A Dynamic Tuning Method for Frequency Tracking of Transmitter of Wireless Power Transmission Equipment
A technology of wireless power transmission and frequency tracking, applied in the direction of circuit devices, electrical components, etc., can solve the problems of inability to realize stepless precise tuning, measurement error of inverter voltage, increase of circuit complexity, etc., and achieve easy promotion, precise tuning, Inexpensive effect
Active Publication Date: 2018-10-23
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
However, since the capacitor array can only work on a limited number of discrete capacitance value points, the adjustment range is limited, and continuous stepless precise tuning cannot be achieved.
At the same time, frequency tracking algorithms are also used to track the resonant frequency, but most of the existing frequency tracking algorithms use hardware circuits to measure the phase difference between the inverter voltage and current, and then perform frequency tracking control of the inverter, but due to noise, etc. The influence of factors will lead to errors in the phase difference measurement of inverter voltage and current, which will not easily make the device in a resonant state, and increase the complexity of the circuit and the cost is high
Method used
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specific Embodiment approach
[0024] A specific embodiment of the present invention is a dynamic tuning method for frequency tracking of a transmitting end of a wireless power transmission device, comprising the following steps:
[0025] A. Initially, the controller sets the rated frequency of the inverter to the current frequency f 0 , and the controller controls the operating frequency of the inverter to be the current frequency f 0 ;
[0026] B. The controller receives the effective value I of the power supply current at the current frequency on the DC side of the sending end D0 , while receiving the effective value of the sending coil current I at the current frequency A0 , and then calculate the ratio η of the coil current to the power supply current at the current frequency 0 ,
[0027] C. The controller will set the current frequency f 0 Add the set frequency adjustment amount Δf to get the maximum frequency f 1 , f 1 =f 0 +Δf, the controller controls the operating frequency of the inverte...
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The invention discloses a dynamic tuning method for frequency tracking of a sending end of a wireless energy transmission device. This method dynamically tracks the resonant frequency of the sending end circuit by using the principle that the ratio of the effective value of the sending coil current to the effective value of the sending end DC side power supply current is the smallest when the sending end circuit resonates, that is, by continuously fine-tuning the operating frequency of the inverter to track the sending end The ratio of the current effective value of the coil to the effective value of the DC side power supply current at the transmitting end makes the current ratio be at the minimum value in real time and dynamically, so as to realize frequency tracking dynamic tuning, so that the transmitting end circuit is at or close to a state of complete resonance, so as to improve the transmission end The active power of the circuit, thereby improving the transmission power and efficiency of the wireless power transmission device. Moreover, the complexity of the circuit is low, the implementation cost is low, and it is easy to popularize.
Description
technical field [0001] The invention relates to a dynamic tuning method for frequency tracking of a sending end of a wireless energy transmission device. Background technique [0002] Wireless power transmission technology is an emerging power transmission technology with a wide range of applications, such as electric vehicles, medical equipment, lighting, underwater detection and so on. Wireless power transmission technology has greatly improved the power supply flexibility of electrical equipment, and at the same time avoided the problems of sparks and wear in traditional contact power supply methods, and improved the safety of power supply for equipment, so it has great development potential. [0003] Compared with other wireless power transmission technologies, inductive wireless power transmission technology can better perform short-distance high-power transmission, and has better development and application prospects. The inductive wireless power transmission device c...
Claims
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IPC IPC(8): H02J50/12
Inventor 麦瑞坤徐丹露杨鸣凯李研玲何正友
Owner SOUTHWEST JIAOTONG UNIV