CN102811531A - Step-down LED driving circuit and lamp - Google Patents
Step-down LED driving circuit and lamp Download PDFInfo
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- CN102811531A CN102811531A CN2011101477847A CN201110147784A CN102811531A CN 102811531 A CN102811531 A CN 102811531A CN 2011101477847 A CN2011101477847 A CN 2011101477847A CN 201110147784 A CN201110147784 A CN 201110147784A CN 102811531 A CN102811531 A CN 102811531A
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Abstract
The invention relates to a step-down LED driving circuit and a lamp which are applicable to the field of LED. In an embodiment, the step-down LED driving circuit consists of independent elements, and a single-chip microcomputer is used for realizing a step-down function under PWM (pulse-width modulation) pulse control, and is used for detecting and controlling current of an LED lamp group. The maximum output current can be regulated by modifying a control program of the single-chip microcomputer, and brightness of the LED lamp group can be regulated by a dimming switch. The step-down LED driving circuit has the advantages of high efficiency, reliability, low price, simplicity, convenience and the like, and overcomes many defects of content-current integration.
Description
Technical field
The invention belongs to the LED field, relate in particular to a kind of voltage-dropping 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 the time far above LED lamp group rated voltage; LED lamp group just can not be operated in constant current state so, so just need be reduced to LED lamp group rated voltage to voltage, carries out constant-current driving again.Generally adopt the voltage-dropping 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 voltage-dropping type led drive circuit; Be intended to solve the problem that present voltage-dropping 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 voltage-dropping type led drive circuit, connects LED lamp group, and said voltage-dropping 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, sustained diode 1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube, voltage stabilizing chip U1 and single-chip microcomputer U2;
The source electrode of said P type metal-oxide-semiconductor Q1 is the input termination positive source of voltage-dropping type led drive circuit; The drain electrode of said P type metal-oxide-semiconductor Q1 connects first end of energy storage inductor L1; The positive pole of the said LED lamp of second termination group of said energy storage inductor L1, 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, said current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1, and the negative electrode of said sustained diode 1 connects first end of energy storage inductor L1; The plus earth of said sustained diode 1; 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 voltage-dropping type led drive circuit, and said voltage-dropping 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, sustained diode 1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube, voltage stabilizing chip U1 and single-chip microcomputer U2;
The source electrode of said P type metal-oxide-semiconductor Q1 is the input termination positive source of voltage-dropping type led drive circuit; The drain electrode of said P type metal-oxide-semiconductor Q1 connects first end of energy storage inductor L1; The positive pole of the said LED lamp of second termination group of said energy storage inductor L1, 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, said current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1, and the negative electrode of said sustained diode 1 connects first end of energy storage inductor L1; The plus earth of said sustained diode 1; 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 voltage-dropping type led drive circuit all adopts free-standing components and parts to constitute; Use single-chip microcomputer to control and realize buck functionality, 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 voltage-dropping type led drive circuit that provides of first embodiment of the invention;
Fig. 2 is the structure chart of the voltage-dropping 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 voltage-dropping 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 voltage-dropping type led drive circuit connects LED lamp group, and the voltage-dropping 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, sustained diode 1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube 100, voltage stabilizing chip U1 and single-chip microcomputer U2;
The source electrode of P type metal-oxide-semiconductor Q1 is the input termination positive source of voltage-dropping type led drive circuit, and the drain electrode of P type metal-oxide-semiconductor Q1 connects first end of energy storage inductor L1, the positive pole of the second termination LED lamp group of energy storage inductor L1; 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, current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1, and the negative electrode of sustained diode 1 connects first end of energy storage inductor L1; The plus earth of sustained diode 1; The positive pole of storage capacitor C2 is connected with the positive pole of LED lamp group, and the minus earth of storage capacitor C2 guarantees the stable of LED lamp group voltage; Filter capacitor C3 is connected between the positive pole and negative pole of LED lamp group, 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 voltage-dropping 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 voltage-dropping type led drive circuit.
Adopting triode Q2 with switching tube 100 below is example, and the operation principle of voltage-dropping 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 P type metal-oxide-semiconductor Q1, energy storage inductor L1, sustained diode 1, 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 high level; Triode Q2 conducting, P type metal-oxide-semiconductor Q1 grid is a low level, so also conducting; Current circuit forms the loop through P type metal-oxide-semiconductor Q1, energy storage inductor L1, LED lamp group and sampling resistor R5 to power cathode, for LED lamp group provides electric current and energy storage inductor L1 and storage capacitor C2 storage power; 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; To power cathode formation work loop, this moment, the electric current of LED lamp group leaned on energy storage inductor L1 and storage capacitor C2 to keep to current circuit, up to the arrival of next cycle through energy storage inductor L1, sustained diode 1, LED lamp group and sampling resistor R5; Work so repeatedly, can reduce too high voltage and 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, and single-chip microcomputer U2 is according to the sampled voltage of LED lamp group current sample end PB0 and the comparative result of reference voltage, and control PWM output control terminal PB1 adjusts the duty ratio of the pwm pulse of exporting automatically; If sampled voltage is greater than reference voltage; Output current is described greater than set point, the duty ratio of pwm pulse just reduces so, reduces output current to set point; If sampled voltage is less than reference voltage; Output current is described less than set point, the duty ratio of pwm pulse just increases 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 setting program in it.
In embodiments of the present invention; This voltage-dropping type led drive circuit all adopts free-standing components and parts to constitute; Use single-chip microcomputer to control and realize buck functionality, 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 voltage-dropping type led drive circuit connects LED lamp group, it is characterized in that, said voltage-dropping 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, sustained diode 1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube, voltage stabilizing chip U1 and single-chip microcomputer U2;
The source electrode of said P type metal-oxide-semiconductor Q1 is the input termination positive source of voltage-dropping type led drive circuit; The drain electrode of said P type metal-oxide-semiconductor Q1 connects first end of energy storage inductor L1; The positive pole of the said LED lamp of second termination group of said energy storage inductor L1, 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, said current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1, and the negative electrode of said sustained diode 1 connects first end of energy storage inductor L1; The plus earth of said sustained diode 1; 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. voltage-dropping 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. voltage-dropping 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. voltage-dropping type led drive circuit as claimed in claim 1 is characterized in that, said voltage stabilizing chip U1 adopts the LM7805 chip.
5. voltage-dropping 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 voltage-dropping type led drive circuit, and said voltage-dropping 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, sustained diode 1, dimmer switch S1, P type metal-oxide-semiconductor Q1, switching tube, voltage stabilizing chip U1 and single-chip microcomputer U2;
The source electrode of said P type metal-oxide-semiconductor Q1 is the input termination positive source of voltage-dropping type led drive circuit; The drain electrode of said P type metal-oxide-semiconductor Q1 connects first end of energy storage inductor L1; The positive pole of the said LED lamp of second termination group of said energy storage inductor L1, 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, said current-limiting resistance R2 is connected between the grid of positive source and P type metal-oxide-semiconductor Q1, and the negative electrode of said sustained diode 1 connects first end of energy storage inductor L1; The plus earth of said sustained diode 1; 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101477847A CN102811531A (en) | 2011-06-02 | 2011-06-02 | Step-down LED driving circuit and lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101477847A CN102811531A (en) | 2011-06-02 | 2011-06-02 | Step-down LED driving circuit and lamp |
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| CN102811531A true CN102811531A (en) | 2012-12-05 |
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| CN2011101477847A Pending CN102811531A (en) | 2011-06-02 | 2011-06-02 | Step-down LED driving circuit and lamp |
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Cited By (8)
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| CN104427708A (en) * | 2013-09-09 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Lamp control circuit and lamp |
| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
| CN106455184A (en) * | 2016-04-27 | 2017-02-22 | 熊运轩 | Fire-fighting intelligent emergency light fixture for meeting multiple bus communication modes without using power supply chip |
| CN109194319A (en) * | 2018-08-13 | 2019-01-11 | 北方电子研究院安徽有限公司 | PMOS tube driving circuit |
| CN110361918A (en) * | 2019-07-09 | 2019-10-22 | 深圳市火乐科技发展有限公司 | A kind of automatic light control system and the projector with it |
| CN110557859A (en) * | 2018-06-04 | 2019-12-10 | 光宝电子(广州)有限公司 | indicator light device and control method thereof |
| WO2024017066A1 (en) * | 2022-07-19 | 2024-01-25 | 佛山市威得士智能照明科技有限公司 | Led modular intelligent driving circuit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
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| CN106455184A (en) * | 2016-04-27 | 2017-02-22 | 熊运轩 | Fire-fighting intelligent emergency light fixture for meeting multiple bus communication modes without using power supply chip |
| CN110557859A (en) * | 2018-06-04 | 2019-12-10 | 光宝电子(广州)有限公司 | indicator light device and control method thereof |
| CN109194319A (en) * | 2018-08-13 | 2019-01-11 | 北方电子研究院安徽有限公司 | PMOS tube driving circuit |
| CN109194319B (en) * | 2018-08-13 | 2022-07-05 | 北方电子研究院安徽有限公司 | PMOS tube driving circuit |
| CN110361918A (en) * | 2019-07-09 | 2019-10-22 | 深圳市火乐科技发展有限公司 | A kind of automatic light control system and the projector with it |
| CN110361918B (en) * | 2019-07-09 | 2024-05-28 | 深圳市火乐科技发展有限公司 | Automatic dimming system and projector with same |
| WO2024017066A1 (en) * | 2022-07-19 | 2024-01-25 | 佛山市威得士智能照明科技有限公司 | Led modular intelligent driving circuit |
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Application publication date: 20121205 |