CN202231928U - Brightness control device of light emitting diode (LED) light - Google Patents
Brightness control device of light emitting diode (LED) light Download PDFInfo
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- CN202231928U CN202231928U CN 201120390991 CN201120390991U CN202231928U CN 202231928 U CN202231928 U CN 202231928U CN 201120390991 CN201120390991 CN 201120390991 CN 201120390991 U CN201120390991 U CN 201120390991U CN 202231928 U CN202231928 U CN 202231928U
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- led
- control device
- brightness control
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Abstract
The utility model discloses a brightness control device of a light emitting diode (LED) light. The brightness control device comprises a signal input circuit, a signal output circuit, a first resistor, a second resistor, a first triode and a second triode, wherein a base of the first triode is connected with a collector of the second triode, the signal input circuit is connected with a circuit between the base of the first triode and the collector of the second triode, one end of the first resistor is connected with the circuit between the base of the first triode and the collector of the second triode, the other end of the first resistor is grounded, an emitter of the first triode is connected with the base of the second triode, one end of the second resistor is connected with a connecting circuit between the emitter of the first triode and the base of the second triode, the other end of the second resistor is grounded, and the signal output circuit is connected with the collector of the first triode. With the adoption of the structure, the brightness control device is simple in overall structure and has a small occupied space, and the cost of components is low, therefore, the brightness control device is low in cost.
Description
Technical field
The utility model relates to voltage regulating device, specifically is LED lamplight brightness control device.
Background technology
LED (Light Emitting Diode), i.e. light-emitting diode, it is a kind of solid-state semiconductor device, it can directly be converted into light to electricity.The heart of LED is a semi-conductive wafer, and an end of wafer is attached on the support, and an end is a negative pole, and the other end connects the positive pole of power supply, makes entire wafer by epoxy encapsulation.Semiconductor wafer is made up of two parts, and a part is a P type semiconductor, occupies an leading position in its hole, the inside, and the other end is a N type semiconductor, mainly is electronics here, but these two kinds of semiconductors just form one " P-N knot " when coupling together between them.When electric current acted on this wafer through lead, electronics will be pushed to the P district, and electronics is with hole-recombination in the P district; Will send energy with the form of photon then; The luminous principle of LED that Here it is, and the color of light wavelength decision light are by forming the decision of P-N knot material.
Along with development of electronic technology, the application of LED in electronic product is more and more general, in electronic products such as automobile, mobile phone; For the brightness that guarantees LED can the deepening with the decline of cell voltage;, the electronic product of LED generally is provided with low pressure difference linear voltage regulator now in being set, yet, low pressure difference linear voltage regulator is set in electronic product; Its space that occupies is big and cost is high, thereby has strengthened the electronic product cost that produces.
The utility model content
The purpose of the utility model is to overcome the deficiency of prior art, and a kind of LED lamplight brightness control device little and that cost is low that takes up space is provided.
The purpose of the utility model mainly realizes through following technical scheme: LED lamplight brightness control device; Comprise signal input line road, output line road, first resistance, second resistance, first triode and second triode; The base stage of said first triode is connected with the collector electrode of second triode; Said signal input line road is connected with circuit between first transistor base and second transistor collector; Said first resistance, one end is connected its other end ground connection with circuit between first transistor base and second transistor collector; The emitter of said first triode is connected with the base stage of second triode, and said second resistance, one end is connected its other end ground connection with connection line between first transistor emitter and second transistor base; Said output line road is connected with the collector electrode of first triode.
The grounded emitter of said second triode.
Said first triode and second triode are the NPN triode.
The utility model is arranged on the pcb board when being provided with.The utility model is when using, and the signal input line road connects the level input, and the output line road connects the negative electrode of LED.The utility model is changed in conducting with between ending through first triode, second triode, thereby guarantees that light can not change to people's naked-eye brightness.
The utility model compared with prior art has the following advantages and beneficial effect: the utility model comprises signal input line road, output line road, first resistance, second resistance, first triode and second triode; The utility model overall structure is simple; Be convenient to realize; It is little to take up space, and the element cost that constitutes the utility model is low, thereby makes that the cost of the utility model is low.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
The pairing name of Reference numeral is called in the accompanying drawing: 1, signal input line road, 2, the output line road, R1, first resistance, R2, second resistance, Q1, first triode, Q2, second triode.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is done further to specify, but the execution mode of the utility model is not limited thereto.
Embodiment:
As shown in Figure 1; LED lamplight brightness control device; Comprise signal input line road 1, output line road 2, first resistance R 1, second resistance R 2, the first triode Q1 and the second triode Q2, wherein, the first triode Q1 and the second triode Q2 are the NPN triode.The base stage of the first triode Q1 is connected with the collector electrode of the second triode Q2; Signal input line road 1 is connected with circuit between the first triode Q1 base stage and the second triode Q2 collector electrode; It connects the level input; First resistance R, 1 one ends are connected first resistance R, 1 other end ground connection with circuit between the first triode Q1 base stage and the second triode Q2 collector electrode.The emitter of the first triode Q1 is connected with the base stage of the second triode Q2, and second resistance R, 2 one ends are connected second resistance R, 2 other end ground connection with connection line between the first triode Q1 emitter and the second triode Q2 base stage.Output line road 2 is connected with the collector electrode of the first triode Q1, and it connects the negative electrode of LED, the grounded emitter of the second triode Q2.
The operation principle of the utility model: when 1 input high level of signal input line road; The first triode Q1 conducting; The negative electrode of LED is because of the conducting ground connection of Q1, and the LED conducting begins luminous, when the first triode Q1 is in conducting state; The base voltage of the second triode Q2 increases, the second triode Q2 conducting.With the direct ground connection of the base stage of the first triode Q1, cause the first triode Q1 to close after the second triode Q2 conducting, LED turn-offs; The second triode Q2 is turned off then, because this moment, control signal was in high level all the time, the second triode Q2 closes and has no progeny; The first triode Q1 opens conducting LED once more; So circulation, according to the switching time of triode, the LED lamp is in high-frequency opening all the time and closes in the closed procedure.
Along with the decline of the cell voltage that connects the LED anode, the drive current of LED diminishes, the brightness deepening of LED when the conducting of LED lamp; But open the shutoff cycle at one in (one-period i.e. two triodes is respectively opened and turn-offed once); The time that LED opens is elongated, and the time that LED turn-offs shortens, and this time is popular; Though brightness deepening during the LED conducting in the one-period; But because the time of LED conducting is elongated, the time that LED turn-offs shortens, and the average brightness of LED is less than changing in fact.Because there are up to a hundred even hundreds of in such cycle in 1 second, people's naked eyes are to discover its flicker, only can think that the brightness of lamp does not change.
As stated, then can well realize the utility model.
Claims (3)
1.LED lamplight brightness control device; It is characterized in that: comprise signal input line road (1), output line road (2), first resistance (R1), second resistance (R2), first triode (Q1) and second triode (Q2); The base stage of said first triode (Q1) is connected with the collector electrode of second triode (Q2); Said signal input line road (1) is connected with circuit between first triode (Q1) base stage and second triode (Q2) collector electrode; Said first resistance (R1) end is connected its other end ground connection with circuit between first triode (Q1) base stage and second triode (Q2) collector electrode; The emitter of said first triode (Q1) is connected with the base stage of second triode (Q2), and said second resistance (R2) end is connected its other end ground connection with connection line between first triode (Q1) emitter and second triode (Q2) base stage; Said output line road (2) is connected with the collector electrode of first triode (Q1).
2. LED lamplight brightness control device according to claim 1 is characterized in that: the grounded emitter of said second triode (Q2).
3. LED lamplight brightness control device according to claim 1 and 2 is characterized in that: said first triode (Q1) and second triode (Q2) are the NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120390991 CN202231928U (en) | 2011-10-14 | 2011-10-14 | Brightness control device of light emitting diode (LED) light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120390991 CN202231928U (en) | 2011-10-14 | 2011-10-14 | Brightness control device of light emitting diode (LED) light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202231928U true CN202231928U (en) | 2012-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120390991 Expired - Fee Related CN202231928U (en) | 2011-10-14 | 2011-10-14 | Brightness control device of light emitting diode (LED) light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202231928U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103052206A (en) * | 2011-10-14 | 2013-04-17 | 成都锐奕信息技术有限公司 | Controller for LED (Light Emitting Diode) luminance |
-
2011
- 2011-10-14 CN CN 201120390991 patent/CN202231928U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103052206A (en) * | 2011-10-14 | 2013-04-17 | 成都锐奕信息技术有限公司 | Controller for LED (Light Emitting Diode) luminance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20141014 |
|
| EXPY | Termination of patent right or utility model |