The content of the invention
The embodiment of the present invention provides a kind of LED drive circuit and illuminator, can use the controllable silicon dimmer of electric filament lampLED is dimmed.
Embodiment of the present invention LED drive circuit is specifically included：Regulator rectifier circuit, square wave conversion circuit, PWM output electricityRoad；
Wherein, ac signal is input into the regulator rectifier circuit, and ac signal is changed by the regulator rectifier circuitInto DC signal and high-frequency signal is filtered, export to the square wave conversion circuit, and power for the PWM output circuits, JingThe square-wave signal of the square wave conversion circuit conversion, is input into the PWM output circuits, and the PWM output circuits are according to square waveThe duty of signal when rate-adaptive pacemaker PWM ripples, the PWM ripples control the LED light device work.
Used as a kind of optional embodiment, the regulator rectifier circuit includes：Full-wave bridge rectifier circuit.As one kindOptional embodiment, the regulator rectifier circuit include：4 the first diodes, the second diode D2, the first electric capacity C1, theThree diode D3, the second audion Q2, the 4th resistance R4.
Used as a kind of optional embodiment, described 4 the first diode D1 are in parallel after connecting two-by-two；
The negative electrode of the second diode D2 is connected with the positive pole of the first electric capacity C1；
The minus earth of the first electric capacity C1, the current collection of the positive pole of the first electric capacity C1 and the second audion Q2Pole connects；
The plus earth of the 3rd diode D3, the negative electrode of the 3rd diode D3 and the one of the 4th resistance R4End connection；
The colelctor electrode of the second audion Q2 is connected with the other end of the 4th resistance R4, the second audion Q2Base stage be connected with the negative electrode of the 3rd diode D3.
Used as a kind of optional embodiment, the square wave conversion circuit includes：First resistor R1, second resistance R2, theThree resistance R3, the first audion Q1.
Used as a kind of optional embodiment, one end of first resistor R1 is connected with the anode of the second diode D2Connect, one end of first resistor R1 be connected with the base stage of the first audion Q1 simultaneously and second resistance R2 one endConnection；
The other end ground connection of second resistance R2；
One end of 3rd resistor R3 is connected with the colelctor electrode of the first audion Q1,3rd resistor R3 it is anotherOne end is connected with the emitter stage of the second audion Q2；
The grounded emitter of the first audion Q1.
Used as a kind of optional embodiment, the PWM output circuits include：4th diode D4, the 5th diode D5,The inductance L1 of 6th diode D6, the 3rd audion Q3, the 5th resistance R5, first, the second electric capacity C2 and chip U1.
Used as a kind of optional embodiment, the anode of the 4th diode D4 is simultaneously with the 3rd audion Q3'sOne end connection of colelctor electrode and the first inductance L1, the negative electrode of the 4th diode D4 is simultaneously with the second electric capacity C2'sThe anode connection of positive pole and the 5th diode D5；
The negative electrode of the 5th diode D5 is connected with the anode of the 6th diode D6；
The negative electrode of the 6th diode D6 simultaneously with the negative pole and the first inductance L1 of the second electric capacity C2 oneEnd connection；
The base stage of the 3rd audion Q3 is connected with the 5th foot of the chip U1, the transmitting of the 3rd audion Q3Pole is connected with one end of the 6th foot and the 5th resistance R5 of the chip U1 simultaneously；
The other end ground connection of the 5th resistance R5；
The other end of the first inductance L1 is connected with the negative pole of the second electric capacity C2；
First foot of the chip U1 is simultaneously another with the emitter stage and 3rd resistor R3 of the second audion Q2One end connects, and the 7th foot of the chip U1 is connected with the colelctor electrode of the first audion Q1, the octal of the chip U1Ground connection.
Used as a kind of optional embodiment, the voltage of the DC signal includes 5V.
The present invention also provides a kind of LED light device, including above-described LED drive circuit.
The embodiment of the present invention has the beneficial effect that：
The embodiment of the present invention can be dimmed to LED using the controllable silicon dimmer of electric filament lamp, it is to avoid by electric filament lamp moreThe controllable silicon dimmer of electric filament lamp is caused to waste when changing LED light device into, in addition, can make using LED drive circuit of the present invention, without stroboscopic, non-jitter, brightness ratio is adjustable for LED, strengthens Consumer's Experience.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, completeSite preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than the embodiment of whole.Based on thisEmbodiment in bright, the every other enforcement obtained under the premise of creative work is not made by those of ordinary skill in the artExample, belongs to the scope of protection of the invention.
Fig. 1 is referred to, is embodiment of the present invention LED drive circuit structure figure, embodiment of the present invention LED drive circuit bagInclude：Regulator rectifier circuit 10, square wave conversion circuit 20, PWM output circuits 30.
The operation principle of embodiment of the present invention LED drive circuit is：Wherein, ac signal is input into the rectifying and voltage-stabilizing electricityAc signal is converted into DC signal and filters high-frequency signal by road 10, the regulator rectifier circuit 10, is exported to describedSquare wave conversion circuit 20, and power for the PWM output circuits 30, the square-wave signal of the conversion of square wave conversion circuit 20 described in Jing,Be input into the PWM output circuits 30, the PWM output circuits 30 according to the duty of square-wave signal when rate-adaptive pacemaker PWM ripples,The PWM ripples control the LED light device work.The voltage of embodiment of the present invention DC signal is generally 5V.Needs are knownRoad, can also select other electronic devices and components to realize the LED drive circuit of the present invention.
Fig. 2 is referred to, is another embodiment of the present invention LED drive circuit structure figure, wherein,
Regulator rectifier circuit 10 includes：Full-wave bridge rectifier circuit, certainly, user can select other forms as neededRectification circuit.Regulator rectifier circuit includes：The rectification module of 4 the first diode compositions, the second diode D2 and the first electric capacityThe filtration module of C1 compositions, the 3rd diode D3, the second audion Q2, the Voltage stabilizing module of the 4th resistance R4 compositions, its connection are closedSystem is as follows：
4 the first diode D1 are in parallel after connecting two-by-two, constitute bridge full-wave rectifier module, take IN1 in the rectification moduleIt is input with IN2, sinusoidal ac passes through IN1 and IN2 and is input into LED drive circuit of the present invention, after rectification module rectificationIt is input into filtration module by the anode of the second diode D2 again, certainly, other electronic devices also may be selected, rectification is constitutedModule.
The negative electrode of the second diode D2 is connected with the positive pole of the first electric capacity C1；
The minus earth of the first electric capacity C1, the positive pole of the first electric capacity C1 are connected with the colelctor electrode of the second audion Q2Connect；
The plus earth of the 3rd diode D3, the negative electrode of the 3rd diode D3 are connected with one end of the 4th resistance R4Connect；
The colelctor electrode of the second audion Q2 is connected with the other end of the 4th resistance R4, the base of the second audion Q2Pole is connected with the negative electrode of the 3rd diode D3.
Square wave conversion circuit 20 includes：First resistor R1, second resistance R2,3rd resistor R3, the first audion Q1, its companyConnect relation as follows：
One end of first resistor R1 is connected with the anode of the second diode D2, and one end of first resistor R1 is simultaneously with described theThe base stage connection of one audion Q1 and one end of second resistance R2 connect；
The other end ground connection of second resistance R2；
One end of 3rd resistor R3 is connected with the colelctor electrode of the first audion Q1, the other end of 3rd resistor R3 and instituteState the emitter stage connection of the second audion Q2；
The grounded emitter of the first audion Q1.
PWM output circuits include 30：4th diode D4, the 5th diode D5, the 6th diode D6, the 3rd audionThe inductance L1 of Q3, the 5th resistance R5, first, the second electric capacity C2 and chip U1, its annexation are as follows：
The anode of the 4th diode D4 is connected with one end of the colelctor electrode and the first inductance L1 of the 3rd audion Q3 simultaneously, theThe negative electrode of four diode D4 is connected with the anode of the positive pole and the 5th diode D5 of the second electric capacity C2 simultaneously；
The negative electrode of the 5th diode D5 is connected with the anode of the 6th diode D6；
The negative electrode of the 6th diode D6 is connected with one end of the negative pole and the first inductance L1 of the second electric capacity C2 simultaneouslyConnect；
The base stage of the 3rd audion Q3 is connected with the 5th foot PA2 of the chip U1, and the emitter stage of the 3rd audion Q3 is sameWhen be connected with one end of the 6th foot PA1 and the 5th resistance R5 of chip U1；
The other end ground connection of the 5th resistance R5；
The other end of the first inductance L1 is connected with the negative pole of the second electric capacity C2；
First foot of chip U1 is VDD, the i.e. builtin voltage of chip U1, pin transmitting simultaneously with the second audion Q2The other end connection of pole and 3rd resistor R3, the 7th foot PA0 of chip U1 are connected with the colelctor electrode of the first audion Q1, chip U1Octal VSS ground connection.It should be appreciated that chip U1 can adopt the conjunction Thailand single-chip microcomputer of model HT46R01C, chip U1 adoptCollection flows through the electric current of LED light device, and when the electric current is more than preset value, the 5th foot of chip U1 reduces output duty cycle, whenWhen the electric current is less than preset value, the 5th foot of chip U1 increases output duty cycle, output is reached by the size of the electric current steadyThe purpose of fixed PWM ripples.
In addition, chip U1 is capable of identify that the signal of different controllable silicon dimmers, so as to export stable PWM ripples, LED is controlledIlluminator stabilized illumination, realizes that LED is luminous without stroboscopic, non-jitter, and chip U1 can also control LED by the design to its softwareBrightness ratio, strengthen Consumer's Experience.
The present invention also provides a kind of LED light device, and the LED light device includes above-described LED drive circuit.
The embodiment of the present invention can be dimmed to LED using the controllable silicon dimmer of electric filament lamp, it is to avoid by electric filament lamp moreThe controllable silicon dimmer of electric filament lamp is caused to waste when changing LED light device into, in addition, can make using LED drive circuit of the present invention, without stroboscopic, non-jitter, brightness ratio is adjustable for LED, strengthens Consumer's Experience.
One of ordinary skill in the art will appreciate that all or part of flow process in realizing above-described embodiment method, can beInstruct related hardware to complete by computer program, described program can be stored in a computer read/write memory mediumIn, the program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each method.Wherein, described storage medium can be magneticDish, CD, read-only memory（Read-Only Memory, ROM）Or random access memory（Random AcessMemory, RAM）Deng.
Above disclosed is only present pre-ferred embodiments, and the right model of the present invention can not be limited certainly with thisEnclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope covered by the present invention.