CN110198583A - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
- Publication number
- CN110198583A CN110198583A CN201910389874.3A CN201910389874A CN110198583A CN 110198583 A CN110198583 A CN 110198583A CN 201910389874 A CN201910389874 A CN 201910389874A CN 110198583 A CN110198583 A CN 110198583A
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- adjuster
- led
- circuit
- led circuit
- control signal
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- 230000005611 electricity Effects 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002045 lasting effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
Classifications
-
- 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]
-
- 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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention proposes a kind of LED drive circuit, the LED drive circuit includes first comparator, the first adjuster and the second adjuster, the first comparator first input end receives input voltage, second input terminal of first comparator receives first threshold, and the first comparator exports first control signal；The first adjuster first end connects the first LED circuit, the first adjuster second end ground connection；The second adjuster first end connects the second LED circuit, the second adjuster second end ground connection；First adjuster and the second adjuster control terminal receive the first control signal.Circuit of the present invention it is high-efficient, have a wide range of application.
Description
Technical field
The present invention relates to field of power electronics, in particular to a kind of LED drive circuit.
Background technique
In the prior art, alternating current obtains LED supply voltage to power to LED via rectifier.If the power supply of LED
Voltage is much larger than LED normal working voltage, then the application efficiency of supply voltage is low；, whereas if the supply voltage of LED is less than
LED normal working voltage, LED normal work cannot be guaranteed.Therefore, for double pressures or total pressure input, prior art LED
Driving circuit application range is small, low efficiency.
Summary of the invention
The object of the present invention is to provide a kind of efficient LED drive circuits, for solving input electricity of the existing technology
The problem for pressing utilization efficiency not high.
To achieve the above object, the present invention provides a kind of LED drive circuits, including first comparator, the first adjuster
With the second adjuster, the first comparator first input end receives input voltage, the input of first comparator second termination
First threshold is received, the first comparator exports first control signal；The first adjuster first end connects the first LED electricity
Road, the first adjuster second end ground connection；The second adjuster first end connects the second LED circuit, and described second is adjusted
Device second end ground connection；First adjuster and the second adjuster control terminal receive the first control signal；
When input voltage is greater than first threshold, the first control signal is latched, the first control signal control the
One LED circuit and the second LED circuit are connected, and the electric current of the series circuit is controlled by the first adjuster；When the input electricity
Pressure is super continuously less than first threshold after a period of time, and the first control signal exits latch mode, the first control letter
Number the first LED circuit of control and the second LED circuit are in parallel, and flow through the by the first adjuster and the control of the second adjuster respectively
The electric current of one LED circuit and the second LED circuit.
Optionally, the LED drive circuit further includes first switch tube and one-way conduction element, the first switch tube
The hot end of one end connection input voltage, the first LED circuit first end of the first switch tube second end connection, described first
Switch controlled end receives first control signal；The one-way conduction element anode connects the second LED circuit and the second adjuster
Common end, the common end of the one-way conduction element cathode connection first switch tube and the first LED circuit.
Optionally, when the input voltage is greater than first threshold, the first control signal controls the first switch
Pipe shutdown, the first adjuster work, second adjuster do not work, and first adjuster controls the series circuit
Electric current；
When the input voltage is super continuously less than first threshold after a period of time, described in the first control signal control
First switch tube conducting, first adjuster and second adjuster work, the first adjuster control flow through first
The electric current of the second LED circuit is flowed through in the electric current of LED circuit, the second adjuster control.
Optionally, the first LED circuit and the second LED circuit respectively include LED and capacitor, and the LED and the capacitor are in parallel.
Optionally, first adjuster includes the first amplifier and the first adjustment pipe, the first input of first amplifier
End receives first voltage, and the second input terminal of first amplifier connects input voltage cold end by the first sampling resistor,
The first amplifier control terminal receives the first control signal, and the output end of first amplifier connects the first adjustment pipe
Control terminal, the first end of the first adjustment pipe connects the second end of first LED circuit, the of the first adjustment pipe
Two ends connect the second end of first amplifier.
Optionally, second adjuster includes the second amplifier and second adjustment pipe, the first input of second amplifier
End receives first voltage, and the second input terminal of second amplifier connects input voltage cold end by the second sampling resistor,
The first amplifier control terminal receives the first control signal, and the output end of second amplifier connects the second adjustment pipe
Control terminal, the first end of the second adjustment pipe connects the second end of second LED circuit, the of the second adjustment pipe
Two ends connect the second end of second amplifier.
Optionally, first adjuster or second adjuster further include computing module, and the computing module connects
Sampled signal, the first adjustment factor and the reference voltage of input voltage are received, exports the first electric current after calculation process；First electricity
Stream flows through the pressure drop of the generation of 3rd resistor as the first voltage.
The present invention also provides a kind of LED drive circuit, including hysteresis loop comparator, the first adjuster and the second adjuster, institutes
It states hysteresis loop comparator first input end and receives input voltage, second input terminal of hysteresis loop comparator receives first threshold, described
Hysteresis loop comparator third input terminal receives second threshold, and the hysteresis loop comparator exports first control signal；Described first is adjusted
Device first end connects the first LED circuit, the first adjuster second end ground connection；The second adjuster first end connection second
LED circuit, the second adjuster second end ground connection；Described in first adjuster and the second adjuster control terminal receive
First control signal；
When input voltage is greater than first threshold, the first control signal controls the first LED circuit and the second LED circuit
It connects, and controls the electric current of the series circuit by the first adjuster；When the input voltage is less than second threshold, described the
One control signal controls the first LED circuit and the second LED circuit is in parallel, and passes through the first adjuster and the second adjuster control respectively
System flows through the electric current of the first LED circuit and the second LED circuit.
Optionally, the LED drive circuit further includes first switch tube and one-way conduction element, the first switch tube
The hot end of one end connection input voltage, the first LED circuit first end of the first switch tube second end connection, described first
Switch controlled end receives first control signal；The one-way conduction element anode connects the second LED circuit and the second adjuster
Common end, the common end of the one-way conduction element cathode connection first switch tube and the first LED circuit.
Optionally, when the input voltage is greater than first threshold, the first control signal controls the first switch
Pipe shutdown, the first adjuster work, second adjuster do not work, and first adjuster controls the series circuit
Electric current；
When the input voltage is less than second threshold, the first control signal controls the first switch tube conducting,
The electric current of the first LED circuit, institute are flowed through in first adjuster and second adjuster work, the first adjuster control
State the electric current that the second LED circuit is flowed through in the control of the second adjuster.
Compared with prior art, the invention has the following advantages that the input voltage when LED drive circuit is greater than first threshold
When, the first LED circuit and the second LED circuit are connected, and the upper electric current for controlling the series circuit is constant current；When the input voltage
When less than first threshold, the first LED circuit and the second LED circuit are in parallel, and the first LED circuit and second are flowed through in control respectively
The electric current of LED circuit is constant current.The present invention has a wide range of application, and improves the working efficiency of circuit.
Detailed description of the invention
Fig. 1 is LED drive circuit schematic diagram of the present invention；
Fig. 2 is the first adjuster schematic diagram of the invention；
Fig. 3 is the working waveform figure of one embodiment of this invention；
Fig. 4 is the working waveform figure of another embodiment of the present invention；
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, to convenient, the lucidly aid illustration embodiment of the present invention the mesh
's.
As shown in Figure 1, illustrating LED drive circuit schematic diagram of the present invention, the LED drive circuit includes first switch
Pipe, the first adjuster, the second adjuster and one-way conduction element.Exchange obtains driving circuit input electricity after inputting rectified circuit
Pressure.The first end of first LED circuit by the first switch tube connect input voltage hot end, described first
The second end of LED circuit connects the cold end of input voltage by first adjuster；The first of second LED circuit
The second end of the hot end of end connection input voltage, second LED circuit passes through second adjuster connection input electricity
The cold end of pressure；Anode the second LED circuit second end of connection of the one-way conduction element, the one-way conduction element are born
Pole connects the first end of the first LED circuit.First LED circuit and the second LED circuit respectively include LED and capacitor, the LED and should
Capacitor is in parallel.
In a kind of technical solution, LED drive circuit further includes first comparator, the first comparator first input end
Input voltage is received, second input terminal of first comparator receives first threshold, first control of first comparator output
Signal VC1, the control terminal that the first switch tube, the first adjuster and second are adjusted receive the first control signal respectively
VC1；When the input voltage VIN is greater than first threshold, the first control signal VC1 is latched, the first control signal
VC1 controls the first switch tube shutdown, the first adjuster work, and second adjuster does not work, the first LED circuit
It connects with the second LED circuit, first adjuster controls the electric current of the series circuit；When the input voltage VIN is lasting small
Super after a period of time in first threshold, the first control signal VC1 exits latch mode, the first control signal VC1
Control the first switch tube conducting, first adjuster and second adjuster work, the first LED circuit and second
LED circuit is in parallel, and the electric current of the first LED circuit is flowed through in the first adjuster control, and the second adjuster control flows through the
The electric current of two LED circuits.This scheme is conducive to invariable power or constant current output, and delivery efficiency is higher.
In another technical solution, LED drive circuit further includes hysteresis loop comparator, and the hysteresis loop comparator first inputs
End receives input voltage, and second input terminal of hysteresis loop comparator receives first threshold, the hysteresis loop comparator third input terminal
Second threshold is received, the hysteresis loop comparator exports first control signal.The first switch tube, the first adjuster and second are adjusted
The control terminal of section receives the first control signal respectively.When input voltage is greater than first threshold, the first control signal
Control first switch tube shutdown, the first adjuster work, second adjuster does not work, the first LED circuit and
The series connection of second LED circuit, first adjuster control the electric current of the series circuit；When the input voltage is less than second threshold
When, the first control signal controls the first switch tube conducting, first adjuster and second adjuster work,
First LED circuit and the second LED circuit are in parallel, and the electric current of the first LED circuit is flowed through in the first adjuster control, and described second
Adjuster controls the electric current for flowing through the second LED circuit, and this scheme control is simple.The first control letter in above two embodiment
It number can be an enable signal, control the first tune respectively according to first control signal is high level signal or low level signal
Section device is enabled or does not enable.
As shown in Fig. 2, illustrate first adjuster schematic diagram of the invention, first adjuster include the first amplifier U01,
The non-inverting input terminal of the first adjustment pipe M1 and computing module U02, the first amplifier U01 receive first voltage V1, described first
The inverting input terminal of amplifier U01 passes through the first sampling resistor R1 connection input voltage cold end, the control of the first amplifier U01
End processed receives the first control signal VC1, and the output end of the first amplifier U01 connects the control of the first adjustment pipe M1
End, the first end of the first adjustment pipe M1 connect the second end of first LED circuit, and the second of the first adjustment pipe M1
End connects the second end of the first amplifier U01.The computing module U02 receives the sampled signal VCS of input voltage, the first tune
Coefficient k 1 and reference voltage VREF are saved, exports the first electric current I1 after calculation process, specifically, sampled signal VCS and first is adjusted
Coefficient k 1, which is multiplied, obtains adjustment signal, and the difference of reference voltage VREF and adjustment signal is as the first electric current I1；Described
One electric current I1 flows through the pressure drop of the generation of 3rd resistor R3 as the first voltage V1.The first control signal VC1 is latched
Or latch mode is exited, first adjuster works always, and the first control signal VC1 controls first ratio always
It is enabled compared with device.
The difference of second adjuster and first adjuster is: second adjuster does not include operation mould
Block, and second adjuster only works when the input voltage VIN is less than or equal to first threshold；In addition, first control
After signal VC1 processed exits latch mode, the second adjuster of control is enabled；Otherwise, the first control signal VC1 control second is adjusted
Section device does not enable.
As shown in figure 3, the working waveform figure of one embodiment of this invention is illustrated, when input voltage VIN is greater than first
When threshold value VREF1, the first LED circuit and the series connection of the second LED circuit, input current 1/2IIN；When input voltage VIN is lasting small
Super after a period of time in first threshold VREF1, the first LED circuit and the second LED circuit are switched to parallel connection, and input current is
IIN；As normal working voltage VF of the input voltage VIN less than one group of LED, LED is not turned on, input current 0.
As shown in figure 4, illustrate the working waveform figure of another embodiment of the present invention, when input voltage VIN is greater than the
When one threshold value VREF1, the first LED circuit and the series connection of the second LED circuit, input current 1/2IIN；When input voltage VIN is less than
When second threshold VREF2, the first LED circuit and the second LED circuit are switched to parallel connection, input current IIN；Work as input voltage VIN
When normal working voltage VF less than one group of LED, LED is not turned on, input current 0.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (10)
1. a kind of LED drive circuit, it is characterised in that: including first comparator, the first adjuster and the second adjuster, described
One comparator first input end reception input voltage, the second input terminal of first comparator reception first threshold, described first
Comparator exports first control signal；The first adjuster first end connects the first LED circuit, first adjuster second
End ground connection；The second adjuster first end connects the second LED circuit, the second adjuster second end ground connection；Described first
Adjuster and the second adjuster control terminal receive the first control signal；
When input voltage is greater than first threshold, the first control signal is latched, and the first control signal controls the first LED
Circuit and the second LED circuit are connected, and the electric current of the series circuit is controlled by the first adjuster；When the input voltage continues
Super less than first threshold the first control signal exits latch mode after a period of time, and the first control signal controls
First LED circuit and the second LED circuit are in parallel, and flow through the first LED by the first adjuster and the control of the second adjuster respectively
The electric current of circuit and the second LED circuit.
2. LED drive circuit according to claim 1, it is characterised in that: the LED drive circuit further includes first switch
Pipe and one-way conduction element, the hot end of first switch tube first end connection input voltage, the first switch tube the
Two ends connect the first LED circuit first end, and the first switch tube control terminal receives first control signal；The one-way conduction member
Part anode connects the common end of the second LED circuit and the second adjuster, and the one-way conduction element cathode connects first switch tube
With the common end of the first LED circuit.
3. LED drive circuit according to claim 2, it is characterised in that: when the input voltage is greater than first threshold,
The first control signal controls the first switch tube shutdown, the first adjuster work, second adjuster not work
Make, first adjuster controls the electric current of the series circuit；
When the input voltage is super continuously less than first threshold after a period of time, the first control signal controls described first
The first LED electricity is flowed through in switching tube conducting, first adjuster and second adjuster work, the first adjuster control
The electric current of the second LED circuit is flowed through in the electric current on road, the second adjuster control.
4. LED drive circuit according to claim 2, it is characterised in that: the first LED circuit and the second LED circuit difference
Including LED and capacitor, the LED and the capacitor are in parallel.
5. LED drive circuit according to claim 1, it is characterised in that: first adjuster include the first amplifier and
The first input end of the first adjustment pipe, first amplifier receives first voltage, and the second input terminal of first amplifier passes through
First sampling resistor connects input voltage cold end, and the first amplifier control terminal receives the first control signal, described
The output end of first amplifier connects the control terminal of the first adjustment pipe, the first end connection described first of the first adjustment pipe
The second end of LED circuit, the second end of the first adjustment pipe connect the second end of first amplifier.
6. LED drive circuit according to claim 5, it is characterised in that: second adjuster include the second amplifier and
The first input end of second adjustment pipe, second amplifier receives first voltage, and the second input terminal of second amplifier passes through
Second sampling resistor connects input voltage cold end, and the second amplifier control terminal receives the first control signal, described
The output end of second amplifier connects the control terminal of the second adjustment pipe, the first end connection described second of the second adjustment pipe
The second end of LED circuit, the second end of the second adjustment pipe connect the second end of second amplifier.
7. LED drive circuit according to claim 6, it is characterised in that: first adjuster or second tune
Saving device further includes computing module, and the computing module receives sampled signal, the first adjustment factor and the reference voltage of input voltage,
The first electric current is exported after calculation process；First electric current flows through the pressure drop of the generation of 3rd resistor as the first voltage.
8. a kind of LED drive circuit, it is characterised in that: described stagnant including hysteresis loop comparator, the first adjuster and the second adjuster
It returns comparator first input end and receives input voltage, second input terminal of hysteresis loop comparator receives first threshold, the hysteresis
Comparator third input terminal receives second threshold, and the hysteresis loop comparator exports first control signal；First adjuster
One end connects the first LED circuit, the first adjuster second end ground connection；The second adjuster first end connects the 2nd LED
Circuit, the second adjuster second end ground connection；First adjuster and the second adjuster control terminal receive described the
One control signal；
When input voltage is greater than first threshold, the first control signal controls the first LED circuit and the second LED circuit string
Join, and controls the electric current of the series circuit by the first adjuster；When the input voltage is less than second threshold, described first
It controls signal and controls the first LED circuit and the parallel connection of the second LED circuit, and controlled respectively by the first adjuster and the second adjuster
Flow through the electric current of the first LED circuit and the second LED circuit.
9. LED drive circuit according to claim 8, it is characterised in that: the LED drive circuit further includes first switch
Pipe and one-way conduction element, the hot end of first switch tube first end connection input voltage, the first switch tube the
Two ends connect the first LED circuit first end, and the first switch tube control terminal receives first control signal；The one-way conduction member
Part anode connects the common end of the second LED circuit and the second adjuster, and the one-way conduction element cathode connects first switch tube
With the common end of the first LED circuit.
10. LED drive circuit according to claim 9, it is characterised in that: when the input voltage is greater than first threshold
When, the first control signal controls the first switch tube shutdown, and the first adjuster work, second adjuster is not
Work, first adjuster control the electric current of the series circuit；
When the input voltage is less than second threshold, the first control signal controls the first switch tube conducting, described
The electric current of the first LED circuit is flowed through in first adjuster and second adjuster work, first adjuster control, and described the
Two adjusters control the electric current for flowing through the second LED circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910389874.3A CN110198583B (en) | 2019-05-10 | LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910389874.3A CN110198583B (en) | 2019-05-10 | LED driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110198583A true CN110198583A (en) | 2019-09-03 |
| CN110198583B CN110198583B (en) | 2024-06-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201433201A (en) * | 2013-02-01 | 2014-08-16 | Raydium Semiconductor Corp | Holding current circuit of LED driving apparatus and operating method thereof |
| CN105979630A (en) * | 2016-06-08 | 2016-09-28 | 杰华特微电子（杭州）有限公司 | Led drive circuit |
| US20160370816A1 (en) * | 2015-06-16 | 2016-12-22 | Silicon Laboratories Inc. | Pre-Charge Technique For A Voltage Regulator |
| CN107979892A (en) * | 2017-12-15 | 2018-05-01 | 杰华特微电子（杭州）有限公司 | Its ripple elimination circuit of reference voltage control circuit, control method and application |
| CN208369900U (en) * | 2018-05-08 | 2019-01-11 | 杰华特微电子（杭州）有限公司 | Ripple eliminates circuit and the LED control circuit using it |
| CN210202139U (en) * | 2019-05-10 | 2020-03-27 | 杰华特微电子（杭州）有限公司 | LED drive circuit |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201433201A (en) * | 2013-02-01 | 2014-08-16 | Raydium Semiconductor Corp | Holding current circuit of LED driving apparatus and operating method thereof |
| US20160370816A1 (en) * | 2015-06-16 | 2016-12-22 | Silicon Laboratories Inc. | Pre-Charge Technique For A Voltage Regulator |
| CN105979630A (en) * | 2016-06-08 | 2016-09-28 | 杰华特微电子（杭州）有限公司 | Led drive circuit |
| CN107979892A (en) * | 2017-12-15 | 2018-05-01 | 杰华特微电子（杭州）有限公司 | Its ripple elimination circuit of reference voltage control circuit, control method and application |
| CN208369900U (en) * | 2018-05-08 | 2019-01-11 | 杰华特微电子（杭州）有限公司 | Ripple eliminates circuit and the LED control circuit using it |
| CN210202139U (en) * | 2019-05-10 | 2020-03-27 | 杰华特微电子（杭州）有限公司 | LED drive circuit |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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