Control circuit in resonance-type wireless charging system
A wireless charging and control circuit technology, applied in battery circuit devices, circuits, circuit devices, etc., can solve problems such as affecting transmission performance, affecting system transmission performance, and full-bridge operation, achieving cost reduction, precise control, and market benefits. The effect of promotion
Active Publication Date: 2018-11-16
HANGZHOU DIANZI UNIV
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Problems solved by technology
At present, general high-power wireless charging uses a full-bridge inverter circuit to invert DC power into AC power to supply wireless transmission coils. The working status of the full bridge affects the transmission performance of the entire system. At present, most of the control strategies use control chips. Control the work of the full bridge, but it is difficult to make the full bridge work in the soft switching state in this way, thus affecting the transmission performance
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[0022] The technical solutions provided by the present invention will be further described below in conjunction with the accompanying drawings.
[0023] see figure 1 , shows the system block diagram of the resonant wireless charging system provided by the present invention, including a rectification and filtering module, a full-bridge inverter circuit, a drive circuit, a control circuit, a signal feedback unit, a resonant transmitting unit and a resonant receiving unit, wherein the The rectification and filtering module is connected to the mains input, and is used to output DC voltage to provide power for the system;
[0024] The full-bridge inverter circuit is used to invert the DC voltage output by the rectification and filtering module into AC power matching the frequency of the resonant transmitting unit according to the drive signal of the drive circuit;
[0025] The resonant receiving unit and the resonant transmitting unit work in a resonant state, and a magnetic field...
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The present invention discloses a control circuit in a resonance-type wireless charging system. The control circuit is used for outputting control signal(s) to control a drive circuit according to feedback signal(s), and thus the operation of the wireless charging system is controlled. The control circuit comprises an amplitude-limiting and zero-crossing detection circuit, a start and stop circuit, an over-current protection circuit and an arc-extinguishing circuit. The over-current protection circuit and the amplitude-limiting and zero-crossing detection circuit are connected with the feedback signal(s). Compared with the prior art, a series of logic devices are adopted in the control circuit, precise control is realized, the cost is further reduced, and thus the control circuit can facilitate the market promotion of wireless charging technology.
Description
technical field [0001] The invention relates to the field of wireless charging, in particular to a control circuit in a resonant wireless charging system. Background technique [0002] Wireless charging technology, that is, Wireless charging technology, refers to the use of the principle of electromagnetic induction to transmit energy between the charger and the electric device through a magnetic field without the use of electric wires. It is derived from wireless power transmission technology. There are three types: electromagnetic induction coupling wireless charging technology, magnetic coupling resonance wireless charging technology and microwave radiation wireless charging technology. Magnetic coupling resonant wireless charging technology is based on the principle of electromagnetic induction coupling and adds the principle of resonance, that is, energy can be efficiently transferred between two objects with the same resonance frequency. It is similar to the electroma...
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IPC IPC(8): H02J50/12H02J7/00H01H9/54
CPCH01H9/54H02J7/0029H02J7/00304H02J50/12
Inventor 秦会斌吴建锋华咏竹杨胜英秦宏帅
Owner HANGZHOU DIANZI UNIV