CN109392213A - A kind of low-voltage output linear constant current LED driving method - Google Patents
A kind of low-voltage output linear constant current LED driving method Download PDFInfo
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- CN109392213A CN109392213A CN201710675711.2A CN201710675711A CN109392213A CN 109392213 A CN109392213 A CN 109392213A CN 201710675711 A CN201710675711 A CN 201710675711A CN 109392213 A CN109392213 A CN 109392213A
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- voltage
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- constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention relates to a kind of low-voltage output linear constant current LED driving methods, AC-input voltage is accessed from LN line, LED string is input to after full-wave rectifying circuit, voltage is when more than LED string total forward voltage, it is controlled into constant current state, the signal control switching switch that voltage comparator generates, so that the reference voltage of constant-current control module is identical as reference voltage generator, LED string is lighted；Input voltage continues to rise, the signal control switching switch that voltage comparator generates, so that the reference voltage of constant-current control module is no-voltage, so that it is approximately zero that control, which flows through LED current,；After input voltage, which continues to rise, crosses peak point, the signal control switching switch that voltage comparator generates, so that the reference voltage of constant-current control module is identical as reference voltage generator, LED enters constant current state, and LED string is lighted.The inventive structure is simple, high reliablity.
Description
Technical field
The invention belongs to power electronics field more particularly to a kind of low-voltage output linear constant current LED driving methods.
Background technique
In existing LED drive circuit, linear constant current driving circuit has route simple, does not have the advantages of electromagnetic radiation,
Develop a kind of piece-wise linear constant current LED drive circuit out from single hop linear constant current driving circuit, provides a kind of without electrolysis
Capacitor and inductance, high efficiency, the constant current driver circuit for LED of High Power Factor, small size.Component number required for Linear Driving
Amount is few, and product defect rate is lower, and the mode of full patch can be taken to produce.Linear Driving is including that indoor small-power such as ball steeps
Lamp, downlight, ceiling lamp and the outdoor high-power occasion such as Projecting Lamp, bulkhead lamp, street lamp have obtained gradually being widely applied.But
It is that linear constant current has limitation in itself principle, LED needs concatenated total electricity to need to reach the peak value close to input voltage, such as
The concatenated total voltage of fruit is too low, and most pressure drop can lose on the device such as metal-oxide-semiconductor for doing constant current adjustment, and transfer efficiency will
Become unable to receive.Such as the scheme that input voltage is 220V, power is 10W, if needed using single-ended linear current constant mode
LED is connected using the LED of 28 9V, and the actual power of LED is much larger than demand power, causes waste.If using 12 9V
LED series connection, series connection total voltage are 108V, and only less than 50%, most of energy dissipation can draw transfer efficiency on metal-oxide-semiconductor
Metal-oxide-semiconductor is played due to crossing cause thermal damage.
And single led particle is 3V, there are two types of modes for high pressure led particle, first is that it is more to utilize gold thread to connect in encapsulation link
It is a or articulamentum is linked together using the multiple PN junctions of metal on chip in DIE making link.More low power
Using such as the shot-light of 3W, 5W, the area and cost of pcb board does not allow to link together using many LED of quantity.
Summary of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of low-voltage output linear constant current LED drives
Dynamic method, this method had not only been able to satisfy multiple LED operations, but also did not influenced transfer efficiency.
In order to achieve the above-mentioned object of the invention, present invention employs technical solutions below:
A kind of low-voltage output linear constant current LED driving method, using low-voltage output linear constant current LED drive circuit,
The circuit includes full-wave rectifying circuit, LED string, amplitude fading module, voltage comparator, reference voltage generator, control switch
And constant-current control module, AC signal pass through the amplitude fading module being made of resistor network, generation one is same with input voltage
The low voltage signal of step, the low voltage signal access the anode of voltage comparator, and the reference voltage generator accesses voltage ratio
Compared with the negative terminal of device, so that voltage comparator exports high level in thresholding of the input voltage lower than setting, it is higher than in input voltage
Voltage comparator exports low level when the thresholding of setting；
AC-input voltage is accessed from LN line, and LED string is input to after full-wave rectifying circuit, and voltage is gone here and there more than LED
It when total forward voltage, is controlled into constant current state, the signal control switching switch that voltage comparator generates, so that current constant control mould
The reference voltage of block is identical as reference voltage generator, and LED string is lighted；
Input voltage continues to rise, the signal control switching switch that voltage comparator generates, so that constant-current control module
Reference voltage is no-voltage, so that it is approximately zero that control, which flows through LED current,；
After input voltage, which continues to rise, crosses peak point, the signal control switching switch that voltage comparator generates, so that
The reference voltage of constant-current control module is identical as reference voltage generator, and LED enters constant current state, and LED string is lighted.
As excellent alternative: the amplitude fading module includes the resistance R1 being serially connected, resistance R2 and is connected in parallel on electricity
Hinder the capacitor C1 on R2.
The present invention by voltage comparator generate control signal make the reference voltage of constant-current control module no-voltage with
Switch between builtin voltage, the method for realizing low-voltage output linear constant current LED driving, circuit structure used in this method
Simple and reliable property is high, and transfer efficiency is good.
Detailed description of the invention
Fig. 1 is electrical block diagram of the invention.
Fig. 2 is voltage and current waveform of the invention.
Fig. 3 is the electrical block diagram of amplitude fading module of the invention.
Fig. 4 is the electrical block diagram of constant-current control module of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
A kind of low-voltage output linear constant current LED driving method as Figure 1-Figure 4, it is linearly permanent using low-voltage output
LED driving circuit is flowed, which includes full-wave rectifying circuit, LED string, amplitude fading module, voltage comparator, reference voltage
Generator, control switch and constant-current control module, the amplitude fading module include the resistance R1 being serially connected, resistance R2 and
The capacitor C1 being connected in parallel on resistance R2.AC signal passes through the amplitude fading module that is made of resistor network, generate one with it is defeated
Enter the low voltage signal of voltage synchronous, which accesses the anode of voltage comparator, and the reference voltage generator connects
Enter the negative terminal of voltage comparator, so that voltage comparator exports high level in thresholding of the input voltage lower than setting, is inputting
Voltage comparator exports low level when voltage is higher than the thresholding of setting；
AC-input voltage is accessed from LN line, and LED string is input to after full-wave rectifying circuit, and voltage is gone here and there more than LED
It when total forward voltage, is controlled into constant current state, the signal control switching switch that voltage comparator generates, so that current constant control mould
The reference voltage of block is identical as reference voltage generator, and LED string is lighted；
Input voltage continues to rise, the signal control switching switch that voltage comparator generates, so that constant-current control module
Reference voltage is no-voltage, so that it is approximately zero that control, which flows through LED current,；
After input voltage, which continues to rise, crosses peak point, the signal control switching switch that voltage comparator generates, so that
The reference voltage of constant-current control module is identical as reference voltage generator, and LED enters constant current state, and LED string is lighted.
AC-input voltage is accessed from LN line, is become the input voltage waveform in Fig. 2 by full-wave rectification, is input to LED
String, for connecting here using 12 9V 1W LED, electric current is in forward voltage 108V total more than LED, into constant current shape
The characteristic of flat-top is presented in state control, led current waveform as shown in Figure 2.
AC signal passes through the amplitude fading module being made of resistor network, generates a low electricity synchronous with input voltage
Press signal.Control chip interior has reference voltage generator circuit, its purpose is one constant reference voltage of generation, such as
It 0.5 volt, is used for constant-current control module as benchmark.And the voltage comparator that this constant reference voltage can also input,
It is compared with the input voltage after decaying.
The input voltage that voltage comparator can be set to after decaying connects anode, and reference voltage connects negative terminal, thus inputting
When voltage is lower than the thresholding set, high level is exported.Low level is exported when input voltage is higher than the thresholding of setting.
The thresholding of setting can determine by adjusting resistance ratio in amplitude fading module, as shown in figure 3, R1 and
R2 forms potential-divider network, and the effect of C1 is to filter out the noise in line voltage.
For the control Signal-controlled switch that voltage comparator generates before input voltage reaches A point, control switch connects reference
The output voltage and constant-current control module of voltage generator, the benchmark of constant-current control module are internal reference voltage, AB point it
Between, control switch connects ground and constant-current control module, and the benchmark of constant-current control module is no-voltage.
To produce current waveform as shown in Figure 2, when input voltage is greater than C point, C point here is LED string
Total input voltage, the electric current for flowing through LED enter current constant control state, and LED is lighted；Input voltage continues to rise when reaching A point, permanent
The benchmark of flow control module is switched to no-voltage, so that it is approximately zero that control, which flows through LED current,；It is got over when input voltage continues to rise
After crossing peak point arrival b point, the reference voltage of constant-current control module is switched to internal reference voltage, and LED enters constant current state,
LED is lighted.Constant-current control module shown in Fig. 4, the electric current for flowing through load is I=Vref/R3, controls electric current and reference voltage at just
Than the electric current for flowing through load can be controlled by changing reference voltage.
It should be pointed out that above embodiments are only representative examples of the invention.The present invention can also there are many deformations.It is all
Any simple modification, equivalent change and modification to the above embodiments of essence according to the present invention are considered as belonging to this
The protection scope of invention.
Claims (2)
1. a kind of low-voltage output linear constant current LED driving method, it is characterised in that:
Using low-voltage output linear constant current LED drive circuit, which includes full-wave rectifying circuit, LED string, amplitude fading mould
Block, voltage comparator, reference voltage generator, control switch and constant-current control module, AC signal pass through by resistor network group
At amplitude fading module, generate a low voltage signal synchronous with input voltage, the low voltage signal access voltage compare
The anode of device, the negative terminal of the reference voltage generator access voltage comparator, thus in thresholding of the input voltage lower than setting
When, voltage comparator exports high level, and when input voltage is higher than the thresholding of setting, voltage comparator exports low level；
AC-input voltage is accessed from LN line, LED string is input to after full-wave rectifying circuit, voltage is total just more than LED string
It when to voltage, is controlled into constant current state, the signal control switching switch that voltage comparator generates, so that constant-current control module
Reference voltage is identical as reference voltage generator, and LED string is lighted；
Input voltage continues to rise, the signal control switching switch that voltage comparator generates, so that the reference of constant-current control module
Voltage is no-voltage, so that it is approximately zero that control, which flows through LED current,；
After input voltage, which continues to rise, crosses peak point, the signal control switching switch that voltage comparator generates, so that constant current
The reference voltage of control module is identical as reference voltage generator, and LED enters constant current state, and LED string is lighted.
2. a kind of low-voltage output linear constant current LED driving method according to claim 1, it is characterised in that:
The amplitude fading module includes the resistance R1 being serially connected, resistance R2 and the capacitor C1 that is connected in parallel on resistance R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710675711.2A CN109392213A (en) | 2017-08-09 | 2017-08-09 | A kind of low-voltage output linear constant current LED driving method |
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| CN201710675711.2A CN109392213A (en) | 2017-08-09 | 2017-08-09 | A kind of low-voltage output linear constant current LED driving method |
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| CN109392213A true CN109392213A (en) | 2019-02-26 |
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| CN201710675711.2A Pending CN109392213A (en) | 2017-08-09 | 2017-08-09 | A kind of low-voltage output linear constant current LED driving method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110324935A (en) * | 2019-06-19 | 2019-10-11 | 杰华特微电子（张家港）有限公司 | A kind of efficient linear LED drive circuit and method |
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| CN103108470A (en) * | 2013-02-06 | 2013-05-15 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103188848A (en) * | 2011-12-30 | 2013-07-03 | 王钦恒 | Segmented linear constant current light emitting diode (LED) driving circuit |
| CN103491682A (en) * | 2013-09-22 | 2014-01-01 | 辉芒微电子（深圳）有限公司 | Linear switching constant-current LED drive circuit for control over peak current |
| CN104902609A (en) * | 2014-03-04 | 2015-09-09 | 上海酷蓝电子科技有限公司 | Segmented linear constant current drive circuit constant power control circuit |
| CN106507542A (en) * | 2016-12-21 | 2017-03-15 | 贵州恒芯微电子科技有限公司 | The linear constant current LED drive controls method of invariable power and circuit structure |
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2017
- 2017-08-09 CN CN201710675711.2A patent/CN109392213A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202475829U (en) * | 2011-12-21 | 2012-10-03 | 王钦恒 | Reference voltage generating circuit |
| CN103188848A (en) * | 2011-12-30 | 2013-07-03 | 王钦恒 | Segmented linear constant current light emitting diode (LED) driving circuit |
| CN103108470A (en) * | 2013-02-06 | 2013-05-15 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103491682A (en) * | 2013-09-22 | 2014-01-01 | 辉芒微电子（深圳）有限公司 | Linear switching constant-current LED drive circuit for control over peak current |
| CN104902609A (en) * | 2014-03-04 | 2015-09-09 | 上海酷蓝电子科技有限公司 | Segmented linear constant current drive circuit constant power control circuit |
| CN106507542A (en) * | 2016-12-21 | 2017-03-15 | 贵州恒芯微电子科技有限公司 | The linear constant current LED drive controls method of invariable power and circuit structure |
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| CN110324935A (en) * | 2019-06-19 | 2019-10-11 | 杰华特微电子（张家港）有限公司 | A kind of efficient linear LED drive circuit and method |
| CN110324935B (en) * | 2019-06-19 | 2024-05-24 | 杰华特微电子（张家港）有限公司 | Efficient linear LED driving circuit and method |
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Application publication date: 20190226 |