CN105636302A - LED light modulation device - Google Patents
LED light modulation device Download PDFInfo
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- CN105636302A CN105636302A CN201410607239.5A CN201410607239A CN105636302A CN 105636302 A CN105636302 A CN 105636302A CN 201410607239 A CN201410607239 A CN 201410607239A CN 105636302 A CN105636302 A CN 105636302A
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Abstract
The invention relates to an LED light modulation device, wherein the LED light modulation device comprises a light modulation signal generation module, a frequency modulation module and an LED driving module. An output end of the light modulation signal generation module is connected with an input end of the frequency modulation module. An output end of the frequency modulation module is connected with an input end of the LED driving module. The frequency modulation module comprises a first current source (U1), a first switch (S1), a second current source (U2), a second switch (S2), a capacitor (C) and a comparator (COMP). The light modulation signal generation module is an adjustable resistor (R). By adjusting the resistance of the adjustable resistor, the working frequency of the circuit is modulated, the duty ratio of a switch tube in the LED driving module is changed, and LED light modulation is finally realized; in addition, the circuit structure is simple, the working frequency is not increased by the reduced peak current, the loss of the switch tube in the LED driving module is lowered, the working is stable, and the cost is low.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to circuit design, specifically refer to a kind of LED light modulating device.
Background technology
Energy-conservation is one of the most prominent for LED advantage, if introducing the power savings advantages of the performance LED illumination that light regulating technology can be bigger in general lighting. The linear light modulation of light regulating technology, PWM light modulation and the controllable silicon light modulation etc. commonly used at present, wherein linearity light adjusting circuit is fairly simple, it is that the peak point current changing inductance by changing voltage or resistance changes LED drive current, shortcoming is that peak point current diminishes and can increase the operating frequency of drive circuit, increase switching loss, white light while reducing LED current, can be caused simultaneously to offset to yellow spectrum. And light modulation cost that in existing light regulating technology, controllable silicon light modulation and MCU control is all higher, fairly simple is by changing voltage or resistance changes the peak point current of inductance and changes LED drive current.
Referring to shown in Fig. 1, non-isolated LED drives work wave, and switching tube turns on, and inductive current is started from scratch risings, and switching tube shutoff, inductive current begins to decline from peak value, a duty cycle time T=TON+TOFF��IPK, the operating frequency of circuit is multiplied with the reduction of peak point current, and white light can be caused while reducing LED current to offset to yellow spectrum.
Summary of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, it is provided that a kind of can by regulating variable-resistance resistance value the operating frequency of circuit being modulated, the dutycycle of switching tube ON time that changes in LED drive module, circuit structure are simple, peak point current reduces will not increase operating frequency, the switching tube loss that reduces in LED drive module, working stability, LED light modulating device that cost is low.
To achieve these goals, the LED light modulating device of the present invention has following composition:
This LED light modulating device, it is mainly characterized by, and described device includes dim signal generation module, frequency modulation(PFM) module and LED drive module; The outfan of described dim signal generation module is connected with the input of described frequency modulation(PFM) module, and the outfan of described frequency modulation(PFM) module is connected with the input of described LED drive module.
Further, described dim signal generation module is adjustable resistance (R).
Further, described frequency modulation(PFM) module includes the first current source (U1) and the first switch (S1), the second current source (U2) and second switch (S2), electric capacity (C) and comparator (COMP); The outfan of described the first current source (U1) is connected with the described first the first end switching (S1), the outfan of described the second current source (U2) is connected with the first end of described second switch (S2), and the input of the first described current source and the input of the second current source are connected with described adjustable resistance (R) respectively; Described first switch second end of (S1), the second end of described second switch (S2), described electric capacity (C) the first end be connected and the positive input of described comparator (COMP) is connected, second end of described electric capacity (C) is connected to the ground and connects, and the described outfan of comparator (COMP) is connected with the input of described LED drive module.
Yet further, described the first current source (U1) and the second current source (U2) are controlled current source.
Yet further, the first described switch (S1) and second switch (S2) are HF switch.
Further, described LED drive module is work in the changer of high frequency switch-mode.
Further, described light modulating device also includes power module and LED module, and the outfan of described LED drive module is connected with LED module, and described power module is connected with described LED drive module.
Have employed the LED light modulating device in this invention, compared with prior art, have the advantages that
The LED light modulating device of the present invention, is modulated by regulating the variable-resistance resistance value operating frequency to circuit, changes the dutycycle of LED drive module breaker in middle pipe ON time, and LED is dimmed by final realization; The LED light modulating device of the present invention, circuit structure is simple, and peak point current reduces will not increase operating frequency, reduces the loss of LED drive module breaker in middle pipe, working stability, and cost is low.
Accompanying drawing explanation
Fig. 1 is the oscillogram of LED light modulating device of the prior art.
Fig. 2 is the LED light modulating device structural representation of the present invention.
Fig. 3 is the circuit diagram of the LED light modulating device of the present invention.
Fig. 4 is the oscillogram of the non-isolated LED drive circuit of the present invention.
Fig. 5 is the oscillogram of the isolation LED drive circuit of the present invention.
Detailed description of the invention
In order to more clearly describe the technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
Referring to shown in Fig. 2 to Fig. 5, the LED light modulating device of the present invention is based on light adjusting circuit and the implementation of PFM pattern.
Referring to shown in Fig. 2, the LED light modulating device of the present invention includes dim signal generation module, frequency modulation(PFM) module and LED drive module; The outfan of described dim signal generation module is connected with the input of described frequency modulation(PFM) module, and the outfan of described frequency modulation(PFM) module is connected with the input of described LED drive module.LogicalOverregulate variable resistanceRResistance value the operating frequency of circuit is modulated, increase LED drive module breaker in middle pipe opening time and change the dutycycle of switching tube ON time, LED is dimmed by final realization.
Wherein, described dim signal generation module is adjustable resistance R.
Referring to shown in Fig. 3, described frequency modulation(PFM) module includes the first current source U1 and the first switch S1, the second current source U2 and second switch S2, electric capacity C and comparator COMP; The outfan of the first described current source U1 is connected with the described first the first end switching S1, the outfan of the second described current source U2 is connected with first end of described second switch S2, and the input of the first described current source and the input of the second current source are connected with described adjustable resistance R respectively; Described first switch second end of S1, second end of described second switch S2, described electric capacity C the first end be connected and the positive input of described comparator COMP is connected, second end of described electric capacity C is connected to the ground and connects, and the outfan of described comparator COMP is connected with the input of described LED drive module.
Wherein, the first described current source U1 and the second current source U2 is controlled current source. The first described switch S1 and second switch S2 is HF switch.
Adjustable resistance R is for changing the first current source U1 and the size of the second current source U2, and the first switch S1 Guan Bi, electric capacity C is charged by I1, and the first switch S1 opens, and second switch S2 closes, and electric capacity C is discharged by I2. The electric capacity C discharge and recharge time is relevant with the size of I1, I2, controls, by the electric capacity C discharge and recharge time, the switching tube opening time increased in LED drive module and changes the dutycycle of switching tube ON time.
Described LED drive module is work in the changer of high frequency switch-mode. Described light modulating device also includes power module and LED module, and the outfan of described LED drive module is connected with LED module, and described power module is connected with described LED drive module.
Refer to Fig. 3 and in conjunction with shown in Fig. 4, for the oscillogram that the non-isolated LED drive circuit of the present invention dims based on PFM pattern, wherein, uncomfortable smooth time work without frequency modulation(PFM) module, LED current IL=IPK/ 2, IPKFor inductance peak point current. When needing to dim, LED drive module is controlled by frequency modulation module, uncomfortable smooth time circuit a working cycle be t1, within the t1 time, electric capacity C charges, and the t1 time terminates, and electric capacity C discharges, by adjustable resistance, I2=I1/N is set, discharge time t2=Nt1, LED drive module controls the switching tube in LED drive module and enters next cycle, I after inductive current is reduced to 0 after the time delay t2 timeL=IPK/2(1+N)��
Refer to Fig. 3 and in conjunction with shown in Fig. 5, for the oscillogram that the isolation LED drive circuit of the present invention dims based on PFM pattern, wherein, first switch S1 Guan Bi, electric capacity C is charged by I1, VC > VREF, LED drive module controls the switching tube Guan Bi in LED drive module, main coil current IPRising, reach peak point current, switching tube is opened, and the first switch S1 opens, and second switch S2 closes, and electric capacity C is discharged by I2, auxiliary winding electric current ISStart to reduce (ISKPeak point current for auxiliary winding), when being reduced to 0, the first switch S1 Guan Bi, second switch S2 opens, and electric capacity C electric discharge terminates, and discharge time is that t2, I1 are recharged to electric capacity C, and VC > VREF, switching tube is again turned on, IPAgain reaching peak point current, when switching tube turns off, electric capacity C charging terminates, and the charging interval is t1.
First current source U1 is regulated by adjustable resistance R can obtain I1=I2/N, t1=Nt2, ILED=ISK/ 2 (1+N), are not light-modulating mode during N=1.
Have employed the LED light modulating device in this invention, compared with prior art, have the advantages that
The LED light modulating device of the present invention, is modulated by regulating the variable-resistance resistance value operating frequency to circuit, changes the dutycycle of LED drive module breaker in middle pipe ON time, and LED is dimmed by final realization; The LED light modulating device of the present invention, circuit structure is simple, and peak point current reduces will not increase operating frequency, reduces the loss of LED drive module breaker in middle pipe, working stability, and cost is low.
In this description, the present invention is described with reference to its specific embodiment. But it is clear that still may be made that various amendment and conversion are without departing from the spirit and scope of the present invention. Therefore, specification and drawings is regarded in an illustrative, rather than a restrictive.
Claims (7)
1. a LED light modulating device, it is characterised in that described device includes dim signal generation module, frequency modulation(PFM) module and LED drive module; The outfan of described dim signal generation module is connected with the input of described frequency modulation(PFM) module, and the outfan of described frequency modulation(PFM) module is connected with the input of described LED drive module.
2. LED light modulating device according to claim 1, it is characterised in that described dim signal generation module is adjustable resistance (R).
3. LED light modulating device according to claim 2, it is characterized in that, described frequency modulation(PFM) module includes the first current source (U1) and the first switch (S1), the second current source (U2) and second switch (S2), electric capacity (C) and comparator (COMP); The outfan of described the first current source (U1) is connected with the described first the first end switching (S1), the outfan of described the second current source (U2) is connected with the first end of described second switch (S2), and the input of the first described current source and the input of the second current source are connected with described adjustable resistance (R) respectively; Described first switch second end of (S1), the second end of described second switch (S2), described electric capacity (C) the first end be connected and the positive input of described comparator (COMP) is connected, second end of described electric capacity (C) is connected to the ground and connects, and the described outfan of comparator (COMP) is connected with the input of described LED drive module.
4. LED light modulating device according to claim 3, it is characterised in that described the first current source (U1) and the second current source (U2) are controlled current source.
5. LED light modulating device according to claim 3, it is characterised in that the first described switch (S1) and second switch (S2) are HF switch.
6. LED light modulating device according to claim 1, it is characterised in that described LED drive module is work in the changer of high frequency switch-mode.
7. LED light modulating device according to claim 1, it is characterized in that, described light modulating device also includes power module and LED module, and the outfan of described LED drive module is connected with LED module, and described power module is connected with described LED drive module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410607239.5A CN105636302B (en) | 2014-10-31 | 2014-10-31 | LED dimming device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410607239.5A CN105636302B (en) | 2014-10-31 | 2014-10-31 | LED dimming device |
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| CN105636302A true CN105636302A (en) | 2016-06-01 |
| CN105636302B CN105636302B (en) | 2018-11-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112822817A (en) * | 2019-11-15 | 2021-05-18 | 华润微集成电路(无锡)有限公司 | Drive control circuit structure for realizing dimming function |
| 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 |
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| CN101436859A (en) * | 2007-11-16 | 2009-05-20 | 安凡微电子(上海)有限公司 | Rapidly-locked frequency generator |
| CN102024426A (en) * | 2009-09-14 | 2011-04-20 | 三星电机株式会社 | Reference signal generator and PWM control circuit for LCD backlight |
| CN103296894A (en) * | 2013-05-21 | 2013-09-11 | 辉芒微电子（深圳）有限公司 | Controllable constant-current output circuit |
| CN103337943A (en) * | 2013-07-02 | 2013-10-02 | 上海新进半导体制造有限公司 | Conducting time generating circuit, method, as well as control circuit and switching power supply employing same |
| CN103427656A (en) * | 2013-07-11 | 2013-12-04 | 江苏大学 | Staggered parallel flyback LED driving power supply and PFM (pulse width modulation) control circuit thereof |
| CN204090257U (en) * | 2014-10-31 | 2015-01-07 | 无锡华润矽科微电子有限公司 | LED light modulating device |
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2014
- 2014-10-31 CN CN201410607239.5A patent/CN105636302B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101436859A (en) * | 2007-11-16 | 2009-05-20 | 安凡微电子(上海)有限公司 | Rapidly-locked frequency generator |
| CN102024426A (en) * | 2009-09-14 | 2011-04-20 | 三星电机株式会社 | Reference signal generator and PWM control circuit for LCD backlight |
| CN103296894A (en) * | 2013-05-21 | 2013-09-11 | 辉芒微电子（深圳）有限公司 | Controllable constant-current output circuit |
| CN103337943A (en) * | 2013-07-02 | 2013-10-02 | 上海新进半导体制造有限公司 | Conducting time generating circuit, method, as well as control circuit and switching power supply employing same |
| CN103427656A (en) * | 2013-07-11 | 2013-12-04 | 江苏大学 | Staggered parallel flyback LED driving power supply and PFM (pulse width modulation) control circuit thereof |
| CN204090257U (en) * | 2014-10-31 | 2015-01-07 | 无锡华润矽科微电子有限公司 | LED light modulating device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112822817A (en) * | 2019-11-15 | 2021-05-18 | 华润微集成电路(无锡)有限公司 | Drive control circuit structure for realizing dimming function |
| 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 |
| CN112822817B (en) * | 2019-11-15 | 2022-10-18 | 华润微集成电路(无锡)有限公司 | Drive control circuit structure for realizing 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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| CN105636302B (en) | 2018-11-27 |
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Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Patentee after: China Resources micro integrated circuit (Wuxi) Co., Ltd Address before: No.180-22, Linghu Avenue, Taihu International Science and Technology Park, Wuxi, Jiangsu 214135 Patentee before: WUXI CHINA RESOURCES SEMICO Co.,Ltd. |
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