-
公开(公告)号：US11658518B2
公开(公告)日：2023-05-23
申请号：US17408824
申请日：2021-08-23
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Baranidharan Karuppusamy , Thet Mon Sann , Kien Beng Tan , Supriya Raveendra Hegde , Huiqiao He , Teerasak Lee
Abstract: A wireless power circuit operable in transceiver mode and in Q-factor measurement mode includes a bridge rectifier having first and second inputs coupled to first and second terminals of a coil, and an output coupled to a rectified node. An excitation circuit coupled to the first terminal, in Q-factor measurement mode, drives the coil with a pulsed signal. A protection circuit couples the first terminal to a first node when in Q-factor measurement mode and decouples the first terminal when in transceiver mode. A controller causes the bridge rectifier to short the first and second terminals to ground during Q-factor measurement mode. A sensing circuit amplifies voltage at the first node to produce an output voltage, and in response to the voltage at the first node rising to cross a rising threshold voltage, digitizes the output voltage. The digitized output voltage is used in calculating a Q-factor of the coil.
-
公开(公告)号：US11387676B2
公开(公告)日：2022-07-12
申请号：US17007225
申请日：2020-08-31
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Eng Jye Ng , Chee Weng Cheong , Huiqiao He
Abstract: A system comprising includes a wireless power receiver generating a rectified voltage. A low dropout regulator (LDO) generates a first regulated output voltage from the rectified voltage, during a first phase. A first switch couples the first regulated output voltage to a voltage output node during the first phase. During a second phase, the LDO generates a second regulated output voltage from the rectified voltage. A switching regulator generates a third regulated output voltage during the second phase. A second switch couples the third regulated output voltage to the voltage output node during the second phase. During a third phase, the LDO is disabled, while the switching regulator continues to generate the third regulated output voltage. The first switch opens during the third phase while the second switch remains closed.
-
公开(公告)号：US11271393B1
公开(公告)日：2022-03-08
申请号：US17007633
申请日：2020-08-31
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Supriya Raveendra Hegde , Yannick Guedon , Huiqiao He
Abstract: A wireless-power-system includes a bridge-rectifier having first and second inputs coupled to first and second terminals of a coil, and an output coupled to a rectified voltage node. An excitation circuit is coupled to the first input. A protection circuit has a first connection node capacitively coupled to the first terminal. The protection circuit, in Q-factor measurement mode, clamps the first connection node when the first input is coupled to ground, and connects the first connection node to the rectified voltage node when the first input is coupled to a supply voltage. The protection circuit, in wireless power mode, is acting as one leg of the rectifier. A pass gate circuit is coupled between the first connection node and a sense node, and a sensing circuit is coupled to the sense node and measures a Q-factor of the wireless power system when the protection circuit is in Q-factor measurement mode.
-
公开(公告)号：US11152822B1
公开(公告)日：2021-10-19
申请号：US17037982
申请日：2020-09-30
Applicant: STMicroelectronics Asia Pacific Pte Ltd
Inventor： Baranidharan Karuppusamy , Thet Mon Sann , Kien Beng Tan , Supriya Raveendra Hegde , Huiqiao He , Teerasak Lee
Abstract: A wireless-power-circuit is operable in transceiver-mode and Q-factor-measurement-mode, and includes a bridge coupled to a coil, and having an output coupled to a rectified-voltage node. An excitation circuit, when in Q-factor-measurement-mode, drives the coil with a pulsed signal. A protection circuit couples the coil to a first node when in Q-factor-measurement-mode and decouples the coil from the first node when in transceiver-mode. A Q-factor sensing circuit includes an amplifier having inputs coupled to the first node and a common mode voltage (Vcm), and generating an output signal having an output voltage. A comparator generates a comparison output indicating Vcm crossing of a voltage at the first terminal of the coil, a processing circuit generating an enable signal based upon the comparison output, and an analog-to-digital-converter, when enabled, digitizing the output voltage for use in calculating a Q-factor of the coil.
-
-
-
Search Results
4
records
(took 0.035 seconds)
