CN102076152A - Power-adjustable LED constant current source - Google Patents
Power-adjustable LED constant current source Download PDFInfo
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- CN102076152A CN102076152A CN2011100247585A CN201110024758A CN102076152A CN 102076152 A CN102076152 A CN 102076152A CN 2011100247585 A CN2011100247585 A CN 2011100247585A CN 201110024758 A CN201110024758 A CN 201110024758A CN 102076152 A CN102076152 A CN 102076152A
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Abstract
The invention discloses a power-adjustable light emitting diode (LED) constant current source. The constant current source comprises an electro-magnetic interference (EMI) filter circuit, a bridge type rectifying and filtering circuit, a power factor correction (PFC) circuit, a pulse width modulation (PWM) control circuit, a switch tube, a transformer, an optical coupler, an L6562 chip, a TEA1552 chip, a rectifying and filtering circuit, a sampling circuit, a comparing and amplifying circuit, a potentiometer and an M1013 chip. The power-adjustable LED constant current source disclosed by the invention has higher overall efficiency which can reach over 90 percent; the constant current source is provided with multiple protection circuits, so under-voltage protection, over-voltage protection, over-current protection, over-power protection and over-heating protection are realized; and output power can be conveniently adjusted, so a user can set the output power according to own needs.
Description
Technical field
The present invention relates to a kind of constant-current source, particularly relate to a kind of power-adjustable LED constant-current source that drives high-power LED light source.
Background technology
High-power LED light source is as a kind of novel energy-saving light source, because of its luminous efficiency height, performance such as color rendering is good, the life-span is long, becomes strong competitor in the illumination market just gradually.High-power LED light source need with the supporting use of the power supply with premium properties, just can give full play to its performance advantage.Because the overall efficiency of light fixture not only depends on led light source itself, also relevant with driving power, because the power consumption of driving power is too big the efficient of overall system is greatly reduced if having the led light source of greater efficiency, just run counter to the aim of efficient energy-saving.It is best at present led light source type of drive that constant-current source drives.The employing constant-current source drives, and the electric current that flows through on the led light source will not be subjected to change in voltage, variation of ambient temperature, and the influence of LED self parameter variation, thereby the energy holding current is constant, gives full play to the various good characteristics of led light source.And existing constant-current source exists volume big, the circuit complexity, and power consumption is big, and efficient is low, stability and shortcoming such as reliability is all relatively poor.
In sum, problem demanding prompt solution is that existing LED constant-current source can not well satisfy the needs that drive high-power LED light source, needs a kind of low-power consumption, high efficiency, can regulate power output, and reliable and stable LED constant-current source.
Summary of the invention
Technical problem to be solved by this invention is, a kind of low-power consumption, high efficiency are provided, and can regulate power output, and reliable and stable LED constant-current source.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of power-adjustable LED constant-current source, and this constant-current source comprises: EMI filter circuit, bridge rectifier and filter circuit, pfc circuit, pwm control circuit, switching tube, transformer, optical coupler, pfc circuit control chip, pwm control circuit control chip, current rectifying and wave filtering circuit, sample circuit, comparison amplifying circuit, potentiometer and comparison amplifying circuit control chip; Wherein, described EMI filter circuit, bridge rectifier and filter circuit are connected successively with pfc circuit; Described pwm control circuit, switching tube, transformer, current rectifying and wave filtering circuit, sample circuit, comparison amplifying circuit, optical coupler, pwm control circuit connect successively; Described potentiometer is connected with the comparison amplifying circuit; Described pfc circuit control chip is the control chip of described pfc circuit, and described pwm control circuit control chip is the control chip of described pwm control circuit, and described relatively amplifying circuit control chip is the described relatively control chip of amplifying circuit; Described current rectifying and wave filtering circuit is connected with led light source.
In the described power-adjustable LED constant-current source, described pfc circuit control chip is the L6562 chip.
In the described power-adjustable LED constant-current source, described pwm control circuit control chip is the TEA1552 chip.
In the described power-adjustable LED constant-current source, described relatively amplifying circuit control chip is the M1013 chip.
In the described power-adjustable LED constant-current source, 1 pin of described L6562 chip is connected with described pwm control circuit by resistance, and 3 pin of described L6562 chip are connected with described bridge rectifier and filter circuit by resistance.
In the described power-adjustable LED constant-current source, 8 pin of described TEA1552 chip are connected with described optical coupler with described pfc circuit respectively with 9 pin, 7 pin of described TEA1552 chip are connected with described transformer, 4 pin of described TEA1552 chip are connected with described switching tube by resistance, and 13 pin of described TEA1552 chip are connected with described optical coupler.
In the described power-adjustable LED constant-current source, 3 pin of described M1013 chip are connected with described potentiometer, and 4 pin of described M1013 chip are connected with described sample circuit, and 8 pin of described M1013 chip are connected with described optical coupler.
Advantage of the present invention is, the reasonable combination of the present invention by EMI filter circuit, bridge rectifier and filter circuit, pfc circuit, pwm control circuit, switching tube, transformer, optical coupler, pfc circuit control chip, pwm control circuit control chip, current rectifying and wave filtering circuit, sample circuit, comparison amplifying circuit, potentiometer and comparison amplifying circuit control chip makes that the present invention has the following advantages 1, overall efficiency is higher, can reach more than 90%; 2, have multiple protective circuit, have under-voltage protection, overvoltage protection, overcurrent protection, overpower protection and overtemperature protection; 3, it can regulate power output easily, and the user can be provided with power output according to the needs of oneself.
Description of drawings
Fig. 1 is the circuit function block diagram of power-adjustable LED constant-current source of the present invention;
Fig. 2 is the circuit theory diagrams of power-adjustable LED constant-current source of the present invention;
Fig. 3 is the circuit theory diagrams of power-adjustable LED constant-current source of the present invention.
Embodiment
For further disclosing technical scheme of the present invention, be described with reference to the accompanying drawings embodiments of the present invention now.
Fig. 1 is the circuit function block diagram of power-adjustable LED constant-current source of the present invention, Fig. 2 is the circuit theory diagrams of power-adjustable LED constant-current source of the present invention, Fig. 3 is the circuit theory diagrams of power-adjustable LED constant-current source of the present invention, wherein, comprising: EMI filter circuit 101, bridge rectifier and filter circuit 102, pfc circuit 103, pwm control circuit 104, switching tube 105, transformer 106, optical coupler 107, L6562 chip 108, TEA1552 chip 109, current rectifying and wave filtering circuit 110, sample circuit 112, comparison amplifying circuit 113, potentiometer 114 and M1013 chip 115; Wherein, described EMI filter circuit 101, bridge rectifier and filter circuit 102 are connected successively with pfc circuit 103; Described pwm control circuit 104, switching tube 105, transformer 106, current rectifying and wave filtering circuit 110, sample circuit 112, comparison amplifying circuit 113, optical coupler 107, pwm control circuit 104 connect successively; Described potentiometer 114 is connected with comparison amplifying circuit 113; Described L6562 chip 108 is the control chip of described pfc circuit 103, and described TEA1552 chip 109 is the control chip of described pwm control circuit 104, and described M1013 chip 115 is the described relatively control chip of amplifying circuit 113; Described current rectifying and wave filtering circuit 110 is connected with led light source 111.
As shown in Figures 2 and 3, among the present invention, described pfc circuit 103 is made up of described L6562 chip 108 and peripheral circuit thereof, described pwm control circuit 104 is made up of described TEA1552 chip 109 and peripheral circuit thereof, and described relatively amplifying circuit 113 is made up of described M1013 chip 115 and peripheral circuit thereof.In addition, the E end that is marked among the E that marked among Fig. 2 end and Fig. 3 is communicated with, the F that is marked among Fig. 2 hold with Fig. 3 in the F that marked hold and be communicated with.
Further, 1 pin of described L6562 chip 108 is connected with described pwm control circuit 104 by resistance, and 3 pin of described L6562 chip 108 are connected with described bridge rectifier and filter circuit 102 by resistance; 8 pin of described TEA1552 chip 109 are connected with described optical coupler 107 with described pfc circuit 103 respectively with 9 pin, 7 pin of described TEA1552 chip 109 are connected with described transformer 106,4 pin of described TEA1552 chip 109 are connected with described switching tube 105 by resistance, and 13 pin of described TEA1552 chip 109 are connected with described optical coupler 107; 3 pin of described M1013 chip 115 are connected with described potentiometer 114, and 4 pin of described M1013 chip 115 are connected with described sample circuit 112, and 8 pin of described M1013 chip 115 are connected with described optical coupler 107.
Action situation when illustrating that below in conjunction with Fig. 1, Fig. 2 and Fig. 3 the present invention works, but the present invention is not limited to this kind action situation.
In the real work, power-adjustable LED constant-current source of the present invention and described led light source 111 are installed in the light fixture, after feeding civil power, enter the direct current of described bridge rectifier and filter circuit 102 and output ripple after the interference signal of alternating current in described EMI filter circuit 101 filtering electrical networks, it is DC400V as control chip with the voltage transformation of input range in AC85V-265V that described pfc circuit 103 adopts described L6562 chip 108, described transformer 106 is transformed to DC36V with the output voltage of described pfc circuit 103, power output is about 110W, after the operating current signal of the described led light source 111 that described sample circuit 112 will collect and operating voltage signal pass through described relatively amplifying circuit 113, through described optical coupler 107 feedback signal is coupled to described pwm control circuit 104, described pwm control circuit control chip 109 is that the conduction and cut-off time scale of the described switching tube 105 of described TEA1552 chip 109 controls is constant with the voltage and current that assurance outputs to described led light source 111.
In addition, regulate the reference voltage that is input to described pwm control circuit 104 by the described potentiometer 114 of regulating described relatively amplifying circuit 113, regulate the duty ratio of described pwm control circuit 104 output pulse signals with this, this pulse signal is input to the grid of described switching tube 105, the break-make of control switch pipe, constant with dynamic holding power, make the user power output to be set according to the needs of oneself.
(85V～when 265V) working, can guarantee the firm power output of power supply, and the maintenance of the electric current of the described led light source 111 of flowing through is constant realizes that the safe voltage of isolation is fully exported to the input voltage of power-adjustable LED constant-current source of the present invention in very wide scope.
More than, the basic ideas and basic principles of the present invention have been set forth by description of listed embodiment.But the present invention never is limited to above-mentioned listed execution mode, and every equivalent variations, improvement and deliberately of inferior quality behavior of doing based on technical scheme of the present invention of change all should belong to protection scope of the present invention.
Claims (7)
1. power-adjustable LED constant-current source, it is characterized in that this constant-current source comprises: EMI filter circuit (101), bridge rectifier and filter circuit (102), pfc circuit (103), pwm control circuit (104), switching tube (105), transformer (106), optical coupler (107), pfc circuit control chip (108), pwm control circuit control chip (109), current rectifying and wave filtering circuit (110), sample circuit (112), comparison amplifying circuit (113), potentiometer (114) and comparison amplifying circuit control chip (115); Wherein, described EMI filter circuit (101), bridge rectifier and filter circuit (102) are connected successively with pfc circuit (103); Described pwm control circuit (104), switching tube (105), transformer (106), current rectifying and wave filtering circuit (110), sample circuit (112), comparison amplifying circuit (113), optical coupler (107), pwm control circuit (104) connect successively; Described potentiometer (114) is connected with comparison amplifying circuit (113); Described pfc circuit control chip (108) is the control chip of described pfc circuit (103), described pwm control circuit control chip (109) is the control chip of described pwm control circuit (104), and described relatively amplifying circuit control chip (115) is the described relatively control chip of amplifying circuit (113); Described current rectifying and wave filtering circuit (110) is connected with led light source (111).
2. power-adjustable LED constant-current source according to claim 1 is characterized in that described pfc circuit control chip (108) is the L6562 chip.
3. power-adjustable LED constant-current source according to claim 1 is characterized in that described pwm control circuit control chip (109) is the TEA1552 chip.
4. power-adjustable LED constant-current source according to claim 1 is characterized in that, described relatively amplifying circuit control chip (115) is the M1013 chip.
5. power-adjustable LED constant-current source according to claim 2, it is characterized in that, 1 pin of described L6562 chip (108) is connected with described pwm control circuit (104) by resistance, and 3 pin of described L6562 chip (108) are connected with described bridge rectifier and filter circuit (102) by resistance.
6. power-adjustable LED constant-current source according to claim 3, it is characterized in that, 8 pin of described TEA1552 chip (109) are connected with described optical coupler (107) with described pfc circuit (103) respectively with 9 pin, 7 pin of described TEA1552 chip (109) are connected with described transformer (106), 4 pin of described TEA1552 chip (109) are connected with described switching tube (105) by resistance, and 13 pin of described TEA1552 chip (109) are connected with described optical coupler (107).
7. power-adjustable LED constant-current source according to claim 4, it is characterized in that, 3 pin of described M1013 chip (115) are connected with described potentiometer (114), 4 pin of described M1013 chip (115) are connected with described sample circuit (112), and 8 pin of described M1013 chip (115) are connected with described optical coupler (107).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100247585A CN102076152A (en) | 2011-01-21 | 2011-01-21 | Power-adjustable LED constant current source |
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| CN2011100247585A CN102076152A (en) | 2011-01-21 | 2011-01-21 | Power-adjustable LED constant current source |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438376A (en) * | 2011-12-20 | 2012-05-02 | 成都成电硅海科技股份有限公司 | LED (Light Emitting Diode) constant-current driving power circuit |
| CN103052196A (en) * | 2011-10-11 | 2013-04-17 | 荃宝科技股份有限公司 | Constant current driving device with voltage clamping characteristic load |
| WO2013177757A1 (en) * | 2012-05-30 | 2013-12-05 | Zou Gaodi | Led light adjustment driver and led light source system |
| CN104470160A (en) * | 2015-01-06 | 2015-03-25 | 宁波江北华瑞电子有限公司 | Self-adaption efficient LED driving power supply |
| CN106020307A (en) * | 2016-06-23 | 2016-10-12 | 电子科技大学 | Linear constant-current power supply with constant power consumption |
| WO2020077954A1 (en) * | 2018-10-15 | 2020-04-23 | 深圳市崧盛电子股份有限公司 | Led power supply and redundant led power supply |
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| CN201018411Y (en) * | 2007-02-02 | 2008-02-06 | 深圳市东辰科技有限公司 | Power supply chip function extending circuit of switch power source |
| CN201114945Y (en) * | 2007-09-30 | 2008-09-10 | 石守东 | Electronic ballast for high-voltage discharging lamp |
| CN101636022A (en) * | 2009-07-23 | 2010-01-27 | 刘让斌 | Power supply controller of high-efficiency energy-saving LED lamp |
| CN101834539A (en) * | 2010-05-27 | 2010-09-15 | 浙江大学 | High-efficiency AC/DC combined converter with wide output voltage range |
| CN201585174U (en) * | 2009-12-18 | 2010-09-15 | 深圳市福瑞康电子有限公司 | Led drive circuit |
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2011
- 2011-01-21 CN CN2011100247585A patent/CN102076152A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201018411Y (en) * | 2007-02-02 | 2008-02-06 | 深圳市东辰科技有限公司 | Power supply chip function extending circuit of switch power source |
| CN201114945Y (en) * | 2007-09-30 | 2008-09-10 | 石守东 | Electronic ballast for high-voltage discharging lamp |
| CN101636022A (en) * | 2009-07-23 | 2010-01-27 | 刘让斌 | Power supply controller of high-efficiency energy-saving LED lamp |
| CN201585174U (en) * | 2009-12-18 | 2010-09-15 | 深圳市福瑞康电子有限公司 | Led drive circuit |
| CN101834539A (en) * | 2010-05-27 | 2010-09-15 | 浙江大学 | High-efficiency AC/DC combined converter with wide output voltage range |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103052196A (en) * | 2011-10-11 | 2013-04-17 | 荃宝科技股份有限公司 | Constant current driving device with voltage clamping characteristic load |
| CN102438376A (en) * | 2011-12-20 | 2012-05-02 | 成都成电硅海科技股份有限公司 | LED (Light Emitting Diode) constant-current driving power circuit |
| WO2013177757A1 (en) * | 2012-05-30 | 2013-12-05 | Zou Gaodi | Led light adjustment driver and led light source system |
| CN104470160A (en) * | 2015-01-06 | 2015-03-25 | 宁波江北华瑞电子有限公司 | Self-adaption efficient LED driving power supply |
| CN106020307A (en) * | 2016-06-23 | 2016-10-12 | 电子科技大学 | Linear constant-current power supply with constant power consumption |
| WO2020077954A1 (en) * | 2018-10-15 | 2020-04-23 | 深圳市崧盛电子股份有限公司 | Led power supply and redundant led power supply |
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Application publication date: 20110525 |