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A direct resonant frequency phase tracking control method for a non-contact power supply device

A non-contact power supply, resonant frequency technology, applied in the direction of circuit devices, battery circuit devices, control/regulation systems, etc., can solve the problem of slow tracking speed, reduce switching loss and voltage and current stress, reduce switching loss and voltage and current stress, improving system efficiency

Active Publication Date: 2021-02-26
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the traditional phase-locked loop resonance frequency tracking method, such as slow tracking speed, and provide a direct resonance frequency phase tracking control method for a non-contact power supply device

Method used

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  • A direct resonant frequency phase tracking control method for a non-contact power supply device
  • A direct resonant frequency phase tracking control method for a non-contact power supply device

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Embodiment Construction

[0027] Below in conjunction with embodiment the present invention is further described.

[0028] like figure 1 As shown, the non-contact power supply device applying the present invention includes a DC power supply Udc, an inverter circuit, a primary transmitting coil Lp, a primary resonance compensation capacitor Cp, a secondary receiving coil Ls, a secondary resonance compensation capacitor Cs, a secondary rectification circuit, a filter Capacitor Cf, load RL, current sensor CT1, zero-crossing comparison circuit C2, and controller. The DC power supply Udc is connected to the DC side port of the inverter circuit. The primary resonant compensation capacitor Cp is connected in series or in parallel with the primary transmitting coil Lp to form a primary resonant circuit. The AC side port of the inverter circuit is connected to the primary resonant tank. There is an air gap between the primary transmitting coil Lp and the secondary receiving coil Ls without contact. The seco...

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Abstract

A direct resonance frequency phase tracking control method of a non-contact power supply device is characterized in that in a non-contact electric energy transmission system, a primary output currentis sampled by a current sensor and then passes a zero-crossing comparison circuit to obtain a current zero-crossing signal, and the signal is input to a pulse capturing module of a controller. The controller calculates an interval based on adjacent current zero-crossing captured time to obtain a resonance period, calculates a time difference between the current zero-crossing captured time and inversion voltage driving pulse signal captured time, carries out closed-loop control, adjusts the frequency and phase of the output voltage, and thus, the frequency of the output voltage tracks the practical resonance frequency of a system, and soft switching is realized. Compared with a traditional method, frequency tracking is faster, loss in the tracking process is low, the structure is simple, the cost is low and the reliability is high.

Description

technical field [0001] The invention relates to a non-contact power supply device and a frequency and phase tracking control method. Background technique [0002] Contactless power supply is a new type of power transmission method. It can be powered without physical connection between the power supply and the load. It has the characteristics of no contact, no wear, no spark, waterproof, dustproof, etc., and it is wireless in personal consumer electronics products. Charging, electric vehicle wireless charging, underwater device power supply, mine equipment power supply, rail transit power supply and other fields have gradually been popularized and applied. [0003] The existing non-contact power supply generally uses the principle of electromagnetic induction. The primary side power supply applies an excitation voltage to the primary transmitting coil to generate an alternating magnetic field in space, and the electric energy coupled and induced by the secondary receiving coi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/02H02J50/12H02M7/5387H02M3/335
CPCY02B70/10
Inventor 殷正刚史黎明潘硕卢娜臧晓艳
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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