Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Constant-current control method for LED driving input-output low-voltage difference

A technology of LED driving and constant current control, applied in energy-saving control technology, electrical components, etc., can solve the problem of increasing current flowing through the lamp bead

Active Publication Date: 2020-03-06
深圳智芯半导体科技有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a constant current control method of LED drive input and output low pressure difference, which solves the problem of the increase of current flowing through the lamp bead or the flickering of the lamp when the output voltage drop of the lamp bead is close to the input voltage drop. The problem

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Constant-current control method for LED driving input-output low-voltage difference
  • Constant-current control method for LED driving input-output low-voltage difference
  • Constant-current control method for LED driving input-output low-voltage difference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] Such as Figure 1 to Figure 8 As shown, a specific embodiment of the present invention is a constant current control method for LED drive input and output low voltage dropout, including an LED lamp, the LED lamp is electrically connected to a switching power supply drive control chip U1, a MOS turn-on time limiting module and a current detection comparator ; The switching power supply drive control chip U1 detects the current by CS, the MOS turn-on time limit module is provided with a TON limit circuit, and the current detection comparator controls the shutdown of the MOS Q1 by detecting the current in real time and the output stage of the error amplifier EA;

[0032] The constant current control method of LED driver input and output low voltage dropout is as follows:

[0033] a. When the MOS Q1 is turned on, the switching power supply drives the cont...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a constant-current control method for an LED driving input-output low-voltage difference, including an LED lamp, a switching power supply driving control chip U1, an MOS turn-on time limiting module, and a current detection comparator, wherein the switching power supply driving control chip U1 detects a current by a CS, the MOS turn-on time limiting module is provided witha TON limiting circuit, the current detection comparator controls the turning off of an MOS Q1 by detecting the current in real time and by the output stage of an error amplifier EA, the switching power supply can fix the turn-on time of the MOS Q1 when the input and output voltages are close to each other, the error amplifier EA can also adjust the turn-off time of the MOS or adjust the duty cycle of MOS Q1 to achieve a constant current. The constant-current control method effectively solves an increase in current flowing through a lamp bead or the flicking of the lamp bead when an output lamp voltage drop and an input voltage drop are close to each other.

Description

technical field [0001] The invention relates to the technical field of LED lighting, and more specifically refers to a constant current control method for LED drive input and output low pressure drop. Background technique [0002] Existing LEDs are more and more widely used in stage lighting, building lighting and garden lighting because of their advantages such as long service life, energy saving, environmental protection and pure color. Since the current LED DCDC constant current step-down scheme can achieve the purpose of multi-connection lamps, the voltage difference between the input voltage and the output lamp voltage will be very close. At this time, the DCDC will enter a switching state close to 100% duty cycle. The output current will increase significantly, and the internal current detection circuit of the chip is in an abnormal working state, which may easily cause flashing or even burn out the lamp beads. [0003] Currently common average current DCDC step-down ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H05B45/30
CPCY02B20/40
Inventor 方曙谢靖吴东生
Owner 深圳智芯半导体科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com