公开(公告)号：US20210168915A1

公开(公告)日：2021-06-03

申请号：US17172953

申请日：2021-02-10

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Wei-Jen LAI ,  Neng-Chieh HSU ,  Zhen-Guo DING ,  Kang-Fan YEH

IPC: H05B45/325

Abstract: An LED controller is used with a video source and at least one LED unit, and includes a control signal generator and a driver. The control signal generator performs pulse width modulation based on a first clock signal, a second clock signal and a data signal, which is generated by the video source, to generate at least one control signal. The first and second clock signals are independent of a vertical synchronization signal that is generated by the video source. The driver generates, based on the at least one control signal, at least one drive signal that is related to light emission of the at least one LED unit.

公开(公告)号：US20210084725A1

公开(公告)日：2021-03-18

申请号：US16902472

申请日：2020-06-16

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Wei-Jen LAI ,  Neng-Chieh HSU ,  Zhen-Guo DING ,  Kang-Fan YEH

IPC: H05B45/325

Abstract: An LED controller is used with a video source and at least one LED unit, and includes a control signal generator and a driver. The control signal generator performs pulse width modulation based on a first clock signal, a second clock signal and a data signal, which is generated by the video source, to generate at least one control signal. The first and second clock signals are independent of a vertical synchronization signal that is generated by the video source. The driver generates, based on the at least one control signal, at least one drive signal that is related to light emission of the at least one LED unit.

公开(公告)号：US20220271662A1

公开(公告)日：2022-08-25

申请号：US17646481

申请日：2021-12-30

Applicant: NOVATEK Microelectronics Corp.

Inventor： Chieh-Ju TSAI ,  Ching-Jan CHEN ,  Zhen-Guo DING ,  Zhe-Hui LIN ,  Wei-Ling CHEN

IPC: H02M3/158 ,  H02M1/00

Abstract: A power stage circuit generates an output signal according to an input signal and a control signal. A ramp generator circuit generates a ramp signal according to the control signal, the input signal, and the output signal. A calculation circuit generates a calculation signal according to the output signal and a reference signal. The calculation circuit operates in a first mode when the power converter operates in a light loading state, and the calculation circuit operates in a second mode when the power converter operates in a normal state. A control circuit generates the control signal according to the calculation signal and the ramp signal. The control circuit includes a comparator circuit and a control signal generator. The comparator circuit generates a comparison signal according to the calculation signal and the ramp signal. The control signal generator generates the control signal according to the comparison signal.

公开(公告)号：US20220271661A1

公开(公告)日：2022-08-25

申请号：US17646478

申请日：2021-12-29

Applicant: NOVATEK Microelectronics Corp.

Inventor： Chieh-Ju TSAI ,  Ching-Jan CHEN ,  Zhen-Guo DING ,  Zhe-Hui LIN ,  Wei-Ling CHEN

IPC: H02M3/158 ,  H02M3/157

Abstract: A power converter includes a power stage circuit, a ramp generator circuit, and a control circuit. The power stage circuit is configured to generate an output signal according to an input signal and a control signal. The ramp generator circuit is configured to generate a ramp signal according to the control signal, the input signal, and the output signal. The control circuit is configured to generate the control signal according to the output signal, a reference signal, and the ramp signal.