CN102811530A - Voltage-rising type LED driving circuit and lamp - Google Patents
Voltage-rising type LED driving circuit and lamp Download PDFInfo
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- CN102811530A CN102811530A CN2011101477300A CN201110147730A CN102811530A CN 102811530 A CN102811530 A CN 102811530A CN 2011101477300 A CN2011101477300 A CN 2011101477300A CN 201110147730 A CN201110147730 A CN 201110147730A CN 102811530 A CN102811530 A CN 102811530A
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Abstract
The invention is suitable for the field of LEDs, and particularly relates to a voltage-rising type LED driving circuit and a lamp. In the embodiment of the invention, the voltage-rising type LED driving circuit comprises independent elements; single-chips are used for realizing the voltage-rising function through PWM pulse control, and detecting and controlling the current of an LED lamp. The maximum output current can be adjusted by modifying the control program of the single-chips, and the luminance of the LED lamp set can also be adjusted through a light adjusting switch. The voltage-rising type LED driving circuit and the lamp have the advantages of high effect, reliability, low price, simplicity, portability and the like, so as to overcome the defects of constant-current integration.
Description
Technical field
The invention belongs to the LED field, relate in particular to a kind of booster type led drive circuit and light fixture.
Background technology
Along with the continuous development of science and technology, the new product new technology is constantly reformed, and LED is as new type light source; It has energy-saving and environmental protection, characteristics of high efficiency, and technology is ripe and be applied to every field, and LED is widely used as light source; Various led drive circuits also occurred, but LED is very responsive to the height of voltage as constant current device thereupon; When input voltage is lower than LED lamp group rated voltage; LED lamp group just can not be operated in constant current state so, so just need be elevated to LED lamp group rated voltage to voltage, carries out constant-current driving again.Generally adopt the booster type constant current integrated chip to realize at present, though it has advantages such as power consumption is little, reliable and stable, in light weight, there are shortcomings such as complicated circuit, cost height, utilization underaction in it, has brought inconvenience to the user.
Summary of the invention
The object of the present invention is to provide a kind of booster type led drive circuit; Be intended to solve the problem that present booster type led drive circuit exists complicated circuit, cost height, utilization underaction; And it has the function of stepless dimming, driving LED lamp group operate as normal that can be safe and reliable.
The present invention is achieved in that a kind of booster type led drive circuit, connects LED lamp group, and said booster type led drive circuit comprises:
Current-limiting resistance R1, current-limiting resistance R2, pull-up resistor R3, current-limiting resistance R4, sampling resistor R5, filter capacitor C1, storage capacitor C2, filter capacitor C3, energy storage inductor L1, diode D1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube, voltage stabilizing chip U1 and single-chip microcomputer U2;
First end of said energy storage inductor L1 is the input termination positive source of booster type led drive circuit; The anode of the second terminating diode D1 of said energy storage inductor L1; The negative electrode of said diode D1 connects the positive pole of said LED lamp group, and first termination power of said current-limiting resistance R1 is anodal, the input of the second termination voltage stabilizing chip U1 of said current-limiting resistance R1; The earth terminal ground connection of said voltage stabilizing chip U1; Said filter capacitor C1 is connected between the output and ground of voltage stabilizing chip U1, and the output of said voltage stabilizing chip U1 connects the power end of single-chip microcomputer U2, and said pull-up resistor R3 and dimmer switch S1 are serially connected between power supply and the ground; The dim signal sampling said pull-up resistor R3 of termination of said single-chip microcomputer U2 and the public connecting end of dimmer switch S1; Said sampling resistor R5 is connected between the negative pole and ground of LED lamp group, the said sampling resistor R5 of LED lamp group current sample termination of said single-chip microcomputer U2 and the public connecting end of LED lamp group, and the PWM output control terminal of said single-chip microcomputer U2 connects control end of switching tube through current-limiting resistance R4; The cold end ground connection of said switching tube; The grid of the high potential termination P type metal-oxide-semiconductor Q1 of said switching tube, the grounded drain of said P type metal-oxide-semiconductor Q1, the source electrode of said P type metal-oxide-semiconductor Q1 connects the public connecting end of said energy storage inductor L1 and diode D1; Said current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1; The positive pole of said storage capacitor C2 is connected with the positive pole of LED lamp group, the minus earth of said storage capacitor C2, and said filter capacitor C3 is connected between the positive pole and negative pole of LED lamp group.
Another object of the present invention is to provide a kind of light fixture, comprise LED lamp group, said light fixture also comprises the booster type led drive circuit, and said booster type led drive circuit comprises:
Current-limiting resistance R1, current-limiting resistance R2, pull-up resistor R3, current-limiting resistance R4, sampling resistor R5, filter capacitor C1, storage capacitor C2, filter capacitor C3, energy storage inductor L1, diode D1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube, voltage stabilizing chip U1 and single-chip microcomputer U2;
First end of said energy storage inductor L1 is the input termination positive source of booster type led drive circuit; The anode of the second terminating diode D1 of said energy storage inductor L1; The negative electrode of said diode D1 connects the positive pole of said LED lamp group, and first termination power of said current-limiting resistance R1 is anodal, the input of the second termination voltage stabilizing chip U1 of said current-limiting resistance R1; The earth terminal ground connection of said voltage stabilizing chip U1; Said filter capacitor C1 is connected between the output and ground of voltage stabilizing chip U1, and the output of said voltage stabilizing chip U1 connects the power end of single-chip microcomputer U2, and said pull-up resistor R3 and dimmer switch S1 are serially connected between power supply and the ground; The dim signal sampling said pull-up resistor R3 of termination of said single-chip microcomputer U2 and the public connecting end of dimmer switch S1; Said sampling resistor R5 is connected between the negative pole and ground of LED lamp group, the said sampling resistor R5 of LED lamp group current sample termination of said single-chip microcomputer U2 and the public connecting end of LED lamp group, and the PWM output control terminal of said single-chip microcomputer U2 connects control end of switching tube through current-limiting resistance R4; The cold end ground connection of said switching tube; The grid of the high potential termination P type metal-oxide-semiconductor Q1 of said switching tube, the grounded drain of said P type metal-oxide-semiconductor Q1, the source electrode of said P type metal-oxide-semiconductor Q1 connects the public connecting end of said energy storage inductor L1 and diode D1; Said current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1; The positive pole of said storage capacitor C2 is connected with the positive pole of LED lamp group, the minus earth of said storage capacitor C2, and said filter capacitor C3 is connected between the positive pole and negative pole of LED lamp group.
In the present invention; This booster type led drive circuit all adopts free-standing components and parts to constitute; Use single-chip microcomputer to control and realize boost function, and LED lamp group electric current is detected, controls, through revising the Single-chip Controlling program through pwm pulse; Just can regulate, also can regulate the brightness of LED lamp group through dimmer switch to maximum output current.The present invention has efficiently, advantage such as reliable, cheap, simple, light, overcome the integrated shortcoming of constant current.
Description of drawings
Fig. 1 is the structure chart of the booster type led drive circuit that provides of first embodiment of the invention;
Fig. 2 is the structure chart of the booster type led drive circuit that provides of second 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.
Fig. 1 shows the structure of the booster type led drive circuit that first 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.
The booster type led drive circuit connects LED lamp group, and the booster type led drive circuit comprises:
Current-limiting resistance R1, current-limiting resistance R2, pull-up resistor R3, current-limiting resistance R4, sampling resistor R5, filter capacitor C1, storage capacitor C2, filter capacitor C3, energy storage inductor L1, diode D1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube 100, voltage stabilizing chip U1 and single-chip microcomputer U2;
First end of energy storage inductor L1 is the input termination positive source of booster type led drive circuit, the anode of the second terminating diode D1 of energy storage inductor L1, and the negative electrode of diode D1 connects the positive pole of LED lamp group; First termination power of current-limiting resistance R1 is anodal, the input Vin of the second termination voltage stabilizing chip U1 of current-limiting resistance R1, the earth terminal gnd ground connection of voltage stabilizing chip U1; Filter capacitor C1 is connected between the output end vo ut and ground of voltage stabilizing chip U1; In order to guarantee the stable voltage of output end vo ut output of voltage stabilizing chip U1, the output end vo ut of voltage stabilizing chip U1 meets the power end VCC of single-chip microcomputer U2, and pull-up resistor R3 and dimmer switch S1 are serially connected between power supply VCC and the ground; The dim signal sampling end PB4 of single-chip microcomputer U2 connects the public connecting end that draws resistance R 3 and dimmer switch S1; Sampling resistor R5 is connected between the negative pole and ground of LED lamp group, and the LED lamp group current sample end PB0 of single-chip microcomputer U2 connects the public connecting end of sampling resistor R5 and LED lamp group, and the PWM output control terminal PB1 of single-chip microcomputer U2 connects the control end of switching tube 100 through current-limiting resistance R4; The cold end ground connection of switching tube 100; The grid of the high potential termination P type metal-oxide-semiconductor Q1 of switching tube 100, the grounded drain of P type metal-oxide-semiconductor Q1, the source electrode of P type metal-oxide-semiconductor Q1 connects the public connecting end of energy storage inductor L1 and diode D1; Current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1; The positive pole of storage capacitor C2 is connected with LED lamp group is anodal, and the minus earth of storage capacitor C2 guarantees the stable of LED lamp group voltage; Filter capacitor C3 is connected between LED lamp group positive pole and the negative pole, guarantees that LED lamp group does not receive external interference.
As one embodiment of the invention, switching tube 100 adopts triode Q2, and the base stage of triode Q2 is the control end of switching tube 100, and the current collection of triode Q2 is the hot end of switching tube 100 very, and the emission of triode Q2 is the cold end of switching tube 100 very.
Fig. 2 shows the structure of the booster type led drive circuit that second 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.
As one embodiment of the invention, switching tube 100 adopts N type metal-oxide-semiconductor Q3, and the grid of N type metal-oxide-semiconductor Q3 is the control end of switching tube 100, and the drain electrode of N type metal-oxide-semiconductor Q3 is the hot end of switching tube 100, and the source electrode of N type metal-oxide-semiconductor Q3 is the cold end of switching tube 100.
As one embodiment of the invention, voltage stabilizing chip U1 adopts the LM7805 chip.
As one embodiment of the invention, single-chip microcomputer U2 adopts the TINY13V chip.
The embodiment of the invention also provides a kind of light fixture, comprises LED lamp group, and light fixture also comprises above-mentioned booster type led drive circuit.
Adopting triode Q2 with switching tube 100 below is example, and the operation principle of booster type led drive circuit is described:
After energized; Voltage stabilizing chip U1 operate as normal and output end vo ut output+5V voltage; Single-chip microcomputer U2 power end VCC gets electric and starts working according to the program of establishing in it; The PWM output control terminal PB1 output pwm pulse of single-chip microcomputer U2 also drives triode Q2 break-make, and supply voltage is through energy storage inductor L1, P type metal-oxide-semiconductor Q1, diode D1, sampling resistor R5, LED lamp group formation work loop, and LED lamp group begins constant current work.In the time of the needs light modulation, can press dimmer switch S1; After the dim signal sampling end PB4 of single-chip microcomputer U2 samples dim signal; Single-chip microcomputer U2 adjusts the pwm pulse duty ratio of PWM output control terminal PB1 output, drives triode Q2 break-make, thereby reaches the stepless dimming effect.
Single-chip microcomputer U2 adjusts PWM output control terminal PB1 output duty of ratio, in one-period automatically also according to the pressure drop above the sampling resistor R5; When PWM output control terminal PB1 output low level; Triode Q2 turn-offs, and P type metal-oxide-semiconductor Q1 grid is a high level, so also turn-off; Current circuit forms the loop through energy storage inductor L1, diode D1, LED lamp group and sampling resistor R5 to power cathode, for LED lamp group provides electric current and storage capacitor C2 storage power; When PWM output control terminal PB1 output high level, triode Q2 conducting, P type metal-oxide-semiconductor Q1 grid is a low level; So also conducting, current circuit process energy storage inductor L1, P type metal-oxide-semiconductor Q1 are to power cathode formation work loop, energy storage inductor L1 storage power; When next cycle, discharge energy, play the effect that raises voltage, this moment, the electric current of LED lamp group then relied on storage capacitor C2 to keep; Storage capacitor C2, LED lamp group and sampling resistor R5 have then constituted the work loop; Up to the arrival of next cycle, work so repeatedly, reach the purpose of constant-current driving LED lamp group operate as normal.
The LED lamp group current sample end PB0 of single-chip microcomputer U2 forms a comparator with its inner reference voltage; Single-chip microcomputer U2 controls the duty ratio that PWM output control terminal PB1 adjusts the pwm pulse of exporting automatically according to the sampled voltage of LED lamp group current sample end PB0 and the comparative result of reference voltage, if sampled voltage, explains that output current is greater than set point greater than reference voltage; The duty ratio of pwm pulse just increases so; Reduce output current to set point, if sampled voltage, explains that output current is less than set point less than reference voltage; The duty ratio of pwm pulse just reduces so, increases output current to set point.
In addition, when the dim signal sampling end PB4 of single-chip microcomputer U2 collected dim signal, single-chip microcomputer U2 understood auto-idled LED lamp group current sample end PB0, and forced light modulation according to the program of establishing in it.
In embodiments of the present invention; This booster type led drive circuit all adopts free-standing components and parts to constitute; Use single-chip microcomputer to control and realize boost function, and LED lamp group electric current is detected, controls, through revising the Single-chip Controlling program through pwm pulse; Just can regulate, also can regulate the brightness of LED lamp group through dimmer switch to maximum output current.The present invention has efficiently, advantage such as reliable, cheap, simple, light, overcome the integrated many shortcomings of constant current.
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 (10)
1. a booster type led drive circuit connects LED lamp group, it is characterized in that, said booster type led drive circuit comprises:
Current-limiting resistance R1, current-limiting resistance R2, pull-up resistor R3, current-limiting resistance R4, sampling resistor R5, filter capacitor C1, storage capacitor C2, filter capacitor C3, energy storage inductor L1, diode D1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube, voltage stabilizing chip U1 and single-chip microcomputer U2;
First end of said energy storage inductor L1 is the input termination positive source of booster type led drive circuit; The anode of the second terminating diode D1 of said energy storage inductor L1; The negative electrode of said diode D1 connects the positive pole of said LED lamp group, and first termination power of said current-limiting resistance R1 is anodal, the input of the second termination voltage stabilizing chip U1 of said current-limiting resistance R1; The earth terminal ground connection of said voltage stabilizing chip U1; Said filter capacitor C1 is connected between the output and ground of voltage stabilizing chip U1, and the output of said voltage stabilizing chip U1 connects the power end of single-chip microcomputer U2, and said pull-up resistor R3 and dimmer switch S1 are serially connected between power supply and the ground; The dim signal sampling said pull-up resistor R3 of termination of said single-chip microcomputer U2 and the public connecting end of dimmer switch S1; Said sampling resistor R5 is connected between the negative pole and ground of LED lamp group, the said sampling resistor R5 of LED lamp group current sample termination of said single-chip microcomputer U2 and the public connecting end of LED lamp group, and the PWM output control terminal of said single-chip microcomputer U2 connects control end of switching tube through current-limiting resistance R4; The cold end ground connection of said switching tube; The grid of the high potential termination P type metal-oxide-semiconductor Q1 of said switching tube, the grounded drain of said P type metal-oxide-semiconductor Q1, the source electrode of said P type metal-oxide-semiconductor Q1 connects the public connecting end of said energy storage inductor L1 and diode D1; Said current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1; The positive pole of said storage capacitor C2 is connected with the positive pole of LED lamp group, the minus earth of said storage capacitor C2, and said filter capacitor C3 is connected between the positive pole and negative pole of LED lamp group.
2. booster type led drive circuit as claimed in claim 1; It is characterized in that; Said switching tube adopts triode Q2; The base stage of said triode Q2 is a control end of switching tube, and the current collection of said triode Q2 is the hot end of switching tube very, and the emission of said triode Q2 is the cold end of switching tube very.
3. booster type led drive circuit as claimed in claim 1; It is characterized in that; Said switching tube adopts N type metal-oxide-semiconductor Q3; The grid of said N type metal-oxide-semiconductor Q3 is a control end of switching tube, and the drain electrode of said N type metal-oxide-semiconductor Q3 is the hot end of switching tube, and the source electrode of said N type metal-oxide-semiconductor Q3 is the cold end of switching tube.
4. booster type led drive circuit as claimed in claim 1 is characterized in that, said voltage stabilizing chip U1 adopts the LM7805 chip.
5. booster type led drive circuit as claimed in claim 1 is characterized in that, said single-chip microcomputer U2 adopts the TINY13V chip.
6. a light fixture comprises LED lamp group, it is characterized in that said light fixture also comprises the booster type led drive circuit, and said booster type led drive circuit comprises:
Current-limiting resistance R1, current-limiting resistance R2, pull-up resistor R3, current-limiting resistance R4, sampling resistor R5, filter capacitor C1, storage capacitor C2, filter capacitor C3, energy storage inductor L1, diode D1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube, voltage stabilizing chip U1 and single-chip microcomputer U2;
First end of said energy storage inductor L1 is the input termination positive source of booster type led drive circuit; The anode of the second terminating diode D1 of said energy storage inductor L1; The negative electrode of said diode D1 connects the positive pole of said LED lamp group, and first termination power of said current-limiting resistance R1 is anodal, the input of the second termination voltage stabilizing chip U1 of said current-limiting resistance R1; The earth terminal ground connection of said voltage stabilizing chip U1; Said filter capacitor C1 is connected between the output and ground of voltage stabilizing chip U1, and the output of said voltage stabilizing chip U1 connects the power end of single-chip microcomputer U2, and said pull-up resistor R3 and dimmer switch S1 are serially connected between power supply and the ground; The dim signal sampling said pull-up resistor R3 of termination of said single-chip microcomputer U2 and the public connecting end of dimmer switch S1; Said sampling resistor R5 is connected between the negative pole and ground of LED lamp group, the said sampling resistor R5 of LED lamp group current sample termination of said single-chip microcomputer U2 and the public connecting end of LED lamp group, and the PWM output control terminal of said single-chip microcomputer U2 connects control end of switching tube through current-limiting resistance R4; The cold end ground connection of said switching tube; The grid of the high potential termination P type metal-oxide-semiconductor Q1 of said switching tube, the grounded drain of said P type metal-oxide-semiconductor Q1, the source electrode of said P type metal-oxide-semiconductor Q1 connects the public connecting end of said energy storage inductor L1 and diode D1; Said current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1; The positive pole of said storage capacitor C2 is connected with the positive pole of LED lamp group, the minus earth of said storage capacitor C2, and said filter capacitor C3 is connected between the positive pole and negative pole of LED lamp group.
7. light fixture as claimed in claim 6; It is characterized in that said switching tube adopts triode Q2, the base stage of said triode Q2 is a control end of switching tube; The current collection of said triode Q2 is the hot end of switching tube very, and the emission of said triode Q2 is the cold end of switching tube very.
8. light fixture as claimed in claim 6; It is characterized in that said switching tube adopts N type metal-oxide-semiconductor Q3, the grid of said N type metal-oxide-semiconductor Q3 is a control end of switching tube; The drain electrode of said N type metal-oxide-semiconductor Q3 is the hot end of switching tube, and the source electrode of said N type metal-oxide-semiconductor Q3 is the cold end of switching tube.
9. light fixture as claimed in claim 6 is characterized in that, said voltage stabilizing chip U1 adopts the LM7805 chip.
10. light fixture as claimed in claim 6 is characterized in that, said single-chip microcomputer U2 adopts the TINY13V chip.
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| CN2011101477300A CN102811530A (en) | 2011-06-02 | 2011-06-02 | Voltage-rising type LED driving circuit and lamp |
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| CN2011101477300A CN102811530A (en) | 2011-06-02 | 2011-06-02 | Voltage-rising type LED driving circuit and lamp |
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Application publication date: 20121205 |