Unlock instant, AI-driven research and patent intelligence for your innovation.

Square wave current falling edge oscillation suppression topological structure of series diode

A topology and diode technology, applied in the direction of electrical components, etc., can solve the problems of converter loss increase, efficiency decrease, damping resistance size dependence, etc., and achieve the effect of small conduction voltage drop, reduced loss, and convenient application

Inactive Publication Date: 2020-11-03
TIANJIN UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the PWM shunt dimming mode, when the dimming switch short-circuits the LED instantaneously, the falling edge of the LED current oscillates due to the influence of the parasitic inductance of the connecting wire and the LED junction capacitance.
The traditional method is to connect the LED in series with the damping resistor R r , to suppress oscillation by increasing the damping of the system, but the size of the damping resistance depends on the parasitic parameters, but the measurement of parasitic parameters is generally troublesome
In addition, when the LED current is too large, the voltage drop on the damping resistor is too large, resulting in an increase in the loss of the converter and a decrease in efficiency

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
  • Square wave current falling edge oscillation suppression topological structure of series diode
  • Square wave current falling edge oscillation suppression topological structure of series diode
  • Square wave current falling edge oscillation suppression topological structure of series diode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0017] The present invention provides a square wave current falling edge oscillation suppression topology of series diodes, which includes dimming switch tubes Q and LEDs connected in parallel, and the internal circuit of the LEDs is equivalent to a reference voltage source V connected in series. D , equivalent resistance R d and LED junction capacitance C J ; There is an ideal diode D in series in the equivalent circuit inside the LED f , the ideal diode is connected in parallel with the ideal diode junction capacitance C Df .

[0018] The following embodiments will firstly explain the reason for current falling edge oscillation in the PWM shunt dimming mode with reference to the...

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 square wave current falling edge oscillation suppression topological structure of a series diode. The structure comprises a dimming switch tube and an LED which are connectedin parallel, and is characterized in that an internal circuit of the LED is equivalent to a reference voltage source, an equivalent resistor and an LED junction capacitor which are connected in series; an ideal diode is connected in series in the internal equivalent circuit of the LED, an ideal diode junction capacitor is connected in parallel on the ideal diode, and a line parasitic inductor also exists in a circuit of the dimming switch tube and the LED.

Description

technical field [0001] The invention relates to the field of square wave current falling edge oscillation, in particular to a square wave current falling edge oscillation suppressing topology of series diodes. It is not necessary to measure the specific value of the parasitic parameter, and the oscillation of the falling edge of the current can be suppressed. It has the characteristics of convenient, simple and extensive application. Background technique [0002] As a new generation of lighting source, LED has the characteristics of long life, small size, high brightness and zero pollution. LED dimming technology has also received extensive attention from scholars at home and abroad. In order to improve the reliability of the dimming converter and improve the linearity of dimming, it is more and more important to suppress the current oscillation. At the same time, the requirements for the conversion efficiency of the converter are getting higher and higher. Therefore, it...

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): H05B45/325
CPCH05B45/325
Inventor 王议锋吴啸尘程鹏宇韩富强陈梦颖刘瑞欣
Owner TIANJIN UNIV