Wireless solar energy transmission device based on resonant soft switch

Abstract

The invention discloses a wireless solar energy transmission device based on a resonant soft switch. The wireless solar energy transmission device comprises a transmitting end and a receiving end, the transmitting end comprises an inductor L1 and an inductor L2 which are connected in parallel, an mos transistor S1 and an mos transistor S2 which are connected in parallel, and a capacitor C1 and a capacitor C2 which are connected in parallel at the two ends of the mos transistor S1 and the mos transistor S2, and a transmitting coil LR1, and the mos transistor S1 is connected with the inductor L1; according to the invention, solar energy is transmitted into a satellite in a wireless transmission mode, and the defects that a traditional solar wing electric energy transmission mode cannot rotate by 360 degrees through a power cable, and a slip ring is reliable and short in service life are overcome. And the utilization rate of the illumination angle of the solar wing is increased. The power transmission loss is reduced through technologies such as resonant mode and soft switching, and the energy loss of power transmission is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of satellite power supply systems, and in particular to a wireless solar energy transmission device based on a resonant soft switch. Background Art

[0002] Satellite solar panel power transmission is one of the key technologies in satellite power supply systems. With the rapid development of modern space technology, satellite missions are becoming increasingly diverse, and the power demand is also increasing. As a major means of space energy collection, solar panels provide long-term and stable power support for satellites by converting solar energy into electrical energy.

[0003] Currently, the commonly used satellite solar wing power transmission is the process of using solar panels (commonly called solar wings) to convert solar energy into electrical energy and power the satellite's internal systems. The basic working principle of solar wings is based on the photovoltaic effect: sunlight shines on solar cell materials (such as silicon, gallium arsenide, etc.), generating photocurrent, which is then transmitted to the satellite's internal power management system through a series of control and regulation devices.

[0004] With the continuous expansion of space mission requirements, especially in the fields of high-power communication satellites, remote sensing satellites, space stations, etc., higher requirements are placed on the power transmission capacity of satellite solar panels. At present, the means of power transmission for solar panels are power cables and power slip rings. Power cables have good reliability, but the cables themselves have mechanical rotation angle limitations and cannot be used for 360° rotation of solar panels, which results in the loss of some solar panel power. Power slip rings achieve power transmission through a set of annular conductive tracks and sliding brushes. In the high vacuum, extreme temperature and high radiation space environment of satellites, slip rings need to have good conductivity, wear resistance and high reliability. Slip rings are usually treated with precious metal materials (such as gold and silver) for conductive surface treatment, which brings great difficulties to the cost of satellite manufacturing and the on-orbit operation life. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a wireless solar energy transmission device based on resonant soft switching. The present invention has the function of transmitting solar energy into the star through wireless transmission, avoiding the shortcomings of the traditional solar wing power transmission method that the power cable cannot rotate 360° and the slip ring is less reliable and has a low life span, thereby increasing the utilization rate of the solar wing's illumination angle. The power transmission loss is reduced by resonant and soft switching technologies, which greatly reduces the energy loss of power transmission.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A resonant soft-switch wireless solar energy transmission device comprises a transmitting end and a receiving end; the transmitting end comprises an inductor L1 and an inductor L2 connected in parallel, a MOSFET S1 and a MOSFET S2 connected in parallel, and a capacitor C1 and a capacitor C2 connected in parallel at both ends of the MOSFET S1 and the MOSFET S2, and a transmitting coil LR1, wherein the MOSFET S1 is connected to the inductor L1; one end of the transmitting coil LR1 is connected to the capacitor C1, and the other end is connected to the MOSFET S2 and the capacitor C2 through a capacitor C3; the receiving end converts the AC power of the receiving end into DC power through a rectifier bridge and filters the DC power for use by a load through a capacitor.

[0008] As a further solution of the present invention, the working process includes: MOS tube S1 turns from off to on, and MOS tube S2 turns from on to off, specifically including the following stages: T0-T1 process: current I1 initially flows into MOS tube S1, and current Is1 on MOS tube S1 begins to rise. At this time, MOS tube S2 turns from on to off, and the current flowing into MOS tube S2 is transferred to capacitor C2; T1-T2 stage: load current I0 starts to commutate, part of current I2 flows to capacitor C2, and part flows to the coil; T2-T3 stage: the voltage of capacitor C2 has been charged to a peak value, capacitor C2 begins to discharge, and flows to capacitor C3, transmitting coil LR1 and MOS tube S1.

[0009] As a further solution of the present invention, the working process also includes: MOS tube S1 turns from on to off, and MOS tube S2 turns from off to on, specifically including the following stages, T3-T4 process: MOS tube S1 turns from on to off, and the current flowing into MOS tube S1 is transferred to capacitor C1; T4-T5 stage: load current I0 starts to turn to MOS tube S2;

[0010] T5-T6 stage: capacitor C1 starts to discharge, at this moment I0=I1+IC1, as current I0 continues to rise, the current on MOS tube S2 continues to rise along with current I0.

[0011] As a further solution of the present invention, when MOS tube S1 is turned on and MOS tube S2 is turned off, the resonant circuit is composed of the transmitting coil LR1, the capacitor C3, and the capacitor C2. At this time, the resonant frequency W01 and the quality factor Q1 of the resonant circuit are respectively:

[0012]

[0013] As a further solution of the present invention, when the MOS tube S2 is turned on and the MOS tube S1 is turned off, the resonant circuit is composed of the transmitting coil LR1, the capacitor C3, and the capacitor C1. At this time, the resonant frequency W02 and the quality factor Q2 of the resonant circuit are respectively:

[0014]

[0015] Double e-class inverter selects C1=C2, resonant frequency ω 01 =ω 02 , quality factor Q1=Q2.

[0016] The present invention can realize the function of wirelessly transmitting solar wing electric energy to onboard loads; adopt resonant soft switching technology for solar wireless power transmission to realize efficient transmission of electric energy; use double E inverter to raise the inverter voltage to reduce transmission loss; and use soft switching technology to reduce switching loss on MOS tube.

[0017] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic structural diagram of a wireless solar energy transmission device based on a resonant soft switch according to the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further explained below in conjunction with the accompanying drawings and related knowledge, and described clearly and completely. Obviously, the described application is only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] Reference Figure 1 As shown, the present invention provides a resonant soft-switch wireless solar energy transmission device, including a transmitting end and a receiving end; the transmitting end includes an inductor L1 and an inductor L2 connected in parallel, a MOS tube S1 and a MOS tube S2 connected in parallel, and a capacitor C1 and a capacitor C2 connected in parallel at both ends of the MOS tube S1 and the MOS tube S2, and a transmitting coil LR1, and the MOS tube S1 is connected to the inductor L1; one end of the transmitting coil LR1 is connected to the capacitor C1, and the other end is connected to the MOS tube S2 and the capacitor C2 through the capacitor C3; the receiving end converts the AC power of the receiving end into DC power through a rectifier bridge and filters it for use by the load through a capacitor.

[0021] The soft switch of the present invention is realized as follows: the parallel MOS tubes S1 and S2 and the capacitors C1 and C2 connected in parallel at both ends form a soft switch circuit. When the circuit is working, by controlling the on and off of the MOS tube and utilizing the charging and discharging characteristics of the capacitor, the MOS tube can be switched under zero voltage or zero current conditions, reducing switching losses and improving circuit efficiency; resonant operation: the inductors L1 and L2 and the related capacitors and the transmitting coil LR1 together form a resonant circuit. When the circuit works at the resonant frequency, the energy is periodically exchanged between the inductor and the capacitor, so that the transmitting coil LR1 can generate an alternating magnetic field with a higher efficiency, preparing for wireless energy transmission.

[0022] The receiving end generates an induced electromotive force in the receiving coil by receiving the alternating magnetic field sent by the transmitting end, thereby generating alternating current. The alternating current is then converted into direct current through a rectifier bridge, and then filtered by a capacitor to remove the alternating component in the direct current, making the output direct current smoother and more stable, and finally providing a stable DC power supply for the load.

[0023] The resonant soft switching technology of the present invention can reduce circuit losses, improve the transmission efficiency of electric energy from the transmitting end to the receiving end, and reduce energy loss during the transmission process; the soft switching technology reduces electromagnetic interference and other problems during the switching process, making the circuit operation more stable. At the same time, the resonant circuit operates at the resonant frequency and also has good stability, which can ensure the reliability of wireless energy transmission.

[0024] In a preferred embodiment of the present invention, the working process includes: MOS tube S1 turns from off to on, and MOS tube S2 turns from on to off, specifically including the following stages: T0-T1 process: current I1 initially flows into MOS tube S1, and current Is1 on MOS tube S1 begins to rise. At this time, MOS tube S2 turns from on to off, and the current flowing into MOS tube S2 is transferred to capacitor C2; T1-T2 stage: load current I0 begins to commutate, and part of current I2 flows to capacitor C2, and part flows to the coil; T2-T3 stage: the voltage of capacitor C2 has been charged to the peak value, and capacitor C2 begins to discharge, flowing to capacitor C3, transmitting coil LR1 and MOS tube S1. Among them, when MOS tube S2 is turned on, current flows through S2. In the circuit, the capacitor is charged because there is a potential difference between its two ends. When the MOS tube S2 is turned off and the current turns to C2, the coil current I0 and the other branch current I2 form a potential difference across the capacitor C2, so that the charge can move to the capacitor C2 under the action of the electric field force, thereby charging the capacitor C2 and realizing the storage of electrical energy into electric field energy.

[0025] In the preferred embodiment of the present invention, the working process also includes: MOS tube S1 turns from on to off, and MOS tube S2 turns from off to on, specifically including the following stages, T3-T4 process: MOS tube S1 turns from on to off, and the current flowing into S1 of the MOS tube turns to capacitor C1; T4-T5 stage: load current I0 begins to turn to MOS tube S2; T5-T6 stage: capacitor C1 begins to discharge, at this moment I0=I1+IC1, because current I0 continues to rise, the current on MOS tube S2 continues to rise with current I0. After T4, load current I0 begins to turn to MOS tube S2, because S2 has turned from off to on, providing a new path for load current, and other conditions in the circuit make the load current begin to flow to S2. At this time, the current IS2 of MOS tube S2 consists of two parts, one part is the original current I2, and the other part is the load current I0 that has been turned over, so IS2=I2+I0. As time goes by, I0 increases continuously, and because I1=I0+IC1, and the total current I1 is relatively stable under certain conditions, IC1 decreases continuously. When IC1 decreases to 0, the capacitor C1 reaches its charging limit, and its voltage reaches its peak value.

[0026] In a preferred embodiment of the present invention, when the MOS tube S1 is turned on and the MOS tube S2 is turned off, the resonant circuit is composed of the transmitting coil LR1, the capacitor C3, and the capacitor C2. At this time, the resonant frequency W01 and the quality factor Q1 of the resonant circuit are respectively:

[0027]

[0028] When MOS tube S2 is turned on and MOS tube S1 is turned off, the resonant circuit is composed of the transmitting coil LR1, capacitor C3, and capacitor C1. At this time, the resonant frequency W02 and the quality factor Q2 of the resonant circuit are:

[0029]

[0030] Double e-class inverter selects C1=C2, resonant frequency ω 01 =ω 02 , quality factor Q1=Q2.

[0031] In the present invention, when a high-voltage AC sine wave is generated at the transmitting end, the switching frequency can be adjusted to discharge the capacitor voltage connected in parallel at both ends of the MOS tube to 0 at an appropriate time. At this time, the MOS tube is turned on, and the voltage between the drain and the source of the MOS tube is 0, realizing zero voltage switching, reducing the conduction loss of the MOS tube to 0, reducing the energy loss and device heating in the switching process, and improving the circuit efficiency and reliability; by adjusting the capacitance value of C3, due to the capacitance of the capacitor, changing the capacitance value of C3 can make the reactance of the inductance and the capacitor in the circuit offset each other under the soft switch conduction frequency, and the circuit reaches a resonant state, at which time the impedance of the circuit is minimum and the current is maximum, which is conducive to the efficient transmission of energy. The receiving coil first passes through the power adjustable capacitor, and by changing the capacitance value, the total reactance of the receiving coil circuit can be zero and reach the resonance point. In the resonant state, the receiving coil can receive the energy transmitted from the transmitting end with maximum efficiency, thereby improving the transmission efficiency of the entire wireless transmission system; the receiving coil receives alternating current, and the alternating current can be converted into direct current through a rectifier bridge, and the alternating current whose direction and magnitude change with time can be converted into direct current whose direction remains unchanged. Then, through capacitor filtering, the charging and discharging characteristics of the capacitor are utilized to smooth out the voltage fluctuations in the DC power, providing a stable DC voltage for the load, ensuring that the load can work normally and stably.

[0032] Compared with the traditional solar wing power transmission method, the present invention avoids the shortcomings of the power cable being unable to rotate 360° and the slip ring having low reliability and lifespan, can increase the utilization rate of the light angle of the solar wing, can make the solar panel continuously receive sunlight, and improve the power generation efficiency; by using two resonant coils to generate resonance at the same frequency, the energy efficient transmission is achieved through resonant coupling. In solar wireless transmission, the transmitting end and the receiving end can achieve the best energy transmission state at a specific frequency, reducing the energy loss during the transmission process; when the high-voltage AC sine wave is generated at the transmitting end, the switching frequency is adjusted so that the capacitor voltage connected in parallel at both ends of the MOS tube is discharged to 0 at the appropriate time, and the MOS tube is turned on at this time to achieve zero voltage opening, so that the MOS tube conduction loss is reduced to 0, reducing the energy loss and device heating during the switching process, and improving the circuit efficiency and reliability.

[0033] A specific embodiment is provided below.

[0034] Example 1

[0035] A resonant soft-switch wireless solar energy transmission device comprises a transmitting end and a receiving end; the transmitting end comprises an inductor L1 and an inductor L2 connected in parallel, a MOSFET S1 and a MOSFET S2 connected in parallel, and a capacitor C1 and a capacitor C2 connected in parallel at both ends of the MOSFET S1 and the MOSFET S2, and a transmitting coil LR1, wherein the MOSFET S1 is connected to the inductor L1; one end of the transmitting coil LR1 is connected to the capacitor C1, and the other end is connected to the MOSFET S2 and the capacitor C2 through the capacitor C3; the receiving end converts the AC power of the receiving end into DC power through a rectifier bridge and filters the DC power for use by the load through the capacitor;

[0036] Solar energy transmission device working process

[0037] S1 turns from off to on, S2 turns from on to off

[0038] T0-T1 process: Current I1 initially flows into MOS tube S1, and the current Is1 on the MOS tube begins to rise, that is, IS1 = I1-I0. Since the inductance value selected by L1 is large, that is, I1 is constant, the current I0 flowing to the coil begins to decrease. At this time, MOS tube S2 turns from on to off, and the current flowing into MOS tube S2 turns to flow to C2, that is, coils I0 and I2 charge capacitor C2, and the charging current IC2 = I0 + I2. The voltage on capacitor C2 begins to rise. The load current i0 gradually decreases and reaches zero;

[0039] T1-T2 stage: load current I0 starts to commutate. Part of current I2 flows to C2, and part flows to the coil. At this time, current I0 rises in the opposite direction. Since current I2 is constant, I2=IC2, the current of capacitor C2 decreases continuously until it reaches 0. At this moment, current I2 is all transferred to the load, that is, i0=I2;

[0040] T2-T3 stage: The voltage of capacitor C2 has been charged to the peak value, C2 begins to discharge, flows to C3, LR1, S1, and the voltage on capacitor C2 begins to decrease. At this moment, I0=I2+IC2. As the current I0 continues to rise, the current on MOS tube S1 also continues to rise, and at this moment IS1=I1+I0;

[0041] S1 turns from on to off, S2 turns from off to on

[0042] During T3-T4: MOS tube S1 turns from on to off, and the current flowing into MOS tube S1 turns to flow into C1, that is, coil i0 and I1 charge capacitor C1, charging current I1=I0+IC1, and the voltage on capacitor C1 begins to increase. Load current I0 gradually decreases and reaches zero, at this time I2=IS2;

[0043] T4-T5 stage: load current I0 starts to turn to MOS tube S2, at this time IS2 = I2 + I0, the current of MOS tube S2 continues to increase, at this time switch tube S1 is turned off, I1 = I0 + IC1, I0 continues to increase, IC1 continues to decrease, until it decreases to 0 and the voltage of capacitor C1 reaches its peak;

[0044] T5-T6 stage: capacitor C1 starts to discharge, at this moment I0=I1+IC1. As current I0 continues to rise, the current on MOS tube S2 continues to rise along with current I0, at this moment IS2=I2+I0;

[0045] When the switch tube S1 is turned on and S2 is turned off, the resonant circuit is composed of LR1, C3, and C2. At this time, the resonant frequency W01 and the quality factor Q1 of the resonant circuit are:

[0046] When the switch tube S2 is turned on and S1 is turned off, the resonant circuit is composed of LR1, C3, and C1. At this time, the resonant frequency W02 and the quality factor Q2 of the resonant circuit are:

[0047]

[0048] Double e-class inverter selects C1=C2, resonant frequency ω 01 =ω 02 , quality factor Q1 = Q2;

[0049] In the present invention, during the process of generating a high-voltage AC sine wave at the transmitting end, the switching frequency is adjusted so that the capacitor voltage connected in parallel at both ends of the MOS tube is discharged to 0 and the MOS tube is turned on. At this time, when the MOS tube is turned on, the voltage between the drain and the source is 0, and the corresponding MOS tube conduction loss is reduced to 0, completing the soft-open adjustment. The capacitance reactance value of C3 is adjusted so that the circuit resonant frequency point is at the soft switch conduction frequency. The receiving coil first adjusts the receiving coil circuit to the resonance point through the power adjustable capacitor, and then converts the received AC power into DC power through the rectifier bridge and filters it for the load through the capacitor.

[0050] The present invention realizes the function of wirelessly transmitting solar wing electric energy to onboard loads; adopts resonant soft switching technology for solar wireless power transmission to realize efficient transmission of electric energy; uses a double E inverter to raise the inverter voltage to reduce transmission loss; and uses soft switching technology to reduce switching loss on MOS tubes.

[0051] The present invention has the function of transmitting solar energy into the star through wireless transmission, avoiding the shortcomings of the traditional solar wing power transmission method that the power cable cannot rotate 360 ​​degrees and the slip ring is less reliable and has a low life span, thereby increasing the utilization rate of the solar wing's lighting angle. The power transmission loss is reduced through resonance and soft switching technologies, greatly reducing the energy loss of power transmission.

[0052] The technical principle of the present invention is described above in combination with the specific embodiments, which are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions under the idea of ​​the present invention belong to the protection scope of the present invention. Those skilled in the art can think of other specific implementations of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A wireless solar energy transmission device based on resonant soft switching, characterized in that: It includes a transmitting end and a receiving end; the transmitting end includes an inductor L1 and an inductor L2 connected in parallel, a MOS tube S1 and a MOS tube S2 connected in parallel, and a capacitor C1 and a capacitor C2 connected in parallel at both ends of the MOS tube S1 and the MOS tube S2, and a transmitting coil LR1, and the MOS tube S1 is connected to the inductor L1; one end of the transmitting coil LR1 is connected to the capacitor C1, and the other end is connected to the MOS tube S2 and the capacitor C2 through the capacitor C3; the receiving end converts the AC power of the receiving end into DC power through a rectifier bridge and filters it for use by the load through a capacitor.

2. A resonant soft-switch wireless solar energy transmission device as claimed in claim 1, characterized in that: The working process includes: MOS tube S1 turns from off to on, and MOS tube S2 turns from on to off, which specifically includes the following stages: T0-T1 process: current I1 initially flows into MOS tube S1, and current Is1 on MOS tube S1 begins to rise. At this time, MOS tube S2 turns from on to off, and the current flowing into MOS tube S2 is transferred to capacitor C2; T1-T2 stage: load current I0 begins to commutate, part of current I2 flows to capacitor C2, and part flows to the coil; T2-T3 stage: the voltage of capacitor C2 has been charged to the peak value, capacitor C2 begins to discharge, and flows to capacitor C3, transmitting coil LR1 and MOS tube S1.

3. A resonant soft-switch wireless solar energy transmission device as claimed in claim 2, characterized in that: The working process also includes: MOS tube S1 turns from on to off, and MOS tube S2 turns from off to on, which specifically includes the following stages: T3-T4 process: MOS tube S1 turns from on to off, and the current flowing into MOS tube S1 is transferred to capacitor C1; T4-T5 stage: load current I0 begins to turn to MOS tube S2; T5-T6 stage: capacitor C1 begins to discharge, at this moment I0=I1+IC1, as current I0 continues to rise, the current on MOS tube S2 continues to rise with current I0.

4. A wireless solar energy transmission device based on resonant soft switching as claimed in claim 3, characterized in that: When MOS tube S1 is turned on and MOS tube S2 is turned off, the resonant circuit is composed of the transmitting coil LR1, capacitor C3, and capacitor C2. At this time, the resonant frequency W01 and the quality factor Q1 of the resonant circuit are:

5. A resonant soft-switch wireless solar energy transmission device as claimed in claim 4, characterized in that: When MOS tube S2 is turned on and MOS tube S1 is turned off, the resonant circuit is composed of the transmitting coil LR1, capacitor C3, and capacitor C1. At this time, the resonant frequency W02 and the quality factor Q2 of the resonant circuit are: Double e-class inverter selects C1=C2, resonant frequency ω 01 =ω 02 , quality factor Q1=Q2.

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