CN109511199A - LED control circuit and control method - Google Patents
LED control circuit and control method Download PDFInfo
- Publication number
- CN109511199A CN109511199A CN201811635745.XA CN201811635745A CN109511199A CN 109511199 A CN109511199 A CN 109511199A CN 201811635745 A CN201811635745 A CN 201811635745A CN 109511199 A CN109511199 A CN 109511199A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000005611 electricity Effects 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 11
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000008054 signal transmission Effects 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]
-
- 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 proposes a kind of LED control circuit and control method, the LED control circuit includes first switch circuit, second switch circuit and the first switching circuit, first switch circuit first end connects the hot end of supply voltage with the first LED circuit first end, first switch circuit second end connects the second LED circuit first end, first LED circuit second end connects second switch circuit first end, second LED circuit second end is connected with second switch circuit second end, the common end of first switching circuit first end connection first switch circuit and the second LED circuit, the common end of first switching circuit second end connection the first LED circuit and second switch circuit；The electric current of the first switching circuit is flowed through in detection, or flow through the electric current of the first LED circuit, or the electric current of the second LED circuit is flowed through, the state of first switch circuit and second switch circuit is controlled, to realize the series-parallel switching between the first LED circuit and the second LED circuit.The present invention can not acquire control of the supply voltage realization to LED circuit.
Description
Technical field
The present invention relates to field of power electronics, in particular to a kind of LED control circuit and control method.
Background technique
Prior art LED control circuit works as detection as shown in Figure 1, prior art LED control circuit includes LED1 and LED2
To supply voltage be high pressure when, first open the light pipe M1 and second switch M2 shutdown, diode D1 conducting, LED1 and LED2 string
Connection；When detecting supply voltage is low pressure, first switch tube M1 and second switch M1 conducting, diode D1 cut-off, LED1
Place branch and the place LED2 branch circuit parallel connection.In the prior art, it needs to acquire supply voltage just and can control the work of LED1 and LED2
Make mode, and supply voltage is larger, voltage acquisition higher cost.
Summary of the invention
The object of the present invention is to provide LED control circuit and control methods, adopt for solving needs of the existing technology
The problem of collecting supply voltage.
To achieve the above object, the present invention provides a kind of LED control circuits, including first switch circuit, second switch
Circuit and the first switching circuit, first switch circuit first end connect the high potential of supply voltage with the first LED circuit first end
End, first switch circuit second end connect the second LED circuit first end, and the first LED circuit second end connects second switch circuit
First end, the second LED circuit second end are connected with second switch circuit second end, and the first switching circuit first end connection first is opened
The common end on powered-down road and the second LED circuit, the first switching circuit second end the first LED circuit of connection and second switch circuit
Common end；
The electric current of the first switching circuit is flowed through in detection, perhaps flows through the electric current of the first LED circuit or flows through the 2nd LED
The electric current of circuit controls the state of first switch circuit and second switch circuit, to realize the first LED circuit and the 2nd LED electricity
Series-parallel switching between road.
Optionally, it detects the electric current for flowing through the first switching circuit, or flows through the electric current of the first LED circuit, Huo Zheliu
When crossing the electric current of the second LED circuit increases to respective threshold, controls first switch circuit and second switch circuit ends, first
LED circuit and the series connection of the second LED circuit；
It detects the electric current for flowing through the first switching circuit, perhaps flow through the electric current of the first LED circuit or flows through second
When the electric current of LED circuit is reduced to respective threshold, first switch circuit and the conducting of second switch circuit, the first LED circuit are controlled
Branch circuit parallel connection where place branch and the second LED circuit.
Optionally, the first switch circuit includes first switch tube, and the second switch circuit includes second switch；
When first switch tube and second switch are connected, the electric current for flowing through the first switching circuit is detected, or flow through the
The electric current of one LED circuit, or when flowing through the electric current of the second LED circuit and increasing to respective threshold controls first switch tube and the
The shutdown of two switching tubes；
When first switch tube and second switch turn off, the electric current for flowing through the first switching circuit is detected, or flow through the
The electric current of one LED circuit, or when flowing through the electric current of the second LED circuit and being reduced to respective threshold controls first switch tube and the
The conducting of two switching tubes.
Optionally, the first switch circuit further includes first resistor, the first switch tube and first resistor series connection；Institute
Stating second switch circuit further includes second resistance, the second switch and second resistance series connection.
Optionally, it is constant current that control, which flows through the electric current of the first LED circuit and flows through the electric current of the second LED circuit,.
Optionally, first switching circuit include diode perhaps switching tube and the 3rd resistor diode or
Switching tube and 3rd resistor series connection.
Optionally, the first LED circuit perhaps the second LED circuit or the first switching circuit, further includes third switching tube
With the 4th resistance, the third switching tube and the series connection of the 4th resistance；When first LED circuit and the second LED circuit are connected, detection stream
The electric current of the first switching circuit is crossed, the electric current of the first LED circuit is perhaps flowed through or flows through the electric current of the second LED circuit, is passed through
Electric current in third switch controlled series arm.
Optionally, the LED control circuit further includes the second switching circuit, and the second switching circuit first end receives
Supply voltage, second end connect first switch circuit first end；Or the second switching circuit first end connects the 2nd LED
Circuit second end, second end ground connection；Second switching circuit includes third switching tube and the 4th resistance, the third switch
Pipe and the series connection of the 4th resistance；When first LED circuit and the second LED circuit are connected, the electric current of the first switching circuit is flowed through in detection, or
Person flows through the electric current of the first LED circuit, perhaps flows through the electric current of the second LED circuit or the electric current of the second switching circuit, passes through
Electric current in third switch controlled series arm.
The present invention also provides a kind of LED control method, first switch circuit first end is connected with the first LED circuit first end
The hot end of supply voltage, first switch circuit second end connect the second LED circuit first end, the first LED circuit second end
Second switch circuit first end is connected, the second LED circuit second end is connected with second switch circuit second end, the first switching circuit
First end connects the common end of first switch circuit and the second LED circuit, and the first switching circuit second end connects the first LED circuit
With the common end of second switch circuit；
The electric current of the first switching circuit is flowed through in detection, perhaps flows through the electric current of the first LED circuit or flows through the 2nd LED
The electric current of circuit controls the state of first switch circuit and second switch circuit, to realize the first LED circuit and the 2nd LED electricity
Series-parallel switching between road.
Compared with prior art, the invention has the following advantages that the electric current of the first switching circuit is flowed through in detection, or flow through
The electric current of first LED circuit, or flow through the electric current of the second LED circuit controls first switch circuit and second switch circuit
State, to realize the series-parallel switching between the first LED circuit and the second LED circuit.The present invention does not have to acquisition supply voltage, leads to
The electric current in the first switching circuit of detection is crossed, to switch the series-parallel relationship of lamp string.
Detailed description of the invention
Fig. 1 is prior art LED control circuit schematic diagram；
Fig. 2 is the first LED control circuit schematic diagram of the invention；
Fig. 3 is second of LED control circuit schematic diagram of the invention；
Fig. 4 is the third LED control circuit schematic diagram of the invention；
Fig. 5 is the 4th kind of LED control circuit schematic diagram of the invention；
Fig. 6 is the 5th kind of LED control circuit schematic diagram of the 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.
LED control circuit of the present invention includes the first LED circuit, the second LED circuit, first switch circuit, second switch electricity
For receiving supply voltage, first is opened for road and the first switching circuit, first switch circuit first end and the first LED circuit first end
Powered-down road second end connects the second LED circuit first end, and the first LED circuit second end connects second switch circuit first end, the
Two LED circuit second ends are connected with second switch circuit second end, the first switching circuit first end connect first switch circuit and
The common end of second LED circuit, the first switching circuit second end connect the common end of the first LED circuit and second switch circuit.
As shown in Fig. 2, illustrate the first of the invention LED control circuit schematic diagram, the first switch circuit includes the
One switching tube M1 and first resistor R1, first switch tube M1 and first resistor R1 series connection, first switch tube M1 first end, which receives, to be supplied
Piezoelectric voltage VDD.The second switch circuit includes second switch M2 and second resistance R2, second switch M2 and second resistance
R2 series connection, second switch M2 second end ground connection.First LED circuit includes lamp string LED1, and the second LED circuit includes lamp string
LED2, third switching tube M3 and the 4th resistance R4, lamp string LED2, third switching tube M3 and the 4th resistance R4 series connection.First switching
Circuit includes 3rd resistor R3 and diode D1, and 3rd resistor R3 and diode D1 series connection, the first switching circuit include third electricity
When hindering R3 and switching tube, 3rd resistor R3 and switching tube series connection, and by the switch controlled at ideal diode.Supply voltage
When VDD is high pressure (such as 220V), diode D1 conducting detects there is electric current on resistance R3, first switch tube M1 and second is opened
Pipe M2 shutdown, LED1 and LED2 series connection are closed, the electric current of control third switching tube M3 is constant current.(example when supply voltage VDD is low pressure
Such as 110V), diode D1 ends, no current on resistance R3, branch where LED1 and the place LED2 branch circuit parallel connection, third switching tube
M3 is fully on, controls first switch tube M1, the electric current of second switch M2 is constant current.First switch tube M1, resistance R1 and electricity
Resistance R3 can be integrated in first piece, and second switch M2, second resistance R2, third switching tube M3 and the 4th resistance R4 can be integrated
In second piece, detects the resistance R3 in first piece and flow through electric current to control M1 switch state, detect in second piece
The electric current that resistance R4 flows through to control the working condition of second switch M2 and third switching tube M3, two chip chambers do not need into
The additional signal transmission of row can carry out switch control.
As shown in figure 3, illustrating second of LED control circuit schematic diagram of the invention, first switch circuit is opened including first
Pipe M1 and first resistor R1, first switch tube M1 and first resistor R1 series connection are closed, first switch tube M1 first end receives power supply electricity
Press VDD.The second switch circuit includes second switch M2 and second resistance R2, and second switch M2 and second resistance R2 go here and there
Connection, second switch M2 second end ground connection.First LED circuit includes lamp string LED1, third switching tube M3 and the 4th resistance R4, lamp
String LED1, third switching tube M3 and the 4th resistance R4 series connection, the second LED circuit includes lamp string LED2.First switching circuit includes
3rd resistor R3 and diode D1,3rd resistor R3 and diode D1 series connection.When supply voltage VDD is high pressure (such as 220V),
Diode D1 conducting, detects there is electric current on resistance R3, first switch tube M1 and second switch M2 shutdown, LED1 and LED2 string
Connection, the electric current of control third switching tube M3 are constant current.When supply voltage VDD is low pressure (such as 110V), diode D1 cut-off, electricity
No current on R3 is hindered, branch where LED1 and the place LED2 branch circuit parallel connection, control third switching tube M3 is fully on, control first
Switching tube M1, second switch M2 electric current be constant current.First switch tube M1, resistance R1 and resistance R3 can be integrated in first piece
Interior, second switch M2, second resistance R2, third switching tube M3 and resistance R4 can be integrated in second piece, detect first
Resistance R3 in piece flows through electric current with control switch pipe M1, M2 and M3 switch state, needs information to transmit between two chips.
As shown in figure 4, illustrating the third LED control circuit schematic diagram of the invention, first switch circuit is opened including first
Pipe M1 and first resistor R1, first switch tube M1 and first resistor R1 series connection are closed, first switch tube M1 first end receives power supply electricity
Press VDD.The second switch circuit includes second switch M2 and second resistance R2, and second switch M2 and second resistance R2 go here and there
Connection, second switch M2 second end ground connection.First LED circuit includes lamp string LED1, and the second LED circuit includes lamp string LED2.The
One switching circuit includes third switching tube M3,3rd resistor R3 and diode D1, third switching tube M3,3rd resistor R3 and two poles
Pipe D1 series connection.When supply voltage VDD is high pressure (such as 220V), diode D1 conducting detects there is electric current on resistance R3, first
Switching tube M1 and second switch M2 shutdown, LED1 and LED2 series connection, the electric current of control third switching tube M3 are constant current.Power supply electricity
When pressure VDD is low pressure (such as 110V), diode D1 ends, no current on resistance R3, props up where branch where LED1 and LED2
Road is in parallel, and control third switching tube M3 is fully on, controls first switch tube M1, the electric current of second switch M2 is constant current.The
One switching tube M1, resistance R1, resistance R3 and third switching tube M3 can be integrated in first piece, the electricity of second switch M2 and second
Resistance R2 can be integrated in second piece, detected the resistance R3 in first piece and flowed through electric current and opened with control switch pipe M1, M2 and M3
Off status needs information to transmit between two chips.
As shown in figure 5, illustrate 4th kind of LED control circuit schematic diagram of the invention, LED control circuit further includes second cutting
Circuit is changed, the second switching circuit includes third switching tube M3 and the 4th resistance R4, and third switching tube M3 and the 4th resistance R4 connect,
The series circuit first end receives supply voltage VDD, and second end connects first switch tube M1 first end.First switch circuit includes
First switch tube M1 and first resistor R1, first switch tube M1 and first resistor R1 series connection.The second switch circuit includes the
Two switching tube M2 and second resistance R2, second switch M2 and second resistance R2 series connection, second switch M2 second end ground connection.The
One LED circuit includes lamp string LED1, and the second LED circuit includes lamp string LED2.First switching circuit includes 3rd resistor R3 and two
Pole pipe D1, three resistance R3 and diode D1 series connection.When supply voltage VDD is high pressure (such as 220V), diode D1 conducting, detection
There are electric current, first switch tube M1 and second switch M2 shutdown, LED1 and LED2 series connection on to resistance R3, controls third switching tube
The electric current of M3 is constant current.When supply voltage VDD is low pressure (such as 110V), diode D1 ends, no current on resistance R3, LED1
Place branch and the place LED2 branch circuit parallel connection, control third switching tube M3 is fully on, controls first switch tube M1, second switch
The electric current of pipe M2 is constant current.
As shown in fig. 6, illustrate 5th kind of LED control circuit schematic diagram of the invention, LED control circuit further includes second cutting
Circuit is changed, the second switching circuit includes third switching tube M3 and the 4th resistance R4, and third switching tube M3 and the 4th resistance R4 connect,
Series circuit first end ground connection, second end connect LED2 second end.First switch circuit includes first switch tube M1 and first
Resistance R1, first switch tube M1 and first resistor R1 series connection.The second switch circuit includes the electricity of second switch M2 and second
Hinder R2, second switch M2 and second resistance R2 series connection, second switch M2 second end ground connection.First LED circuit includes lamp string
LED1, the second LED circuit include lamp string LED2.First switching circuit includes 3rd resistor R3 and diode D1,3rd resistor R3
It connects with diode D1.When supply voltage VDD is high pressure (such as 220V), diode D1 conducting detects on resistance R3 there is electricity
Stream, first switch tube M1 and second switch M2 shutdown, LED1 and LED2 series connection, the electric current of control third switching tube M3 are perseverance
Stream.When supply voltage VDD is low pressure (such as 110V), diode D1 cut-off, the upper no current of resistance R3, branch where LED1 with
Branch circuit parallel connection where LED2, control third switching tube M3 is fully on, the electric current of control first switch tube M1, second switch M2
For constant current.
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 (9)
1. a kind of LED control circuit, it is characterised in that: including first switch circuit, second switch circuit and the first switching circuit,
First switch circuit first end connects the hot end of supply voltage, first switch circuit second with the first LED circuit first end
The second LED circuit first end of end connection, the first LED circuit second end connect second switch circuit first end, the second LED circuit the
Two ends are connected with second switch circuit second end, and the first switching circuit first end connects first switch circuit and the second LED circuit
Common end, the first switching circuit second end connect the first LED circuit and second switch circuit common end；
The electric current of the first switching circuit is flowed through in detection, perhaps flows through the electric current of the first LED circuit or flows through the second LED circuit
Electric current, control the state of first switch circuit and second switch circuit, with realize the first LED circuit and the second LED circuit it
Between series-parallel switching.
2. LED control circuit according to claim 1, it is characterised in that:
It detects the electric current for flowing through the first switching circuit, perhaps flow through the electric current of the first LED circuit or flows through the 2nd LED electricity
When the electric current on road increases to respective threshold, first switch circuit and the cut-off of second switch circuit, the first LED circuit and second are controlled
LED circuit series connection；
It detects the electric current for flowing through the first switching circuit, perhaps flow through the electric current of the first LED circuit or flows through the 2nd LED electricity
When the electric current on road is reduced to respective threshold, first switch circuit and the conducting of second switch circuit, branch where the first LED circuit are controlled
Branch circuit parallel connection where road and the second LED circuit.
3. LED control circuit according to claim 1 or 2, it is characterised in that: the first switch circuit is opened including first
Guan Guan, the second switch circuit includes second switch；
When first switch tube and second switch are connected, the electric current for flowing through the first switching circuit is detected, or flow through the first LED
The electric current of circuit, or when flowing through the electric current of the second LED circuit and increasing to respective threshold, control first switch tube and second switch
Pipe shutdown；
When first switch tube and second switch turn off, the electric current for flowing through the first switching circuit is detected, or flow through the first LED
The electric current of circuit, or when flowing through the electric current of the second LED circuit and being reduced to respective threshold, control first switch tube and second switch
Pipe conducting.
4. LED control circuit according to claim 3, it is characterised in that: the first switch circuit further includes the first electricity
Resistance, the first switch tube and first resistor series connection；The second switch circuit further includes second resistance, the second switch
It connects with second resistance.
5. LED control circuit according to claim 4, it is characterised in that: the electric current and stream of the first LED circuit are flowed through in control
The electric current for crossing the second LED circuit is constant current.
6. LED control circuit according to claim 1, it is characterised in that: first switching circuit include diode or
Person's switching tube and 3rd resistor, the diode or switching tube and 3rd resistor series connection.
7. LED control circuit according to claim 3, it is characterised in that: the first LED circuit or the second LED circuit,
Or first switching circuit, it further include third switching tube and the 4th resistance, the third switching tube and the series connection of the 4th resistance；First
When LED circuit and the second LED circuit are connected, the electric current of the first switching circuit is flowed through in detection, or flows through the electricity of the first LED circuit
Stream, or the electric current of the second LED circuit is flowed through, pass through the electric current in third switch controlled series arm.
8. LED control circuit according to claim 3, it is characterised in that: the LED control circuit further includes second cutting
Circuit is changed, the second switching circuit first end receives supply voltage, and second end connects first switch circuit first end；Or
The second switching circuit first end connects the second LED circuit second end, second end ground connection；Second switching circuit includes
Third switching tube and the 4th resistance, the third switching tube and the series connection of the 4th resistance；First LED circuit and the second LED circuit string
When connection, the electric current of the first switching circuit is flowed through in detection, perhaps flows through the electric current of the first LED circuit or flows through the second LED circuit
Electric current or the second switching circuit electric current, pass through the electric current in third switch controlled series arm.
9. a kind of LED control method, it is characterised in that: first switch circuit first end connects confession with the first LED circuit first end
The hot end of piezoelectric voltage, first switch circuit second end connect the second LED circuit first end, and the first LED circuit second end connects
Second switch circuit first end is connect, the second LED circuit second end is connected with second switch circuit second end, the first switching circuit
One end connect first switch circuit and the second LED circuit common end, the first switching circuit second end connect the first LED circuit and
The common end of second switch circuit；
The electric current of the first switching circuit is flowed through in detection, perhaps flows through the electric current of the first LED circuit or flows through the second LED circuit
Electric current, control the state of first switch circuit and second switch circuit, with realize the first LED circuit and the second LED circuit it
Between series-parallel switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811635745.XA CN109511199A (en) | 2018-12-29 | 2018-12-29 | LED control circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811635745.XA CN109511199A (en) | 2018-12-29 | 2018-12-29 | LED control circuit and control method |
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| Publication Number | Publication Date |
|---|---|
| CN109511199A true CN109511199A (en) | 2019-03-22 |
Family
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| CN201811635745.XA Pending CN109511199A (en) | 2018-12-29 | 2018-12-29 | LED control circuit and control method |
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| CN107276412A (en) * | 2017-07-14 | 2017-10-20 | 杰华特微电子（杭州）有限公司 | A kind of control method of on-off circuit, control circuit and on-off circuit |
| CN107660019A (en) * | 2017-08-31 | 2018-02-02 | 开发晶照明（厦门）有限公司 | Light source and light emitting module |
| CN209710384U (en) * | 2018-12-29 | 2019-11-29 | 杰华特微电子（杭州）有限公司 | LED control circuit |
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