Crest factor overcurrent protection circuit applied to electronic ballast

An overcurrent protection circuit and electronic ballast technology, applied in the direction of overcurrent protection, electric light source, electrical components, etc., can solve the problems of unresonant inductor overcurrent protection, different resonance network parameters, etc., to eliminate The change of resistance value with temperature and MOSFET fluctuation, the effect of realizing accuracy and reliability, and extending the service life

Active Publication Date: 2010-11-10
拓尔微电子股份有限公司
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for the same electronic ballast, the type of fluorescent lamp is different, the corresponding resonant network parameters are different, and the maximum current that different resonant inductors can bear is different, so it is impossible to realize overcurrent protection for resonant inductors

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
  • Crest factor overcurrent protection circuit applied to electronic ballast
  • Crest factor overcurrent protection circuit applied to electronic ballast
  • Crest factor overcurrent protection circuit applied to electronic ballast

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] For convenience of description, a structural block diagram of the present invention applied in an electronic ballast is given, as figure 1 shown. The electronic ballast chip is externally connected with high-end and low-end drive tubes MHS and MLS, and is connected to the resonant network through the drive tube. The resonant network includes resonant inductor L, resonant capacitor C P , DC blocking capacitor C s and fluorescent lighting. The crest factor overcurrent protection circuit of the present invention is connected in the electronic ballast chip, and its input end is connected with the common end VS of MHS and MLS, and collects the current of the resonant inductance. If overcurrent occurs, the crest factor overcurrent protection circuit outputs a crest factor overcurrent protection signal CFP. The CFP signal generates...

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 crest factor overcurrent protection circuit applied to an electronic ballast, and mainly aims to solve the problem that the service life of the electronic ballast is shortened due to no overcurrent protection of a resonant inductor in a resonant network of the conventional electronic ballast. The crest factor overcurrent protection circuit comprises a current sampling circuit, an averaging circuit and a comparison circuit, wherein the averaging circuit is connected between the current sampling circuit and the comparison circuit and is used for averaging transient voltage signals output by the current sampling circuit, multiplying the mean value to obtain an average voltage signal representing an inductive current mean value, and outputting the average voltage signal to the other input end of the comparison circuit; and the comparison circuit compares the average voltage signal with the transient voltage signal output by the current sampling circuit and outputting a crest factor overcurrent protection signal to realize the crest factor overcurrent protection of different inductors. The crest factor overcurrent protection circuit can be used for overcurrentprotection of the electronic ballast and failure detection of a fluorescent lamp.

Description

technical field [0001] The invention belongs to electronic circuits, in particular to a protection circuit, which can be applied to crest factor overcurrent protection in electronic ballasts. Background technique [0002] With the advantages of high operating frequency, low power consumption, high efficiency, and small size, electronic ballasts have gradually replaced traditional magnetic ballasts and penetrated into various lighting systems. The resonant network of electronic ballasts is composed of resonant inductors, resonant capacitors and lamps. In applications, electronic ballast chips are generally packaged together with resonant inductors and resonant capacitors, and then connected to corresponding fluorescent lamps, so even if the chip itself is not damaged, If the resonant inductor is damaged, it is considered that the electronic ballast is damaged. [0003] When the fluorescent lamp has been ignited and working normally, if the lamp is broken or the lamp is remov...

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): H05B41/285H02H3/08
CPCY02B20/183Y02B20/00
Inventor 来新泉王松林袁冰赵永瑞任娟丽李先锐田磊
Owner 拓尔微电子股份有限公司
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