CN105430791A - LED dimming circuit - Google Patents
LED dimming circuit Download PDFInfo
- Publication number
- CN105430791A CN105430791A CN201510805230.XA CN201510805230A CN105430791A CN 105430791 A CN105430791 A CN 105430791A CN 201510805230 A CN201510805230 A CN 201510805230A CN 105430791 A CN105430791 A CN 105430791A
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- CN
- China
- Prior art keywords
- module
- phase shift
- led light
- light adjusting
- pwm comparison
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses an LED dimming circuit. A control circuit comprises three parts, so that the dimming circuit can be endowed with functions of selecting load paths and different dimming frequencies; a clock module is provided with an oscillator, so that the problem of reduced precision caused by the fact that an error generated by a previous operational amplifier is amplified through a next operational amplifier can be solved; a shaping circuit is arranged in a PWM comparison module, so that the dimming circuit can adapt to signals in more ranges; and a phase difference between each group of dimming signals in the PWM comparison module is 1-3pi/n, so that the dimming range can be expanded; and therefore, the dimming circuit has very high application values.
Description
Technical field
The present invention relates to and belong to LED circuit field, be specifically related to a kind of LED light adjusting circuit.
Background technology
Light-emitting diode is the solid-state cold light source of a kind of novel semi-conductor, is the white knowledge lamp that continues, and the forth generation new light sources after dash forward light modulation and high-intensity discharge lamp, has the advantage such as low-power consumption, long-life.LED illumination is a kind of typical energy-saving and environmental protection green illumination.Therefore, when environmental protection pressure day by day strengthen be becoming tight with global energy day, oneself is acknowledged as a kind of important channel of energy-conserving and environment-protective to use LED illumination.So LED illumination is widely used in the every field in life, this further improves the development of LED illumination technology.LED utilizes semiconductor PN or similar structures that electric energy is converted to the device of luminous energy.Current LED light adjusting circuit also exists the problem that precision is low, dimming scope is narrow.
Summary of the invention
The object of the present invention is to provide a kind of LED light adjusting circuit.
For achieving the above object, the invention provides following technical scheme: a kind of LED light adjusting circuit, described LED light adjusting circuit comprises control circuit, clock module, phase shift module and PWM comparison module, described control circuit and clock module, phase shift module is connected with PWM comparison module, described control circuit is by controlling clock module, phase shift module and PWM comparison module generate corresponding dim signal, described clock module is connected with phase shift module, for light modulating frequency provides the clock signal of benchmark, described phase shift module is the access situation according to load, frequency division and phase shift are carried out to the reference frequency of its input, described PWM comparison module is connected with phase shift module, produce corresponding light modulation envelope signal by the result of phase shift module frequency division and phase shift under the effect of control circuit, thus change luminosity.
Preferably, described control circuit comprises three parts, and one is select relevant control module ISEN-CTR with ISEN port; Two is control module SEL-CTs relevant to SEL port voltage; Three is selection circuits relevant to mode of operation.
Preferably, described clock module is provided with oscillator, and described oscillator is relaxation oscillator.
Preferably, described phase shift module comprises counter and saw-toothed wave generator, and described counter produces the pulse signal of different frequency, thus generates the sawtooth waveforms of different frequency by saw-toothed wave generator.
Preferably, shaping circuit is provided with in described PWM comparison module.
Preferably, in described PWM comparison module, the phase difference often organized between dim signal is 1-3pi/n.
The beneficial effect of above technical scheme is adopted to be: to the invention provides a kind of LED light adjusting circuit, described control circuit comprises three parts, light adjusting circuit can be made to have and to select load way and the function selecting different light modulating frequency, described clock module is provided with oscillator, the error that can solve because of the generation of prime amplifier is amplified thus the problem causing precision to reduce by rear stage amplifier, shaping circuit is provided with in described PWM comparison module, the signal that light adjusting circuit adapts in more multiregion can be made, the phase difference often organized in described PWM comparison module between dim signal is 1-3pi/n, the scope of light modulation can be expanded, there is very high using value.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiments of the invention.
Fig. 2 is the clock module isoboles of an oscillator.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
embodiment
A kind of LED light adjusting circuit, described LED light adjusting circuit comprises control circuit, clock module, phase shift module and PWM comparison module, described control circuit and clock module, phase shift module is connected with PWM comparison module, described control circuit is by controlling clock module, phase shift module and PWM comparison module generate corresponding dim signal, described clock module is connected with phase shift module, for light modulating frequency provides the clock signal of benchmark, described phase shift module is the access situation according to load, frequency division and phase shift are carried out to the reference frequency of its input, described PWM comparison module is connected with phase shift module, produce corresponding light modulation envelope signal by the result of phase shift module frequency division and phase shift under the effect of control circuit, thus change luminosity.
Described control circuit comprises three parts, and one is select relevant control module ISEN-CTR with ISEN port; Two is control module SEL-CTs relevant to SEL port voltage; Three is selection circuits relevant to mode of operation, described clock module is provided with oscillator, described oscillator is relaxation oscillator, described phase shift module comprises counter and saw-toothed wave generator, described counter produces the pulse signal of different frequency, thus the sawtooth waveforms of different frequency is generated by saw-toothed wave generator, be provided with shaping circuit in described PWM comparison module, the phase difference often organized in described PWM comparison module between dim signal is 2pi/n.
LED light adjusting circuit operation principle: select as required to select the wherein one in relevant control module ISEN-CTR, the control module SEL-CT be correlated with SEL port voltage or the selection circuit of being correlated with mode of operation with ISEN port, clock module provides the clock signal of benchmark for light modulating frequency, phase shift module is according to the access situation of load, frequency division and phase shift are carried out to the reference frequency of its input, PWM comparison module produces corresponding light modulation envelope signal by the result of phase shift module frequency division and phase shift under the effect of control circuit, thus changes luminosity.
The invention provides a kind of LED light adjusting circuit, described control circuit comprises three parts, light adjusting circuit can be made to have and to select load way and the function selecting different light modulating frequency, described clock module is provided with oscillator, the error that can solve because of the generation of prime amplifier is amplified thus the problem causing precision to reduce by rear stage amplifier, shaping circuit is provided with in described PWM comparison module, the signal that light adjusting circuit adapts in more multiregion can be made, the phase difference often organized in described PWM comparison module between dim signal is 1-3pi/n, the scope of light modulation can be expanded, there is very high using value.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.
Claims (6)
1. a LED light adjusting circuit, it is characterized in that, described LED light adjusting circuit comprises control circuit, clock module, phase shift module and PWM comparison module, described control circuit and clock module, phase shift module is connected with PWM comparison module, described control circuit is by controlling clock module, phase shift module and PWM comparison module generate corresponding dim signal, described clock module is connected with phase shift module, for light modulating frequency provides the clock signal of benchmark, described phase shift module is the access situation according to load, frequency division and phase shift are carried out to the reference frequency of its input, described PWM comparison module is connected with phase shift module, produce corresponding light modulation envelope signal by the result of phase shift module frequency division and phase shift under the effect of control circuit, thus change luminosity.
2. a kind of LED light adjusting circuit according to claim 1, is characterized in that: described control circuit comprises three parts, and one is select relevant control module ISEN-CTR with ISEN port; Two is control module SEL-CTs relevant to SEL port voltage; Three is selection circuits relevant to mode of operation.
3. a kind of LED light adjusting circuit according to claim 1, is characterized in that: described clock module is provided with oscillator, and described oscillator is relaxation oscillator.
4. a kind of LED light adjusting circuit according to claim 1, it is characterized in that: described phase shift module comprises counter and saw-toothed wave generator, described counter produces the pulse signal of different frequency, thus generates the sawtooth waveforms of different frequency by saw-toothed wave generator.
5. according to claim 1 a kind of LED light adjusting circuit, it is characterized in that: in described PWM comparison module, be provided with shaping circuit.
6. a kind of LED light adjusting circuit according to claim 1, is characterized in that: the phase difference often organized in described PWM comparison module between dim signal is 1-3pi/n.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805230.XA CN105430791A (en) | 2015-11-20 | 2015-11-20 | LED dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805230.XA CN105430791A (en) | 2015-11-20 | 2015-11-20 | LED dimming circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105430791A true CN105430791A (en) | 2016-03-23 |
Family
ID=55508647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510805230.XA Pending CN105430791A (en) | 2015-11-20 | 2015-11-20 | LED dimming circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105430791A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100164394A1 (en) * | 2008-03-21 | 2010-07-01 | Richtek Technology Corp. | Led control circuit and method |
| CN103747569A (en) * | 2013-12-25 | 2014-04-23 | 矽力杰半导体技术(杭州)有限公司 | PWM light modulation control method and control circuit, and LED driving circuit applying same |
-
2015
- 2015-11-20 CN CN201510805230.XA patent/CN105430791A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100164394A1 (en) * | 2008-03-21 | 2010-07-01 | Richtek Technology Corp. | Led control circuit and method |
| CN103747569A (en) * | 2013-12-25 | 2014-04-23 | 矽力杰半导体技术(杭州)有限公司 | PWM light modulation control method and control circuit, and LED driving circuit applying same |
Non-Patent Citations (1)
| Title |
|---|
| 文皓: "多路LED调光电路的研究与设计", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160323 |