CN203352865U - LED dimming system - Google Patents
LED dimming system Download PDFInfo
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- CN203352865U CN203352865U CN 201320245241 CN201320245241U CN203352865U CN 203352865 U CN203352865 U CN 203352865U CN 201320245241 CN201320245241 CN 201320245241 CN 201320245241 U CN201320245241 U CN 201320245241U CN 203352865 U CN203352865 U CN 203352865U
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Abstract
The LED dimming system comprises a power supply and a dimming module, the dimming module comprises an operational amplifier, sampling signals FB are inputted to one terminal of the operational amplifier, and reference voltage is inputted to the other terminal. The sampling signals FB sample current or voltage flowing through the periphery of an LED luminous module, and the luminance of the external LED luminous module is adjusted by comparison of the sampling signals and the reference voltage. The power supply output of a high frequency switch power supply is changed by changing the reference voltage so that the light intensity can be adjusted; in a dimming process, no PWM dimming alternating components are provided, and the current changes continuously without hopping so that no stroboscopic phenomena appear during dimming, which is good for eye health; the LED dimming system is advantaged by simple circuit structure, less requirement for hardware of the circuit, and low cost, and the LED dimming system is applicable to large-scale industrial production.
Description
[technical field]
The utility model relates to the LED lighting field, particularly a kind of LED light adjusting system based on power supply.
[background technology]
The LED light fixture has the incomparable advantages of many conventional light source such as energy-saving and environmental protection, toggle speed are fast, and LED becomes rapidly the main body of illumination, and it is widely used in family, factory, the numerous areas such as traffic.In the middle of illumination, we can have different brightness demands to the LED light fixture at different time and different location usually, therefore, need design can carry out the LED light fixture of certain brightness regulation.
Current existing LED light modulation principle is divided into two kinds, and a kind of is linear regulation LED electric current, that is, the simulation light modulation, the second is to change the mean value of light output, i.e. digital dimming with sufficiently high frequency work with respect to eye recognition power with switching circuit.What existing most of LED light fixture was used is the PWM light regulating technology, it is digital dimming, stroboscopic phenomenon not only easily occurs in the PWM light modulation, and Switching Power Supply is had to very large rush of current, be unfavorable for that Switching Power Supply is long-term, stable, reliably working, high to the circuit hardware requirement, the circuit complexity, cost is high.
[utility model content]
For overcoming current PWM light modulation, exist stroboscopic phenomenon and driving power to be subject to rush of current large, circuit hardware requires high, the circuit complexity, the shortcoming that cost is high, the utility model proposes a kind of without stroboscopic, driving power safety, reliable and stable, circuit is simple, the light adjusting system that cost is low.
The utility model provides a kind of LED light adjusting system, it comprises a power supply and a light-adjusting module, this light-adjusting module comprises an operational amplifier, this operational amplifier one end input sample signal FB, other end input reference voltage, sampled signal FB is sampled to the curtage that flows through the peripheral LED illuminating module, by the luminosity of relatively regulating the external LED illuminating module of sampled signal and reference voltage.
Preferably, this operational amplifier output terminal is provided with the feedback voltage module, and the feedback voltage module is connected with power supply, for the Voltage-output of regulating power supply and then the luminosity that affects the LED illuminating module.
Preferably, an end of operational amplifier input reference voltage is connected with the moved end of a single-pole double-throw switch (SPDT).
Preferably, not moved end one end of this single-pole double-throw switch (SPDT) connects the reference voltage module.
Preferably, another of this hilted broadsword throw switch not moved end connects voltage regulating module, and this voltage regulating module is connected with the reference voltage module, can regulate the reference voltage size.
A kind of LED light adjusting system of the utility model, change the power supply output size of high frequency switch power by changing reference voltage, thereby reach the purpose of regulating intensity of light, what this light modulation adopted is the linear current light modulation, in the light modulation process, current continuity changes without saltus step, therefore, light modulation, also without stroboscopic phenomenon, has realized Healthy Lighting.This LED light adjusting system circuit structure is simple, and not high to the hardware requirement of circuit, cost is low, the suitable industrial production of carrying out in a large number.
[accompanying drawing explanation]
Fig. 1 is a kind of LED light adjusting system of the utility model circuit diagram.
[embodiment]
In order to make the purpose of this utility model, technical scheme and advantage are clearer, below in conjunction with accompanying drawing and embodiment, the utility model are further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, LED light adjusting system 10 comprises a high frequency switch power 101 and a light-adjusting module 102, and this high frequency switch power 101 is connected with light-adjusting module 102, and light-adjusting module 102 matches and realizes dimming function with high frequency switch power 101.
Light-adjusting module 102 comprises feedback voltage module 1021, one reference voltage module 1022, one voltage regulating module 1023, one operational amplifiers 1024 and single-pole double-throw switch (SPDT)s 1025.The in-phase input end of this operational amplifier 1024 connects the moved end of single-pole double-throw switch (SPDT) 1025, inverting input input external circuit sampled signal FB, its output connects feedback voltage module 1021, single-pole double-throw switch (SPDT) 1025 comprises two not moved ends, these two not moved end one end with reference voltage module 1022, be connected, another is not connected with voltage regulating module 1023 moved end.In addition, voltage regulating module 1023 is connected with reference voltage module 1022, and feedback voltage module 1021 is connected to high frequency switch power 101.
This LED light adjusting system 10 carries out the voltage/current sampling by sampled signal FB to LED illuminating module (not shown), after FB terminal voltage and reference voltage module 1022 or the set reference voltage of voltage regulating module 1023 are compared, output signal passes to feedback voltage module 1021, feedback voltage module 1021 receives after signal signal back high frequency switch power 101, and high frequency switch power 101 is controlled the brightness of LED illuminating module by changing power supply output size.
This this single-pole double-throw switch (SPDT) 1025 comprises not moved end of a moved end and two, its moved end is connected to the in-phase input end of operational amplifier 1024, one not moved end is connected and realizes permanent optical illumination with reference voltage module 1022, another is not connected and realizes lighting dimming with voltage regulating module 1023 in moved end, by changing the not tie point of moved end, can select permanent optical illumination or lighting dimming.
This reference voltage module 1022 is for reference voltage is set, and the reference voltage size affects the luminosity of LED illuminating module.One of reference voltage module 1022 and single-pole double-throw switch (SPDT) 1025 is connected with light-adjusting module 1023 again when moved end is not connected.
This light-adjusting module 1023, for changing the set reference voltage size of reference voltage module 1022, can be controlled the brightness of giving out light of LED illuminating module by the size that changes reference voltage.
This operational amplifier 1024 is used for the set reference voltage of comparison sampled signal FB terminal voltage and reference voltage module 1022 or light-adjusting module 1023, by the comparison between two voltages, and then the output size of output signal control high frequency switch power 101, thereby reach the purpose of controlling the brightness of LED illuminating module.
This feedback voltage module 1021 feeds back to high frequency switch power 101 after being processed for the signal that operational amplifier 1024 is exported, and controls the output size of high frequency switch power 101.
During permanent optical illumination, the not moved end of single-pole double-throw switch (SPDT) 1025 is connected on reference voltage module 1022, the reference voltage size remains unchanged, and its size equates with the voltage swing that the FB end is sampled, now, operational amplifier 1024 no-outputs, no signal is transferred to high frequency switch power 101, high frequency switch power 101 output sizes are constant, and LED illuminating module luminosity is constant.
While needing the luminosity of LED illuminating module is regulated in illumination, the not moved end of single-pole double-throw switch (SPDT) 1025 is connected on light-adjusting module 1023, by light-adjusting module 1023, can changes the reference voltage size.While turning down reference voltage, when the FB terminal voltage is greater than reference voltage, operational amplifier 1024 output high level, feedback voltage module 1021, by signal back high frequency switch power 101, is regulated (minimizing) high frequency switch power 101 pulsewidths, forces high frequency switch power 101 output voltages (V+) to reduce, LED illuminating module luminosity subtracts secretly even shutoff, otherwise increase high frequency switch power 101 pulsewidths, improve output (V+) voltage, LED illuminating module luminosity increases.So, by comparing with sampled voltage with reference voltage, change the reference voltage size and can change the working point of LED illuminating module, thereby reach the purpose of regulating intensity of light.
A kind of LED light adjusting system 10 of the utility model, change the power supply output size of high frequency switch power 101 by changing reference voltage, thereby reach the purpose of regulating intensity of light, what this light modulation adopted is the linear current light modulation, in the light modulation process, current continuity changes without saltus step, therefore, light modulation, also without stroboscopic phenomenon, has realized Healthy Lighting.These LED light adjusting system 10 circuit structures are simple, and not high to the hardware requirement of circuit, cost is low, the suitable industrial production of carrying out in a large number.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within principle of the present utility model, be equal to and replace and within improvement etc. all should comprise protection range of the present utility model.
Claims (5)
1. a LED light adjusting system, comprise a power supply and a light-adjusting module, it is characterized in that: this light-adjusting module comprises an operational amplifier, this operational amplifier one end input sample signal FB, other end input reference voltage, sampled signal FB is sampled to the curtage that flows through the peripheral LED illuminating module, by the luminosity of relatively regulating the external LED illuminating module of sampled signal and reference voltage.
2. LED light adjusting system as claimed in claim 1, it is characterized in that: this operational amplifier output terminal is provided with the feedback voltage module, and the feedback voltage module is connected with power supply, for the Voltage-output of regulating power supply and then the luminosity that affects the LED illuminating module.
3. LED light adjusting system as claimed in claim 1, it is characterized in that: an end of operational amplifier input reference voltage is connected with the moved end of a single-pole double-throw switch (SPDT).
4. LED light adjusting system as claimed in claim 3, is characterized in that: the not moved end one end connection reference voltage module of this single-pole double-throw switch (SPDT).
5. LED light adjusting system as claimed in claim 4 is characterized in that: another of this single-pole double-throw switch (SPDT) not moved end connects voltage regulating module, and this voltage regulating module is connected with the reference voltage module, can regulate the reference voltage size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320245241 CN203352865U (en) | 2013-04-23 | 2013-04-23 | LED dimming system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320245241 CN203352865U (en) | 2013-04-23 | 2013-04-23 | LED dimming system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352865U true CN203352865U (en) | 2013-12-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320245241 Expired - Fee Related CN203352865U (en) | 2013-04-23 | 2013-04-23 | LED dimming system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203352865U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507540A (en) * | 2016-12-01 | 2017-03-15 | 意诺科技有限公司 | A kind of electric power system and a kind of method of supplying power to |
| CN113556847A (en) * | 2020-04-23 | 2021-10-26 | Tcl科技集团股份有限公司 | LED power supply circuit and backlight system |
-
2013
- 2013-04-23 CN CN 201320245241 patent/CN203352865U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507540A (en) * | 2016-12-01 | 2017-03-15 | 意诺科技有限公司 | A kind of electric power system and a kind of method of supplying power to |
| CN106507540B (en) * | 2016-12-01 | 2018-05-15 | 意诺科技有限公司 | A kind of electric power system and a kind of method of supplying power to |
| CN113556847A (en) * | 2020-04-23 | 2021-10-26 | Tcl科技集团股份有限公司 | LED power supply circuit and backlight system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |