CN101711071A - LED control circuit and LED device - Google Patents
LED control circuit and LED device Download PDFInfo
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- CN101711071A CN101711071A CN200910109857A CN200910109857A CN101711071A CN 101711071 A CN101711071 A CN 101711071A CN 200910109857 A CN200910109857 A CN 200910109857A CN 200910109857 A CN200910109857 A CN 200910109857A CN 101711071 A CN101711071 A CN 101711071A
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Abstract
The invention provides an LED control circuit and an LED device, belonging to the field of the LED driving. The LED control circuit comprises a power supply module, a voltage stabilizing module, a switch module, an MCU control module, a triode and at least one LED driving module. When the electrical level of the input end of the LED driving module is more than or equal to the set threshold, the LED driving module outputs a constant-current control signal to control the constant current of an LED unit, and when the electrical level of the input end of the LED driving module is less than the set threshold, the LED driving module shuts off the output of the constant current, and the pulse control signal outputted by the MCU control module controls the LED unit to flicker at set frequency. The LED control circuit of the invention switches the constant current control and the flicker control of the LED unit by adopting the switch module, controls the LED unit to flicker by adopting the MCU control module which outputs the control signal of fixed pulse width and adjusts the work current of the LED unit in time by adopting the LED driving module, thereby controlling the constant current of the LED unit.
Description
Technical field
The invention belongs to LED and drive the field, relate in particular to a kind of LED control circuit and LED matrix.
Background technology
At present, adopt low-voltage direct current supply to exempt from isolated high power LED constant-current driving circuit and mainly contain two kinds: Fig. 1 shows the circuit diagram of the LED Drive and Control Circuit that prior art 1 provides; The LED Drive and Control Circuit comprises single-chip microcomputer 11 and BUCK circuit 12, wherein BUCK circuit 12 comprises metal-oxide-semiconductor Q0, inductance L 0, capacitor C 0 and diode D0, wherein the grid of metal-oxide-semiconductor Q0 is connected to the pwm control signal output 112 of single-chip microcomputer 11, the source electrode of metal-oxide-semiconductor Q0 is connected to power supply VCC, the drain electrode of metal-oxide-semiconductor Q0 is connected to the negative electrode of diode D0, the drain electrode of metal-oxide-semiconductor Q0 also is connected to an end of inductance L 0, the plus earth of diode D0, the other end of inductance L 0 is by capacitor C 0 ground connection, the other end of inductance L 0 also is connected to the positive pole of LED lamp 13, and the negative pole of LED lamp 13 is by sampling resistor R0 ground connection; The negative pole of LED lamp 13 also is connected to single-chip microcomputer 11 current and voltage signals sampling input 113; By sampling resistor R0 the electric current and the voltage that flow through LED lamp 13 are sampled, and feed back to single-chip microcomputer 11, utilize single-chip microcomputer 11 internal processes algorithms to carry out the PWM modulation then, the output current control signal is carried out constant current control to LED lamp 13.
The shortcoming of prior art 1 is: the constant current effect of LED lamp 13 is subjected to the otherness factor affecting of components and parts such as single-chip microcomputer 11, sample circuit bigger, when sample frequency and PWM frequency multiplying power occurs and concern, serious jitter phenomenon can appear in output current, at this moment just need in sample circuit, increase rational filter circuit, thereby cause the cost height, the circuit complexity.
Fig. 2 shows the circuit diagram of the LED Drive and Control Circuit that prior art 2 provides; The LED Drive and Control Circuit adopts special-purpose 14 pairs of LED lamps 13 of LDO analog chip to simulate regulation and control; Adopt this mode, be easy to control the light flash of LED lamp 13, the constant current effect is better; But efficient is lower, is occurring under the higher situation of short circuit and input voltage, and LDO analog chip 14 easily generates heat, even is burnt, and causes dangerous; The size of current that adopts LDO analog chip 14 to cause exporting to LED lamp 13 is simultaneously fixed, and can't regulate the Constant Electric Current flow valuve of output; The driving bearing power is less, and single chip can drive 1.5 watts with interior load.
Summary of the invention
The object of the present invention is to provide a kind of LED control circuit that can carry out constant current control and flicker control simultaneously to high-powered LED lamp.
The embodiment of the invention is achieved in that a kind of LED control circuit, and described LED control circuit comprises:
Power module;
Voltage stabilizing module, its input is connected to the output of described power module, and the voltage that described power module is exported carries out exporting after the voltage stabilizing;
Switch module, its first end is connected to the output of described Voltage stabilizing module by the first divider resistance R1, second end of described switch module is connected to the output of described Voltage stabilizing module by the second divider resistance R2, the 3rd end of described switch module is by the 3rd divider resistance R3 ground connection, conducting between the conducting or second end and the 3rd end between first end of described switch module and the 3rd end;
The MCU control module, its power end is connected to the output of described Voltage stabilizing module, and the input of described MCU control module receives outside control signal, according to the control signal output pulse control signal of outside;
Triode, its base stage is connected to the output of described MCU control module, the grounded emitter of described triode, the collector electrode of described triode is connected to the 3rd end of described switch module; And
At least one LED driver module, the power end of each LED driver module is connected to the output of described power module, and the input of each LED driver module is connected to the link that the collector electrode of described triode is connected with the 3rd end of described switch module; The output of each LED driver module connects the LED unit;
When the level of described LED driver module input during more than or equal to preset threshold, described LED driver module output constant current control signal is carried out constant current control to described LED unit; When the level of the input of described LED driver module during less than preset threshold, described LED driver module is closed constant current output, the frequency scintillation of pulse control signal control LED unit to set of described MCU control module output.
Further, described switch module comprises: double-point double-throw switch, its first end 1 is connected to the output of described Voltage stabilizing module by the first divider resistance R1, second end 2 that described dpdt double-pole double-throw (DPDT) is opened is connected to the output of described Voltage stabilizing module by the second divider resistance R2, the 3rd end 3 that described dpdt double-pole double-throw (DPDT) is opened is by the 3rd divider resistance R3 ground connection, the 4th end 4 ground connection that described dpdt double-pole double-throw (DPDT) is opened, five terminal 5 that described dpdt double-pole double-throw (DPDT) is opened and the 6th end 6 are connected to the negative pole of output end of described power module respectively; When described double-point double-throw switch when left-handed, the 3rd end and first termination are logical, the 4th end and five terminal connection; When described double-point double-throw switch during to dextrorotation, the 3rd end and second termination are logical, and the 4th end and the 6th termination are led to.
Further, described triode is a NPN type triode.
Further, described LED driver module comprises: an end of sampling resistor, diode D3, the described sampling resistor of inductance L 5 and constant current unit is connected to the output of described power module, the other end of described sampling resistor is connected to the current sample end of described constant current unit, and the other end of described sampling resistor is connected to the positive pole of LED unit; The negative electrode of described diode is connected to the output of described power module, and the anode of described diode is connected to the constant flow regulation PWM control end of described constant current unit; One end of described inductance is connected to the negative pole of described LED unit, and the other end of described inductance is connected to the constant flow regulation PWM control end of described constant current unit; The power end of described constant current unit is connected to the output of described power module, the ground end ground connection of described constant current unit, and the analog level sampling end of described constant current unit is connected to the link that second end of described triode is connected with the 3rd end of described switch module.
Further, described LED unit comprises: a plurality of series connection or LED lamp in parallel.
Another purpose of the embodiment of the invention also is to provide a kind of LED matrix, and described LED matrix comprises above-mentioned LED control circuit and the LED unit that is connected with each LED driver module.
LED control circuit provided by the invention adopts the switching between switch module realization constant current control and the flicker control, by the control signal of MCU control module output fixed pulse width, and the flicker control of realization LED unit; Adopt the LED driver module that the operating current of LED unit is adjusted in real time simultaneously, to reach the purpose of constant current control.
Description of drawings
Fig. 1 is the circuit diagram of the LED Drive and Control Circuit that provides of prior art 1;
Fig. 2 is the circuit diagram of the LED Drive and Control Circuit that provides of prior art 2;
Fig. 3 is the circuit diagram of the LED control circuit that provides of the embodiment of the invention;
Fig. 4 is the square waveform schematic diagram of MCU control module output in the LED control circuit that provides of the embodiment of the invention;
Fig. 5 is the circuit diagram of the LED matrix 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 control circuit that the embodiment of the invention provides adopts the switching between switch module realization constant current control and the flicker control, by the control signal of MCU control module output fixed pulse width, and the flicker control of realization LED unit; Adopt the LED driver module that the operating current of LED unit is adjusted in real time simultaneously, to reach the purpose of constant current control.
Fig. 3 shows the circuit diagram of the LED control 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.
The LED control circuit comprises: power module 20, Voltage stabilizing module 21, switch module 22, MCU control module 23, triode Q and LED driver module 24; Wherein the input of Voltage stabilizing module 21 is connected to the output of power module, and the voltage that power module is exported carries out exporting after the voltage stabilizing; First end of switch module 22 is connected to the output of Voltage stabilizing module 21 by the first divider resistance R1, second end of switch module 22 is connected to the output of Voltage stabilizing module 21 by the second divider resistance R2, the 3rd end of switch module 22 is by the 3rd divider resistance R3 ground connection, conducting between the conducting or second end and the 3rd end between first end of switch module 22 and the 3rd end; The power end of MCU control module 23 is connected to the output of Voltage stabilizing module 21, and the input of MCU control module 23 receives outside control signal, according to the control signal output pulse control signal of outside; The base stage of triode Q is connected to the output of MCU control module 23, the grounded emitter of triode Q, and the collector electrode of triode Q is connected to the 3rd end of switch module 23; LED driver module 24 power ends are connected to the output of power module 20, and the input of LED driver module 24 is connected to the link S1 that the collector electrode of triode Q is connected with the 3rd end of switch module 22.The output of LED driver module 24 connects LED unit 30; When the level of LED driver module 24 inputs during more than or equal to preset threshold, LED driver module 24 output constant current control signals are carried out constant current control to LED unit 30; When the level of the input of LED driver module 24 during less than preset threshold, LED driver module 24 is closed constant current output, the frequency scintillation of pulse control signal control LED unit to set of MCU control module 23 outputs.
In embodiments of the present invention, switch module 22 comprises: double-point double-throw switch K1, it comprises 6 terminals, first end 1 is connected to the output of Voltage stabilizing module 21 by the first divider resistance R1, second end 2 of double-point double-throw switch K1 is connected to the output of Voltage stabilizing module 21 by the second divider resistance R2, the 3rd end 3 of double-point double-throw switch K1 is by the 3rd divider resistance R3 ground connection, the 4th end 4 ground connection of double-point double-throw switch K1, the five terminal 5 of double-point double-throw switch K1 and the 6th end 6 are connected to the negative pole of output end of power module 20 respectively; When double-point double-throw switch K1 when left-handed, the 3rd end 3 and first end 1 are connected, the 4th end 4 and five terminal 5 connections; As double-point double-throw switch K1 during to dextrorotation, the 3rd end 3 and second end 2 are connected, the 4th end 4 and 6 connections of the 6th end.Adopt double-point double-throw switch K1, when holding state, the 4th end 4 and the five terminal 5 of double-point double-throw switch K1 are disconnected, and the 4th end 4 and the 6th end 6 are also disconnected, and have so just avoided the generation of leakage current, have prolonged stand-by time greatly.
In embodiments of the present invention, triode Q can adopt other switching components replacements such as metal-oxide-semiconductor.
In embodiments of the present invention, LED driver module 24 comprises: sampling resistor Rsense, diode D3, inductance L 5 and constant current unit U; Wherein, the end of sampling resistor Rsense is connected to the output head anode of power module 20, and the other end of sampling resistor Rsense is connected to the current sample end Isense of constant current unit U, and the other end of sampling resistor Rsense is connected to the positive pole of LED unit 30; The negative electrode of diode D3 is connected to the output head anode of power module 20, the anode of diode D3 is connected to the constant flow regulation PWM control end LX of constant current unit U, one end of inductance L 5 is connected to the negative pole of LED unit 30, the other end of inductance L 5 is connected to the constant flow regulation PWM control end LX of constant current unit U, the power end Vin of constant current unit U is connected to the output of power module 20, the ground end GND ground connection of constant current unit U, the analog level input ADJ of constant current unit U is connected to the link S1 that the collector electrode of triode Q is connected with the 3rd end of switch module 22.
In embodiments of the present invention, LED unit 30 can or compose in parallel by a plurality of LED lamp series connection, generally gets 4-8 LED lamp and is composed in series a LED unit 30.
The LED control circuit that the embodiment of the invention provides utilizes the break-make of double-point double-throw switch K1 control main circuit, carries out circuit output simultaneously and selects; Utilize MCU control module 23 Control current to carry out break-make, thereby reach the effect of control LED lamp flicker with fixed frequency and pulse duration; Thereby utilization has the constant current chip U of AD analog input voltage signal interface adjusts output current size realization constant current control.
For the LED control circuit that illustrates that further the embodiment of the invention provides, it is as follows now in conjunction with Fig. 3 in detail its operation principle to be described in detail; For convenience of explanation, switch module 22 adopts double-point double-throw switch K1, and triode Q adopts NPN type triode Q.
The DC power supply of power module 20 outputs is through after Voltage stabilizing module 21 voltage stabilizings of 5V being 23 power supplies of MCU control module, be the first divider resistance R1 simultaneously, the second divider resistance R2 and the 3rd divider resistance R3 provide a stable voltage, when double-point double-throw switch K1 is left-handed, the 3rd end 3 of K1 and first end 1 are connected, and the 4th end 4 of K1 and five terminal 5 are connected, and promptly the first divider resistance R1 and the 3rd divider resistance R3 form and divide hydraulic circuit, the negative pole of output end ground connection of power module 20, power connection; The whole LED control circuit is started working, square wave of MCU control module 23 outputs with certain duty ratio, the waveform schematic diagram of this square wave is as shown in Figure 4: when square wave is in 0～t1, MCU control module 23 output high level signals, triode Q conducting, the collector electrode of triode Q is pulled to ground, the 3rd divider resistance R3 is by short circuit, the level that is input to the ADJ pin of constant current unit U is 0, and LED driver module 24 is closed, and does not work in LED unit 30; When square wave is in t1～t2, MCU control module 23 output low level signals, not conducting of triode Q, the level that is input to the ADJ pin of constant current unit U is Vadj=5 * [R1/ (R1+R3))], constant current unit U carries out automatic output current size according to the magnitude of voltage of input, and establishing this current value is Iout=(Vadj/1.25) * (0.1/Rsense), and then the LED control circuit is in running order, the frequency of the operating current I1 of output is by 23 controls of MCU control module, and duty ratio is (t2-t1)/t2.
When double-point double-throw switch K1 dextrorotation, the 3rd end 3 of K1 and second end 2 are connected, and the 4th end 4 of K1 and the 6th end 6 are connected, and promptly the second divider resistance R2 and the 3rd divider resistance R3 form and divide hydraulic circuit, the negative pole of output end ground connection of power module 20, power connection; The LED control circuit is started working; The level that is input to the ADJ pin of constant current unit U is Vadj=5 * [R2/ (R2+R3))], constant current unit U carries out automatic output current size according to the magnitude of voltage of input, if this current value is Iout=(Vadj/1.25) * (0.1/Rsense), then the LED control circuit is in running order, the frequency of the operating current Iout of output is by 23 controls of MCU control module, and duty ratio is (t2-t1)/t2.Just can realize controlling the big or small Iout of constant current unit U output current by regulating resistance.
By constant current unit U LED unit 30 is carried out constant current control, the constant current of its output can be calculated by following formula: Iout=(Vadj/1.25) * (0.1/Rsense), the size that the level of the analog level sampling end ADJ pin by constant current unit U and the resistance of resistance R sense are come common set with constant current; And when the incoming level of ADJ pin was lower than 0.2V, constant current unit U closed output; Set flicker frequency and the pulse duration of LED unit 30 by the pulse control signal of MCU control module 23 output this moment, and the maximum constant current value of (when the LED lamp lights) is then controlled by the level size of the analog level sampling end ADJ pin of constant current unit U during 30 flickers of LED unit.
In embodiments of the present invention, it is the LED constant current control chip of ZXLD1362 that constant current unit U can adopt model, the level equalization of the ADJ pin of this chip, and voltage accuracy can be controlled in 1%, makes that this chip can the stabilized treatment constant current; The design constant current accuracy of the unit U of constant current simultaneously can reach in 2%; Entire circuit is anti-interference by force like this, the electric current shake is less, can realize accurately controlling constant current.
In embodiments of the present invention, when the LED control circuit need drive more great power LED, LED matrix can adopt mode shown in Figure 5 n A1 module in parallel, as long as the voltage height of the supply voltage specific output of input A1 module in parallel, the total current that source current can provide output in theory can infinite side by side much power LEDs under the voltage and current value that constant current unit U allows; Wherein the A1 module comprises LED unit and the LED driver module that is connected with the LED unit, and n is the positive integer more than or equal to 2; The physical circuit and the operation principle of LED driver module are described in front, do not repeat them here.
LED control circuit provided by the invention adopts the switching between switch module realization constant current control and the flicker control, by the control signal of MCU control module output fixed pulse width, and the flicker control of realization LED unit; Adopt the LED driver module that the operating current of LED unit is adjusted in real time simultaneously, to reach the purpose of constant current control.
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 (6)
1. a LED control circuit is characterized in that, described LED control circuit comprises:
Power module;
Voltage stabilizing module, its input is connected to the output of described power module, and the voltage that described power module is exported carries out exporting after the voltage stabilizing;
Switch module, its first end is connected to the output of described Voltage stabilizing module by the first divider resistance R1, second end of described switch module is connected to the output of described Voltage stabilizing module by the second divider resistance R2, the 3rd end of described switch module is by the 3rd divider resistance R3 ground connection, conducting between the conducting or second end and the 3rd end between first end of described switch module and the 3rd end;
The MCU control module, its power end is connected to the output of described Voltage stabilizing module, and the input of described MCU control module receives outside control signal, according to the control signal output pulse control signal of outside;
Triode, its base stage is connected to the output of described MCU control module, the grounded emitter of described triode, the collector electrode of described triode is connected to the 3rd end of described switch module; And
At least one LED driver module, the power end of each LED driver module is connected to the output of described power module, and the input of each LED driver module is connected to the link that the collector electrode of described triode is connected with the 3rd end of described switch module; The output of each LED driver module connects the LED unit;
When the level of described LED driver module input during more than or equal to preset threshold, described LED driver module output constant current control signal is carried out constant current control to described LED unit; When the level of the input of described LED driver module during less than preset threshold, described LED driver module is closed constant current output, the frequency scintillation of pulse control signal control LED unit to set of described MCU control module output.
2. LED control circuit as claimed in claim 1 is characterized in that, described switch module comprises:
Double-point double-throw switch, its first end (1) is connected to the output of described Voltage stabilizing module by the first divider resistance R1, second end (2) that described dpdt double-pole double-throw (DPDT) is opened is connected to the output of described Voltage stabilizing module by the second divider resistance R2, the 3rd end (3) that described dpdt double-pole double-throw (DPDT) is opened is by the 3rd divider resistance R3 ground connection, the 4th end (4) ground connection that described dpdt double-pole double-throw (DPDT) is opened, five terminal (5) that described dpdt double-pole double-throw (DPDT) is opened and the 6th end (6) are connected to the negative pole of output end of described power module respectively;
When described double-point double-throw switch when left-handed, the 3rd end (3) and first end (1) are connected, the 4th end (4) is connected with five terminal (5);
When described double-point double-throw switch during to dextrorotation, the 3rd end (3) is connected with second end (2), and the 4th end (4) is connected with the 6th end (6).
3. LED control circuit as claimed in claim 1 is characterized in that, described triode is a NPN type triode.
4. LED control circuit as claimed in claim 1 is characterized in that, described LED driver module comprises:
Sampling resistor, diode D3, inductance L 5 and constant current unit
One end of described sampling resistor is connected to the output of described power module, and the other end of described sampling resistor is connected to the current sample end of described constant current unit, and the other end of described sampling resistor is connected to the positive pole of LED unit;
The negative electrode of described diode is connected to the output of described power module, and the anode of described diode is connected to the constant flow regulation PWM control end of described constant current unit;
One end of described inductance is connected to the negative pole of described LED unit, and the other end of described inductance is connected to the constant flow regulation PWM control end of described constant current unit;
The power end of described constant current unit is connected to the output of described power module, the ground end ground connection of described constant current unit, and the analog level sampling end of constant current unit is connected to the link that second end of described triode is connected with the 3rd end of described switch module.
5. LED control circuit as claimed in claim 1 is characterized in that, described LED unit comprises: a plurality of series connection or LED lamp in parallel.
6. a LED matrix is characterized in that, described LED matrix comprises each described LED control circuit of claim 1-5 and the LED unit that is connected with each LED driver module.
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| CN102595676A (en) * | 2011-01-06 | 2012-07-18 | 亿广科技(上海)有限公司 | LED illumination driving control circuit |
| CN103327696A (en) * | 2013-07-02 | 2013-09-25 | 深圳市华星光电技术有限公司 | LED backlight driving circuit, driving method thereof and liquid crystal display device |
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| US9373284B2 (en) | 2013-07-02 | 2016-06-21 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, LCD device, and method for driving the LED backlight driving circuit |
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| CN108633154A (en) * | 2018-04-28 | 2018-10-09 | 常州星宇车灯股份有限公司 | A kind of high-power low-loss constant-current supply control module |
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