公开(公告)号：US20210092808A1

公开(公告)日：2021-03-25

申请号：US16954308

申请日：2018-12-21

Applicant: SIGNIFY HOLDING B.V.

Inventor： ZHI QUAN CHEN ,  XIANHUI ZHANG ,  HAIMIN TAO ,  HUI ZHENG

IPC: H05B45/14 ,  H05B45/357

Abstract: A lighting driver is for receiving an alternating current power supply from a fluorescent lighting ballast. A shunt device is provided for selectively shunting the power supply to implement dimming control. A detector is provided for generating a detection signal and for providing the detection signal to the control circuit to operate the shunt device. The detector has a detection circuit for analyzing a voltage at the driver input and generating 5 the detection signal accordingly, when the voltage is detected. In addition, for situations where the voltage detection does not correctly generate the detection signal, a correction circuit generates the detection signal for a time delay from the end of operating the shunt device. This prevents control stability problems at low dimming levels.

公开(公告)号：US20200236761A1

公开(公告)日：2020-07-23

申请号：US16651103

申请日：2018-09-25

Applicant: SIGNIFY HOLDING B.V.

Inventor： LIANG SHI ,  ADRIANUS JOHANNES STEPHANUS MARIA DE VAAN ,  PIETER JOHANNES STOBBELAAR ,  XIANHUI ZHANG ,  PAUL ROBERT VELDMAN ,  HUI ZHENG ,  GANG WANG

IPC: H05B45/325 ,  H03F3/45 ,  H03F1/56 ,  H03F1/02

Abstract: A control circuit, of a control loop, for a lighting driver. The lighting driver is adapted to controllably connect an electronic ballast to an LED light source or lamp. The control circuit comprises a biasing circuit having an adjustable impedance. A tuning circuit adjusts the impedance of the biasing circuit so as to tune a parameter of a frequency response of the control loop and thereby of the lighting driver.