Impedance detection device and control method thereof, wireless charging device and electronic equipment
A technology of impedance detection and detection circuit, which is applied in the direction of measuring devices, circuit devices, measuring electrical variables, etc., can solve the problem that the reflection coefficients of incident couplers and reflective couplers are not equal, and the impedance and isolation coefficient of the load to be detected cannot be accurately determined can't reach zero
Pending Publication Date: 2022-02-18
HONOR DEVICE CO LTD
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Problems solved by technology
[0003] In order to improve the energy conversion efficiency of wireless charging technology, it is necessary to perform impedance matching during the energy conversion process. The key to impedance matching is to adjust the impedance matching network after accurately detecting the impedance. The existing impedance detection method generally uses a directional coupler to detect The amplitude and phase of the port are detected, and the detected amplitude and phase are used to replace the amplitude and phase of the detection port to calculate the impedance, but the parameters of the directional coupler cannot reach the ideal state, such as the incident coupler and the reflective coupler. The reflection coefficients are not equal, and the isolation coefficient cannot reach zero, so the detection value measured by the directional coupler is not equal to the actual value of the detection port, and the impedance of the load to be detected cannot be accurately determined
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[0054] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments.
[0055] Hereinafter, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature.
[0056] In addition, in this application, directional terms such as "upper" and "lower" are defined relative to the schematic placement of components in the drawings. It should be understood that these directional terms are relative concepts, and they are used for relative For descriptions and clarifications, it may vary accordin...
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The embodiment of the invention provides an impedance detection device and a control method thereof, a wireless charging device and electronic equipment, relates to the technical field of wireless charging, and can accurately detect the impedance of a to-be-detected load. The impedance detection device comprises a coupling circuit, an amplitude-phase detection circuit and a controller, the coupling circuit is used for coupling and generating an incident wave detection signal and a reflected wave detection signal, and the amplitude-phase detection circuit is used for detecting the phase difference between the generated reflected wave detection signal and the incident wave detection signal, the amplitude of the incident wave detection signal and the amplitude of the reflected wave detection signal. The controller is used for calculating a detection reflection coefficient according to the phase difference, the incident wave detection signal amplitude and the reflected wave detection signal amplitude, then determining an actual reflection coefficient according to the detection reflection coefficient and a predetermined detection error parameter, and calibrating the detection reflection coefficient into the actual reflection coefficient; and the impedance of the load is determined according to the actual reflection coefficient, and the accuracy of impedance detection can be improved.
Description
technical field [0001] The present application relates to the technical field of wireless charging, and in particular to an impedance detection device and a control method thereof, a wireless charging device and electronic equipment. Background technique [0002] Wireless charging technology can enable users to get rid of the dependence on charging cables and realize free charging anytime and anywhere. Different devices can also be charged as long as they meet the same standard, which greatly improves the user experience. [0003] In order to improve the energy conversion efficiency of wireless charging technology, it is necessary to perform impedance matching during the energy conversion process. The key to impedance matching is to adjust the impedance matching network after accurately detecting the impedance. The existing impedance detection method generally uses a directional coupler to detect The amplitude and phase of the port are detected, and the detected amplitude an...
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Login to View More IPC IPC(8): H02J50/12H02J50/80H02J50/50H02J7/02G01R27/02
CPCH02J50/12H02J50/80H02J50/502H02J7/02H02J7/00036G01R27/02
Inventor 姜丕锦李德君江成张新丽
Owner HONOR DEVICE CO LTD