CN102612213B - 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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- CN102612213B CN102612213B CN201210043006.8A CN201210043006A CN102612213B CN 102612213 B CN102612213 B CN 102612213B CN 201210043006 A CN201210043006 A CN 201210043006A CN 102612213 B CN102612213 B CN 102612213B
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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, and 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, there is the advantages such as life-span length, economize on electricity, high brightness, manifold color-emitting, fast response time and driving voltage are low, in saving the energy, can also regulate LED luminous intensity by PWM device, recall multiple color, then realize multiple display effect by circuit control according to R, G, B three primary colors mixed light principle.Now just be widely used in the fields such as city lighting, building and scenery lighting, light of stage design.
Due to different application conditions, the driving of LED is divided into constant voltage and two kinds of patterns of constant current.Constant voltage mode is to add fixing voltage drive at the grid of driving tube, and constant current mode is to add suitable biasing to make the load current on driving tube keep invariable.In actual applications, 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, apply the shortcomings such as loaded down with trivial details, high cost.
In view of flexibility and the system cost of product application are considered: a kind of simple in structure, the conversion regime flexibly adjustable LED Drive Structure of constant pressure and flow pattern just becomes a kind of demand.
Summary of the invention
The object of the present invention is to provide one simple in structure, conversion regime is the adjustable LED drive circuit structure of constant pressure and flow pattern flexibly.
Technical scheme of the present invention is as follows:
The LED drive circuit structure that constant pressure and flow pattern is adjustable, comprises following functions module:
A. constant flow module: comprise constant-current source, current-to-voltage convertor and constant current resistance; Described constant-current source mirror image reference current, described current-to-voltage convertor is converted to reference voltage reference current, and described constant current resistance converts constant current to reference voltage, is finally exported by constant current output pipe;
B. constant voltage module: comprise input buffer; Described input buffer, reverse input signal Buffer output, is then exported by constant current output pipe, constant voltage efferent duct jointly;
C. unit switch module: comprise mode selector switch and unit switch, switch by two groups of switch combinations, form constant voltage and the adjustable output of constant current mode;
D. output module: comprise constant current output pipe and constant voltage efferent duct; Under constant current mode, form output by described constant current output pipe; Constant voltage mode forms output jointly by described constant current output pipe and described constant voltage efferent duct.
Its further technical scheme is: particular circuit configurations comprises mode selector switch, input separator tube, current source, unit switch, current/voltage crossover connection, resistance, constant current resistance, constant current output pipe and constant voltage efferent duct; Described mode selector switch is 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 input separator tube; Described input separator tube is the gun stocks being 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; Described current source is PMOS pipe, and its grid is as reference signal input, and its drain electrode is connected with the first input end of unit switch; The second input end grounding of described unit switch; Described current/voltage crossover connection is NMOS pipe, and its drain electrode is connected with the drain electrode of current source, ground connection after its grid series connection resistance and constant current resistance; Described constant current output pipe and constant voltage efferent duct are NMOS pipe, and both are in parallel, and one end in parallel is connected with the common end of resistance and constant current resistance, and the other end in parallel is as the output of whole circuit; The grid of described constant current output pipe is connected with the output of unit switch, and the grid of described constant voltage efferent duct is connected with the output of input separator tube.
And, its further technical scheme is: described unit switch manages by inverter and a pair of NMOS the transmission gate forming, its control end is connected with the grid of mode selector switch, its first input end is connected with the output of input separator tube, its second input end grounding, its output is connected with the grid of constant current output pipe.
Useful technique effect of the present invention is:
The present invention proposes the specific implementation form 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 jointly formed the adjustable LED Drive Structure of a kind of two kinds of patterns by unit switch in conjunction with traditional constant voltage mode.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.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is line map of the present invention.
Fig. 3 is the line map of unit switch MUX1.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
As shown in Figure 1, the present invention is made up of jointly constant flow module A, constant voltage module B, unit switch module C, output module D, and unit switch C can select constant flow module A or constant voltage module B according to mode state, finally exports by output module D.
As shown in Figure 2, hardware logic of the present invention, by mode selector switch P1, is inputted separator tube P2, N2, current source P3, unit switch MUX1, current/voltage crossover connection N3, resistance R1, constant current resistance R2, constant current output pipe N4, the components and parts compositions such as constant voltage efferent duct N5.
Under constant voltage mode, mode switching signal MODE is 0, mode selector switch P1 conducting, input signal DIN enters unit switch MUX1 through input separator tube P2, N2 A after swinging to holds, now mode switching signal acts on unit switch MUX1, side a and b is connected, and input signal DIN is carried in the grid of constant current output pipe N4 and constant voltage efferent duct N5 simultaneously, and constant current output pipe 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 output pipe N4 pipe is closed.Under input signal DIN effective status, current source P3 has constant electric current I 1 current flowing voltage transitions pipe N3, grid (D point) at current/voltage crossover connection N3 induces constant voltage V1, because no current on the grid of current/voltage crossover connection N3 flows through, resistance R1 both end voltage equates, constant voltage V1, by constant current resistance R2, forms constant current I2, and constant current is exported by constant current output pipe N5.
Under constant current mode, the constant current of current source P3 has band gap reference to produce, and not affected by supply voltage, and final constant current value is: I2=V1/R2.
Above-described is only the preferred embodiment of the present invention, the invention is not restricted to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate without departing from the basic idea of the present invention, within all should thinking and being included in protection scope of the present invention.
Claims (2)
1. the adjustable LED drive circuit structure of constant pressure and flow pattern, is characterized in that comprising following functions module:
A. constant flow module: comprise constant-current source, current-to-voltage convertor and constant current resistance; Described constant-current source mirror image reference current, described current-to-voltage convertor is converted to reference voltage reference current, and described constant current resistance converts constant current to reference voltage, is finally exported by constant current output pipe;
B. constant voltage module: comprise input buffer; Described input buffer, reverse input signal Buffer output, is then exported by constant current output pipe, constant voltage efferent duct jointly;
C. unit switch module: comprise mode selector switch and unit switch, switch by two groups of switch combinations, form constant voltage and the adjustable output of constant current mode;
D. output module: comprise constant current output pipe and constant voltage efferent duct; Under constant current mode, form output by described constant current output pipe; Constant voltage mode forms output jointly by described constant current output pipe and described constant voltage efferent duct;
Particular circuit configurations is as follows: comprise mode selector switch (P1), input separator tube (P2, N2), current source (P3), unit switch (MUX1), current/voltage crossover connection (N3), resistance (R1), constant current resistance (R2), constant current output pipe (N4) and constant voltage efferent duct (N5);
Described mode selector switch (P1) is 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 separator tube (P2, N2); Described input separator tube (P2, N2) is the gun stocks being 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); Described current source (P3) is PMOS pipe, and its grid is as reference signal input, and its drain electrode is connected with the first input end of unit switch (MUX1); The second input end grounding of described unit switch (MUX1); Described current/voltage crossover connection (N3) is NMOS pipe, and its drain electrode is connected with the drain electrode of current source (P3), ground connection after its grid series connection resistance (R1) and constant current resistance (R2); Described constant current output pipe (N4) and constant voltage efferent duct (N5) are NMOS pipe, and both are in parallel, and one end in parallel is connected with the common end of constant current resistance (R2) with resistance (R1), and the other end in parallel is as the output of whole circuit; The grid of described constant current output pipe (N4) is connected with the output of unit switch (MUX1), and the grid of described constant voltage efferent duct (N5) is connected with the output of input separator tube (P2, N2).
2. the adjustable LED drive circuit structure of constant pressure and flow pattern according to claim 1, it is characterized in that: described unit switch (MUX1) manages by inverter and a pair of NMOS the transmission gate forming, 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 separator tube (P2, N2), its the second input (C) ground connection, its output (B) is connected with the grid of constant current output pipe (N4).
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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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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN102612213A CN102612213A (en) | 2012-07-25 |
| CN102612213B true 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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| CN102612213A (en) | 2012-07-25 |
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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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