CN-122001103-A - High-efficiency coordination control method for semi-active bridge wireless power supply system

Abstract

The disclosure relates to a high-efficiency coordination control method of a semi-active bridge wireless power supply system, which is used for solving the problem that when a battery load of the semi-active bridge based wireless power supply system changes, the weight of a receiving end is reduced and the high energy transmission efficiency is difficult to be compatible. The method is characterized in that for a wireless power supply system based on a half-active bridge, the conduction angle of a synchronous switch of the half-active bridge is calculated and adjusted at a receiving end And then voltage regulation is carried out at the transmitting end, so that the output voltage can track the reference voltage value when the equivalent load changes, and the requirement of impedance matching at the receiving end is met on the premise that a passive matching network or a cascade DC/DC converter is not required to be additionally added, and the energy transmission efficiency of the wireless power supply system is improved.

Inventors

• XU WENZHENG
• ZHAO XINYI
• WU XUEZHI
• JING LONG

Assignees

• 北京交通大学

Dates

Publication Date

20260508

Application Date

20260108

Claims (9)

1. 1. A high-efficiency coordination control method for a semi-active bridge wireless power supply system is characterized by comprising the following steps of: At the receiving end, the synchronous switch control of the semi-active bridge calculates and adjusts the conduction angle according to the following formula Impedance matching is realized: , is the equivalent load resistance of the battery, For the equivalent reactance of the receiving end, In order to receive the internal resistance of the coil, For the purpose of mutual inductance, the magnetic resonance device is provided with a magnetic resonance device, In order to be of an angular frequency, Is the internal resistance of the transmitting coil; and then voltage regulation is carried out at the transmitting end, so that the output voltage is a constant reference voltage value when the equivalent load changes.
2. 2. The method of claim 1, wherein the conduction angle Before calculation, the load equivalent resistance of the semi-active rectifying circuit is calculated Load equivalent resistance corresponding to maximum transmission efficiency Is corrected for, the efficiency only taking into account coil losses.
3. 3. The method of claim 1, wherein the phase shift angle Before calculation, the output voltage of the semi-active rectifying circuit is calculated And a set reference voltage value The comparison eliminates the error.
4. 4. The method of claim 1, wherein the output voltage of the semi-active rectifying circuit Acquired by a sensor.
5. 5. The method of claim 1, wherein the reference voltage value The setting mode is as follows: 。
6. 6. The method of claim 1, wherein the semi-active bridge is equivalently implemented by full bridge rectification in such a way as to keep the switching tubes on each leg off.
7. 7. The method of claim 1, wherein the voltage regulation regulates the phase shift angle by regulating the phase shift angle to the inverter circuit The realization is as follows: , is the output voltage of the semi-active rectifying circuit, Is the input dc voltage.
8. 8. The method of claim 1, wherein the voltage regulation is achieved by varying the inverter switching frequency from the resonant frequency.
9. 9. A wireless power supply system, characterized in that it is controlled for use by the method according to any one of claims 1-8.

Description

High-efficiency coordination control method for semi-active bridge wireless power supply system Technical Field The disclosure relates to wireless charging technology, in particular to a high-efficiency coordination control method for a semi-active bridge wireless power supply system. Background The wireless power transmission technology is that electric energy is transmitted from a system transmitting end to a receiving end through a loosely coupled magnetic induction coil, and as a load end and a power supply end are not in direct electrical contact, the risk of spark and electric shock is eliminated, and the wireless power transmission technology is safer and more reliable and has been widely applied to the fields of unmanned aerial vehicles, electric vehicles, medical appliances and the like. The unmanned aerial vehicle adopts wireless power supply technology to charge and helps to improve flexibility and convenience of charging, not only can improve the endurance capacity of the unmanned aerial vehicle, but also can promote unmanned and intelligent development of industry, and widens the practical value of the unmanned aerial vehicle in fields such as logistics, inspection, rescue and the like. The unmanned aerial vehicle wireless power supply system also provides high requirements on adjustable output characteristics and high transmission efficiency, and needs to have adjustable output and ensure high transmission efficiency so as to realize quick charging. One of the technical routes for improving the energy transmission efficiency is an impedance matching technology, but the equivalent impedance of a battery can be gradually increased in the charging process, the existing impedance matching technology generally adopts a T-type or pi-type passive matching network or a cascade one-stage direct current-direct current (DC/DC) converter, but the number, the volume and the cost of elements are inevitably increased, however, an unmanned aerial vehicle is sensitive to the weight and the volume of an airborne device, the weight and the volume of the wireless power supply device of an airborne receiving end are reduced, the improvement of the unmanned aerial vehicle endurance mileage and the like is facilitated, and the airborne space is saved. Disclosure of Invention In order to solve all or part of the technical problems and realize the maximum weight reduction of a receiving end on the premise of high energy transmission efficiency, the disclosure provides a high-efficiency coordination control method of a semi-active bridge wireless power supply system, which comprises the steps of firstly calculating and adjusting a conduction angle by pressing synchronous switch control of a semi-active bridge at the receiving endTwo active switching tubes are simultaneously conducted for a period of time before and after the zero crossing point of the coil at the receiving end, and impedance matching is realized on the premise of keeping the pure resistance of the equivalent resistance at the receiving end:, is the equivalent load resistance of the battery, For the equivalent reactance of the receiving end,In order to receive the internal resistance of the coil,For the purpose of mutual inductance, the magnetic resonance device is provided with a magnetic resonance device,In order to be of an angular frequency,And regulating the voltage at the transmitting end to realize the constant reference voltage value of the output voltage when the equivalent load changes, and meeting the requirement of impedance matching at the receiving end and improving the energy transmission efficiency of the wireless power supply system on the premise of not additionally adding a passive matching network or a cascaded DC/DC converter. In one embodiment of the foregoing aspect, the conduction angleBefore calculation, the load equivalent resistance of the semi-active rectifying circuit is calculatedLoad equivalent resistance corresponding to maximum transmission efficiencyIs corrected for, the efficiency only taking into account coil losses. In one embodiment of the foregoing aspect, the phase shift angleBefore calculation, the output voltage of the semi-active rectifying circuit is calculatedAnd a set reference voltage valueThe comparison eliminates the error. In one embodiment of the foregoing aspect, the output voltage of the semi-active rectifying circuitAcquired by a sensor. In one embodiment of the foregoing aspect, the reference voltage valueThe setting mode is as follows:。 in one implementation manner of the above technical solution, the half-active bridge is implemented by full-bridge rectification equivalent, and the equivalent manner is to keep the switching tube on each bridge arm turned off. In one embodiment of the foregoing technical solution, the voltage regulation regulates the phase shift angle of the inverter circuit by regulating and controllingThe realization is as follows:, is the output voltage of the semi-active rectif