公开(公告)号：US20190013731A1

公开(公告)日：2019-01-10

申请号：US16027004

申请日：2018-07-03

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Giovanni GRITTI

IPC: H02M3/157 ,  H02M3/335 ,  H02M3/158 ,  H02J7/00

Abstract: A control module controls a switching converter including at least one inductor element and one switching element. The module includes: a driver circuit that generates a control signal which controls the on and off cycles of the switching element; a first modulation circuit which sends a command to the driver circuit in such a manner as to generate edges of a first type of the control signal, as a function of the input electrical quantity and of a reference electrical quantity; and a second modulation circuit which sends a command to the driver circuit in such a manner as to generate edges of a second type of the control signal, as a function of a first and a second internal electrical quantity, which are functions respectively of the charges on a first and a second capacitor, which are charged and discharged as a function of the control signal.

公开(公告)号：US20230123235A1

公开(公告)日：2023-04-20

申请号：US17490034

申请日：2021-09-30

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni GRITTI ,  Claudio ADRAGNA

IPC: H05B45/325 ,  H05B45/10 ,  H05B45/397

Abstract: An LED lighting system includes switching circuity adjustably driving a string of LEDs and being controlled by a reference current and an enable signal. A controller generates the reference current and enable signal based upon a PWM signal such that the switching circuitry: sources a first LED current to the string of LEDs that is proportional to a duty cycle of the PWM signal when the duty cycle is greater than a threshold duty cycle to thereby perform analog dimming; and sources a second LED current to the string of LEDs that has a duty cycle proportional to the duty cycle of the PWM signal when the duty cycle of the PWM signal is less than the threshold duty cycle, such that an average LED current delivered to the string of LEDs is proportional to the duty cycle of the PWM signal to thereby perform digital dimming.