Wireless electric energy transmission device with controllable transmission power and method
A technology for wireless power transmission and power transmission, applied in circuit devices, electrical components, electromagnetic wave systems, etc., can solve the problems of high requirements for real-time high-speed processing capabilities of chips, and achieve the effect of simple structure and low cost
Inactive Publication Date: 2013-05-01
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
However, the implementation of this control strategy in the control circuit needs to rely on expensive digital programmable control chips, which require high real-time high-speed processing capabilities of the chip.
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[0022] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0023] like figure 1 As shown, the present invention includes a square wave generator, a digital controller, a drive circuit, a first switch tube, a second switch tube, and a magnetically coupled resonant circuit; wherein the magnetically coupled resonant circuit includes a transmitting circuit and a receiving circuit, and the transmitting circuit is powered by a DC power supply V1, the switching tube Q1, the transmitting coil L1, and the transmitting coil resonant capacitor C1 are formed. The receiving circuit is the receiving coil L2, the receiving coil resonant capacitor C2 and the load. The inductance L1 of the transmitting coil is the same as the inductance L2 of the receiving coil, and the resonant capacitances C1 and C2 are the same.
[0024] The square wave generator generates a high-frequency switching signal and transmits it to the driv...
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The invention discloses a wireless electric energy transmission device with controllable transmission power, and the device comprises a square wave generator, a digital controller, a driving circuit, a first switching tube, a second switching tube and a magnetic coupling resonant circuit, wherein the square wave generator generates a high-frequency switching signal and transmits the same to the driving circuit; after receiving the high-frequency switching signal, the driving circuit drives the first switching tube which is connected with the magnetic coupling resonant circuit to be connected, and transmits the electric energy to a load in a wireless way through the magnetic coupling resonant circuit; the digital controller transmits a duty ratio control signal to the second switching tube, so as to disconnect and connect the second switching tube cyclically, indirectly control the working cycle of the magnetic coupling resonant circuit and control the wireless electric energy transmission power. The invention also discloses a control method of the transmission device, and the method comprises the following steps that the oscillation quantity of a transmission resonance magnetic field within one cycle is defined; and the average power of the load is controlled by adjusting the duty ratio within one cycle.
Description
technical field [0001] The present invention relates to a wireless energy transmission device, in particular to a magnetic coupling resonance device and a transmission power duty ratio control method thereof, which are used to provide adjustable power for a receiving end load. Background technique [0002] As a new type of wireless power supply technology, non-radiative magnetic coupling resonance produces strong mutual coupling between two resonant objects of the same frequency, while only weakly couples to the receiving end of the surrounding non-resonant frequency. The magnetically coupled resonant system includes a transmitting resonant coil, a secondary receiving resonant coil and a load. Magnetic coupling resonance technology can achieve mid-range energy transmission without increasing the magnetic field strength, while traditional magnetic coupling can only achieve relatively good results within a short distance (generally within ten centimeters). It can only be incr...
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IPC IPC(8): H02J17/00H02J50/12
Inventor 周岩刘赟吕小妹谢俊岳东
Owner NANJING UNIV OF POSTS & TELECOMM