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

led drive circuit

A technology of LED drive and drive circuit, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve problems such as flickering, impractical feasibility, dimming of output light, and achieve the effect of improving input response speed

Active Publication Date: 2017-05-03
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some linear chips have added over-power and over-temperature protection. The principle is to protect the chip by reducing the output current of the LED, which also causes the output light to dim or flicker.
So this simple linear drive method is not practical

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
  • led drive circuit
  • led drive circuit
  • led drive circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0017] The LED driving circuit of the present invention includes an AC input stage, an output terminal of the driving circuit, an output voltage feedback terminal, a control loop for controlling the duty cycle of the power tube switch according to the output voltage feedback terminal, and a power tube connected to the control loop; It includes a first reference voltage, an LDO, an adjusting tube connected between the power tube and the load LED, and a CS sampling resistor connected between the power tube and the adjusting tube, the control end of the adjusting tube is connected to the output end of the LDO, and the The two input terminals of the LDO are respectively connected to the common terminal of the adjustment tube and the CS sampling resistor RCS and the first reference voltage; the common terminal of the power tube and the CS...

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 provides an LED driving circuit which comprises an alternating-current input stage, an output end, an output voltage feedback end, a control loop, a power tube, first reference voltage, an LDO and an adjusting tube. The control loop controls the on-off duty ratio of the power tube according to the output voltage feedback end. The power tube is connected with the control loop. The adjusting tube is connected between the power tube and a load LED. Two input ends of the LDO are connected with a public end of the adjusting tube and the load LED, and the first reference voltage respectively. The LED driving circuit further comprises an output capacitor connected with the output end. The public end of the adjusting tube and the load LED serves as the output voltage feedback end. The control loop comprises an alternating-current sampling circuit. A switched capacitor circuit and the linear constant-current LDO are combined so that the LDO can achieve ripple-wave-free constant currents for the LED and feed back the output voltage to the switched capacitor circuit, energy can be transmitted according to needs, direct sampling of input voltage is achieved by adopting the alternating-current sampling circuit, and the input response speed is increased.

Description

technical field [0001] The invention belongs to the field of integrated circuit design and relates to a switching power supply, in particular to an LED driving circuit. Background technique [0002] With the development of high-voltage LED lamp beads and the increasingly stringent requirements for cost and volume of LED drive power supplies, the low-cost high-voltage constant-current linear drive method has achieved certain technical updates and applications in the past few years. However, the current linear drive method always has low reliability, requires high matching of input voltage and output lamp beads, and cannot withstand large fluctuations in input and output voltages, which hinders the linear drive method from being used in mass production and safety applications of LED lighting. middle. [0003] figure 1 The common flicker-free linear drive methods currently on the market are given. 20 is a constant current linear driver chip, the power supply of the chip is p...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 易坤赵方麟陈雪松
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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