公开(公告)号：US20240313632A1

公开(公告)日：2024-09-19

申请号：US18447316

申请日：2023-08-10

Applicant: NOVATEK Microelectronics Corp.

Inventor： Ching-Jan CHEN ,  Chieh-Ju TSAI ,  Ching-Yang WU

IPC: H02M1/08 ,  H02M3/157

CPC classification number: H02M1/08 ,  H02M3/157

Abstract: A power converter includes a power stage, a feedback circuit, a ramp generator and a controller. The power stage generates a pulse width modulation signal for forming an output voltage. The controller includes a comparator, a control logic circuit, an on-time generator and an off-time generator. The comparator generates a comparison signal according to a compensation signal from the feedback circuit and a ramp signal from the ramp generator. The control logic circuit generates a first trigger signal according to the comparison signal and an off-time pulse signal. The on-time generator generates a duty signal according to the first trigger signal. The duty signal is transmitted to the power stage for controlling a duty cycle ratio of the pulse width modulation signal. The off-time generator generates the off-time pulse signal according to the duty signal and transmits the off-time pulse signal to the control logic circuit.

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.