CN102737613A - Display circuit for gradual change of brightness - Google Patents
Display circuit for gradual change of brightness Download PDFInfo
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- CN102737613A CN102737613A CN2012102318255A CN201210231825A CN102737613A CN 102737613 A CN102737613 A CN 102737613A CN 2012102318255 A CN2012102318255 A CN 2012102318255A CN 201210231825 A CN201210231825 A CN 201210231825A CN 102737613 A CN102737613 A CN 102737613A
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Abstract
The invention relates to a display circuit for gradual change of brightness. The display circuit comprises a standard module, a square wave module, a constant current module, an integration module and a driving module, wherein the output end of the standard module is connected with an input end of the square wave module and an input end of the integration module respectively, the square wave module outputs constant square wave current to the other input end of the integration module through the constant current module, one path of the output end of the integration module is connected to the other input end of the square wave module, and the other path of the output end of the integration module is connected into the driving module. According to the display circuit, the software control or the dedicated chip is avoided, the display of the gradual change of the brightness is realized completely by hardware, and the display frequency of the gradual change of the brightness and the brightness ratio can be optionally adjusted according to the actual requirement, so that the display circuit is safe, stable and reliable and low in cost, and is very suitable for application and dissemination.
Description
Technical field
The present invention relates to a kind of gradual change display circuit, particularly brightness gradual change display circuit.
Background technology
Gradual change shows that the gradual change that mainly is meant brightness shows, luminescent devices such as design or LED are used widely setting type.Existing gradual change Presentation Function all is to realize through software control or by special chip, and its control principle is comparatively complicated, realizes that cost is higher.
Summary of the invention
The technical matters that the present invention will solve provides a kind of brightness gradual change display circuit, and when satisfying the gradual change display requirement, cost is low, is fit to apply.
Technical scheme of the present invention is:
A kind of brightness gradual change display circuit; Wherein: comprise base modules, square wave module, constant flow module, integration module and driver module; Described base modules output terminal is connected with square wave module one input end and integration module one input end respectively; To the constant square wave current of another input end output of integration module, the output terminal one tunnel of described integration module inserts another input end of square wave module to described square wave module through constant flow module, and driver module is inserted on another road of the output terminal of integration module.
In conjunction with the functional interpretation of each module of the present invention principle of work of the present invention: base modules of the present invention is used to set the dc reference of entire circuit, the reference point that control brightness gradual change shows; Described square wave module produces the square wave voltage signal that satisfies brightness gradual change display requirement through the associative multiplication sub-module; Described constant flow module is used for the square-wave voltage of square wave module output is converted into the square wave current signal of amplitude symmetry equivalent (constant); Described integration module is used for the square wave current signal of the other side's mode piece output after constant flow module is handled and carries out the triangle wave voltage signal that brightness gradual change display requirement is satisfied in the integration generation; Described driver module is used for accomplishing the driving work to display unit according to the triangle wave voltage signal of integration module output, realizes that finally the brightness gradual change shows.
Preferably, described base modules comprises the divider resistance that is connected between direct supply and the ground, and the input voltage of direct supply is carried out after the dividing potential drop output terminal as base modules.
Preferably; Described square wave module comprise first operational amplifier or comparer, with the feedback divider resistance of first operational amplifier or comparer serial or parallel connection; Described first operational amplifier or comparer comprise two input ends and an output terminal; The output terminal of base modules is as an input end of first operational amplifier or comparer, and the output terminal of integration module is as its another input end.Feedback divider resistance of the present invention feeds back the output end voltage of integration module, and associative operation amplifier or comparer produce the square wave voltage signal that satisfies brightness gradual change display requirement.
Preferably, described constant flow module comprise the diode that is connected with the output terminal of square wave module, with the resistance of diode serial or parallel connection.The square-wave voltage that diode of the present invention combines series connection with it or parallel resistor combination that the square wave module is exported converts the square wave current signal of amplitude symmetry equivalent (constant) into and exports to integration module.
Preferably; Described integration module comprises second operational amplifier or comparer, the electric capacity of parallel connection; Described second operational amplifier or comparer comprise two input ends and an output terminal; The output terminal of base modules is as an input end of second operational amplifier or comparer; The output terminal of constant flow module is as its another input end, and the output terminal of constant flow module is simultaneously also as the input end of electric capacity, and the parallelly connected binding site of the output terminal of second operational amplifier or comparer and the output terminal of electric capacity is as the output terminal of integration module.The operational amplifier of parallel connection of the present invention or comparer, electric capacity, the square wave current signal of the other side's mode piece output after constant flow module is handled carry out integration and produce the triangle wave voltage signal that satisfies brightness gradual change display requirement, and export to driver module.
Preferably; Described driver module comprises NPN type triode, current-limiting resistance, the display unit of series connection successively; The base stage of described NPN type triode is connected with the output terminal of integration module; Its collector is connected with direct supply, and its emitter is connected with display unit through current-limiting resistance, accomplishes the brightness gradual change display driver to display unit.
Preferably, described divider resistance comprises first divider resistance and second divider resistance that is connected between direct supply and the ground, and the described first divider resistance output terminal is as the output terminal of base modules.
Preferably; Described feedback divider resistance comprises the 3rd feedback divider resistance and the 4th feedback divider resistance; The output terminal of described integration module feeds back divider resistance as first operational amplifier or another input end of comparer through the 4th; Described the 3rd feedback divider resistance is parallelly connected with first operational amplifier or comparer, and the output terminal of first operational amplifier or comparer and the 3rd feeds back the parallelly connected binding site of output terminal of divider resistance as the output terminal of square wave module.
Preferably; Described resistance comprises the 6th resistance of connecting with diode and five resistance parallelly connected with diode in series and the 6th resistance; Described the 6th resistance is connected with the negative pole of diode; The positive pole of diode is connected with the output terminal of square wave module, and the parallelly connected binding site of the output terminal of the output terminal of the 5th resistance and the 6th resistance is as the output terminal of constant flow module.
Preferably, described display unit other end ground connection.
The function of operational amplifier of the present invention or comparer all is to be used for two input end input voltages are compared or amplify the output result that back control obtains its output terminal; Operational amplifier and comparer all can be realized this functional requirement of the present invention, and it all is feasible promptly adopting operational amplifier or comparer.
Need to prove, of the present invention about resistance first, second and third etc. the qualification word of quantity all are descriptions of technical scheme of the present invention for ease, its concrete quantity limits should be as the restriction for claim of the present invention.
Advantage of the present invention: the present invention proposes a kind of brightness gradual change display circuit; Software control or special chip have been avoided; Realized that by hardware the brightness gradual change shows fully, brightness gradual change display frequency of the present invention and light-dark ratio example can be regulated arbitrarily according to actual needs simultaneously, and safety and stability is reliable; Cost is low, is fit to very much apply.
Description of drawings
Accompanying drawing 1 is a module diagram of the present invention;
Accompanying drawing 2 is electrical block diagrams of the embodiment of the invention 11;
Reference numeral: direct supply Vcc, first operational amplifier or comparer U1-B, diode D1, second operational amplifier or comparer U1-A, capacitor C 1, NPN type triode Q1, current-limiting resistance R7, the first divider resistance R1, the second divider resistance R2, the 3rd feedback divider resistance R3, the 4th feedback divider resistance R4, the 5th resistance R 5, the 6th resistance R 6.
Embodiment
Embodiment 1, a kind of brightness gradual change display circuit; Wherein: comprise base modules, square wave module, constant flow module, integration module and driver module; Described base modules output terminal is connected with square wave module one input end and integration module one input end respectively; Described square wave module is exported constant square wave current through constant flow module to another input end of integration module; The output terminal one tunnel of described integration module inserts another input end of square wave module, and driver module is inserted on another road of the output terminal of integration module.
Embodiment 2, a kind of brightness gradual change display circuit, wherein: described base modules comprises the divider resistance that is connected between direct supply Vcc and the ground, and the input voltage of direct supply Vcc is carried out after the dividing potential drop as the output terminal of base modules, all the other are with embodiment 1.
Embodiment 3, a kind of brightness gradual change display circuit; Wherein: described square wave module comprise first operational amplifier or comparer U1-B, with the feedback divider resistance of first operational amplifier or comparer U1-B serial or parallel connection; Described first operational amplifier or comparer U1-B comprise two input ends and an output terminal; The output terminal of base modules is as the input end of first operational amplifier or comparer U1-B; The output terminal of integration module is as its another input end, and all the other are with embodiment 1 or embodiment 2.
Embodiment 4, a kind of brightness gradual change display circuit, wherein: described constant flow module comprise the diode D1 that is connected with the output terminal of square wave module, with the resistance of diode D1 serial or parallel connection, all the other are with embodiment 1 or embodiment 2 or embodiment 3.
Embodiment 5, a kind of brightness gradual change display circuit; Wherein: described integration module comprises second operational amplifier or comparer U1-A, the capacitor C 1 of parallel connection; Described second operational amplifier or comparer U1-A comprise two input ends and an output terminal; The output terminal of base modules is as the input end of second operational amplifier or comparer U1-A; The output terminal of constant flow module is as its another input end; The output terminal of constant flow module is simultaneously also as the input end of capacitor C 1, and the parallelly connected binding site of the output terminal of second operational amplifier or comparer U1-A and the output terminal of capacitor C 1 is as the output terminal of integration module, and all the other are with embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4.
Embodiment 6, a kind of brightness gradual change display circuit; Wherein: described driver module comprises NPN type triode Q1, current-limiting resistance R7, the display unit of series connection successively; The base stage of described NPN type triode Q1 is connected with the output terminal of integration module; Its collector is connected with direct supply Vcc, and its emitter is connected with display unit through current-limiting resistance R7, and all the other are with embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 or embodiment 5.
Embodiment 7, a kind of brightness gradual change display circuit; Wherein: described divider resistance comprises the first divider resistance R1 and the second divider resistance R2 that is connected between direct supply Vcc and the ground; The described first divider resistance R1 output terminal is as the output terminal of base modules, and all the other are with any one embodiment among the embodiment 2-6.
Embodiment 8, a kind of brightness gradual change display circuit; Wherein: described feedback divider resistance comprises the 3rd feedback divider resistance R3 and the 4th feedback divider resistance R4; The output terminal of described integration module feeds back divider resistance R4 as first operational amplifier or another input end of comparer U1-B through the 4th; Described the 3rd feedback divider resistance R3 is parallelly connected with first operational amplifier or comparer U1-B; The parallelly connected binding site of the output terminal of the output terminal of first operational amplifier or comparer U1-B and the 3rd feedback divider resistance R3 is as the output terminal of square wave module, and all the other are with any one embodiment among the embodiment 3-7.
Embodiment 9, a kind of brightness gradual change display circuit; Wherein: described resistance comprise the 6th resistance R 6 of connecting with diode D1 and with diode in series D1 and the 5th parallelly connected resistance R 5 of the 6th resistance R 6; Described the 6th resistance R 6 is connected with the negative pole of diode D1; The positive pole of diode D1 is connected with the output terminal of square wave module; The parallelly connected binding site of the output terminal of the output terminal of the 5th resistance R 5 and the 6th resistance R 6 is as the output terminal of constant flow module, and all the other are with any one embodiment among the embodiment 4-8.
Embodiment 10, a kind of brightness gradual change display circuit, wherein: described display unit other end ground connection, all the other are with any one embodiment among the embodiment 6-9.
Embodiment 11, a kind of brightness gradual change display circuit; Wherein: comprise base modules, square wave module, constant flow module, integration module and driver module; Described base modules output terminal is connected with square wave module one input end and integration module one input end respectively; Described square wave module is exported constant square wave current through constant flow module to another input end of integration module; The output terminal one tunnel of described integration module inserts another input end of square wave module, and driver module is inserted on another road of the output terminal of integration module; Described base modules comprises the divider resistance that is connected between direct supply Vcc and the ground; The input voltage of direct supply Vcc is carried out after the dividing potential drop output terminal as base modules; Described divider resistance comprises the first divider resistance R1 and the second divider resistance R2 that is connected between direct supply Vcc and the ground, and the described first divider resistance R1 output terminal is as the output terminal of base modules; Described square wave module comprise first operational amplifier or comparer U1-B, with the feedback divider resistance of first operational amplifier or comparer U1-B serial or parallel connection; Described first operational amplifier or comparer U1-B comprise two input ends and an output terminal; The output terminal of base modules is as the input end of first operational amplifier or comparer U1-B; The output terminal of integration module is as its another input end; Described feedback divider resistance comprises the 3rd feedback divider resistance R3 and the 4th feedback divider resistance R4; The output terminal of described integration module feeds back divider resistance R4 as first operational amplifier or another input end of comparer U1-B through the 4th; Described the 3rd feedback divider resistance R3 is parallelly connected with first operational amplifier or comparer U1-B, and the output terminal of first operational amplifier or comparer U1-B and the 3rd feeds back the parallelly connected binding site of output terminal of divider resistance R3 as the output terminal of square wave module; Described constant flow module comprise the diode D1 that is connected with the output terminal of square wave module, with the resistance of diode D1 serial or parallel connection; Described resistance comprise the 6th resistance R 6 of connecting with diode D1 and with diode in series D1 and the 5th parallelly connected resistance R 5 of the 6th resistance R 6; Described the 6th resistance R 6 is connected with the negative pole of diode D1; The positive pole of diode D1 is connected with the output terminal of square wave module, and the parallelly connected binding site of the output terminal of the output terminal of the 5th resistance R 5 and the 6th resistance R 6 is as the output terminal of constant flow module; Described integration module comprises second operational amplifier or comparer U1-A, the capacitor C 1 of parallel connection; Described second operational amplifier or comparer U1-A comprise two input ends and an output terminal; The output terminal of base modules is as the input end of second operational amplifier or comparer U1-A; The output terminal of constant flow module is as its another input end; The output terminal of constant flow module is simultaneously also as the input end of capacitor C 1, and the parallelly connected binding site of the output terminal of second operational amplifier or comparer U1-A and the output terminal of capacitor C 1 is as the output terminal of integration module; Described driver module comprises NPN type triode Q1, current-limiting resistance R7, the LED display unit of series connection successively; The base stage of described NPN type triode Q1 is connected with the output terminal of integration module; Its collector is connected with direct supply Vcc; Its emitter is connected with display unit through current-limiting resistance R7, described LED display unit other end ground connection, and all the other are with any one embodiment among the embodiment 1-10.
The above only is a preferred implementation of the present invention; Should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the principle of the invention; Described circuit is made some improvement and retouching, and these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. brightness gradual change display circuit; It is characterized in that: comprise base modules, square wave module, constant flow module, integration module and driver module; Described base modules output terminal is connected with square wave module one input end and integration module one input end respectively; Described square wave module is exported constant square wave current through constant flow module to another input end of integration module; The output terminal one tunnel of described integration module inserts another input end of square wave module, and driver module is inserted on another road of the output terminal of integration module.
2. a kind of brightness gradual change display circuit as claimed in claim 1; It is characterized in that: described base modules comprises the divider resistance that is connected between direct supply (Vcc) and the ground, and the input voltage of direct supply (Vcc) is carried out after the dividing potential drop output terminal as base modules.
3. a kind of brightness gradual change display circuit as claimed in claim 1; It is characterized in that: described square wave module comprise first operational amplifier or comparer (U1-B), with the feedback divider resistance of first operational amplifier or comparer (U1-B) serial or parallel connection; Described first operational amplifier or comparer (U1-B) comprise two input ends and an output terminal; The output terminal of base modules is as an input end of first operational amplifier or comparer (U1-B), and the output terminal of integration module is as its another input end.
4. a kind of brightness gradual change display circuit as claimed in claim 1 is characterized in that: described constant flow module comprise the diode (D1) that is connected with the output terminal of square wave module, with the resistance of diode (D1) serial or parallel connection.
5. a kind of brightness gradual change display circuit as claimed in claim 1; It is characterized in that: described integration module comprises second operational amplifier or comparer (U1-A), the electric capacity (C1) of parallel connection; Described second operational amplifier or comparer (U1-A) comprise two input ends and an output terminal; The output terminal of base modules is as an input end of second operational amplifier or comparer (U1-A); The output terminal of constant flow module is as its another input end; The output terminal of constant flow module is simultaneously also as the input end of electric capacity (C1), and the parallelly connected binding site of the output terminal of second operational amplifier or comparer (U1-A) and the output terminal of electric capacity (C1) is as the output terminal of integration module.
6. a kind of brightness gradual change display circuit as claimed in claim 1; It is characterized in that: described driver module comprises NPN type triode (Q1), current-limiting resistance (R7), the display unit of series connection successively; The base stage of described NPN type triode (Q1) is connected with the output terminal of integration module; Its collector is connected with direct supply (Vcc), and its emitter is connected with display unit through current-limiting resistance (R7).
7. a kind of brightness gradual change display circuit as claimed in claim 2; It is characterized in that: described divider resistance comprises first divider resistance (R1) and second divider resistance (R2) that is connected between direct supply (Vcc) and the ground, and described first divider resistance (R1) output terminal is as the output terminal of base modules.
8. a kind of brightness gradual change display circuit as claimed in claim 3; It is characterized in that: described feedback divider resistance comprises the 3rd feedback divider resistance (R3) and the 4th feedback divider resistance (R4); The output terminal of described integration module feeds back divider resistance (R4) as first operational amplifier or another input end of comparer (U1-B) through the 4th; Described the 3rd feedback divider resistance (R3) is parallelly connected with first operational amplifier or comparer (U1-B), and the output terminal of first operational amplifier or comparer (U1-B) and the 3rd feeds back the parallelly connected binding site of output terminal of divider resistance (R3) as the output terminal of square wave module.
9. a kind of brightness gradual change display circuit as claimed in claim 4; It is characterized in that: described resistance comprises the 6th resistance (R6) of connecting with diode (D1) and five resistance (R5) parallelly connected with diode in series (D1) and the 6th resistance (R6); Described the 6th resistance (R6) is connected with the negative pole of diode (D1); The positive pole of diode (D1) is connected with the output terminal of square wave module, and the parallelly connected binding site of the output terminal of the output terminal of the 5th resistance (R5) and the 6th resistance (R6) is as the output terminal of constant flow module.
10. a kind of brightness gradual change display circuit as claimed in claim 6 is characterized in that: described display unit other end ground connection.
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| CN2012102318255A CN102737613A (en) | 2012-07-05 | 2012-07-05 | Display circuit for gradual change of brightness |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102318255A CN102737613A (en) | 2012-07-05 | 2012-07-05 | Display circuit for gradual change of brightness |
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| CN2012102318255A Pending CN102737613A (en) | 2012-07-05 | 2012-07-05 | Display circuit for gradual change of brightness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116633124A (en) * | 2023-07-21 | 2023-08-22 | 泉州艾奇科技有限公司 | Constant-current voltage stabilizing circuit suitable for alternating current and direct current |
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Application publication date: 20121017 |