CPT (contact-less power transfer) system based on static capacitor array and control method thereof

Abstract

The invention discloses a CPT (contact-less power transfer) system based on a static capacitor array and a control method thereof, and belongs to the field of CPT system. In the CPT system, the static capacitor array is additionally arranged on a pick-up end circuit; a resonant inductor Ls on the pick-up end circuit is connected with the static capacitor array in parallel; two ends of load RL areconnected with an input terminal of an AD (analog-to-digital) sampling module through a voltage division circuit; an output terminal of the AD sampling module is connected with an input terminal of acontroller; and an output terminal of the controller is connected with the static capacitor array so as to control the static capacitor array to output different equivalent capacitance values. In thecontrol method of the CPT system, a segmented control method based on a soft-switching technology is provided for adjusting the equivalent capacitance values output by the static capacitor array in alogical operation manner, thereby realizing control of output voltage of the CPT system. The CPT system and the control method thereof have the advantages that the adjustment range of the output voltage of the CPT system is extended, the loss of a dynamic switch is reduced and the overall stability of the system is improved.

Description

technical field [0001] The invention relates to a control method for the output voltage of a CPT system, in particular to a CPT system based on a static capacitance array and a control method thereof. Background technique [0002] Contactless Power Transfer System, referred to as CPT system, is a technology that realizes power transmission by means of high-frequency electromagnetic field. Because it uses magnetic field as a medium to realize power transmission, it gets rid of the actual electrical contact, so that Power supply and receiving equipment has considerable flexibility and safety, and has attracted extensive attention from scholars in recent years. [0003] In the CPT system power supply application of mobile devices, since the power transmitting end and the receiving end are relatively independent, the coupling coefficient between the transmitting end and the receiving end will change dynamically during the movement of the mobile device, resulting in the correspon...

AI Technical Summary

Problems solved by technology

The short-circuit decoupling method achieves energy control by picking up the short circuit of the coil. This method is simple and easy to implement, but in a high-power application environment, due to the large energy loss during the short-circuit process, the system efficiency will decrease.

The primary-side active control method controls the output voltage of the pick-up end by controlling the input voltage of the transmitter end of the system. This method is effective in the single-to-single energy transmission process, but for the case of multiple receivers, independent control of multiple outputs cannot be achieved.

The dynamic capacitor switching method realizes the control of the output voltage by changing the phase of the current flowing through the resonant capacitor, but the resonant voltage waveform is easily distorted due to the dynamic capacitor, resulting in a small adjustment range, which is limited in application.

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