CN101720148A - LED driving circuit and LED device - Google Patents

LED driving circuit and LED device Download PDF

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Publication number
CN101720148A
CN101720148A CN200910109008A CN200910109008A CN101720148A CN 101720148 A CN101720148 A CN 101720148A CN 200910109008 A CN200910109008 A CN 200910109008A CN 200910109008 A CN200910109008 A CN 200910109008A CN 101720148 A CN101720148 A CN 101720148A
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China
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output
led lamp
drive circuit
led
led drive
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CN200910109008A
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Chinese (zh)
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CN101720148B (en
Inventor
周明杰
孙占民
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海洋王照明科技股份有限公司
深圳市海洋王照明工程有限公司
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Priority to CN2009101090080A priority Critical patent/CN101720148B/en
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Abstract

The invention is applicable to the field of LEDs, and provides an LED driving circuit and an LED device. The LED driving circuit comprises a control module, a boosting module, a first switching tube, and an energy storage element and a one-way conductive element which are connected in series between the output end of an electric power supply and the anode of an LED lamp in turn. In the LED driving circuit provided by the invention, the boosting module is adopted to carry out feedback sampling on power supply voltage signals of the LED lamp; the acquired voltage signals are subjected to boosting treatment and constant voltage is output to drive the LED lamp to work, so that steady and constant working voltage is provided for the LED lamp to ensure high luminous efficiency of the LED lamp; in addition, an access is provided for the LED lamp through the conduction of the first switching tube, so that the LED lamp can work steadily and reliably.

Description

A kind of led drive circuit and LED matrix

Technical field

The invention belongs to the LED field, relate in particular to a kind of led drive circuit and LED matrix.

Background technology

Continuous development along with science and technology, the new product new technology is constantly reformed, LED is as new type light source, it has energy-conservation, environmental protection, characteristics of high efficiency, the LED technology is ripe and be applied to every field, various drive circuits have also appearred thereupon, generally adopting at present lithium battery all is to adopt constant current chip or PWM copped wave pattern to drive as the led drive circuit scheme of power supply, yet these two kinds of drive circuits all have a shortcoming: when lithium battery forces down in 3.3V (the lithium battery discharge range is 2.7V-4.2V), led drive circuit can not carry out constant current output, the efficient that causes the LED lamp, luminous intensity has all reduced a lot, so brought very big inconvenience for the use of LED lamp.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of led drive circuit, is intended to solve existing led drive circuit and can not exports when lithium battery forces down in 3.3V that the efficient that constant current causes the LED lamp is low, the problem of job insecurity.

The embodiment of the invention is achieved in that a kind of led drive circuit, comprising: control module, boost module, first switching tube and be connected to the output of power supply successively and the anode of LED lamp between energy-storage travelling wave tube and unidirectional breakover element; Described first control end of switching tube is connected to second output of described control module, an end ground connection of described first switching tube, and the other end of described first switching tube is connected to the negative electrode of LED lamp; The power end of described boost module is connected to the output of power supply, the Enable Pin of described boost module is connected to first output of described control module, and the power take-off of described boost module is connected to the end that is connected in series of described energy-storage travelling wave tube and described unidirectional breakover element; The feedback end of described boost module is connected to the anode of described LED lamp; The power end of described control module is connected to the output of described power supply, the control end of described control module connects switch, when switch closure, described boost module is according to the high level signal work of first output of described control module output, the voltage signal of its feedback end collection boosted handle and the output constant voltage drives the work of described LED lamp; Described first switching tube provides path according to the high level signal conducting of second output of described control module output and for described LED lamp.

Wherein, described control module further comprises: single-chip microcomputer, oscillation resistance, pull-up resistor, reset capacitance; The power end of described single-chip microcomputer is connected to the output of described power supply, the control end of described single-chip microcomputer connects described switch, first output of described single-chip microcomputer is connected to the Enable Pin of described boost module, and second output of described single-chip microcomputer is connected to described first control end of switching tube; Described oscillation resistance is connected between the vibration end and ground of described single-chip microcomputer; Described pull-up resistor and described reset capacitance are connected between the power end and ground of described single-chip microcomputer successively, and the end that is connected in series of described pull-up resistor and described reset capacitance is connected to the reset terminal of described single-chip microcomputer.

Wherein, described power supply is the lithium battery of 3.7V.

Wherein, described boost module further comprises: boosting unit and capacitor C 7, resistance R 6, capacitor C 1; The Enable Pin of described boosting unit is connected to first output of described boost module, the frequency selecting side ground connection of described boosting unit, the power end of described boosting unit is connected to the output of described power supply, the power take-off of described boosting unit is connected to the end that is connected in series of described energy-storage travelling wave tube and described unidirectional breakover element, the feedback end of described boosting unit is connected to the anode of described LED lamp, and the compensation end of described boosting unit is successively by described resistance R 6, capacitor C 1 ground connection; The earth terminal of described boosting unit is connected with ground, and the soft start end of described boosting unit is by described capacitor C 7 ground connection.

Wherein, described energy-storage travelling wave tube is an inductance, and described unidirectional breakover element is a diode.

Wherein, described led drive circuit further comprises: be connected to first output of described control module and the pull down resistor between the ground.

Wherein, described led drive circuit further comprises: the anode and first divider resistance between the ground and second divider resistance that are connected to described LED lamp successively; Described first divider resistance is connected with the feedback end of described boost module with the end that is connected in series of described second divider resistance.

Wherein, described led drive circuit further comprises: second switch pipe, first current-limiting resistance, second current-limiting resistance, the 3rd divider resistance and the 4th divider resistance; One end of described the 3rd divider resistance is connected to the negative electrode of described LED lamp, one end of described the 3rd divider resistance also is connected to the other end of described first switching tube by described first current-limiting resistance, the other end of described the 3rd divider resistance is by described the 4th divider resistance ground connection; One end ground connection of described second switch pipe, the other end of described second switch pipe is connected to described first control end of switching tube, and the control end of described second switch pipe is connected to the end that is connected in series of described the 3rd divider resistance and described the 4th divider resistance by described second current-limiting resistance.

Wherein, described first switching tube is a triode, and the base stage of described triode is connected to second output of described control module, the grounded emitter of described triode, and the collector electrode of described triode is connected to the negative electrode of described LED lamp.

Another purpose of the embodiment of the invention is to provide a kind of LED matrix, and it comprises LED lamp and the led drive circuit that is used to drive the work of described LED lamp, and described led drive circuit is above-mentioned led drive circuit.

The led drive circuit that the embodiment of the invention provides adopts boost module that the supply power voltage signal of LED lamp is carried out feedback sample, the voltage signal of gathering boosted handle and the work of output constant voltage driving LED lamp, like this luminous efficiency height that can provide stable, constant operating voltage to make the LED lamp for the LED lamp; And the conducting by first switching tube is for the LED lamp provides path, makes the work that the LED lamp is reliable and stable.

Description of drawings

Fig. 1 is the circuit diagram of the led drive circuit that provides of the embodiment of the invention.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.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 adopts boost module that the supply power voltage signal of LED lamp is carried out feedback sample, the voltage signal of gathering boosted handle and the work of output constant voltage driving LED lamp, can provide stable, constant operating voltage for the LED lamp like this; And the conducting by first switching tube is for the LED lamp provides path, makes the work that the LED lamp is reliable and stable.

The led drive circuit that the embodiment of the invention provides is mainly used in and is used for the work of driving LED lamp in the LED matrix; Fig. 1 shows the circuit diagram of the led drive circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.

Led drive circuit comprises: control module 2, boost module 3, first switching tube 4, energy-storage travelling wave tube 5 and unidirectional breakover element 6; Wherein, energy-storage travelling wave tube 5 and unidirectional breakover element 6 are connected between the anode of the output of power supply 1 and LED lamp 7 successively; The control end of first switching tube 4 is connected to second output of control module 2, an end ground connection of first switching tube 4, and the other end of first switching tube 4 is connected to the negative electrode of LED lamp 7; The power end of boost module 3 is connected to the output of power supply 1, and the Enable Pin of boost module 3 is connected to first output of control module 2, and the power take-off of boost module 3 is connected to the end that is connected in series of energy-storage travelling wave tube 5 and unidirectional breakover element 6; The feedback end of boost module 3 is connected to the anode of LED lamp 7; The power end of control module 2 is connected to the output of power supply 1, the control end of control module 2 connects switch S 1, when switch S 1 closure, boost module 3 is according to the high level signal work of first output of control module 2 output, the voltage signal of its feedback end collection boosted handle and 7 work of output constant voltage driving LED lamp; First switching tube 4 provides path according to the high level signal conducting of second output of control module 2 output and for LED lamp 7.

As one embodiment of the present of invention, power supply 1 can be the lithium battery of 3.7V; Power supply 1 provides the work enable voltage by control module 2 for boost module 3 and first switching tube 4; Boost module 3 is inner integrated metal-oxide-semiconductor carries out the output voltage sampling by its feedback end, carries out voltage through energy-storage travelling wave tube 5 and unidirectional breakover element 6 and raises and constant output, for LED lamp 7 provides stable operating voltage; Control module 2 makes the 4 conducting work of first switching tube by giving first switching tube, 4 output high level signals, thereby for LED lamp 7 provides a path, realizes the 7 reliable and stable work of LED lamp.

In embodiments of the present invention, control module 2 further comprises: single-chip microcomputer U1, oscillation resistance R2, pull-up resistor R3 and reset capacitance C3; Wherein, the power end VDD of single-chip microcomputer U1 is connected to the output of power supply 1, the control end PA2 of single-chip microcomputer U1 connects switch S 1, and the first output PA0 of single-chip microcomputer U1 is connected to the Enable Pin SHDN of boost module 3, and the second output PD0 of single-chip microcomputer U1 is connected to the control end of first switching tube 4; Oscillation resistance R2 is connected between the vibration end OSC1 and ground VSS of single-chip microcomputer U1; Pull-up resistor R3 and reset capacitance C3 are connected between the power end VDD and ground VSS of single-chip microcomputer U1 successively, and the end that is connected in series of pull-up resistor R3 and reset capacitance C3 is connected to the reset terminal RES of single-chip microcomputer U1; Other ports PA3, PA1, PB3, PB2, PB1, PB0, OSC2, PA7, PA6 and the PA5 of single-chip microcomputer U1 is all unsettled not to be connect.

In embodiments of the present invention, boost module 3 further comprises: boosting unit U3 and capacitor C 7, resistance R 6, capacitor C 1; Wherein, the Enable Pin SHDN of boosting unit U3 is connected to the first output PA0 of boost module 2, the frequency selecting side FSEL ground connection of boosting unit U3, the power end VIN of boosting unit U3 is connected to the output of power supply 1, the power take-off SW of boosting unit U3 is connected to the end that is connected in series of energy-storage travelling wave tube 5 and unidirectional breakover element 6, the feedback end FB of boosting unit U3 is connected to the anode of LED lamp 7, and the compensation end COMP of boosting unit U3 is successively by resistance R 6, capacitor C 1 ground connection; The earth terminal GND of boosting unit U3 is connected with ground, and the soft start end SS of boosting unit U3 is by capacitor C 7 ground connection.

As one embodiment of the present of invention, energy-storage travelling wave tube 5 can be inductance L 1, and unidirectional breakover element 6 can be diode D2, and wherein diode D2 anode is connected to the output of power supply 1 by inductance L 1, and the negative electrode of diode D2 is connected to the anode of LED lamp 7.

In embodiments of the present invention, led drive circuit further comprises: be connected to first output of control module 2 and the pull down resistor R5 between the ground.

In embodiments of the present invention, led drive circuit also comprises: the first divider resistance R7 and the second divider resistance R8; Wherein, the first divider resistance R7 and the second divider resistance R8 are connected between the anode and ground of LED lamp 7 successively; And the first divider resistance R7 is connected with the feedback end FB of boost module 3 with the end that is connected in series of the second divider resistance R8.

In embodiments of the present invention, led drive circuit further comprises: second switch pipe 8, the first current-limiting resistance R9, the second current-limiting resistance R12, the 3rd divider resistance R10 and the 4th divider resistance R11; Wherein, the end of the 3rd divider resistance R10 is connected to the negative electrode of LED lamp 7, the end of the 3rd divider resistance R10 also is connected to the other end of first switching tube 4 by the first current resistor R9, the other end of the 3rd divider resistance R10 is by the 4th divider resistance R11 ground connection; One end ground connection of second switch pipe 8, the other end of second switch pipe 8 is connected to the control end of first switching tube 4, and the control end of second switch pipe 8 is connected to the end that is connected in series of the 3rd divider resistance R10 and the 4th divider resistance R11 by the second current-limiting resistance R12.

In embodiments of the present invention, first switching tube 4 can be the switching tube of metal-oxide-semiconductor, triode or other any on-off action.In embodiments of the present invention, first switching tube 4 is triode Q1, and wherein, the base stage of triode O1 is connected to second output of control module 2, the grounded emitter of triode Q1, and the collector electrode of triode Q1 is connected to the negative electrode of LED lamp 7.

As one embodiment of the present of invention, second switch pipe 8 can be triode Q2, and wherein, the base stage of triode Q2 is connected to the end that is connected in series of the 3rd divider resistance R10 and the 4th divider resistance R11 by the second current-limiting resistance R12; The grounded emitter of triode Q2, the collector electrode of triode Q2 are connected to triode Q1 base stage.

In embodiments of the present invention, led drive circuit also comprises: capacitor C 4, capacitor C 5, capacitor C 6 and capacitor C 8; Wherein, an end ground connection of capacitor C 4, the other end is connected to the output of power supply 1; One end ground connection of capacitor C 5, the other end are connected to the negative electrode of diode D2 and the anode of LED lamp 7 respectively; Capacitor C 6 is connected in parallel with capacitor C 5; Capacitor C 8 and the 4th divider resistance R11 are connected in parallel.

For the led drive circuit that illustrates that further the embodiment of the invention provides, existing in conjunction with Fig. 1 in detail the operation principle of led drive circuit to be described in detail as follows: meet oscillation resistance R2 between the OSC1 pin of single-chip microcomputer U1 and the VSS pin, U1 provides clock oscillation for single-chip microcomputer; The VDD pin of single-chip microcomputer U1 is connected with the positive pole of power supply 1 as supply pin, connects between the VDD of single-chip microcomputer U1 pin and RES pin and draws resistance R 3; Meet reset capacitance C3 between the VSS pin of single-chip microcomputer U1 and the RES pin; The PA2 pin of single-chip microcomputer U1 connects switch S 1, when the button of switch S 1 is pressed, PA0 pin and the PD0 pin of single-chip microcomputer U1 are all exported high level signal, and wherein, the PA0 pin of single-chip microcomputer U1 provides enable voltage for the SHDN pin of boosting unit U3, and by pull down resistor R5 ground connection, boosting unit U3 is started working, and the PD0 pin of single-chip microcomputer U1 links to each other with the base stage of triode Q1 by resistance R 4, for the base stage of triode Q1 provides high level signal, make the reliable conducting of triode Q1, for LED lamp 7 provides path.

The COMP pin of boosting unit U3 is the compensation pin, successively by resistance R 6 and capacitor C 1 ground connection; The FB pin of boosting unit U3 is the feedback pin, is connected with the end that is connected in series of the first divider resistance R7 and the second divider resistance R8, and the reference voltage of feedback pin is 1.24V; The SHDN pin of boosting unit U3 is that work enables pin, and high level is effective, and when high level signal arrived the SHDN pin of boosting unit U3, boosting unit U3 started working; The GND pin of boosting unit U3 is the direct ground connection of lower margin; The VIN pin of boosting unit U3 is that supply pin is connected with the positive pole of power supply 1, connects inductance L 1 between the VIN of boosting unit U3 pin and SW pin; The SW pin of boosting unit U3 is connected to the anode of diode D2 for the power output pin, and the FSEL pin of boosting unit U3 is that frequency selects the direct ground connection of pin to represent that operating frequency is 620KHz; The SS pin of boosting unit U3 is that the soft start pin is connected with capacitor C 7; When high level signal arrives the SHDN pin of boosting unit U3, boosting unit U3 starts working, give the voltage signal of the FB pin feedback of boosting unit U3 according to the first divider resistance R7 and the second divider resistance R8, the pwm pulse that the inside of boosting unit U3 produces drives the metal-oxide-semiconductor that is integrated in boosting unit U3 inside, finish the work of boosting together by outside boost inductance L1 and diode D2, export 7 work of stable operating voltage driving LED lamp; Meanwhile the base stage of triode Q1 receives high level signal, the collector and emitter conducting, and the first current-limiting resistance R9 provides active channel for LED lamp 7 by current-limiting resistance.

When the situation of short circuit or overcurrent appears in LED lamp 7; the junction voltage of the first current-limiting resistance R9 and the 3rd divider resistance R10 is drawn high; the cathode potential that is LED lamp 7 is drawn high; after this current potential is distributed by the 3rd divider resistance R10 and the 4th divider resistance R11; current potential in the second current-limiting resistance R12 and the 4th divider resistance R11 junction is also drawn high; the base stage of the second current-limiting resistance R12 and triode Q2 is connected; the high level signal that produce this moment arrives the base stage of triode Q2 by the second current-limiting resistance R12; the collector and emitter conducting of triode Q2; the high level signal of triode Q1 base stage is connected with ground by the collector and emitter of triode Q2; the base stage of triode Q1 is clamped at low level; triode Q1 closes; LED lamp work loop is cut off, and quits work, and has short circuit and overcurrent protection.

The led drive circuit that the embodiment of the invention provides adopts boost module that the supply power voltage signal of LED lamp is carried out feedback sample, the voltage signal of gathering boosted handle and the work of output constant voltage driving LED lamp, like this luminous efficiency height that can provide stable, constant operating voltage to make the LED lamp for the LED lamp; And the conducting by first switching tube is for the LED lamp provides path, makes the work that the LED lamp can be reliable and stable.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a led drive circuit is characterized in that, described led drive circuit comprises:
Control module, boost module, first switching tube and be connected to the output of power supply successively and the anode of LED lamp between energy-storage travelling wave tube and unidirectional breakover element;
Described first control end of switching tube is connected to second output of described control module, an end ground connection of described first switching tube, and the other end of described first switching tube is connected to the negative electrode of LED lamp;
The power end of described boost module is connected to the output of power supply, the Enable Pin of described boost module is connected to first output of described control module, the power take-off of described boost module is connected to the end that is connected in series of described energy-storage travelling wave tube and described unidirectional breakover element, and the feedback end of described boost module is connected to the anode of described LED lamp;
The power end of described control module is connected to the output of described power supply, the control end of described control module connects switch, when switch closure, described boost module is according to the high level signal work of first output of described control module output, the voltage signal of its feedback end collection boosted handle and the output constant voltage drives the work of described LED lamp; Described first switching tube provides path according to the high level signal conducting of second output of described control module output and for described LED lamp.
2. led drive circuit as claimed in claim 1 is characterized in that, described control module further comprises:
Single-chip microcomputer, oscillation resistance, pull-up resistor, reset capacitance;
The power end of described single-chip microcomputer is connected to the output of described power supply, the control end of described single-chip microcomputer connects described switch, first output of described single-chip microcomputer is connected to the Enable Pin of described boost module, and second output of described single-chip microcomputer is connected to described first control end of switching tube;
Described oscillation resistance is connected between the vibration end and ground of described single-chip microcomputer;
Described pull-up resistor and described reset capacitance are connected between the power end and ground of described single-chip microcomputer successively, and the end that is connected in series of described pull-up resistor and described reset capacitance is connected to the reset terminal of described single-chip microcomputer.
3. led drive circuit as claimed in claim 1 is characterized in that, described power supply is the lithium battery of 3.7V.
4. led drive circuit as claimed in claim 1 is characterized in that, described boost module further comprises:
Boosting unit, capacitor C 7, resistance R 6 and capacitor C 1;
The Enable Pin of described boosting unit is connected to first output of described boost module, the frequency selecting side ground connection of described boosting unit, the power end of described boosting unit is connected to the output of described power supply, the power take-off of described boosting unit is connected to the end that is connected in series of described energy-storage travelling wave tube and described unidirectional breakover element, the feedback end of described boosting unit is connected to the anode of described LED lamp, and the compensation end of described boosting unit is successively by described resistance R 6, capacitor C 1 ground connection; The earth terminal of described boosting unit is connected with ground, and the soft start end of described boosting unit is by described capacitor C 7 ground connection.
5. led drive circuit as claimed in claim 1 is characterized in that, described energy-storage travelling wave tube is an inductance, and described unidirectional breakover element is a diode.
6. led drive circuit as claimed in claim 1 is characterized in that, described led drive circuit further comprises: be connected to first output of described control module and the pull down resistor between the ground.
7. led drive circuit as claimed in claim 1 is characterized in that, described led drive circuit further comprises:
Be connected to anode and first divider resistance between the ground and second divider resistance of described LED lamp successively;
Described first divider resistance is connected with the feedback end of described boost module with the end that is connected in series of described second divider resistance.
8. led drive circuit as claimed in claim 1 is characterized in that, described led drive circuit further comprises:
Second switch pipe, first current-limiting resistance, second current-limiting resistance, the 3rd divider resistance and the 4th divider resistance;
One end of described the 3rd divider resistance is connected to the negative electrode of described LED lamp, one end of described the 3rd divider resistance also is connected to the other end of described first switching tube by described first current-limiting resistance, the other end of described the 3rd divider resistance is by described the 4th divider resistance ground connection;
One end ground connection of described second switch pipe, the other end of described second switch pipe is connected to described first control end of switching tube, and the control end of described second switch pipe is connected to the end that is connected in series of described the 3rd divider resistance and described the 4th divider resistance by described second current-limiting resistance.
9. led drive circuit as claimed in claim 1, it is characterized in that described first switching tube is a triode, the base stage of described triode is connected to second output of described control module, the grounded emitter of described triode, the collector electrode of described triode is connected to the negative electrode of described LED lamp.
10. LED matrix, it comprises LED lamp and the led drive circuit that is used to drive the work of described LED lamp, it is characterized in that, described led drive circuit is each described led drive circuit of claim 1-9.
CN2009101090080A 2009-07-21 2009-07-21 LED driving circuit and LED device CN101720148B (en)

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