CN107979898A - Low-voltage LED linear drive circuit - Google Patents
Low-voltage LED linear drive circuit Download PDFInfo
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- CN107979898A CN107979898A CN201711451950.6A CN201711451950A CN107979898A CN 107979898 A CN107979898 A CN 107979898A CN 201711451950 A CN201711451950 A CN 201711451950A CN 107979898 A CN107979898 A CN 107979898A
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- 238000005070 sampling Methods 0.000 claims abstract description 33
- 238000007493 shaping process Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000011324 bead Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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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]
-
- 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]
Abstract
The present invention discloses low-voltage LED linear drive circuit, including：Shaping circuit, load circuit, voltage sampling circuit, voltage control circuit, current limit circuit, accumulator, first switch circuit and second switch circuit, when input quasi sine instantaneous voltage is relatively low, the control voltage that voltage sampling circuit collects is relatively low, voltage control circuit and first switch circuit turn-on, second switch circuit turns off, and the quasi sine voltage and accumulator of input at the same time power load circuit；When input quasi sine instantaneous voltage is higher, the control voltage that voltage sampling circuit collects is higher, voltage control circuit and the shut-off of first switch circuit, second switch circuit turn-on, the quasi sine voltage against load circuit power supply of input, while charge to accumulator.The configuration of the present invention is simple, can effectively realize the greater efficiency that system is maintained under relatively low LED conduction voltage drops state.
Description
Technical field
The invention belongs to electronic drive circuit control technology field, and in particular to a kind of low-voltage LED linear drive circuit.
Background technology
LED is as a kind of efficient new light sources, since with long lifespan, energy consumption is low, energy conservation and environmental protection, is just being widely used in each
Field illuminates.Lighting for LED needs drive circuit to be driven.However, existing drive circuit is in relatively low LED conduction voltage drops shape
Under state, its circuit it is less efficient.Higher loss is dissipated on constant current device, and the reliability of system is very poor.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention proposes a kind of low-voltage LED linear drive circuit.The invention enables
Low-voltage LED lamp bead is directly driven, improves system whole efficiency while saving system cost, and then improve the reliable of system
Property.
In order to achieve the above object, technical scheme is as follows：
Low-voltage LED linear drive circuit, including：
Shaping circuit, for the alternating current full wave of input to be rectified into quasi sine voltage；
Load circuit, includes the LED of one or more series connection；
Voltage sampling circuit, it is connected between the V+ and V- of the quasi sine voltage of input, and voltage sampling circuit is used
In acquisition control voltage, so as to control the turn-on and turn-off of voltage control circuit；
Voltage control circuit, it connects with load circuit, and in parallel with accumulator by second switch circuit；
Current limit circuit, it connects with load circuit, after load circuit is connected with current limit circuit, then opens with first
Circuit in parallel is closed, current limit circuit is used to limit the current value flowed through on load circuit；
When input quasi sine instantaneous voltage is relatively low, the control voltage that voltage sampling circuit collects is relatively low, voltage control
Circuit processed and first switch circuit turn-on, the shut-off of second switch circuit, the quasi sine voltage and accumulator of input are at the same time to negative
Carry circuit power supply；
When input quasi sine instantaneous voltage is higher, the control voltage that voltage sampling circuit collects is higher, voltage control
Circuit processed and the shut-off of first switch circuit, second switch circuit turn-on, the quasi sine voltage against load circuit power supply of input, at the same time
Charge to accumulator.
A kind of low-voltage LED linear drive circuit of the present invention is simple in structure, can effectively realize in relatively low LED conduction voltage drops shape
The greater efficiency of system is maintained under state.
Based on the above technical solutions, following improvement can also be done：
As preferable scheme, first switch circuit includes：Diode D1, and second switch circuit includes：Diode D2；
The cathode of diode D1 is connected with the anode and accumulator of diode D2 respectively, and anode and the load circuit of diode D1 connect
Connect；The cathode of diode D2 is connected with current limit circuit and voltage control circuit respectively, and the anode of diode D2 is respectively with two
The cathode of pole pipe D1 is connected with accumulator.
Using the above preferred scheme, simple in structure, component cost is low.
As preferable scheme, voltage control circuit is realized by voltage control current limit circuit, voltage control electric current limit
The current limit value of circuit processed reduces with the increase of control voltage.
Using the above preferred scheme, it is simple in structure.Working status transform security is reliable.
As preferable scheme, voltage control current limit circuit includes：Voltage controlled current source I1 and current limliting sampling resistor R；
Control voltage can control the size of voltage controlled current source I1 output currents.
Using the above preferred scheme, simple in structure, the security performance of circuit is high, and control effect is good.
As preferable scheme, voltage controlled current source I1 and current limliting sampling resistor R series connection, and the voltage controlled current source I1 after series connection
It is in parallel with accumulator again with current limliting sampling resistor R.
Using the above preferred scheme, it is simple in structure.
As preferable scheme, after constant-current source I1 is in parallel with accumulator, then connect with current limliting sampling resistor R.
Using the above preferred scheme, simple in structure, the security performance of circuit is high, has current switching defencive function.
As preferable scheme, voltage control circuit is realized by voltage controlled resistance circuit, voltage controlled resistance circuit
Resistance value with control voltage increase and increase.
Using the above preferred scheme, simple in structure, cost is low.
As preferable scheme, voltage controlled resistance circuit includes：Nmos pass transistor MN101, nmos pass transistor MN102 with
And resistance R3；
Source electrode of the source electrode of MN101 respectively with quasi sine the voltage V- and MN102 of input is connected, its grid and control voltage
Connection, and its drain electrode is connected with the grid and resistance R3 of MN102 respectively；
Source electrode of the source electrode of MN102 respectively with quasi sine the voltage V- and MN101 of input is connected, its grid respectively with
The drain electrode of MN101 is connected with resistance R3, and its cathode of drain electrode respectively with load circuit and diode D2 is connected；
Resistance R3 one end is connected with the drain electrode of MN101 and the grid of MN102 respectively, its another termination internal electric source Vdc.
Using the above preferred scheme, it is simple in structure, it is low using simple component, cost.
As preferable scheme, voltage sampling circuit includes：The resistance R1 and resistance R2 being connected in series, and resistance R1 and electricity
Hinder output voltage i.e. voltage in order to control between R2.
Using the above preferred scheme, the performance of circuit is more stable.
As preferable scheme, accumulator is one or more capacitance C in parallel.
Using the above preferred scheme, when using multiple capacitance C in parallel, its reserve of electricity bigger.
Brief description of the drawings
Fig. 1 is the module map of low-voltage LED linear drive circuit provided in an embodiment of the present invention.
Fig. 2 is one of circuit diagram of low-voltage LED linear drive circuit provided in an embodiment of the present invention.
Fig. 3 is current limit value (I_VCS) in voltage provided in an embodiment of the present invention control current limit circuit with control
The change curve of voltage (Vc).
Fig. 4 is the two of the circuit diagram of low-voltage LED linear drive circuit provided in an embodiment of the present invention.
Fig. 5 is the three of the circuit diagram of low-voltage LED linear drive circuit provided in an embodiment of the present invention.
Fig. 6 is the four of the circuit diagram of low-voltage LED linear drive circuit provided in an embodiment of the present invention.
Fig. 7 is the five of the circuit diagram of low-voltage LED linear drive circuit provided in an embodiment of the present invention.
Fig. 8 is the resistance value (R_VCS) of voltage controlled resistance circuit provided in an embodiment of the present invention with control voltage (Vc)
Change curve.
Fig. 9 is the six of the circuit diagram of low-voltage LED linear drive circuit provided in an embodiment of the present invention.
Figure 10 is the seven of the circuit diagram of low-voltage LED linear drive circuit provided in an embodiment of the present invention.
Wherein：1st, shaping circuit, 2, load circuit, 3, voltage sampling circuit, 4, voltage control circuit, 5, current limit electricity
Road, 6 accumulators, 7, first switch circuit, 8, second switch circuit.
Embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
In order to reach the purpose of the present invention, in some of embodiments of low-voltage LED linear drive circuit, as shown in Figure 1,
Low-voltage LED linear drive circuit includes：
Shaping circuit 1, for the alternating current full wave of input to be rectified into quasi sine voltage；
Load circuit 2, includes the LED of multiple series connection；
Voltage sampling circuit 3, it is connected between the V+ and V- of the quasi sine voltage of input, voltage sampling circuit 3
For acquisition control voltage, so as to control the turn-on and turn-off of voltage control circuit 4；
Voltage control circuit 4, it connects with load circuit 2, and in parallel with accumulator 6 by second switch circuit 8；
Current limit circuit 5, it connects with load circuit 2, after load circuit 2 is connected with current limit circuit 5, then with
One on-off circuit 7 is in parallel, and current limit circuit 5 is used to limit the current value flowed through on load circuit 2；
When input quasi sine instantaneous voltage is relatively low, the control voltage that voltage sampling circuit 3 collects is relatively low, voltage control
Circuit 4 and first switch circuit 7 processed turn on, and second switch circuit 8 turns off, and the quasi sine voltage and accumulator 6 of input are at the same time
Power to load circuit 2；
When input quasi sine instantaneous voltage is higher, the control voltage that voltage sampling circuit 3 collects is higher, voltage control
Circuit 4 and first switch circuit 7 processed turn off, and second switch circuit 8 turns on, and the quasi sine voltage against load circuit 2 of input is powered,
Charge at the same time to accumulator 6.
As shown in Fig. 2, wherein, first switch circuit 7 includes：Diode D1, and second switch circuit 8 includes：Diode
D2；The cathode of diode D1 is connected with the anode and accumulator 6 of diode D2 respectively, the anode and load circuit of diode D1
2 connections；The cathode of diode D2 is connected with current limit circuit 5 and voltage control circuit 4 respectively, the anode difference of diode D2
It is connected with the cathode and accumulator 6 of diode D1.
Wherein, accumulator 6 is a capacitance C.
A kind of low-voltage LED linear drive circuit of the present invention is simple in structure, after between V+ and V- being alternating current full wave rectification
Quasi sine voltage.
When input quasi sine instantaneous voltage is relatively low, the control voltage that voltage sampling circuit 3 collects is relatively low, voltage control
Circuit 4 and diode D1 conducting processed, diode D2 shut-offs, the quasi sine voltage and capacitance C of input at the same time power LED；When defeated
Enter quasi sine instantaneous voltage it is higher when, the control voltage that voltage sampling circuit 3 collects is higher, voltage control circuit 4 and two
Pole pipe D1 is turned off, and diode D2 conductings, the quasi sine voltage of input powers LED, while charges to capacitance C.
The present invention realizes the driving of LED using simple component, can effectively realize in relatively low LED conduction voltage drops shape
The greater efficiency of system is maintained under state.
As shown in figure 3, in order to further optimize the implementation result of the present invention, in other embodiment, remaining
Feature technology is identical, and difference is, voltage control circuit 4 is realized by voltage control current limit circuit 5, voltage control electricity
The current limit value for flowing limiting circuit 5 reduces with the increase of control voltage.
Using the above preferred scheme, it is simple in structure.
As shown in figure 4, further, voltage control current limit circuit 5 includes：Voltage controlled current source I1 and current limliting sampling resistor
R；Control voltage can control the size of voltage controlled current source I1 output currents.Voltage controlled current source I1 and current limliting sampling resistor R series connection,
And connect after voltage controlled current source I1 and current limliting sampling resistor R it is in parallel with capacitance C again.
Using the above preferred scheme, it is simple in structure.Fig. 5 show further the tool of voltage control current limit circuit 5
Body circuit structure.
As shown in fig. 6, in order to further optimize the implementation result of the present invention, in other embodiment, remaining
Feature technology is identical, and difference is, voltage control circuit 4 is realized by voltage control current limit circuit 5, voltage control electricity
The current limit value for flowing limiting circuit 5 reduces with the increase of control voltage.
Voltage control current limit circuit 5 includes：Voltage controlled current source I1 and current limliting sampling resistor R；Control voltage can control
The size of voltage controlled current source I1 output currents.After voltage controlled current source I1 is in parallel with capacitance C, then connect with current limliting sampling resistor R.
Using the above preferred scheme, simple in structure, the security performance of circuit is high, has current switching defencive function.Fig. 7
It show further the particular circuit configurations of voltage control current limit circuit 5.
As shown in figure 8, in order to further optimize the implementation result of the present invention, in other embodiment, remaining
Feature technology is identical, and difference is, voltage control circuit 4 is realized by voltage controlled resistance circuit, voltage controlled resistance
The resistance value of circuit increases with the increase of control voltage.
Using the above preferred scheme, simple in structure, cost is low.
As shown in figure 9, further, voltage controlled resistance circuit includes：Nmos pass transistor MN101, nmos pass transistor MN102
And resistance R3；
Source electrode of the source electrode of MN101 respectively with quasi sine the voltage V- and MN102 of input is connected, its grid and control voltage
Connection, and its drain electrode is connected with the grid and resistance R of MN102 respectively；
Source electrode of the source electrode of MN102 respectively with quasi sine the voltage V- and MN101 of input is connected, its grid respectively with
The drain electrode of MN101 is connected with resistance R3, and its cathode of drain electrode respectively with load circuit 2 and diode D2 is connected；
Resistance R3 one end is connected with the drain electrode of MN101 and the grid of MN102 respectively, its another termination internal electric source Vdc.
Using the above preferred scheme, it is simple in structure, compared with voltage control current limit circuit 5, using simple
Component, cost are low.
As shown in Figure 10, in order to further optimize the implementation result of the present invention, in other embodiment, remaining
Feature technology is identical, and difference is, current limit circuit 5 specifically includes：Amplifier, power tube and current limliting sampling resistor
R。
Using the above preferred scheme, the performance of circuit is more stable.
In order to further optimize the implementation result of the present invention, in other embodiment, remaining feature technology phase
Together, difference is, as shown in Figure 1, voltage sampling circuit 3 includes：The resistance R1 and resistance R2 being connected in series, and resistance R1
The output voltage i.e. voltage in order to control between resistance R2.
Using the above preferred scheme, simple in structure, the performance of circuit is more stable.
In order to further optimize the implementation result of the present invention, in other embodiment, remaining feature technology phase
Together, difference is, accumulator 6 is multiple capacitance C in parallel.
Using the above preferred scheme, it is simple in structure, reserve of electricity bigger.
For the preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art, do not taking off
On the premise of conceiving from the invention, various modifications and improvements can be made, these belong to protection scope of the present invention.
Claims (10)
1. low-voltage LED linear drive circuit, including：
Shaping circuit, for the alternating current full wave of input to be rectified into quasi sine voltage；
Load circuit, includes the LED of one or more series connection；
It is characterized in that, further include：
Voltage sampling circuit, it is connected between the V+ and V- of the quasi sine voltage of input, and voltage sampling circuit is used to adopt
Collection control voltage, so as to control the turn-on and turn-off of voltage control circuit；
Voltage control circuit, it connects with load circuit, and in parallel with accumulator by second switch circuit；
Current limit circuit, it connects with the load circuit, after the load circuit is connected with current limit circuit, then with institute
First switch circuit in parallel is stated, the current limit circuit is used to limit the current value flowed through on the load circuit；
When input quasi sine instantaneous voltage is relatively low, the control voltage that voltage sampling circuit collects is relatively low, voltage control electricity
Road and first switch circuit turn-on, the shut-off of second switch circuit, the quasi sine voltage and accumulator of input are at the same time to load electricity
Road powers；
When input quasi sine instantaneous voltage is higher, the control voltage that voltage sampling circuit collects is higher, voltage control electricity
Road and the shut-off of first switch circuit, second switch circuit turn-on, the quasi sine voltage against load circuit power supply of input, while to storage
Energy circuit charges.
2. low-voltage LED linear drive circuit according to claim 1, it is characterised in that the first switch circuit includes：
Diode D1, and the second switch circuit includes：Diode D2；
The cathode of diode D1 is connected with the anode of diode D2 and the accumulator respectively, the anode of diode D1 with it is described
Load circuit connects；
The cathode of diode D2 is connected with the current limit circuit and the voltage control circuit respectively, the anode of diode D2
It is connected respectively with the cathode of diode D1 and the accumulator.
3. low-voltage LED linear drive circuit according to claim 2, it is characterised in that the voltage control circuit is by electricity
Voltage-controlled current limit circuit processed realizes, the current limit value of the voltage control current limit circuit with the increase of control voltage and
Reduce.
4. low-voltage LED linear drive circuit according to claim 3, it is characterised in that the voltage controls current limit
Circuit includes：Voltage controlled current source I1 and current limliting sampling resistor R；
The control voltage can control the size of voltage controlled current source I1 output currents.
5. low-voltage LED linear drive circuit according to claim 4, it is characterised in that voltage controlled current source I1 and current limliting are adopted
Sample resistance R connect, and connect after voltage controlled current source I1 and current limliting sampling resistor R it is in parallel with the accumulator again.
6. low-voltage LED linear drive circuit according to claim 4, it is characterised in that voltage controlled current source I1 and the storage
Can be after circuit in parallel, then connect with current limliting sampling resistor R.
7. low-voltage LED linear drive circuit according to claim 2, it is characterised in that the voltage control circuit is by electricity
Voltage-controlled resistance circuit processed realizes that the resistance value of the voltage controlled resistance circuit increases with the increase of control voltage.
8. low-voltage LED linear drive circuit according to claim 7, it is characterised in that the voltage controlled resistance circuit
Including：Nmos pass transistor MN101, nmos pass transistor MN102 and resistance R3；
Source electrode of the source electrode of MN101 respectively with quasi sine the voltage V- and MN102 of input is connected, its grid connects with control voltage
Connect, and its drain electrode is connected with the grid and resistance R3 of MN102 respectively；
Source electrode of the source electrode of MN102 respectively with quasi sine the voltage V- and MN101 of input is connected, its grid is respectively with MN101's
Drain electrode is connected with resistance R3, and its cathode of drain electrode respectively with load circuit and diode D2 is connected；
Resistance R3 one end is connected with the drain electrode of MN101 and the grid of MN102 respectively, its another termination internal electric source Vdc.
9. according to claim 1-8 any one of them low-voltage LED linear drive circuits, it is characterised in that the voltage sample
Circuit includes：The resistance R1 and resistance R2 being connected in series, and output voltage i.e. voltage in order to control between resistance R1 and resistance R2.
10. according to claim 1-8 any one of them low-voltage LED linear drive circuits, it is characterised in that the accumulator
For one or more capacitance C in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711451950.6A CN107979898A (en) | 2017-12-27 | 2017-12-27 | Low-voltage LED linear drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711451950.6A CN107979898A (en) | 2017-12-27 | 2017-12-27 | Low-voltage LED linear drive circuit |
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| Publication Number | Publication Date |
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| CN107979898A true CN107979898A (en) | 2018-05-01 |
Family
ID=62008235
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711451950.6A Pending CN107979898A (en) | 2017-12-27 | 2017-12-27 | Low-voltage LED linear drive circuit |
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| CN107371299A (en) * | 2017-08-29 | 2017-11-21 | 无锡麟力科技有限公司 | The linear constant current LED drive circuit and driving method of a kind of High Power Factor |
| CN206674254U (en) * | 2017-03-27 | 2017-11-24 | 深圳市梓晶微科技有限公司 | One kind is used for high power factor LED drive power switching frequency limiting circuit |
| CN207854227U (en) * | 2017-12-27 | 2018-09-11 | 苏州菲达旭微电子有限公司 | Low-voltage LED linear drive circuit |
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| KR20130027411A (en) * | 2011-09-07 | 2013-03-15 | 양태허 | Solid-state light emitting device having controllable multiphase reactive power |
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