Linear constant current controller

A linear constant current controller technology, applied in lighting devices, light sources, electric light sources, etc., can solve the problems of low efficiency and limited linear constant current controllers, and achieve low cost, high efficiency, good line regulation and load regulation rate effect

Active Publication Date: 2012-01-25
许瑞清
View PDF4 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In fact, the defect of low efficiency is the main reason that limits the application of linear constant current controller

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
  • Linear constant current controller
  • Linear constant current controller
  • Linear constant current controller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] The basic idea of ​​the present invention is to remove the figure 1 In this way, the AC 110V or 220V voltage is only rectified, and VIN is no longer an approximate DC voltage, but a unidirectional pulsating signal of 100 / 120Hz, such as figure 2shown. At this time, the VIN voltage changes continuously from the lowest 0V to the highest 311V (rectified result of 220V alternating current). When the VIN voltage is lower than the forward conduction voltage VLED of the LED load 190, the LED has no current. When the VIN voltage rises higher than the forward voltage VLED of the load 190, the LED current starts to increase until it reaches the maximum current limit. If the VIN voltage continues to increase afterwards, the excess voltage (VIN-VLED) will be borne by the constant current controller, and the power borne by the controller will be P LOSE =(VIN-VLED)*ILED, if ILED remains unchanged, the bigger (VIN-VLED), P LOSE The larger; but as (VIN-VLED) becomes larger and ILED...

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 discloses a linear constant current controller, which comprises a chip of the controller, a driving device and an illuminating lamp. The controller is connected to an input voltage source by a constant current source load. The linear constant current controller is characterized in that: the input voltage source provides one-way pulsating power grid voltage for the voltage rectification of an alternating current power grid. The controller comprises a power grid current control circuit and an error amplification circuit, wherein the power grid current control circuit controls the acquisition of power grid current in a current-gaining window of the one-way pulsating power grid voltage based on a voltage division signal from the input voltage source and an amplified error signal; and the error amplification circuit determines the average current of the power grid current based on a detection signal for the power grid current flowing from the power grid current control circuit, and generates the amplified error signal. The efficiency of the linear constant current controller provided by the invention can be remarkably improved; and the linear constant current controller has relatively lower cost and can achieve a relatively higher line regulation rate and a relatively higher load regulation rate at the same time.

Description

technical field [0001] The present invention relates to a linear constant current controller circuit, in particular to a high-efficiency linear constant current controller for driving a constant current source load, a chip including the controller and a driving device, and a device including the driving device lighting fixtures. Background technique [0002] Due to the characteristics of high luminous efficiency, long life, no radiation and low power consumption, light-emitting diodes (LEDs) are widely used in the lighting industry. As a constant current source load, the LED requires a different controller than a constant voltage source load. At present, there are two main types of controllers for driving LEDs in the industry. One is the switch constant current controller, the main feature is that it needs inductors and transformers, and the efficiency is generally higher under various conditions, but the cost is also high. The other is a linear constant current controlle...

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 许瑞清金红涛李嶷刘立国
Owner 许瑞清
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap