Wireless energy transmission system suitable for rotating shaft end of platform system

Abstract

The invention discloses a wireless energy transmission system suitable for a rotating shaft end of a platform system. The wireless energy transmission system comprises a transmitting end circuit, a receiving end circuit and a coupler, wherein the transmitting end circuit is connected with the receiving end circuit through the coupler. The reliability and the stability of the platform system are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of platform inertial systems, and in particular relates to a wireless energy transmission system suitable for a rotating shaft end of a platform system. Background Art

[0002] The platform inertial system is the basis for inertial navigation, and is composed of a platform assembly, an axis end assembly, a frame structure, and a circuit. In the platform inertial system, the gyro senses the angle information, and the frame rotation is controlled through the stable loop control technology to form a platform that is stable in the inertial space. The accelerometer on the platform senses the acceleration information, thereby realizing the navigation function. The inertial sensors and circuit components on the platform need to be powered. Due to the rotation of the frame, the internal and external circuits of the platform cannot be directly connected by wires. The traditional axis end assembly uses a conductive slip ring, which can meet the line connection under rotating conditions. However, with the development of the platform system, the functions have become increasingly complex, and the number of conductive slip rings has gradually increased, which has brought a series of quality problems, such as data jump problems caused by false contact, and the problem of reduced stability control accuracy caused by the friction torque interference of the slip ring.

[0003] Currently, in the field of platform inertial system technology, there is no effective method to solve the above problems caused by conductive slip rings. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a wireless energy transmission system suitable for the rotating shaft end of a platform system, and to improve the reliability and stability of the platform system.

[0005] The purpose of the present invention is achieved through the following technical scheme: a wireless energy transmission system suitable for the rotating shaft end of a platform system, comprising: a transmitting circuit, a receiving circuit and a coupler; wherein the transmitting circuit is connected to the receiving circuit through the coupler.

[0006] In the above-mentioned wireless energy transmission system applicable to the rotating shaft end of the platform system, the transmitting end circuit inverts DC power into AC power and transmits the AC power to the coupler; the coupler receives AC power and transmits the AC power to the receiving end circuit through electromagnetic induction; the receiving end circuit receives AC power, converts the AC power into DC voltage, and then outputs the DC voltage stably.

[0007] The above-mentioned wireless energy transmission system applicable to the rotating shaft end of the platform system also includes: a polyimide bracket; wherein the coupler is arranged on the polyimide bracket.

[0008] In the wireless energy transmission system applicable to the rotating shaft end of the platform system, the transmitting end circuit includes MOSFET tube Q1, MOSFET tube Q2, MOSFET tube Q3, MOSFET tube Q4, diode D1, diode D2, diode D3, diode D4, capacitor C1, capacitor C2, capacitor C3 and capacitor C4; wherein, the drain of the MOSFET tube Q1, the cathode of the diode D1 and one end of the capacitor C1 are all connected; the source of the MOSFET tube Q1, the anode of the diode D1 and the other end of the capacitor C1 are all connected; the drain of the MOSFET tube Q2, the cathode of the diode D2 and one end of the capacitor C2 are all connected; the source of the MOSFET tube Q2, the anode of the diode D2 and the other end of the capacitor C2 are all connected; the MOSFET tube Q2 is connected to the cathode of the diode D2, and the other end of the capacitor C2. The drain of the T tube Q3, the cathode of the diode D3 and one end of the capacitor C3 are all connected; the source of the MOSFET tube Q3, the anode of the diode D3 and the other end of the capacitor C3 are all connected; the drain of the MOSFET tube Q4, the cathode of the diode D4 and one end of the capacitor C4 are all connected; the source of the MOSFET tube Q4, the anode of the diode D4 and the other end of the capacitor C4 are all connected; the drain of the MOSFET tube Q1 is connected to the drain of the MOSFET tube Q3; the source of the MOSFET tube Q1 is connected to the drain of the MOSFET tube Q2; the source of the MOSFET tube Q2 is connected to the source of the MOSFET tube Q4; the source of the MOSFET tube Q3 is connected to the drain of the MOSFET tube Q4.

[0009] In the above-mentioned wireless energy transmission system suitable for the rotating shaft end of the platform system, the coupler includes a capacitor Cp, a capacitor Cs, a coil Ip and a coil Is; wherein, one end of the capacitor Cp is connected to one end of the coil Ip, and the other end of the capacitor Cp is respectively connected to the source of the MOSFET tube Q1 and the drain of the MOSFET tube Q2; the other end of the coil Ip is respectively connected to the source of the MOSFET tube Q3 and the drain of the MOSFET tube Q4; one end of the capacitor Cs is connected to one end of the coil Is, and the other end of the capacitor Cs is connected to the receiving end circuit; the other end of the coil Is is connected to the receiving end circuit.

[0010] In the above-mentioned wireless energy transmission system applicable to the rotating shaft end of the platform system, the receiving end circuit includes a rectifier and a DC / DC converter; wherein the rectifier is connected to the coupler, and the rectifier is connected to the DC / DC converter; the rectifier converts AC power into DC voltage, and transmits the DC voltage to the DC / DC converter; and the DC / DC converter outputs the DC voltage stably.

[0011] In the above-mentioned wireless energy transmission system applicable to the rotating shaft end of the platform system, the voltage of the DC power received by the transmitting end circuit is 25V~32V, and the DC voltage output by the transmitting end circuit is 25V~32V.

[0012] In the above wireless energy transmission system applicable to the rotating shaft end of the platform system, the capacitor C1 is 200nF-500nF, the capacitor C2 is 200nF-500nF, the capacitor C3 is 200nF-500nF, and the capacitor C4 is 200nF-500nF.

[0013] In the above-mentioned wireless energy transmission system applicable to the rotating shaft end of the platform system, the capacitor Cp is 350nF-450nF, the capacitor Cs is 650nF-750nF, the number of turns of the coil Ip is 12-18 turns, and the number of turns of the coil Is is 12-18 turns.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention replaces the traditional conductive slip ring at the shaft end, fundamentally solves a series of problems caused by the conductive slip ring, and improves the reliability and stability of the platform system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0017] Figure 1 It is a structural block diagram of a wireless energy transmission system applicable to a rotating shaft end of a platform system provided by an embodiment of the present invention;

[0018] Figure 2 is a circuit diagram of a transmitting end circuit provided by an embodiment of the present invention;

[0019] Figure 3 is a circuit diagram of a coupler provided by an embodiment of the present invention;

[0020] Figure 4 It is a schematic diagram of the structure of a coupler provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] Figure 1 1 is a block diagram of a wireless energy transmission system applicable to a rotating shaft end of a platform system provided by an embodiment of the present invention. Figure 1 As shown, the wireless energy transmission system suitable for the rotating shaft end of the platform system includes: a transmitting end circuit, a receiving end circuit and a coupler; wherein the transmitting end circuit is connected to the receiving end circuit through the coupler.

[0023] The transmitting end circuit inverts DC power into AC power and transmits the AC power to the coupler; the coupler receives the AC power and transmits the AC power to the receiving end circuit through electromagnetic induction; the receiving end circuit receives the AC power, converts the AC power into DC voltage, and then outputs the DC voltage stably.

[0024] The wireless energy transmission system suitable for the rotating shaft end of the platform system also includes: a polyimide bracket; wherein the coupler is arranged on the polyimide bracket.

[0025] like Figure 2As shown, the sending end circuit includes MOSFET tube Q1, MOSFET tube Q2, MOSFET tube Q3, MOSFET tube Q4, diode D1, diode D2, diode D3, diode D4, capacitor C1, capacitor C2, capacitor C3 and capacitor C4; wherein, the drain of the MOSFET tube Q1, the cathode of the diode D1 and one end of the capacitor C1 are all connected; the source of the MOSFET tube Q1, the anode of the diode D1 and the other end of the capacitor C1 are all connected; the drain of the MOSFET tube Q2, the cathode of the diode D2 and one end of the capacitor C2 are all connected; the source of the MOSFET tube Q2, the anode of the diode D2 and the other end of the capacitor C2 are all connected; the drain of the MOSFET tube Q3, the The cathode of the diode D3 and one end of the capacitor C3 are all connected; the source of the MOSFET tube Q3, the anode of the diode D3 and the other end of the capacitor C3 are all connected; the drain of the MOSFET tube Q4, the cathode of the diode D4 and one end of the capacitor C4 are all connected; the source of the MOSFET tube Q4, the anode of the diode D4 and the other end of the capacitor C4 are all connected; the drain of the MOSFET tube Q1 is connected to the drain of the MOSFET tube Q3; the source of the MOSFET tube Q1 is connected to the drain of the MOSFET tube Q2; the source of the MOSFET tube Q2 is connected to the source of the MOSFET tube Q4; the source of the MOSFET tube Q3 is connected to the drain of the MOSFET tube Q4.

[0026] like Figure 3 As shown, the coupler includes a capacitor Cp, a capacitor Cs, a coil Ip and a coil Is; wherein, one end of the capacitor Cp is connected to one end of the coil Ip, and the other end of the capacitor Cp is respectively connected to the source of the MOSFET tube Q1 and the drain of the MOSFET tube Q2; the other end of the coil Ip is respectively connected to the source of the MOSFET tube Q3 and the drain of the MOSFET tube Q4; one end of the capacitor Cs is connected to one end of the coil Is, and the other end of the capacitor Cs is connected to the receiving end circuit; the other end of the coil Is is connected to the receiving end circuit.

[0027] The receiving end circuit includes a rectifier and a DC / DC converter; wherein the rectifier is connected to the coupler, and the rectifier is connected to the DC / DC converter; the rectifier converts AC power into DC voltage and transmits the DC voltage to the DC / DC converter; the DC / DC converter outputs the DC voltage stably.

[0028] The voltage of the direct current received by the sending end circuit is 25V-32V, and the direct current voltage output by the sending end circuit is 25V-32V.

[0029] The capacitor C1 is 200nF-500nF, the capacitor C2 is 200nF-500nF, the capacitor C3 is 200nF-500nF, and the capacitor C4 is 200nF-500nF.

[0030] The capacitor Cp is 350nF-450nF, the capacitor Cs is 650nF-750nF, the number of turns of the coil Ip is 12-18 turns, and the number of turns of the coil Is is 12-18 turns.

[0031] The input voltage of the transmitting circuit is 25V~32V, and a full-bridge inverter structure circuit is used to invert DC power into AC power. The inverter frequency varies from 90kHz to 130kHz according to coupling parameters, load conditions and other parameters. The drive uses a microprocessor to generate PWM with corresponding frequency and duty cycle.

[0032] The receiving circuit adopts a full-bridge rectifier structure to realize the function of converting the receiving end resonant alternating voltage into DC voltage, and then realizes the stable output of the power supply voltage through the DC / DC voltage regulator chip.

[0033] The coupler is a pair of pot-shaped magnetic cores, which are the transmitting end magnetic core and the receiving end magnetic core, respectively connected to the transmitting end circuit and the receiving end circuit. The coil is wound in the groove of the pot-shaped coupler, and the number of turns and inductance can be designed according to the power frequency peak current. The transmitting end coupler cooperates with the resonant capacitor on the circuit board to achieve circuit resonance, thereby realizing energy transfer with the receiving end coupler through electromagnetic induction.

[0034] The polyimide bracket is a pair of fixed tooling made of polyimide material, which is used to fix the transmitting end magnetic core and the receiving end magnetic core. The magnetic core is fixed in the bracket original tube structure. A pair of brackets are respectively fixed to the transmitting end circuit and the receiving end circuit. After installation, the two magnetic cores can be parallel to each other in space without contact.

[0035] The input voltage of the wireless energy transmission system is 25V~32V, the output voltage is 25V~32V, and the output ripple is ≤200mV.

[0036] The output power of the wireless energy transmission system is not less than 100W, the output efficiency is not less than 75%, and the inverter frequency is 90kHz~130kHz.

[0037] The size envelope of the wireless energy transmission system is no more than 70mm in diameter and no more than 40mm in thickness. The transmitting end circuit is a circular structure with a diameter of no more than 70mm and a thickness of no more than 15mm. The receiving end circuit is a circular structure with a diameter of no more than 70mm and a thickness of no more than 15mm.

[0038] The coupler is a pot-shaped structure with a diameter not exceeding 33 mm and a thickness not exceeding 19.5 mm. The transmitting end magnetic core and the receiving end magnetic core are non-contacting, parallel and coaxially opposite to each other with a spacing of 1 to 2 mm.

[0039] The polyimide bracket is a cylindrical structure, with the magnetic core fixed on one side of the cylinder and a mounting hole extending from the circular surface on the other side for fixing on the circuit board.

[0040] The transmitting end polyimide bracket is fixed through a mounting hole reserved on a receiving end circuit board. The receiving end circuit includes a rectifier and a DC / DC converter, and the receiving end polyimide bracket is fixed through a mounting hole reserved on a receiving end circuit board.

[0041] like Figure 1 As shown, the wireless energy transmission system consists of a transmitter circuit, a receiver circuit, a coupler and a polyimide bracket. The input voltage of the wireless energy transmission system is 25 to 32V, which is connected from the transmitter circuit. The mounting hole of the transmitter polyimide bracket is fixed with the mounting hole of the transmitter circuit by screws. The magnetic cores at both ends are coaxially fixed in the polyimide bracket cylinders at both ends, parallel and opposite to each other in a non-contact manner. The mounting hole of the receiving polyimide bracket is also fixed to the transmitter circuit by screws, and the transmitter circuit outputs a voltage of 25 to 32V.

[0042] like Figure 2 As shown in the figure, the transmitter circuit of the wireless energy transmission system adopts a full-bridge inverter circuit, uses MOSFET as the power switch tube of the full-bridge inverter, and drives a microprocessor to generate PWM with corresponding frequency and duty cycle. The wireless energy transmission control strategy has a decisive influence on the system transmission efficiency and output voltage stability. Therefore, the wireless energy transmission full-bridge drive control uses the leakage inductance of the coupler to achieve zero voltage of the switch tube. The full-bridge topology is as follows Figure 3 As shown, the voltage stress of the switch tube in this topology is relatively small, and the inverter efficiency can be improved by realizing zero voltage conduction of the switch tube. In the figure, Q1, Q2, Q3, and Q4 are power Mosfet, and C1, C2, C3, and C4 are output junction capacitors.

[0043] C1=C2=C3=C4=4 / 3Coss (Coss is the output capacitance of Mosfet)

[0044] The driving waveform of the full-bridge topology can achieve a phase shift of 0 to 180°. The purpose of controlling the input resonant cavity energy can be achieved by changing the phase shift angle. When Q1 and Q3 or Q2 and Q4 are turned on at the same time, electric energy is input into the resonant cavity, and the Mosfet junction capacitance is charged and discharged through leakage inductance energy storage, providing conditions for the next zero-voltage conduction. The Mosfet anti-parallel diode acts as a freewheeling diode to provide a resonant circuit.

[0045] In addition to using phase-shifted full-bridge control to achieve zero-voltage turn-on of the switch tube, based on the characteristics of constant voltage at the receiving end coil when the wireless energy transmission transmitter coil is constant current, wireless energy transmission also achieves constant control of the peak-to-peak value of the transmitter coil current by controlling the duty cycle through resonant coil current sampling feedback.

[0046] like Figure 3 As shown, the original secondary side compensation circuit adopts a series-series compensation method, the compensation capacitor value is independent of the load value, and the output voltage is less affected by the load when the input current value is constant.

[0047] The receiving circuit of the wireless energy transmission system adopts a full-bridge rectifier structure to realize the function of converting the receiving end resonant alternating voltage into DC voltage, and then realizes the stable output of 25V~32V power supply voltage through the DC / DC voltage regulator chip.

[0048] like Figure 4 As shown, the coupler is a pot-type structure, the coil is wound in the groove of the pot-type coupler, the coil adopts Litz wire, the diameter of the coupler does not exceed 33mm, and the thickness does not exceed 15mm.

[0049] The above description is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

[0050] The wireless energy transmission system of the rotating shaft end of the platform system of this embodiment can be applied to the shaft end structure of the platform system. Due to the similarity of the shaft end structure of the platform system, the compensation method of this embodiment can be widely applied to various platform systems, including single-axis platform, single-frame dual-axis platform, dual-frame three-axis platform, three-frame four-axis platform, etc., with a wide range of applications and certain promotional value. Taking into account the differences in the shaft end sizes of various platforms, this embodiment makes the wireless energy transmission system circular, reduces the circuit structure size and the magnetic core size, and ensures that the output power can meet the use requirements of all platform systems. This embodiment eliminates the interference of the friction torque of the conductive slip ring and improves the control accuracy of the stable loop.

[0051] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A wireless energy transmission system suitable for the rotating shaft end of a platform system, characterized in that include: A transmitting end circuit, a receiving end circuit and a coupler; wherein the transmitting end circuit is connected to the receiving end circuit through the coupler.

2. The wireless energy transmission system suitable for the rotating shaft end of the platform system according to claim 1, characterized in that: The transmitting end circuit inverts the direct current into alternating current and transmits the alternating current to the coupler; The coupler receives alternating current and transmits the alternating current to the receiving end circuit through electromagnetic induction; The receiving end circuit receives alternating current, converts the alternating current into a direct current voltage, and then outputs the direct current voltage in a stable manner.

3. The wireless energy transmission system suitable for the rotating shaft end of the platform system according to claim 1, characterized in that Also includes: Polyimide bracket; wherein the coupler is arranged on the polyimide bracket.

4. The wireless energy transmission system applicable to the rotating shaft end of the platform system according to claim 1, characterized in that: The transmitting end circuit includes MOSFET tube Q1, MOSFET tube Q2, MOSFET tube Q3, MOSFET tube Q4, diode D1, diode D2, diode D3, diode D4, capacitor C1, capacitor C2, capacitor C3 and capacitor C4; wherein, The drain of the MOSFET tube Q1, the cathode of the diode D1 and one end of the capacitor C1 are all connected; The source of the MOSFET tube Q1, the positive electrode of the diode D1 and the other end of the capacitor C1 are all connected; The drain of the MOSFET tube Q2, the cathode of the diode D2 and one end of the capacitor C2 are all connected; The source of the MOSFET tube Q2, the positive electrode of the diode D2 and the other end of the capacitor C2 are all connected; The drain of the MOSFET tube Q3, the cathode of the diode D3 and one end of the capacitor C3 are all connected; The source of the MOSFET tube Q3, the positive electrode of the diode D3 and the other end of the capacitor C3 are all connected; The drain of the MOSFET tube Q4, the cathode of the diode D4 and one end of the capacitor C4 are all connected; The source of the MOSFET tube Q4, the positive electrode of the diode D4 and the other end of the capacitor C4 are all connected; The drain of the MOSFET tube Q1 is connected to the drain of the MOSFET tube Q3; The source of the MOSFET tube Q1 is connected to the drain of the MOSFET tube Q2; The source electrode of the MOSFET tube Q2 is connected to the source electrode of the MOSFET tube Q4; The source of the MOSFET tube Q3 is connected to the drain of the MOSFET tube Q4.

5. The wireless energy transmission system applicable to the rotating shaft end of the platform system according to claim 4, characterized in that: The coupler includes a capacitor Cp, a capacitor Cs, a coil Ip and a coil Is; wherein, One end of the capacitor Cp is connected to one end of the coil Ip, and the other end of the capacitor Cp is connected to the source of the MOSFET tube Q1 and the drain of the MOSFET tube Q2 respectively; The other end of the coil Ip is connected to the source of the MOSFET tube Q3 and the drain of the MOSFET tube Q4 respectively; One end of the capacitor Cs is connected to one end of the coil Is, and the other end of the capacitor Cs is connected to the receiving end circuit; The other end of the coil Is is connected to the receiving end circuit.

6. The wireless energy transmission system applicable to the rotating shaft end of the platform system according to claim 1, characterized in that: The receiving end circuit includes a rectifier and a DC / DC converter; wherein the rectifier is connected to the coupler, and the rectifier is connected to the DC / DC converter; The rectifier converts the AC power into a DC voltage and transmits the DC voltage to the DC / DC converter; The DC / DC converter outputs a stable DC voltage.

7. The wireless energy transmission system applicable to the rotating shaft end of the platform system according to claim 2, characterized in that: The voltage of the direct current received by the transmitting end circuit is 25V-32V, and the direct current voltage output by the transmitting end circuit is 25V-32V.

8. The wireless energy transmission system applicable to the rotating shaft end of the platform system according to claim 4, characterized in that: The capacitor C1 is 200nF-500nF, the capacitor C2 is 200nF-500nF, the capacitor C3 is 200nF-500nF, and the capacitor C4 is 200nF-500nF.

9. The wireless energy transmission system applicable to the rotating shaft end of the platform system according to claim 5, characterized in that: The capacitor Cp is 350nF-450nF, the capacitor Cs is 650nF-750nF, the number of turns of the coil Ip is 12-18 turns, and the number of turns of the coil Is is 12-18 turns.

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