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

Constant current drive controller and light-emitting diode (LED) constant current drive circuit

A constant current drive and control circuit technology, applied in the direction of lamp circuit layout, electric light source, electrical components, etc., can solve the problems of constant current drive controllers such as many peripheral circuit devices, low circuit reliability, and exposed feedback pins. Achieve the effects of avoiding low reliability, improving circuit integration, and simplifying the structure of peripheral circuits

Active Publication Date: 2013-07-10
SHENZHEN SUNMOON MICROELECTRONICS
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a LED constant current drive circuit, aiming at solving the problem that the primary side feedback flyback LED constant current drive circuit provided by the prior art uses the auxiliary winding of the transformer and the voltage dividing resistor to realize the detection of the degaussing signal, so that its The constant current drive controller has many peripheral circuit devices, and the reliability of the circuit is low due to the exposure of the feedback pin FB

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 drive controller and light-emitting diode (LED) constant current drive circuit
  • Constant current drive controller and light-emitting diode (LED) constant current drive circuit
  • Constant current drive controller and light-emitting diode (LED) constant current drive circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The first embodiment of the present invention provides an LED constant current drive circuit, such as figure 2 As shown, for ease of description, only parts related to Embodiment 1 of the present invention are shown.

[0022] In detail, the LED constant current drive circuit includes a transformer T1, and also includes a switch circuit 2. The voltage input end of the switch circuit 2 is connected to the positive power supply Vin+, and the voltage output end of the switch circuit 2 is connected to the first end of the primary coil of the transformer T1 , The second end of the primary coil of the transformer T1 is connected to the negative terminal Vin- of the power supply, and the switch circuit 2 is used to control whether the primary coil of the transformer T1 is energized or not through the switch state; the constant current drive controller 1 connected to the switch circuit 2; the rectifier filter circuit 3. The input terminal of the rectifier filter circuit 3 is connec...

Embodiment 2

[0025] The second embodiment of the present invention provides an LED constant current drive circuit, such as image 3 As shown, for ease of description, only the parts related to the second embodiment of the present invention are shown. Different from the first embodiment, in the second embodiment, the circuit structures of the capacitive circuit 11, the control circuit 12, the switch circuit 2 and the rectifier filter circuit 3 are refined.

[0026] Specifically, the capacitive circuit 11 may include: a switch tube Q1, the voltage input terminal of the switch tube Q1 serves as the input terminal of the capacitive circuit 11 and is connected to the voltage input terminal of the switch circuit 2, and the voltage output terminal of the switch tube Q1 serves as a capacitive circuit The output terminal of 11 is connected to the input terminal of the control circuit 12, and the capacitance in the capacitive circuit 11 is formed by the source and drain parasitic capacitance of the swit...

Embodiment 3

[0033] The third embodiment of the present invention proposes an LED constant current drive circuit, such as Figure 4 As shown, for ease of description, only parts related to Embodiment 3 of the present invention are shown. Among them, the circuit structures of the control circuit 12, the switch circuit 2 and the rectifier filter circuit 3 are the same as those of the second embodiment, and will not be repeated here.

[0034] Different from the second embodiment, in the third embodiment, the capacitive circuit 11 may include a capacitor C3, one end of the capacitor C3 is used as the input terminal of the capacitive circuit 11 and connected to the voltage input terminal of the switch circuit 2, and the other end of the capacitor C3 is used as a capacitor. The output terminal of the sexual circuit 11 is connected to the input terminal of the control circuit 12.

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 belongs to the field of constant current drive circuit design, and provides a constant current drive controller and a light-emitting diode (LED) constant current drive circuit. The constant current drive controller achieves detection on degaussing time of a primary coil of a transformer through a characteristic that a capacitive circuit isolates direct currents and conducts alternating currents, and then a control circuit in the constant current drive controller achieves control of a switching frequency of a switching circuit according to the obtained degaussing time. Compared with the prior art, the constant current drive controller and the LED constant current drive circuit have the advantages of avoiding utilization of an auxiliary winding and a divider resistor of the transformer, simplifying the structure of a peripheral circuit of the constant current drive controller, improving a integration level of circuits, reducing cost, reducing the area of a system board, and meanwhile avoiding the problem that reliability is poor due to the fact that a feedback pin FB exposes.

Description

Technical field [0001] The invention belongs to the field of constant current drive circuit design, and in particular relates to a constant current drive controller and an LED constant current drive circuit. Background technique [0002] In the primary side feedback flyback LED constant current drive circuit, the feedback signal of the primary coil of the transformer is used to achieve constant current control of the output current. The control principle is: suppose the output voltage of the primary side feedback flyback LED constant current drive circuit is Vout, the output current is Iout, the inductance of the transformer primary coil is Lp, the peak current of the transformer primary coil is Ip, and the circuit operating frequency (That is, the switching frequency of the power tube in the circuit) is f, and the conduction voltage drop of the rectifier diode on the secondary side of the transformer is Vd, then Iout=(Lp×Ip 2 ×f) / [2×(Vout+Vd)]; if the control f / (Vout+Vd) is a fi...

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): H05B37/02
CPCH05B45/3725H05B45/382
Inventor 李照华谢靖林道明赵春波胡乔付凌云
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