Wide-range high-power wireless power transmission system and control method

Abstract

The invention relates to a wide-range high-power wireless power transmission system and a control method, and belongs to the technical field of power electronic conversion, the system comprises a plurality of modules connected in parallel, the input ends of the modules connected in parallel are electrically connected with a direct current power supply, and the output ends of the modules connected in parallel are electrically connected with a load; the module comprises a rectifier and an inverter of an H-type circuit structure formed by a switching tube. The input end of the inverter is electrically connected with the direct-current power supply, and the output end is electrically connected with one end of the resonance compensation network; the input end of the rectifier is electrically connected with the other end of the resonance compensation network, and the output end is electrically connected with a load through a rectification capacitor; and the PWM driving device is electrically connected with the grid electrode of the switching tube and is used for controlling the working mode of the inverter and the number of the inverter access systems so as to output power and voltage meeting different requirements. The technical problem that in the prior art, output voltage and output power are difficult to meet actual requirements is effectively solved.

Description

Technical Field

[0001] The invention belongs to the field of power electronic conversion and relates to a wide-range high-power wireless power transmission system and a control method. Background Art

[0002] In recent years, unmanned underwater vehicles have developed rapidly in information collection and ocean measurement. Most tasks require continuous long-term cruising in specific sea areas. The endurance of unmanned equipment has become a shortcoming in its mission execution. Wireless power transmission technology uses a non-contact method to convert electrical energy into electromagnetic waves and other relay media for transmission through space seawater media, achieving electrical isolation. It can fundamentally solve the problem of safe, reliable, flexible, convenient and concealed power transmission and interconnection in the special harsh environment of the ocean. It is an important means to solve the energy problem of marine unmanned equipment and its clusters. Various isomorphic and heterogeneous unmanned underwater vehicles have different power and load characteristics, and the output voltage range of the power battery is wide.

[0003] The existing high-power wireless power transmission system has the problem of low single-module power level and is difficult to adapt to the wide output voltage requirements required by the constant current-constant voltage charging strategy of unmanned equipment power batteries. At the same time, since unmanned equipment clusters often include various large, medium and small equipment platforms, the output power level is tens to hundreds of kilowatts. It is difficult to achieve a wide range of power output through control methods alone. Summary of the invention

[0004] In view of this, it is necessary to provide a wide-range high-power wireless power transmission system and control method to solve the problem that the output voltage and output power of the prior art are difficult to meet actual needs.

[0005] In order to solve the above problems, the present invention provides a wide range high power wireless power transmission system, comprising: A plurality of modules connected in parallel, wherein the input ends of the modules connected in parallel are electrically connected to a DC power supply, and the output ends of the modules connected in parallel are electrically connected to a load; The module includes: a rectifier and an inverter with an H-type circuit structure formed by a switch tube; The input end of the inverter is electrically connected to a DC power supply, and the output end is electrically connected to one end of a resonant compensation network; The input end of the rectifier is electrically connected to the other end of the resonant compensation network, and the output end is electrically connected to the load through the rectifier capacitor; The PWM drive device is electrically connected to the gate of the switch tube and is used to control the working mode of the inverter and the number of inverters connected to the system to output power and voltage that meet different requirements.

[0006] In a possible implementation, the inverter includes: A first switch tube, a second switch tube, a third switch tube and a fourth switch tube; The drain of the first switch tube is electrically connected to the drain of the third switch tube; The source of the second switch tube is electrically connected to the source of the fourth switch tube; The source of the first switch tube is electrically connected to the drain of the second switch tube, and one end of the connection is led out as the first output end of the inverter; The source of the third switch tube is electrically connected to the drain of the fourth switch tube, and one end of the connection is led out as the second output end of the inverter; One end of the DC power supply is electrically connected to the drain of the first switch tube and the source of the second switch tube, and the other end is electrically connected to the drain of the third switch tube and the source of the fourth switch tube.

[0007] In a possible implementation, the resonant compensation network includes: a primary side resonant compensation network and a secondary side resonant compensation network; The secondary side resonant compensation network has the same parameters as the primary side resonant compensation network and has a symmetrical structure; The primary resonance compensation network includes: a first compensation inductor, a first compensation capacitor, a second compensation inductor, a second compensation capacitor, a third compensation capacitor and a coupling mechanism; One end of the first compensation inductor is electrically connected to the first output end of the inverter, and the other end is electrically connected to the third compensation capacitor and the first compensation capacitor respectively, and the first compensation capacitor is connected in parallel with the first compensation inductor; One end of the second compensation inductor is electrically connected to the second output end of the inverter, and the other end is electrically connected to one end of the second compensation capacitor; The other end of the second compensation capacitor is electrically connected to one end of the primary coil of the coupling mechanism; The third compensation capacitor is connected in parallel with the primary coil of the coupling mechanism.

[0008] In a possible implementation, the parameters of the resonant compensation network meet the following requirements: When the frequency of the input signal of the DC power supply is the fundamental frequency or 3 times the frequency or 5 times the frequency, the input impedance of the primary compensation network and the input impedance of the secondary compensation network are pure resistances; When the frequency of the input signal of the DC power supply is twice the frequency, the first compensation inductor resonates with the first compensation capacitor to lock the flow of energy in the LC resonant circuit.

[0009] In a possible implementation, the rectifier includes: a first diode, a second diode, a third diode and a fourth diode; The load is respectively connected in parallel with a first series branch consisting of the rectifier capacitor, the first diode and the third diode, and a second series branch consisting of the second diode and the fourth diode.

[0010] In a possible implementation, the phase difference of the driving signals between adjacent different modules is ,in, m Indicates the total number of modules included in the system.

[0011] The present invention also provides a wide-range high-power wireless power transmission control method, which is applied to the wide-range high-power wireless power transmission system described in any one of the above system items, comprising: Determining whether the fluctuation amplitude of the output power belongs to a large-range output power fluctuation or a small-range output power fluctuation based on a preset threshold; When a wide range of output power fluctuations occurs, a first control signal is sent to the PWM drive device to switch in and switch out a plurality of wide range high power wireless power transmission systems in the wide range high power wireless power transmission system to control the output power of the entire load; When a small range of output power fluctuation occurs, a second control signal is sent to the PWM drive device to switch the working mode of the system, thereby controlling the output voltage of the system.

[0012] In a possible implementation, the step of accessing and removing several wide-range high-power wireless power transmission systems from the wide-range high-power wireless power transmission system includes: The number of modules to be connected and removed is calculated based on the output power of the load and the rated output power of the wide-range high-power wireless power transmission system.

[0013] In a possible implementation, the calculating the number of connected and removed modules based on the output power of the load and the rated output power of the wide-range high-power wireless power transmission system includes: When the output power of the load satisfies the first formula:

[0014] In the formula, n is an integer not less than 0, P 0 indicates the rated output power of the module. P L Indicates the output power of the load; Then access n modules and remove ( mn ) modules, among which, m Indicates the total number of modules in the system; When the load output power satisfies the second formula: , In the formula, n is an integer not less than 0, P0 indicates the rated output power of the module. P L Indicates the output power of the load; Access ( n +1) modules, and remove ( mn -1) modules.

[0015] In a possible implementation, the switching of the working mode of the system includes: Based on a preset gain threshold, determining whether the current power gain of the load is high gain, high middle gain, medium gain, low gain, or extreme gain; When the gain is high, the output power of the system is controlled based on the full-bridge variable frequency control method; When the gain is high or medium, the output power of the system is controlled based on the PFM or phase-shifted PSM method; When the gain is medium, the path structure in the system is switched to a half-bridge PFM topology; When the gain is low, the path structure in the system is switched to a half-bridge PWM topology; For very low gain, the path structure in the system is switched to a half-bridge BURST topology.

[0016] The beneficial effects of the present invention are as follows: the present invention provides a wide-range high-power wireless power transmission system, including a plurality of parallel modules, and each module includes an inverter, a rectifier resonant compensation network, a rectifier capacitor and a PWM drive device. Since the rated power output by each module is relatively stable under the same conditions, the present invention changes the number of modules connected to the system through a PWM drive device, which can effectively change the total output power of the system, achieve a wide range of power output, and meet the load's requirements for different powers. In addition, the present invention also changes the parameters of the input signal or the internal topology of the inverter through a PWM drive device, thereby changing the system's operating mode, expanding the system's output voltage range, and effectively solving the technical problem that the output voltage and output power of the prior art are difficult to meet actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an embodiment of a wide-range high-power wireless power transmission system provided by the present invention; Figure 2 A method flow chart of an embodiment of a wide-range high-power wireless energy transmission control method provided by the present invention; Figure 3 A logic curve diagram of the switching system working mode provided by the present invention; Figure 4 This is a key control waveform diagram of the single-module wide voltage output provided by the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] In the description of the embodiments of the present invention, unless otherwise specified, "multiple" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" may mean: A exists alone, A and B exist at the same time, and B exists alone.

[0020] The descriptions of "first", "second", etc. involved in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] In order to solve the above problems, Figure 1 As shown, the present invention provides a wide range high power wireless energy transmission system, comprising: Several modules connected in parallel are numbered 1, 2, ... m ,in m Indicates the number of modules specifically set in the system, the input end after parallel connection is electrically connected to the DC power supply, and the output end after parallel connection is electrically connected to the load; Among them, the module includes: inverter and rectifier; The input end of the inverter is electrically connected to a DC power supply, and the output end is electrically connected to one end of a resonant compensation network; The input end of the rectifier is electrically connected to the other end of the resonant compensation network, and the output end is electrically connected to the load through the rectifier capacitor; The PWM drive device is electrically connected to the inverter and is used to control the working mode of the inverter and the number of inverters connected to the system to output power and voltage that meet different requirements.

[0023] Compared with the prior art, the present invention provides a wide-range high-power wireless power transmission system, which includes several parallel modules, and each module includes an inverter, a rectifier resonant compensation network, a rectifier capacitor and a PWM drive device. Since the rated power output of each module is relatively stable under the same conditions, the present invention changes the number of modules connected in the system through a PWM drive device, which can effectively change the total output power of the system, achieve a wide range of power output, and meet the load's requirements for different power. In addition, the present invention also changes the parameters of the input signal or the internal topology of the inverter through a PWM drive device, thereby changing the system's working mode, expanding the system's output voltage range, and effectively solving the technical problem that the output voltage and output power of the prior art are difficult to meet actual needs.

[0024] In a possible implementation, the inverter includes: The first switch D 11 , the second switch tube D 12 , the third switch tube D 13 And the fourth switch D 14 ; The first switch D 11 The drain of the third switch tube D 13 The drain is electrically connected to the The second switch D 12 The source of the fourth switch tube D 14 A source is electrically connected to the The first switch D 11 The source of the second switch tube D 12 The drain of the inverter is electrically connected, and one end of the wiring is led out as the first output end of the inverter; The third switch D 13 The source of the fourth switch tube D 14 The drain of the inverter is electrically connected, and one end of the wiring is led out as the second output end of the inverter; One end of the DC power supply is connected to the first switch tube D 11 The drain of the second switch D 12 The other end is electrically connected to the source of the third switch tube D 13 The drain of the fourth switch D14 The source is electrically connected to the

[0025] In a possible implementation, the resonant compensation network includes: a primary side resonant compensation network and a secondary side resonant compensation network; Among them, the secondary side resonant compensation network has the same parameters as the primary side resonant compensation network and has a symmetrical structure; The primary side resonant compensation network includes: the first compensation inductor L f11 , the first compensation capacitor C f11 , the second compensation inductor L p11 , the second compensation capacitor C p11 , the third compensation capacitor C 11 and a coupling mechanism; Among them, the first compensation inductor L f11 One end is electrically connected to the first output end of the inverter, and the other end is electrically connected to the third compensation capacitor C 11 And the first compensation capacitor C f11 electrically connected, and the first compensation capacitor C f11 With the first compensation inductor L f11 in parallel; Second compensation inductor L p11 One end is electrically connected to the second output end of the inverter, and the other end is electrically connected to the second compensation capacitor C p11 One end of the device is electrically connected; Second compensation capacitor C p11 The other end is electrically connected to one end of the primary coil of the coupling mechanism; The third compensation capacitor C 11 Connected in parallel with the primary coil of the coupling mechanism.

[0026] In one possible implementation, the parameters of the resonant compensation network meet the following requirements: When the frequency of the input signal of the DC power supply is the fundamental frequency or 3 times the frequency or 5 times the frequency, the input impedance of the primary compensation network and the input impedance of the secondary compensation network are pure resistances; When the frequency of the input signal of the DC power supply is twice the frequency, the first compensation inductor resonates with the first compensation capacitor to lock the flow of energy in the LC resonant circuit.

[0027] It can be understood that in this embodiment, the resonant compensation network is a high-order resonant compensation network group composed of an LC series group and an LC parallel group, which can simultaneously transmit the fundamental component, the third harmonic component or the fifth harmonic component, reducing the voltage stress of the power device and the stress of the resonant element. And through the resonant element parameter matching design, the frequency is 2 fs When the primary coil voltage is zero, the energy is locked in the primary circuit, thereby achieving fast soft start and fault isolation, and quickly troubleshooting the fault.

[0028] In a possible implementation, the rectifier includes: The first diode D 15 , the second diode D 16 , the third diode D 17 and the fourth diode D 18 ; Among them, the load R L Respectively with the rectifier capacitor C 0. The first diode D 15 and the third diode D 17 The first series branch is composed of a second diode D 16 and the fourth diode D 18 The second series branches formed are connected in parallel.

[0029] In a possible implementation, the phase difference of the driving signals between adjacent different modules is ,in, m Indicates the total number of modules included in the system.

[0030] It should be noted that, in this embodiment, each inverter group can reduce the output current ripple through staggered phase control.

[0031] like Figure 2 The present invention also provides a wide-range high-power wireless power transmission control method, which is applied to the wide-range high-power wireless power transmission system described in any one of the above-mentioned system items, comprising: Step S201: judging whether the fluctuation amplitude of the output power belongs to a large-range output power fluctuation or a small-range output power fluctuation based on a preset threshold; Step S202: When a wide range of output power fluctuations occurs, a first control signal is sent to the PWM driving device to access and cut off a number of wide range high power wireless power transmission systems in the wide range high power wireless power transmission system to control the output power of the entire load; Step S203: When a small-scale output power fluctuation occurs, a second control signal is sent to the PWM driving device to switch the working mode of the system, thereby controlling the output voltage of the system.

[0032] In a possible implementation, step S202 includes: The number of modules to be connected and removed is calculated based on the output power of the load and the rated output power of the wide-range high-power wireless power transmission system.

[0033] Furthermore, when the output power of the load satisfies the first formula: (1) In formula (1), n is an integer not less than 0, P 0 indicates the rated output power of the module. P L Indicates the output power of the load; Then access n modules and remove ( mn ) modules, among which, m Indicates the total number of modules in the system; When the load output power satisfies the second formula: (2) In formula (2), n is an integer not less than 0, P 0 indicates the rated output power of the module. P L Indicates the output power of the load; Access ( n +1) modules, and remove ( mn -1) modules.

[0034] In a possible implementation, step S203 includes: Based on a preset gain threshold, determining whether the power gain of the current load is high gain, high middle gain, medium gain, low gain, or extreme gain; When the gain is high, the output power of the system is controlled based on the full-bridge variable frequency control method; When the gain is high or medium, the output power of the system is controlled based on the PFM or phase-shifted PSM method; When the gain is medium, the path structure in the system is switched to a half-bridge PFM topology; When the gain is low, the path structure in the system is switched to a half-bridge PWM topology; For very low gain, the path structure in the system is switched to a half-bridge BURST topology.

[0035] Specifically, an additional closed-loop controller can be set in the system. The closed-loop controller outputs a dimensionless number G according to the load gain, and the PWM drive device switches to different working modes according to different G. The logic curve diagram of the variable mode control is as follows: Figure 3 As shown, the key control waveform is as follows Figure 4 shown.

[0036] The above is a detailed introduction to a wide-range high-power wireless power transmission system and control method provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be modifications in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A wide range high power wireless power transmission system, characterized in that: include: A plurality of modules connected in parallel, wherein the input ends of the modules connected in parallel are electrically connected to a DC power supply, and the output ends of the modules connected in parallel are electrically connected to a load; The module includes: a rectifier and an inverter with an H-type circuit structure formed by a switch tube; The input end of the inverter is electrically connected to a DC power supply, and the output end is electrically connected to one end of a resonant compensation network; The input end of the rectifier is electrically connected to the other end of the resonant compensation network, and the output end is electrically connected to the load through the rectifier capacitor; The PWM drive device is electrically connected to the gate of the switch tube and is used to control the working mode of the inverter and the number of inverters connected to the system to output power and voltage that meet different requirements.

2. The wide range high power wireless power transmission system according to claim 1, characterized in that: The inverter comprises: A first switch tube, a second switch tube, a third switch tube and a fourth switch tube; The drain of the first switch tube is electrically connected to the drain of the third switch tube; The source of the second switch tube is electrically connected to the source of the fourth switch tube; The source of the first switch tube is electrically connected to the drain of the second switch tube, and one end of the connection is led out as the first output end of the inverter; The source of the third switch tube is electrically connected to the drain of the fourth switch tube, and one end of the connection is led out as the second output end of the inverter; One end of the DC power supply is electrically connected to the drain of the first switch tube and the source of the second switch tube, and the other end is electrically connected to the drain of the third switch tube and the source of the fourth switch tube.

3. The wide range high power wireless power transmission system according to claim 2, characterized in that: The resonant compensation network includes: a primary side resonant compensation network and a secondary side resonant compensation network; The secondary side resonant compensation network has the same parameters as the primary side resonant compensation network and has a symmetrical structure; The primary resonance compensation network includes: a first compensation inductor, a first compensation capacitor, a second compensation inductor, a second compensation capacitor, a third compensation capacitor and a coupling mechanism; One end of the first compensation inductor is electrically connected to the first output end of the inverter, and the other end is electrically connected to the third compensation capacitor and the first compensation capacitor respectively, and the first compensation capacitor is connected in parallel with the first compensation inductor; One end of the second compensation inductor is electrically connected to the second output end of the inverter, and the other end is electrically connected to one end of the second compensation capacitor; The other end of the second compensation capacitor is electrically connected to one end of the primary coil of the coupling mechanism; The third compensation capacitor is connected in parallel with the primary coil of the coupling mechanism.

4. The wide range high power wireless power transmission system according to claim 3, characterized in that: The parameters of the resonant compensation network meet the following requirements: When the frequency of the input signal of the DC power supply is the fundamental frequency or 3 times the frequency or 5 times the frequency, the input impedance of the primary compensation network and the input impedance of the secondary compensation network are pure resistances; When the frequency of the input signal of the DC power supply is twice the frequency, the first compensation inductor resonates with the first compensation capacitor to allow energy to flow in the LC resonant circuit.

5. The wide range high power wireless power transmission system according to claim 1, characterized in that: The rectifier comprises: a first diode, a second diode, a third diode and a fourth diode; The load is respectively connected in parallel with a first series branch consisting of the rectifier capacitor, the first diode and the third diode, and a second series branch consisting of the second diode and the fourth diode.

6. The wide range high power wireless power transmission system according to claim 1, characterized in that: The phase difference of the driving signals between adjacent modules ,in, m Indicates the total number of modules included in the system.

7. A wide range high power wireless power transmission control method, applied to the wide range high power wireless power transmission system as claimed in any one of claims 1 to 6, characterized in that: include: Determining whether the fluctuation amplitude of the output power belongs to a large-range output power fluctuation or a small-range output power fluctuation based on a preset threshold; When a wide range of output power fluctuations occurs, a first control signal is sent to the PWM drive device to switch in and switch out a plurality of wide range high power wireless power transmission systems in the wide range high power wireless power transmission system to control the output power of the entire load; When a small range of output power fluctuation occurs, a second control signal is sent to the PWM drive device to switch the working mode of the system, thereby controlling the output voltage of the system.

8. The wide range high power wireless power transmission control method according to claim 7, characterized in that: The method of accessing and removing a plurality of wide-range high-power wireless power transmission systems from the wide-range high-power wireless power transmission system comprises: The number of modules to be connected and removed is calculated based on the output power of the load and the rated output power of the wide-range high-power wireless power transmission system.

9. The wide range high power wireless power transmission control method according to claim 8, characterized in that: The calculation of the number of connected and removed modules based on the output power of the load and the rated output power of the wide-range high-power wireless power transmission system includes: When the output power of the load satisfies the first formula: In the formula, n is an integer not less than 0, P 0 indicates the rated output power of the module. P L Indicates the output power of the load; Then access n modules and remove ( mn ) modules, among which, m Indicates the total number of modules in the system; When the load output power satisfies the second formula: ， In the formula, n is an integer not less than 0, P 0 indicates the rated output power of the module. P L Indicates the output power of the load; Access ( n +1) modules, and remove ( mn -1) modules.

10. The wide range high power wireless power transmission control method according to claim 7, characterized in that: The switching of the working mode of the system includes: Based on a preset gain threshold, determining whether the current power gain of the load is high gain, high middle gain, medium gain, low gain, or extreme gain; When the gain is high, the output power of the system is controlled based on the full-bridge variable frequency control method; When the gain is high or medium, the output power of the system is controlled based on the PFM or phase-shifted PSM method; When the gain is medium, the path structure in the system is switched to a half-bridge PFM topology; When the gain is low, the path structure in the system is switched to a half-bridge PWM topology; For very low gain, the path structure in the system is switched to a half-bridge BURST topology.

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