CN203934047U - A kind of LED drive circuit - Google Patents

A kind of LED drive circuit Download PDF

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Publication number
CN203934047U
CN203934047U CN201420235889.7U CN201420235889U CN203934047U CN 203934047 U CN203934047 U CN 203934047U CN 201420235889 U CN201420235889 U CN 201420235889U CN 203934047 U CN203934047 U CN 203934047U
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CN
China
Prior art keywords
constant
led
control
switching tube
driven module
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Expired - Fee Related
Application number
CN201420235889.7U
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Chinese (zh)
Inventor
朱士海
盛海忠
袁宗乾
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Zhejiang kaiyao Lighting Co Ltd
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Zhejiang Kai Yao Intelligent Lighting Science And Technology Ltd
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Priority to CN201420235889.7U priority Critical patent/CN203934047U/en
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Publication of CN203934047U publication Critical patent/CN203934047U/en
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Abstract

The utility model discloses a kind of LED drive circuit.It comprises control chip, constant-current driven module, the first switching tube, second switch pipe and the 3rd switching tube, a described LED particle, the first switching tube and constant-current driven module are connected into a loop, described the 2nd LED particle, second switch pipe and constant-current driven module are connected into a loop, described the 3rd LED particle, the 3rd switching tube and constant-current driven module are connected into a loop, and described control chip is electrically connected with the control end of constant-current driven module, control end, the control end of second switch pipe and the control end of the 3rd switching tube of the first switching tube respectively.Brightness, colour temperature and color requirement that the utility model can be set according to user, control different LED particle operating state, reaches the effect of setting, outputting current steadily, and no current overshoot, has reduced extra power consumption.

Description

A kind of LED drive circuit
Technical field
The utility model relates to LED Driving technique field, relates in particular to a kind of LED drive circuit.
Background technology
Along with LED is in the application of lighting field, people have proposed new requirement to the comfort level of lighting of home, not only will control the switch of light, also require brightness, colour temperature, the color of light adjustable, and will adopt more intelligent and control mode easily.At present, on market, mostly adopt a driver module, output constant voltage, load is the parallel connection of LED multi-path particle, in every paths of LEDs particle branch road, series resistance and switch, resistance is used for current limliting, prevents that the inconsistent LED of the causing electric current of LED particle pressure drop is excessive, the duty ratio of by-pass cock, thereby regulate the LED electric current light mixng proportion of each branch road, obtain the illuminating effect of different color and brightness.But adopt resistance current-limiting mode can not control well LED current constant, and increased power consumption.
China Patent Publication No. CN102056373, open day on May 11st, 2011, the name of invention is called the lighting remote controlled system of LED of a kind of brightness-adjustable and colour temperature, this application case discloses the lighting remote controlled system of LED of a kind of brightness-adjustable and colour temperature, it adopts single-chip microcomputer output pwm pulse, a pwm control signal for each LED driver module, regulates electric current output, obtains different brightness and color temperature value after disparate modules colour mixture.Its weak point is, adopts many group driver modules to drive respectively different LED particle, such control system more complicated, and cost is higher.
Summary of the invention
The purpose of this utility model is that the LED drive circuit that overcomes existing adjustable LED brightness, colour temperature and color adopts resistance current-limiting mode control LED current constant, control effect is bad, and increase the technical problem of power consumption, a kind of LED drive circuit is provided, and brightness, colour temperature and color requirement that it can be set according to user, control different LED particle operating state, reach the effect of setting, outputting current steadily, no current overshoot, has reduced extra power consumption.
In order to address the above problem, the utility model is achieved by the following technical solutions:
A kind of LED drive circuit of the present utility model, for driving LED lamp, described LED lamp comprises the LED particle glowing, the 2nd LED particle of green light and the 3rd LED particle of blue light-emitting, described LED drive circuit comprises control chip, constant-current driven module, the first switching tube, second switch pipe and the 3rd switching tube, a described LED particle, the first switching tube and constant-current driven module are connected into a loop, described the 2nd LED particle, second switch pipe and constant-current driven module are connected into a loop, described the 3rd LED particle, the 3rd switching tube and constant-current driven module are connected into a loop, described control chip respectively with the control end of constant-current driven module, the control end of the first switching tube, the control end electrical connection of the control end of second switch pipe and the 3rd switching tube.
In the technical program, control chip can be controlled the size of constant-current driven module output current, thereby controls the brightness of LED lamp.The 3rd LED particle conducting successively of the LED particle that control chip glows according to certain frequency control, the 2nd LED particle of green light and blue light-emitting, the same time only has at most a LED particle in conducting state, like this, electric current when each LED particle work is exactly the output current of constant-current driven module, has ensured the stable of output current.Control chip regulates the ON time t1 of each LED particle, t2 and t3, and after mixed light is processed, color, colour temperature and brightness that can free adjustment LED.
As preferably, described constant-current driven module comprises that DC/DC drives chip, electronic switch S, diode D, inductance L, capacitor C 1, capacitor C 2 and sampling resistor R, the input of electronic switch S is electrically connected with the first end of capacitor C 1 and the positive source of LED lamp, the second end ground connection of capacitor C 1, the output of electronic switch S is connected with the cathodic electricity of the first end of inductance L and diode D, the plus earth of diode D, the control end of electronic switch S drives the control signal output of chip to be electrically connected with DC/DC, the second end of inductance L drives the voltage sample end of chip to be electrically connected with the first end of capacitor C 2 and DC/DC, the second end ground connection of capacitor C 2, DC/DC drives the current sample end of chip to be electrically connected with the first end of sampling resistor R, the second end ground connection of sampling resistor R, DC/DC drives the control signal input of chip to be electrically connected with control chip, the first end of capacitor C 2 is as the output cathode of constant-current driven module, the first end of sampling resistor R is as the output negative pole of constant-current driven module.Simple in structure, low in energy consumption, control accurately.
As preferably, described control chip is single-chip microcomputer.
Helpfulness effect of the present utility model is: brightness, colour temperature and the color requirement that can set according to user, control different LED particle operating state, and reach the effect of setting, outputting current steadily, no current overshoot, has reduced extra power consumption.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present utility model;
Fig. 2 is the circuit theory diagrams of constant-current driven module;
Fig. 3 is the control signal sequential chart of control chip output.
In figure: 1, a LED particle, 2, the 2nd LED particle, 3, the 3rd LED particle, 4, control chip, 5, constant-current driven module, 6, the first switching tube, 7, second switch pipe, 8, the 3rd switching tube, 9, DC/DC drives chip.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of LED drive circuit of the present utility model, as shown in Figure 1, for driving LED lamp, LED lamp comprises the LED particle 1 glowing, the 2nd LED particle 2 of green light and the 3rd LED particle 3 of blue light-emitting, LED drive circuit comprises control chip 4, constant-current driven module 5, the first switching tube 6, second switch pipe 7 and the 3rd switching tube 8, the one LED particle 1, the first switching tube 6 and constant-current driven module 5 are connected into a loop, the 2nd LED particle 2, second switch pipe 7 and constant-current driven module 5 are connected into a loop, the 3rd LED particle 3, the 3rd switching tube 8 and constant-current driven module 5 are connected into a loop, control chip 4 respectively with the control end of constant-current driven module 5, the control end of the first switching tube 6, the control end electrical connection of the control end of second switch pipe 7 and the 3rd switching tube 8, control chip 4 is single-chip microcomputer.
As shown in Figure 2, constant-current driven module 5 comprises that DC/DC drives chip 9, electronic switch S, diode D, inductance L, capacitor C 1, capacitor C 2 and sampling resistor R, the input of electronic switch S is electrically connected with the first end of capacitor C 1 and the positive source of LED lamp, the second end ground connection of capacitor C 1, the output of electronic switch S is connected with the cathodic electricity of the first end of inductance L and diode D, the plus earth of diode D, the control end of electronic switch S drives the control signal output of chip 9 to be electrically connected with DC/DC, the second end of inductance L drives the voltage sample end of chip 9 to be electrically connected with the first end of capacitor C 2 and DC/DC, the second end ground connection of capacitor C 2, DC/DC drives the current sample end of chip 9 to be electrically connected with the first end of sampling resistor R, the second end ground connection of sampling resistor R, DC/DC drives the control signal input of chip 9 to be electrically connected with control chip 4, the first end of capacitor C 2 is as the output cathode of constant-current driven module 5, the first end of sampling resistor R is as the output negative pole of constant-current driven module 5.
Control chip calculates according to the dim signal receiving the size of current that constant-current driven module need be exported, and controls constant-current driven module work, thereby controls the brightness of LED lamp.Control three LED particle work according to the operating frequency f setting simultaneously.The work of three LED particles of control chip control is as follows: control chip goes out according to the toning calculated signals receiving the time that each LED particle will be lighted a work period T domestic demand, T=1/f=t1+ t2+ t3+ t4, t1 is the time that a LED particle need be lighted, t2 is the time that the 2nd LED particle need be lighted, t3 is the time that the 3rd LED particle need be lighted, and t4 is the time that constant-current driven module need turn-off.The first switching tube conducting t1 time of control chip control, control second switch pipe and the 3rd switching tube disconnects simultaneously, then, control the second switch pipe conducting t2 time, control the first switching tube and the 3rd switching tube disconnects simultaneously, then, controlled for the 3rd switching tube conducting t3 time, control the first switching tube and second switch pipe disconnects simultaneously, control subsequently the first switching tube, second switch pipe and the 3rd switching tube disconnect, control constant-current driven module quits work the t4 time simultaneously, finally, control chip control constant-current driven module is started working, the first switching tube conducting t1 time of control chip control, control second switch pipe and the 3rd switching tube disconnects simultaneously, so periodic duty.
As shown in Figure 3, PWM1 is the control signal of the first switching tube, and PWM2 is the control signal of second switch pipe, and PWM3 is the control signal of the 3rd switching tube.Multi-path LED load adopts sequential turn-on mode, only has at most a paths of LEDs load in conducting state simultaneously.Like this, electric current when every paths of LEDs loaded work piece is exactly the output current of constant-current driven module.Because constant-current driven module is constant current output type, electric current when every like this paths of LEDs loaded work piece is invariable.Because the conducting voltage of every paths of LEDs load is inconsistent, according to the specification material of LED manufacturer, the conduction voltage drop of different LED particle is known parameter, the conduction voltage drop of the LED particle glowing is about 2.1V, the conduction voltage drop of the 2nd LED particle of green light is about 2.9V, and the conduction voltage drop of the 3rd LED particle of blue light-emitting is about 3V.Like this, can, according to known conduction voltage drop, determine the control sequential of pwm signal, the control sequential of the pwm signal in this programme is progressively transitioned into the LED branch road of high conduction voltage drop by the LED branch road of low conduction voltage drop.First opens signal PWM1 is ruddiness conducting control signal, and second is opened signal PWM2 is green glow conducting control signal, and the 3rd is opened signal PWM3 is blue light conducting control signal.The object of doing is like this in low conduction voltage drop transient process, to cause current over pulse by high conduction voltage drop in order to prevent.
After the LED branch road of high conduction voltage drop has been opened, before next cycle is opened minimum conduction voltage drop LED branch road, introduce a Dead Time t4, in the t4 time period, control chip turn-offs constant-current driven module, allows output voltage decline, in the time that t4 finishes, control chip enables to open constant-current driven module, and constant-current driven module output current is increased to set point by 0, the current over pulse can avoid so minimum conduction voltage drop to open time.Control chip regulates ON time t1, t2 and the t3 of every paths of LEDs load, after mixed light is processed, and color, colour temperature and brightness that can free adjustment LED.

Claims (3)

1. a LED drive circuit, for driving LED lamp, described LED lamp comprises the LED particle (1) glowing, the 2nd LED particle (2) of green light and the 3rd LED particle (3) of blue light-emitting, it is characterized in that: described LED drive circuit comprises control chip (4), constant-current driven module (5), the first switching tube (6), second switch pipe (7) and the 3rd switching tube (8), a described LED particle (1), the first switching tube (6) and constant-current driven module (5) are connected into a loop, described the 2nd LED particle (2), second switch pipe (7) and constant-current driven module (5) are connected into a loop, described the 3rd LED particle (3), the 3rd switching tube (8) and constant-current driven module (5) are connected into a loop, described control chip (4) respectively with the control end of constant-current driven module (5), the control end of the first switching tube (6), the control end electrical connection of the control end of second switch pipe (7) and the 3rd switching tube (8).
2. a kind of LED drive circuit according to claim 1, it is characterized in that: described constant-current driven module (5) comprises that DC/DC drives chip (9), electronic switch S, diode D, inductance L, capacitor C 1, capacitor C 2 and sampling resistor R, the input of electronic switch S is electrically connected with the first end of capacitor C 1 and the positive source of LED lamp, the second end ground connection of capacitor C 1, the output of electronic switch S is connected with the cathodic electricity of the first end of inductance L and diode D, the plus earth of diode D, the control end of electronic switch S drives the control signal output of chip (9) to be electrically connected with DC/DC, the second end of inductance L drives the voltage sample end of chip (9) to be electrically connected with the first end of capacitor C 2 and DC/DC, the second end ground connection of capacitor C 2, DC/DC drives the current sample end of chip (9) to be electrically connected with the first end of sampling resistor R, the second end ground connection of sampling resistor R, DC/DC drives the control signal input of chip (9) to be electrically connected with control chip (4), the first end of capacitor C 2 is as the output cathode of constant-current driven module (5), the first end of sampling resistor R is as the output negative pole of constant-current driven module (5).
3. a kind of LED drive circuit according to claim 1 and 2, is characterized in that: described control chip (4) is single-chip microcomputer.
CN201420235889.7U 2014-05-09 2014-05-09 A kind of LED drive circuit Expired - Fee Related CN203934047U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104066237A (en) * 2014-05-09 2014-09-24 浙江凯耀智能照明科技有限公司 LED driving circuit and driving method
CN105764203A (en) * 2014-12-16 2016-07-13 海洋王照明科技股份有限公司 LED driving circuit with adjustable color temperature

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104066237A (en) * 2014-05-09 2014-09-24 浙江凯耀智能照明科技有限公司 LED driving circuit and driving method
CN105764203A (en) * 2014-12-16 2016-07-13 海洋王照明科技股份有限公司 LED driving circuit with adjustable color temperature

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C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: ZHEJIANG KAIYAO LIGHTING CO., LTD.

Free format text: FORMER NAME: ZHEJIANG KAIYAO INTELLIGENT LIGHTING SCIENCE + TECHNOLOGY CO., LTD.

CP01 Change in the name or title of a patent holder

Address after: 314400, Haining District, Zhejiang City, Jianshan province Jiaxing listening to tide Road, No. 12

Patentee after: Zhejiang Kaiyao Lighting Co., Ltd.

Address before: 314400, Haining District, Zhejiang City, Jianshan province Jiaxing listening to tide Road, No. 12

Patentee before: Zhejiang Kai Yao intelligent lighting Science and Technology Ltd.

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141105

Termination date: 20180509

CF01 Termination of patent right due to non-payment of annual fee