公开(公告)号：US20210091598A1

公开(公告)日：2021-03-25

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

IPC: H02J50/10 ,  H02J7/02 ,  H02M1/36 ,  H02M1/08

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：US20150256330A1

公开(公告)日：2015-09-10

申请号：US14199510

申请日：2014-03-06

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Leonard Liviu DINU ,  Chee Weng CHEONG

IPC: H04L7/033 ,  G06F3/0354 ,  H04L7/00 ,  G06F3/041

CPC classification number: G06F3/03545 ,  G06F3/041 ,  G06F3/0416 ,  G06F3/044 ,  G06F2203/0384 ,  H03L7/00

Abstract: A system and method for compensating for detected phase errors during communications between synchronized devices. In an embodiment, the two devices may be a touch screen device and a synchronized stylus device. To this end, the touch screen device includes a controller configured to receive data signals from the stylus at specific time intervals. The touch screen device generates an internal control signal for receiving the incoming data signals at an expected frequency. The touch screen device further includes circuitry for measuring differences in the time a data signal is actually received against when the data signal was expected to be received and determines a time difference (e.g., a phase error). Then, the internal control signal may be adjusted to compensate for the accumulated phase error. Such a measurement and compensation helps ensure that communications remain in synchronization without having to reestablish synchronization through a cumbersome synchronization process.

Abstract translation: 用于补偿同步设备之间通信期间检测到的相位误差的系统和方法。 在一个实施例中，两个设备可以是触摸屏设备和同步的触笔设备。 为此，触摸屏设备包括被配置为以特定时间间隔从触控笔接收数据信号的控制器。 触摸屏设备产生用于以预期频率接收输入数据信号的内部控制信号。 触摸屏设备还包括用于测量当数据信号被预期接收时实际接收数据信号的时间差异并确定时间差（例如，相位误差）的电路。 然后，可以调整内部控制信号以补偿累积的相位误差。 这样的测量和补偿有助于确保通信保持同步，而无需通过繁琐的同步过程重新建立同步。

公开(公告)号：US20210091597A1

公开(公告)日：2021-03-25

申请号：US17004689

申请日：2020-08-27

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Supriya Raveendra HEGDE ,  Chee Weng CHEONG

IPC: H02J50/10 ,  H02J50/27 ,  H02J50/40

Abstract: A wireless power receiving circuit includes a transistor based rectifier receiving an AC input voltage, and control logic receiving an overvoltage signal. The control logic generates control signals for controlling turn on of transistors within the transistor based rectifier based upon the overvoltage signal so as to cause the transistor based rectifier to produce a rectified output voltage from the AC input voltage. A comparator compares the rectified output voltage to a reference voltage and asserts the overvoltage signal if the rectified output voltage is greater than the reference voltage. In response to assertion of the overvoltage signal, the control logic asserts the control signals to simultaneously turn on all transistors of the transistor based rectifier.

公开(公告)号：US20150256329A1

公开(公告)日：2015-09-10

申请号：US14199210

申请日：2014-03-06

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Chee Weng CHEONG ,  Leonard Liviu DINU ,  Dianbo GUO ,  Kien Beng TAN

IPC: H04L7/033 ,  G06F3/0354 ,  H04L7/00 ,  G06F3/041

CPC classification number: G06F3/03545 ,  G06F3/038 ,  G06F3/041 ,  G06F3/0416 ,  G06F2203/0384 ,  H04L2027/0097

Abstract: A system and method for synchronizing two devices in communication with each other. When communication between the two devices is to be established, a synchronization process may be invoked. In an embodiment, a first device may initiate sending synchronization signals having rising edge and falling edge pairs. The second device may include a controller configured to receive the synchronization signals. However, noise may inhibit the ability of the controller to correctly receive and/or interpret the synchronization signals. Noise may cause detection components to falsely detect noise as a synchronization signal or may cause detection components to miss detection of an actual synchronization signal. A window generator may be used to generate comparison windows for the controller to detect synchronization signals. Further, the detection window duration and start times may be adjusted based on previously detected (or undetected) synchronization signals in order to compensate for noise overshadowing synchronization signals.

Abstract translation: 一种用于同步彼此通信的两个设备的系统和方法。 当要建立两个设备之间的通信时，可以调用同步过程。 在一个实施例中，第一设备可以启动发送具有上升沿和下降沿对的同步信号。 第二设备可以包括被配置为接收同步信号的控制器。 然而，噪声可能会阻碍控制器正确接收和/或解释同步信号的能力。 噪声可能导致检测部件误检测噪声作为同步信号，或者可能导致检测部件错过实际同步信号的检测。 可以使用窗口生成器来生成用于控制器的比较窗口以检测同步信号。 此外，可以基于先前检测到的（或未检测到的）同步信号来调整检测窗口持续时间和开始时间，以便补偿遮挡同步信号的噪声。

公开(公告)号：US20230099911A1

公开(公告)日：2023-03-30

申请号：US17490437

申请日：2021-09-30

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Chee Weng CHEONG ,  Kien Beng TAN

IPC: H02J50/10 ,  H02M7/219 ,  H02M3/156 ,  H02M1/00 ,  G01R19/165 ,  H03K17/687 ,  H02J7/04 ,  H02J50/90

Abstract: A wireless power receiver includes a rectifier with first and second inputs coupled to first and second terminals of a receiver coil, and having a first output coupled to ground and a second output at which a rectified voltage is produced. A first switch is coupled between the second input and ground, and is controlled by a first gate voltage generated at a first node. A second switch is coupled between the first node and ground, and is controlled by a second gate voltage. The first gate voltage closes the first switch to couple the second input to ground when the rectified voltage is less than a threshold voltage, boosting the rectified voltage. The second gate voltage closes the second switch to cause the second gate voltage to be pulled to ground when the rectified voltage is greater than the threshold voltage, limiting the boosting of the rectified voltage.

公开(公告)号：US20180232071A1

公开(公告)日：2018-08-16

申请号：US15953017

申请日：2018-04-13

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Chee Weng CHEONG ,  Leonard Liviu DINU ,  Dianbo GUO ,  Kien Beng TAN

IPC: G06F3/0354 ,  G06F3/041 ,  G06F3/038 ,  H04L27/00

CPC classification number: G06F3/03545 ,  G06F3/038 ,  G06F3/041 ,  G06F3/0416 ,  G06F2203/0384 ,  H04L2027/0097

Abstract: A system and method for synchronizing two devices in communication with each other. When communication between the two devices is to be established, a synchronization process may be invoked. In an embodiment, a first device may initiate sending synchronization signals having rising edge and falling edge pairs. The second device may include a controller configured to receive the synchronization signals. However, noise may inhibit the ability of the controller to correctly receive and/or interpret the synchronization signals. Noise may cause detection components to falsely detect noise as a synchronization signal or may cause detection components to miss detection of an actual synchronization signal. A window generator may be used to generate comparison windows for the controller to detect synchronization signals. Further, the detection window duration and start times may be adjusted based on previously detected (or undetected) synchronization signals in order to compensate for noise overshadowing synchronization signals.