Wireless power transmission receiving side magnetic integrated rectification boost system and device

Abstract

The utility model discloses a wireless electric energy transmission receiving side magnetic integrated rectification boost system and device. The system comprises a power receiving coil circuit, a first energy storage device, a second energy storage device, a first switching circuit, a second switching circuit, a third switching circuit and a fourth switching circuit, the first switch circuit and the power receiving coil circuit form a first loop; the second switch circuit and the first energy storage device are connected in series and then form a second loop with the power receiving coil circuit; in the second loop, the second energy storage device is connected with the load in series and then is connected with the first energy storage device in parallel; the third switch circuit and the power receiving coil circuit form a third loop; the fourth switch circuit and the second energy storage device are connected in series and then form a fourth loop with the power receiving coil circuit; in the fourth loop, the first energy storage device and the load are connected in series and then are connected in parallel with the second energy storage device; and the first to fourth switching circuits are sequentially closed in different time periods in a power supply period of alternating current. According to the technical scheme, the hardware cost of the wireless charging system can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless charging, in particular to a magnetic integrated rectifier boost system and device on the receiving side of wireless power transmission. Background Art

[0002] With the advent of the new energy and electrical era, how to supply power to batteries or other load electrical appliances has become the current key research direction. Among them, as an efficient power transmission method, wireless charging technology has received more and more attention.

[0003] However, how to achieve more efficient and stable power output control has always been the core problem restricting the development of wireless charging technology. The current mainstream solution is to add an additional DC-DC converter (DC-DC) after the rectifier bridge on the secondary side of the wireless charging system. Based on the voltage conversion and boost function of the DC-DC, the output voltage is regulated by feedback control to stabilize the output voltage at the target value, so as to achieve constant current or constant voltage charging for the battery or other load electrical appliances.

[0004] However, the above method makes the hardware structure of the wireless charging system too complex, which will greatly increase the hardware cost of the wireless charging system and increase the difficulty of popularizing the wireless charging system. Summary of the Utility Model

[0005] In view of this, the utility model provides a magnetic integrated rectifier boost system and device on the receiving side of wireless power transmission, mainly aiming to solve the technical problem of too high hardware cost of the current wireless charging system.

[0006] To achieve the above purpose, the utility model first provides a magnetic integrated rectifier boost system on the receiving side of wireless power transmission. The magnetic integrated rectifier boost system on the receiving side of wireless power transmission includes a power receiving coil circuit, a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a first energy storage device and a second energy storage device. Among them, a power receiving coil is provided in the power receiving coil circuit to wirelessly receive alternating current.

[0007] The first switch circuit is connected between the first output end and the second output end of the power receiving coil circuit and forms a first loop with the power receiving coil circuit.

[0008] The second switch circuit and the first energy storage device are connected in series and then connected between the first output end and the second output end of the power receiving coil circuit and form a second loop with the power receiving coil circuit. In the second loop, the second energy storage device and the load are connected in series and then connected in parallel with the first energy storage device to supply power to the load through the second loop.

[0009] The third switch circuit is connected between the second output terminal and the first output terminal of the power receiving coil circuit, and forms a third loop with the power receiving coil circuit;

[0010] The fourth switch circuit and the second energy storage device are connected in series and then connected between the second output terminal and the first output terminal of the power receiving coil circuit, and form a fourth loop with the power receiving coil circuit; in the fourth loop, the first energy storage device and the load are connected in series and then connected in parallel with the second energy storage device to supply power to the load through the fourth loop;

[0011] The first switch circuit, the second switch circuit, the third switch circuit, and the fourth switch circuit are sequentially closed in segments within one power supply cycle of the alternating current.

[0012] In an embodiment of the present invention, the first switch circuit includes a first diode and a first field effect transistor; the drain terminal of the first field effect transistor is connected to the first output terminal of the power receiving coil circuit, the source terminal of the first field effect transistor is connected to the anode terminal of the first diode, and the cathode terminal of the first diode is connected to the second output terminal of the power receiving coil circuit; within the positive half cycle of the alternating current, the first field effect transistor is in a conducting state, and the conducting time of the first field effect transistor is less than the duration of the positive half cycle of the alternating current.

[0013] In an embodiment of the present invention, the second switch circuit includes a second diode and a second field effect transistor, and the fourth switch circuit includes a third field effect transistor; the anode terminal of the second diode is connected to the first output terminal of the power receiving coil circuit, and the cathode terminal of the second diode is respectively connected to the first end of the first energy storage device and the positive terminal of the load; the drain terminal of the second field effect transistor is respectively connected to the second end of the first energy storage device and the first end of the second energy storage device, the second end of the second energy storage device is connected to the negative terminal of the load, the source terminal of the second field effect transistor is connected to the source terminal of the third field effect transistor, and the drain terminal of the third field effect transistor is connected to the second output terminal of the power receiving coil circuit; within the positive half cycle of the alternating current, after the first field effect transistor is in an off state, the second field effect transistor is in a conducting state, and the sum of the conducting time of the first field effect transistor and the conducting time of the second field effect transistor is equal to the duration of the positive half cycle of the alternating current.

[0014] In an embodiment of the present utility model, the third switching circuit includes a third diode and a fourth field effect transistor; the drain terminal of the fourth field effect transistor is connected to the second output terminal of the power receiving coil circuit, the source terminal of the fourth field effect transistor is connected to the anode terminal of the third diode, and the cathode terminal of the third diode is connected to the first output terminal of the power receiving coil circuit; within the negative half cycle of the alternating current, the fourth field effect transistor is in a conducting state, and the conducting time of the fourth field effect transistor is less than the duration of the negative half cycle of the alternating current.

[0015] In an embodiment of the present utility model, the fourth switching circuit includes a fourth diode and a third field effect transistor, and the second switching circuit includes a second field effect transistor; the drain terminal of the third field effect transistor is connected to the second output terminal of the power receiving coil circuit, the source terminal of the third field effect transistor is connected to the source terminal of the second field effect transistor, and the drain terminal of the second field effect transistor is connected to the second end of the first energy storage device and the first end of the second energy storage device; the anode terminal of the fourth diode is connected to the second end of the second energy storage device and the negative terminal of the load, and the cathode terminal of the fourth diode is connected to the first output terminal of the power receiving coil circuit; within the negative half cycle of the alternating current, after the fourth field effect transistor is in an off state, the third field effect transistor is in a conducting state, and the sum of the conducting time of the fourth field effect transistor and the conducting time of the third field effect transistor is equal to the duration of the negative half cycle of the alternating current.

[0016] In an embodiment of the present utility model, the power receiving coil circuit further includes a first capacitor; the first end of the power receiving coil is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the first output terminal of the power receiving coil circuit, and the second end of the power receiving coil is connected to the second output terminal of the power receiving coil circuit.

[0017] In an embodiment of the present utility model, the power receiving coil includes a first coil wire and a second coil wire, and the first coil wire and the second coil wire are connected in series between the first end of the first capacitor and the second output terminal of the power receiving coil circuit; the first coil wire is wound into a wire ring in the same plane; the second coil wire extends along the extending direction of the first coil wire and is wound into a plurality of wire turns on the wire ring with the first coil wire as the central axis.

[0018] In addition, to achieve the above object, the present utility model further provides a wireless power transmission receiving side magnetic integrated rectifier boost device, and the wireless power transmission receiving side magnetic integrated rectifier boost device includes a power output device and the wireless power transmission receiving side magnetic integrated rectifier boost system as described above;

[0019] The electric energy output device includes a DC power supply, an inverter circuit, a resonant circuit, and a transmission coil;

[0020] The power output terminal of the DC power supply is connected to the inverter circuit to output direct current to the inverter circuit;

[0021] The inverter circuit is connected to the resonant circuit to convert the direct current into alternating current and send the alternating current to the resonant circuit;

[0022] The resonant circuit is used to transmit the alternating current to the transmission coil, so that the transmission coil performs electromagnetic signal interaction with the power receiving coil circuit in the wireless power transmission receiving side magnetic integrated rectifier boost system, and sends the alternating current to the power receiving coil circuit.

[0023] In an embodiment of the present invention, the inverter circuit includes a fifth field effect transistor, a sixth field effect transistor, a seventh field effect transistor, and an eighth field effect transistor; the drain terminal of the fifth field effect transistor is connected to the drain terminal of the sixth field effect transistor, and the connection terminal after connection is connected to the positive terminal of the DC power supply. The source terminal of the fifth field effect transistor is respectively connected to the positive terminal of the resonant circuit and the drain terminal of the seventh field effect transistor. The source terminal of the sixth field effect transistor is respectively connected to the negative terminal of the resonant circuit and the drain terminal of the eighth field effect transistor. The source terminals of the seventh field effect transistor and the eighth field effect transistor are connected, and the connection terminal after connection is connected to the negative terminal of the DC power supply.

[0024] In an embodiment of the present invention, the resonant circuit includes a first inductor, a second capacitor, and a third capacitor; the first end of the first inductor is connected to the source terminal of the fifth field effect transistor, the second end of the first inductor is respectively connected to the first end of the second capacitor and the first end of the third capacitor, the second end of the second capacitor is connected to the first end of the transmission coil, and the second end of the transmission coil is connected to the drain terminal of the eighth field effect transistor after being connected to the second end of the third capacitor.

[0025] For a wireless power transmission receiving side magnetic integrated rectifier boost system and device provided by the present invention, when the positive half cycle of the alternating current wirelessly received by the power receiving coil circuit starts, the first switch circuit is closed, and the second switch circuit, the third switch circuit, and the fourth switch circuit are respectively opened. At this time, the current wirelessly received by the power receiving coil circuit flows back from its first output terminal through the first switch circuit to the second output terminal of the power receiving coil circuit. The power receiving coil in the power receiving coil circuit can store energy as an inductor. At the same time, the load can be powered based on the electric energy stored in the first energy storage device and the second energy storage device.

[0026] Further, when the second switch circuit is closed and the first switch circuit, the third switch circuit, and the fourth switch circuit are respectively opened, the second switch circuit and the power receiving coil circuit form a second loop. At this time, the electric energy wirelessly received by the power receiving coil circuit, the electric energy stored in the second energy storage device, and the electric energy stored in the power receiving coil jointly supply power to the load. Based on the electric energy stored in the power receiving coil, the electric energy wirelessly received by the power receiving coil circuit is boosted to supply constant voltage and constant current to the load, and at the same time, the first energy storage device can be charged so that the first energy storage device can supply constant voltage and constant current to the load at the beginning of the positive half cycle and the negative half cycle of the alternating current.

[0027] Further, when the negative half cycle of the alternating current wirelessly received by the power receiving coil circuit starts, the third switch circuit is closed, and the first switch circuit, the second switch circuit, and the fourth switch circuit are respectively opened. At this time, the current wirelessly received by the power receiving coil circuit flows back from its second output terminal to the first output terminal of the power receiving coil circuit through the third switch circuit. The power receiving coil in the power receiving coil circuit can store energy as an inductor. At this time, the load is powered based on the electric energy stored in the first energy storage device and the second energy storage device.

[0028] Further, when the fourth switch circuit is closed and the first switch circuit, the second switch circuit, and the third switch circuit are respectively opened, the fourth switch circuit and the power receiving coil circuit form a fourth loop. At this time, the electric energy wirelessly received by the power receiving coil circuit, the electric energy stored in the first energy storage device, and the electric energy stored in the power receiving coil jointly supply power to the load. Similarly, based on the electric energy stored in the power receiving coil, the electric energy wirelessly received by the power receiving coil circuit is boosted to supply constant voltage and constant current to the load, and at the same time, the second energy storage device can be charged so that the second energy storage device can supply constant voltage and constant current to the load at the beginning of the positive half cycle and the negative half cycle of the alternating current. The technical solution provided by this application can perform chopping boost on the AC signal respectively in the positive half cycle and the negative half cycle of the alternating current. The first energy storage device and the second energy storage device alternately charge and discharge within the period of the alternating current, ensuring that the current flowing through the load is always in the same direction, and stabilizing the voltage value output by the system to the load, achieving high energy utilization rate and stable DC voltage output. Without the need to additionally set up a DC-DC for the system, the system can supply constant current, constant voltage, and constant power to the load, reducing the hardware cost of the wireless power transmission and reception side magnetic integration rectification boost system as a wireless charging system.

[0029] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the following specifically illustrates the specific embodiments of the present invention. Description of the Drawings

[0030] The accompanying drawings described herein are used to provide a further understanding of the present utility model and form a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0031] Figure 1 FIG. 1 shows one of the structural schematic diagrams of a magnetic integrated rectifier and boost system on the receiving side of wireless power transmission provided by an embodiment of the present utility model;

[0032] Figure 2 FIG. 2 shows another structural schematic diagram of a magnetic integrated rectifier and boost system on the receiving side of wireless power transmission provided by an embodiment of the present utility model;

[0033] Figure 3 FIG. 3 shows a top view of a power receiving coil provided by an embodiment of the present utility model;

[0034] Figure 4 FIG. 4 shows a side view of a power receiving coil provided by an embodiment of the present utility model;

[0035] Figure 5 FIG. 5 shows an isometric side view of a power receiving coil provided by an embodiment of the present utility model;

[0036] Figure 6 FIG. 6 shows a structural schematic diagram of a magnetic integrated rectifier and boost device on the receiving side of wireless power transmission provided by an embodiment of the present utility model. Detailed embodiments

[0037] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other.

[0038] To further elaborate on the technical means and effects adopted by the present utility model to achieve the intended utility model purpose, the following describes in detail the specific embodiments, structures, features, and their effects according to the present utility model application in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0039] The following will be combined with Figures 1 to 6 Describe a magnetic integrated rectifier and boost system and device on the receiving side of wireless power transmission according to some embodiments of the present utility model.

[0040] As Figure 1As shown in the figure, a magnetic integrated rectifier and boost system on the receiving side of wireless power transmission proposed by an embodiment of the present invention. The magnetic integrated rectifier and boost system on the receiving side of wireless power transmission includes a power receiving coil circuit 100, a first switch circuit 200, a second switch circuit 300, a third switch circuit 400, a fourth switch circuit 500, a first energy storage device Cs1, and a second energy storage device Cs2. Among them, the power receiving coil circuit 100 has a power receiving coil (not shown in the figure) to perform electromagnetic signal interaction through the power receiving coil and realize wireless reception of alternating current. Further, the first energy storage device Cs1 and the second energy storage device Cs2 can be a first voltage stabilizing capacitor and a second voltage stabilizing capacitor respectively. Further, the first switch circuit 200, the second switch circuit 300, the third switch circuit 400, and the fourth switch circuit 500 are sequentially closed in segments within a power supply cycle of the alternating current. Here, at the beginning of the positive half cycle of the alternating current, the first switch circuit 200 is first closed, and after closing for a preset time length, the first switch circuit 200 is disconnected and the second switch circuit 300 is closed. Among them, the sum of the closing time of the first switch circuit 200 and the closing time of the second switch circuit 300 is the duration of the positive half cycle of the alternating current. Further, at the beginning of the negative half cycle of the alternating current, the third switch circuit 400 is first closed, and after closing for a preset time length, the third switch circuit 400 is disconnected and the fourth switch circuit 500 is closed. Among them, the sum of the closing time of the third switch circuit 400 and the closing time of the fourth switch circuit 500 is the duration of the negative half cycle of the alternating current.

[0041] Further, the first switch circuit 200 is connected between the first output terminal P1 and the second output terminal P2 of the power receiving coil circuit 100 and forms a first loop with the power receiving coil circuit 100. Among them, the first switch circuit 200 can be controlled to be in a conducting or disconnected state. When the first switch circuit 200 is in a conducting state, the first loop is conducting. When the first switch circuit 200 is in a disconnected state, the first loop is disconnected. Here, the first switch circuit 200 can be controlled to be in a unidirectional conducting state. When the first switch circuit 200 is conducting, the current flows from the first output terminal P1 of the power receiving coil circuit 100 back to the second output terminal P2 through the first loop.

[0042] Further, the second switch circuit 300 and the first energy storage device Cs1 are connected in series and then connected between the first output terminal P1 and the second output terminal P2 of the power receiving coil circuit 100, and form a second loop with the power receiving coil circuit 100. Here, the first output terminal P1 of the power receiving coil circuit 100 is connected to the first end of the first energy storage device Cs1, the second end of the first energy storage device Cs1 is connected to the first end of the second switch circuit 300, and the second end of the second switch circuit 300 is connected to the second output terminal P2 of the power receiving coil circuit 100. Further, in the second loop, the second energy storage device Cs2 and the load L are connected in series and then connected in parallel with the first energy storage device Cs1 to supply power to the load L through the second loop. Here, the load L can be regarded as the equivalent load of the total loop, and the second switch circuit 300 can be controlled to be in a unidirectional conduction state. When the second switch circuit 300 is conducting, the current flows from the first output terminal P1 of the power receiving coil circuit 100 back to the second output terminal P2 through the second loop.

[0043] Specifically, at the beginning of the positive half-cycle of the alternating current wirelessly received by the power receiving coil circuit 100, the voltage at the first output terminal P1 of the power receiving coil circuit 100 is higher than the voltage at the second output terminal P2. The first switch circuit 200 conducts unidirectionally, and the second switch circuit 300, the third switch circuit 400, and the fourth switch circuit 500 are respectively disconnected. At this time, the current wirelessly received by the power receiving coil circuit 100 flows from its first output terminal P1 through the first switch circuit 200 back to the second output terminal P2 of the power receiving coil circuit 100. The power receiving coil in the power receiving coil circuit 100 can store energy as an inductor. At this time, the load L can be powered based on the electrical energy stored in the first energy storage device Cs1 and the second energy storage device Cs2.

[0044] Further, when the second switch circuit 300 conducts unidirectionally and the first switch circuit 200, the third switch circuit 400, and the fourth switch circuit 500 are respectively disconnected, the second switch circuit 300 and the power receiving coil circuit 100 form a second loop. At this time, the electrical energy wirelessly received by the power receiving coil circuit 100, the electrical energy stored in the second energy storage device Cs2, and the electrical energy stored in the power receiving coil jointly supply power to the load L. Based on the electrical energy stored in the power receiving coil, the electrical energy wirelessly received by the power receiving coil circuit 100 is boosted to supply constant voltage and constant current to the load L. At the same time, the first energy storage device Cs1 can also be charged to supply constant voltage and constant current to the load L through the first energy storage device Cs1 when the second switch circuit 300 is in the off state at the beginning of the positive half-cycle of the alternating current and when the fourth switch circuit 500 is in the off state at the beginning of the negative half-cycle of the alternating current.

[0045] Further, as Figure 1As shown, the third switch circuit 400 is connected between the second output terminal P2 and the first output terminal P1 of the power receiving coil circuit 100, and forms a third loop with the power receiving coil circuit 100. Among them, the third switch circuit 400 can be controlled to be in a conducting or non-conducting state. When the third switch circuit 400 is in the conducting state, the third loop is conducting. When the third switch circuit 400 is in the non-conducting state, the third loop is non-conducting. Here, the third switch circuit 400 can be controlled to be in a unidirectional conducting state. When the third switch circuit 400 is conducting, the current flows from the second output terminal P2 of the power receiving coil circuit 100 back to the first output terminal P1 through the third loop.

[0046] Furthermore, the fourth switch circuit 500 and the second energy storage device Cs2 are connected in series and then connected between the second output terminal P2 and the first output terminal P1 of the power receiving coil circuit 100, and form a fourth loop with the power receiving coil circuit 100. Here, the second output terminal P2 of the power receiving coil circuit 100 is connected to the second end of the second energy storage device Cs2, the first end of the second energy storage device Cs2 is connected to the first end of the fourth switch circuit 500, and the second end of the fourth switch circuit 500 is connected to the first output terminal P1 of the power receiving coil circuit 100. Furthermore, in the fourth loop, the first energy storage device Cs1 and the load L are connected in series and then connected in parallel with the second energy storage device Cs2 to supply power to the load L through the fourth loop. Here, the fourth switch circuit 500 can be controlled to be in a unidirectional conducting state. When the fourth switch circuit 500 is conducting, the current flows from the second output terminal P2 of the power receiving coil circuit 100 back to the first output terminal P1 through the fourth loop.

[0047] Specifically, at the beginning of the negative half cycle of the alternating current wirelessly received by the power receiving coil circuit 100, the voltage at the second output terminal P2 of the power receiving coil circuit 100 is higher than the voltage at the first output terminal P1. The third switch circuit 400 is closed, and the first switch circuit 200, the second switch circuit 300, and the fourth switch circuit 500 are respectively opened. At this time, the current wirelessly received by the power receiving coil circuit 100 flows from its second output terminal P2 back to the first output terminal P1 of the power receiving coil circuit 100 through the third switch circuit 300. The power receiving coil in the power receiving coil circuit 100 can store energy as an inductor. At this time, the load L is powered by the electrical energy stored in the first energy storage device Cs1 and the second energy storage device Cs2.

[0048] Further, when the fourth switch circuit 500 is closed and the first switch circuit 200, the second switch circuit 300, and the third switch circuit 400 are respectively opened, the fourth switch circuit 500 and the power receiving coil circuit 100 form a fourth loop. At this time, the electric energy wirelessly received by the power receiving coil circuit 100, the electric energy stored in the first energy storage device Cs1, and the electric energy stored in the power receiving coil jointly supply power to the load L. Similarly, based on the electric energy stored in the power receiving coil, the electric energy wirelessly received by the power receiving coil circuit 100 is boosted to supply constant voltage and constant current to the load L, and at the same time, the second energy storage device Cs2 can be charged. In the case where the second switch circuit 300 is in the open state at the beginning of the positive half cycle of the alternating current, and in the case where the fourth switch circuit 500 is in the open state at the beginning of the negative half cycle of the alternating current, the second energy storage device Cs2 supplies constant voltage and constant current to the load L.

[0049] The wireless power transmission receiving - side magnetic - integrated rectifier boost system proposed in the embodiment of the present utility model can respectively chop and boost the AC signal in the positive half cycle and the negative half cycle of the alternating current. The first energy storage device and the second energy storage device alternately charge and discharge within the cycle of the alternating current, ensuring that the current flowing through the load is always in the same direction, and stabilizing the voltage value output by the system to the load. By making full use of the cycle of the alternating current, high energy utilization rate and stable DC voltage output are achieved. Without the need to additionally set a DC - DC for the system, the system can supply constant current, constant voltage, and constant power to the load, reducing the hardware cost of the wireless charging system.

[0050] In one embodiment, as Figure 2 shown, the first switch circuit includes a first diode D1 and a first field - effect transistor S1; specifically, the drain terminal of the first field - effect transistor S1 is connected to the first output terminal P1 of the power receiving coil circuit 100, the source terminal of the first field - effect transistor S1 is connected to the anode terminal of the first diode D1, and the cathode terminal of the first diode D1 is connected to the second output terminal P2 of the power receiving coil circuit 100; wherein, within the positive half cycle of the alternating current, the first field - effect transistor S1 can be controlled to be in the conducting state, and the conducting time of the first field - effect transistor S1 is less than the duration of the positive half cycle of the alternating current.

[0051] The embodiment provided in the present application can achieve the unidirectional conduction of the first switch circuit based on the first diode and the first field - effect transistor, enabling the power receiving coil in the power receiving coil circuit to store energy as an inductor, so as to play a role in boosting in subsequent processes, and enabling the wireless power transmission receiving - side magnetic - integrated rectifier boost system to stably supply power to the load.

[0052] In one embodiment, as Figure 2As shown, the second switching circuit includes a second diode D2 and a second field effect transistor S2, and the fourth switching circuit includes a third field effect transistor S3; specifically, the anode terminal of the second diode D2 is connected to the first output terminal P1 of the power receiving coil circuit 100, and the cathode terminal of the second diode D2 is respectively connected to the first terminal of the first energy storage device Cs1 and the positive terminal of the load L; further, the drain terminal of the second field effect transistor S2 is respectively connected to the second terminal of the first energy storage device Cs1 and the first terminal of the second energy storage device Cs2, the second terminal of the second energy storage device Cs2 is connected to the negative terminal of the load L, the source terminal of the second field effect transistor S2 is connected to the source terminal of the third field effect transistor S3, and the drain terminal of the third field effect transistor S3 is connected to the second output terminal P2 of the power receiving coil circuit 100. Among them, in the positive half cycle of the alternating current, after the first field effect transistor S1 is in the off state, the second field effect transistor S2 is in the on state, and the sum of the conduction time of the first field effect transistor S1 and the conduction time of the second field effect transistor S2 is equal to the duration of the positive half cycle of the alternating current.

[0053] Here, by controlling the conduction and disconnection of the second field effect transistor S2, the one-way conduction of the second loop can be controlled. When the second field effect transistor S2 is conducting, the current output from the first output terminal P1 of the power receiving coil circuit 100 flows through the second diode D2 and the first energy storage device Cs1 to the drain terminal of the second field effect transistor S2, and the current output from the first output terminal P1 of the power receiving coil circuit 100 can also flow through the second diode D2, the load L and the second energy storage device Cs2 to the drain terminal of the second field effect transistor S2; further, the current flowing out from the source of the second field effect transistor S2 flows through the anti-parallel diode of the third field effect transistor S3 to the second output terminal P2 of the power receiving coil circuit 100.

[0054] In the embodiment provided by the present application, when the second loop conducts unidirectionally, the electric energy wirelessly received by the power receiving coil circuit and the electric energy stored in the power receiving coil jointly supply power to the load. Based on the electric energy stored in the power receiving coil, the electric energy wirelessly received by the power receiving coil circuit is boosted to supply constant voltage and constant current to the load. At the same time, the first energy storage device can also be charged, so that the first energy storage device can supply constant voltage and constant current to the load in the subsequent process, improving the power supply stability of the system.

[0055] In one embodiment, as Figure 2As shown, the third switching circuit includes a third diode D3 and a fourth field-effect transistor S4. Specifically, the drain terminal of the fourth field-effect transistor S4 is connected to the second output terminal P2 of the power receiving coil circuit 100, the source terminal of the fourth field-effect transistor S4 is connected to the anode terminal of the third diode D3, and the cathode terminal of the third diode D3 is connected to the first output terminal P1 of the power receiving coil circuit 100. Here, within the negative half-cycle of the alternating current, the fourth field-effect transistor S4 can be controlled to be in a conducting state, and the conduction time of the fourth field-effect transistor S4 is less than the duration of the negative half-cycle of the alternating current.

[0056] The embodiment provided in this application can achieve unidirectional conduction of the third switching circuit based on the third diode and the fourth field-effect transistor, enabling the power receiving coil in the power receiving coil circuit to store energy as an inductor, so as to achieve the function of boosting in the subsequent process, and enabling the wireless power transmission receiving-side magnetic integration rectifier boost system to stably supply power to the load.

[0057] In one embodiment, as Figure 2 shown, the fourth switching circuit includes a fourth diode D4 and a third field-effect transistor S3, and the second switching circuit includes a second field-effect transistor S2. Specifically, the drain terminal of the third field-effect transistor S3 is connected to the second output terminal P2 of the power receiving coil circuit 100, the source terminal of the third field-effect transistor S3 is connected to the source terminal of the second field-effect transistor S2, and the drain terminal of the second field-effect transistor S2 is connected to the second end of the first energy storage device Cs1 and the first end of the second energy storage device Cs2.

[0058] Furthermore, the anode terminal of the fourth diode D4 is connected to the second end of the second energy storage device Cs2 and the negative terminal of the load L, and the cathode terminal of the fourth diode D4 is connected to the first output terminal P1 of the power receiving coil circuit 100.

[0059] Further, within the negative half-cycle of the alternating current, after the fourth field-effect transistor S4 is turned off, the third field-effect transistor S3 is turned on. The sum of the conduction time of the fourth field-effect transistor S4 and the conduction time of the third field-effect transistor S3 is equal to the duration of the negative half-cycle of the alternating current. Here, the unidirectional conduction of the fourth loop can be controlled by controlling the conduction and disconnection of the third field-effect transistor S3. When the third field-effect transistor S3 is turned on, the current output from the second output terminal P2 of the power receiving coil circuit 100 flows through the third field-effect transistor S3, the parallel reverse diode of the second field-effect transistor S2, the second energy storage device Cs2, and the fourth diode D4 to the first output terminal P1 of the power receiving coil circuit 100. The current output from the second output terminal P2 of the power receiving coil circuit 100 can also flow through the third field-effect transistor S3, the parallel reverse diode of the second field-effect transistor S2, the first energy storage device Cs1, the load L, and the fourth diode D4 to the first output terminal P1 of the power receiving coil circuit 100.

[0060] In the embodiment provided by the present application, when the fourth loop conducts unidirectionally, the electric energy wirelessly received by the power receiving coil circuit and the electric energy stored in the power receiving coil jointly supply power to the load. Based on the electric energy stored in the power receiving coil, the electric energy wirelessly received by the power receiving coil circuit is boosted to supply constant voltage and constant current to the load. At the same time, the second energy storage device can be charged, enabling the second energy storage device to supply constant voltage and constant current to the load in subsequent processes, improving the power supply stability of the system.

[0061] Further, the gate terminals of the first field-effect transistor S1, the second field-effect transistor S2, the third field-effect transistor S3, and the fourth field-effect transistor S4 can be connected to a remote host computer (not shown in the figure) to receive the control of the host computer to be turned on or off. Further, the first loop and the second loop can form a boost circuit of one path of the system, and the third loop and the fourth loop can form another boost circuit of the system. The two boost circuits are combined together to enable the functions of rectification and boosting in one module.

[0062] In one embodiment, as Figure 2 shown, the power receiving coil circuit 100 includes a first capacitor C1 and a power receiving coil L1; specifically, the first end of the power receiving coil L1 is connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the first output terminal P1 of the power receiving coil circuit 100, and the second end of the power receiving coil L1 is connected to the second output terminal P2 of the power receiving coil circuit 100. In the embodiment provided by the present application, the first capacitor can be used as the secondary resonant capacitor of the system to achieve the resonant matching of the wireless power transmission receiving-side magnetic integration rectification and boost system, thereby improving the power supply quality of the wireless power transmission receiving-side magnetic integration rectification and boost system.

[0063] In one embodiment, as Figure 3 , Figure 4 and Figure 5 shown, the power receiving coil includes a first coil wire L11 and a second coil wire L12. The first coil wire L11 and the second coil wire L12 are connected in series between the first end of the first capacitor (not shown in the figure) and the second output end of the power receiving coil circuit. Specifically, the first end of the first coil wire L11 is connected to the first end of the second coil wire L12, and the second end of the first coil wire L11 and the second end of the second coil wire L12 are connected to the power receiving coil circuit. Among them, the second end of the first coil wire L11 can be connected to the first end of the first capacitor, and the second end of the second coil wire L12 is connected to the second output end of the power receiving coil circuit. In addition, the second end of the first coil wire L11 can also be connected to the second output end of the power receiving coil circuit, and the second end of the second coil wire L12 is connected to the first end of the first capacitor. The specific connection form can be determined according to the actual situation.

[0064] Specifically, the first coil wire L11 is wound into a wire ring in the same plane, and the second coil wire L12 extends along the direction in which the first coil wire L11 extends inside the wire ring, and takes the first coil wire L11 as the central axis, and is wound into a plurality of wire turns on the wire ring. Among them, the plane where the wire turns are located is perpendicular to the plane where the wire ring is located.

[0065] Here, the first coil wire L11 is a circular planar coil wound around a central axis, and it is closely attached to a magnetic core with a specific shape, so as to enhance the magnetic coupling effect with the primary coil of the wirelessly transmitted alternating current, and ensure efficient energy transfer. Further, one end of the second coil wire L12 is led out from the inner side of the wire ring formed by the first coil wire L11, and winds along a direction perpendicular to the wire ring until it winds around the entire wire ring and then is led out to increase the additional number of turns. The coil with the additional number of turns can be used as the freewheeling inductor of the power receiving coil circuit to help maintain the continuity of the current during the switching cycle, while the other end of the second coil wire L12 is directly led out from the outer side of the wire ring. The second end of the first coil wire L11 and the second end of the second coil wire L12 are respectively connected to different points on the secondary circuit to complete the construction of the entire circuit. This coil design ingeniously integrates multiple functions into one coil assembly, not only saving space but also simplifying the overall circuit structure.

[0066] In the embodiments provided by this application, the power receiving coil undertakes two functions simultaneously: First, the power receiving coil and the first capacitor together form a resonant network to optimize the energy reception efficiency; Second, the power receiving coil can serve as the freewheeling inductor in the boost circuit, capable of boosting the voltage across the load. In this way, efficient energy reception and smooth current are achieved, the current fluctuation can be reduced, and at the same time, together with the inductor, a low-pass filter structure is formed to filter out high-frequency noise and harmonic components, making the output voltage of the system more stable.

[0067] Here, the topology of the magnetic integrated rectifier-booster system on the receiving side of wireless power transfer is analyzed. The first capacitor C1 and the power receiving coil L1 form the resonant network on the secondary side, enabling the AC voltage to be transferred from the primary side to the secondary side. When the voltage at the first output terminal P1 is a positive voltage, the voltage at the second output terminal P2 is a negative voltage, and the first field-effect transistor S1 is turned on, it is equivalent to a short circuit in the first loop. The inductance of the power receiving coil L1 is large enough, causing the current to form a closed loop through the first field-effect transistor S1 and the first diode D1. At the same time, the first energy storage device Cs1 supplies power to the load L; When the first field-effect transistor S1 is turned off, the voltage flows through the second diode D2 to charge the first energy storage device Cs1 and also supplies power to the load L. At this time, the second field-effect transistor S2 is turned on, and the current forms a closed loop through the parallel reverse diode of the third field-effect transistor S3 and the second field-effect transistor S2.

[0068] Furthermore, when the voltage at the first output terminal P1 is a negative voltage, the voltage at the second output terminal P2 is a positive voltage, and the fourth field-effect transistor S4 is turned on, it is equivalent to a short circuit in the third loop. The current forms a closed loop through the fourth field-effect transistor S4 and the third diode D3. At the same time, the second energy storage device Cs2 supplies power to the load L; When the fourth field-effect transistor S4 is turned off, the third field-effect transistor S3 is turned on, and the voltage flows through the parallel reverse diode of the second field-effect transistor S2 and the third field-effect transistor S3 to charge the voltage-stabilized second energy storage device Cs2 and also supplies power to the load L. Subsequently, the current flows back to the power receiving coil circuit 100 to form a closed loop.

[0069] Compared with the traditional AC boost circuit that rectifies first and then boosts, the magnetic integrated rectifier-booster system on the receiving side of wireless power transfer in this application uses a composite boost cascade converter to combine two boost circuits together, enabling both rectification and boosting to be performed in one module. By adding the second field-effect transistor S2 and the third field-effect transistor S3 to the traditional boost circuit, the loops of the upper and lower boost circuits work independently during their respective working cycles without affecting each other.

[0070] Furthermore, in combination with Figure 2 The working process of the magnetic integrated rectifier-booster system on the receiving side of wireless power transfer is described as follows:

[0071] Phase 1: When the AC power received by the system enters the positive half-cycle, the first field-effect transistor S1 conducts, and the second field-effect transistor S2, the third field-effect transistor S3, and the fourth field-effect transistor S4 are turned off. At this time, the current flows through the first field-effect transistor S1 and the first diode D1 to form a closed loop and return to the power receiving coil circuit serving as the input source. The first energy storage device Cs1, the second energy storage device Cs2, and the load L form a closed loop, enabling the first energy storage device Cs1 and the second energy storage device Cs2 to supply power to the load L together. At the same time, the power receiving coil L1 stores energy as an inductor.

[0072] Phase 2: After the AC power enters the positive half-cycle and passes through a preset time length, the second field-effect transistor S2 conducts, and the first field-effect transistor S1, the third field-effect transistor S3, and the fourth field-effect transistor S4 are turned off. At this time, the voltage output by the power receiving coil circuit, the voltage stored in the second energy storage device Cs2, and the energy stored on the power receiving coil L1 are used to charge the first energy storage device Cs1 through the second diode D2 together, and supply power to the load L at the same time. Further, the current in the system forms a closed loop and returns to the input source through the parallel reverse diode of the conducting second field-effect transistor S2 and the non-conducting third field-effect transistor S3. The current return path includes two parallel paths: one is to directly return to the input source through the first energy storage device Cs1; the other is to return to the input source through the load L and the second energy storage device Cs2.

[0073] Phase 3: When the AC power enters the negative half-cycle, the fourth field-effect transistor S4 conducts, and the first field-effect transistor S1, the second field-effect transistor S2, and the third field-effect transistor S3 are turned off. At this time, the current flows through the fourth field-effect transistor S4 and the third diode D3 to form a closed loop and return to the input source. The first energy storage device Cs1, the second energy storage device Cs2, and the load L form a closed loop, enabling the first energy storage device Cs1 and the second energy storage device Cs2 to supply power to the load L together. At the same time, the power receiving coil L1 stores energy as an inductor.

[0074] Phase 4: After the AC power enters the negative half-cycle and passes through a preset time length, the third field-effect transistor S3 conducts, and the first field-effect transistor S1, the second field-effect transistor S2, and the fourth field-effect transistor S4 are turned off. At this time, the voltage output by the power receiving coil circuit, the voltage stored in the first energy storage device Cs1, and the energy stored on the power receiving coil L1 are used to charge the second energy storage device Cs2 through the third field-effect transistor S3 and the parallel reverse diode of the non-conducting second field-effect transistor S2 together, and supply power to the load L at the same time. Then, it forms a closed loop and returns to the input source through the fourth diode D4. The return path also includes two parallel paths: one is to directly return to the input source through the second energy storage device Cs2; the other is to return to the input source through the first energy storage device Cs1 and the load L.

[0075] In summary, within the above-mentioned first and second stages, the system operates in the positive half-cycle of the alternating current. The field-effect transistor in the upper circuit of the secondary side loop has switching actions. Through the on and off of the first field-effect transistor S1, the Boost circuit chops and boosts the positive half-cycle of the alternating current signal. Similarly, within the third and fourth stages, the system operates in the negative half-cycle of the alternating current. The field-effect transistor in the lower circuit of the secondary side loop has switching actions. Through the on and off of the fourth field-effect transistor S4, the Boost circuit chops and boosts the negative half-cycle of the alternating current signal. At the same time, by controlling the on and off of the second field-effect transistor S2 and the third field-effect transistor S3, it serves as a loop wire in the positive half-cycle to allow the current to flow back, and in the negative half-cycle, it undertakes the role of a unidirectional diode, enabling the upper and lower circuits to operate independently without mutual interference. During the entire working cycle, the first energy storage device Cs1 and the second energy storage device Cs2 alternately charge and discharge, ensuring that the current flowing through the load L is always in the same direction and enabling the voltage value received by the load L to remain stable.

[0076] The technical solution provided by this application is based on the topological structure of the LCC-S wireless charging system, makes full use of the alternating current cycle, reduces the conduction loss of the switching device, improves the energy utilization rate of the system, and can realize the function of stably outputting a DC voltage to the load. At the same time, the system generally uses a dual-voltage-stabilized capacitor power supply scheme. Through the automatic voltage equalization of the voltage-stabilized capacitor, the switching loss and output fluctuation are effectively reduced, and the robustness and reliability of the system are enhanced. While realizing high-power-density wireless charging, the system has high efficiency and stability.

[0077] It should be noted that the circuit function of the wireless power transmission receiving-side magnetic integration rectification and boost system provided in this embodiment is mainly realized through the circuit connection relationship between each circuit module, rather than depending on the program module in a certain circuit module.

[0078] On the other hand, an embodiment of the present invention provides a wireless power transmission receiving-side magnetic integration rectification and boost device. The wireless power transmission receiving-side magnetic integration rectification and boost device includes a power output device and the above-mentioned wireless power transmission receiving-side magnetic integration rectification and boost system. Among them, the power output device serves as the primary side of the wireless power transmission receiving-side magnetic integration rectification and boost device, and the wireless power transmission receiving-side magnetic integration rectification and boost system serves as the secondary side of the wireless power transmission receiving-side magnetic integration rectification and boost device. Specifically, as Figure 6 shown, the power output device includes a DC power supply Vin, an inverter circuit 600, a resonant circuit 700, and a transmission coil L2.

[0079] Specifically, the power output terminal of the DC power supply Vin is connected to the inverter circuit 600 to output direct current to the inverter circuit 600. The inverter circuit 600 is connected to the resonant circuit 700 to convert the direct current into alternating current and send the alternating current to the resonant circuit 700. Further, the resonant circuit 700 is used to deliver the alternating current to the power transmission coil L2, so that the power transmission coil L2 and the power receiving coil circuit 100 in the wireless power transmission receiving-side magnetic integration rectification boost system perform electromagnetic signal interaction, and send the alternating current to the power receiving coil circuit 100 based on the mutual inductance M between the coils.

[0080] Further, as Figure 6 shown, the inverter circuit 600 includes a fifth field-effect transistor S5, a sixth field-effect transistor S6, a seventh field-effect transistor S7, and an eighth field-effect transistor S8. Among them, the gate terminals of the fifth field-effect transistor S5, the sixth field-effect transistor S6, the seventh field-effect transistor S7, and the eighth field-effect transistor S8 can be connected to a host computer (not shown in the figure) to be turned on or off under the control of the host computer.

[0081] Specifically, the drain terminal of the fifth field-effect transistor S5 is connected to the drain terminal of the sixth field-effect transistor S6, and the connection terminal after connection is connected to the positive terminal of the DC power supply Vin. The source terminal of the fifth field-effect transistor S5 is respectively connected to the positive terminal of the resonant circuit 700 and the drain terminal of the seventh field-effect transistor S7. The source terminal of the sixth field-effect transistor S6 is respectively connected to the negative terminal of the resonant circuit 700 and the drain terminal of the eighth field-effect transistor S8. The source terminals of the seventh field-effect transistor S7 and the eighth field-effect transistor S8 are connected, and the connection terminal after connection is connected to the negative terminal of the DC power supply Vin.

[0082] Here, the fifth field-effect transistor S5 and the eighth field-effect transistor S8 can be turned on, and the sixth field-effect transistor S6 and the seventh field-effect transistor S7 can be turned off, so that the wireless power transmission receiving-side magnetic integration rectification boost system is in the positive half-cycle of the alternating current; correspondingly, the sixth field-effect transistor S6 and the seventh field-effect transistor S7 can be turned on, and the fifth field-effect transistor S5 and the eighth field-effect transistor S8 can be turned off, so that the wireless power transmission receiving-side magnetic integration rectification boost system is in the negative half-cycle of the alternating current. In the embodiment provided by the present application, by alternately controlling the on and off of the fifth field-effect transistor, the sixth field-effect transistor, the seventh field-effect transistor, and the eighth field-effect transistor, the power output device can output alternating current, improving the operability of the power output device.

[0083] In one embodiment, as Figure 6 shown, the resonant circuit 700 includes a first inductor L01, a second capacitor C2, and a third capacitor C3.

[0084] Specifically, the first end of the first inductor L01 is connected to the source end of the fifth field-effect transistor S5, the second end of the first inductor L01 is respectively connected to the first end of the second capacitor C2 and the first end of the third capacitor C3, the second end of the second capacitor C2 is connected to the first end of the power transmission coil L2, and the connection end after the second end of the power transmission coil L2 is connected to the second end of the third capacitor C3 is connected to the drain end of the eighth field-effect transistor S8. Among them, the third capacitor C3 can be used as the primary parallel resonance capacitor, and the second capacitor C2 can be used as the primary series compensation capacitor. In the embodiment provided by the present application, an alternating current is output to the power receiving coil circuit through the resonance circuit to achieve resonance matching of the alternating current, and the impedance of the signal source and the impedance of the load are adjusted to an equal state to achieve maximum power transmission, thereby improving the power transmission quality of the wireless power transmission receiving-side magnetic integration rectifier boost device.

[0085] In the wireless power transmission receiving-side magnetic integration rectifier boost device provided by the present application, the fifth field-effect transistor, the sixth field-effect transistor, the seventh field-effect transistor, and the eighth field-effect transistor are cascaded gallium nitride metal-oxide-semiconductor field-effect transistors (MOSFETs), which are used to invert direct current into alternating current with a fixed frequency; the first inductor, the first capacitor, the second capacitor, and the third capacitor are all resonance elements to provide a resonance environment; further, the power transmission coil and the power receiving coil are transmission coil inductors for realizing power transmission; the first field-effect transistor, the second field-effect transistor, the third field-effect transistor, and the fourth field-effect transistor are cascaded gallium nitride MOSFET switching tubes for high-frequency operation; the first diode, the second diode, the third diode, and the fourth diode are respectively unidirectional diodes to prevent current backflow, and the first energy storage device and the second energy storage device are respectively the voltage stabilizing capacitors of the first Boost circuit and the second Boost circuit.

[0086] During the actual use process, a direct current can be first given to the power output device of the wireless power transmission receiving-side magnetic integration rectifier boost device, and the direct current is inverted into alternating current through the inverter circuit. Among them, the inverter circuit adopts a full-bridge inverter circuit composed of four switching tubes. Further, the resonance frequency for realizing the wireless power transmission of the wireless power transmission receiving-side magnetic integration rectifier boost device can be set , and the inductance value of the power transmission coil, the inductance value of the first inductor, the capacitance value of the second capacitor, and the capacitance value of the third capacitor in the circuit of the power output device are calculated through formula (1).

[0087] (1)

[0088] Wherein, is the preset resonance frequency, is the capacitance value of the second capacitor, is the capacitance value of the third capacitor, is the inductance value of the first inductor.

[0089] Furthermore, the wireless power transfer receiving-side magnetic integration rectifier-booster device transmits the inverted alternating current to the wireless power transfer receiving-side magnetic integration rectifier-booster system. The power-receiving coil of the wireless power transfer receiving-side magnetic integration rectifier-booster system and the first capacitor form a resonant circuit. By increasing the value of the inductance of the power-receiving coil, the resonant cavity of the inductance can form a resonant network with the capacitor. At the same time, the power-receiving coil also has sufficient margin to act as the freewheeling inductor in the Boost circuit, that is, the power-receiving coil not only acts as a power source in the secondary circuit but also acts as the freewheeling inductor.

[0090] The above-described embodiments merely represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A wireless power transmission receiving side magnetic integrated rectification and boosting system, characterized in that: The wireless power transmission receiving side magnetic integrated rectification boost system comprises a power receiving coil circuit, a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a first energy storage device and a second energy storage device, wherein the power receiving coil circuit has a power receiving coil to wirelessly receive alternating current; The first switch circuit is connected between the first output terminal and the second output terminal of the power receiving coil circuit, and forms a first loop with the power receiving coil circuit; The second switch circuit and the first energy storage device are connected in series and then connected between the first output terminal and the second output terminal of the power receiving coil circuit, and form a second loop with the power receiving coil circuit; in the second loop, the second energy storage device and the load are connected in series and then connected in parallel with the first energy storage device, so as to supply power to the load through the second loop; The third switch circuit is connected between the second output terminal and the first output terminal of the power receiving coil circuit, and forms a third loop with the power receiving coil circuit; The fourth switch circuit and the second energy storage device are connected in series and then connected between the second output terminal and the first output terminal of the power receiving coil circuit, and form a fourth loop with the power receiving coil circuit; in the fourth loop, the first energy storage device and the load are connected in series and then connected in parallel with the second energy storage device, so as to supply power to the load through the fourth loop; The first switch circuit, the second switch circuit, the third switch circuit and the fourth switch circuit are closed in sequence in time periods within a power supply cycle of the alternating current.

2. The wireless power transmission receiving side magnetic integrated rectification and boosting system according to claim 1, characterized in that: The first switch circuit includes a first diode and a first field effect transistor; The drain terminal of the first field effect transistor is connected to the first output terminal of the power receiving coil circuit, the source terminal of the first field effect transistor is connected to the anode terminal of the first diode, and the cathode terminal of the first diode is connected to the second output terminal of the power receiving coil circuit; In the positive half cycle of the alternating current, the first field effect transistor is in a conducting state, and the conduction time of the first field effect transistor is shorter than the duration of the positive half cycle of the alternating current.

3. The wireless power transmission receiving side magnetic integrated rectification and boosting system according to claim 2 is characterized in that: The second switch circuit includes a second diode and a second field effect transistor, and the fourth switch circuit includes a third field effect transistor; The anode terminal of the second diode is connected to the first output terminal of the power receiving coil circuit, and the cathode terminal of the second diode is respectively connected to the first terminal of the first energy storage device and the positive terminal of the load; The drain terminal of the second field effect transistor is respectively connected to the second terminal of the first energy storage device and the first terminal of the second energy storage device, the second terminal of the second energy storage device is connected to the negative terminal of the load, the source terminal of the second field effect transistor is connected to the source terminal of the third field effect transistor, and the drain terminal of the third field effect transistor is connected to the second output terminal of the power receiving coil circuit; In the positive half cycle of the alternating current, after the first field effect tube is in the off state, the second field effect tube is in the on state, and the sum of the on time of the first field effect tube and the on time of the second field effect tube is equal to the duration of the positive half cycle of the alternating current.

4. The wireless power transmission receiving side magnetic integrated rectification and boosting system according to claim 1, characterized in that: The third switch circuit includes a third diode and a fourth field effect transistor; The drain terminal of the fourth field effect transistor is connected to the second output terminal of the power receiving coil circuit, the source terminal of the fourth field effect transistor is connected to the anode terminal of the third diode, and the cathode terminal of the third diode is connected to the first output terminal of the power receiving coil circuit; In the negative half cycle of the alternating current, the fourth field effect transistor is in a conducting state, and the conduction time of the fourth field effect transistor is shorter than the duration of the negative half cycle of the alternating current.

5. The wireless power transmission receiving side magnetic integrated rectification and boosting system according to claim 4, characterized in that: The fourth switch circuit includes a fourth diode and a third field effect transistor, and the second switch circuit includes a second field effect transistor; The drain terminal of the third field effect transistor is connected to the second output terminal of the power receiving coil circuit, the source terminal of the third field effect transistor is connected to the source terminal of the second field effect transistor, and the drain terminal of the second field effect transistor is connected to the second terminal of the first energy storage device and the first terminal of the second energy storage device; The anode terminal of the fourth diode is connected to the second terminal of the second energy storage device and the negative terminal of the load, and the cathode terminal of the fourth diode is connected to the first output terminal of the power receiving coil circuit; In the negative half cycle of the alternating current, after the fourth field effect tube is in the off state, the third field effect tube is in the on state, and the sum of the on time of the fourth field effect tube and the on time of the third field effect tube is equal to the duration of the negative half cycle of the alternating current.

6. The wireless power transmission receiving side magnetic integrated rectification and boosting system according to claim 1, characterized in that: The power receiving coil circuit also includes a first capacitor; The first end of the power receiving coil is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the first output end of the power receiving coil circuit, and the second end of the power receiving coil is connected to the second output end of the power receiving coil circuit.

7. The wireless power transmission receiving side magnetic integrated rectification and boosting system according to claim 6, characterized in that: The power receiving coil includes a first coil conductor and a second coil conductor, wherein the first coil conductor and the second coil conductor are connected in series between a first end of the first capacitor and a second output end of the power receiving coil circuit; The first coil wire is wound into a wire ring in the same plane; The second coil wire is arranged along the direction in which the first coil wire extends, with the first coil wire as the central axis, and is wound around the wire ring to form a plurality of wire rings.

8. A magnetic integrated rectifier boost device for wireless power transmission receiving side, characterized in that: The wireless power transmission receiving side magnetic integrated rectification and boosting device comprises an electric power output device and a wireless power transmission receiving side magnetic integrated rectification and boosting system as claimed in any one of claims 1 to 7; The electric energy output device includes a DC power supply, an inverter circuit, a resonant circuit and a power transmission coil; The power output terminal of the DC power supply is connected to the inverter circuit to output DC power to the inverter circuit; The inverter circuit is connected to the resonant circuit to convert the direct current into alternating current and send the alternating current to the resonant circuit; The resonant circuit is used to transmit the alternating current to the transmission coil, so that the transmission coil interacts with the receiving coil circuit in the magnetic integrated rectification and boosting system at the receiving side of the wireless power transmission through electromagnetic signals, and the alternating current is sent to the receiving coil circuit.

9. The wireless power transmission receiving side magnetic integrated rectifying and boosting device according to claim 8, characterized in that: The inverter circuit includes a fifth field effect transistor, a sixth field effect transistor, a seventh field effect transistor and an eighth field effect transistor; The connection end after the drain end of the fifth field effect transistor is connected to the drain end of the sixth field effect transistor is connected to the positive end of the DC power supply, the source end of the fifth field effect transistor is respectively connected to the positive end of the resonant circuit and the drain end of the seventh field effect transistor, the source end of the sixth field effect transistor is respectively connected to the negative end of the resonant circuit and the drain end of the eighth field effect transistor, and the connection end after the source end of the seventh field effect transistor is connected to the source end of the eighth field effect transistor is connected to the negative end of the DC power supply.

10. The wireless power transmission receiving side magnetic integrated rectifying and boosting device according to claim 9, characterized in that: The resonant circuit includes a first inductor, a second capacitor and a third capacitor; The first end of the first inductor is connected to the source terminal of the fifth field effect transistor, the second end of the first inductor is respectively connected to the first end of the second capacitor and the first end of the third capacitor, the second end of the second capacitor is connected to the first end of the power transmission coil, and the connection end after the second end of the power transmission coil is connected to the second end of the third capacitor is connected to the drain terminal of the eighth field effect transistor.

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