CN202713692U - Dimming circuit of light-emitting diode unit - Google Patents
Dimming circuit of light-emitting diode unit Download PDFInfo
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- CN202713692U CN202713692U CN 201220214392 CN201220214392U CN202713692U CN 202713692 U CN202713692 U CN 202713692U CN 201220214392 CN201220214392 CN 201220214392 CN 201220214392 U CN201220214392 U CN 201220214392U CN 202713692 U CN202713692 U CN 202713692U
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- emitting diode
- light
- control
- light emitting
- switching device
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Abstract
The utility model provides a dimming circuit of a light-emitting diode unit, and relates to the field of light-emitting diode dimming technology. The dimming circuit comprises a control unit and a driving unit, wherein the control unit comprises at least two paths of control circuits parallelly connected with each other; the control circuit comprises a switch component and a resistor; one end of the switch component is connected with the light-emitting diode unit and the other end is grounded via the resistor; the driving unit is used for controlling whether the switch component is conducted or not; and the driving unit is connected with the switch component. With the dimming circuit of the light-emitting diode unit, control and description of the peak current of the light emitting diode can be realized in the dimming process.
Description
Technical field
The utility model relates to light-emitting diode (LED) light regulating technology field, is specifically related to a kind of light adjusting circuit of light emitting diode.
Background technology
Utilize at present pulse width modulation (PWM) signal to the common practices that LED carries out light modulation to be: to utilize the control integration circuit (IC) of LED to carry out as shown in Figure 1 light modulation.Among Fig. 1,5 LED of the first series connection become one group of LED unit successively, wherein the anode of D1 will be connected to external power source, the negative electrode of D5 is connected to a metal oxide layer semiconductor field-effect transistor (MOSFET), the for example drain electrode of N-type metal-oxide-semiconductor (NMOS) Q, the source electrode of Q is by resistance R ground connection (GND), and the grid of Q is connected to the pin two of drive IC.Among Fig. 1, the pin one of drive IC, 3 also is connected to respectively drain electrode and the source electrode of Q.
The 2nd pin of drive IC applies a pwm signal to the grid of Q among Fig. 1, utilize the time that pwm signal can the opening and closing of control switch device Q in one-period, namely can recently realize by the duty of regulating pwm signal the control of LED average current in the one-period.The average current I of LED in one-period
AvgCan calculate according to following formula:
I
avg=I
max*（T
on/(T
on+T
off)）
I wherein
MaxBe peak current, T
OnBe the opening time of Q in one-period, T
OffBe the turn-off time of Q in one-period, a kind of possible LED current waveform as shown in Figure 2, the opening time T of Q among Fig. 2
OnWith shut-in time T
OffAccounting in one-period is respectively 30% and 70%.
The above-mentioned light-dimming method of prior art is although can pass through to regulate the duty ratio of pwm signal to the average current I of LED
AvgRegulate, but still can't be to peak current I
MaxPortray, particularly in one-period, can not change I
MaxSize, therefore so that the dimmer application in the LED-backlit source limited to.
The utility model content
The purpose of the utility model embodiment provides a kind of light adjusting circuit of light emitting diode, can realize control and the portrayal of the peak current of light-emitting diode in the light modulation process.
For solving the problems of the technologies described above, embodiment more of the present utility model provide a kind of light adjusting circuit of light emitting diode,
A kind of light adjusting circuit of light emitting diode, described light emitting diode comprises at least one light-emitting diode, described light adjusting circuit comprises:
Control unit, described control unit comprise at least two-way control circuit parallel with one another, and described control circuit includes a switching device and a resistance, and an end of described switching device is connected to described light emitting diode, and the other end is by described grounding through resistance;
Be used for controlling described switching device conducting whether driver element, described driver element is connected with described switching device.
According to embodiment more of the present utility model, described driver element is exported respectively corresponding conducting control signal to the described switching device in the control circuit more than the two-way, and described conducting control signal is so that exist common factor between the ON time of plural described switching device.
According to embodiment more of the present utility model, described switching device is a metal-oxide-semiconductor, and the output of described driver element is opened or closed to control described metal-oxide-semiconductor as the pulse width modulating signal of the conducting control signal grid to described metal-oxide-semiconductor.
According to embodiment more of the present utility model, described metal-oxide-semiconductor is the NOMS pipe, and the drain electrode of described NMOS pipe is connected to described light emitting diode, and source electrode is by described grounding through resistance.
According to embodiment more of the present utility model, described metal-oxide-semiconductor is PMOS pipe, and the source electrode of described PMOS pipe is connected to described light emitting diode, and drain electrode is by described grounding through resistance.
According to embodiment more of the present utility model, described light emitting diode is connected to a power supply, is powered by described power supply.
According to embodiment more of the present utility model, described driver element comprises:
One voltage detecting pin is connected to the input of described control circuit;
Be used for the input voltage according to the described control circuit that detects on the described voltage detecting pin, control the control module of described driver element operating state.
Can find out from the above, the light adjusting circuit of the light emitting diode that the utility model provides, can be so that by the switching device of opening varying number and/or the size of regulating the resistance on each control circuit, regulate the size of current of light emitting diode, thereby realize control and portrayal to the peak current of light emitting diode.
Description of drawings
Fig. 1 is the schematic diagram of light adjusting circuit of the light emitting diode of prior art;
Fig. 2 is the current diagram of light adjusting circuit of the light emitting diode of prior art;
The schematic diagram of a kind of light adjusting circuit that Fig. 3 provides for the utility model embodiment;
The current diagram of a kind of light adjusting circuit that Fig. 4 provides for the utility model embodiment;
The structural representation of a kind of power supply of the light emitting diode that Fig. 5 provides for the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the accompanying drawings and the specific embodiments the utility model is described in detail.
Please refer to Fig. 3, the light adjusting circuit that present embodiment provides is applied to the light modulation to light emitting diode 31.Among the utility model embodiment, an end of light emitting diode 31 is connected to power supply, and the other end is connected to control unit 32.This power supply specifically can be constant voltage source or constant-current supply.
This light emitting diode 31 can comprise at least one light-emitting diode.When this light emitting diode comprises light-emitting diode more than 2, these light-emitting diodes specifically can be as shown in Figure 3, join end to end successively, the anode of a light-emitting diode after the negative electrode that is connected into a string light-emitting diode D1 ~ D5(and is last light-emitting diode is connected to), wherein the anodic bonding of D1 is to outside power supply.Can also adopt other connected modes in parallel or string and mixing between this light-emitting diode, present embodiment is not done closed restriction to this.
As shown in Figure 3, the light adjusting circuit of present embodiment comprises:
Among Fig. 3, shown in control unit 32 only comprise two control circuits, in concrete the application, control unit 32 also can comprise the control circuit more than 3 or 3.
Among Fig. 3, described driver element 33 can be exported respectively corresponding conducting control signal to the described switching device in the control circuit more than the two-way, and these conducting control signals can be occured simultaneously so that exist between the ON time of plural described switching device.Please refer to Fig. 4, show a kind of ON time and have the situation of occuring simultaneously.Wherein, when only opening Q1 all the time light emitting diode 31 the peak value of electric current 41 be 350mA; When only opening Q2 all the time light emitting diode 31 the peak value of electric current 42 also for 350mA; When there is common factor (opening simultaneously in front 15% period in each cycle such as Fig. 4) in the opening time of Q1 and Q2, light emitting diode 31 the peak value of electric current 43 can reach 700mA, and therein only the period light emitting diode 31 opened of switching device the peak value of electric current 43 can be 350mA, this shows light emitting diode 31 the controlled and portrayal of peak current.
By above structure, when the switching device in control circuit was opened, light emitting diode will be by control circuit ground connection in the present embodiment.Like this, can be by the switching device of opening varying number and/or the size of regulating the resistance on each control circuit, the load of control light emitting diode, and then the size of current of regulating light emitting diode, so present embodiment can be by control and the portrayal of driver element 33 realizations to the peak current of light emitting diode.
Among Fig. 3, switching device Q1, Q2 can adopt metal-oxide-semiconductor, such as NMOS pipe or PMOS pipe.Driver element 33 has pin one ~ 6, and wherein pin two and pin 5 are connected to respectively the grid of corresponding metal-oxide-semiconductor, controls signal to grid with the output conducting, the unlatching of the metal-oxide-semiconductor that control is corresponding or close.
For example, Fig. 3 shows the connected mode when adopting the NMOS pipe as switching device Q1/Q2, and wherein, the drain electrode of NMOS pipe is connected to described light emitting diode 31, and source electrode is by described resistance R 1/R2 ground connection, and grid is connected to described driver element 33.The conducting control signal preferably adopts pulse-width modulation (PWM) signal, and the NMOS pipe is opened when pulse-width signal is in high level, corresponding control circuit conducting; The NMOS pipe is closed when pulse-width signal is in low level, and corresponding control circuit disconnects.
Certainly, present embodiment also can adopt the PMOS pipe as switching device Q1/Q2, and at this moment, the source electrode of PMOS pipe is connected to described light emitting diode 31, and drain electrode is by described resistance R 1/R2 ground connection, and grid is connected to described driver element 33.
Among Fig. 3, driver element 33 can also be realized extra detection control function, for example, voltage detecting pin one and 4 by driver element 33, be connected to the input of control circuit 321 and 322, specifically can be connected to respectively the drain electrode of switching device Q1 and Q2, in order to detect the load voltage of led circuit.At this moment; described driver element 33 can also comprise a control module; in order to the load voltage according to the described led circuit that detects on the described voltage detecting pin; control described driver element operating state; for example when described load voltage does not meet preset standard; realize predetermined break protecting, etc.
Among Fig. 3, driver element 33 can also be set by pin 3 current potential of resistance R 1, sets the current potential of resistance R 2 by pin 6, and then controls the size that flows through the led circuit electric current.
Fig. 5 shows the structure of the power subsystem of light emitting diode 31 power supplies that can be used to the utility model embodiment.The DC input voitage of the input reception+24V of this power subsystem, this input voltage inputs to an inductance (L_P) by fuse (Fuse 1) and some filter capacitors (C_P1, C_P2, C_P5); Diode D_P, high frequency switching device Q_P, capacitor C _ POUT1 ~ C_POUT3 consist of a booster circuit, and its output is connected to light emitting diode, such as the anode of the diode D1 among Fig. 3.The voltage V_PLED of output output, a feedback circuit that consists of by resistance R _ P8, R_P6 and R_P5 feeds back to the feedback pin FB of a power supply chip U_P, and the GDRV pin of power supply chip U_P is used for the control signal of control high frequency switching device Q_P switch via resistance R _ P1 output.Other pins of power supply chip U_P also consist of the peripheral circuit of power supply chip by R_P1, R_P4, R_P7, C_P3, C_P4, C_P6, C_P7, C_P8 and C_P9 etc.Circuit structure shown in Figure 5 can be realized the output of a constant-current supply, for light emitting diode is powered.
Can find out from the above, the utility model embodiment can utilize principle of stacking, the optical diode unit is controlled with the multichannel control circuit with riches all the way, thereby can utilize the Overlay of the pwm signal of multichannel, realizes portrayal and the control of the peak current of light-emitting diode in the one-period.
Claims (6)
1. the light adjusting circuit of a light emitting diode, described light emitting diode comprises at least one light-emitting diode, it is characterized in that, described light adjusting circuit comprises:
Control unit, described control unit comprise at least two-way control circuit parallel with one another, and described control circuit includes a switching device and a resistance, and an end of described switching device is connected to described light emitting diode, and the other end is by described grounding through resistance;
Be used for controlling described switching device conducting whether driver element, described driver element is connected with described switching device.
2. light adjusting circuit as claimed in claim 1 is characterized in that,
Described switching device is a metal-oxide-semiconductor, and the output of described driver element is opened or closed to control described metal-oxide-semiconductor as the pulse width modulating signal of the conducting control signal grid to described metal-oxide-semiconductor.
3. light adjusting circuit as claimed in claim 2 is characterized in that,
Described metal-oxide-semiconductor is the NOMS pipe, and the drain electrode of described NMOS pipe is connected to described light emitting diode, and source electrode is by described grounding through resistance.
4. light adjusting circuit as claimed in claim 2 is characterized in that,
Described metal-oxide-semiconductor is PMOS pipe, and the source electrode of described PMOS pipe is connected to described light emitting diode, and drain electrode is by described grounding through resistance.
5. light adjusting circuit as claimed in claim 1 is characterized in that,
Described light emitting diode is connected to a power supply, is powered by described power supply.
6. light adjusting circuit as claimed in claim 1 is characterized in that, described driver element comprises:
One voltage detecting pin is connected to the input of described control circuit;
Be used for the input voltage according to the described control circuit that detects on the described voltage detecting pin, control the control module of described driver element operating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220214392 CN202713692U (en) | 2012-05-11 | 2012-05-11 | Dimming circuit of light-emitting diode unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220214392 CN202713692U (en) | 2012-05-11 | 2012-05-11 | Dimming circuit of light-emitting diode unit |
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| Publication Number | Publication Date |
|---|---|
| CN202713692U true CN202713692U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220214392 Expired - Lifetime CN202713692U (en) | 2012-05-11 | 2012-05-11 | Dimming circuit of light-emitting diode unit |
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| CN (1) | CN202713692U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108575010A (en) * | 2017-07-20 | 2018-09-25 | 常州星宇车灯股份有限公司 | Circuit for lamp before a kind of full LED of integral type single module control |
| CN108811248A (en) * | 2018-06-27 | 2018-11-13 | 北京小米移动软件有限公司 | Light adjusting circuit and lamps and lanterns |
| CN113450700A (en) * | 2020-07-10 | 2021-09-28 | 重庆康佳光电技术研究院有限公司 | Display control method and device, display equipment and electronic equipment |
-
2012
- 2012-05-11 CN CN 201220214392 patent/CN202713692U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108575010A (en) * | 2017-07-20 | 2018-09-25 | 常州星宇车灯股份有限公司 | Circuit for lamp before a kind of full LED of integral type single module control |
| CN108811248A (en) * | 2018-06-27 | 2018-11-13 | 北京小米移动软件有限公司 | Light adjusting circuit and lamps and lanterns |
| CN113450700A (en) * | 2020-07-10 | 2021-09-28 | 重庆康佳光电技术研究院有限公司 | Display control method and device, display equipment and electronic equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130130 |
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| CX01 | Expiry of patent term |