and constant voltage wireless charging device is charged in the constant current mode;

[0130] Specifically, the communication module receives the first control signal sent by the battery management system and controls the relay to remain in an off state, so that the constant current and constant voltage wireless charging device is charged in a constant current mode. During the charging process, the charging voltage gradually increases and the charging current remains unchanged.

[0131] Specifically, the charging speed in the constant current mode will gradually increase with time, which is conducive to shortening the charging time.

[0132] S400: When the charging parameter is greater than the preset parameter value, the second control signal is transmitted to the relay in the primary LCCL energy transmission module through the communication module, and the relay is controlled to remain in a closed state, so that the constant current and constant voltage wireless charging device is charged in the constant voltage mode.

[0133] Specifically, the communication module receives the second control signal sent by the battery management system, controls the relay to switch from the open state to the closed state and maintain it, so that the constant current and constant voltage wireless charging device is charged in the constant voltage mode, and the charging voltage remains unchanged during the charging process, and the charging current gradually decreases.

[0134] Specifically, the constant voltage mode can reduce the burden on the battery during the charging process, which is beneficial to extending the service life of the battery.

[0135] The embodiment of the present invention further provides a constant current and constant voltage wireless charging system, comprising the constant current and constant voltage wireless charging device as described above and a computer device connected to the constant current and constant voltage wireless charging device; wherein:

[0136] A constant current and constant voltage wireless charging device for charging the battery;

[0137] Computer equipment includes:

[0138] at least one processor;

[0139] at least one memory for storing at least one program;

[0140] When at least one program is executed by at least one processor, the at least one processor implements the method described above.

[0141] Specifically, the computer device may be different types of electronic devices, including but not limited to terminals such as desktop computers and laptops.

[0142] like Figure 6 As shown, the constant current output waveform of the constant current constant voltage wireless charging device working in the constant current mode is tested. The load is switched at t=0.1s, and the charging current can be quickly restored after switching. It can be seen from the figure that the constant current constant voltage wireless charging device of the embodiment of the present invention realizes a constant current output that is independent of the load.

[0143] like Figure 7 As shown, the constant voltage output waveform of the constant current and constant voltage wireless charging device working in the constant voltage mode is tested. The load is switched at t=0.1s, and the charging voltage recovers quickly after a brief fluctuation. It can be seen from the figure that the constant current and constant voltage wireless charging device of the embodiment of the present invention realizes a constant voltage output that is independent of the load.

[0144] The implementation of the embodiments of the present invention includes the following beneficial effects: the embodiments of the present invention adopt an LCCL-LCCL topology structure, including a primary LCCL type energy transmitting module and a secondary LCCL type energy receiving module, the primary LCCL type energy transmitting module includes a first series circuit composed of a first capacitor and a relay in series, and the charging mode is switched by controlling the switching state of the relay, so that a single switch controls constant voltage output or constant current output, so that the charging device does not need to rely on continuous signal feedback to achieve constant voltage regulation, thereby improving the charging stability; the charging device can operate in the constant voltage mode only by closing the switch, without the need to calculate the constant voltage frequency point multiple times, thereby reducing the workload required in the constant voltage mode; and a single switch controls the constant voltage output or constant current output, thereby realizing a low-cost and small-volume wireless constant voltage and constant current charging device.

[0145] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A constant current and constant voltage wireless charging device, characterized in that: It includes a DC power supply, a high-frequency inverter, a primary LCCL type energy transmitting module, a secondary LCCL type energy receiving module, a rectifier filter module, a battery module and a communication module; wherein, The input end of the high frequency inverter is connected to the DC power supply; The output end of the high frequency inverter is connected to the input end of the primary LCCL type energy transmitting module; The output end of the primary LCCL type energy transmitting module is coupled and connected to the input end of the secondary LCCL type energy receiving module; the primary LCCL type energy transmitting module comprises a first series circuit consisting of a first capacitor and a relay connected in series; The output end of the secondary side LCCL type energy receiving module is connected to the input end of the rectification and filtering module; The output end of the rectification and filtering module is connected to the battery module; The input end of the communication module is connected to the secondary LCCL type energy receiving module, and the output end of the communication module is connected to the relay in the primary LCCL type energy transmitting module; The primary LCCL energy transmitting module includes a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor and a relay; the first inductor, the second capacitor and the second inductor are connected in series, the first capacitor and the relay are connected in series to form a first series circuit, the second capacitor and the second inductor are connected in series to form a second series circuit, the first series circuit is connected in parallel with the second series circuit; the third capacitor is connected in parallel with the second series circuit; When the relay is disconnected, the constant current and constant voltage wireless charging device operates in a constant current mode; when the relay is closed, the constant current and constant voltage wireless charging device operates in a constant voltage mode.

2. The constant current and constant voltage wireless charging device according to claim 1, characterized in that: The first inductor or the second inductor includes an equivalent inductor element formed by combining an inductor and a capacitor; the first capacitor, the second capacitor or the third capacitor includes an equivalent capacitor element formed by combining an inductor and a capacitor.

3. The constant current and constant voltage wireless charging device according to claim 1, characterized in that: The secondary side LCCL type energy receiving module includes a third inductor, a fourth inductor, a fourth capacitor and a fifth capacitor; the third inductor, the fourth capacitor and the fourth inductor are connected in series, the third inductor and the fourth capacitor are connected in series to form a third series circuit, and the fifth capacitor is connected in parallel with the third series circuit; the secondary side LCCL type energy receiving module is coupled and connected to the primary side LCCL type energy transmitting module through the mutual inductance between the third inductor and the second inductor.

4. The constant current and constant voltage wireless charging device according to claim 3, characterized in that: The third inductor or the fourth inductor includes an equivalent inductor element formed by combining an inductor and a capacitor; the fourth capacitor or the fifth capacitor includes an equivalent capacitor element formed by combining an inductor and a capacitor.

5. The constant current and constant voltage wireless charging device according to claim 1, characterized in that: The secondary side LCCL type energy receiving module meets the following requirements: in, is the fourth inductor, is the fifth capacitor, is the third inductor, The fourth capacitor, is the frequency.

6. The constant current and constant voltage wireless charging device according to claim 1, characterized in that: When the relay is disconnected, the primary LCCL type energy transmitting module satisfies: in, is the first inductor, is the third capacitor, is the equivalent impedance of the branch where the first inductor is located, The third capacitor The impedance of the branch, is the frequency.

7. The constant current and constant voltage wireless charging device according to claim 1, characterized in that: When the relay is closed, the primary LCCL energy transmitter module satisfies: in, is the first inductor, is the third capacitor, is the first capacitor, is the second inductor, The second inductor, The second capacitor in series and the second inductor The sum of the impedances in series, is the equivalent impedance of the branch where the first inductor is located, The third capacitor The impedance of the branch, is the frequency.

8. A constant current and constant voltage wireless charging method, characterized in that: The constant current and constant voltage wireless charging device according to any one of claims 1 to 7 comprises: Controlling the constant current and constant voltage wireless charging device to start working and charge the battery module; the charging mode includes a constant current mode and a constant voltage mode; Obtaining charging parameters of the secondary-side LCCL type energy receiving module, and determining whether the charging parameters reach preset parameter values; When the charging parameter is less than a preset parameter value, a first control signal is transmitted to a relay in the primary LCCL energy transmitting module through the communication module to control the relay to remain in an off state, so that the constant current and constant voltage wireless charging device is charged in a constant current mode; When the charging parameter is greater than a preset parameter value, the second control signal is transmitted to the relay in the primary LCCL energy transmission module through the communication module, and the relay is controlled to remain in a closed state, so that the constant current and constant voltage wireless charging device is charged in a constant voltage mode.

9. A constant current and constant voltage wireless charging system, characterized in that: A constant current and constant voltage wireless charging device comprising the constant current and constant voltage wireless charging device as described in any one of claims 1 to 7 and a computer device connected to the constant current and constant voltage wireless charging device; wherein: The constant current and constant voltage wireless charging device is used to charge the battery; The computer device comprises: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the constant current and constant voltage wireless charging method as described in claim 8.

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