Multi-load wireless power transmission system with constant current-constant voltage output

Abstract

The invention discloses a multi-load wireless electric energy transmission system with constant current-constant voltage output. The multi-load wireless electric energy transmission system comprises an electric energy sending end and a plurality of electric energy receiving ends, the electric energy transmitting end is formed by sequentially connecting a DC power supply, a full-bridge inverter and an LCC-S type compensation network; and the electric energy receiving end is formed by sequentially connecting a receiving side compensation network, a rectifier bridge and an electric energy output end. According to the invention, switching from a constant current output mode to a constant voltage output mode can be realized through simple frequency switching, which is beneficial to simplifying control of the system; meanwhile, the constant current-constant voltage output switching method provided by the invention is suitable for the multi-load wireless power transmission system, the input impedance angle of the system is 0 in a constant current (constant voltage) working mode, the reactive component of the system is less, and the efficiency is high; in addition, additional switching devices do not need to be added, and miniaturization and light weight of a wireless electric energy transmission system of the underwater vehicle are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless power transmission, and in particular relates to a multi-load wireless power transmission system with constant current-constant voltage output. Background Art

[0002] The development of wireless power transmission technology provides a new way to power underwater vehicles: when the underwater vehicle is about to run out of power, it can sail to a nearby charging platform to recharge through wireless power transmission, which improves the maneuverability and endurance of underwater vehicles. Underwater vehicles usually perform complex tasks in the form of clusters, so how to perform wireless power transmission for multiple underwater vehicles has become the focus of current research.

[0003] In addition, the constant current-constant voltage charging mode can charge more power into the battery, improve the charging speed and safety. However, at present, there is little research on achieving constant current-constant voltage output for multi-load wireless power transmission systems. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and provides the following solutions:

[0005] A multi-load wireless power transmission system with constant current-constant voltage output includes: a power transmitting end and a plurality of power receiving ends;

[0006] The power transmission end is composed of a DC power supply, a full-bridge inverter and an LCC-S type compensation network connected in sequence;

[0007] The electric energy receiving end is composed of a receiving side compensation network, a rectifier bridge and an electric energy output end connected in sequence.

[0008] Preferably, in the power transmitting end:

[0009] The full-bridge inverter is composed of four switch tubes connected;

[0010] The LCC-S type compensation network is composed of a transmitting end compensation inductor, two transmitting end compensation capacitors, two transmitting end resistors and a power transmitting coil.

[0011] Preferably, in the power receiving end:

[0012] The receiving side compensation network is composed of a receiving end compensation capacitor, a receiving end resistor and a power receiving coil;

[0013] The rectifier bridge is composed of 4 diodes connected;

[0014] The electric energy output end is provided with a filter capacitor.

[0015] Preferably, the inductance value L of the power transmission coil is set p and the inductance value L of the power receiving coil s , and calculate the mutual inductance M of the power transmitting coil and the power receiving coil ps , and the cross-coupling M of the power receiving coils ss ;

[0016] Set the operating frequency ω in constant voltage charging mode cv , and based on the inductance value L p , the inductance value L s , the mutual inductance M ps and the cross coupling M ss , calculate the inductance value of the transmitter compensation inductor, the capacitance value of the transmitter compensation capacitor, and the capacitance value of the receiver compensation capacitor:

[0017] ,

[0018] ,

[0019] ,

[0020] ,

[0021] ,

[0022] Among them, L f is the inductance value of the transmitter compensation inductor, C f and C p is the capacitance value of the two transmitter compensation capacitors, C s is the capacitance value of the compensation capacitor at the receiving end, ω cc It is the operating frequency in constant current charging mode.

[0023] Preferably, the operating mode of the system is controlled by adjusting the operating frequency of the system:

[0024] Adjust the system's operating frequency to ω cv When , the system is in constant voltage charging mode;

[0025] Adjust the system's operating frequency to ω cc The system is in constant current charging mode.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention can realize the switching from constant current output to constant voltage output mode by simply switching the frequency, which is beneficial to simplify the control of the system; at the same time, the constant current-constant voltage output switching method proposed by the present invention is suitable for a multi-load wireless power transmission system and the system input impedance angle is 0 in the constant current (constant voltage) working mode, the system has a small reactive component and high efficiency; furthermore, the present invention does not require the addition of additional switching devices, which is beneficial to the miniaturization and lightweight of the underwater vehicle wireless power transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 Schematic diagram of a system circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example

[0033] In this embodiment, if Figure 1 As shown, a multi-load wireless power transmission system with constant current-constant voltage output includes: a power transmitting end and a plurality of power receiving ends;

[0034] The power transmitting end is composed of a DC power supply, a full-bridge inverter and an LCC-S type compensation network connected in sequence; the power receiving end is composed of a receiving side compensation network, a rectifier bridge and a power output end connected in sequence.

[0035] At the power sending end: the full-bridge inverter is composed of 4 switching tubes connected; the LCC-S type compensation network is composed of 1 sending end compensation inductor, 2 sending end compensation capacitors, 2 sending end resistors and 1 power sending coil.

[0036] In this embodiment, if Figure 1As shown in the figure, the full-bridge inverter is composed of four switch tubes, S1, S2, S3 and S4, and the LCC-S type compensation network is composed of the sending end compensation inductor L f , Transmitter compensation capacitor C f , Transmitter compensation capacitor C p , sending end inductor R f , sending end inductor R p and power sending coil L p constitute.

[0037] In this embodiment, a number of power receiving terminals are provided, such as Figure 1 As shown in the figure, in the power receiving end: the receiving side compensation network is composed of a receiving end compensation capacitor, a receiving end resistor and a power receiving coil; the rectifier bridge is composed of four diodes connected; and a filter capacitor is set at the power output end. Specifically, the receiving side compensation network is composed of the receiving end compensation capacitor C sn , Receiving end resistance R sn and power receiving coil L sn Connection, the rectifier bridge is composed of D n1 , D n2 , D n3 and D n4 The filter capacitors are composed of C r express.

[0038] The following calculates the component values ​​of each compensation component in the circuit:

[0039] Set the inductance value L of the power sending coil p and the inductance value L of the power receiving coil s , and calculate the mutual inductance M of the power sending coil and the power receiving coil ps , and the cross-coupling M of several power receiving coils ss ;

[0040] Set the operating frequency ω in constant voltage charging mode cv , and based on the inductance value L p , inductance value L s 、M ps and cross-coupling M ss , calculate the inductance value of the transmitter compensation inductor, the capacitance value of the transmitter compensation capacitor, and the capacitance value of the receiver compensation capacitor:

[0041] ,

[0042] ,

[0043] ,

[0044] ,

[0045] ,

[0046] Among them, L f is the inductance value of the transmitter compensation inductor, C f and C p is the capacitance value of the two transmitter compensation capacitors, C s is the capacitance value of the compensation capacitor at the receiving end, ω cc It is the operating frequency in constant current charging mode.

[0047] In this embodiment, the operating mode of the system is controlled by adjusting the operating frequency: the operating frequency of the system is adjusted to ω cv When the system is in constant voltage charging mode, the system operating frequency is adjusted to ω cc The system is in constant current charging mode.

[0048] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A multi-load wireless power transmission system with constant current-constant voltage output, characterized in that: include: An electric energy transmitting end and a plurality of electric energy receiving ends; The power transmission end is composed of a DC power supply, a full-bridge inverter and an LCC-S type compensation network connected in sequence; The electric energy receiving end is composed of a receiving side compensation network, a rectifier bridge and an electric energy output end connected in sequence.

2. According to claim 1, a multi-load wireless power transmission system with constant current-constant voltage output is characterized in that: In the electric energy sending end: The full-bridge inverter is composed of four switch tubes connected; The LCC-S type compensation network is composed of a transmitting end compensation inductor, two transmitting end compensation capacitors, two transmitting end resistors and a power transmitting coil.

3. According to claim 2, a multi-load wireless power transmission system with constant current-constant voltage output is characterized in that: In the power receiving end: The receiving side compensation network is composed of a receiving end compensation capacitor, a receiving end resistor and a power receiving coil; The rectifier bridge is composed of 4 diodes connected; The electric energy output end is provided with a filter capacitor.

4. A multi-load wireless power transmission system with constant current-constant voltage output according to claim 3, characterized in that: Set the inductance value L of the power sending coil p and the inductance value L of the power receiving coil s , and calculate the mutual inductance M of the power sending coil and the power receiving coil ps , and the cross-coupling M of the plurality of power receiving coils ss ; Set the operating frequency ω in constant voltage charging mode cv , and based on the inductance value L p , the inductance value L s , the mutual inductance M ps and the cross coupling M ss , calculate the inductance value of the transmitter compensation inductor, the capacitance value of the transmitter compensation capacitor, and the capacitance value of the receiver compensation capacitor: ， ， ， ， ， Among them, L f is the inductance value of the transmitter compensation inductor, C f and C p is the capacitance value of the two transmitter compensation capacitors, C s is the capacitance value of the compensation capacitor at the receiving end, ω cc It is the operating frequency in constant current charging mode.

5. A multi-load wireless power transmission system with constant current-constant voltage output according to claim 4, characterized in that: Control the system's operating mode by adjusting the system's operating frequency: Adjust the system's operating frequency to ω cv When , the system is in constant voltage charging mode; Adjust the system's operating frequency to ω cc The system is in constant current charging mode.

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