CN102695320B - Constant-current drive circuit - Google Patents
Constant-current drive circuit Download PDFInfo
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- CN102695320B CN102695320B CN201110071971.1A CN201110071971A CN102695320B CN 102695320 B CN102695320 B CN 102695320B CN 201110071971 A CN201110071971 A CN 201110071971A CN 102695320 B CN102695320 B CN 102695320B
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Abstract
The present invention relates to a kind of constant-current drive circuit, comprise power supply and driven LED, wherein also comprise the control chip for sending pwm control signal according to input signal; For controlling the switching tube of the constant current size of described constant-current drive circuit and the output circuit for described constant current being exported the described LED of driving according to described pwm control signal; Described control chip is connected with the control end of described switching tube, and the input of described switching tube is connected with described power supply, and the output of described switching tube is connected with described output circuit.Constant-current drive circuit structure of the present invention is simple, drive current controls conveniently, cost is low and favorable expandability, overcomes the defect that the complex circuit designs of the existing constant-current drive circuit for mancarried device, drive current control difficulty and cost are high.
Description
Technical field
The present invention relates to circuit application field, more particularly, relate to a kind of adjustable constant-flow drive circuit being applied to mancarried device.
Background technology
Along with the development of society, various portable devices (as flashlight) more and more obtain the use of numerous people, for the ease of carrying, the battery that the power supply of these devices generally adopts direct current to export is as power supply, but some battery causes output current unstable due to aging or electricity reason.At present, the constant current of mancarried device drives and mainly relies on special integrated chip, though easy to use, price wants high with cost other special constant-current drive circuits relatively, complex circuit designs and usage is more single, and autgmentability is less; The drive current of existing constant-current drive circuit controls more difficult simultaneously, and precision is also lower.
Summary of the invention
The technical problem to be solved in the present invention is, control difficulty and the high defect of cost for the complex circuit designs of the constant-current drive circuit of prior art, drive current, provide that a kind of structure is simple, drive current controls convenient and that cost the is low adjustable constant-flow drive circuit being applied to mancarried device.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of constant-current drive circuit, comprises power supply and driven LED, wherein also comprises the control chip for sending pwm control signal according to input signal; For controlling the switching tube of the constant current size of described constant-current drive circuit according to described pwm control signal; And for described constant current being exported the output circuit driving described LED; Described control chip is connected with the control end of described switching tube and described power supply respectively, and the input of described switching tube is connected with described power supply, and the output of described switching tube is connected with described output circuit.
In constant-current drive circuit of the present invention, described constant-current drive circuit also comprises: for carrying out the first filter circuit of filtering process to the output of described power supply; Described first filter circuit is connected with the input of described power supply and described switching tube respectively.
In constant-current drive circuit of the present invention, described constant-current drive circuit also comprises: for carrying out the second filter circuit of filtering process to the supply line of described control chip; Described second filter circuit is connected with described power supply and described control chip respectively.
In constant-current drive circuit of the present invention, described constant-current drive circuit also comprises: for the reference circuit providing reference voltage to described control chip; Described control chip comprises the detection module of the voltage detecting described power supply; Described reference circuit is connected with described control chip.
In constant-current drive circuit of the present invention, described reference circuit comprises the chip TL431 providing 2.5V reference voltage.
In constant-current drive circuit of the present invention, described output circuit is formed in parallel by least two metal-oxide-semiconductors, the control end of each metal-oxide-semiconductor is connected with the output of described switching tube, and the input of described metal-oxide-semiconductor is connected with the negative electrode of described LED, the output head grounding of described metal-oxide-semiconductor.
In constant-current drive circuit of the present invention, described constant-current drive circuit also comprises: the charging circuit charged to described power supply; Described charging circuit is connected with described power supply.
In constant-current drive circuit of the present invention, described control chip is the single-chip microcomputer of model HT66F03C.
In constant-current drive circuit of the present invention, described switching tube is the field effect transistor of model 2301.
The invention still further relates to a kind of constant-current drive circuit, comprise power supply and driven LED, wherein also comprise: for sending the control chip of pwm control signal according to input signal; For controlling the switching tube of the constant current size of described constant-current drive circuit according to described pwm control signal; For described constant current being exported the output circuit driving described LED; For carrying out the first filter circuit of filtering process to the output of described power supply; For carrying out the second filter circuit of filtering process to the supply line of described control chip; For the reference circuit providing reference voltage to described control chip; And give the charging circuit of described power supply charging; Described control chip is connected with the control end of described switching tube and described power supply respectively, and the input of described switching tube is connected with described power supply, and the output of described switching tube is connected with described output circuit; Described first filter circuit is connected with the input of described power supply and described switching tube respectively; Described second filter circuit is connected with described power supply and described control chip respectively; Described reference circuit is connected with described control chip; Described charging circuit is connected with described power supply; Described control chip comprises the detection module of the voltage detecting described power supply; Described reference circuit comprises the chip TL431 providing 2.5V reference voltage; Described output circuit is formed in parallel by least two metal-oxide-semiconductors, and the control end of each metal-oxide-semiconductor is connected with the output of described switching tube, and the input of described metal-oxide-semiconductor is connected with the negative electrode of described LED, the output head grounding of described metal-oxide-semiconductor; Described control chip is the single-chip microcomputer of model HT66F03C; Described switching tube is the field effect transistor of model 2301.
Implement constant-current drive circuit of the present invention, there is following beneficial effect: structure is simple, drive current controls conveniently, cost is low and favorable expandability, overcomes the defect that the complex circuit designs of the existing constant-current drive circuit for mancarried device, drive current control difficulty and cost are high.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the first preferred embodiment of constant-current drive circuit of the present invention;
Fig. 2 is the structural representation of the second preferred embodiment of constant-current drive circuit of the present invention;
Fig. 3 is the structural representation of the 3rd preferred embodiment of constant-current drive circuit of the present invention;
Fig. 4 is the structural representation of the 4th preferred embodiment of constant-current drive circuit of the present invention;
Fig. 5 is the structural representation of the 5th preferred embodiment of constant-current drive circuit of the present invention;
Fig. 6 is the circuit diagram of the preferred embodiment of constant-current drive circuit of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, 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, be not intended to limit the present invention.
In the structural representation of the first preferred embodiment of the constant-current drive circuit of the present invention shown in Fig. 1, described constant-current drive circuit comprises power supply 1, LED2, control chip 3, switching tube 4 and output circuit 5, control chip 3 is for sending pwm control signal according to input signal, switching tube 4 is for controlling the constant current size of described constant-current drive circuit according to described pwm control signal, output circuit 5 drives described LED2 for being exported by described constant current.Control chip 3 is connected with the control end of switching tube 4 and power supply 1 respectively, and the input of switching tube 4 is connected with power supply 1, and the output of switching tube 4 is connected with output circuit 5.As shown in Figure 6, when constant-current drive circuit of the present invention uses, power supply 1 is powered to it by 1 pin of control chip 3, button SW sends input signal to 4 pin of control chip 3,3 pin of control chip 3 can send pwm control signal according to the frequency of input signal, length etc., pwm control signal be input to the control end control switch pipe 4 of switching tube 4 be switched on or switched off with control switch pipe 4 export continuous current size, through switching tube 4 export continuous current driver output circuit 5 after light corresponding LED2.This constant-current drive circuit can control by regulating input signal the brightness that pwm control signal finally regulates LED2.This circuit structure is simple, drive current controls conveniently, cost is low and favorable expandability, overcomes the defect that the complex circuit designs of the existing constant-current drive circuit for mancarried device, drive current control difficulty and cost are high.
In the structural representation of the second preferred embodiment of the constant-current drive circuit of the present invention shown in Fig. 2, described constant-current drive circuit also comprises the first filter circuit 6, first filter circuit 6 is for carrying out filtering process to the output of power supply 1, and the first filter circuit 6 is connected with the input of power supply 1 and switching tube 4 respectively.As shown in Figure 6, the first filter circuit 6 comprises electric capacity CT1, and the anode of electric capacity CT1 is connected with the input of described power supply 1 and described switching tube 4 respectively, the minus earth of electric capacity CT1.First filter circuit 6 filters the ripple voltage that power supply 1 or charging circuit 9 bring because of external disturbance, exports stable voltage.
In the structural representation of the 3rd preferred embodiment of the constant-current drive circuit of the present invention shown in Fig. 3, described constant-current drive circuit also comprises the second filter circuit 7, second filter circuit 7 is for carrying out filtering process to the supply line of control chip 3, and the second filter circuit 7 is connected with power supply 1 and control chip 3 respectively.As shown in Figure 6, the second filter circuit 7 comprises inductance L 1 and electric capacity CT2, and one end of inductance L 1 is connected with power supply 1, and the other end of inductance L 1 is connected with the VDD of control chip 3 and the anode of electric capacity CT2 respectively, the minus earth of electric capacity CT2.Filtering is carried out in the power supply of the second filter circuit 7 pairs of control chips 3, provides stable voltage to control chip 3.
In the structural representation of the 4th preferred embodiment of the constant-current drive circuit of the present invention shown in Fig. 4, described constant-current drive circuit also comprises reference circuit 8, reference circuit 8 provides reference voltage for giving described control chip 3, and control chip 3 comprises the detection module of the voltage detecting described power supply 1; Reference circuit 8 is connected with 2 pin of control chip 3.As shown in Figure 6, described reference circuit 8 comprises the chip TL431 providing 2.5V reference voltage, and detection module is connected to power supply 1 to detect the voltage of power supply 1 by 7 pin of control chip 3.Chip TL431 provides stable 2.5V to 2 pin of control chip 3 using the benchmark as AD memory; make AD memory processes data more accurate; 7 pin of control chip 3 can be made to monitor the voltage of power supply 1 more accurately; make corresponding protection act; during as brownout detected, closing control chip 3 is to stop driving LED 2.
In the structural representation of the 5th preferred embodiment of the constant-current drive circuit of the present invention shown in Fig. 5, described constant-current drive circuit also comprises charging circuit 9; Charging circuit 9 charges for giving power supply 1, and charging circuit 9 is connected with power supply 1.Charging circuit 9 be arranged so that power supply 1 can be reused easily.
As the preferred embodiment of constant-current drive circuit of the present invention, output circuit 5 is formed in parallel by least two metal-oxide-semiconductors, the control end of each metal-oxide-semiconductor is connected with the output of described switching tube 4, and the input of described metal-oxide-semiconductor is connected with the negative electrode of described LED2, the output head grounding of described metal-oxide-semiconductor.Described control chip 3 is the single-chip microcomputer of model HT66F03C.Described switching tube 4 is the field effect transistor of model 2301.As shown in Figure 6, the driving of LED2 is realized by least two (in Fig. 6 being 4) metal-oxide-semiconductor parallel connections, adopt multiple metal-oxide-semiconductor can avoid using the metal-oxide-semiconductor of single large discharge, cost can be effectively reduced, multiple metal-oxide-semiconductor is more conducive to the radiating treatment of circuit simultaneously, is also convenient to the installation of metal-oxide-semiconductor.The single-chip microcomputer of HT66F03C and the field effect transistor of 2301 better can realize the function of this circuit design, and other other chip devices that can realize above-mentioned functions are also in protection scope of the present invention.This constant-current drive circuit simplicity of design, practical function is perfect, and the functions such as the low light level, high light, quick-fried sudden strain of a muscle and voltage protection all can realize.
The invention still further relates to a kind of constant-current drive circuit, comprise power supply 1 and driven LED2, wherein also comprise the control chip 3 for sending pwm control signal according to input signal; For controlling the switching tube 4 of the constant current size of described constant-current drive circuit according to described pwm control signal; For described constant current being exported the output circuit 5 driving described LED2; For carrying out the first filter circuit 6 of filtering process to the output of described power supply 1; For carrying out the second filter circuit 7 of filtering process to the supply line of described control chip 3; For the reference circuit 8 providing reference voltage to described control chip 3; And the charging circuit 9 for charging to described power supply 1; Described control chip 3 is connected with the control end of described switching tube 4 and described power supply 1 respectively, and the input of described switching tube 4 is connected with described power supply 1, and the output of described switching tube 4 is connected with described output circuit 5; Described first filter circuit 6 is connected with the input of described power supply 1 and described switching tube 4 respectively; Described second filter circuit 7 is connected with described power supply 1 and described control chip 3 respectively; Described reference circuit 8 is connected with described control chip 3; Described charging circuit 9 is connected with described power supply 1; Described control chip 3 comprises the detection module of the voltage detecting described power supply 1; Described reference circuit 8 comprises the chip TL431 providing 2.5V reference voltage; Described output circuit 5 is formed in parallel by least two metal-oxide-semiconductors, and the control end of each metal-oxide-semiconductor is connected with the output of described switching tube 4, and the input of described metal-oxide-semiconductor is connected with the negative electrode of described LED2, the output head grounding of described metal-oxide-semiconductor; Described control chip 3 is the single-chip microcomputer of model HT66F03C; Described switching tube 4 is the field effect transistor of model 2301.The embodiment of described constant-current drive circuit of the present invention and the concrete implementation content of beneficial effect and above-mentioned constant-current drive circuit same or similar, specifically refer to above-mentioned concrete implementation content.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing specification of the present invention and accompanying drawing content to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (1)
1. a constant-current drive circuit, comprises power supply (1) and driven LED (2), it is characterized in that, also comprise
For sending the control chip (3) of pwm control signal according to input signal;
For controlling the switching tube (4) of the constant current size of described constant-current drive circuit according to described pwm control signal;
For described constant current being exported the output circuit (5) driving described LED (2);
For carrying out first filter circuit (6) of filtering process to the output of described power supply (1);
For carrying out second filter circuit (7) of filtering process to the supply line of described control chip (3);
Described first filter circuit (6) comprises electric capacity (CT1), described second filter circuit comprises inductance (L1) and electric capacity (CT2), the anode of the electric capacity (CT1) of described first filter circuit (6) respectively with described power supply (1), one end of the inductance (L1) of described second filter circuit (7) and the input of described switching tube (4) connect, the anode of the electric capacity (CT2) of the other end of the inductance (L1) of described second filter circuit (7) and the power supply input pin (VDD) of described control chip (3) and described second filter circuit is connected, the minus earth of the electric capacity (CT2) of described second filter circuit,
For the reference circuit (8) providing reference voltage to described control chip (3); And
For the charging circuit (9) charging to described power supply (1);
Described control chip (3) is connected with the control end of described switching tube (4) and described power supply (1) respectively, the input of described switching tube (4) is connected with described power supply (1), and the output of described switching tube (4) is connected with described output circuit (5); Described first filter circuit (6) is connected with the input of described power supply (1) and described switching tube (4) respectively; Described second filter circuit (7) is connected with described power supply (1) and described control chip (3) respectively; Described reference circuit (8) is connected with described control chip (3); Described charging circuit (9) is connected with described power supply (1);
Described control chip (3) comprises the detection module of the voltage detecting described power supply (1);
Described reference circuit (8) comprises the chip TL431 and electric capacity C5 that provide 2.5V reference voltage, and its chips TL431 and electric capacity C5 is connected in parallel;
Described output circuit (5) is formed in parallel by least two metal-oxide-semiconductors, the control end of each metal-oxide-semiconductor is connected with the output of described switching tube (4), the input of described metal-oxide-semiconductor is connected with the negative electrode of described LED (2), the output head grounding of described metal-oxide-semiconductor;
The single-chip microcomputer that described control chip (3) is model HT66F03C; The field effect transistor that described switching tube (4) is model 2301; Described chip TL431 is connected with second pin (PA6/TP1) of described control chip (3); 7th pin (PA0/AN0/TP0) of described control chip (3) is connected with power supply (1) voltage detecting described power supply (1), and when the brownout of described power supply (1) being detected, close described control chip (3) to stop driving LED (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110071971.1A CN102695320B (en) | 2011-03-24 | 2011-03-24 | Constant-current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110071971.1A CN102695320B (en) | 2011-03-24 | 2011-03-24 | Constant-current drive circuit |
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| Publication Number | Publication Date |
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| CN102695320A CN102695320A (en) | 2012-09-26 |
| CN102695320B true CN102695320B (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110071971.1A Active CN102695320B (en) | 2011-03-24 | 2011-03-24 | Constant-current drive circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103857107A (en) * | 2012-11-30 | 2014-06-11 | 深圳市海洋王照明工程有限公司 | Light fixture and light modulation circuit thereof |
| CN104185332B (en) * | 2013-05-28 | 2016-10-12 | 深圳市海洋王照明工程有限公司 | Head lamp circuit and head lamp |
| CN105978338B (en) * | 2016-06-27 | 2020-09-04 | 湖南正申科技有限公司 | Micropower direct-current low-voltage input direct-current high-voltage generator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008210537A (en) * | 2007-02-23 | 2008-09-11 | Matsushita Electric Works Ltd | Dimmer device, and illumination fixture using it |
| CN101707826A (en) * | 2009-03-19 | 2010-05-12 | 海洋王照明科技股份有限公司 | LED constant current driving circuit |
| CN101720147A (en) * | 2009-07-21 | 2010-06-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
-
2011
- 2011-03-24 CN CN201110071971.1A patent/CN102695320B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008210537A (en) * | 2007-02-23 | 2008-09-11 | Matsushita Electric Works Ltd | Dimmer device, and illumination fixture using it |
| CN101707826A (en) * | 2009-03-19 | 2010-05-12 | 海洋王照明科技股份有限公司 | LED constant current driving circuit |
| CN101720147A (en) * | 2009-07-21 | 2010-06-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
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| CN102695320A (en) | 2012-09-26 |
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