Wireless power transmitter and wireless power transmission system
A technology of wireless power transmission and wireless power, which is applied in the field of foreign object detection, can solve the problems such as the detection accuracy needs to be improved, and achieve high precision and simple effect
Active Publication Date: 2019-09-24
ACEINNA TRANSDUCER SYST CO LTD
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Problems solved by technology
There are a variety of foreign object detection schemes in the prior art, for example, by detecting the difference between the power sent by the transmitter and the power received by the receiver to determine whether there is a foreign object, and for example, the reduction of the Q factor can be measured to determine whether there is a foreign object, however The detection accuracy of these methods needs to be improved
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[0017] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] The term "one embodiment" or "embodiment" here refers to that specific features, structures or characteristics related to the embodiment can be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification do not necessarily all refer to the same embodiment, nor do they necessarily refer to a separate or selected embodiment that is mutually exclusive of other embodiments. "Multiple" and "several" in the present invention mean two or more. "And / or" in the present invention means "and" or "or".
[0019] A typical wireless power transfer system (such as figure 1 ) contains 2 essential parts: wireless power transmitter TX and wireless power rec...
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The invention discloses a wireless power transmission system and a wireless power transmitter. The wireless power transmitter comprises a transmitting circuit module, a transmitting coil and a foreign object detection module, wherein the transmitting circuit module is connected with an input power supply; the transmitting coil is electrically connected with the transmitting circuit module; the foreign object detection module includes a current sensor and a foreign object detection unit, the current sensor is used for detecting the current on an input end of the transmitting circuit module and obtaining a current sensing signal, and the foreign object detection unit confirms whether there is a foreign object or not based on the current sensing signal. According to the invention, whether there is a foreign object or not is determined through detecting the size of the current on the input end of the transmitting circuit module, the precision is high, and the implementation is simple.
Description
【Technical field】 [0001] The invention relates to foreign matter detection in a wireless power transmission system, in particular to a wireless power transmitter and a wireless power transmission system using an improved foreign matter detection scheme. 【Background technique】 [0002] At present, wireless power transmission systems have been widely used. Power transfer by magnetic induction is a well-known concept, mainly applied to systems with magnetically coupled primary transmitter coils and secondary receiver coils. By separating the primary transmitter inductor and secondary receiver coil between the two devices, wireless power transfer between these becomes possible based on the principle of magnetic coupling. [0003] Such an arrangement allows for wireless power transfer to the device without requiring any wires or physical electrical connections to be made. In fact, it may simply allow the device to be placed near or on the transmitter for external recharging or ...
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IPC IPC(8): H02J50/10H02J50/12H02J50/60H01F38/14
CPCH01F38/14H02J50/10H02J50/12H02J50/60
Inventor 章赛军
Owner ACEINNA TRANSDUCER SYST CO LTD