CN102695320A - Constant current drive circuit - Google Patents
Constant current drive circuit Download PDFInfo
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- CN102695320A CN102695320A CN2011100719711A CN201110071971A CN102695320A CN 102695320 A CN102695320 A CN 102695320A CN 2011100719711 A CN2011100719711 A CN 2011100719711A CN 201110071971 A CN201110071971 A CN 201110071971A CN 102695320 A CN102695320 A CN 102695320A
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Abstract
The invention relates to a constant current drive circuit comprising a power supply and a driven LED. Besides, the constant current drive circuit also includes: a control chip, which is used for emitting a PWM control signal according to an input signal; a switching tube, which is used for controlling the constant current of the constant current drive circuit; and an output circuit, which is used for outputting the constant current to drive the LED. The control chip is connected with a control terminal of the switching tube; an input terminal of the switching tube is connected with the power supply; and an output terminal of the switching tube is connected with the output circuit. According to the invention, the constant current drive circuit has advantages of simple structure, convenience for drive current controlling, low cost and good expansibility; and defects that exist in an existing constant current drive circuit for a portable device and include a complex circuit design, difficulty of drive current controlling and high cost can be overcome.
Description
Technical field
The present invention relates to the circuit application field, more particularly, relate to a kind of adjustable constant-flow drive circuit that is applied to mancarried device.
Background technology
Development along with society; Various portable devices (like flashlight) more and more obtain numerous people's use; For the ease of carrying, the power supply of these devices generally adopts the battery of direct current output as power supply, but some battery is owing to aging or electric weight reason cause output current unstable.At present, the constant-current driving of mancarried device mainly relies on special-purpose integrated chip, though easy to use, price wants high with other special constant-current drive circuit costs relatively, and complex circuit designs and usage are more single, and autgmentability is less; The drive current control ratio of existing constant-current drive circuit is difficult simultaneously, and precision is also lower.
Summary of the invention
The technical problem that the present invention will solve is; To complex circuit designs, drive current control difficulty and the defect of high cost of the constant-current drive circuit of prior art, a kind of simple in structure, convenient and low adjustable constant-flow drive circuit that is applied to mancarried device of cost of drive current control is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of constant-current drive circuit, comprise power supply and driven LED, wherein also comprise the control chip that is used for sending according to input signal pwm control signal; Be used for controlling the switching tube of the constant current size of said constant-current drive circuit according to said pwm control signal; And the output circuit that is used for said constant current output is driven said LED; Said control chip is connected with said power supply with said control end of switching tube respectively, and the input of said switching tube is connected with said power supply, and said output end of switching tube is connected with said output circuit.
In constant-current drive circuit of the present invention, said constant-current drive circuit also comprises: first filter circuit that is used for the output of said power supply is carried out Filtering Processing; Said first filter circuit is connected with the input of said power supply and said switching tube respectively.
In constant-current drive circuit of the present invention, said constant-current drive circuit also comprises: second filter circuit that is used for the supply line of said control chip is carried out Filtering Processing; Said second filter circuit is connected with said control chip with said power supply respectively.
In constant-current drive circuit of the present invention, said constant-current drive circuit also comprises: the reference circuit that is used for providing reference voltage to said control chip; Said control chip comprises the detection module of the voltage that detects said power supply; Said reference circuit is connected with said control chip.
In constant-current drive circuit of the present invention, said reference circuit comprises provides the chip of 2.5V reference voltage TL431.
In constant-current drive circuit of the present invention; Said output circuit is formed in parallel by at least two metal-oxide-semiconductors; The control end of each metal-oxide-semiconductor is connected with the output of said switching tube, and the input of said metal-oxide-semiconductor is connected with the negative electrode of said LED, the output head grounding of said metal-oxide-semiconductor.
In constant-current drive circuit of the present invention, said constant-current drive circuit also comprises: the charging circuit of giving said power supply charging; Said charging circuit is connected with said power supply.
In constant-current drive circuit of the present invention, said control chip is the single-chip microcomputer of model HT66F03C.
In constant-current drive circuit of the present invention, said switching tube is the FET 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: the control chip that is used for sending pwm control signal according to input signal; Be used for controlling the switching tube of the constant current size of said constant-current drive circuit according to said pwm control signal; Be used for said constant current output is driven the output circuit of said LED; Be used for the output of said power supply is carried out first filter circuit of Filtering Processing; Be used for the supply line of said control chip is carried out second filter circuit of Filtering Processing; Be used for providing the reference circuit of reference voltage to said control chip; And the charging circuit of giving said power supply charging; Said control chip is connected with said power supply with said control end of switching tube respectively, and the input of said switching tube is connected with said power supply, and said output end of switching tube is connected with said output circuit; Said first filter circuit is connected with the input of said power supply and said switching tube respectively; Said second filter circuit is connected with said control chip with said power supply respectively; Said reference circuit is connected with said control chip; Said charging circuit is connected with said power supply; Said control chip comprises the detection module of the voltage that detects said power supply; Said reference circuit comprises provides the chip of 2.5V reference voltage TL431; Said output circuit is formed in parallel by at least two metal-oxide-semiconductors, and the control end of each metal-oxide-semiconductor is connected with the output of said switching tube, and the input of said metal-oxide-semiconductor is connected with the negative electrode of said LED, the output head grounding of said metal-oxide-semiconductor; Said control chip is the single-chip microcomputer of model HT66F03C; Said switching tube is the FET of model 2301.
The constant-current drive circuit of embodiment of the present invention; Have following beneficial effect: simple in structure, drive current is controlled conveniently, cost is low and favorable expandability, has overcome existing complex circuit designs, drive current control difficulty and the defect of high cost that is used for the constant-current drive circuit of mancarried device.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the structural representation of first preferred embodiment of constant-current drive circuit of the present invention;
Fig. 2 is the structural representation of 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 the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.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.
In the structural representation of first preferred embodiment of constant-current drive circuit of the present invention shown in Figure 1; Said constant-current drive circuit comprises power supply 1, LED2, control chip 3, switching tube 4 and output circuit 5; Control chip 3 is used for sending pwm control signal according to input signal; Switching tube 4 is used for controlling according to said pwm control signal the constant current size of said constant-current drive circuit, and output circuit 5 is used for said constant current output is driven said LED2.Control chip 3 is connected with power supply 1 with the control end of switching tube 4 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 supplied power to it through 1 pin of control chip 3; Button SW sends 4 pin that input signal is given 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 switching tube 4 control end control switch pipe 4 be switched on or switched off continuous current size with 4 outputs of control switch pipe, after the continuous current of switching tube 4 outputs drives output circuit 5, light corresponding LED2.This constant-current drive circuit can be controlled the brightness that pwm control signal is finally regulated LED2 through regulating input signal.This circuit structure is simple, drive current control is convenient, cost is low and favorable expandability, has overcome existing complex circuit designs, drive current control difficulty and the defect of high cost that is used for the constant-current drive circuit of mancarried device.
In the structural representation of second preferred embodiment of constant-current drive circuit of the present invention shown in Figure 2; Said constant-current drive circuit also comprises first filter circuit 6; First filter circuit 6 is used for Filtering Processing is carried out in the output of power supply 1, and first filter circuit 6 is connected with the input of power supply 1 with switching tube 4 respectively.As shown in Figure 6, first filter circuit 6 comprises capacitor C T1, and the anode of capacitor C T1 is connected the minus earth of capacitor C T1 with the input of said power supply 1 and said switching tube 4 respectively.First filter circuit 6 filters the ripple voltage that power supply 1 or charging circuit 9 bring because of external disturbance, exports voltage stably.
In the structural representation of the 3rd preferred embodiment of constant-current drive circuit of the present invention shown in Figure 3; Said constant-current drive circuit also comprises second filter circuit 7; Second filter circuit 7 is used for the supply line of control chip 3 is carried out Filtering Processing, and second filter circuit 7 is connected with control chip 3 with power supply 1 respectively.As shown in Figure 6, second filter circuit 7 comprises inductance L 1 and capacitor C T2, and an end of inductance L 1 is connected with power supply 1, and the other end of inductance L 1 is connected the minus earth of capacitor C T2 with the VDD of control chip 3 and the anode of capacitor C T2 respectively.Filtering is carried out in the power supply of 7 pairs of control chips 3 of second filter circuit, stable voltage is provided for control chip 3.
In the structural representation of the 4th preferred embodiment of constant-current drive circuit of the present invention shown in Figure 4; Said constant-current drive circuit also comprises reference circuit 8; Reference circuit 8 is used for reference voltage to said control chip 3 being provided, and control chip 3 comprises the detection module of the voltage that detects said power supply 1; Reference circuit 8 is connected with 2 pin of control chip 3.As shown in Figure 6, said reference circuit 8 comprises provides the chip of 2.5V reference voltage TL431, and detection module is connected to power supply 1 to detect the voltage of power supply 1 through 7 pin of control chip 3.Chip TL431 provide stable 2.5V to 2 pin of control chip 3 with benchmark as the AD memory; Make AD memory processes data more accurate; Can make 7 pin of control chip 3 monitor the voltage of power supply 1 more accurately; Make corresponding protection action, as when detecting brownout, closing control chip 3 is to stop driving LED 2.
In the structural representation of the 5th preferred embodiment of constant-current drive circuit of the present invention shown in Figure 5, said constant-current drive circuit also comprises charging circuit 9; Charging circuit 9 is used for to power supply 1 charging, and charging circuit 9 is connected with power supply 1.The power supply 1 that is arranged so that of charging circuit 9 can be reused easily.
Preferred embodiment as constant-current drive circuit of the present invention; Output circuit 5 is formed in parallel by at least two metal-oxide-semiconductors; The control end of each metal-oxide-semiconductor is connected with the output of said switching tube 4, and the input of said metal-oxide-semiconductor is connected with the negative electrode of said LED2, the output head grounding of said metal-oxide-semiconductor.Said control chip 3 is the single-chip microcomputer of model HT66F03C.Said switching tube 4 is the FET of model 2301.As shown in Figure 6; Through the driving of at least two (among Fig. 6 being 4) metal-oxide-semiconductor parallel connection realization LED2, adopt a plurality of metal-oxide-semiconductors can avoid the use of the metal-oxide-semiconductor of single big flow, can effectively reduce cost; A plurality of metal-oxide-semiconductors more help the radiating treatment of circuit simultaneously, also are convenient to the installation of metal-oxide-semiconductor.The single-chip microcomputer of HT66F03C and 2301 FET can better be realized 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 realizes perfect in shape and function, and 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 that is used for sending pwm control signal according to input signal; Be used for controlling the switching tube 4 of the constant current size of said constant-current drive circuit according to said pwm control signal; Be used for said constant current output is driven the output circuit 5 of said LED2; Be used for the output of said power supply 1 is carried out first filter circuit 6 of Filtering Processing; Be used for the supply line of said control chip 3 is carried out second filter circuit 7 of Filtering Processing; Be used for providing the reference circuit 8 of reference voltage to said control chip 3; And be used for charging circuit 9 to 1 charging of said power supply; Said control chip 3 is connected with said power supply 1 with the control end of said switching tube 4 respectively, and the input of said switching tube 4 is connected with said power supply 1, and the output of said switching tube 4 is connected with said output circuit 5; Said first filter circuit 6 is connected with the input of said power supply 1 and said switching tube 4 respectively; Said second filter circuit 7 is connected with said control chip 3 with said power supply 1 respectively; Said reference circuit 8 is connected with said control chip 3; Said charging circuit 9 is connected with said power supply 1; Said control chip 3 comprises the detection module of the voltage that detects said power supply 1; Said reference circuit 8 comprises provides the chip of 2.5V reference voltage TL431; Said output circuit 5 is formed in parallel by at least two metal-oxide-semiconductors, and the control end of each metal-oxide-semiconductor is connected with the output of said switching tube 4, and the input of said metal-oxide-semiconductor is connected with the negative electrode of said LED2, the output head grounding of said metal-oxide-semiconductor; Said control chip 3 is the single-chip microcomputer of model HT66F03C; Said switching tube 4 is the FET of model 2301.The practical implementation content of the embodiment of described constant-current drive circuit of the present invention and beneficial effect and above-mentioned constant-current drive circuit is same or similar, specifically sees also above-mentioned practical implementation content.
The above is merely embodiments of the invention; Be not so limit claim of the present invention; Every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to be done, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. a constant-current drive circuit comprises power supply (1) and driven LED (2), it is characterized in that, also comprises
Be used for sending the control chip (3) of pwm control signal according to input signal;
Be used for controlling the switching tube (4) of the constant current size of said constant-current drive circuit according to said pwm control signal; And
Be used for said constant current output is driven the output circuit (5) of said LED (2);
Said control chip (3) is connected with said power supply (1) with the control end of said switching tube (4) respectively, and the input of said switching tube (4) is connected with said power supply (1), and the output of said switching tube (4) is connected with said output circuit (5).
2. constant-current drive circuit according to claim 1 is characterized in that, said constant-current drive circuit also comprises: first filter circuit (6) that is used for the output of said power supply (1) is carried out Filtering Processing; Said first filter circuit (6) is connected with the input of said power supply (1) with said switching tube (4) respectively.
3. constant-current drive circuit according to claim 1 is characterized in that, said constant-current drive circuit also comprises: second filter circuit (7) that is used for the supply line of said control chip (3) is carried out Filtering Processing; Said second filter circuit (7) is connected with said control chip (3) with said power supply (1) respectively.
4. constant-current drive circuit according to claim 1 is characterized in that, said constant-current drive circuit also comprises: the reference circuit (8) that is used for providing reference voltage to said control chip (3); Said control chip (3) comprises the detection module of the voltage that detects said power supply; Said reference circuit (8) is connected with said control chip (3).
5. constant-current drive circuit according to claim 4 is characterized in that, said reference circuit (8) comprises provides the chip of 2.5V reference voltage TL431.
6. constant-current drive circuit according to claim 1; It is characterized in that; Said output circuit (5) is formed in parallel by at least two metal-oxide-semiconductors; The control end of each metal-oxide-semiconductor is connected with the output of said switching tube (4), and the input of said metal-oxide-semiconductor is connected with the negative electrode of said LED (2), the output head grounding of said metal-oxide-semiconductor.
7. constant-current drive circuit according to claim 1 is characterized in that, said constant-current drive circuit also comprises: be used for the charging circuit (9) to said power supply (1) charging; Said charging circuit (9) is connected with said power supply (1).
8. constant-current drive circuit according to claim 1 is characterized in that, said control chip (3) is the single-chip microcomputer of model HT66F03C.
9. constant-current drive circuit according to claim 1 is characterized in that, said switching tube (4) is the FET of model 2301.
10. a constant-current drive circuit comprises power supply (1) and driven LED (2), it is characterized in that, also comprises
Be used for sending the control chip (3) of pwm control signal according to input signal;
Be used for controlling the switching tube (4) of the constant current size of said constant-current drive circuit according to said pwm control signal;
Be used for said constant current output is driven the output circuit (5) of said LED (2);
Be used for the output of said power supply (1) is carried out first filter circuit (6) of Filtering Processing;
Be used for the supply line of said control chip (3) is carried out second filter circuit (7) of Filtering Processing;
Be used for providing the reference circuit (8) of reference voltage to said control chip (3); And
Be used for charging circuit (9) to said power supply (1) charging;
Said control chip (3) is connected with said power supply (1) with the control end of said switching tube (4) respectively, and the input of said switching tube (4) is connected with said power supply (1), and the output of said switching tube (4) is connected with said output circuit (5); Said first filter circuit (6) is connected with the input of said power supply (1) with said switching tube (4) respectively; Said second filter circuit (7) is connected with said control chip (3) with said power supply (1) respectively; Said reference circuit (8) is connected with said control chip (3); Said charging circuit (9) is connected with said power supply (1);
Said control chip (3) comprises the detection module of the voltage that detects said power supply (1);
Said reference circuit (8) comprises provides the chip of 2.5V reference voltage TL431;
Said output circuit (5) is formed in parallel by at least two metal-oxide-semiconductors, and the control end of each metal-oxide-semiconductor is connected with the output of said switching tube (4), and the input of said metal-oxide-semiconductor is connected with the negative electrode of said LED (2), the output head grounding of said metal-oxide-semiconductor;
Said control chip (3) is the single-chip microcomputer of model HT66F03C; Said switching tube (4) is the FET of model 2301.
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 true CN102695320A (en) | 2012-09-26 |
| CN102695320B CN102695320B (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110071971.1A Active CN102695320B (en) | 2011-03-24 | 2011-03-24 | Constant-current drive circuit |
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Cited By (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 |
| CN104185332A (en) * | 2013-05-28 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Head-mounted lamp circuit and head-mounted lamp |
| CN105978338A (en) * | 2016-06-27 | 2016-09-28 | 湖南正申科技有限公司 | Micropower DC low voltage input DC high voltage generator |
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| 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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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 |
Cited By (5)
| 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 |
| CN104185332A (en) * | 2013-05-28 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Head-mounted lamp circuit and head-mounted lamp |
| 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 |
| CN105978338A (en) * | 2016-06-27 | 2016-09-28 | 湖南正申科技有限公司 | Micropower DC low voltage input DC high voltage generator |
| 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 |
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| CN102695320B (en) | 2015-11-11 |
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