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

Light emitting diode (LED) drive circuit and LED lighting device

A LED drive and circuit technology, applied in lighting devices, electric lamp circuit layout, electric light source, etc., can solve the problems of high cost and complex circuit structure, and achieve the effect of solving high cost, complex circuit structure and reducing circuit cost

Active Publication Date: 2012-10-10
SHENZHEN SUNMOON MICROELECTRONICS
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an LED drive circuit, aiming to solve the problems of complex circuit structure and high cost in the prior art under the premise of ensuring high power factor and constant current output

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
  • Light emitting diode (LED) drive circuit and LED lighting device
  • Light emitting diode (LED) drive circuit and LED lighting device
  • Light emitting diode (LED) drive circuit and LED lighting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] figure 1 The module structure of the LED driving circuit provided by the first embodiment of the present invention is shown. For the convenience of description, only the parts related to the present invention are shown, and the details are as follows:

[0018] The LED drive circuit 100 is connected with the rectifier bridge circuit 200 and the LED load 300, and the rectifier bridge circuit 200 converts the mains AC signal V ac Converted into a sine half-wave electrical signal V I , the input end of the LED load 300 is connected to the output end of the rectifier bridge circuit 200, and the LED drive circuit 100 includes:

[0019] The power factor control module 101 is connected with the output terminal of the rectifier bridge circuit 200, and is used for the sine half-wave electric signal V outputted by the rectifier bridge circuit 200 I are sampled and correspondingly generate a half-sine wave electrical signal with V I The first in-phase electrical signal in the sa...

Embodiment 2

[0024] figure 2 An example circuit structure of the LED driving circuit provided by the second embodiment of the present invention is shown. For the convenience of description, only the parts related to the present invention are shown, and the details are as follows:

[0025] In this embodiment, the LEDs inside the LED load 300 may be connected in series, in parallel or in combination.

[0026] As an embodiment of the present invention, the power module 103 includes:

[0027] N-channel J-type field effect transistor J1, diode D1, resistor R4 and diode D2;

[0028] The gate and drain of the N-channel J-type field effect transistor J1 are connected to the output terminal of the rectifier bridge circuit 200, and the anode and cathode of the diode D1 are respectively connected to the source of the N-channel J-type field effect transistor J1 and the resistor R4. The first end is connected, the second end of the resistor R4 is connected to the cathode of the diode D2, and the ano...

Embodiment 3

[0053] image 3 An example circuit structure of the LED driving circuit provided by the third embodiment of the present invention is shown. For the convenience of description, only the parts related to the present invention are shown, and the details are as follows:

[0054] In this embodiment, the LEDs in the LED load 300 are connected in series, wherein the output terminal of the LED lamp group 301 is the internal circuit node P1 of the LED load 300; the circuit structure of the power module 103 is the same as that provided by the second embodiment of the present invention consistent, so no further details are given.

[0055] As an embodiment of the present invention, the power factor control module 101 includes:

[0056] Resistor R5, resistor R6, comparator U2, resistor R7, comparator U3, resistor R8, resistor R9 and bandgap reference voltage source 1011;

[0057] The first terminal of the resistor R5 is connected to the output terminal of the rectifier bridge circuit 200...

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 is applicable to the field of light emitting diode (LED) drive, and provides an LED drive circuit and an LED lighting device. The LED drive circuit comprises a power factor control module and a constant-current control module. The power factor control module samples a half-sinusoid electric signal outputted by a rectifier bridge circuit, generates a control signal and outputs the control signal to the constant-current control module; the constant-current control module realizes constant-current control over an LED load and ensures a high power factor; and moreover, inductive elements and a power-factor correction circuit which comprises an impulse modulator are not required, so circuit cost is reduced, and problems of complicated circuit structure and high cost in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of LED driving, and in particular relates to an LED driving circuit and an LED lighting device. Background technique [0002] At present, as a new type of light source, LED has been widely used in various fields due to its advantages of low energy consumption, high brightness and long life. The LED driving circuits provided in the prior art for driving LEDs mainly adopt AC-DC isolated driving mode or DC-DC non-isolated driving mode. [0003] However, inductive components such as transformers and inductors are required in the circuit structure adopted by the above two driving methods, and in order to improve the power factor, it is necessary to increase the power of the pulse modulator on the basis of the existing constant current control circuit. The factor correction circuit makes the entire circuit structure more complex, which is not conducive to the miniaturization of LED lamps, and increases the circuit cost. T...

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 Applications(China)
IPC IPC(8): H05B37/02
Inventor 赵春波李照华林道明谢靖付凌云
Owner SHENZHEN SUNMOON MICROELECTRONICS
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