公开(公告)号：US11611243B2

公开(公告)日：2023-03-21

申请号：US17451673

申请日：2021-10-21

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

IPC: H02J50/12 ,  H02J50/40 ,  H02J50/60 ,  G01R27/26

Abstract: Object detection for wireless power transmitters and related systems, methods, and devices are disclosed. A controller for a wireless power transmitter is configured to receive a measurement voltage potential responsive to a tank circuit signal at a tank circuit, provide an alternating current (AC) signal to each of the plurality of transmit coils one at a time, and determine at least one of a resonant frequency and a quality factor (Q-factor) of the tank circuit responsive to each selected transmit coil of the plurality of transmit coils. The controller is also configured to select a transmit coil to use to transmit wireless power to a receive coil of a wireless power receiver responsive to the determined at least one of the resonant frequency and the Q-factor for each transmit coil of the plurality of transmit coils.

公开(公告)号：US20220376559A1

公开(公告)日：2022-11-24

申请号：US17664769

申请日：2022-05-24

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

IPC: H02J50/60 ,  H02J50/05 ,  H02J50/12 ,  H02J50/40

Abstract: Object detection in wireless power systems and related system, methods, and devices are disclosed. A controller for a wireless power transmitter includes a measurement voltage potential input terminal and a processing core. The processing core is to determine an average of peak to peak amplitude differences present in sampled measurement voltage potentials for each of the plurality of transmit coils, determine a lowest average of the peak to peak amplitude differences, and select a transmit coil corresponding to the lowest average of the peak to peak amplitude differences to transmit wireless power to a receive coil of a wireless power receiver. A wireless power system includes a tank circuit selectively including any one of a plurality of transmit coils.

公开(公告)号：US11264842B2

公开(公告)日：2022-03-01

申请号：US16949003

申请日：2020-10-08

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar

IPC: H02J50/60 ,  H02J50/12 ,  H02J50/40 ,  G01R27/26

Abstract: Foreign object detection for wireless power transmitters and related systems, methods, and devices are disclosed. A controller for a wireless power transmitter includes a processing core and an analog to digital converter configured to sample at least one of a coil voltage potential and a coil current of a transmit coil. The processing core is configured to determine an expected reference Q-factor value responsive to the at least one of the sampled coil voltage potential and the sampled coil current, and compare the expected reference Q-factor value to a reference Q-factor value received from a wireless power receiver. The processing core is further configured to determine that a foreign object is detected proximate to the transmit coil responsive to a comparison of the expected Q-factor value to the reference Q-factor value received from the wireless power receiver.

公开(公告)号：US11159062B2

公开(公告)日：2021-10-26

申请号：US16863865

申请日：2020-04-30

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

IPC: H02J50/12 ,  H02J50/40 ,  H02J50/60

Abstract: Object detection for wireless power transmitters and related systems, methods, and devices are disclosed. A controller for a wireless power transmitter is configured to receive a measurement voltage potential responsive to a tank circuit signal at a tank circuit, provide an alternating current (AC) signal to each of the plurality of transmit coils one at a time, and determine at least one of a resonant frequency and a quality factor (Q-factor) of the tank circuit responsive to each selected transmit coil of the plurality of transmit coils. The controller is also configured to select a transmit coil to use to transmit wireless power to a receive coil of a wireless power receiver responsive to the determined at least one of the resonant frequency and the Q-factor for each transmit coil of the plurality of transmit coils.

公开(公告)号：US20200381947A1

公开(公告)日：2020-12-03

申请号：US16843726

申请日：2020-04-08

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

IPC: H02J50/12 ,  H02M3/158

Abstract: Systems, methods, and devices related to a converter of a wireless power transmitter are disclosed. A controller for a wireless power transmitter is configured to sample an output voltage potential to produce a digital output voltage potential, determine an error between an output reference voltage potential and the digital output voltage potential, filter the error to determine a filtered error, and apply an adaptive gain to the filtered error to determine a duty cycle control signal. The adaptive gain is determined responsive to a converter input voltage potential of the converter of the wireless power transmitter. The controller is further configured to determine a controller output including buck pulse width modulation (PWM) signals and boost PWM signals based on the duty cycle control signal, the controller output configured to control the converter of the wireless power transmitter.