A current loop feedback compensation control circuit with variable gain

A control circuit and feedback compensation technology, applied in the field of LED dimmable constant current power supply, can solve problems such as LED flicker, and achieve the effect of increasing the hiccup frequency, reducing impedance, and avoiding LED flickering

Active Publication Date: 2018-12-18
深圳茂硕电子科技有限公司
View PDF11 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 current loop feedback compensation control circuit with variable gain. Problems causing LEDs to flicker

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
  • A current loop feedback compensation control circuit with variable gain
  • A current loop feedback compensation control circuit with variable gain
  • A current loop feedback compensation control circuit with variable gain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] In order to make those skilled in the art more clearly understand the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Such as figure 2 As shown, in one embodiment of the present invention, the current loop feedback compensation control circuit for the variable gain of the dimmable LED constant current power supply includes an operational amplifier, a feedback network 40, a reference Vref unit 10, a dimming signal ADJ, A sampling current unit 20 , a variable gain control unit 30 , an isolation unit 50 and a pulse width modulation control unit 60 . The input terminal of the reference Vref unit 10 is connected to the dimming signal ADJ, the output terminal of the reference Vref unit 10 is connected to the non-inverting input terminal of the operational amplifier, and the reference voltage generated by the reference Vref unit 1...

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 current loop feedback compensation control circuit with variable gain, the control circuit is used for dimmable LED constant current power supply, the control circuit includes an operational amplifier, feedback network, reference Vref cell, Dimming Signal ADJ, sampling current unit, variable gain control unit, an isolation unit and a pulse width modulation control unit, the output end of the operational amplifier is connected with the pulse width modulation control unit through an isolation unit, the input terminal of the reference Vref unit is connected with a dimming signal ADJ, the output terminal of the reference Vref unit is connected with the non-inverting input terminal of the operational amplifier, the reference voltage generated by the reference Vref unitis used as the non-inverting input terminal voltage of the operational amplifier, The feedback network is connected between the output terminal and the inverting input terminal of the operational amplifier, and the inverting input terminal of the operational amplifier is respectively connected with the sampling current unit and the variable gain control unit, and the variable gain control unit isalso connected with the dimming signal ADJ.

Description

technical field [0001] The invention relates to the technical field of LED adjustable light constant current power supply, in particular to a variable gain current loop feedback compensation control circuit. Background technique [0002] In the application of dimmable LED constant current power supply, LED power supply usually has (0~10V / PWM signal) dimming control function and constant current output function. [0003] Dimming control function: The LED power supply is designed with a control chip, and the dimming line is drawn out at the output end. When the dimming line is connected to 0-10V dimming, the output current of the power supply is changed through the change of the 0-10V voltage or the duty cycle to perform dimming. For example: when the 0-10V dimmer is adjusted to 1V, the current drops to 10%, when the 0-10V dimmer is adjusted to a maximum of 10V, the output current will also reach 100% of the power output, and the brightness will also reach 100% (The output vo...

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 & AuthorityApplications(China)
IPC IPC(8): H05B33/08H03K7/08H05B44/00
CPCH03K7/08H05B45/00
Inventor邓茗键邓勇丁华王华轶张杨王畅刘建铨
Owner深圳茂硕电子科技有限公司