Design method of efficient forward parallel wireless power supply system

A system design, wireless power supply technology, applied in the direction of circuits, inductors, electrical components, etc., can solve the problems of reduced coupling strength and reduced efficiency, and achieve the effect of suppressing frequency splitting and ensuring high-efficiency transmission

Active Publication Date: 2019-07-02
HENAN NORMAL UNIV
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Problems solved by technology

For example, the reverse coil is introduced on the resonant coil to offset the strong coupling, which can well suppress the frequency splitting, but the coupling strength of this technology at a longer distance is also reduced, which reduces the efficiency of the system during long-distance transmission.

Method used

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  • Design method of efficient forward parallel wireless power supply system
  • Design method of efficient forward parallel wireless power supply system
  • Design method of efficient forward parallel wireless power supply system

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Embodiment Construction

[0050] The design method of the high-efficiency forward parallel wireless power supply system will be described below with reference to the accompanying drawings.

[0051] figure 1 It is a schematic diagram of the WPT / MRC system structure.

[0052] Such as figure 1 As shown, the WPT / MRC system includes a signal generator, a power amplifier, a transmitting coil (a double forward parallel coil composed of two forward coils), a receiving coil (unidirectional coil), and an adjustable capacitor C 1 and adjustable capacitor C 2 and load.

[0053] figure 2 is the equivalent circuit diagram of the WPT / MRC system.

[0054] Such as figure 2 As shown, the inductances of the two forward coils at the transmitting end are L t 1 and L t 2 , the inductance of the unidirectional coil at the receiving end is L r ;The mutual inductance between the two forward coils is M 12 ; The mutual inductance between the two forward coils and the one-way coil at the receiving end is M 1 (D) an...

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Abstract

The invention discloses a method for designing an efficient forward parallel wireless power supply system and relates to a manufacturing method for freely switching between a bidirectional parallel resonant coil and a single forward resonant coil applied to wireless power transmission. The method mainly solves the problem of low transmission efficiency of the system due to the frequency splitting which occurs when the short-range energy transmission of the wireless power transmission system is performed, and can maintain the transmission efficiency of the system during the long-distance energy transmission. According to the system, a double layer wound transmitter coil is designed, in which a coil with a certain number of turns is wound in the same direction in the inner space of the original single layer in a unidirectional direction so that the outer coil is connected with the inner coil to form a double forward parallel structure wherein their heads are connected and their tails are connected. The internal coil and the external coil are connected by a switch so that the double forward parallel resonant coil and the single forward resonant coil can be switched freely. In close-range energy transmission, the switch is closed, and double forward parallel coil serves as a transmitting coil to suppress the frequency splitting; and in long-distance energy transmission, the switch is disconnected, and the single positive coil serves as a transmitting coil to ensure the transmission efficiency.

Description

technical field [0001] The invention relates to a design method for a high-efficiency forward parallel wireless power supply system. Background technique [0002] In recent years, wireless power transfer via magnetic resonant coupling (WPT / MRC) technology has been developing vigorously, but this technology has not been really popularized in smart devices, one of which is The reason is that the transmission efficiency of the magnetically coupled resonant wireless power transmission system changes drastically with the transmission distance. [0003] The study found that when the wireless power transmission system is at a very short distance, the transmission efficiency of the system reaches the maximum value on both sides of the resonant frequency, that is, the phenomenon of frequency splitting appears; as the distance increases, the phenomenon of frequency splitting gradually disappears. When reaching a certain When the distance is at a certain distance, the transmission eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/12H01F38/14
CPCH01F38/14H02J50/12
Inventor 施艳艳王萌梁洁高伟康
Owner HENAN NORMAL UNIV
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