Device and method for detecting and positioning metal foreign matters of wireless charging system based on rack-shaped differential detection coil assembly

• Main Authors: WANG WENWU, DUAN HONGYU, GUO JUNWEI, YANG FUNING, QI CHAO
• Format: Patent
• Language: Chinese; English
• Published: 28.01.2022
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING; VEHICLES IN GENERAL

The invention discloses a device and a method for detecting and positioning metal foreign matters of a wireless charging system based on a rack-shaped differential detection coil group. The device comprises a double-layer detection coil group, a foreign matter signal conditioning circuit , a digital signal processing and comparing circuit and an upper computer; the double-layer detection coil group comprises two single-layer rack-shaped differential detection coil groups which are orthogonally overlapped up and down, and the single-layer rack-shaped differential detection coil groups are overlapped at any 1/4 position of a transmitting coil; when metal foreign matters exist, mutual inductance is generated ; the foreign matter signal conditioning circuit is used for acquiring a mutual inductance voltage value of each detection coil group and a metal foreign matter; the digital signal processing and comparing circuit is used for converting each mutual inductance voltage value into a digital variable quantity an