Cascade boost-buck converter for impedance matching of wireless power transmission system and control method thereof
A technology of wireless power transmission and step-down converters, applied in the direction of output power conversion devices, collectors, control/regulation systems, etc., can solve the problems of increased number of coils, increased losses, and inability to cope with frequency changes, etc., to solve the problem of transmission The efficiency is not high, the effect of improving the transmission efficiency
Inactive Publication Date: 2021-06-01
XIAN JIAOTONG LIVERPOOL UNIV
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Problems solved by technology
In the matching method of variable coupling coefficient, such as figure 1 As shown, the two-coil structure of the resonant transmission system is transformed into a four-coil structure to achieve impedance matching between the power supply end and the load end, but the corresponding loss increases with the increase in the number of coils, and the overall transmission efficiency of the system is affected.
In the matching method of the embedded capacitor array, the matching network composed of the capacitor array is embedded between the high-frequency power supply and the transmitting coil, and the maximum transmission power theory is used to make the system realize impedance matching. However, this kind of network is only designed for a certain frequency and cannot Coping with Frequency Changes
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[0058] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0059] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a spec...
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The invention discloses a cascade boost-buck converter for impedance matching of a wireless power transmission system and a control method thereof, and relates to the field of circuit control. The cascade boost-buck converter for impedance matching of the wireless power transmission system comprises a Boost converter, a Buck converter, a switching signal control circuit, an input current detection circuit, an input voltage detection circuit, a load current detection circuit and a load voltage detection circuit. A first switching signal control circuit outputs a first PWM signal according to an input current, an input voltage and the optimal load value of the wireless power transmission system so as to control a switching device in the Boost converter; and a second switching signal control circuit outputs a second PWM signal according to the load current and the load voltage so as to control a switching device in the Buck converter. A problem that the transmission efficiency of an existing wireless power transmission system is not high is solved. The effect of improving the transmission efficiency of the wireless power transmission system is achieved.
Description
technical field [0001] The present application relates to the field of circuit control, in particular to a cascaded step-up-down converter for impedance matching of a wireless power transmission system and a control method thereof. Background technique [0002] With the continuous development of electric vehicle charging technology, Magnetic Resonance Coupling Wireless Power Transfer (MCR-WPT) has received more and more attention and research at home and abroad. The system transmission efficiency of the MCR-WPT system is affected by the change of the transmission distance of the system coil or the change of the battery impedance of the electric vehicle battery during charging and discharging. If the MCR-WPT system can maintain the impedance matching state, the transmission efficiency of the MCR-WPT system will be greatly improved. [0003] At present, the most common research methods for impedance matching of the MCR-WPT system are the matching method of variable coupling c...
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Login to View More IPC IPC(8): H02M3/158H02J50/12H02J50/70H02J7/10
CPCH02J7/06H02M3/1582H02J50/12H02J50/70
Inventor 赵中阳刘雯朱昱豪
Owner XIAN JIAOTONG LIVERPOOL UNIV