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Method and apparatus for limiting current overshoot and undershoot in a lamp driver

A driver and microcontroller technology, applied in the field of drivers, can solve the problems of flickering, LED light flashing, etc.

Active Publication Date: 2016-04-06
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can cause an overshoot of the driver output current causing the LED light output to flash and flicker

Method used

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  • Method and apparatus for limiting current overshoot and undershoot in a lamp driver
  • Method and apparatus for limiting current overshoot and undershoot in a lamp driver
  • Method and apparatus for limiting current overshoot and undershoot in a lamp driver

Examples

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Embodiment Construction

[0031] refer to figure 1 , in one embodiment, a block diagram of an LED driver 100 is depicted. Mains input voltage (mains) 101 is connected to the primary side 120 of the LED driver 100 . The primary side 102 of the LED driver 100 is coupled to the primary side of the isolation transformer 102 . The secondary side of the isolation transformer 102 is coupled to the secondary side 130 of the LED driver 100 . Primary side driver power supply 140 is connected to primary side 120 and provides a regulated voltage Primary_PS (power supply) to integrated circuits (ICs) and other peripheral circuits of primary side 120 via switch 14 . The primary side driver supply 140 is connected to the bus voltage V within the primary side 120 as will be described later. bus . Primary side driver power supply 140 is also connected to the primary side of isolation transformer 103 . The secondary side driver power supply 150 is connected to the secondary side of the isolation transformer 103 . ...

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Abstract

A lamp driver having: a primary side driver configured to convert an input from a mains supply to a primary side output; and a secondary side driver coupled to the primary side driver and configured to rectify and filter the primary side output to provide a The output current of the driver used to drive the lamp load. The microcontroller controls the lamp driver at start-up such that during the soft-start period the secondary-side driver is powered up and the primary-side driver is unpowered, and after the soft-start period the primary-side driver is powered-up set to The low output state is then set to a state such that the driver output current of the secondary side driver increases the light output from the lamp load from the initial dimming level to the nominal dimming level without flicker.

Description

technical field [0001] The present invention generally relates to drivers for lighting devices. More specifically, various inventive methods and apparatus disclosed herein relate to limiting current overshoot and current undershoot in a lamp driver during turn-on, turn-off, or during regulation conditions. Background technique [0002] Digital lighting technology, ie illumination based on semiconductor light sources such as light emitting diodes (LEDs), offers a viable alternative to traditional fluorescent, HID and incandescent lamps. Functional advantages and benefits of LEDs include high energy conversion and optical efficiency, durability, lower operating costs, and many others. Recent developments in LED technology have provided efficient and robust spectral lighting sources that enable a variety of lighting effects in many applications. During various conditions, such as start-up, brownout or shutdown, the output current in the LED driver may overshoot causing flicke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/14H05B45/395H05B45/39Y02B20/30H05B45/355
Inventor 陈益民N·希拉斯A·特里帕西K·阿查雅R·N·哈里施戈帕拉皮莱
Owner SIGNIFY HLDG BV