Satellite SADM wireless power transmission device and detection circuit

Abstract

The application provides a satellite SADM wireless power transmission device and a detection circuit. The device comprises: a primary side circuit located outside a satellite cabin and installed on a solar sail; a transmitting coil L 1 installed on a movable end of a solar sail driving mechanism; a receiving coil L 2 installed on a fixed end of the solar sail driving mechanism; a secondary side circuit located inside the satellite cabin and installed at an in-orbit power system. The transmitting coil L 1 is arranged to rotate at the same speed and polarity as the solar sail. The transmitting coil L 1 and the receiving coil L 2 are both disc structures and are formed on one side of a magnetically conductive alloy disc. The transmitting coil L 1 and the receiving coil L 2 are arranged in parallel and have a preset air gap therebetween. The detection circuit comprises two MCUs and a plurality of current and voltage detection circuits and is used for forming a closed loop detection control.

Description

Technical Field

[0001] This application belongs to the field of aerospace and satellite technology, and relates to satellite power transmission, specifically to a satellite SADM wireless power transmission device and its detection circuit. Background Technology

[0002] Commercial satellites employ Solar Panel Drive Mechanisms (SADMs) for power transmission, transferring the electrical energy generated by the solar panels to the satellite's interior. A SADM is a typical space rotation mechanism, typically using conductive slip rings to transfer power between moving and stationary components, and capable of continuous 360-degree rotation. The conductive slip rings, which connect the moving and stationary components through contact friction, are susceptible to risks such as momentary interruptions, open circuits, and short circuits, leading to reduced power output or even malfunctions. To overcome these risks and ensure the reliability and lifespan of the conductive slip rings in orbit, their component manufacturing and assembly require high precision and specific process and procedure requirements. This results in long manufacturing cycles and high costs for conductive slip rings, hindering the rapid delivery and cost control required for solar panel drive mechanisms, thus limiting their widespread application in low-cost commercial satellite constellation construction. Utility Model Content

[0003] To address the shortcomings of the aforementioned prior art, this application provides a satellite SADM wireless power transmission device and detection circuit. The device mounts the primary side circuit on the solar panel and the secondary side circuit on the satellite power supply. Only the coil is retained inside the SADM, enabling wireless power transmission, reducing the pressure on heat dissipation design, and simplifying the assembly process, which is conducive to mass production.

[0004] To achieve the above objectives, the present invention employs the following technology:

[0005] A satellite SADM wireless power transmission device, comprising:

[0006] The primary circuit, located outside the satellite module and mounted on the solar panel, is used to receive the DC power output from the solar panel's battery array. U dc And convert it into high-frequency AC power. U ac ;

[0007] transmitter coil L 1. Installed at the moving end of the solar panel drive mechanism, used to transmit the high-frequency AC power output from the primary circuit. U ac Converted into magnetic energy;

[0008] Receiver coil L 2. Installed on the fixed end of the solar panel drive mechanism, used to connect the transmitter coil. L1. The converted magnetic energy is converted into alternating electrical energy;

[0009] The secondary circuit, located inside the satellite cabin and installed in the satellite's power system, is used to power the receiver coil. L 2. Output alternating electrical energy and convert it into direct current. U out Output to the load.

[0010] Furthermore, the transmitting coil L 1. Rotate with the same speed and polarity as the solar panel.

[0011] Furthermore, the transmitting coil L 1 and receiving coil L The inductance values ​​of 2 are the same.

[0012] Furthermore, the transmitting coil L 1 and receiving coil L Both are disc-shaped structures, formed around one side of a magnetic alloy disc.

[0013] Furthermore, the transmitting coil L 1 and receiving coil L 2. They are arranged in parallel with a preset air gap between them, which serves as an energy transfer space.

[0014] Furthermore, the primary-side circuit includes a high-frequency inverter and a primary-side compensation network, which in turn includes a secondary-side compensation network and a high-frequency rectifier. One end of the high-frequency inverter is connected to the output terminal of the solar panel's battery array, and the other end is connected to the primary-side compensation network. The primary-side compensation network is connected to the transmitter coil. L 1. One end of the high-frequency rectifier is connected to the secondary-side compensation network, and the other end is connected to the load. The secondary-side compensation network is connected to the receiving coil. L 2. Primary-side compensation networks and secondary-side compensation networks are used to improve power factor and reduce losses.

[0015] A detection circuit for a satellite SADM wireless power transmission device includes:

[0016] The first MCU and the first current detection circuit, the second current detection circuit, and the first voltage detection circuit connected thereto;

[0017] The second MCU and the third current detection circuit, the fourth current detection circuit, and the second voltage detection circuit connected thereto;

[0018] The first current detection circuit is used to detect the input current of the high-frequency inverter, the first voltage detection circuit is used to detect the input voltage of the high-frequency inverter, and the second current detection circuit is used to detect the current flowing through the transmitting coil. LThe first MCU is used to output a high-frequency control signal to the high-frequency inverter based on the detection data from the first current detection circuit, the second current detection circuit, and the first voltage detection circuit, so as to realize the current of the transmitting coil. L 1. Closed-loop control of electrical energy;

[0019] The third current detection circuit is used to detect the flow of runoff through the receiving coil. L The second current detection circuit is used to detect the output current of the high-frequency rectifier, the second voltage detection circuit is used to detect the output voltage of the high-frequency rectifier, and the second MCU is used to output a high-frequency control signal to the high-frequency rectifier based on the detection data of the third current detection circuit, the third current detection circuit and the second voltage detection circuit, so as to realize closed-loop control of output voltage and current.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. Compared with the existing technology that places the entire wireless transmission circuit inside the SADM, the present invention installs the primary side circuit on the solar panel and the secondary side circuit on the satellite power supply, leaving only the coil inside the SADM, which realizes wireless power transmission while reducing the pressure of heat dissipation design.

[0022] 2. Compared with the existing technology that uses inner and outer cylinder structures to form the transmitting and receiving coils, which has problems such as poor heat dissipation and high requirements for coaxiality and taper during assembly, the present invention adopts a disc structure and is installed in parallel, respectively located at the moving end and fixed end of the solar panel drive mechanism. This not only facilitates heat dissipation, but also simplifies the assembly process by only ensuring parallelism during assembly, which is conducive to mass production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the satellite SADM wireless power transmission device according to an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the detection circuit structure of the satellite SADM wireless power transmission device according to an embodiment of this application. Detailed Implementation

[0025] To make the objectives, technical solutions and advantages of the present utility model clearer, the implementation methods of the present utility model will be described in detail below with reference to the accompanying drawings. However, the embodiments described in the present utility model are only some embodiments of the present utility model, and not all embodiments.

[0026] Wireless Power Transmission (WPT) is a non-contact method of power transmission. Power is emitted from the transmitter and transmitted to the receiver via a space medium (electric field, magnetic field, etc.). In commercial satellites, this method can avoid the problems caused by contact friction and achieve high reliability, long life, low cost, and fast delivery for space rotating mechanisms such as solar panel drive mechanisms.

[0027] Key components of wireless power transmission devices generally include the primary circuit and the transmitting coil. L 1. Receiver coil L 2. Secondary circuitry. The efficiency of the wireless power transfer device is approximately 90%. Assuming a 1kW transmission power from the SADM solar panel drive mechanism, the system-level power consumption is approximately 100W. The significant heat generated by this system-level loss is difficult to dissipate through conduction and radiation; therefore, it is necessary to reduce the internal losses of the solar panel drive mechanism.

[0028] This application provides a satellite SADM wireless power transmission device, in which only the transmitter coil is retained inside the SADM solar panel drive mechanism. L 1 and receiving coil L 2. Install the primary and secondary circuits in other standalone products.

[0029] Specifically, such as Figure 1 As shown, the primary circuit is located outside the satellite module and mounted on the solar panel, used to receive the DC power output from the solar panel's battery array. U dc And convert it into high-frequency AC power. U ac .

[0030] transmitter coil L 1. Installed at the movable end of the SADM (Solar Panel Drive Mechanism), it is controlled by the drive source to rotate at the same speed and with the same polarity as the solar panel, enabling continuous 360-degree rotation for both positive and negative polarities. (Transmitter coil) L 1. A high-frequency AC power supply for outputting from the primary circuit. U ac It is converted into magnetic energy.

[0031] Receiver coil L 2. Installed on the SADM fixed end of the solar panel drive mechanism, used to connect the transmitter coil. L 1. The converted magnetic energy is converted into alternating electrical energy.

[0032] The secondary circuitry is located inside the satellite cabin, installed at the satellite's internal power system, and is used to power the receiver coil. L 2. Output alternating electrical energy and convert it into direct current. U outOutput to the load.

[0033] Specifically, the primary side circuit includes a high-frequency inverter and a primary side compensation network, which in turn includes a secondary side compensation network and a high-frequency rectifier. One end of the high-frequency inverter is connected to the output terminal of the solar panel's battery array, and the other end is connected to the primary side compensation network. The primary side compensation network is connected to the transmitter coil. L 1. One end of the high-frequency rectifier is connected to the secondary-side compensation network, and the other end is connected to the load. The secondary-side compensation network is connected to the receiving coil. L 2. Primary and secondary compensation networks are used to improve power factor and reduce losses. Both networks employ a common LCC topology and use the same structure, including an inductor, a first capacitor connected in series with the inductor, and a second capacitor connected in parallel with the inductor. The inductor and capacitor values ​​are identical in both topologies. Specific parameter selection depends on the high-frequency AC power supply. U ac Frequency-dependent, calculated based on the cutoff frequency.

[0034] Solar panel array output DC power U dc The voltage amplitude is 42V±5V. This DC power supply U dc Transmitted to a high-frequency inverter and converted into high-frequency AC power. U ac The frequency is 50kHz. High-frequency AC power supply. U ac After passing through the primary compensation network, the alternating current flows through the transmitting coil. L 1. An alternating magnetic field is generated. This magnetic field flows through the transmitting coil. L The current in step 1 is the input current, the current waveform is a sine wave, and the terminal voltage waveform is a rectangular wave.

[0035] transmitter coil L The alternating magnetic field generated by 1 passes through the receiving coil. L 2. Receiver coil L 2. An induced electromotive force is generated, forming an alternating current in the circuit. This current flows through the receiving coil. L The current at position 2 is the output current, with a sine wave waveform, while the terminal voltage waveform is a rectangular wave. (Receiver coil) L The output alternating current energy is transmitted to the high-frequency rectifier after passing through the secondary side compensation network, converting the AC energy into DC energy, and finally transmitted to the load. The load can be capacitive, inductive, or resistive, etc.

[0036] As an optional specific example, the transmitting coil L 1 and receiving coil L The inductance values ​​of 2 are the same. Furthermore, the transmitting coil...L 1 and receiving coil L Both are disc-shaped structures, formed around one side of a magnetic alloy disk. They are installed parallel to the solar panel drive mechanism (SADM) and have a preset air gap between them to serve as an energy transfer space. Preferably, the preset air gap is 5mm, which can effectively prevent excess metal from entering the air gap and causing eddy current effects that lead to temperature increases, or cause magnetic effects that cause the system polarization point to deviate, resulting in a decrease in energy transfer power and efficiency.

[0037] As a specific implementation example, the transmitting coil L 1 and receiving coil L 2. Magnetic energy transfer efficiency is load-dependent, with peak efficiency exceeding 98%. (Transmitter coil) L 1 and receiving coil L 2. Total power consumption is approximately 20W. Operating temperature is not lower than -35℃ to +65℃, and storage temperature is not lower than -40℃ to +70℃. Design life is not less than 5 years.

[0038] This example places the primary-side circuitry on the solar panel and the secondary-side circuitry inside the satellite. The SADM retains only the coils, which have high efficiency. This reduces the thermal design stress of the SADM and facilitates engineering implementation.

[0039] like Figure 2 The diagram shows the detection circuit for a satellite SADM wireless power transfer device provided in this example, including: a first MCU, a first current detection circuit, a second current detection circuit, a first voltage detection circuit, a second MCU, a third current detection circuit, a fourth current detection circuit, and a second voltage detection circuit (corresponding to...). Figure 2 The circuit consists of MCU1, current detection 1, current detection 2, voltage detection 1, MCU2, current detection 3, current detection 4, and voltage detection 2. The first MCU is connected to the first current detection circuit, the second current detection circuit, and the first voltage detection circuit. The second MCU is connected to the third current detection circuit, the fourth current detection circuit, and the second voltage detection circuit.

[0040] The first current detection circuit is used to detect the input current of the high-frequency inverter, the first voltage detection circuit is used to detect the input voltage of the high-frequency inverter, and the second current detection circuit is used to detect the current flowing through the transmitting coil. L The first MCU performs closed-loop signal calculations based on the detection data from the first current detection circuit, the second current detection circuit, and the first voltage detection circuit, and outputs a high-frequency control signal to the high-frequency inverter to realize the current of the transmitting coil. L 1. Power closed-loop control and protection function.

[0041] The third current detection circuit is used to detect the flow of runoff through the receiving coil. LThe second current detection circuit is used to detect the output current of the high-frequency rectifier, the second voltage detection circuit is used to detect the output voltage of the high-frequency rectifier, and the second MCU is used to perform signal closed-loop calculation based on the detection data of the third current detection circuit, the third current detection circuit and the second voltage detection circuit, and output high-frequency control signals to the high-frequency rectifier to realize functions such as output voltage closed-loop control, current closed-loop control, overvoltage protection, undervoltage protection and overcurrent protection.

[0042] The above description is only a preferred embodiment of this application and is not intended to limit this application. Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application.

Claims

1. A satellite SADM wireless power transmission device, characterized in that, include: The primary circuit, located outside the satellite module and mounted on the solar panel, is used to receive the DC power output from the solar panel's battery array. U dc And convert it into high-frequency AC power. U ac ; transmitter coil L 1. Installed at the moving end of the solar panel drive mechanism, used to transmit the high-frequency AC power output from the primary circuit. U ac Converted into magnetic energy; Receiver coil L 2. Installed on the fixed end of the solar panel drive mechanism, used to connect the transmitter coil. L 1. The converted magnetic energy is converted into alternating electrical energy; The secondary circuit, located inside the satellite cabin and installed in the satellite's power system, is used to power the receiver coil. L 2. Output alternating electrical energy and convert it into direct current. U out Output to the load.

2. The satellite SADM wireless power transmission device according to claim 1, characterized in that, transmitter coil L 1. Rotate with the same speed and polarity as the solar panel.

3. The satellite SADM wireless power transmission device according to claim 1, characterized in that, transmitter coil L 1 and receiving coil L The inductance values ​​of 2 are the same.

4. The satellite SADM wireless power transmission device according to claim 1, characterized in that, transmitter coil L 1 and receiving coil L Both are disc-shaped structures, formed around one side of a magnetic alloy disc.

5. The satellite SADM wireless power transmission device according to claim 4, characterized in that, transmitter coil L 1 and receiving coil L 2. They are arranged in parallel with a preset air gap between them, which serves as an energy transfer space.

6. The satellite SADM wireless power transmission device according to claim 5, characterized in that, The preset air gap is 5mm.

7. The satellite SADM wireless power transmission device according to claim 1, characterized in that, The primary-side circuit includes a high-frequency inverter and a primary-side compensation network. The secondary-side compensation network and a high-frequency rectifier are also included. One end of the high-frequency inverter is connected to the output of the solar panel's battery array, and the other end is connected to the primary-side compensation network. The primary-side compensation network is connected to the transmitter coil. L 1. One end of the high-frequency rectifier is connected to the secondary-side compensation network, and the other end is connected to the load. The secondary-side compensation network is connected to the receiving coil. L 2. Primary-side compensation networks and secondary-side compensation networks are used to improve power factor and reduce losses.

8. The satellite SADM wireless power transmission device according to claim 7, characterized in that, The primary-side compensation network and the secondary-side compensation network adopt the same LCC topology.

9. A detection circuit for a satellite SADM wireless power transmission device as described in claim 7 or 8, characterized in that, include: The first MCU and the first current detection circuit, the second current detection circuit, and the first voltage detection circuit connected thereto; The second MCU and the third current detection circuit, the fourth current detection circuit, and the second voltage detection circuit connected thereto; The first current detection circuit is used to detect the input current of the high-frequency inverter, the first voltage detection circuit is used to detect the input voltage of the high-frequency inverter, and the second current detection circuit is used to detect the current flowing through the transmitting coil. L The first MCU is used to output a high-frequency control signal to the high-frequency inverter based on the detection data from the first current detection circuit, the second current detection circuit, and the first voltage detection circuit, so as to realize the current of the transmitting coil. L 1. Closed-loop control of electrical energy; The third current detection circuit is used to detect the flow of runoff through the receiving coil. L The second current detection circuit is used to detect the output current of the high-frequency rectifier, the second voltage detection circuit is used to detect the output voltage of the high-frequency rectifier, and the second MCU is used to output a high-frequency control signal to the high-frequency rectifier based on the detection data of the third current detection circuit, the third current detection circuit and the second voltage detection circuit, so as to realize closed-loop control of output voltage and current.

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