CN203942687U - A kind of isolated form constant-current dimming circuit - Google Patents
A kind of isolated form constant-current dimming circuit Download PDFInfo
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- CN203942687U CN203942687U CN201420364813.4U CN201420364813U CN203942687U CN 203942687 U CN203942687 U CN 203942687U CN 201420364813 U CN201420364813 U CN 201420364813U CN 203942687 U CN203942687 U CN 203942687U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a kind of isolated form constant-current dimming circuit, comprise the EMI filter circuit connecting successively, the first current rectifying and wave filtering circuit, transformer, the second current rectifying and wave filtering circuit and LED load, LED load is also connected with an input of comparator by sampling resistor, another input of comparator is connected with the output of reference voltage conversion circuit, the input of reference voltage conversion circuit is connected with the PWM output of single-chip microcomputer, the output of comparator is connected with optocoupler feedback circuit in turn, power drives chip circuit, transistorized grid is connected, transistorized collector electrode is connected with the output of transformer, formation can regulate and control constant-current source, for making the constant electric current of transformer output.The utility model, can realize accurate light modulation, in light modulation process, is that real-time constant current is controlled, and has greatly improved flexibility, the operability of light modulation simultaneously, without light modulation chip, extends the working life of LED lamp, has a good application prospect.
Description
Technical field
The utility model relates to a kind of isolated form constant-current dimming circuit, belongs to illumination applied technical field.
Background technology
Be accompanied by the day by day ripe of LED illumination application technology, Based Intelligent Control ligthing paraphernalia is shown up prominently gradually at illuminating industry, and rapidly, the demand in each producer's adaptation market has been released the power drives chip of various dimming functions to the development of LED lighting dimming utensil gradually.
At present, LED dimming driving circuit on market has linearity light adjusting, controllable silicon light modulation and PWM light modulation, wherein linearity light adjusting is dumb, inefficiency, also can produce too much heat because of dividing potential drop simultaneously, thyristor regulating photo damage sinusoidal wave waveform, thereby reduced power factor (PF) value, strengthened harmonic constant, also can produce on the line serious interference signal simultaneously, especially when low load, be easy to unstable, power consumption is large, and the realization of PWM light modulation relatively is preferably all pwm signal to be given to the functional pin of light modulation chip, realize the function of light modulation, but, the characteristic of driving chip at present with dimming function is very different, had a strong impact on the flexibility of PWM dimmer circuit design, also have the inside setting of light modulation chip to fix, user cannot in the light of actual conditions carry out satisfactory dimmer design.
Utility model content
The purpose of this utility model is the LED dimming driving circuit overcoming on market, and linearity light adjusting is dumb, inefficiency, PWM light modulation very flexible, and user cannot in the light of actual conditions carry out the problem of satisfactory dimmer design.Isolated form constant-current dimming circuit of the present utility model, can realize accurate light modulation, without light modulation chip, in light modulation process, is that real-time constant current is controlled, and extends the working life of LED lamp, and stable output, has a good application prospect.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of isolated form constant-current dimming circuit, it is characterized in that: comprise the EMI filter circuit connecting successively, the first current rectifying and wave filtering circuit, transformer, the second current rectifying and wave filtering circuit and LED load, described LED load is also connected with an input of comparator by sampling resistor, another input of described comparator is connected with the output of reference voltage conversion circuit, the input of described reference voltage conversion circuit is connected with the PWM output of single-chip microcomputer, the output of described comparator is connected with optocoupler feedback circuit, described optocoupler feedback circuit is also connected with power drives chip circuit, the output of described power drives chip circuit is connected with transistorized grid, described transistorized collector electrode is connected with the output of transformer, formation can regulate and control constant-current source, for making the constant electric current of transformer output.
A kind of isolated form constant-current dimming circuit, it is characterized in that: comprise the EMI filter circuit connecting successively, the first current rectifying and wave filtering circuit, transformer, the second current rectifying and wave filtering circuit and LED load, described LED load is also connected with an input of comparator by sampling resistor, another input of described comparator is connected with the output of reference voltage conversion circuit, the input of described reference voltage conversion circuit is connected with the PWM output of single-chip microcomputer, the output of described comparator is connected with optocoupler feedback circuit, described optocoupler feedback circuit is also connected with power drives chip circuit, the output of described power drives chip circuit is connected with transistorized grid, described transistorized collector electrode is connected with the output of transformer, formation can regulate and control constant-current source, for making the constant electric current of transformer output.
Aforesaid a kind of isolated form constant-current dimming circuit, is characterized in that: described single-chip microcomputer is also connected with infrared receiving circuit, wireless WIFI receiving circuit.
Aforesaid a kind of isolated form constant-current dimming circuit, is characterized in that: described transistor is metal-oxide-semiconductor.
Aforesaid a kind of isolated form constant-current dimming circuit, is characterized in that: described sampling resistor is high-precision power-type resistance.
Aforesaid a kind of isolated form constant-current dimming circuit, it is characterized in that: described reference voltage conversion circuit comprises switch MOS pipe, reference voltage source, filter circuit, the grid of described switch MOS pipe is connected as the input of reference voltage conversion circuit and the PWM output of single-chip microcomputer, the source electrode of described switch MOS pipe is connected with the output of reference voltage source, the drain electrode of described switch MOS pipe is connected with the input of filter circuit, and the output of described filter circuit is connected with comparator as the output of reference voltage conversion circuit.
The beneficial effects of the utility model are: isolated form constant-current dimming circuit of the present utility model, can realize accurate light modulation, in light modulation process, be that real-time constant current is controlled, flexibility, the operability of light modulation have greatly been improved simultaneously, without light modulation chip, extend the working life of LED lamp, stable output, cost is lower, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the system block diagram of isolated form constant-current dimming circuit of the present utility model.
Fig. 2 is the system block diagram of reference voltage conversion circuit of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.Following examples are only for the technical solution of the utility model is more clearly described, and can not limit protection range of the present utility model with this.
As shown in Figure 1, a kind of isolated form constant-current dimming circuit, comprise the EMI filter circuit connecting successively, the first current rectifying and wave filtering circuit, transformer, the second current rectifying and wave filtering circuit and LED load, described LED load is also connected with an input of comparator by sampling resistor, another input of described device is connected with the output of reference voltage conversion circuit, the input of described reference voltage conversion circuit is connected with the PWM output of single-chip microcomputer, the output of described comparator is connected with optocoupler feedback circuit, described optocoupler feedback circuit is also connected with power drives chip circuit, the output of described power drives chip circuit is connected with transistorized grid, described transistorized collector electrode is connected with the output of transformer, formation can regulate and control constant-current source, for making the constant electric current of transformer output.
Described single-chip microcomputer is also connected with infrared receiving circuit, wireless WIFI receiving circuit, can realize and by remote controller, accept circuit and carry out instruction and transform the IO port output to single-chip microcomputer, control single chip computer is exported corresponding PWM ripple, by reference voltage conversion circuit, be converted to reference voltage (can modulation), control can regulate and control the size of the constant electric current of constant-current source, and then realizes the Based Intelligent Control to light modulations such as LED.
Described transistor is metal-oxide-semiconductor, and On current is little, low in energy consumption, long service life, and sampling resistor is high-precision power-type resistance, the current precision that gathers LED load is high, is convenient to improve the reliability of controlling.
As shown in Figure 2, described reference voltage conversion circuit comprises switch MOS pipe, reference voltage source, filter circuit, the grid of switch MOS pipe is connected as the input of reference voltage conversion circuit and the PWM output of single-chip microcomputer, the source electrode of switch MOS pipe is connected with the output of reference voltage source, the drain electrode of described switch MOS pipe is connected with the input of filter circuit, the output of described filter circuit is connected with comparator as the output of reference voltage conversion circuit, here select LM431 chip as reference voltage source, single-chip microcomputer provides the ON time of PWM ripple control switch metal-oxide-semiconductor, thereby realize the conversion adjustment to reference voltage, change in real time the size of reference voltage, variable reference voltage passes through comparator, thereby control the size of the constant electric current that can regulate and control constant-current source, and then the Based Intelligent Control of realization to light modulations such as LED.
In sum, isolated form constant-current dimming circuit of the present utility model, can realize accurate light modulation, in light modulation process, be that real-time constant current is controlled, greatly improved flexibility, the operability of light modulation, without light modulation chip simultaneously, extend the working life of LED lamp, stable output, cost is lower, has a good application prospect.
More than show and described basic principle of the present utility model, principal character and advantage.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. an isolated form constant-current dimming circuit, it is characterized in that: comprise the EMI filter circuit connecting successively, the first current rectifying and wave filtering circuit, transformer, the second current rectifying and wave filtering circuit and LED load, described LED load is also connected with an input of comparator by sampling resistor, another input of described comparator is connected with the output of reference voltage conversion circuit, the input of described reference voltage conversion circuit is connected with the PWM output of single-chip microcomputer, the output of described comparator is connected with optocoupler feedback circuit, described optocoupler feedback circuit is also connected with power drives chip circuit, the output of described power drives chip circuit is connected with transistorized grid, described transistorized collector electrode is connected with the output of transformer, formation can regulate and control constant-current source, for making the constant electric current of transformer output.
2. a kind of isolated form constant-current dimming circuit according to claim 1, is characterized in that: described single-chip microcomputer is also connected with infrared receiving circuit, wireless WIFI receiving circuit.
3. a kind of isolated form constant-current dimming circuit according to claim 1, is characterized in that: described transistor is metal-oxide-semiconductor.
4. a kind of isolated form constant-current dimming circuit according to claim 1, is characterized in that: described sampling resistor is high-precision power-type resistance.
5. a kind of isolated form constant-current dimming circuit according to claim 1, it is characterized in that: described reference voltage conversion circuit comprises switch MOS pipe, reference voltage source, filter circuit, the grid of described switch MOS pipe is connected as the input of reference voltage conversion circuit and the PWM output of single-chip microcomputer, the source electrode of described switch MOS pipe is connected with the output of reference voltage source, the drain electrode of described switch MOS pipe is connected with the input of filter circuit, and the output of described filter circuit is connected with comparator as the output of reference voltage conversion circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420364813.4U CN203942687U (en) | 2014-07-03 | 2014-07-03 | A kind of isolated form constant-current dimming circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420364813.4U CN203942687U (en) | 2014-07-03 | 2014-07-03 | A kind of isolated form constant-current dimming circuit |
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| CN203942687U true CN203942687U (en) | 2014-11-12 |
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| CN201420364813.4U Expired - Fee Related CN203942687U (en) | 2014-07-03 | 2014-07-03 | A kind of isolated form constant-current dimming circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104507239A (en) * | 2015-01-06 | 2015-04-08 | 宁波江北华瑞电子有限公司 | General energy-saving LED (light-emitting diode) drive power supply device |
| CN104812141A (en) * | 2015-05-11 | 2015-07-29 | 深圳市大族照明科技有限公司 | LED (light emitting diode) power supply power controller realizing smooth dimming by switch |
| CN106488614A (en) * | 2016-12-01 | 2017-03-08 | 意诺科技有限公司 | A kind of driver and a kind of method of supplying power to |
| 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 |
| CN106793279A (en) * | 2016-12-13 | 2017-05-31 | 四川长虹电子部品有限公司 | A kind of adjustable constant current output power module and implementation method |
| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN109862654A (en) * | 2018-09-26 | 2019-06-07 | 深圳市中州远光照明科技有限公司 | A kind of isolated form LED driving circuit and driving method thereof |
-
2014
- 2014-07-03 CN CN201420364813.4U patent/CN203942687U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104507239A (en) * | 2015-01-06 | 2015-04-08 | 宁波江北华瑞电子有限公司 | General energy-saving LED (light-emitting diode) drive power supply device |
| CN104812141A (en) * | 2015-05-11 | 2015-07-29 | 深圳市大族照明科技有限公司 | LED (light emitting diode) power supply power controller realizing smooth dimming by switch |
| CN104812141B (en) * | 2015-05-11 | 2018-02-27 | 深圳市大族视觉技术有限公司 | Switch smooth light modulation LED power supply power controller |
| CN106488614A (en) * | 2016-12-01 | 2017-03-08 | 意诺科技有限公司 | A kind of driver and a kind of method of supplying power to |
| 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 |
| CN106793279A (en) * | 2016-12-13 | 2017-05-31 | 四川长虹电子部品有限公司 | A kind of adjustable constant current output power module and implementation method |
| CN106793279B (en) * | 2016-12-13 | 2019-09-13 | 四川虹锐电工有限责任公司 | A kind of adjustable constant current output power module and implementation method |
| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN109862654A (en) * | 2018-09-26 | 2019-06-07 | 深圳市中州远光照明科技有限公司 | A kind of isolated form LED driving circuit and driving method thereof |
| CN109862654B (en) * | 2018-09-26 | 2020-12-11 | 江西通利晟电子科技有限公司 | Isolated LED driving circuit and driving method thereof |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141112 |
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| CF01 | Termination of patent right due to non-payment of annual fee |