CN102348304A - Light-emitting diode batch dimming and switch control combined circuit - Google Patents
Light-emitting diode batch dimming and switch control combined circuit Download PDFInfo
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- CN102348304A CN102348304A CN201010243042XA CN201010243042A CN102348304A CN 102348304 A CN102348304 A CN 102348304A CN 201010243042X A CN201010243042X A CN 201010243042XA CN 201010243042 A CN201010243042 A CN 201010243042A CN 102348304 A CN102348304 A CN 102348304A
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Abstract
The invention provides a light-emitting diode (LED) batch dimming and switch control combined circuit. The dimming circuit comprises a PWM (Pulse-Width Modulation) input terminal, a DATA input terminal, a CLK (clock) input terminal, an EN (enabling) input terminal, a 6B595 chip, five pull-up resistors, eight current limiting resistors and eight light-emitting diodes. Because a PWM dimming mode based on the 6B595 chip is adopted for the circuit disclosed by the invention, the circuit is simplified and can used for the batch dimming and switch control of the small-power LED.
Description
Technical field
The present invention relates to automation field, relate in particular to the circuit that the light modulation of a kind of light-emitting diode batch combines with switch control.
Background technology
Light-emitting diode abbreviates LED as.The voltage of LED, electric current and brightness are not linear proportionate relationship, reach certain voltage, and LED is just bright, reaches certain electric current, and LED just reaches certain brightness.LED is used as light source, indicator light, information display in photoelectric control equipment, perhaps form literal or numeral demonstration.In the modern industry control procedure, a large amount of photoelectric control equipments relate to light modulation, and wherein many photoelectric control equipments relate to batch light modulation and the switch control of LED.
For the batch light modulation of LED, two kinds of modes are arranged roughly at present: the one, adopt linear stabilized power supply to regulate the electric current of LED, the power loss of this dimming mode is bigger; Another kind is to adopt the pulse width modulation light modulation; Abbreviate the PWM light modulation as; The PWM light modulation is the switching frequency of adjustment LED; The frequency of Push And Release is different; The brightness of LED is just different; The PWM light modulation is that cycle and duty cycle are set, to change the mean values of light output than the high operating frequency of human eye identification frequency.PWM light modulation in the market only is applied to the light modulation of equipment, can not be applied to the switch control of equipment simultaneously, and circuit is complicated.
Summary of the invention
Goal of the invention: the objective of the invention is to design a kind of simplification circuit of the PWM of employing dimming mode, the batch light modulation that can be used for low-power LED is controlled the circuit that combines with switch.
Technical scheme: in order to solve the problems of the technologies described above; The present invention has designed a kind of LED light adjusting circuit in batches, comprises PWM input, DATA input, CLK input, EN input, 6B595 chip, five pull-up resistors of R1-R5, eight 10K current-limiting resistances of R10-R17, eight LED.PWM input, DATA input, CLK input, EN input insert the 6B595 chip through four 2K pull-up resistors of R1-R4 with signal, and the 6B595 chip connects eight LED, and eight LED are connected to+the 5V power supply through eight 10K current-limiting resistances of R10-R17.
Beneficial effect: because the present invention adopts the PWM dimming mode based on the 6B595 chip, make circuit reduction, can be used for the batch light modulation and the switch control of low-power LED.
Description of drawings
Shown in Figure 1 is circuit theory Fig. 1 of the present invention
Shown in Figure 2 is circuit theory Fig. 2 of the present invention
Shown in Figure 3 is circuit reduction block diagram of the present invention
Shown in Figure 4 is 6B595 chip operation schematic diagram of the present invention
Embodiment
As shown in Figure 1; " PWM IN " is the input of external dimmer pwm signal; " DATA IN " is the input of (32) 6B595 chip dateout; " CLK IN " is the input of (32) 6B595 chip bus clock; " EN IN " is the input of (32) 6B595 chip output enable, and these four inputs insert (32) 6B595 chip through four pull-up resistors of R1-R4 with signal.(32) (1) of 6B595 chip, (20) pin are empty pin; (2) pin, (19) pin are 5V power input mouth; (3) pin is the data inputs; (8) pin is removed pin for register C1; (9) pin is the PWM input; (10), (11) pin ground connection; (12) pin is the output enable input; (13) pin is the clock input; (18) pin is the data outputs; (4)-(7), eight pins in (14)-(17) are the state output end mouth, they are connected to the negative electrode of eight LED, the anode of eight LED is connected to+the 5V power supply through eight 10K current-limiting resistances of R10-R17.
As shown in Figure 2; (18) pin of (32) 6B595 chip is connected to (3) pin of (34) 6B595 chip among Fig. 2 among Fig. 1; Data have so just been accomplished by of the transmission of (32) 6B595 chip to (34) 6B595 chip; This moment, light adjusting circuit extended to 16 tunnel output and light modulation by 8 the tunnel; And can continue expansion according to this, realize light modulation in batches.
As shown in Figure 3; (31) among the figure are signal input part; It comprises, and PWM imports, DATA imports, CLK imports, EN imports four input ports; PWM is input as outside PWM dim signal input control port; Its excess-three port is that spi bus is used for each port way of output of control (32) 6B595 chip, and the 6B595 chip connects (33) eight LED.
Like Fig. 1, Fig. 3, shown in Figure 4; (32) (9) pin of 6B595 chip is the PWM input; After the PWM dim signal inserts this pin; Arrive and door via not gate; Carry out " & " logical operation with eight signals of output register " C2 ", if eight signals of this moment " C2 " are output as " 1 ", PWM is output as " 0 "; Then " DRAIN0 ~ DRAIN7 " output " 1 " this moment, (33) eight LED that are connected on these eight pins are bright.If eight signals of this moment " C2 " are output as " 1 ", PWM is output as " 1 ", then " DRAIN0 ~ DRAIN7 " output " 0 " this moment, and (33) eight LED that are connected on these eight pins go out.Can infer that in view of the above when " C2 " exports all be " 1 ", then (33) eight LED are bright in PWM output " 0 ", and PWM output " 1 " then (33) eight LED is gone out.Just can control bright, the time scale of going out of (33) eight LED lamps through the duty ratio of control PWM, thereby realize light modulation simultaneously (33) eight LED.
(32) (3) pin of 6B595 chip inserts the serial shift data, and carries out " & " computing according to the state of these data with the pwm signal that (9) pin inserts, and the on off state of control " DRAIN0 ~ DRAIN7 " eight output ports is to realize switch control.
Thus, (32) 6B595 chip has been realized the function of the batch light modulation and the switch control of " DRAIN0 ~ DRAIN7 " eight output ports simultaneously according to (9) pin and the signal that (3) pin inserts.
Claims (4)
1. a light-emitting diode light modulation and the circuit that switch control combines in batches comprises PWM input, DATA input, CLK input, EN input, 6B595 chip, five 2K pull-up resistors of R1-R5, eight 10K current-limiting resistances of R10-R17, eight LED; PWM input, DATA input, CLK input, EN input insert the 6B595 chip through four pull-up resistors of R1-R4 with signal, and the 6B595 chip connects eight LED, and eight LED are connected to+the 5V power supply through eight 10K current-limiting resistances of R10-R17.
2. a kind of light-emitting diode according to claim 1 light modulation is in batches controlled the circuit that combines with switch; It is characterized in that; PWM is input as outside PWM dim signal input control port, and DATA input, CLK input, three ports of EN input are that spi bus is used to control each port way of output of 6B595 chip.
3. a kind of light-emitting diode according to claim 1 light modulation is in batches controlled the circuit that combines with switch; It is characterized in that; (32) (4) of 6B595 chip-(7), eight pins in (14)-(17) are the state output end mouth; They are connected to the negative electrode of eight LED, and the anode of eight LED is connected to+the 5V power supply through eight 10K current-limiting resistances of R10-R17.
4. a kind of light-emitting diode according to claim 1 is light modulation and the circuit that switch control combines in batches, it is characterized in that (18) pin of (32) 6B595 chip can be connected to (3) pin of (34) 6B595 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010243042XA CN102348304A (en) | 2010-08-03 | 2010-08-03 | Light-emitting diode batch dimming and switch control combined circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010243042XA CN102348304A (en) | 2010-08-03 | 2010-08-03 | Light-emitting diode batch dimming and switch control combined circuit |
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| Publication Number | Publication Date |
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| CN102348304A true CN102348304A (en) | 2012-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010243042XA Pending CN102348304A (en) | 2010-08-03 | 2010-08-03 | Light-emitting diode batch dimming and switch control combined circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115334A (en) * | 2007-08-30 | 2008-01-30 | 华南理工大学 | PWM control signal generating method of series multi-pixel LED lamp |
| WO2008129504A1 (en) * | 2007-04-24 | 2008-10-30 | Philips Intellectual Property & Standards Gmbh | Led string driver with shift register and level shifter |
| CN201904941U (en) * | 2010-08-03 | 2011-07-20 | 镇江市亿华系统集成有限公司 | Circuit combining light-emitting diode dimming in batch with switch control |
-
2010
- 2010-08-03 CN CN201010243042XA patent/CN102348304A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008129504A1 (en) * | 2007-04-24 | 2008-10-30 | Philips Intellectual Property & Standards Gmbh | Led string driver with shift register and level shifter |
| CN101115334A (en) * | 2007-08-30 | 2008-01-30 | 华南理工大学 | PWM control signal generating method of series multi-pixel LED lamp |
| CN201904941U (en) * | 2010-08-03 | 2011-07-20 | 镇江市亿华系统集成有限公司 | Circuit combining light-emitting diode dimming in batch with switch control |
Non-Patent Citations (1)
| Title |
|---|
| 翟震,张春玲: "用74HC595芯片驱动LED的电路设计", 《机床与液压》 * |
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Application publication date: 20120208 |