CN205213084U - Be used for light source driven to adjust luminance and current -limiting circuit - Google Patents
Be used for light source driven to adjust luminance and current -limiting circuit Download PDFInfo
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- CN205213084U CN205213084U CN201521067793.5U CN201521067793U CN205213084U CN 205213084 U CN205213084 U CN 205213084U CN 201521067793 U CN201521067793 U CN 201521067793U CN 205213084 U CN205213084 U CN 205213084U
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model provides a be used for light source driven to adjust luminance and current -limiting circuit, including AC -DC converting circuit, voltage stabilizing circuit, PFM current -limiting circuit and PWM dimmer circuit. The utility model discloses mainly utilize two integrated comparators of LM358 peripheral return circuit of few in addition, compatible different kinds of light source drive simultaneously, like light sources such as constant voltage driven LED light source or halogen lamp LEDs, realized simultaneously that PWM adjusts luminance and PFM current -limiting function, when being used for some LED displays, reduced the DC -DC constant current return circuit of stepping up, directly supplied LED to be shaded with AC -DC converting circuit to use, can save cost greatly.
Description
Technical field
The utility model relates to the drive circuit of the lighting source such as LED, low-voltage halogen lamp and light-emitting diode display back light, particularly relates to the PWM non-pole light regulating and PFM current-limiting circuit that are applicable to the driving of this kind of specific light source.
Background technology
Along with comprehensive emergence in LED illumination market, the driving design for LED lamp is also varied.But the principle driven due to LED lamp of all kinds is different, the string of LED mode is different, the parameter differences such as voltage and current are very large.A feast for the eyes driving power, brings inconvenience to the selection of user.Larger is not when driving power damages, and when carry out changing, how selecting to change just becomes a stubborn problem.So the LED lamp driving power how designing a compatible different voltage to greatest extent seems particularly important.
Current LCD TV or liquid crystal display are all adopt LED to be backlight substantially.Due to the constant-current characteristics of LED, the power supply that industry is come on TV is generally adopt two-step evolution loop: then the isolated buck being first AC-DC is that DC voltage is divided into two groups, one group for loops such as audio frequency, other one group of constant current boost loop driving LED backlight of carrying out DC-DC.The mode cost compare of this employing two-step evolution is high.
In view of this, be necessary that invention one can be saved DC-DC and to be boosted loop, and the constant voltage loop of direct AC-DC is simultaneously for the light modulation of the loops such as audio frequency together with LED-backlit and current-limiting circuit, just can save a big chunk cost.
Summary of the invention
The technical problems to be solved in the utility model, be to provide a kind of light modulation for light source driving and current-limiting circuit, comprise AC-DC change-over circuit, voltage stabilizing circuit, PFM current-limiting circuit and PWM light adjusting circuit, described PFM current-limiting circuit and PWM light adjusting circuit form multiplier circuit output voltage signal and current signal; Described AC-DC change-over circuit connects voltage stabilizing circuit, voltage stabilizing circuit provides reference voltage signal to PFM current-limiting circuit and PWM light adjusting circuit, described PFM current-limiting circuit comprises the first adjustable resistance and the first comparator, described reference voltage signal accesses an input of the first comparator by the first adjustable resistance, the output current signal of another input input sample of described first comparator, described first comparator exports the first pulse signal; Described PWM light adjusting circuit comprises timing IC, the second adjustable resistance and the second comparator, described reference voltage signal accesses an input of the second comparator by the second adjustable resistance, described timing IC output connects another input of the second comparator, and the triangular signal of fixed frequency is exported to the second comparator, described second comparator exports the second pulse signal; The multiplier be made up of the first comparator and the second comparator is by the first pulse signal and the backward load output voltage signal of the second pulse signal process and current signal.
Further, the multiplier of described first comparator and the second comparator composition adopts model to be the dual operational amplifier of LM358.
Further, the model of described timing IC is NE555.
Further, described voltage stabilizing circuit adopts model to be the integrated regulator of LM7805.
Further, described AC-DC change-over circuit is 7V ~ 42V to the voltage that voltage stabilizing circuit exports.
Further, the frequency of the triangular signal of described timing IC generation is 1KHz ~ 10KHz.
Further, described first comparator output terminal is connected with the first metal-oxide-semiconductor, and described second comparator output terminal is connected with the second metal-oxide-semiconductor.
Further, the signal frequency of described first metal-oxide-semiconductor conducting is 3KHz ~ 100KHz.
The utility model mainly utilizes integrated two comparators of LM358 to add little peripheral loop, can drive by compatible dissimilar light source, the light sources such as the LED light source driven as constant voltage or Halogen lamp LED simultaneously; Achieve PWM light modulation and PFM current-limiting function simultaneously; During for some light-emitting diode displays, decrease DC-DC constant current boost loop, directly use AC-DC change-over circuit for LED-backlit, cost greatly can be saved.
Accompanying drawing explanation
The utility model is further described with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is model calling schematic diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Referring to Fig. 1 and 2, is comprise AC-DC change-over circuit, voltage stabilizing circuit, PFM current-limiting circuit and PWM light adjusting circuit as most preferred embodiment of the present utility model.By AC-DC change-over circuit to each power elements, and input the direct voltage of 7V ~ 42V to described voltage stabilizing circuit and load.Described voltage stabilizing circuit adopts the integrated regulator of LM7805.The d. c. voltage signal of input enters IC1 by voltage stabilizing didoe D7 and resistance R23, and this IC1 is LM7805.Exported the voltage of 5V to IC2 and IC3 by IC1.This IC2 employing model is the timing IC of NE555, and this IC3 adopts model to be the dual operational amplifier of LM358.IC2 corresponding pin connecting resistance R30, resistance R31, electric capacity C31 and electric capacity C32, thus the triangular wave of the 1KHz ~ 10KHz of 1.2KHz is produced at PIN6.The voltage inputting 5V to IC3 by receiving the PIN5 of IC3 after producing corresponding reference voltage U1 after resistance R26, R27 and adjustable resistance RP1 dividing potential drop, by receiving the PIN2 of IC3 after producing corresponding reference voltage U2 after resistance R25 and adjustable resistance RP2 dividing potential drop.The first comparator input terminal input reference voltage U 2 in IC3 and output to the output current signal I1 of sampling of load, the output of IC3 exports the square wave of 3KHz ~ 100KHz, thus be operatively connected to the conducting of the first metal-oxide-semiconductor Q1 of output, realize PFM current-limiting function.The triangular wave that IC2 produces and reference voltage U1 compare tangent, after being input to the second comparator in IC3, exported the square wave of fixed frequency by the second comparator, the output of this second comparator is connected to the second metal-oxide-semiconductor Q2, regulates adjustable resistance RP1 to realize PWM dimming function.
In sum, the utility model mainly utilizes integrated two comparators of LM358 to add little peripheral loop, can drive by compatible dissimilar light source, the light sources such as the LED light source driven as constant voltage or Halogen lamp LED simultaneously; Achieve PWM light modulation and PFM current-limiting function simultaneously; During for some light-emitting diode displays, decrease DC-DC constant current boost loop, directly use AC-DC change-over circuit for LED-backlit, cost greatly can be saved.
By reference to the accompanying drawings the utility model is exemplarily described above; obvious the utility model specific implementation is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present utility model is conceived and technical scheme is carried out; or design of the present utility model and technical scheme directly applied to other occasion, all within protection range of the present utility model without to improve.
Claims (8)
1. the light modulation for light source driving and current-limiting circuit, it is characterized in that, comprise AC-DC change-over circuit, voltage stabilizing circuit, PFM current-limiting circuit and PWM light adjusting circuit, described PFM current-limiting circuit and PWM light adjusting circuit form multiplier circuit output voltage signal and current signal; Described AC-DC change-over circuit connects voltage stabilizing circuit, voltage stabilizing circuit provides reference voltage signal to PFM current-limiting circuit and PWM light adjusting circuit, described PFM current-limiting circuit comprises the first adjustable resistance and the first comparator, described reference voltage signal accesses an input of the first comparator by the first adjustable resistance, the output current signal of another input input sample of described first comparator, described first comparator exports the first pulse signal; Described PWM light adjusting circuit comprises timing IC, the second adjustable resistance and the second comparator, described reference voltage signal accesses an input of the second comparator by the second adjustable resistance, described timing IC output connects another input of the second comparator, and the triangular signal of fixed frequency is exported to the second comparator, described second comparator exports the second pulse signal; The multiplier be made up of the first comparator and the second comparator is by the first pulse signal and the backward load output voltage signal of the second pulse signal process and current signal.
2. the light modulation for light source driving according to claim 1 and current-limiting circuit, is characterized in that, the multiplier of described first comparator and the second comparator composition adopts model to be the dual operational amplifier of LM358.
3. the light modulation for light source driving according to claim 1 and current-limiting circuit, it is characterized in that, the model of described timing IC is NE555.
4. the light modulation for light source driving according to claim 1 and current-limiting circuit, it is characterized in that, described voltage stabilizing circuit adopts model to be the integrated regulator of LM7805.
5. the light modulation for light source driving according to claim 1 and current-limiting circuit, it is characterized in that, described AC-DC change-over circuit is 7V ~ 42V to the voltage that voltage stabilizing circuit exports.
6. the light modulation for light source driving according to claim 1 and current-limiting circuit, is characterized in that, the frequency of the triangular signal that described timing IC produces is 1kHz ~ 10kHz.
7. the light modulation for light source driving according to claim 1 and current-limiting circuit, it is characterized in that, described first comparator output terminal is connected with the first metal-oxide-semiconductor, and described second comparator output terminal is connected with the second metal-oxide-semiconductor.
8. the light modulation for light source driving according to claim 7 and current-limiting circuit, it is characterized in that, the signal frequency of described first metal-oxide-semiconductor conducting is 3kHz ~ 100kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521067793.5U CN205213084U (en) | 2015-12-18 | 2015-12-18 | Be used for light source driven to adjust luminance and current -limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521067793.5U CN205213084U (en) | 2015-12-18 | 2015-12-18 | Be used for light source driven to adjust luminance and current -limiting circuit |
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| CN205213084U true CN205213084U (en) | 2016-05-04 |
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| CN201521067793.5U Active CN205213084U (en) | 2015-12-18 | 2015-12-18 | Be used for light source driven to adjust luminance and current -limiting circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658845A (en) * | 2016-12-20 | 2017-05-10 | 深圳市福瑞新科技有限公司 | Intelligent and fully compatible LED driving power supply circuit |
| WO2018010344A1 (en) * | 2016-07-11 | 2018-01-18 | 深圳迈睿智能科技有限公司 | Stroboflash-free led light modulation driving power supply |
| TWI657719B (en) * | 2018-04-09 | 2019-04-21 | 國立高雄科技大學 | Pulse frequency-adjustable system |
| CN112822818A (en) * | 2019-11-15 | 2021-05-18 | 华润微集成电路(无锡)有限公司 | Circuit structure for realizing stepless dimming function |
-
2015
- 2015-12-18 CN CN201521067793.5U patent/CN205213084U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018010344A1 (en) * | 2016-07-11 | 2018-01-18 | 深圳迈睿智能科技有限公司 | Stroboflash-free led light modulation driving power supply |
| CN106658845A (en) * | 2016-12-20 | 2017-05-10 | 深圳市福瑞新科技有限公司 | Intelligent and fully compatible LED driving power supply circuit |
| CN106658845B (en) * | 2016-12-20 | 2018-07-03 | 深圳市福瑞新科技有限公司 | The full compatible with LED driving power circuit of intelligence |
| TWI657719B (en) * | 2018-04-09 | 2019-04-21 | 國立高雄科技大學 | Pulse frequency-adjustable system |
| CN112822818A (en) * | 2019-11-15 | 2021-05-18 | 华润微集成电路(无锡)有限公司 | Circuit structure for realizing stepless dimming function |
| CN112822818B (en) * | 2019-11-15 | 2023-11-10 | 华润微集成电路(无锡)有限公司 | Circuit structure for realizing electrodeless dimming function |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |