CN203387492U - LED brightness control device - Google Patents
LED brightness control device Download PDFInfo
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- CN203387492U CN203387492U CN201320461143.3U CN201320461143U CN203387492U CN 203387492 U CN203387492 U CN 203387492U CN 201320461143 U CN201320461143 U CN 201320461143U CN 203387492 U CN203387492 U CN 203387492U
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Abstract
The utility model discloses an LED brightness control device which comprises a pulse preprocessing circuit and a brightness signal generating circuit. The LED brightness control device can generate 10-bit brightness control signal output by only requiring a brightness control pulse excitation, and can enable an LED circuit to have 10 grades of brightness variations. The LED brightness control device can sequentially generate the 10-grade brightness control signal output in a circulation mode accurately under the pulse excitation, and can filter pulse signals with the width being less than 500ns, thereby eliminating noises and interferences, and ensuring an LED to obtain accurate control.
Description
Technical field
The utility model belongs to LED luminescence technology field, more particularly, relates to a kind of LED brightness controlling device.
Background technology
Because LED has energy-saving and environmental protection, the high many merits that waits of luminous efficiency, the application of LED is more and more extensive, thereby the demand of LED brightness Drive and Control Circuit is also more and more higher.The brightness of General Requirements LED can facilitate regulation and control.
The LED Drive and Control Circuit mostly is the constant current drive-type at present, pursues maximum brightness.And the general more complicated all of LED brightness Drive and Control Circuit, especially on segmentation is controlled.Therefore, can very simply realize the control of microprocessor, and few with the interface of microprocessor, and technology simple in structure becomes the emphasis of research.
The utility model content
Main purpose of the present utility model is, overcomes the defect that existing LED Drive and Control Circuit exists, and a kind of LED brightness controlling device is provided, and can realize the brightness of LED is regulated, thereby more be suitable for practicality, and have the value on industry.
The purpose of this utility model and solve its technical problem and realize by the following technical solutions.A kind of LED brightness controlling device according to the utility model proposes, comprising: pulse pre-process circuit and luminance signal producing circuits; Wherein
Described pulse pre-process circuit comprises: the first inverter, the second inverter, the 3rd inverter, the 4th inverter, the 5th inverter, hex inverter, the 7th inverter, NAND gate, NOR gate, resistance, electric capacity, Schmidt trigger, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor; Wherein:
The output of described the first inverter is connected with the input of described the second inverter, NAND gate and NOR gate respectively;
The output of described the second inverter is connected with the input of described resistance;
Described resistance output is connected with the input of described electric capacity;
The output of described NAND gate is connected with the input of described the 3rd inverter;
The output of described NOR gate is connected with the input of described the 4th inverter;
The output of described the 3rd inverter is connected with the grid of described the first metal-oxide-semiconductor;
The output of described the 4th inverter is connected with the grid of described the second metal-oxide-semiconductor;
After being connected with the output of described resistance respectively, the drain electrode of the drain electrode of described the first metal-oxide-semiconductor and described the second metal-oxide-semiconductor is connected with the input of described Schmidt trigger;
After being connected with the output of described electric capacity, the source electrode of described the second metal-oxide-semiconductor is connected with the input of described Schmidt trigger;
The output of described Schmidt trigger is connected with the input of described the 5th inverter;
The output of described the 5th inverter is connected with the input of described hex inverter;
The output of described hex inverter is connected with the output of the first inverter with the input of described the 7th inverter respectively;
The output of described the 7th inverter is connected with described luminance signal producing circuits.
Aforesaid LED brightness controlling device, wherein, described Schmidt trigger comprises: the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor, the 7th metal-oxide-semiconductor, the 8th metal-oxide-semiconductor and the 9th metal-oxide-semiconductor; Wherein:
The grid of described the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor and the 6th metal-oxide-semiconductor is connected with output, the first metal-oxide-semiconductor and the drain electrode of the second metal-oxide-semiconductor of described resistance respectively;
The drain electrode of described the 3rd metal-oxide-semiconductor is connected with the source electrode of the 7th metal-oxide-semiconductor with described the 4th metal-oxide-semiconductor;
The drain electrode of described the 4th metal-oxide-semiconductor is connected with the grid of the 8th metal-oxide-semiconductor with described the 5th metal-oxide-semiconductor drain electrode;
The source electrode of described the 5th metal-oxide-semiconductor is connected with the source electrode of the 8th metal-oxide-semiconductor with the drain electrode of described the 6th metal-oxide-semiconductor;
The source electrode of described the 6th metal-oxide-semiconductor is connected with the source electrode of the 9th metal-oxide-semiconductor with the source electrode of the output of described electric capacity, the second metal-oxide-semiconductor;
After being connected with the grid of described the 8th metal-oxide-semiconductor, the grid of described the 7th metal-oxide-semiconductor is connected with the output of described the 5th inverter;
The grid of described the 9th metal-oxide-semiconductor is connected with the drain electrode of described the 8th metal-oxide-semiconductor;
The drain electrode of described the 9th metal-oxide-semiconductor is connected with the drain electrode of described the 7th metal-oxide-semiconductor.
Aforesaid LED brightness controlling device, wherein, described luminance signal producing circuits comprises: 11 d type flip flops, inverter and two are by an inverter and a resistance-capacitance network that resistance forms; Wherein:
Described 11 d type flip flops adopt the form of cascade to form luminance signal producing circuits;
The Q end of front ten d type flip flops is output as the brightness control signal of ten;
The Q output of each d type flip flop is connected with the D input of next d type flip flop;
The reset signal of described 11 d type flip flops is with together with clock signal is connected to;
The input signal of described pulse pre-process circuit is added to the clock end of described 11 d type flip flops;
The D termination high level VDD of described first d type flip flop;
The Q end of the 11 d type flip flop feeds back to clear terminal RESET through inverter and two resistance-capacitance networks.
By technique scheme, the utility model LED brightness controlling device at least has following advantages:
From above-mentioned technical scheme, can find out, the disclosed a kind of LED brightness controlling device of the utility model, only need a brilliance control pulse excitation, device just can produce the brightness control signal output of 10, can be so that LED circuit have 10 grades of brightness to change, 10 grades of brightness control signals outputs of circulation generation successively under pulse excitation that this device can be correct, and can the filtering width be the following pulse signal of 500ns, remove Noise and Interference, guarantee correct controlled of LED.
In sum, the LED brightness controlling device of the utility model special construction, it has above-mentioned many advantages and practical value, thereby more is suitable for practicality.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be implemented according to the content of specification, below with preferred embodiment of the present utility model and coordinate accompanying drawing to be described in detail as follows.
The accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation that Fig. 1 is the disclosed a kind of LED brightness controlling device of the utility model;
The circuit diagram that Fig. 2 is the disclosed pulse pre-process circuit of the utility model;
The circuit diagram that Fig. 3 is the disclosed luminance signal producing circuits of the utility model;
The circuit theory diagrams that Fig. 4 is the disclosed LED brilliance control of the utility model.
Embodiment
Be to reach technological means and the effect that predetermined utility model purpose is taked for further setting forth the utility model, below in conjunction with accompanying drawing and preferred embodiment, embodiment of the present utility model be described in detail as follows.
The utility model discloses a kind of LED brightness controlling device, can realize the brightness of LED is regulated.
As shown in Figure 1, Figure 2 and Figure 3, a kind of LED brightness controlling device comprises: pulse pre-process circuit and luminance signal producing circuits; Wherein
The pulse pre-process circuit comprises: the first inverter A1, the second inverter A2, the 3rd inverter A3, the 4th inverter A4, the 5th inverter A5, hex inverter A6, the 7th inverter A7, NAND gate B1, NOR gate D1, resistance R, capacitor C, Schmidt trigger, the first metal-oxide-semiconductor M8 and the second metal-oxide-semiconductor M9; Wherein:
The output of the first inverter A1 is connected with the input of NOR gate D1 with the second inverter A2, NAND gate B1 respectively;
The output of the second inverter A2 is connected with the input of resistance R;
The resistance R output is connected with the input of capacitor C;
The output of NAND gate B1 is connected with the input of the 3rd inverter A3;
The output of NOR gate D1 is connected with the input of the 4th inverter A4;
The output of the 3rd inverter A3 is connected with the grid of the first metal-oxide-semiconductor M8;
The output of the 4th inverter A4 is connected with the grid of the second metal-oxide-semiconductor M9;
After being connected with the output of resistance R respectively, the drain electrode of the drain electrode of the first metal-oxide-semiconductor M8 and the second metal-oxide-semiconductor M9 is connected with the input of Schmidt trigger;
After being connected with the output of capacitor C, the source electrode of the second metal-oxide-semiconductor M9 is connected with the input of Schmidt trigger;
The output of Schmidt trigger is connected with the input of the 5th inverter A5;
The output of the 5th inverter A5 is connected with the input of hex inverter A6;
The output of hex inverter A6 is connected with the output of the first inverter M8 with the input of the 7th inverter A7 respectively;
The output of the 7th inverter A7 is connected with luminance signal producing circuits.
Schmidt trigger comprises: the 3rd metal-oxide-semiconductor M1, the 4th metal-oxide-semiconductor M2, the 5th metal-oxide-semiconductor M3, the 6th metal-oxide-semiconductor M4, the 7th metal-oxide-semiconductor M5, the 8th metal-oxide-semiconductor M6 and the 9th metal-oxide-semiconductor M7; Wherein:
The grid of the 3rd metal-oxide-semiconductor M1, the 4th metal-oxide-semiconductor M2, the 5th metal-oxide-semiconductor M3 and the 6th metal-oxide-semiconductor M4 is connected with the drain electrode of the second metal-oxide-semiconductor M9 with output, the first metal-oxide-semiconductor M8 of resistance R respectively;
The drain electrode of the 3rd metal-oxide-semiconductor M1 is connected with the source electrode of the 7th metal-oxide-semiconductor M5 with the 4th metal-oxide-semiconductor M2;
The drain electrode of the 4th metal-oxide-semiconductor M2 is connected with the grid of the 8th metal-oxide-semiconductor M6 with the 5th metal-oxide-semiconductor M3 drain electrode;
The source electrode of the 5th metal-oxide-semiconductor M3 is connected with the source electrode of the 8th metal-oxide-semiconductor M6 with the drain electrode of the 6th metal-oxide-semiconductor M4;
The source electrode of the 6th metal-oxide-semiconductor M4 is connected with the source electrode of the 9th metal-oxide-semiconductor M7 with the source electrode of the output of capacitor C, the second metal-oxide-semiconductor M9;
After being connected with the grid of the 8th metal-oxide-semiconductor M6, the grid of the 7th metal-oxide-semiconductor M5 is connected with the output of the 5th inverter A5;
The grid of the 9th metal-oxide-semiconductor M7 is connected with the drain electrode of the 8th metal-oxide-semiconductor M6;
The drain electrode of the 9th metal-oxide-semiconductor M7 is connected with the drain electrode of described metal-oxide-semiconductor M5.
Luminance signal producing circuits comprises: 11 d type flip flops, inverter and two are by an inverter and a resistance-capacitance network that resistance forms; Wherein:
11 d type flip flops adopt the form of cascade to form luminance signal producing circuits;
The Q end of front ten d type flip flops is output as the brightness control signal D0-D9 of ten;
The Q output of each d type flip flop is connected with the D input of next d type flip flop;
The reset signal of 11 d type flip flops is with together with clock signal is connected to;
The input signal of pulse pre-process circuit is added to the clock end of 11 d type flip flops;
The D termination high level VDD of first d type flip flop;
The Q end of the 11 d type flip flop feeds back to clear terminal RESET through inverter and two resistance-capacitance networks.
Below in conjunction with Fig. 1, Fig. 2 and Fig. 3, the principle of the disclosed a kind of LED brightness controlling device of the utility model is described in detail.
The control signal that enters circuit must be removed Noise and Interference, could work.This just need to add the pulse pre-process circuit on the pulse signal path, and pulse-width and amplitude are limited, thereby avoid false triggering.As shown in Figure 2, be input as the brilliance control pulse signal, the output w1 of the first inverter A1 is added to one to input signal by resistance R and capacitor C delay circuit in series by the second inverter A2.The 3rd metal-oxide-semiconductor M1, the 4th metal-oxide-semiconductor M2, the 5th metal-oxide-semiconductor M3, the 6th metal-oxide-semiconductor M4, the 7th metal-oxide-semiconductor M5, the 8th metal-oxide-semiconductor M6 and the 9th metal-oxide-semiconductor M7 form a Schmidt trigger, its output is by hex inverter A6 and the 7th inverter A7 time delay, feed back to the output end w4 of the 7th reverser A7, the level of locking Schmidt trigger input w3, until incoming level just changes while changing.When input becomes high level from low level, NAND gate B1 closes, the first metal-oxide-semiconductor M8 grid low level is turn-offed, NOR gate D1 opens, the output w2 of the second inverter A2 becomes high level, thus the capacitor C charging, and the input w3 voltage of Schmidt trigger raises gradually, until, higher than the forward threshold voltage of Schmidt trigger, make output switching activity.When the input w3 of Schmidt trigger is low level, the output output high level of Schmidt trigger, the 7th metal-oxide-semiconductor M5 conducting, when the voltage of the input w3 of Schmidt trigger rises to the threshold voltage of the 3rd metal-oxide-semiconductor M1, the 3rd metal-oxide-semiconductor M1 conducting, form path with the 7th metal-oxide-semiconductor M5 and the 9th metal-oxide-semiconductor M7, now, the 3rd metal-oxide-semiconductor M1, the 7th metal-oxide-semiconductor M5 and the 9th metal-oxide-semiconductor M5 are operated in dark triode region, be equivalent to respectively a resistance, the 4th metal-oxide-semiconductor M2 source class voltage obtains by these three electric resistance partial pressures.As long as select suitable resistance R and the value of capacitor C, just can realize discharging and recharging the time delay of 500ns, when the pulse high level width is less than 500ns, when capacitor C also is not charged to 2.36V, just start electric discharge, or capacitor C is not while also discharging into 1.24V, just start charging, so do not reach the corresponding switching levels of Schmidt trigger, output remains unchanged, pulse is by filtering.
As shown in Figure 3, with 11 d type flip flops, adopt the form of cascade to form luminance signal producing circuits, the Q end output of front 10 triggers is exactly the brightness control signal D0-D9 of 10.They each Q output is connected with next D input, reset signal and the clock signal of 11 d type flip flops all are connected together respectively, be added to the clock end of 11 triggers through the input signal of extra pulse pre-process circuit, the D termination high level VDD of first d type flip flop, the Q end of last d type flip flop feeds back to clear terminal RESET through inverter and two resistance-capacitance networks, adding of resistance-capacitance circuit is in order to increase time delay, make feedback signal maintain the regular hour, guarantee correct zero clearing, avoid the existence of internal digital circuit competition.
After pre-zero clearing, the output of D0-D9 is all high level 1, and when control impuls is inputted, D0-D9 is output low level 0 successively, and paired pulses is counted, and when the 10th pulse arrives, the output of D0-D9 is all low level 0.When the 11st pulse arrives, low level 0 feeds back to clear terminal, and all d type flip flop zero clearings reset, and D0-D9 gets back to initial condition, waits for the next round circulation.Like this, D0-D9 just can be used as increase and the minimizing that switching signal is controlled the LED electric current, altogether can make LED that the variation of 10 grades of brightness is arranged, and the number of input pulse is depended in brightness, until when the input control pulse is arranged, brightness just changes.
As shown in Figure 4, be the circuit theory diagrams of the disclosed LED brilliance control of the utility model.
When the LED brilliance control, form the circuit as shown in the LED brilliance control application principle figure in Fig. 4.The electric current that current source produces produces voltage by resistance R m, input amplifier anode, resistance R _ f and resistance R 0-R9 pressure drop in parallel feeds back to the amplifier negative terminal, and amplifier output connects 10 metal-oxide-semiconductor grids by the switching tube of D0-D9 signal controlling, and each ohmically voltage feeds back to the end of oppisite phase of amplifier.So, when brightness control signal D0-D9 connects respective channels, the resistance in path just has electric current and flows through, thereby increase the total current that flows through LED, otherwise, while turn-offing respective channels, the LED total current reduces.Like this, just realized the variation of 10 grades of LED brightness, the size that every one-level brightness changes depends on the resistance value of respective channels and the number in parallel of metal-oxide-semiconductor.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.Multiple modification to these embodiment will be apparent for those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from spirit or scope of the present utility model, realization in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (3)
1. a LED brightness controlling device, is characterized in that, comprising: pulse pre-process circuit and luminance signal producing circuits; Wherein:
Described pulse pre-process circuit comprises: the first inverter, the second inverter, the 3rd inverter, the 4th inverter, the 5th inverter, hex inverter, the 7th inverter, NAND gate, NOR gate, resistance, electric capacity, Schmidt trigger, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor; Wherein:
The output of described the first inverter is connected with the input of described the second inverter, NAND gate and NOR gate respectively;
The output of described the second inverter is connected with the input of described resistance;
Described resistance output is connected with the input of described electric capacity;
The output of described NAND gate is connected with the input of described the 3rd inverter;
The output of described NOR gate is connected with the input of described the 4th inverter;
The output of described the 3rd inverter is connected with the grid of described the first metal-oxide-semiconductor;
The output of described the 4th inverter is connected with the grid of described the second metal-oxide-semiconductor;
After being connected with the output of described resistance respectively, the drain electrode of the drain electrode of described the first metal-oxide-semiconductor and described the second metal-oxide-semiconductor is connected with the input of described Schmidt trigger;
After being connected with the output of described electric capacity, the source electrode of described the second metal-oxide-semiconductor is connected with the input of described Schmidt trigger;
The output of described Schmidt trigger is connected with the input of described the 5th inverter;
The output of described the 5th inverter is connected with the input of described hex inverter;
The output of described hex inverter is connected with the output of the first inverter with the input of described the 7th inverter respectively;
The output of described the 7th inverter is connected with described luminance signal producing circuits.
2. LED brightness controlling device according to claim 1, is characterized in that, described Schmidt trigger comprises: the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor, the 7th metal-oxide-semiconductor, the 8th metal-oxide-semiconductor and the 9th metal-oxide-semiconductor; Wherein:
The grid of described the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor and the 6th metal-oxide-semiconductor is connected with output, the first metal-oxide-semiconductor and the drain electrode of the second metal-oxide-semiconductor of described resistance respectively;
The drain electrode of described the 3rd metal-oxide-semiconductor is connected with the source electrode of the 7th metal-oxide-semiconductor with described the 4th metal-oxide-semiconductor;
the drain electrode of described the 4th metal-oxide-semiconductor is connected with the grid of the 8th metal-oxide-semiconductor with described the 5th metal-oxide-semiconductor drain electrode;
The source electrode of described the 5th metal-oxide-semiconductor is connected with the source electrode of the 8th metal-oxide-semiconductor with the drain electrode of described the 6th metal-oxide-semiconductor;
The source electrode of described the 6th metal-oxide-semiconductor is connected with the source electrode of the 9th metal-oxide-semiconductor with the source electrode of the output of described electric capacity, the second metal-oxide-semiconductor;
After being connected with the grid of described the 8th metal-oxide-semiconductor, the grid of described the 7th metal-oxide-semiconductor is connected with the output of described the 5th inverter;
The grid of described the 9th metal-oxide-semiconductor is connected with the drain electrode of described the 8th metal-oxide-semiconductor;
The drain electrode of described the 9th metal-oxide-semiconductor is connected with the drain electrode of described the 7th metal-oxide-semiconductor.
3. LED brightness controlling device according to claim 1, is characterized in that, described luminance signal producing circuits comprises: 11 d type flip flops, inverter and two are by an inverter and a resistance-capacitance network that resistance forms; Wherein:
Described 11 d type flip flops adopt the form of cascade to form luminance signal producing circuits;
The Q end of front ten d type flip flops is output as the brightness control signal of ten;
The Q output of each d type flip flop is connected with the D input of next d type flip flop;
The reset signal of described 11 d type flip flops is with together with clock signal is connected to;
The input signal of described pulse pre-process circuit is added to the clock end of described 11 d type flip flops;
The D termination high level VDD of described first d type flip flop;
The Q end of the 11 d type flip flop feeds back to clear terminal RESET through inverter and two resistance-capacitance networks.
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|---|---|---|---|
| CN201320461143.3U CN203387492U (en) | 2013-07-30 | 2013-07-30 | LED brightness control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320461143.3U CN203387492U (en) | 2013-07-30 | 2013-07-30 | LED brightness control device |
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| CN203387492U true CN203387492U (en) | 2014-01-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354689A (en) * | 2013-08-02 | 2013-10-16 | 张掖市华光太阳能有限公司 | Driving power device for LED lamp dimming |
| CN105163431B (en) * | 2015-08-21 | 2017-10-31 | 上海艾为电子技术股份有限公司 | Drive circuit, illuminating circuit and mobile terminal |
-
2013
- 2013-07-30 CN CN201320461143.3U patent/CN203387492U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354689A (en) * | 2013-08-02 | 2013-10-16 | 张掖市华光太阳能有限公司 | Driving power device for LED lamp dimming |
| CN103354689B (en) * | 2013-08-02 | 2015-06-17 | 张掖市华光太阳能有限公司 | Driving power device for LED lamp dimming |
| CN105163431B (en) * | 2015-08-21 | 2017-10-31 | 上海艾为电子技术股份有限公司 | Drive circuit, illuminating circuit and mobile terminal |
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