公开(公告)号：US20210281120A1

公开(公告)日：2021-09-09

申请号：US16949003

申请日：2020-10-08

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar

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

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：US20250079908A1

公开(公告)日：2025-03-06

申请号：US18432657

申请日：2024-02-05

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

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

Abstract: A wireless power transmitter and methods to: determine a transmitter frequency bandwidth of the wireless power transmitter when no wireless power receiver is inductively coupled with the wireless power transmitter; determine a transmitter-receiver frequency bandwidth when a wireless power receiver is inductively coupled with the wireless power transmitter; compare the transmitter-receiver frequency bandwidth and the transmitter frequency bandwidth; and detect a foreign object near the transmit coil based on the comparison of the transmitter-receiver frequency bandwidth and the transmitter frequency bandwidth.

公开(公告)号：US20230369901A1

公开(公告)日：2023-11-16

申请号：US18316923

申请日：2023-05-12

Applicant: Microchip Technology Incorporated

Inventor： Alex Dumais ,  Santosh Bhandarkar

IPC: H02J50/60 ,  G01R19/25 ,  H02J50/10

CPC classification number: H02J50/60 ,  G01R19/2509 ,  H02J50/10

Abstract: Foreign object detection and related apparatuses, methods, and systems are disclosed. An apparatus includes one or more inductive coils to wirelessly couple with another inductive coil, a series capacitor electrically connected in series with the one or more inductive coils, and a controller to determine a coil current through the one or more inductive coils responsive to a capacitor voltage potential difference across the series capacitor and determine a coil power responsive to the determined coil current and a coil voltage potential difference across the one or more inductive coils.

公开(公告)号：US11791665B2

公开(公告)日：2023-10-17

申请号：US17652731

申请日：2022-02-28

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar

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

CPC classification number: H02J50/60 ,  G01R27/2611 ,  H02J50/12 ,  H02J50/402

Abstract: Foreign object detection for wireless power transmitters and related apparatuses and methods are disclosed. An apparatus includes an analog-to-digital converter to sample at least one of a coil voltage potential and a coil current representation of a transmit coil inductively coupled to a receive coil of a wireless power receiver with a distance between the transmit coil and the receive coil. The apparatus also includes a processing core 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 representation. The expected reference Q-factor value indicates a Q-factor value expected at a predetermined reference wireless power transmitter inductively coupled to the wireless power receiver with a reference distance from a reference transmit coil of the predetermined reference wireless power transmitter to the receive coil of the wireless power receiver.

公开(公告)号：US20220294270A1

公开(公告)日：2022-09-15

申请号：US17652731

申请日：2022-02-28

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 apparatuses and methods are disclosed. An apparatus includes an analog-to-digital converter to sample at least one of a coil voltage potential and a coil current representation of a transmit coil inductively coupled to a receive coil of a wireless power receiver with a distance between the transmit coil and the receive coil. The apparatus also includes a processing core 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 representation. The expected reference Q-factor value indicates a Q-factor value expected at a predetermined reference wireless power transmitter inductively coupled to the wireless power receiver with a reference distance from a reference transmit coil of the predetermined reference wireless power transmitter to the receive coil of the wireless power receiver.

公开(公告)号：US11223232B2

公开(公告)日：2022-01-11

申请号：US16843697

申请日：2020-04-08

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

IPC: H02M1/12 ,  H02J50/10 ,  H02J50/80 ,  H02J50/12 ,  H02M1/08 ,  H02M3/158 ,  H02J50/90

Abstract: Various embodiments relate to digital demodulation for wireless power transmission. A wireless power transmitter includes a transmitter coil and a controller. The transmitter coil is configured to wirelessly couple to a receiver coil of a wireless power receiver to transfer power to the wireless power receiver responsive to a coil current applied to the transmitter coil. The wireless power receiver is configured to modulate at least one electrical condition of the wireless power receiver to modulate the coil current at the transmitter coil. The controller is configured to sample one or more electrical signals of the wireless power transmitter, and digitally demodulate the sampled one or more electrical signals to obtain a communication received from the wireless receiver responsive to the modulation of the at least one electrical condition of the wireless power receiver.

公开(公告)号：US20200381946A1

公开(公告)日：2020-12-03

申请号：US16843697

申请日：2020-04-08

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

IPC: H02J50/12 ,  H02M3/158 ,  H02J50/80

Abstract: Various embodiments relate to digital demodulation for wireless power transmission. A wireless power transmitter includes a transmitter coil and a controller. The transmitter coil is configured to wirelessly couple to a receiver coil of a wireless power receiver to transfer power to the wireless power receiver responsive to a coil current applied to the transmitter coil. The wireless power receiver is configured to modulate at least one electrical condition of the wireless power receiver to modulate the coil current at the transmitter coil. The controller is configured to sample one or more electrical signals of the wireless power transmitter, and digitally demodulate the sampled one or more electrical signals to obtain a communication received from the wireless receiver responsive to the modulation of the at least one electrical condition of the wireless power receiver.

公开(公告)号：US20240364141A1

公开(公告)日：2024-10-31

申请号：US18771498

申请日：2024-07-12

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

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

CPC classification number: 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：US12113371B2

公开(公告)日：2024-10-08

申请号：US18186837

申请日：2023-03-20

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

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

CPC classification number: H02J50/60 ,  G01R27/2611 ,  H02J50/12 ,  H02J50/402

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：US11949335B2

公开(公告)日：2024-04-02

申请号：US17649214

申请日：2022-01-28

Applicant: Microchip Technology Incorporated

Inventor： Santosh Bhandarkar ,  Alex Dumais

IPC: H02J50/10 ,  H02M1/08 ,  H02M3/158 ,  H02J50/12 ,  H02J50/80

CPC classification number: H02M3/1582 ,  H02M1/08 ,  H02J50/10 ,  H02J50/12 ,  H02J50/80

Abstract: Apparatuses and methods related to a converter are disclosed. An apparatus includes a converter and a controller. The converter converts an input voltage potential to an output voltage potential. The input voltage potential and the output voltage potential include direct current (DC) voltage potentials. The controller generates pulse width modulation (PWM) signals responsive to a duty cycle control signal, controls the converter via the PWM signals in a buck mode when the duty cycle control signal is less than a predetermined maximum buck value, and controls the converter via the PWM signals in a cascaded buck-boost mode (CBB mode) when the duty cycle control signal is greater than the predetermined maximum buck value. A duty cycle of at least a portion of the PWM signals transitions linearly with the duty cycle control signal from the buck mode to the CBB mode.