CN101765259B - LED drive circuit and LED lamp - Google Patents
LED drive circuit and LED lamp Download PDFInfo
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- CN101765259B CN101765259B CN2009101083458A CN200910108345A CN101765259B CN 101765259 B CN101765259 B CN 101765259B CN 2009101083458 A CN2009101083458 A CN 2009101083458A CN 200910108345 A CN200910108345 A CN 200910108345A CN 101765259 B CN101765259 B CN 101765259B
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Abstract
The present invention provides an LED drive circuit and LED lamp, which is applicable to the LED field. The LED drive circuit comprises a power supply unit, a first switch unit, a trigger unit for outputting a continuous impulse control signal, a charge/discharge unit and a second switch unit. The input of the first switch unit is connected with the output of the power supply unit while the output is connected with the control terminal of the trigger unit; the charge/discharge unit is connected with a reset terminal of the trigger unit; the reset terminal of the trigger terminal is reset after the duration of charging or discharging; and the second switch unit controls the switch-on of the LED in virtue of a continuous impulse control signal from the output of the trigger unit so that the LED twinkles. As the LED drive circuit adopts the trigger unit capable of outputting a continuous impulse control signal, the second switch unit controls the switch-on of the LED in virtue of a continuous impulse control signal from the output of the trigger unit to realize twinkle of the LED when the first switch is pressed.
Description
Technical field
The invention belongs to the LED field, relate in particular to a kind of led drive circuit and LED lamp.
Background technology
Switch triggering once can only realize the function of Push And Release in the existing led drive circuit; When pinning switch key for a long time, not changing original initial condition (off state or opening) realizes turn-offing or open function when unclamping button; Perhaps ought press down changing original initial condition in a flash immediately but press afterwards and keeping the functional status opposite in time of button of switch key, unclamp behind the button the also maintenance functional status opposite with initial condition with initial condition.Therefore, existing led drive circuit does not have flashing function, and through Realization of Analog Circuit constant current output, causes output current unstable.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of led drive circuit with flashing function.
The embodiment of the invention is achieved in that a kind of led drive circuit, and said led drive circuit comprises:
Power subsystem, first switch element, the trigger element that is used to export the consecutive pulses control signal, charge/discharge unit and second switch unit;
The input of said second switch unit is connected to the output of said power subsystem, and the output of said second switch unit connects LED;
The input of said first switch element is connected to the output of said power subsystem, and the output of said first switch element is connected to the control end of said trigger element, and the output of said trigger element is connected to the control end of said second switch unit;
Said charge/discharge unit is connected to the reset terminal of said trigger element, through making the reset terminal of said trigger element reset after charging interval or discharge time;
Thereby the conducting that said LED is controlled through the consecutive pulses control signal of the output output of said trigger element in said second switch unit makes said LED realize flashing function;
Said trigger element further comprises: first trigger, second trigger and unidirectional breakover element; The control end of said first trigger is connected with said first switch element, and second output of said first trigger is connected to the control end of said first trigger through said unidirectional breakover element; First output of said first trigger is connected to the control end of said second trigger; First output of said second trigger is connected with the control end of said second switch unit; The set end ground connection of said first trigger, the clear terminal of said first trigger is connected to the output of said power subsystem; Second output of said second trigger is connected to the clear terminal of said second trigger, the reset terminal ground connection of said second trigger, the set end ground connection of said second trigger; The reset terminal of said first trigger connects said charge/discharge unit;
Said charge/discharge unit further comprises: first resistance and first electric capacity; One end ground connection of said first electric capacity; The other end of said first electric capacity is connected to the reset terminal of said first trigger, and the other end of said first electric capacity also is connected to first output of said first trigger through said first resistance.
Wherein, said unidirectional breakover element is a diode, and the negative electrode of said diode is connected to second output of said first trigger, and the anode of said diode is connected to the control end of said first trigger.
Wherein, said second switch unit is a metal-oxide-semiconductor, and the source electrode of said metal-oxide-semiconductor is connected to the output of said power subsystem, and the grid of said metal-oxide-semiconductor is connected to the output of said trigger element, and the drain electrode of said metal-oxide-semiconductor connects LED.
Wherein, said led drive circuit also comprises: biasing resistor, and the one of which end is connected to the output of said power subsystem, and the other end is connected to first output of said second trigger.
Wherein, Said led drive circuit also comprises: be connected to first divider resistance and second divider resistance between said first switch element and the ground successively, the end that is connected in series of said first divider resistance and said second divider resistance is connected to the control end of said first trigger.
Wherein, said first switch element is manual touch-switch.
Wherein, said led drive circuit also comprises: the constant current unit, and its input is connected to the output of said second switch unit, and the output of said constant current unit connects said LED, and being used to control the electric current that inputs to said LED is constant current.
The purpose of the embodiment of the invention also is to provide a kind of LED lamp, and it comprises LED and the luminous led drive circuit of driving LED, and said led drive circuit adopts above-mentioned led drive circuit.
The led drive circuit that the embodiment of the invention provides adopts the trigger element that can export the consecutive pulses control signal; When the switch element of winning is pressed, thereby the conducting that LED is controlled through the consecutive pulses control signal of this trigger element output in the second switch unit makes LED realize flashing function; Adopt the constant current unit to make the LED stabilized illumination simultaneously.
Description of drawings
Fig. 1 is the modular structure sketch map of the led drive circuit that provides of the embodiment of the invention;
Fig. 2 is the circuit diagram of the led drive circuit that provides of the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The led drive circuit that the embodiment of the invention provides carries out pulse control through the bistable state multi resonant that is used to export the consecutive pulses control signal trigger element that shakes to the second switch unit, thereby adopting charge/discharge unit to make simultaneously to automatically reset through trigger element after charging interval or discharge time makes LED realize flashing function.
The modular structure of the led drive circuit that the embodiment of the invention provides is as shown in Figure 1, for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Led drive circuit comprises: power subsystem 1, first switch element 2, be used to export trigger element 3, charge/discharge unit 4 and the second switch unit 5 of consecutive pulses control signal; Wherein, the input of second switch unit 5 is connected to the output of power subsystem 1, and the output of second switch unit 5 connects LED6; The input of first switch element 2 is connected to the output of power subsystem 1, and the output of first switch element 2 is connected to the control end of trigger element 3, and the output of trigger element 3 is connected to the control end of second switch unit 5; Charge/discharge unit 4 is connected to the reset terminal of trigger element 3, through making the reset terminal of trigger element 3 reset after charging interval or discharge time; Thereby second switch unit 5 makes LED6 realize flashing function through the conducting of the consecutive pulses control signal control LED6 of the output output of trigger element 3.
In embodiments of the present invention, led drive circuit also comprises constant current unit 7, and its input is connected to the output of second switch unit 5, and the output of constant current unit 7 connects LED6, and being used to control the electric current that inputs to LED6 is constant current; Make the entire circuit simple and stable.As one embodiment of the present of invention, constant current unit 7 can adopt the SB42351NA chip, makes the electric current of second switch unit 5 output carry out constant current control through the SB42351NA chip to LED6, makes the LED6 stabilized illumination.
Led drive circuit that the embodiment of the invention provides adopts the shake logic function of trigger element of bistable state multi resonant, and when the switch element of winning was pressed, LED realized flashing function.
Fig. 2 shows the circuit diagram of the led drive circuit that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
In embodiments of the present invention, unidirectional breakover element 33 is diode D2, and wherein, the negative electrode of diode D2 is connected to second output 15 of first trigger 31, and the anode of diode D2 is connected to the control end 11 of first trigger 31.
In embodiments of the present invention; Charge/discharge unit 4 further comprises: first resistance R 3 and first capacitor C 3; Wherein, The other end that one end ground connection of first capacitor C 3, the other end of first capacitor C 3 are connected to reset terminal 16, the first capacitor C 3 of first trigger 31 also is connected to first output 14 of first trigger 31 through first resistance R 3.
As one embodiment of the present of invention, second switch unit 5 can be any switch elements such as transistor, metal-oxide-semiconductor; In embodiments of the present invention, second switch unit 5 is metal-oxide-semiconductor T2, and wherein the source electrode of metal-oxide-semiconductor T2 is connected to the output of power subsystem 1, and the grid of metal-oxide-semiconductor T2 is connected to the output of trigger element 3, and the drain electrode of metal-oxide-semiconductor T2 connects LED6.
In embodiments of the present invention, led drive circuit also comprises: biasing resistor R8, and the one of which end is connected to the output of power subsystem 1, and the other end is connected to first output 24 of second trigger 32.
In embodiments of the present invention; Led drive circuit also comprises: be connected to the first divider resistance R1 and the second divider resistance R2 between first switch element 2 and the ground successively; Wherein, the end that is connected in series of the first divider resistance R1 and the second divider resistance R2 is connected to the control end 11 of first trigger 31.
As one embodiment of the present of invention; First switch element 2 can be manual touch-switch S1; Wherein, manually the end of touch-switch S1 is connected to the output of power subsystem 1, and manually the other end of touch-switch S1 is connected to the control end 11 of first trigger 31 through the first divider resistance R1.
In embodiments of the present invention, led drive circuit also comprises: filter capacitor C1, C2, C4, C5, and wherein, an end of capacitor C 1 is connected to the output of power subsystem 1, other end ground connection; Capacitor C 2 is connected to being connected in series between end and the ground of the first divider resistance R1 and the second divider resistance R2; Capacitor C 4 is connected between first output 24 and ground of second trigger 32; Capacitor C 5 is connected between the output and ground of second switch unit 5.
In embodiments of the present invention; Power subsystem 1 comprises: secondary cell B, diode D1, and wherein secondary cell B can charge through charge port J, and the negative electrode of diode D1 is connected to the anode of secondary cell B; The anode of diode D1 connects charge port J, and diode D1 is used to prevent reverse charging.
Combine Fig. 2 that the operation principle of the led drive circuit that the embodiment of the invention provides is detailed: to press touch-switch S1 at present; Press control end 11 one the rising edges triggering control signal of following moment to first trigger 31; Make first output 14 of first trigger 31 put 1; Second output 15 is put 0 and is made diode D2 conducting, thereby has dragged down the port voltage of the control end 11 of first trigger 31, makes the trailing edge logic not change.First output 14 of first trigger 31 puts 1 makes the control end 21 of second trigger 32 produce a rising edge triggering control signal, thereby makes control end 21 negates of second trigger 32, thereby has realized the pulse control to metal-oxide-semiconductor T2.Simultaneously; Because the effect of first resistance R 3 and first capacitor C 3; Thereby the reset terminal of first trigger 31 is put 1 the trigger 31 of winning is resetted behind charging interval or the discharge time τ; First output 14 of first trigger 31 is put 0 and second output 15 and is put 1, and then the control end 21 of second trigger 32 obtains trailing edge and triggers control signal, thereby the control end of first trigger 31 is put 1 and obtained a rising edge and trigger control signal when diode D2 oppositely ends; Circulate repeatedly with this and to make LED6 realize flashing function.
The led drive circuit that the embodiment of the invention provides carries out pulse control through trigger element to the second switch unit, adopts charge/discharge unit to make simultaneously and automatically resets through trigger element after charging interval or discharge time, thereby make LED realize flashing function.In embodiments of the present invention, first trigger 31 and second trigger 32 can be integrated in the IC chip, thereby make circuit simple, and be reliable; Help enhancing productivity.
The led drive circuit that the embodiment of the invention provides is arranged in a metallic shield, make electromagnetic interference (Electromagnetic Interference, EMI) low.
The led drive circuit that the embodiment of the invention provides adopts the trigger element that can export the consecutive pulses control signal; When the switch element of winning is pressed, thereby the conducting that LED is controlled through the consecutive pulses control signal of this trigger element output in the second switch unit makes LED realize flashing function; Adopt the constant current unit to make the LED stabilized illumination simultaneously.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a led drive circuit is characterized in that, said led drive circuit comprises:
Power subsystem, first switch element, the trigger element that is used to export the consecutive pulses control signal, charge/discharge unit and second switch unit;
The input of said second switch unit is connected to the output of said power subsystem, and the output of said second switch unit connects LED;
The input of said first switch element is connected to the output of said power subsystem, and the output of said first switch element is connected to the control end of said trigger element, and the output of said trigger element is connected to the control end of said second switch unit;
Said charge/discharge unit is connected to the reset terminal of said trigger element, through making the reset terminal of said trigger element reset after charging interval or discharge time;
Thereby the conducting that said LED is controlled through the consecutive pulses control signal of the output output of said trigger element in said second switch unit makes said LED realize flashing function;
Said trigger element further comprises:
First trigger, second trigger and unidirectional breakover element;
The control end of said first trigger is connected with said first switch element, and second output of said first trigger is connected to the control end of said first trigger through said unidirectional breakover element; First output of said first trigger is connected to the control end of said second trigger; First output of said second trigger is connected with the control end of said second switch unit;
The set end ground connection of said first trigger, the clear terminal of said first trigger is connected to the output of said power subsystem;
Second output of said second trigger is connected to the clear terminal of said second trigger, the reset terminal ground connection of said second trigger, the set end ground connection of said second trigger;
The reset terminal of said first trigger connects said charge/discharge unit;
Said charge/discharge unit further comprises: first resistance and first electric capacity; One end ground connection of said first electric capacity; The other end of said first electric capacity is connected to the reset terminal of said first trigger, and the other end of said first electric capacity also is connected to first output of said first trigger through said first resistance.
2. led drive circuit as claimed in claim 1; It is characterized in that; Said unidirectional breakover element is a diode, and the negative electrode of said diode is connected to second output of said first trigger, and the anode of said diode is connected to the control end of said first trigger.
3. led drive circuit as claimed in claim 1; It is characterized in that said second switch unit is a metal-oxide-semiconductor, the source electrode of said metal-oxide-semiconductor is connected to the output of said power subsystem; The grid of said metal-oxide-semiconductor is connected to the output of said trigger element, and the drain electrode of said metal-oxide-semiconductor connects LED.
4. led drive circuit as claimed in claim 1 is characterized in that, said led drive circuit also comprises:
Biasing resistor, the one of which end is connected to the output of said power subsystem, and the other end is connected to first output of said second trigger.
5. led drive circuit as claimed in claim 1; It is characterized in that; Said led drive circuit also comprises: be connected to first divider resistance and second divider resistance between said first switch element and the ground successively, the end that is connected in series of said first divider resistance and said second divider resistance is connected to the control end of said first trigger.
6. led drive circuit as claimed in claim 1 is characterized in that, said first switch element is manual touch-switch.
7. led drive circuit as claimed in claim 1 is characterized in that, said led drive circuit also comprises:
The constant current unit, its input is connected to the output of said second switch unit, and the output of said constant current unit connects said LED, and being used to control the electric current that inputs to said LED is constant current.
8. LED lamp, it comprises LED and drives the luminous led drive circuit of said LED that it is characterized in that, said led drive circuit adopts each described led drive circuit of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101083458A CN101765259B (en) | 2009-06-19 | 2009-06-19 | LED drive circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101083458A CN101765259B (en) | 2009-06-19 | 2009-06-19 | LED drive circuit and LED lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101765259A CN101765259A (en) | 2010-06-30 |
| CN101765259B true CN101765259B (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101083458A Active CN101765259B (en) | 2009-06-19 | 2009-06-19 | LED drive circuit and LED lamp |
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| CN (1) | CN101765259B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956901B (en) * | 2010-07-20 | 2012-08-01 | 海洋王照明科技股份有限公司 | Indicating lamp and automatic starting method thereof |
| CN102468068A (en) * | 2010-11-04 | 2012-05-23 | 浙江万盛电气有限公司 | Light touch electronic power switch circuit |
| CN104684172A (en) * | 2013-11-28 | 2015-06-03 | 海洋王（东莞）照明科技有限公司 | Lamp flash drive control circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516534A (en) * | 2003-01-09 | 2004-07-28 | 陈有毅 | Centrally-controlled double-mode automatic switch and application scheme of it in building illumination |
| CN1874634A (en) * | 2006-06-09 | 2006-12-06 | 姚荣湘 | Controllable LED illuminator, and method for controlling luminescence |
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2009
- 2009-06-19 CN CN2009101083458A patent/CN101765259B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516534A (en) * | 2003-01-09 | 2004-07-28 | 陈有毅 | Centrally-controlled double-mode automatic switch and application scheme of it in building illumination |
| CN1874634A (en) * | 2006-06-09 | 2006-12-06 | 姚荣湘 | Controllable LED illuminator, and method for controlling luminescence |
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| CN101765259A (en) | 2010-06-30 |
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