CN103458551A - Switch LED drive circuit and LED lighting system - Google Patents
Switch LED drive circuit and LED lighting system Download PDFInfo
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- CN103458551A CN103458551A CN2012101706412A CN201210170641A CN103458551A CN 103458551 A CN103458551 A CN 103458551A CN 2012101706412 A CN2012101706412 A CN 2012101706412A CN 201210170641 A CN201210170641 A CN 201210170641A CN 103458551 A CN103458551 A CN 103458551A
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- input voltage
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a switch LED drive circuit and an LED lighting system. The LED drive circuit comprises a voltage sampling circuit, a switch combination and a switching control circuit. The voltage sampling circuit samples input voltage to obtain sampled voltage reflecting the input voltage. The switch combination includes a plurality of switches, each switch corresponds to one or multiple LEDs in series connection, and when one switch is connected or disconnected, the LED corresponding to the switch is driven by the input voltage. The switching control circuit determines connection and disconnection of each switch of the switch combination according to the sampled voltage. Number of the LEDs can be adjusted and driven by changes of the input voltage, so that energy-storage elements such as a capacitor or an inductor are omitted. In addition, output current can be allowed to keep tracks of waveform change trajectories of the input voltage, so that the output current and the input voltage can be kept in the same phase to obtain high power factors.
Description
[technical field]
The present invention relates to circuit design field, especially switch LED (light emitting diode is called for short LED) drive circuit and LED illuminator.
[background technology]
LED is more and more extensive in the application of lighting field.In LED illumination application, LED drive circuit directly has influence on the life and reliability of LED light fixture.Drive circuit commonly used includes the constant current LED drive circuit of Switching Power Supply structure at present, and its efficiency is higher, can reach more than 90%.Yet the constant current LED drive circuit of this Switching Power Supply structure has power factor (Power factor) low, high-frequency electromagnetic disturbs (EMI) large, need to use the shortcomings such as energy-storage travelling wave tube such as larger electric capacity, inductance.
Therefore, be necessary to propose a kind of improved LED drive circuit and illuminator and overcome above-mentioned shortcoming.
[summary of the invention]
One of the technical problem to be solved in the present invention is to provide a kind of LED drive circuit, and it can not need the energy-storage travelling wave tubes such as electric capacity or inductance or only need the energy-storage travelling wave tubes such as less electric capacity or inductance, and can have higher power factor.
Two of the technical problem to be solved in the present invention is to provide a kind of LED illuminator with LED drive circuit, described LED drive circuit can not need the energy-storage travelling wave tubes such as electric capacity or inductance or only need the energy-storage travelling wave tubes such as less electric capacity or inductance, and can have higher power factor.
In order to address the above problem, according to an aspect of the present invention, the invention provides a kind of LED drive circuit, it comprises: voltage sampling circuit, the sampling input voltage obtains reflecting the sampled voltage of described input voltage; Switch combination, comprise several switches, the LED of the corresponding one or more series connection of each switch, and when a switch conduction or shutoff, the LED that this switch is corresponding is driven by described input voltage; ON-OFF control circuit, determine conducting and the disconnection of each switch in described switch combination according to described sampled voltage.
Further, each switch and corresponding LED parallel connection, all LED connect mutually, when a switch turn-offs, the LED that the switch of this shutoff is corresponding is driven by described input voltage, and when a switch conduction, the LED that the switch of this conducting is corresponding is not driven by described input voltage.
Further, the number of the LED corresponding with each switch is 2
x, X is more than or equal to 0 integer, the different X value that each switch is corresponding, and the X value that each switch is corresponding is adjacent.
Further, described ON-OFF control circuit obtains the number of the LED of the current required driving of input voltage according to the value of sampled voltage, and control conducting and the disconnection of each switch according to the number of the LED of the current required driving of input voltage, so that the wave form varies track of the Current Tracing input voltage flow through on the LED driven.
Further, described ON-OFF control circuit comprises analog to digital converter and control circuit, described analog to digital converter converts the value of described sampled voltage to digital signal, store the corresponding relation of number of the LED of input voltage and its required driving in described control circuit, the number that described control circuit is determined the LED of the current required driving of input voltage according to currency and the described corresponding relation of digital sampled voltage, and control conducting and the disconnection of each switch according to the number of the LED of the current required driving of input voltage.
According to an aspect of the present invention, the invention provides a kind of LED illuminator, it includes several LED and LED drive circuit.Described LED drive circuit comprises: voltage sampling circuit, and the sampling input voltage obtains reflecting the sampled voltage of described input voltage; Switch combination, comprise several switches, the LED of the corresponding one or more series connection of each switch, and when a switch conduction or shutoff, the LED that this switch is corresponding is driven by described input voltage; ON-OFF control circuit, determine conducting and the disconnection of each switch in described switch combination according to described sampled voltage.
Compared with prior art, adjust in the present invention the number of the LED of driving according to the variation of input voltage, thereby can not need to arrange the energy-storage travelling wave tubes such as electric capacity or inductance, or only need the energy-storage travelling wave tubes such as less electric capacity or inductance.In addition, also can be so that output current (flowing through the electric current of driven LED) be followed the trail of the wave form varies track of input voltage, thus make output current and input voltage keep same-phase, obtain higher power factor.
About other purposes of the present invention, feature and advantage, describe in detail in embodiment below in conjunction with accompanying drawing.
[accompanying drawing explanation]
In conjunction with reference to accompanying drawing and ensuing detailed description, the present invention will be easier to understand, structure member corresponding to same Reference numeral wherein, wherein:
Fig. 1 is the LED drive circuit circuit diagram in one embodiment in the present invention;
Fig. 2 is the LED drive circuit circuit diagram in another embodiment in the present invention.
[embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Alleged " embodiment " or " embodiment " refer to that special characteristic, structure or the characteristic relevant to described embodiment at least can be contained at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur also nonessentially all refer to same embodiment, must not be yet with other embodiment mutually exclusive separately or select embodiment.The word that the expressions such as " connection " in the present invention, " connecing ", " joining " are electrically connected all means direct or indirect electric connection, and " some " and " a plurality of " all mean two or more.
The present invention proposes a kind of switch LED drive circuit, it can adjust according to the variation of input voltage the number of the LED of driving, thereby can be in the situation that do not need to arrange the energy-storage travelling wave tubes such as electric capacity or inductance, make the electric current (also can be described as output current) flow through on LED can follow the trail of the wave form varies track of input voltage, thereby can make output current and input voltage keep same-phase, obtain higher power factor.
Fig. 1 is the LED drive circuit circuit diagram in one embodiment in the present invention.Described LED drive circuit comprises voltage sampling circuit 110, ON-OFF control circuit 120 and switch combination 130.
Described LED drive circuit can drive several LED, and described LED can form a LED load array, and input voltage vin connects an end of described LED load array.
The described input voltage vin of voltage sampling circuit 110 sampling obtains reflecting the sampled voltage V of described input voltage vin
d.In one embodiment, described bleeder circuit 110 comprises that being connected on the voltage that between input voltage vin and ground, the intermediate node of resistance R 1 and 2, two resistance of resistance R provides is described sampled voltage V
d.
Described switch combination 130 comprises n switch S 1, S2, Sn-1 and Sn, each switch and one or more LED parallel connections of connecting.In one embodiment, as the LED of load, mutually connect, totally 2
n-1, they are connected between input voltage vin and resistance R 3, the other end ground connection of resistance R 3, and switch S 1 is in parallel with 1 LED (LED1 in diagram), switch S 2 and 2 LED that connect (LED2 in diagram, LED3) parallel connection, switch S n-1 and 2
n-2the LED of the individual series connection (LED2 in diagram
n-2, LED2
n-1-1) parallel connection, switch S n and 2
n-1the LED of the individual series connection (LED2 in diagram
n-1, LED2
n-1) parallel connection, the LED that each switch is corresponding can be called as one group.Wherein n is more than or equal to 1 natural number.When a switch conduction, with the LED of this switch in parallel, owing to being extinguished by short circuit, when a switch disconnects, with the LED of this switch in parallel, be used as the LED of driving and light.
Described ON-OFF control circuit 120 is according to sampled voltage V
dvalue determine conducting and the disconnection of each switch in described switch combination 130, so that the electric current flow through on driven LED can be followed the trail of the wave form varies track of input voltage, and then can, so that output current and input voltage keep same-phase, obtain higher power factor.Described input voltage vin is generally the voltage of cyclic fluctuation, such as from 0V to
the voltage that the frequency of (about 310V) is 100HZ.Due to described sampled voltage V
dthe size that reflects described input voltage vin, according to sampled voltage V
dinstantaneous value just can obtain the instantaneous value of described input voltage vin.In one embodiment, the corresponding relation of number of the LED of input voltage vin and its required driving can be set on ON-OFF control circuit 120, be all how many LED of demand motive of each input voltage vin value, and, according to above-mentioned corresponding relation driving LED the time, the electric current flow through on driven LED can be followed the trail of the wave form varies track of input voltage.Above-mentioned corresponding relation, can obtain by calculating and experiment, by way of example, such as 300V correspondence 100,200V correspondence 74,100V correspondence 42,50V correspondence 22, can also carry out some fine settings to number certainly.As long as can make the electric current flow through on the LED of driving consistent with the waveform of input voltage, input voltage is larger, and the electric current flow through on the LED of driving is larger, and input voltage is less, and the electric current flow through on the LED of driving is less.Afterwards, the number of the LED that can drive is as required controlled conducting and the disconnection of each switch, such as m=1 (the LED number that m is demand motive), so control switch S1 disconnects, the rest switch conducting, only have like this LED1 to light, m=3 for another example, so control switch S1 and S2 disconnect, the rest switch conducting, LED1 to LED3 lights like this, m=9 for another example, so control switch S1, S4 (S4 is not shown, the LED of its corresponding 8 series connection) disconnect, the rest switch conducting, have like this 9 LED and light.
Described ON-OFF control circuit 120 comprises analog to digital converter 121 and control circuit 122, and described analog to digital converter 121 is by described sampled voltage V
dvalue convert digital signal to.Store the corresponding relation of number of the LED of input voltage vin and its required driving in described control circuit 122, described control circuit 122 is according to digital sampled voltage V
dwith and the corresponding relation of internal memory storage determine the number of the LED of the current required driving of input voltage vin, and control conducting and the disconnection of each switch in described switch combination 130 according to the number of the LED of required driving.
The scheme of number of the LED of driving is adjusted in this variation according to input voltage vin, can be so that whole LED drive circuit do not need the energy-storage travelling wave tubes such as electric capacity or inductance are set, or only need the energy-storage travelling wave tubes such as less electric capacity or inductance just can satisfy the demands.Simultaneously, also can be so that the electric current flow through on driven LED can be followed the trail of the wave form varies track of input voltage, and then can, so that output current and input voltage keep same-phase, can make like this LED drive circuit integral body be pure resistive.Adopt the LED drive circuit of this structure, power factor can up to 95% or more than, improved greatly efficiency, can reduce the distortion of electric current simultaneously, prevent electromagnetic interference etc.
In one embodiment, described switch can be MOS transistor, such as PMOS or as shown in 1 NMOS, its grid is as the switch control end.
Described LED drive circuit in Fig. 1 and the LED 1 of its driving are to LED2
n-1 forms the LED illuminator in the present invention together.
In the embodiment of a change, each switch can be connected with the corresponding LED that respectively organizes, and respectively organize parallel connection mutually between LED, and be connected in parallel between input voltage vin and resistance R 3, each number of organizing between LED can differ 1, such as first group be 1, second group is 2 LED series connection, and the 3rd group is 3 LED series connection, and the 4th group is 4 LED series connection, the 5th group is 5 LED series connection, by that analogy.Now, when a switch conduction, the LED that this switch is corresponding is driven by described input voltage vin, and, when a switch turn-offs, the LED that this switch is corresponding will not driven by described input voltage vin.Like this, described ON-OFF control circuit 120 can be selected switch corresponding to conducting according to the number of the LED of the required driving of described input voltage vin.
Fig. 2 is the LED drive circuit circuit diagram in another embodiment in the present invention.In this embodiment, the number n of the switch that described switch combination 120 comprises equals 4, and the number of the LED of series connection is 2
4-1=15, each switch is the PMOS transistor.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that being familiar with any change that the person skilled in art does the specific embodiment of the present invention does not all break away from the scope of claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (6)
1. a LED drive circuit, is characterized in that, it comprises:
Voltage sampling circuit, the sampling input voltage obtains reflecting the sampled voltage of described input voltage;
Switch combination, comprise several switches, the LED of the corresponding one or more series connection of each switch, and when a switch conduction or shutoff, the LED that this switch is corresponding is driven by described input voltage;
ON-OFF control circuit, determine conducting and the disconnection of each switch in described switch combination according to described sampled voltage.
2. LED drive circuit according to claim 1, it is characterized in that, each switch and corresponding LED parallel connection, all LED connect mutually, when a switch turn-offs, the LED that the switch of this shutoff is corresponding is driven by described input voltage, and when a switch conduction, the LED that the switch of this conducting is corresponding is not driven by described input voltage.
3. LED drive circuit according to claim 2, is characterized in that, the number of the LED corresponding with each switch is 2
x, X is more than or equal to 0 integer, the different X value that each switch is corresponding, and the X value that each switch is corresponding is adjacent.
4. LED drive circuit according to claim 2, it is characterized in that, described ON-OFF control circuit obtains the number of the LED of the current required driving of input voltage according to the value of sampled voltage, and control conducting and the disconnection of each switch according to the number of the LED of the current required driving of input voltage, so that the wave form varies track of the Current Tracing input voltage flow through on the LED driven.
5. LED drive circuit according to claim 4, it is characterized in that, described ON-OFF control circuit comprises analog to digital converter and control circuit, described analog to digital converter converts the value of described sampled voltage to digital signal, store the corresponding relation of number of the LED of input voltage and its required driving in described control circuit, the number that described control circuit is determined the LED of the current required driving of input voltage according to currency and the described corresponding relation of digital sampled voltage, and control conducting and the disconnection of each switch according to the number of the LED of the current required driving of input voltage.
6. a LED illuminator, it includes several LED, it is characterized in that, and it comprises described LED drive circuit as arbitrary as claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101706412A CN103458551A (en) | 2012-05-28 | 2012-05-28 | Switch LED drive circuit and LED lighting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101706412A CN103458551A (en) | 2012-05-28 | 2012-05-28 | Switch LED drive circuit and LED lighting system |
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| CN2012101706412A Pending CN103458551A (en) | 2012-05-28 | 2012-05-28 | Switch LED drive circuit and LED lighting system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107487254A (en) * | 2016-08-03 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Lamp control system, method and vehicle before a kind of automotive self-adaptive |
| CN108519790A (en) * | 2018-03-19 | 2018-09-11 | 珠海格力电器股份有限公司 | A kind of control method of magnechuck, device and magnechuck |
| CN109392214A (en) * | 2017-08-09 | 2019-02-26 | 上海酷蓝电子科技有限公司 | A kind of linearity constant current control circuit adapting to full voltage input |
| CN112804781A (en) * | 2019-11-13 | 2021-05-14 | 上海路傲电子科技有限公司 | Control circuit, drive circuit, control method and lighting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107487254A (en) * | 2016-08-03 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Lamp control system, method and vehicle before a kind of automotive self-adaptive |
| CN109392214A (en) * | 2017-08-09 | 2019-02-26 | 上海酷蓝电子科技有限公司 | A kind of linearity constant current control circuit adapting to full voltage input |
| CN108519790A (en) * | 2018-03-19 | 2018-09-11 | 珠海格力电器股份有限公司 | A kind of control method of magnechuck, device and magnechuck |
| CN112804781A (en) * | 2019-11-13 | 2021-05-14 | 上海路傲电子科技有限公司 | Control circuit, drive circuit, control method and lighting device |
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Application publication date: 20131218 |