CN102883499A - LED (light-emitting diode) silicon-controlled power supply and constant current control circuit - Google Patents
LED (light-emitting diode) silicon-controlled power supply and constant current control circuit Download PDFInfo
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- CN102883499A CN102883499A CN2011102197754A CN201110219775A CN102883499A CN 102883499 A CN102883499 A CN 102883499A CN 2011102197754 A CN2011102197754 A CN 2011102197754A CN 201110219775 A CN201110219775 A CN 201110219775A CN 102883499 A CN102883499 A CN 102883499A
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Abstract
The invention belongs to the field of current control and provides an LED (light-emitting diode) silicon-controlled power supply and a constant current control circuit of the LED silicon-controlled power supply. A current sampling unit, a first voltage dividing unit, a reference voltage generation unit, a second voltage dividing unit, a filtering unit, and operational amplifier unit and a current feedback unit match with a current supplying and adjusting circuit, thus the constant-current control of the LED load working current is realized, and the problem of the LED silicon-controlled driving power supply that the constant current output can not be realized is solved.
Description
Technical field
The invention belongs to the Current Control field, relate in particular to a kind of LED thyristor supply and constant-current control circuit thereof.
Background technology
At present, drive control field at LED, adopt the controllable silicon driving power of firm power control circuit to rely on its good dimming effect and the low advantage of cost and be widely used.Yet, under the prerequisite of LED controllable silicon driving power output firm power, because different LED has different rated operational voltage values separately, and different user can increase or reduce the quantity of LED according to actual needs when using LED, corresponding the changing of output voltage meeting of LED controllable silicon driving power, the variation of output voltage then must bring the variation of output current.If the variation of output current is too large or exceed the load current value of LED, then can causes useful life of LED greatly to shorten even damage.In order to realize the excess current control to LED controllable silicon driving power; prior art increases a current foldback circuit in originally disposing the LED controllable silicon driving power of firm power control circuit; but it only has the overcurrent protection effect, can not really realize the purpose of constant current output.Therefore, there is the problem that can't realize constant current output in existing LED controllable silicon driving power.
Summary of the invention
The object of the present invention is to provide a kind of constant-current control circuit, be intended to solve the problem that can't realize constant current output that existing LED controllable silicon driving power exists.
The present invention is achieved in that a kind of constant-current control circuit, comprises electric current supply and Circuit tuning, and described electric current supply is connected with the LED load with Circuit tuning, it is characterized in that, described constant-current control circuit comprises:
Current sampling unit, the output of input termination described LED load, output is connected with the loop end of Circuit tuning with described electric current supply, samples for the electric current to the output of LED load;
The first partial pressure unit, the output of the input described electric current supply of termination and Circuit tuning is used for the output DC of described electric current supply and Circuit tuning is carried out dividing potential drop;
The reference voltage generation unit, the first output of described the first partial pressure unit of input termination is used for generating the 2.5V reference voltage;
The second partial pressure unit, the output of the described reference voltage generation unit of input termination is used for described 2.5V reference voltage is carried out exporting a reference voltage after the dividing potential drop;
Filter unit, the input of the described current sampling unit of input termination is used for the sample rate current of described current sampling unit output is carried out the filtering processing;
The operation amplifier unit, first input end connects the output of described filter unit, the output of described the second partial pressure unit of the second input termination, the second output of described the first partial pressure unit of power supply termination is used for voltage and the described reference voltage of the sample rate current processed through described filtering unit filters are compared and enlarged;
The current feedback unit, first input end connects the second output of described the first partial pressure unit, the output of the described operation amplifier of the second input termination unit, the test side of the output described electric current supply of termination and Circuit tuning is used for the situation of change of described LED loaded work piece electric current is fed back to described electric current supply and Circuit tuning.
In the present invention, by adopting described current sampling unit, described the first partial pressure unit, described reference voltage generation unit, described the second partial pressure unit, described filter unit, described operation amplifier unit and described current feedback unit and described electric current supply to match with Circuit tuning, realize the constant current control to LED loaded work piece electric current, solved the problem that can't realize constant current output that existing LED controllable silicon driving power exists.
Description of drawings
Fig. 1 is the modular structure figure of the constant-current control circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit figure of the constant-current control circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
In embodiments of the present invention, by electric current supply and Circuit tuning the direct current that the current feedback unit feeds back is received, and the rated working current value of the galvanic current value that will receive and LED load compares, to adjust the current value of its output DC, realize the purpose of constant current control.
Fig. 1 shows the modular structure of the constant-current control circuit that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention, and details are as follows:
A kind of constant-current control circuit, comprise electric current supply and Circuit tuning 100, electric current supply is connected with LED load 900 with Circuit tuning 100, the output OUT+ of electric current supply and Circuit tuning 100 connects the input of LED load 900, and the loop end OUT-of electric current supply and Circuit tuning 100 connects equipotential ground.
Constant-current control circuit also comprises:
The first partial pressure unit 300, the output OUT+ of input termination electric current supply and Circuit tuning 100 is used for the output DC of electric current supply and Circuit tuning 100 is carried out dividing potential drop;
Reference voltage generation unit 400, the first output of input termination the first partial pressure unit 200 is used for generating the 2.5V reference voltage;
The second partial pressure unit 500, the output of input termination reference voltage generation unit 400 is used for the 2.5V reference voltage is carried out exporting a reference voltage after the dividing potential drop;
Because electric current supply and Circuit tuning 100 in above-mentioned constant-current control circuit are common circuit of LED thyristor supply, therefore, no longer its internal circuit structure is described in detail in embodiments of the present invention.
Fig. 2 shows the exemplary circuit structure of the constant-current control circuit that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention, and details are as follows:
As one embodiment of the invention, current sampling unit 200 comprises sampling resistor R1 and sampling resistor R2, the first end of sampling resistor R1 and the second end are respectively input and the output of current sampling unit 200, and sampling resistor R2 is connected between the first end and the second end of sampling resistor R1.
As one embodiment of the invention, the first partial pressure unit 300 comprises divider resistance R3 and divider resistance R5, the first end of divider resistance R3 and the second end are respectively input and first output of the first partial pressure unit 300, the second end of the first termination divider resistance R3 of divider resistance R5, the second end of divider resistance R5 are the second output of the first partial pressure unit 300.
As one embodiment of the invention, reference voltage generation unit 400 comprises resistance R 4 and reference voltage source U3, the first end of resistance R 4 and the second end are respectively input and the output of reference voltage generation unit 400, the second end of resistance R 4 simultaneously with the negative electrode of reference voltage source U3 be connected with reference to the utmost point, the anode of reference voltage source U3 connects equipotential ground.
As one embodiment of the invention, the second partial pressure unit 500 comprises divider resistance R10 and divider resistance R11, the first end of divider resistance R10 and the second end are respectively input and the output of the second partial pressure unit 500, and divider resistance R11 is connected between the second end and equipotential ground of divider resistance R10.
As one embodiment of the invention, filter unit 600 comprises resistance R 9 and capacitor C 2, and the first end of resistance R 9 and the second end are respectively input and the output of filter unit 600, and capacitor C 2 is connected between second end and equipotential ground of resistance R 9.
As one embodiment of the invention, operation amplifier unit 700 comprises operational amplifier U2, resistance R 8 and capacitor C 1, the inverting input of operational amplifier U2, in-phase input end, positive power source terminal and output are respectively first input end, the second input, power end and the output of operation amplifier unit 700, the negative supply termination equipotential ground of operational amplifier U2, the inverting input of the first termination operational amplifier U2 of resistance R 8, capacitor C 1 are connected between the output of the second end of resistance R 8 and operational amplifier U2.
As one embodiment of the invention, current feedback unit 800 comprises resistance R 6, resistance R 7, photoelectrical coupler U1 and resistance R 12, the first end of resistance R 6 is the first input end of current feedback unit 800, the anode of light-emitting diode among the second termination photoelectrical coupler U1 of resistance R 6, resistance R 7 is connected between the anode and negative electrode of light-emitting diode among the photoelectrical coupler U1, the negative electrode of light-emitting diode is the second input of current feedback unit 800 among the photoelectrical coupler U1, the current collection of the phototriode output of current feedback unit 800 very among the photoelectrical coupler U1, the grounded emitter of phototriode among the photoelectrical coupler U1, resistance R 12 are connected between the collector electrode and emitter of phototriode among the photoelectrical coupler U1.
As one embodiment of the invention, LED load 900 comprises LED 1 and LED 2, the anode of LED 1 is the input of LED load, the anode of the negative electrode sending and receiving optical diode LED2 of LED 1, the negative electrode of LED 2 is the output of LED load.
The operation principle of constant-current control circuit is as follows:
Electric current supply and Circuit tuning 100 provide direct current by its output for LED load 900, divider resistance R3 obtains direct current and will export after its dividing potential drop from the anode of LED 1, divider resistance R5 carries out behind the second divided voltage the direct current that carries out dividing potential drop by divider resistance R3 and provides driving voltage for operational amplifier U2, reference voltage source U3 obtains through generating the 2.5V reference voltage behind the direct current of divider resistance R3 dividing potential drop by resistance R 4, divider resistance R10 and divider resistance R11 form bleeder circuit, after the 2.5V reference voltage that obtains from reference voltage source U3 carried out dividing potential drop, export a reference voltage from the first end of divider resistance R10 to the in-phase input end of operational amplifier U2, sampling resistor R1 and sampling resistor R2 form current sampling circuit and obtain sample rate current from LED load output, after resistance R 9 and capacitor C 2 formation filter circuits carry out the filtering processing to sample rate current, inverting input with its input operational amplifier U2, operational amplifier U2 is to comparing and enlarging by the reference voltage of its in-phase input end input with by the voltage of the sample rate current of its inverting input input, resistance R 8 forms the feedback compensation circuit with capacitor C 1, guarantees the steady operation of operational amplifier U2.
When the output current of electric current supply and Circuit tuning during greater than the constant working current value of predefined LED load 900, the voltage of the sample rate current of the inverting input of operational amplifier U2 will increase, thereby its output voltage is increased, so, the voltage difference at light-emitting diode two ends reduces among the photoelectrical coupler U1, the operating current of this light-emitting diode reduces, luminous intensity weakens, therefore, equivalent resistance among the photoelectrical coupler U1 between collector and emitter reduces, after the voltage that the test side FB of electric current supply and Circuit tuning 100 detects current feedback unit 800 outputs reduces, can reduce the electric current of its output, make its output current remain on the state identical with the constant operating current of LED load 900, guarantee the normal operation of LED load 900; When the output current of electric current supply and Circuit tuning 100 during less than the rated operational current of LED load 900, the collector current of phototriode increases among the photoelectrical coupler U1, after the collector current of test side FB phototriode in detecting photoelectrical coupler U1 of electric current supply and Circuit tuning 100 increases, can increase the electric current of himself output, make its output current remain on the state identical with the constant operating current of LED load 900, guarantee the normal operation of LED load 900.
The embodiment of the invention also provides a kind of LED thyristor supply that comprises above-mentioned constant-current control circuit.
In the present invention, by adopting current sampling unit 200, the first partial pressure unit 300, reference voltage generation unit 400, the second partial pressure unit 500, filter unit 600, operation amplifier unit 700 and current feedback unit 800 and electric current supply to match with Circuit tuning 100, realized the constant current control of the operating current of LED load 900 has been solved the problem that can't realize constant current output that existing LED controllable silicon driving power exists.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing 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 (9)
1. a constant-current control circuit comprises electric current supply and Circuit tuning, and described electric current supply is connected with the LED load with Circuit tuning, it is characterized in that, described constant-current control circuit also comprises:
Current sampling unit, the output of input termination described LED load, output is connected with the loop end of Circuit tuning with described electric current supply, samples for the electric current to the output of LED load;
The first partial pressure unit, the output of the input described electric current supply of termination and Circuit tuning is used for the output DC of described electric current supply and Circuit tuning is carried out dividing potential drop;
The reference voltage generation unit, the first output of described the first partial pressure unit of input termination is used for generating the 2.5V reference voltage;
The second partial pressure unit, the output of the described reference voltage generation unit of input termination is used for described 2.5V reference voltage is carried out exporting a reference voltage after the dividing potential drop;
Filter unit, the input of the described current sampling unit of input termination is used for the sample rate current of described current sampling unit output is carried out the filtering processing;
The operation amplifier unit, first input end connects the output of described filter unit, the output of described the second partial pressure unit of the second input termination, the second output of described the first partial pressure unit of power supply termination is used for voltage and the described reference voltage of the sample rate current processed through described filtering unit filters are compared and enlarged;
The current feedback unit, first input end connects the second output of described the first partial pressure unit, the output of the described operation amplifier of the second input termination unit, the test side of the output described electric current supply of termination and Circuit tuning is used for the situation of change of described LED loaded work piece electric current is fed back to described electric current supply and Circuit tuning.
2. constant-current control circuit as claimed in claim 1, it is characterized in that, described current sampling unit comprises sampling resistor R1 and sampling resistor R2, the first end of described sampling resistor R1 and the second end are respectively input and the output of described current sampling unit, and described sampling resistor R2 is connected between the first end and the second end of described sampling resistor R1.
3. constant-current control circuit as claimed in claim 1, it is characterized in that, described the first partial pressure unit comprises divider resistance R3 and divider resistance R5, the first end of described divider resistance R3 and the second end are respectively input and first output of described the first partial pressure unit, the second end of the described divider resistance R3 of the first termination of described divider resistance R5, the second end of described divider resistance R5 is the second output of described the first partial pressure unit.
4. constant-current control circuit as claimed in claim 1, it is characterized in that, described reference voltage generation unit comprises resistance R 4 and reference voltage source U3, the first end of described resistance R 4 and the second end are respectively input and the output of described reference voltage generation unit, the second end of described resistance R 4 simultaneously with the negative electrode of described reference voltage source U3 be connected with reference to the utmost point, the anode of described reference voltage source U3 connects equipotential ground.
5. constant-current control circuit as claimed in claim 1, it is characterized in that, described the second partial pressure unit comprises divider resistance R10 and divider resistance R11, the first end of described divider resistance R10 and the second end are respectively input and the output of described the second partial pressure unit 500, and described divider resistance R11 is connected between the second end and equipotential ground of described divider resistance R10.
6. constant-current control circuit as claimed in claim 1, it is characterized in that, described filter unit comprises resistance R 9 and capacitor C 2, the first end of described resistance R 9 and the second end are respectively input and the output of described filter unit, and described capacitor C 2 is connected between second end and equipotential ground of described resistance R 9.
7. constant-current control circuit as claimed in claim 1, it is characterized in that, described operation amplifier unit comprises operational amplifier U2, resistance R 8 and capacitor C 1, the inverting input of described operational amplifier U2, in-phase input end, positive power source terminal and output are respectively the first input end of described operation amplifier unit, the second input, power end and output, the negative supply termination equipotential ground of described operational amplifier U2, the inverting input of the described operational amplifier U2 of the first termination of described resistance R 8, described capacitor C 1 are connected between the output of the second end of described resistance R 8 and described operational amplifier U2.
8. constant-current control circuit as claimed in claim 1, it is characterized in that, described current feedback unit comprises resistance R 6, resistance R 7, photoelectrical coupler U1 and resistance R 12, the first end of described resistance R 6 is the first input end of described current feedback unit, the anode of light-emitting diode among the described photoelectrical coupler U1 of the second termination of described resistance R 6, described resistance R 7 is connected between the anode and negative electrode of light-emitting diode among the described photoelectrical coupler U1, the negative electrode of light-emitting diode is the second input of described current feedback unit among the described photoelectrical coupler U1, the output of the very described current feedback of the current collection unit of phototriode among the described photoelectrical coupler U1, the grounded emitter of phototriode among the described photoelectrical coupler U1, described resistance R 12 is connected between the collector electrode and emitter of phototriode among the described photoelectrical coupler U1.
9. a LED thyristor supply is characterized in that, described LED thyristor supply comprises such as each described constant-current control circuit of claim 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102197754A CN102883499A (en) | 2011-08-02 | 2011-08-02 | LED (light-emitting diode) silicon-controlled power supply and constant current control circuit |
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| CN2011102197754A CN102883499A (en) | 2011-08-02 | 2011-08-02 | LED (light-emitting diode) silicon-controlled power supply and constant current control circuit |
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| CN103702490A (en) * | 2014-01-02 | 2014-04-02 | 张洪为 | Self-adaptation standard constant current source LED (light emitting diode) driving device and method |
| CN104955230A (en) * | 2015-06-12 | 2015-09-30 | 来安县新元机电设备设计有限公司 | Backlight source control circuit and display terminal |
| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
| CN106658843A (en) * | 2016-10-24 | 2017-05-10 | 深圳市纽艾迪电子科技有限公司 | Light-controlled LED drive circuit and infrared night vision camera system |
| CN107272810A (en) * | 2017-07-31 | 2017-10-20 | 绵阳市维博电子有限责任公司 | A kind of reference voltage source temperature drift compensation conditioned circuit |
| CN107908218A (en) * | 2017-12-15 | 2018-04-13 | 杰华特微电子（杭州）有限公司 | Power circuit and its control method |
| CN109152149A (en) * | 2018-10-13 | 2019-01-04 | 深圳市比尔达科技有限公司 | Self-adapting detecting firm power exports emergency power supply control circuit and its emergency power supply |
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| CN109152149A (en) * | 2018-10-13 | 2019-01-04 | 深圳市比尔达科技有限公司 | Self-adapting detecting firm power exports emergency power supply control circuit and its emergency power supply |
| CN109152149B (en) * | 2018-10-13 | 2024-04-19 | 深圳市比尔达科技有限公司 | Self-adaptive detection constant power output emergency power supply control circuit and emergency power supply thereof |
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Application publication date: 20130116 |