LED drive circuit capable of improving stroboscopic phenomenon
An LED driver and LED module technology, applied in the field of electronic technology, can solve the problems of eye strain, increased stroke, LED power supply voltage and current ripple, etc. Effect
Inactive Publication Date: 2013-07-24
成都茂扬电子科技股份有限公司
View PDF3 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
But there is a problem with such a driving scheme: since the large-capacity electrolytic capacitor used for primary filtering is removed from the DC power supply, the supply voltage and current of the LED have relatively large ripples, mainly because the frequency is twice the power frequency. Taking 50HZ AC power supply in my country as an example, the ripple frequency is 100HZ
Although the 100HZ LED flicker is theoretically invisible to the human eye, in some demanding occasions, the 100HZ stroboscopic lighting is still unacceptable, because this kind of flicker will bring a flash effect, and multiple images of moving objects will appear during photography. This can cause security cameras to lose important footage
At the same time, there are some opinions that 100HZ strobe will affect the health of the human body. According to reports, 100HZ strobe may cause some people dizziness, eye strain, and migraine may also increase the risk of stroke.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] After the mains input is rectified, there is no large-capacity electrolytic capacitor for filtering, which is the main cause of flicker without electrolytic capacitor. figure 1 It is the AC voltage waveform input from the mains. Taking my country as an example, the mains is 220V, 50Hz AC. figure 2 It is the voltage waveform of the full-bridge rectification after the mains input. After rectification, the frequency of the voltage waveform becomes twice the frequency of the mains, taking my country as an example, it becomes 100Hz. Figure 5 It is a non-electrolytic capacitor LED driving waveform that usually flickers at 2 times the frequency of the mains. The waveform of the driving current is an envelope shape. The rise and fall of the envelope are consistent with the waveform after the mains is rectified by the full bridge. After rectification, there is no large-capacity electrolytic capacitor for filtering, only small-capacity film capacitors or ceramic capacitors for simp...
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
Login to View More Abstract
The invention discloses an LED drive circuit capable of improving a stroboscopic phenomenon, and relates to the electronic technology. The LED drive circuit comprises an alternating current input end and a first set of non-electrolytic-capacitor drive module. The LED drive circuit is characterized by further comprising a phase-shift circuit module and a second set of non-electrolytic-capacitor drive module which is connected with the alternating current input end through the phase-shift circuit module. According to the LED drive circuit, the stroboscopic phenomenon of a non-electrolytic-capacitor LED lighting double alternating current power frequency is removed, lighting quality is improved, a non-electrolytic-capacitor LED drive scheme can be applied to move occasions, and especially a non-electrolytic-capacitor LED can be applied to tunnel lighting, security and protection lighting and other special lighting markets.
Description
technical field [0001] The present invention relates to electronic technology. Background technique [0002] LED is a new type of semiconductor lighting technology, which has the incomparable advantages of traditional lighting such as incandescent lamps: high luminous efficiency, good light color, high reliability, long life, etc. Since entering the 21st century, especially after 2010, with the continuous advancement of technology and the reduction of cost, LED lighting has entered the stage of large-scale commercial use. One of the most attractive aspects of LED lighting is its long life and high reliability. However, since it needs to be powered by a DC power supply, such a DC power supply usually includes an electrolytic capacitor to provide rectification and filtering. Due to the special structure of electrolytic capacitors, the service life is usually not long, and there are few electrolytic capacitors with a rated life of more than 10,000 hours, which is extremely in...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 王文君陈佳范茂
Owner 成都茂扬电子科技股份有限公司