CN203827567U - Light-and-color-adjustable LED circuit - Google Patents
Light-and-color-adjustable LED circuit Download PDFInfo
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- CN203827567U CN203827567U CN201420152546.4U CN201420152546U CN203827567U CN 203827567 U CN203827567 U CN 203827567U CN 201420152546 U CN201420152546 U CN 201420152546U CN 203827567 U CN203827567 U CN 203827567U
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Abstract
The utility model discloses a light-and-color-adjustable LED circuit which comprises a rectification filter circuit, an LED light source, a constant current drive circuit and a PWM control circuit, wherein the rectification filter circuit rectifies input voltage, the LED light source comprise a high color temperature lamp string and a low color temperature lamp string, the anodes of the lamp strings being connected to the output terminal of the rectification filter circuit, the constant current drive circuit comprises first and second high-voltage linear constant-current driving chips, of which the IN pins are respectively connected to the cathodes of the lamp strings, the PWM control circuit is provided with two PWM signal outputs respectively connected with the IS pins of the first and second high-voltage linear constant-current driving chips. The two high-voltage linear constant-current driving chips drive two sets of lamp strings with different color temperature to change the duty ratio of working current of a circuit in a PWM controlled manner, thereby realizing the purpose of adjusting the light and color of the LED. The circuit is simple, the size is reduced and the cost is lowered.
Description
Technical field
The utility model relates to LED circuit technical field, relates more specifically to a kind of tunable optical toning LED circuit.
Background technology
LED a kind ofly can be converted into electric energy the semiconductor device of luminous energy, and it is different from the principle that incandescent lamp tungsten filament is luminous and electricity-saving lamp tricolor powder is luminous, but adopts electroluminescence.In modern society, because the advantage such as LED volume is little, the life-span is long, light efficiency is high, radiationless and low-power consumption makes people use more and more widely LED as the LED light fixture of light source.
The light source of different-colour can bring user different impressions, and the hobby of colour temperature is also because people determines, and light fixture need possess colour temperature regulatory function.And user is customarily used in the lamp of different brightness in the different periods, so according to the difference of client's instructions for use, light fixture need possess brightness control function.
Because the brightness of LED is almost directly proportional with its drive current, therefore adjust the method for LED forward current, adjust brightness, method is simple.Yet it is to adjust the method degree of lightening of forward current that traditional DC turns DC technology, it can produce following problem: the first also can change its spectrum and colour temperature when regulating LED brightness.Because at present white light LEDs is all excite yellow fluorescent powder and produce with blue-ray LED, when forward current reduces, the thickness of blue-ray LED brightness minimizing and yellow fluorescent powder is attenuate in proportion not, thereby the dominant wavelength of its spectrum is increased, and causes colour temperature to change; It two is, because VF value and the electric current of LED are proportional, when LED electric current reduces to very little, it is very little that LEDVF value can become, even lower than the input voltage of booster driving circuit, cause booster driving circuit do not work or cause step-down drive circuit pressure reduction excessive and work undesired.In addition, what traditional light regulating technology adopted is that DC in parallel turns DC modulated luminance and colour temperature respectively, and it is complicated that two-stage DC turns DC circuit structure, and volume is large and cost is high.
Given this, be necessary to provide a kind of simple in structure, cost is lower, the tunable optical toning LED circuit of high efficiency and small size to be to address the aforementioned drawbacks.
Utility model content
Technical problem to be solved in the utility model be to provide a kind of simple in structure, cost is lower, the tunable optical of high efficiency and small size toning LED circuit to be to address the deficiencies of the prior art.
In order to solve the problems of the technologies described above, the utility model provides a kind of tunable optical toning LED circuit, and this tunable optical toning LED circuit comprises current rectifying and wave filtering circuit, LED light source, constant-current drive circuit and pwm control circuit.Wherein, described current rectifying and wave filtering circuit is used for connecting power supply so that input voltage is carried out to rectification; Described LED light source comprises high color temperature lamp string and low color temperature lamp string, and the anode of two lamp strings is all connected in the output of current rectifying and wave filtering circuit; Described constant-current drive circuit comprises the first high-voltage linear constant-current driven chip and the second high-voltage linear constant-current driven chip, each high-voltage linear constant-current driven chip is provided with IS pin for input control signal, for the IN pin as input and for the GND pin of ground connection, the IN pin of the IN pin of described the first high-voltage linear constant-current driven chip and the second high-voltage linear constant-current driven chip is connected to the negative electrode of described high color temperature lamp string and the negative electrode of low color temperature lamp string; Described pwm control circuit is provided with the output of two-way pwm signal, and this two-way output is connected to the IS pin of described the first high-voltage linear constant-current driven chip and the IS pin of the second high-voltage linear constant-current driven chip.
Preferably, described current rectifying and wave filtering circuit includes rectifier bridge stack, electrochemical capacitor and resistance, and the input of rectifier bridge stack is used for connecting power supply, its output one end ground connection, the other end is connected in the anode of two lamp strings, and described electrochemical capacitor and resistance are all connected in parallel on the output of rectifier bridge stack.
Preferably, described current rectifying and wave filtering circuit also includes piezo-resistance, and described piezo-resistance is connected in parallel on the output of rectifier bridge stack.
Preferably, all to select model be that the driving chip of PT6913 is realized for described the first high-voltage linear constant-current driven chip and the second high-voltage linear constant-current driven chip.
Compared with prior art, the utlity model has following beneficial effect: the utility model adopts pwm control circuit to be used as pulsed constant current supply with coordinating of high-voltage linear constant-current driven chip, by adjusting pulse duration, can change the brightness of LED lamp string, thereby realize light modulation toning.In this light modulation toning process, electric current does not change, thereby has avoided the variation of spectral wavelength, and has avoided chromatogram skew.The more important thing is, the utility model adopts simple device can realize building of high voltage and constant current circuit, and it is simple in structure, and cost is lower, efficiency is high and can realize volume miniaturization, for realizing the small size product Wireless Light modulatings such as GU10LED lamp, candle lamp, provides basis.
By following description also by reference to the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used for explaining embodiment of the present utility model.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model tunable optical toning LED circuit one embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in embodiment is clearly and completely described, in accompanying drawing, similarly assembly label represents similar assembly.Obviously, below by the embodiment of description, be only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
With reference to Fig. 1, the tunable optical of the present embodiment toning LED circuit 10 comprises that tunable optical toning LED circuit comprises current rectifying and wave filtering circuit 11, LED light source 12, constant-current drive circuit 13 and pwm control circuit 14.
Wherein, current rectifying and wave filtering circuit 11 is for carrying out rectification to the input voltage of power supply, in certain embodiments, this current rectifying and wave filtering circuit 11 includes rectifier bridge stack BD1, electrochemical capacitor C1 and resistance R 5, and the input of rectifier bridge stack BD1 is used for connecting power supply, its output one end ground connection, the other end is connected in the input of LED light source 12, described electrochemical capacitor C1 and resistance R 5 are all connected in parallel on the output of rectifier bridge stack BD1, and wherein resistance R 5 is as dummy load, and electrochemical capacitor C1 provide filter action.Prevented too high the burning out of circuit voltage and affected incoming line, in certain embodiments, the output of rectifier bridge stack BD1 is also parallel with a piezo-resistance RV1, thereby in circuit, plays short-circuit protection effect.
LED light source 12 comprises high color temperature lamp string 121 and low color temperature lamp string 122, each lamp string is in series by a plurality of LED lamps, the anode of high color temperature lamp string 121 and low color temperature lamp string 122 is all connected in the output of current rectifying and wave filtering circuit, and its negative electrode is connected in constant-current drive circuit 13.
Constant-current drive circuit 13 comprises the first high-voltage linear constant-current driven chip U1A and the second high-voltage linear constant-current driven chip U1B.And pwm control circuit 14 is provided with two-way pwm signal output PWM1 and PWM2, this two-way output is respectively used to control the first high-voltage linear constant-current driven chip U1A and the second high-voltage linear constant-current driven chip U1B.
Particularly, the first high-voltage linear constant-current driven chip U1A and the second high-voltage linear constant-current driven chip U1B are provided with three pins, are respectively IS pin for input control signal, for the IN pin as input and for the GND pin of ground connection.Wherein, for the first high-voltage linear constant-current driven chip U1A, its IN pin is connected with the negative electrode output of high color temperature lamp string 121, and its IS pin is connected with pwm control circuit 14 mono-tunnel output PWM1, its GND pin ground connection; Similarly, for the second high-voltage linear constant-current driven chip U1B, its IN pin is connected with the negative electrode output of low color temperature lamp string 122, and its IS pin is connected with another road output PWM2 of pwm control circuit 14, its GND pin ground connection.
In certain embodiments, it is that the driving chip of PT6913 is realized that described the first high-voltage linear constant-current driven chip U1A and the second high-voltage linear constant-current driven chip U1B all select model, understandably, in other embodiments, also can select other chip that there is equal framework with PT6913 chip to realize.PT6913 is a special linear constant-current driven chip, is applicable to drive the little electric current LED of high voltage load.PT6913 adopts linear constant current to control output current, inner integrated power MOS, and output current can be set as 10mA～60mA by non-essential resistance.PT6913 maximum input voltage can reach 400V, adopts high-side driver mode, and LED open circuit, LED short-circuit protection are provided.Under any circumstance, the unnecessary voltage that input power exceeds LED load is all born by PT6913, and LED load can not face overvoltage and threaten.These characteristics based on PT6913, the utility model is selected PT6913 to form constant-current drive circuit 13 and can be made circuit working at high voltage and constant current state, remove DC from and turn the complicated circuit constructions such as DC.
The operation principle of the utility model tunable optical toning once of simple declaration below LED circuit.
Based on foregoing circuit design, when circuit input voltage is AC220V, after rectifying and wave-filtering, still for follow-up LED light source 12 provides stable and higher than the high voltage of LED, LED load circuit is normally worked like this.Pwm control circuit 14 provides pulse control signal for constant-current drive circuit 13, and constant-current drive circuit 13 orders about LED light source as pulsed constant current supply and is operated in constant current state.Adjust the duty ratio of pwm control circuit 14 output signals, utilize PWM1 and PWM2 two paths of signals to control the through and off of high-voltage linear constant-current driven chip U1A, U1B output current, thereby further adjust having or nothing of high color temperature LED lamp string and low colour temperature LED lamp string stream, thereby control the operating time length of two groups of LED lamp strings, realize light modulation toning, it can be realized and be low to moderate 2000K and regulate (specifically can select and the concrete control of pwm control circuit 14 realize different reference color temperature adjustings according to the colour temperature of two lamp strings) up to the reference color temperature of 7000K.
As mentioned above, the utility model adopts pwm control circuit to be used as pulsed constant current supply with coordinating of high-voltage linear constant-current driven chip, by adjusting pulse duration, can change the brightness of LED lamp string, thereby realizes light modulation toning.In this light modulation toning process, electric current does not change, thereby has avoided the variation of spectral wavelength, and has avoided chromatogram skew.The more important thing is, the utility model adopts simple device can realize building of high voltage and constant current circuit, and it is simple in structure, and cost is lower, and can realize volume miniaturization, for realizing the small size product Wireless Light modulatings such as GU10LED lamp, candle lamp, provides basis.
Above combination most preferred embodiment is described the utility model, but the utility model is not limited to the embodiment of above announcement, and should contain the various modifications of carrying out according to essence of the present utility model, equivalent combinations.
Claims (4)
1. a tunable optical toning LED circuit, is characterized in that: comprise current rectifying and wave filtering circuit, LED light source, constant-current drive circuit and pwm control circuit, wherein,
Described current rectifying and wave filtering circuit is used for connecting power supply so that input voltage is carried out to rectification;
Described LED light source comprises high color temperature lamp string and low color temperature lamp string, and the anode of two lamp strings is all connected in the output of current rectifying and wave filtering circuit;
Described constant-current drive circuit comprises the first high-voltage linear constant-current driven chip and the second high-voltage linear constant-current driven chip, each high-voltage linear constant-current driven chip is provided with IS pin for input control signal, for the IN pin as input and for the GND pin of ground connection, the IN pin of the IN pin of described the first high-voltage linear constant-current driven chip and the second high-voltage linear constant-current driven chip is connected to the negative electrode of described high color temperature lamp string and the negative electrode of low color temperature lamp string;
Described pwm control circuit is provided with the output of two-way pwm signal, and this two-way output is connected to the IS pin of described the first high-voltage linear constant-current driven chip and the IS pin of the second high-voltage linear constant-current driven chip.
2. tunable optical as claimed in claim 1 toning LED circuit, it is characterized in that: described current rectifying and wave filtering circuit includes rectifier bridge stack, electrochemical capacitor and resistance, the input of rectifier bridge stack is used for connecting power supply, its output one end ground connection, the other end is connected in the anode of two lamp strings, and described electrochemical capacitor and resistance are all connected in parallel on the output of rectifier bridge stack.
3. tunable optical toning LED circuit as claimed in claim 2, is characterized in that: described current rectifying and wave filtering circuit also includes piezo-resistance, and described piezo-resistance is connected in parallel on the output of rectifier bridge stack.
4. tunable optical as claimed in claim 1 toning LED circuit, is characterized in that: it is that the driving chip of PT6913 is realized that described the first high-voltage linear constant-current driven chip and the second high-voltage linear constant-current driven chip are all selected model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420152546.4U CN203827567U (en) | 2014-03-31 | 2014-03-31 | Light-and-color-adjustable LED circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420152546.4U CN203827567U (en) | 2014-03-31 | 2014-03-31 | Light-and-color-adjustable LED circuit |
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| CN203827567U true CN203827567U (en) | 2014-09-10 |
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| CN201420152546.4U Expired - Fee Related CN203827567U (en) | 2014-03-31 | 2014-03-31 | Light-and-color-adjustable LED circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929851A (en) * | 2014-03-31 | 2014-07-16 | 深圳市九洲光电科技有限公司 | LED circuit with dimming function and color matching function |
| CN108696967A (en) * | 2018-06-04 | 2018-10-23 | 浙江阳光美加照明有限公司 | A kind of light modulation toning driving circuit of LED light |
-
2014
- 2014-03-31 CN CN201420152546.4U patent/CN203827567U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929851A (en) * | 2014-03-31 | 2014-07-16 | 深圳市九洲光电科技有限公司 | LED circuit with dimming function and color matching function |
| CN108696967A (en) * | 2018-06-04 | 2018-10-23 | 浙江阳光美加照明有限公司 | A kind of light modulation toning driving circuit of LED light |
| CN108696967B (en) * | 2018-06-04 | 2023-11-10 | 浙江阳光美加照明有限公司 | Dimming and toning driving circuit of LED lamp |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20180331 |