Efficiency collaborative optimization system for wireless power transmission of port shore power

Abstract

The invention discloses an efficiency collaborative optimization system for wireless power transmission of port shore power, comprising a coupling mechanism follower module, a constant frequency control module and a heat dissipation module. The coupling mechanism follower module comprises a position adaptive servo unit, a mobile unit and a fixed unit. The position adaptive servo unit comprises a shore-based end and a ship-based end. The shore-based end is provided with a transmitter, and the ship-based end is provided with a receiver. The transmitter and the receiver realize energy transmission through an electromagnetic coupling mechanism. The mobile unit transports the transmitter and couples and docks with the receiver. The fixed unit is used to fix the relative position of the transmitter and the receiver. The constant frequency control module comprises a phase-controlled inductor circuit to dynamically tune the system circuit. The heat dissipation module is used to dissipate heat from the system. The heat dissipation module comprises a synchronous rectification circuit to improve the power density of the converter in the circuit. The invention optimizes wireless charging from three aspects of structural fixation, circuit frequency and heat dissipation, thereby improving charging efficiency and stability.

Description

Technical Field

[0001] The invention belongs to the technical field of ship wireless power transmission, in particular to an efficiency collaborative optimization system for port shore power wireless power transmission. Background Art

[0002] The ship's shore power charging device is designed to ensure that all electrical equipment on the ship can work normally when the ship is sailing at sea. Currently, most systems use low-voltage power supply. Because of its high power quality, relatively easy to implement technology, and low cost, it has become the first choice for most domestic ship shore power supply systems.

[0003] However, when using wireless charging, the charging efficiency needs to be considered. The charging efficiency is mainly affected by the following aspects: 1. Due to the existence of waves, the receiving end keeps shaking, so the relative position of the receiving end and the power supply end will continue to change, affecting the charging stability and reducing the charging efficiency; 2. The efficiency of the wireless power transmission system is greatly affected by the frequency. Changes in the resonance parameters will cause detuning and thus reduce the system transmission efficiency; 3. High-power wireless charging has large heat dissipation losses.

[0004] Therefore, it is necessary to study how to ensure efficient, stable and efficient wireless charging. Summary of the invention

[0005] The purpose of the present invention is to provide an efficiency collaborative optimization system for port shore power wireless power transmission, which optimizes wireless charging from three aspects: structural fixation, circuit frequency, and heat dissipation, thereby improving charging efficiency and stability.

[0006] The present invention provides an efficiency collaborative optimization system for wireless power transmission of port shore power. The technical solution for solving the technical problem includes a coupling mechanism follow-up module, a constant frequency control module, and a heat dissipation module. The coupling mechanism follow-up module includes a position adaptive servo unit, a mobile unit, and a fixed unit. The position adaptive servo unit includes a shore-based end and a ship-based end. The shore-based end is provided with a transmitter, and the ship-based end is provided with a receiver. The transmitter and the receiver realize energy transmission through an electromagnetic coupling mechanism. The mobile unit transports the transmitter and couples and docks with the receiver. The fixed unit is used to fix the relative position of the transmitter and the receiver; the constant frequency control module includes a phase-controlled inductor circuit to dynamically tune the system circuit; the heat dissipation module is used to dissipate heat for the system, and the heat dissipation module includes a synchronous rectification circuit to improve the power density of the converter in the circuit.

[0007] Preferably, the shore-based end includes a PLC, a servo drive, a servo motor, and a monitoring system. The servo controller and the monitoring system are uniformly controlled by the PLC, and the servo motor and the servo drive communicate with each other via an encoder.

[0008] Preferably, the monitoring system can detect relative position information and power control information of the transmitter and receiver.

[0009] Preferably, the shore-based end includes a grid power supply, a primary power conversion circuit, a resonant compensation circuit, and a transmitter connected in sequence, and the ship end includes a receiver, a resonant compensation circuit, a secondary power conversion circuit, and a load connected in sequence.

[0010] Preferably, the phase-controlled inductor circuit is composed of a capacitor with a fixed capacity and an inductor connected in series with a bidirectional thyristor.

[0011] Preferably, the synchronous rectification circuit adopts an LCC type two-stage topology structure.

[0012] Preferably, the moving unit includes a three-axis motor and a manipulator, and the fixing unit includes an electromagnet arranged on a transmitting coil and a receiving coil.

[0013] Preferably, the fixing unit includes a first telescopic plate, a second telescopic plate, and a fixing rod, the transmitter includes a transmitting body, and the receiver includes a receiving body, both sides of the transmitting body are respectively provided with a first telescopic plate that can be extended to both sides, and both sides of the receiving body are respectively provided with a second telescopic plate that can be extended to both sides, each of the first telescopic plate and the second telescopic plate is provided with a fixing hole, and the first telescopic plate and the second telescopic plate on the same side are fixedly connected by a fixing rod passing through the fixing hole.

[0014] In summary, the technical solution of the present invention has at least the following beneficial effects:

[0015] 1. By using the magnetic field coupling effect for wireless charging, the workload of charging is reduced and the charging efficiency is improved;

[0016] 2. By designing a coupling mechanism follow-up module, the connection and fixation of the transmitting coil and the receiving coil can be facilitated, thereby improving the stability and efficiency of power transmission;

[0017] 3. By designing a constant frequency control module, the frequency of the original secondary circuit can be kept synchronized to ensure the maximum transmission efficiency of wireless power transmission;

[0018] 4. By designing a heat dissipation module, the heat dissipation effect can be improved, the transmission efficiency can be improved, and energy waste can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of 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 creative work.

[0020] Figure 1 It is a schematic diagram of the position adaptive servo unit of the present invention;

[0021] Figure 2 The phase-controlled inductor circuit of the present invention;

[0022] Figure 3 is a curve diagram showing the change of the imaginary part of the equivalent impedance with the equivalent inductance of the present invention;

[0023] Figure 4 It is the principle diagram of synchronous rectification of the present invention;

[0024] Figure 5 It is a working waveform diagram of the synchronous rectification circuit of the present invention;

[0025] Figure 6 This is a schematic diagram of the shore-based end and the ship-based end of the present invention;

[0026] Figure 7 It is a schematic diagram of one embodiment of the fixing unit of the present invention.

[0027] In the figure: 1. reflector; 2. receiver; 3. grid power supply; 4. primary power conversion circuit; 5. resonance compensation circuit; 6. secondary power conversion circuit; 7. first telescopic plate; 8. second telescopic plate; 9. fixing rod. DETAILED DESCRIPTION

[0028] 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.

[0029] The present invention provides a system for optimizing the efficiency of wireless power transmission in port shore power supply, such as Figure 1-7 As shown, it includes a coupling mechanism follower module, which is used to achieve the docking of the transmitter and the receiver and keep them relatively fixed; a constant frequency control module, which is used to ensure the frequency of the primary circuit and the secondary circuit so that the two work at the same frequency; and a heat dissipation module, which improves the heat dissipation efficiency by selecting suitable heat dissipation materials and adopting reasonable circuit design.

[0030] The coupling mechanism follow-up module includes a position adaptive servo unit, a mobile unit and a fixed unit. The position adaptive servo unit includes a shore-based end and a ship-based end. The shore-based end is provided with a transmitter, and the ship-based end is provided with a receiver. The transmitter and the receiver realize energy transmission through an electromagnetic coupling mechanism. The mobile unit transports the transmitter and couples and docks with the receiver. The fixed unit is used to fix the relative position of the transmitter and the receiver. The shore-based end includes a PLC, a servo drive, a servo motor, and a monitoring system. The servo controller and the monitoring system are uniformly controlled by the PLC. The servo motor and the servo drive communicate through an encoder. The shore-based end also includes a grid power supply, a primary power conversion circuit, a resonant compensation circuit, and a transmitter connected in sequence. The ship-based end includes a receiver, a resonant compensation circuit, a secondary power conversion circuit, and a load connected in sequence. The monitoring system can detect the relative position information of the transmitter and the receiver. By monitoring the information, it can be known that the mobile unit accurately docks the transmitter and the receiver. In the present invention, the mobile unit includes a three-axis motor and a manipulator, which cooperates with the fixing unit to fix the transmitter and the receiver. In the present invention, the fixing unit includes the following two embodiments; first, it includes an electromagnet arranged on the transmitting coil and the receiving coil. After the two are docked, the electromagnet is energized to realize the magnetic fixation of the two; this method is easy to operate, and the fixing and loosening operations of the two can be remotely controlled by turning on and off the power; second, the fixing unit includes a first telescopic plate, a second telescopic plate, and a fixing rod, the transmitter includes a transmitting body, and the receiver includes a receiving body. The two sides of the transmitting body are respectively provided with a first telescopic plate that can extend to both sides, and the two sides of the receiving body are respectively provided with a second telescopic plate that can extend to both sides, each of the first telescopic plate and the second telescopic plate is provided with a fixing hole, and the first telescopic plate and the second telescopic plate on the same side are fixedly connected by a fixing rod passing through the fixing hole; in this embodiment, a mechanical structure is used to fix the transmitter and the receiver, and this method is reliable in fixing, can be adjusted according to actual conditions, and has better stability.

[0031] The constant frequency control module of the present invention includes a phase-controlled inductor circuit, which dynamically tunes the system circuit. Figure 2 As shown, the phase-controlled inductor circuit consists of a capacitor of fixed capacity and an inductor connected in series with a bidirectional thyristor; the phase shift control of the inductor current is achieved by turning the thyristor on and off, so that the entire parallel branch can be continuously adjusted from the capacitive to the inductive range.

[0032] The equivalent inductance of this parallel circuit is:

[0033]

[0034] when When L eq =L t, the switch switches at the peak voltage, which is the same as the natural commutation moment of the inductor; when α=π, L eq =∞, the switch on time is zero, and the inductor is in an open circuit state. The equivalent impedance of the parallel circuit is:

[0035] See attached Figure 3 , the curve of the imaginary part of equivalent impedance changing with the equivalent inductance; From the above figure, it can be seen that by controlling the trigger angle α, Z eq It changes continuously between inductance and capacitance. Therefore, this method can realize dynamic tuning of the circuit and keep the operating frequency of the system stable.

[0036] The heat dissipation module is used to dissipate heat from the system. The heat dissipation module includes a synchronous rectification circuit, which is used to improve the power density of the converter in the circuit. The synchronous rectification circuit adopts an LCC type two-stage topology structure. The LCC type two-stage structure uses a T-type compensation network to optimize the output voltage-current ratio of the system, so that the inverter works in a high duty cycle state, reduces harmonic components, and improves efficiency. At the receiving end, in order to improve the power density and efficiency of the system, it is necessary to avoid using a DC / DC converter. This project intends to adopt an alternative solution for synchronous rectification, such as the attached Figure 4 As shown, the uncontrolled rectifier diode is replaced by a switch tube, and the output characteristics are adjusted by controlling the driving signal of each switch tube.

[0037] In order to further improve the heat dissipation effect, the present invention can be implemented in the following manner during actual use: first, improve the simulation model of the power conversion module based on the new device under the high temperature weak convection environment, establish the thermal circuit model inside the power module, and explore the relevant laws of the steady-state and transient temperature field distribution of the power module.

[0038] Secondly, based on the accurate simulation model of the power conversion module based on the new device, the influence mechanism of temperature on the power conversion module based on the new device is studied, and then the changes in the performance of the power module in the whole temperature range are depicted, and the temperature impact evaluation system of the power conversion module based on the new device is established.

[0039] Furthermore, non-invasive means are used to monitor the temperature field and temperature rise in real time, and online numerical estimation of the thermal radiation behavior of key power components and magnetic elements is performed; with the help of the loss-temperature effect model and real-time heat distribution, the heat source operating point is reasonably adjusted to alleviate the heat dissipation pressure of the power module under extreme working conditions, improve the system performance, and realize active temperature control.

[0040] Finally, thermal simulation methods and temperature measurement means are used to accurately depict the potential differences in heat distribution between internal areas of the power conversion unit. Combined with advanced heat dissipation materials and structures, the gradient is further optimized on the basis of active thermal regulation to compensate for the short board effect caused by uneven heat distribution and ensure efficient and stable operation of the conversion module.

[0041] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. The efficiency collaborative optimization system of port shore power wireless power transmission is characterized by: It includes a coupling mechanism follow-up module, a constant frequency control module, and a heat dissipation module. The coupling mechanism follow-up module includes a position adaptive servo unit, a mobile unit, and a fixed unit. The position adaptive servo unit includes a shore-based end and a ship-based end. The shore-based end is provided with a transmitter, and the ship-based end is provided with a receiver. The transmitter and the receiver realize energy transmission through an electromagnetic coupling mechanism. The mobile unit transports the transmitter and couples and docks with the receiver. The fixed unit is used to fix the relative position of the transmitter and the receiver. The constant frequency control module includes a phase-controlled inductor circuit to dynamically tune the system circuit. The heat dissipation module is used to dissipate heat for the system. The invention comprises a synchronous rectification circuit for improving the power density of the converter in the circuit, wherein the phase-controlled inductance circuit is composed of a capacitor of fixed capacity and an inductance connected in series with a bidirectional thyristor; the fixing unit comprises a first telescopic plate, a second telescopic plate, and a fixing rod; the transmitter comprises a transmitting body; the receiver comprises a receiving body; two sides of the transmitting body are respectively provided with a first telescopic plate that can be extended to both sides; two sides of the receiving body are respectively provided with a second telescopic plate that can be extended to both sides; each of the first telescopic plate and the second telescopic plate is provided with a fixing hole; the first telescopic plate and the second telescopic plate on the same side are fixedly connected by a fixing rod passing through the fixing hole.

2. The efficiency collaborative optimization system for port shore power wireless power transmission according to claim 1 is characterized in that: The shore-based end includes a PLC, a servo drive, a servo motor, and a monitoring system. The servo drive and the monitoring system are uniformly controlled by the PLC, and the servo motor communicates with the servo drive via an encoder.

3. The efficiency collaborative optimization system for port shore power wireless power transmission according to claim 2 is characterized in that: The monitoring system can detect the relative position information and power control information of the transmitter and the receiver.

4. The efficiency collaborative optimization system for port shore power wireless power transmission according to claim 1 is characterized in that: The shore-based end includes a grid power supply, a primary power conversion circuit, a resonance compensation circuit, and a transmitter connected in sequence, and the ship end includes a receiver, a resonance compensation circuit, a secondary power conversion circuit, and a load connected in sequence.

5. The efficiency collaborative optimization system for port shore power wireless power transmission according to claim 4 is characterized in that: The synchronous rectification circuit adopts an LCC type two-stage topology structure.

6. The efficiency collaborative optimization system for port shore power wireless power transmission according to claim 1 is characterized in that: The moving unit includes a three-axis motor and a manipulator, and the fixing unit also includes an electromagnet arranged on a transmitting coil and a receiving coil.

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