CN205726502U - A kind of LED adjusting control circuit - Google Patents

A kind of LED adjusting control circuit Download PDF

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Publication number
CN205726502U
CN205726502U CN201620118609.3U CN201620118609U CN205726502U CN 205726502 U CN205726502 U CN 205726502U CN 201620118609 U CN201620118609 U CN 201620118609U CN 205726502 U CN205726502 U CN 205726502U
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led
string
led string
constant current
current controller
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杨世红
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Shaanxi Reactor Microelectronics Co Ltd
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Shaanxi Reactor Microelectronics Co Ltd
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Abstract

LED adjusting control circuit of the present utility model, including input voltage regulation module, is used for regulating input voltage range, and exports the half sine wave voltage of periodic cycle;First LED string and the second LED string current branch adjustment module, wherein when input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED stringOr input voltage vin is more than the conduction voltage drop V of the second LED stringSecond LED stringAnd the conduction voltage drop V less than the first LED stringFirst LED stringConduction voltage drop V with the second LED stringSecond LED stringDuring sum, the first LED string and the second LED connection in series-parallel;When input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED stringConduction voltage drop V with the second LED stringSecond LED stringDuring sum, the first LED string and the series connection of the second LED string.The application adapts to wide range input, it is easy to accomplish.

Description

A kind of LED adjusting control circuit
Technical field
The utility model relates to LED technical field, and in particular, the utility model relates to a kind of LED adjusting control circuit.
Background technology
The appearance of LED, greatly reduces the electric power required for illumination, the LED of same wattage, and required electric power only has the 1/10 of incandescent lamp bulb, and LED has life-span length, environmental protection, the advantage such as non-maintaining simultaneously, replaces rapidly the position of incandescent lamp.
And as the constantly universal of LED illumination proposes increasingly higher requirement to light modulation and control technology, the problem that the dimming mode using at present is had nothing in common with each other, for example, use commercialization illumination light adjusting system, it is controlled in real time by the illuminating effect to overall region for a whole set of control system, but control mode is complicated, relatively costly, and use switch on wall mode, its dimming scope realizing is narrower, for employing remote control light modulating control mode, it needs to use signal transmission module, and complex LED power driver, realize that circuit is complex, cost is also relatively expensive.
Utility model content
In view of the above problems, this application provides the LED adjusting control circuit of a kind of part or all of solution the problems referred to above, its circuit structure is simple, it is easy to accomplish regulation, required cost is relatively low, and has High Power Factor, high efficiency feature.
In order to solve above-mentioned technical problem, the application adopts the following technical scheme that
A kind of LED adjusting control circuit, comprising:
Input voltage regulation module, is used for regulating input voltage range, and exports the half sine wave voltage of periodic cycle;
The the first LED string being connected with described input voltage regulation module and the second LED string current branch adjustment module, wherein when input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED Lamp stringOr input voltage vin is more than the conduction voltage drop V of the second LED stringSecond LED Lamp stringAnd the conduction voltage drop V less than the first LED stringFirst LED Lamp stringConduction voltage drop V with the second LED stringSecond LED Lamp stringDuring sum, described first LED string and described second LED connection in series-parallel;
When input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED Lamp stringConduction voltage drop V with the second LED stringSecond LED Lamp stringDuring sum, described first LED string and described second LED string series connection.
Alternatively, the first described LED string and the second LED string current branch adjustment module specifically include:
Corresponding the first LED string converting lamplight brightness of voltage range change exporting according to described input voltage regulation module and the second LED string;
Drive the first LED constant current controller, the second LED constant current controller and the 3rd LED constant current controller of described first LED string and described second LED string;
Change according to described input voltage regulation module output voltage range, adjust the commutation diode VD1 of described first LED string and the connection in series-parallel relation of described second LED string together with described first LED constant current controller, described second LED constant current controller and described 3rd LED constant current controller;And regulate described first LED string and sampling resistor R1, R2, R3 of described second LED string operating current size;
nullWherein,The output of described input voltage regulation module is connected with the input of described first LED string anode and described first LED constant current controller respectively,Described first LED string negative electrode is connected with the input of described second LED constant current controller,The output of described first LED constant current controller is connected with the anode of described second LED string,The negative electrode of described second LED string is connected with the B end of described second LED constant current controller,The input of described 3rd LED constant current controller is connected with the output of described second LED constant current controller,The anode of described commutation diode VD1 is connected with the negative electrode of described first LED string,The negative electrode of described commutation diode VD1 is connected with the A end of described first LED constant current controller,One end of described sampling resistor R1 is connected with the negative electrode of described commutation diode VD1,The output of the other end and the first LED constant current controller is connected,One end of described sampling resistor R2 is connected with the negative electrode of described second LED string,The other end is connected with the input of described 3rd LED constant current controller,Described sampling resistor R3 one end is connected with the C end of described 3rd LED constant current controller,The other end is connected with the output of described 3rd LED constant current controller.
Alternatively, described input voltage regulation module specifically includes:
Voltage light modulator TD and the rectifier bridge stack BR1 being connected with described voltage light modulator TD.
Alternatively, described input voltage regulation module also includes: power switch S0.
Alternatively, the resistance size of described sampling resistor R1, R2, R3 is: R1 > R2 > R3.
Alternatively, described first LED constant current controller, described second LED constant current controller are identical with the reference voltage of described 3rd LED constant current controller, and when the voltage of sampling resistor exceedes reference voltage, constant-current controller turns off.
Alternatively, described first LED string is pressure identical with lamp bead quantity with the lamp bead of described second LED string.
Alternatively, it between the output and the input of described 3rd LED constant current controller of the second LED constant current controller.
Alternatively, the lamp bead of described first LED string, described second LED string and described 3rd LED string is pressure identical with lamp bead quantity.
Alternatively, the lamp bead quantity of described first LED string, described second LED string and described 3rd LED string is three.
According to a kind of LED adjusting control circuit of the application, it includes input voltage regulation module, is used for regulating input voltage range, and exports the half sine wave voltage of periodic cycle;First LED string and the second LED string current branch adjustment module, wherein when input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED Lamp stringOr input voltage vin is more than the conduction voltage drop V of the second LED stringSecond LED Lamp stringAnd the conduction voltage drop V less than the first LED stringFirst LED Lamp stringConduction voltage drop V with the second LED stringSecond LED Lamp stringDuring sum, described first LED string and described second LED connection in series-parallel;When input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED Lamp stringConduction voltage drop V with the second LED stringSecond LED Lamp stringDuring sum, described first LED string and described second LED string series connection.The utility model can by simple regulation input voltage thus realize the regulation to LED brightness, and the LED adjusting control circuit of the application is adapted to wide range input, High Power Factor, simple in construction, easy to operate, low cost, it is easy to accomplish.
Brief description
In order to be illustrated more clearly that the utility model embodiment or technical scheme of the prior art, the accompanying drawing of required use in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments described in the utility model, for those of ordinary skill in the art, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the first specific embodiment electrical block diagram according to the utility model a kind of LED adjusting control circuit;
Fig. 2 is according to the voltage oscillogram of input voltage vin in the utility model a kind of LED adjusting control circuit and LED string current waveform figure;
Fig. 3 is the oscillogram changing with input voltage according to the power output of the utility model a kind of LED adjusting control circuit;
Fig. 4 is the electrical block diagram of the second embodiment according to the utility model a kind of LED adjusting control circuit.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole embodiments.Based on the embodiment in the utility model, every other embodiment that those of ordinary skill in the art are obtained, broadly fall into the scope of the utility model protection.
Core of the present utility model is, by an input voltage regulation module, to be used for regulating input voltage range, and export the half sine wave voltage of periodic cycle;And the first LED string and the second LED string current branch adjustment module, different connection in series-parallel current branch can be formed with input voltage change, wherein when input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED Lamp stringOr input voltage vin is more than the conduction voltage drop V of the second LED stringSecond LED Lamp stringAnd the conduction voltage drop V less than the first LED stringFirst LED Lamp stringConduction voltage drop V with the second LED stringSecond LED Lamp stringDuring sum, described first LED string and described second LED connection in series-parallel;
When input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED Lamp stringConduction voltage drop V with the second LED stringSecond LED Lamp stringDuring sum, described first LED string and described second LED string series connection.
With reference to Fig. 1, it is the first specific embodiment electrical block diagram according to the utility model a kind of LED adjusting control circuit.
In the present embodiment, LED adjusting control circuit specifically includes that
Power switch S0, voltage light modulator TD, rectifier bridge stack BR1, LED string 1 (the i.e. first LED string) and LED string 2 (the i.e. second LED string), LED constant current controller 1 (the i.e. first LED constant current controller), LED constant current controller 2 (the i.e. second LED constant current controller) and LED constant current controller 3 (the i.e. the 3rd LED constant current controller), sampling resistor R1, R2, R3 (R1 in the present embodiment > R2 > R3) and commutation diode VD1, wherein power switch S0, voltage light modulator TD form input voltage regulation module, to regulate input voltage range.
When implementing, the input of described voltage light modulator TD is connected with power supply by power switch S0, one output of voltage light modulator TD is connected with an AC input of rectifier bridge stack BR1, another output of voltage light modulator TD is connected with another AC input of rectifier bridge stack BR1, described rectifier bridge stack BR1 positive output end connects one end of LED string 1 anode and LED constant current controller 1, rectifier bridge stack BR1 negative output head grounding.nullLED string 1 negative electrode is connected with the anode of commutation diode VD1,Commutation diode VD1 negative electrode is connected with the A end of LED constant current controller 1,The negative electrode of commutation diode VD1 is connected with the other end of LED constant current controller 1 by resistance R1 simultaneously,The other end of LED constant current controller 1 is connected with the anode of LED string 2 simultaneously,The negative electrode of LED string 2 connects the B end of LED constant current controller 2,One end of LED constant current controller 2 is connected with the negative electrode of LED string 1,The other end of LED constant current controller 2 is connected with B end by resistance R2,The other end of LED constant current controller 2 is connected with one end of LED constant current controller 3 simultaneously,The other end of LED constant current controller 3 is connected with the C end of LED constant current controller 3 by resistance,The other end ground connection of LED constant current controller 3 simultaneously.
The course of work the following detailed description of the LED adjusting control circuit of the present embodiment:
Control process: combine Fig. 1, Fig. 2 and Fig. 3, in the present embodiment after power switch closes, regulates voltage light modulator TD, when input voltage vin max is more than the conduction voltage drop V of LED string 1LED Lamp string 1Or input voltage vin is more than the conduction voltage drop V of LED string 2LED Lamp string 2And the conduction voltage drop V less than LED string 1LED Lamp string 1Conduction voltage drop V with LED string 2LED Lamp string 2(V during sumLED Lamp string 1+VLED Lamp string 2<Vinmax<VLED Lamp string 1+VLED Lamp string 2When), LED string 1 and LED string 2 are bright, two LED connection in series-parallel (i.e. LED string 1 and LED string 2 is in parallel), the electric current now flowing through LED string 1 is I 1, the electric current flowing through LED string 2 is I2, waveform diagram below in the waveform of then total current I3=I1+I2=Vth2/R2, input voltage and electric current such as Fig. 2;The increase that input voltage vin max that makes regulation voltage light modulator TD continues, then the turned in parallel time of LED string increases, and LED cross luma degree is gradually increased;Regulation voltage light modulator TD, makes input voltage vin max continue to increase, when input voltage vin max is more than the conduction voltage drop V of LED string 1LED Lamp string 1Conduction voltage drop V with LED string 2LED Lamp string 2(Vinmax > V during sumLED Lamp string 1+VLED Lamp string 2) due to R1*I1 > Vth1, R2*I2 > Vth2, then LED constant current controller 1 and LED constant current controller 2 turn off, two LED string series connection (i.e. LED string 1 and LED string 2 is connected) conductings, the electric current I1 now flowing through LED the string 1 and electric current I2 flowing through LED string 2 is equal, it is equal to total current I3=Vth/R3, because I3 > I2 > I1 is brightness is higher than turned in parallel when series connection turns on, waveform diagram above in the waveform of input voltage and electric current such as Fig. 2;Regulation voltage light modulator TD makes input voltage vin max continue to subtract increase, and two LED string series connection conducting LED string ON times increase, and the brightness of two LED string series connection also increases;When regulation voltage light modulator TD makes input voltage vin max reduce, control process contrast, repeats no more here.
Fig. 3 is the corresponding relation curve of input power and input voltage, and in figure, input power rises with the trend of near linear with the increase of input voltage, it is possible to by power and the brightness of voltage-regulation LED.
Need explanation, in above-mentioned the present embodiment, regulate input voltage thus the regulation to LED brightness for the realization by simple, be adapted to High Power Factor, simple in construction, easy to operate, low cost, it is easy to accomplish.
With reference to Fig. 4, it is the second specific embodiment electrical block diagram according to the utility model a kind of LED adjusting control circuit.
In the present embodiment from add LED string 3 unlike above-mentioned first specific embodiment and improve the utilization rate of LED string and the specific embodiment of power-efficient, specifically, the LED adjusting control circuit of the present embodiment specifically includes that
Power switch S0, voltage light modulator TD, rectifier bridge stack BR1, three string LED strings: LED string 1 (the i.e. first LED string), LED string 2 (the i.e. second LED string), LED string 3 (the i.e. the 3rd LED string), three LED constant current controllers: LED constant current controller 1 (the i.e. first LED constant current controller), LED constant current controller 2 (the i.e. second LED constant current controller), LED constant current controller 3 (the i.e. the 3rd LED constant current controller), sampling resistor R1, R2, R3 and commutation diode VD1, wherein power switch S0, voltage light modulator TD forms input voltage regulation module, to regulate input voltage range.
When implementing, the input of described voltage light modulator TD is connected with power supply by power switch S0, one output of voltage light modulator TD is connected with an AC input of rectifier bridge stack BR1, another output of voltage light modulator TD is connected with another AC input of rectifier bridge stack BR1, the positive output end of described rectifier bridge stack BR1 is connected with the positive pole of electrolytic capacitor C1, and the positive output end of rectifier bridge stack BR1 is connected with the anode of LED string 1 and one end of LED constant current controller 1 simultaneously;nullThe negative electrode of described LED string 1 is connected with the anode of commutation diode VD1,Commutation diode VD1 negative electrode is connected with the A end of LED constant current controller 1,The negative electrode of commutation diode VD1 is connected with the other end of LED constant current controller 1 by resistance R1 simultaneously,The other end of LED constant current controller 1 is connected with the anode of LED string 2 simultaneously,The negative electrode of LED string 2 connects the B end of LED constant current controller 2,One end of LED constant current controller 2 is connected with the negative electrode of LED string 1,The other end of LED constant current controller 2 is connected with B end by resistance R2,The other end of LED constant current controller 2 is connected with the anode of LED string 3 simultaneously,The negative electrode of LED string 3 is connected with one end of LED constant current controller 3,The other end of LED constant current controller 3 is connected with the C end of LED constant current controller 3 by resistance R3,The other end ground connection of LED constant current controller 3 simultaneously.
The course of work the following detailed description of the LED adjusting control circuit of the present embodiment:
Control process: combine Fig. 4, in the present embodiment after power switch closes, regulates voltage light modulator TD, when input voltage vin max is more than the conduction voltage drop sum (V of LED string the 1st, LED string 3LED Lamp string 1+VLED Lamp string 3) or input voltage vin max more than the conduction voltage drop sum (V of LED string the 2nd, LED string 3LED Lamp string 2+VLED Lamp string 3) and less than (V during the conduction voltage drop sum of LED string the 1st, LED string 2 and LED string 3LED Lamp string 1+VLED Lamp string 3Or VLED Lamp string 2+VLED Lamp string 3<Vinmax<VLED Lamp string 1+VLED Lamp string 2When), LED string 1 and LED string 2 (i.e. LED string 1 and LED string 2 is in parallel) in parallel conducting, the electric current now flowing through LED string 1 is I1, the electric current flowing through LED string 2 is I2, flow through the electric current I3=I1+I2=Vth2/R2 of LED string 3, waveform diagram below in the waveform of input voltage and electric current such as Fig. 2;The increase that input voltage vin max that makes regulation voltage light modulator TD continues, then the turned in parallel time of LED string increases, and LED cross luma degree is gradually increased;Regulation voltage light modulator TD, makes input voltage vin max continue to increase, (the Vinmax > V when input voltage vin max is more than the conduction voltage drop sum of LED string the 1st, LED string 2 and LED string 3LED Lamp string 1+VLED Lamp string 2+VLED Lamp string 3) due to R1*I1 > Vth1, R2*I2 > Vth2, then LED constant current controller 1 and LED constant current controller 2 turn off, two LED string series connection (i.e. LED string 1 and LED string 2 is connected) conductings, the electric current I1 now flowing through LED the string 1 and electric current I2 flowing through LED string 2 is equal, it is equal to flow through the electric current I3=Vth/R3 of LED string 3, because I3 > I2 > I1 is brightness is higher than turned in parallel when series connection turns on, waveform diagram above in the waveform of input voltage and electric current such as Fig. 2;Input voltage vin max that makes regulation voltage light modulator TD continues to increase, and three LED string series connection conducting LED string ON times increase, and the brightness of three LED string series connection also increases;When regulation voltage light modulator TD makes input voltage vin max reduce, control process contrast, repeats no more here.
In above-mentioned provided specification, illustrate a large amount of detail.It is to be appreciated, however, that embodiment of the present utility model can be put into practice in the case of not having these details.In some instances, it is not shown specifically known method, structure and technology, in order to do not obscure the understanding of this description.
Similarly, should be understood, in order to simplify the disclosure and help to understand one or more of each utility model aspect, in the description to exemplary embodiment of the present utility model above, each feature of the present utility model is grouped together in single embodiment, figure or descriptions thereof sometimes.But, the method for the disclosure should be construed to reflect an intention that the utility model i.e. required for protection requires the more feature than the feature being expressly recited in each claim.More precisely, as the following claims reflect, utility model aspect is all features less than single embodiment disclosed above.Therefore, it then follows claims of detailed description of the invention are thus expressly incorporated in this detailed description of the invention, and wherein each claim itself is as independent embodiment of the present utility model.
It should be noted that the utility model is illustrated rather than by above-described embodiment to limit the utility model, and those skilled in the art can design alternative embodiment without departing from the scope of the appended claims.

Claims (10)

1. a LED adjusting control circuit, it is characterised in that include:
Input voltage regulation module, is used for regulating input voltage range, and exports the half sine wave voltage of periodic cycle;
The the first LED string being connected with described input voltage regulation module and the second LED string current branch adjustment module, wherein when input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED Lamp stringOr input voltage vin is more than the conduction voltage drop V of the second LED stringSecond LED Lamp stringAnd the conduction voltage drop V less than the first LED stringFirst LED Lamp stringConduction voltage drop V with the second LED stringSecond LED Lamp stringDuring sum, described first LED string and described second LED connection in series-parallel;
When input voltage vin max is more than the conduction voltage drop V of the first LED stringFirst LED Lamp stringConduction voltage drop V with the second LED stringSecond LED Lamp stringDuring sum, described first LED string and described second LED string series connection.
2. circuit according to claim 1, it is characterised in that the first described LED string and the second LED string current branch adjustment module specifically include:
Corresponding the first LED string converting lamplight brightness of voltage range change exporting according to described input voltage regulation module and the second LED string;
Drive the first LED constant current controller, the second LED constant current controller and the 3rd LED constant current controller of described first LED string and described second LED string;
Change according to described input voltage regulation module output voltage range, adjust the commutation diode VD1 of described first LED string and the connection in series-parallel relation of described second LED string together with described first LED constant current controller, described second LED constant current controller and described 3rd LED constant current controller;And regulate described first LED string and sampling resistor R1, R2, R3 of described second LED string operating current size;
nullWherein,The output of described input voltage regulation module is connected with the input of described first LED string anode and described first LED constant current controller respectively,Described first LED string negative electrode is connected with the input of described second LED constant current controller,The output of described first LED constant current controller is connected with the anode of described second LED string,The negative electrode of described second LED string is connected with the B end of described second LED constant current controller,The input of described 3rd LED constant current controller is connected with the output of described second LED constant current controller,The anode of described commutation diode VD1 is connected with the negative electrode of described first LED string,The negative electrode of described commutation diode VD1 is connected with the A end of described first LED constant current controller,One end of described sampling resistor R1 is connected with the negative electrode of described commutation diode VD1,The output of the other end and the first LED constant current controller is connected,One end of described sampling resistor R2 is connected with the negative electrode of described second LED string,The other end is connected with the input of described 3rd LED constant current controller,Described sampling resistor R3 one end is connected with the C end of described 3rd LED constant current controller,The other end is connected with the output of described 3rd LED constant current controller.
3. circuit according to claim 1, it is characterised in that described input voltage regulation module specifically includes:
Voltage light modulator TD and the rectifier bridge stack BR1 being connected with described voltage light modulator TD.
4. circuit according to claim 3, it is characterised in that described input voltage regulation module also includes: power switch S0.
5. circuit according to claim 2, it is characterised in that the resistance size of described sampling resistor R1, R2, R3 is: R1 > R2 > R3.
6. circuit according to claim 2, it is characterized in that, described first LED constant current controller, described second LED constant current controller are identical with the reference voltage of described 3rd LED constant current controller, and when the voltage of sampling resistor exceedes reference voltage, constant-current controller turns off.
7. circuit according to claim 2, it is characterised in that described first LED string is pressure identical with lamp bead quantity with the lamp bead of described second LED string.
8. circuit according to claim 7, it is characterised in that be also in series with the 3rd LED string between the output and the input of described 3rd LED constant current controller of the second LED constant current controller.
9. circuit according to claim 8, it is characterised in that the lamp bead of described first LED string, described second LED string and described 3rd LED string is pressure identical with lamp bead quantity.
10. circuit according to claim 9, it is characterised in that the lamp bead quantity of described first LED string, described second LED string and described 3rd LED string is three.
CN201620118609.3U 2016-02-06 2016-02-06 A kind of LED adjusting control circuit Active CN205726502U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107046747A (en) * 2016-02-06 2017-08-15 陕西亚成微电子股份有限公司 A kind of LED adjusting control circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107046747A (en) * 2016-02-06 2017-08-15 陕西亚成微电子股份有限公司 A kind of LED adjusting control circuit
CN107046747B (en) * 2016-02-06 2019-08-20 陕西亚成微电子股份有限公司 A kind of LED light adjusting control circuit

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