Dimming control circuit and control method of led lamp under low brightness

A dimming control circuit and LED lamp technology, applied in the direction of light sources, electric light sources, electrical components, etc., can solve the problems of losing the dimming effect, failing to realize the dimming effect, and unable to realize the control of the output current, so as to achieve flexible use and Convenience and the effect of expanding the dimming range

Active Publication Date: 2020-01-31
ZHEJIANG KAIYAO LIGHTING
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many types of thyristor dimmers, and some thyristor dimmers will lose their dimming effect when the output current is adjusted below about 3%. The dimmer cannot control the output current, that is, the dimming effect cannot be achieved

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
  • Dimming control circuit and control method of led lamp under low brightness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] Embodiment: the dimming control circuit under the low brightness of the LED lamp of this embodiment, such as figure 1 As shown, including transistor Q1, transistor Q2 and dimming driver 1, the base of transistor Q1 is connected to the positive pole of the dimming driver through resistor R1, and the other is connected to one end of resistor R2, and the other end of resistor R2 is connected through resistor R5 It is connected to the emitter of the transistor Q1, the emitter of the transistor Q1 is connected to the negative pole of the dimming driver, the collector of the transistor Q1 is connected to the positive pole of the dimming driver through the resistor R3, and the collector of the transistor Q1 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the positive pole of the dimming driver and the positive pole of the LED lamp 2, the emitter of the transistor Q2 is connected to one end of the resistor R4, and the other end o...

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 relates to a dimming control circuit and a control method of an LED lamp under low brightness. The dimming control circuit includes triode Q1, triode Q2 and dimming driver. The base of triode Q1 is connected to the positive pole of the dimming driver through resistor R1 and connected to the negative pole of the dimming driver through resistor R2. The collector and emitter of transistor Q1 The poles are respectively connected to the positive and negative poles of the dimming driver, the collector of the transistor Q1 is connected to the base of the transistor Q2, the collector and emitter of the transistor Q2 are respectively connected to the positive and negative poles of the dimming driver, the collector, The emitter is also connected to the positive pole and the negative pole of the LED lamp respectively. When the output current I of the dimming driver is lower than the threshold current value I1 and higher than the threshold current value I2, both the transistor Q1 and the transistor Q2 are in a semi-conducting state. At this time, as the output current I of the dimming driver changes, the current The current passing through the LED lamp changes in a curve to realize the dimming effect of the LED lamp in a low current state.

Description

technical field [0001] The invention relates to an LED lamp drive circuit, in particular to a dimming control circuit and a control method for the LED lamp at low brightness. Background technique [0002] The use of thyristor dimmers to adjust the brightness of lamps has been applied to the dimming circuits of incandescent lamps and energy-saving lamps earlier, and it is also a dimming method widely used in LED lamp dimming solutions. Its working principle is: use the thyristor dimmer to adjust the conduction angle of each half-wave of the AC to change the sinusoidal waveform, change the effective value of the AC input current, and at the same time drive the output current to change accordingly, so as to realize the LED lamp. Dimming effect. However, there are many types of thyristor dimmers, and some thyristor dimmers will lose their dimming effect when the output current is adjusted below about 3%. The dimmer cannot control the output current, that is, it cannot achieve ...

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 Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10
Inventor 谭志鹏
Owner ZHEJIANG KAIYAO LIGHTING
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