CN102612213A - LED (light emitting diode) drive circuit structure with adjustable constant-voltage and constant-current mode - Google Patents
LED (light emitting diode) drive circuit structure with adjustable constant-voltage and constant-current mode Download PDFInfo
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- CN102612213A CN102612213A CN2012100430068A CN201210043006A CN102612213A CN 102612213 A CN102612213 A CN 102612213A CN 2012100430068 A CN2012100430068 A CN 2012100430068A CN 201210043006 A CN201210043006 A CN 201210043006A CN 102612213 A CN102612213 A CN 102612213A
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Abstract
The invention discloses an LED drive circuit structure with an adjustable constant-voltage and constant-current mode. The LED drive circuit structure comprises a constant voltage module, a constant current module, a combined switch module and an output module, wherein a constant current output tube and a constant voltage output tube are multiplexed during output of the constant voltage module; and the constant current mode has a simplified and specific voltage and current conversion manner. According to the above two kinds of circuit design, the structure of an LED output drive end can be simplified effectively, the system application flexibility can be enhanced, and the system cost can be lowered effectively.
Description
Technical field
The hardware that the invention belongs to integrated circuit (Integrated Circuit) is realized, relates in particular to the adjustable led drive circuit structure of a kind of constant pressure and flow pattern.
Background technology
LED is a kind of display device of function admirable; Have life-span length, economize on electricity, high brightness, multiple glow color, advantage such as response speed is fast and driving voltage is low; When saving the energy, can also regulate the LED luminous intensity through the PWM device; Access multiple color according to R, G, B three primary colors mixed light principle, realize multiple display effect through circuit control again.The existing fields such as city lighting, construction landscape illumination, light of stage design that just are being widely used in.
Because different application conditions, the driving of LED is divided into constant voltage and two kinds of patterns of constant current.Constant voltage mode is that the grid at driving tube adds fixing voltage drive, and constant current mode is to add suitable biasing to make the load current on the driving tube keep invariable.In practical application, two kinds of different drive circuits of the general employing of pattern are realized.And some circuit that have two kinds of patterns concurrently have complex structure, use loaded down with trivial detailsly, and cost is crossed high shortcoming.
Seeing that product application flexibility and system cost are considered: a kind of simple in structure, the conversion regime adjustable LED Drive Structure of constant pressure and flow pattern flexibly just becomes a kind of demand.
Summary of the invention
The object of the present invention is to provide a kind of simple in structurely, conversion regime is the adjustable led drive circuit structure of constant pressure and flow pattern flexibly.
Technical scheme of the present invention is following:
The led drive circuit structure that a kind of constant pressure and flow pattern is adjustable comprises following functional module:
A. constant flow module: comprise constant-current source, current-to-voltage convertor and constant current resistance; Said constant-current source mirror image reference current, said current-to-voltage convertor converts reference current into reference voltage, and said constant current resistance converts reference voltage to constant current, is exported by the constant current efferent duct at last;
B. constant voltage module: comprise input buffer; Said input buffer oppositely cushions output to input signal, is exported jointly by constant current efferent duct, constant voltage efferent duct then;
C. unit switch module: comprise mode selector switch and unit switch, switch, form constant voltage and the adjustable output of constant current mode through two groups of switch combinations;
D. output module: comprise constant current efferent duct and constant voltage efferent duct; Form output by said constant current efferent duct under the constant current mode; Constant voltage mode forms output jointly by said constant current efferent duct and said constant voltage efferent duct.
Its further technical scheme is: particular circuit configurations comprises mode selector switch, input buffering pipe, current source, unit switch, current/voltage crossover connection, resistance, constant current resistance, constant current efferent duct and constant voltage efferent duct; Said mode selector switch is the PMOS pipe, and its grid is connected as the input of mode switching signal and with the control end of unit switch, and its drain electrode is in series with the input buffering pipe; Said input buffering pipe is the gun stocks that is composed in series by PMOS pipe and NMOS pipe, and its input is as signal input part, and its output is connected with the first input end of unit switch; Said current source is the PMOS pipe, and its grid is as the reference signal input, and its drain electrode is connected with the first input end of unit switch; Second input end grounding of said unit switch; Said current/voltage crossover connection is the NMOS pipe, and its drain electrode is connected with the drain electrode of current source, ground connection behind its grid series connection resistance and the constant current resistance; Said constant current efferent duct and constant voltage efferent duct are the NMOS pipe, both parallel connections, and an end of parallel connection is connected with the common ends of resistance with constant current resistance, and the other end of parallel connection is as the output of entire circuit; The grid of said constant current efferent duct is connected with the output of unit switch, and the grid of said constant voltage efferent duct is connected with the output of input buffering pipe.
And; Its further technical scheme is: the transmission gate that said unit switch is made up of inverter and a pair of NMOS pipe; Its control end is connected with the grid of mode selector switch; Its first input end is connected with the output of input buffering pipe, its second input end grounding, and its output is connected with the grid of constant current efferent duct.
Useful technique effect of the present invention is:
The present invention proposes the concrete way of realization of the adjustable led drive circuit of a kind of constant pressure and flow pattern, adopt a kind of constant current structure of simplification and combine traditional constant voltage mode to form the adjustable LED Drive Structure of a kind of two kinds of patterns jointly through unit switch.The present invention can simplify the structure of LED output drive end effectively, increases the flexibility of system applies, and can effectively reduce the cost of system.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is a line map of the present invention.
Fig. 3 is the line map of unit switch MUX1.
Embodiment
Further specify below in conjunction with the accompanying drawing specific embodiments of the invention.
As shown in Figure 1, the present invention is made up of constant flow module A, constant voltage module B, unit switch module C, output module D jointly, and unit switch C can select constant flow module A or constant voltage module B according to mode state, at last through output module D output.
As shown in Figure 2, hardware logic of the present invention is by mode selector switch P1, input buffering pipe P2, N2, current source P3; Unit switch MUX1, current/voltage crossover connection N3, resistance R1; Constant current resistance R2, constant current efferent duct N4, components and parts such as constant voltage efferent duct N5 are formed.
Under constant voltage mode; Mode switching signal MODE is 0, mode selector switch P1 conducting, and input signal DIN gets into the A end of unit switch MUX1 after input buffering pipe P2, N2 swing to; This moment, mode switching signal acted on unit switch MUX1; Side a and b is linked to each other, and input signal DIN is carried in the grid of constant current efferent duct N4 and constant voltage efferent duct N5 simultaneously, and constant current efferent duct N4 and constant voltage efferent duct N5 open Lou output.
Under constant current mode, mode switching signal MODE is 1, and mode selector switch P1 closes, the B end ground connection of unit switch MUX1, and constant current efferent duct N4 pipe is closed.Under input signal DIN effective status; Current source P3 has constant electric current I 1 to flow through current/voltage crossover connection N3, induces constant voltage V1 at the grid (D point) of current/voltage crossover connection N3, because no current flows through on the grid of current/voltage crossover connection N3; Resistance R1 voltage equates; Constant voltage V1 forms constant current I2 through constant current resistance R2, and constant current is exported through constant current efferent duct N5.
Under constant current mode, the constant current of current source P3 has band gap reference to produce, and not influenced by supply voltage, and final constant current value is: I2=V1/R2.
Above-described only is preferred implementation of the present invention, the invention is not restricted to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from basic design of the present invention, all should think to be included within protection scope of the present invention.
Claims (3)
1. led drive circuit structure that the constant pressure and flow pattern is adjustable is characterized in that comprising following functional module:
A. constant flow module: comprise constant-current source, current-to-voltage convertor and constant current resistance; Said constant-current source mirror image reference current, said current-to-voltage convertor converts reference current into reference voltage, and said constant current resistance converts reference voltage to constant current, is exported by the constant current efferent duct at last;
B. constant voltage module: comprise input buffer; Said input buffer oppositely cushions output to input signal, is exported jointly by constant current efferent duct, constant voltage efferent duct then;
C. unit switch module: comprise mode selector switch and unit switch, switch, form constant voltage and the adjustable output of constant current mode through two groups of switch combinations;
D. output module: comprise constant current efferent duct and constant voltage efferent duct; Form output by said constant current efferent duct under the constant current mode; Constant voltage mode forms output jointly by said constant current efferent duct and said constant voltage efferent duct.
2. according to the adjustable led drive circuit structure of the said constant pressure and flow pattern of claim 1, it is characterized in that particular circuit configurations is following: comprise mode selector switch (P1), input buffering pipe (P2, N2), current source (P3), unit switch (MUX1), current/voltage crossover connection (N3), resistance (R1), constant current resistance (R2), constant current efferent duct (N4) and constant voltage efferent duct (N5);
Said mode selector switch (P1) is the PMOS pipe, and its grid is connected as the input of mode switching signal and with the control end of unit switch (MUX1), and its drain electrode is in series with input buffering pipe (P2, N2); Said input buffering pipe (P2, N2) is the gun stocks that is composed in series by PMOS pipe and NMOS pipe, and its input is as signal input part, and its output is connected with the first input end of unit switch (MUX1); Said current source (P3) is the PMOS pipe, and its grid is as the reference signal input, and its drain electrode is connected with the first input end of unit switch (MUX1); Second input end grounding of said unit switch (MUX1); Said current/voltage crossover connection (N3) is the NMOS pipe, and its drain electrode is connected with the drain electrode of current source (P3), its grid series connection resistance (R1) and constant current resistance (R2) back ground connection; Said constant current efferent duct (N4) and constant voltage efferent duct (N5) are the NMOS pipe, both parallel connections, and an end of parallel connection is connected with the common ends of resistance (R1) with constant current resistance (R2), and the other end of parallel connection is as the output of entire circuit; The grid of said constant current efferent duct (N4) is connected with the output of unit switch (MUX1), and the grid of said constant voltage efferent duct (N5) is connected with the output of input buffering pipe (P2, N2).
3. according to the adjustable led drive circuit structure of the said constant pressure and flow pattern of claim 2; It is characterized in that: the transmission gate that said unit switch (MUX1) is made up of inverter and a pair of NMOS pipe; Its control end is connected with the grid of mode selector switch (P1); Its first input end (A) is connected with the output of input buffering pipe (P2, N2), its second input (C) ground connection, and its output (B) is connected with the grid of constant current efferent duct (N4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210043006.8A CN102612213B (en) | 2012-02-24 | 2012-02-24 | LED (light emitting diode) drive circuit structure with adjustable constant-voltage and constant-current mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210043006.8A CN102612213B (en) | 2012-02-24 | 2012-02-24 | LED (light emitting diode) drive circuit structure with adjustable constant-voltage and constant-current mode |
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| Publication Number | Publication Date |
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| CN102612213A true CN102612213A (en) | 2012-07-25 |
| CN102612213B CN102612213B (en) | 2014-07-02 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201311605Y (en) * | 2008-10-23 | 2009-09-16 | 安然 | Constant current control device |
| JP2010114224A (en) * | 2008-11-05 | 2010-05-20 | Aw Japan:Kk | Light-emitting diode (led) lighting device |
| CN201504346U (en) * | 2009-08-24 | 2010-06-09 | 东莞彩显有机发光科技有限公司 | OLED illumination lamp or back light source driving controller |
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2012
- 2012-02-24 CN CN201210043006.8A patent/CN102612213B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201311605Y (en) * | 2008-10-23 | 2009-09-16 | 安然 | Constant current control device |
| JP2010114224A (en) * | 2008-11-05 | 2010-05-20 | Aw Japan:Kk | Light-emitting diode (led) lighting device |
| CN201504346U (en) * | 2009-08-24 | 2010-06-09 | 东莞彩显有机发光科技有限公司 | OLED illumination lamp or back light source driving controller |
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| CN102612213B (en) | 2014-07-02 |
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Effective date of registration: 20190722 Address after: 214063 Building No. 777, A3, West Building, Binhu District, Wuxi City, Jiangsu Province, 305-306 Patentee after: Wuxi Haichuan Semiconductor Co., Ltd. Address before: 214035 China Sensor Network International Innovation Park Building A, Building 5, No. 200 Linghu Avenue, Taihu International Science Park, Wuxi New District, Jiangsu Province Patentee before: Wuxi Linghu Technology Co., Ltd. |
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