CN108377598A - LED lamp and LED drive circuit - Google Patents
LED lamp and LED drive circuit Download PDFInfo
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- CN108377598A CN108377598A CN201810394243.6A CN201810394243A CN108377598A CN 108377598 A CN108377598 A CN 108377598A CN 201810394243 A CN201810394243 A CN 201810394243A CN 108377598 A CN108377598 A CN 108377598A
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- led
- resistance
- lock unit
- control signal
- control
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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]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED lamp and LED drive circuits, wherein LED drive circuit includes：Control switch；From lock unit, it is connected from the first input end of lock unit and the second input terminal are corresponding with the both ends of control switch, it is used for output first control signal or second control signal when control switch is closed from lock unit, and self-locking is carried out to first control signal and second control signal；Constant current driving unit, one end of constant current driving unit is connected with the output end from lock unit, the other end of constant current driving unit is connected with the cathode of LED, the anode of LED is connected with default power supply, constant current driving unit is used to light or extinguish according to first control signal and second control signal control LED, and controls LED constant current work so that the brightness of LED remains unchanged when LED is lighted.LED drive circuit according to the present invention can not only carry out stability contorting to LED, ensure that brightness when LED is lighted is constant, and service life is long.
Description
Technical field
The present invention relates to field of LED drive technology, more particularly to a kind of LED drive circuit and a kind of LED lamp.
Background technology
Button latching mechanical switch is usually used to be controlled in existing automobile room lamp, but button latching mechanical is opened
The self-locking device long-time service in the Central Shanxi Plain can be failed due to abrasion, to influence the normal use of automobile room lamp.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
First purpose is to propose a kind of LED drive circuit, can not only carry out stability contorting to LED, ensure bright when LED is lighted
Spend constant, and service life is long.
Second object of the present invention is to propose a kind of LED lamp.
To achieve the above object, a kind of LED drive circuit that first aspect present invention embodiment proposes, including：Control is opened
It closes；It is described to be connected from the first input end of lock unit and the second input terminal are corresponding with the both ends of control switch from lock unit,
It is described to be used for output first control signal or second control signal when the control is switched and is closed from lock unit, and to described
First control signal and the second control signal carry out self-locking；Constant current driving unit, one end of the constant current driving unit with
The output end from lock unit is connected, and the other end of the constant current driving unit is connected with the cathode of LED, the sun of the LED
Pole is connected with default power supply, and the constant current driving unit is used for according to the first control signal and the second control signal control
It makes the LED to light or extinguish, and controls the LED constant current when the LED is lighted and work so that the brightness of the LED is protected
It holds constant.
LED drive circuit according to the ... of the embodiment of the present invention passes through the first control of output when control switch is closed from lock unit
Signal processed or second control signal, and self-locking is carried out to first control signal and second control signal, and driven by constant current
Moving cell is lighted or is extinguished according to first control signal and second control signal control LED, and LED is controlled when LED is lighted
Constant current operation is so that the brightness of LED remains unchanged.Stability contorting can not only be carried out to LED as a result, ensured when LED is lighted
Brightness is constant, and service life is long.
In addition, LED drive circuit according to the above embodiment of the present invention can also have following additional technical characteristic：
According to one embodiment of present invention, described to include from lock unit：First resistor, one end of the first resistor with
Second input terminal from lock unit is connected；First switch pipe, control terminal and the first resistor of the first switch pipe
The other end be connected with one end of second resistance, the other end of second resistance ground connection, the first end of the first switch pipe
It is respectively connected with one end, one end of the 4th resistance and one end of the 5th resistance of 3rd resistor, the other end of the 3rd resistor
It is connected from the first input end of lock unit with described, the other end of the 4th resistance is connected with the default power supply, and described
Second termination of one switching tube is describedly；First capacitance, one end of first capacitance and first input from lock unit
End is connected, and the other end of first capacitance is connected with the default power supply；Second switch pipe, the control of the second switch pipe
End is connected with the other end of the 5th resistance, and the first end of the second switch pipe is connected with one end of the 6th resistance, described
The other end of 6th resistance is connected with the default power supply, second end and the output from lock unit of the second switch pipe
End is connected；One end of 7th resistance, the 7th resistance is connected with described from the output end of lock unit, the 7th resistance it is another
One end is connected with one end of the 5th resistance.
According to one embodiment of present invention, the first switch pipe is NPN transistor, and the second switch pipe is
PNP transistor.
According to one embodiment of present invention, the control switch is touch key.
Further, in the initial state, the control switch is off, first input from lock unit
End is high level；When the control, which switchs, to be closed, second input terminal from lock unit is high level, the first switch
Pipe and second switch pipe conducting, the output end from lock unit export the first control signal so that LED points
It is bright, and the first control signal is input to second input terminal from lock unit by the 7th resistance, in institute
The first switch pipe and the second switch pipe are still in conducting state when stating control switch disconnection, with to first control
Signal carries out self-locking；When control switch is off, the first input end from lock unit is low level；When
When control switch is closed again, second input terminal from lock unit is low level, the first switch pipe and described
Second switch pipe disconnects, and the output end from lock unit exports the second control signal so that the LED extinguishes, and institute
It states second control signal and second input terminal from lock unit is input to by the 7th resistance, to be switched in the control
The first switch pipe and the second switch pipe are still in conducting state when disconnection, to be carried out certainly to the second control signal
Lock.
According to one embodiment of present invention, described to further include from lock unit：Second capacitance, one end of second capacitance
It is respectively connected with the other end of the 5th resistance and the control terminal of the first switch pipe, another termination of second capacitance
Describedly.
According to one embodiment of present invention, the constant current driving unit includes：Third switching tube, the third switching tube
Control terminal be connected with one end of the constant current driving unit, the first end of the third switching tube and the constant current driving unit
The other end be connected；One end of 8th resistance, the 8th resistance is connected with the second end of the third switching tube, and the described 8th
The other end of resistance is grounded；4th switching tube, the control terminal of the 4th switching tube and the second end of the third switching tube and
One end of 8th resistance is respectively connected with, the control terminal phase of the first end and the third switching tube of the 4th switching tube
Even, the second of the 4th switching tube terminates describedly.
Further, the constant current driving unit further includes：9th resistance, one end and the third of the 9th resistance
The control terminal of switching tube and the first end of the 4th switching tube are respectively connected with, and another termination of the 9th resistance is describedly.
According to one embodiment of present invention, the LED drive circuit further includes：Delay unit, the delay unit connect
From between the output end and one end of the constant current driving unit of lock unit described in being connected on, made by the delay unit described
Constant current driving unit controls the LED and gradually lights or extinguish.
According to one embodiment of present invention, the delay unit includes：Tenth resistance, one end of the tenth resistance with
The output end from lock unit is connected, and the other end of the tenth resistance is connected with one end of the constant current driving unit；The
Three capacitances, one end of the third capacitance are connected with the other end of the tenth resistance, the other end ground connection of the third capacitance.
To achieve the above object, second aspect of the present invention embodiment proposes a kind of LED lamp comprising above-mentioned LED
Driving circuit.
LED lamp according to the ... of the embodiment of the present invention can not only stablize LED by above-mentioned LED drive circuit
Control, ensures that brightness when LED is lighted is constant, and service life is long.
Description of the drawings
Fig. 1 is the block diagram of LED drive circuit according to the ... of the embodiment of the present invention；
Fig. 2 is the circuit diagram of LED drive circuit according to an embodiment of the invention；
Fig. 3 is the circuit diagram of LED drive circuit in accordance with another embodiment of the present invention；
Fig. 4 is the block diagram of LED drive circuit according to an embodiment of the invention；
Fig. 5 is the circuit diagram according to the LED drive circuit of another embodiment of the invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the LED drive circuit proposed according to embodiments of the present invention and have the driving circuit
LED lamp.
Fig. 1 is the block diagram of LED drive circuit according to the ... of the embodiment of the present invention.As shown in Figure 1, the embodiment of the present invention
LED drive circuit include：Control switch 100, from lock unit 200 and constant current driving unit 300.
Wherein, it is connected from the first input end of lock unit 200 and the second input terminal are corresponding with the control both ends of switch 100,
It is used for output first control signal or second control signal when controlling switch 100 and being closed from lock unit 200, and is controlled to first
Signal processed and second control signal carry out self-locking；One end of constant current driving unit 300 is connected with the output end from lock unit 200,
The other end of constant current driving unit 300 is connected with the cathode of LED, and the anode of LED is connected with default power supply V1, constant current driving unit
300 for lighting or extinguishing according to first control signal and second control signal control LED, and LED is controlled when LED is lighted
Constant current operation is so that the brightness of LED remains unchanged.
According to one embodiment of present invention, control switch 100 can be that touch key is touched when pressing touch key
Button is in closed state, that is, controls switch 100 and be closed；When unclamping touch key, touch key is off, that is, is controlled
Switch 100 is made to disconnect.
In practical applications, lighting or extinguish to LED can be realized by a touch key.Specifically, it is assumed that
Current LED is in OFF state, and when user presses touch key, touch key is closed, at this time from the output of lock unit 200 first
Signal (e.g., high level signal) is controlled to constant current driving unit 300, constant current driving unit 300 is controlled according to first control signal
LED is lighted and (cathode of LED e.g., is made to be low level).In the process, due to having from lock unit 200 to first control signal
Self-locking function, so when user unclamps touch key, it is the first control to be input to the control signal of constant current driving unit 300 still
Signal processed, so that LED is remain on state.Also, since constant current driving unit 300 has constant current function, thus in LED
During lighting, the electric current of LED is flowed through by control, can LED constant current be worked, to ensure that the brightness of LED is kept
It is constant.
And when user presses touch key again, touch key is closed, at this time from the output of lock unit 200 second control letter
Number (e.g., low level signal) to constant current driving unit 300, constant current driving unit 300 controls LED according to second control signal and extinguishes
(cathode of LED e.g., is made to be high level).In the process, due to having the self-locking work(to second control signal from lock unit 200
Can, so when user unclamps touch key again, the control signal for being input to constant current driving unit 300 is still that the second control is believed
Number, so that LED keeps OFF state.
LED drive circuit according to the ... of the embodiment of the present invention as a result, by exporting control signal from lock unit and believing control
Number self-locking is carried out, to carry out stability contorting to LED, and service life is long, while passing through constant current driving unit
Control LED constant current work, it is ensured that the brightness of LED is constant.
Further, according to one embodiment of present invention, as shown in Fig. 2, in above-mentioned LED drive circuit from lock unit
200 may include first resistor R1, first switch pipe Q1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5,
First capacitance C1, second switch pipe Q2, the 6th resistance R6, the 7th resistance R7.Wherein, one end of first resistor R1 with from lock unit
200 the second input terminal (B points) is connected；The control terminal of first switch pipe Q1 and the other end of first resistor R1 and second resistance R2
One end be connected, the other end of second resistance R2 ground connection, the first end of first switch pipe Q1 and one end of 3rd resistor R3, the 4th
One end of resistance R4 and one end of the 5th resistance R5 are respectively connected with, the other end of 3rd resistor R3 with from the first of lock unit 200
Input terminal (A points) is connected, and the other end of the 4th resistance R4 is connected with default power supply V1, the second end ground connection of first switch pipe Q1；
One end of first capacitance C1 is connected with the first input end from lock unit 200, the other end of the first capacitance C1 and default power supply V1
It is connected；The control terminal of second switch pipe Q2 is connected with the other end of the 5th resistance R5, the first end and the 6th of second switch pipe Q2
One end of resistance R6 is connected, and the other end of the 6th resistance R6 is connected with default power supply V1, the second end of second switch pipe Q2 and oneself
The output end (C points) of lock unit 200 is connected；One end of 7th resistance R7 is connected with the output end from lock unit 200, the 7th resistance
The other end of R7 is connected with one end of first resistor R1.
Wherein, first switch pipe Q1 is NPN transistor, and second switch pipe Q2 is PNP transistor.
Further, as shown in Fig. 2, in the initial state, control switch 100 is off, from lock unit 200
First input end is high level；It is high level from the second input terminal of lock unit 200, first opens when controlling the closure of switch 100
Pipe Q1 and the Q2 conductings of second switch pipe are closed, from the output end output first control signal of lock unit 200 so that LED is lighted, and
First control signal is input to the second input terminal from lock unit 200 by the 7th resistance R7, with when controlling the disconnection of switch 100
First switch pipe Q1 and second switch pipe Q2 is still in conducting state, to carry out self-locking to first control signal；When control switchs
100 when being off, and is low level from the first input end of lock unit 200；When control switch 100 is closed again, from
Second input terminal of lock unit 200 is low level, and first switch pipe Q1 and second switch pipe Q2 are disconnected, from the defeated of lock unit 200
Outlet exports second control signal so that LED extinguishes, and second control signal is input to by the 7th resistance R7 from lock unit
200 the second input terminal, with control switch 100 disconnect when first switch pipe Q1 and second switch pipe Q2 still in be connected shape
State, to carry out self-locking to second control signal.
Specifically, as shown in Fig. 2, in the initial state, the control terminal of first switch pipe Q1 passes through second resistance R2 quilts
Drop-down is low level, and first switch pipe Q1 is off, while the control terminal of second switch pipe Q2 is by the 4th resistance R4
It is high level to draw, and second switch pipe Q2 is off, and C point current potentials are low level, and constant current driving unit 300 is according to the low electricity
Flat control LED is in OFF state.Since touch key is off at this time, and first switch pipe Q1 and second switch pipe
Q2 is in closed state, therefore A point current potentials are equal to the voltage of default power supply V1, i.e. A point current potentials are high level.
When user presses touch key, since A point current potentials are that high level leads at this time so B points current potential is also high level
Crossing first resistor R1 makes the control terminal of first switch pipe Q1 become high level, the Q1 conductings of first switch pipe.In first switch pipe
After Q1 conductings, it is low level that the control terminal of second switch pipe Q2 is pulled down by the 5th resistance R5, and second switch pipe Q2 is connected, at this time
C point current potentials are high level, from the output first control signal of lock unit 200 (that is, high level signal) to constant current driving unit 300,
Constant current driving unit 300 controls LED according to first control signal and lights.Meanwhile first control signal is defeated by the 7th resistance R7
Enter B points, and input the control terminal of first switch pipe Q1 by first resistor R1 so that the control terminal of first switch pipe Q1 remains
High level, first switch pipe Q1 maintain conducting state, to realize the self-locking to entire circuit, i.e., to first control signal from
Lock, even if touch key disconnects at this time, entire circuit still keeps current state, and LED is still in illuminating state, to complete to turn on light
Process.
Wherein, it should be noted that after user presses touch key, since first switch pipe Q1 is in the conduction state,
So that the voltage of the first end of first switch pipe Q1 becomes 0, but due to the presence of the first capacitance C1, A points current potential is not
It can mutate, so A point current potentials can keep a period of time, so that circuit can complete stable self-locking.
After LED is lighted and user unclamps touch key, touch key will be off, at this time first switch pipe
The first end of Q1 is low level, and the first capacitance C1 and 3rd resistor R3 form charging circuit, with to the first capacitance C1 chargings, when the
After one capacitance C1 charging completes, A point current potentials are low level.When user presses touch key again, B point current potentials and A point current potentials
Identical, i.e. B points current potential is also low level, and the control terminal of first switch pipe Q1 is low level, and first switch pipe Q1 is disconnected, and second opens
It closes pipe Q2 also to disconnect therewith, C points current potential is low level at this time, and second control signal is exported (that is, low level is believed from lock unit 200
Number) to constant current driving unit 300, constant current driving unit 300 controls LED according to second control signal and extinguishes.Meanwhile second controls
Signal inputs B points by the 7th resistance R7, and the control terminal of first switch pipe Q1 is inputted by first resistor R1 so that first opens
The control terminal for closing pipe Q1 remains low level, and first switch pipe Q1 maintains off-state, to realize the self-locking to entire circuit,
I.e. to the self-locking of second control signal, even if touch key disconnects at this time, entire circuit still keeps current state, LED still in
OFF state, to complete process of turning off the light.
Wherein, it should be noted that after user presses touch key, since first switch pipe Q1 is off,
So that the voltage of the first end of first switch pipe Q1 becomes high level, but due to the presence of the first capacitance C1, A point current potentials
It can't mutate, so A point current potentials can keep a period of time, so that circuit can complete stable self-locking.
LED drive circuit according to the ... of the embodiment of the present invention as a result, passes through the self-locking list being made of electrical equipments such as transistors
Member output control signal simultaneously carries out self-locking to control signal, and the stability contorting lighted and extinguished to LED not only may be implemented, and
And due to not mechanical self-locking device so that the service life is longer.Also, when LED is in OFF state, open due to first
It closes pipe Q1 and second switch pipe Q2 and is in closed state, and the leakage current of first switch pipe Q1 and second switch pipe Q2 are almost
Zero, so the quiescent current of LED drive circuit is extremely low, it is almost nil.
Further, according to one embodiment of present invention, as shown in Fig. 2, in above-mentioned LED drive circuit from lock unit
200 may also include the second capacitance C2, the control of one end of the second capacitance C2 and the other end of first resistor R1 and first switch pipe Q1
End processed is respectively connected with, the other end ground connection of the second capacitance C2.Due to the presence of the first capacitance C1 and the second capacitance C2, control can be filtered out
The interference signal on switch 100 is made, so that LED drive circuit is more stablized.
According to one embodiment of present invention, as shown in figure 3, the constant current driving unit 300 in above-mentioned LED drive circuit is wrapped
Include third switching tube Q3, the 8th resistance R8 and the 4th switching tube Q4.Wherein, the control terminal of third switching tube Q3 and constant current driving are single
One end of member 300 is connected, and the first end of third switching tube Q3 is connected with the other end of constant current driving unit 300；8th resistance R8
One end be connected with the second end of third switching tube Q3, the other end of the 8th resistance R8 ground connection；The control terminal of 4th switching tube Q4
It is respectively connected with the second end of third switching tube Q3 and one end of the 8th resistance R8, the first end of the 4th switching tube Q4 is opened with third
The control terminal for closing pipe Q3 is connected, the second end ground connection of the 4th switching tube Q4.
Wherein, third switching tube Q3 and the 4th switching tube Q4 is NPN transistor.
Specifically, when in circuit only including third switching tube Q3, by the switching tube can realize LED light and
Extinguish control, for example, when exporting first control signal from lock unit 200, i.e. when C point current potentials are high level, third switching tube
Q3 is connected, and LED is lighted；When exporting second control signal from lock unit 200, i.e. when C point current potentials are low level, third switching tube
Q3 is disconnected, and LED extinguishes.But the current constant control to LED cannot achieve by the switching tube, therefore in the embodiment of the present invention
In, constant-current source circuit is constituted by third switching tube Q3 and the 4th switching tube Q4, the electric current of LED is flowed through with control, so that
LED can constant current operation, ensure that brightness when LED is lighted is constant.
Specifically, as shown in figure 3, when exporting first control signal from lock unit 200, the Q3 conductings of third switching tube, this
When electric current flow through the 8th resistance R8, since the control terminal of the 4th switching tube Q4 and the second end of the 4th switching tube Q4 are connected in parallel on the 8th
The both ends of resistance R8, and the second end of the 4th switching tube Q4 and control terminal are a PN junction, conducting voltage be about 0.7V (no
The corresponding conducting voltage of same switching tube is different), therefore when third switching tube Q3 is connected, the voltage at the 8th both ends resistance R8 begins
It is maintained at 0.7V eventually, thus the electric current for flowing through the 8th resistance R8 is always 0.7V/R (R is the resistance value of the 8th resistance R8), thus shape
At constant-current circuit so that the electric current is maintained when LED is lighted always, to ensure that the brightness of LED remains unchanged.
Wherein, the effect of the 4th switching tube Q4 is the electric current for the control terminal for adjusting third switching tube Q3 so that flows through third
The electric current of the first end and second end of switching tube Q3 is always 0.7V/R.
The constant-current source circuit being made up of as a result, third switching tube and the 4th switching tube can realize the current constant control to LED,
To achieve the purpose that constant-current driving LED so that the brightness of LED remains unchanged.
Further, as shown in figure 3, constant current driving unit 300 may also include the 9th resistance R9, one end of the 9th resistance R9
It is respectively connected with the control terminal of third switching tube Q3 and the first end of the 4th switching tube Q4, the other end ground connection of the 9th resistance R9,
The control terminal of third switching tube Q3 is pulled down by the 9th resistance R9, external disturbance can be effectively reduced.
According to one embodiment of present invention, as shown in figure 4, above-mentioned LED drive circuit may also include delay unit
400, delay unit 400 is connected between the output end and one end of constant current driving unit 300 of lock unit 200, passes through delay
Unit 400 is so that constant current driving unit 300 controls LED and gradually lights or extinguish.
Further, according to one embodiment of present invention, as shown in figure 5, delay unit 400 includes the tenth resistance R10
With third capacitance C3, wherein one end of the tenth resistance R10 is connected with the output end from lock unit 200, and the tenth resistance R10's is another
One end is connected with one end of constant current driving unit 300；One end of third capacitance C3 is connected with the other end of the tenth resistance R10, the
The other end of three capacitance C3 is grounded.
Specifically, as shown in figure 5, the tenth resistance R10 and third capacitance C3 forms RC delay circuits, when from lock unit
When 200 output first control signal, third switching tube Q3 delays can be made slowly to open, so that LED slowly brightens；Work as self-locking
When unit 200 exports second control signal, third switching tube Q3 delays slowly shutdown can be made, so that LED is slowly dimmed.By
This, can be such that the delay of third switching tube is slowly turned on and off by delay unit, gradually bright or gradually dark when to realize LED switch
Effect.
In conclusion LED drive circuit according to the ... of the embodiment of the present invention, by defeated when control switch is closed from lock unit
Go out first control signal or second control signal, and self-locking, Yi Jitong are carried out to first control signal and second control signal
It crosses constant current driving unit to light or extinguish according to first control signal and second control signal control LED, and when LED is lighted
LED constant current work is controlled so that the brightness of LED remains unchanged.Stability contorting can not only be carried out to LED as a result, ensure LED points
Brightness when bright is constant, and service life is long, while discrete component can be used to realize in the present invention, of low cost, is easy to real
It is existing.
In addition, the embodiment of the present invention also proposed a kind of LED lamp comprising above-mentioned LED drive circuit.
LED lamp according to the ... of the embodiment of the present invention can not only stablize LED by above-mentioned LED drive circuit
Control, ensures that brightness when LED is lighted is constant, and service life is long.
It should be appreciated that each section of the present invention can be realized with hardware, software, firmware or combination thereof.Above-mentioned
In embodiment, software that multiple steps or method can in memory and by suitable instruction execution system be executed with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit application-specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In addition, in the description of the present invention, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ",
"upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " clockwise ", " inverse time
The orientation or positional relationship of the instructions such as needle ", " axial direction ", " radial direction ", " circumferential direction " is to be based on the orientation or positional relationship shown in the drawings,
Be merely for convenience of description of the present invention and simplification of the description, do not indicate or imply the indicated device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (11)
1. a kind of LED drive circuit, which is characterized in that including：
Control switch；
It is described from the first input end of lock unit and the second input terminal phase corresponding with the both ends of control switch from lock unit
Even, described to be used for output first control signal or second control signal when the control is switched and is closed from lock unit and right
The first control signal and the second control signal carry out self-locking；
Constant current driving unit, one end of the constant current driving unit are connected with described from the output end of lock unit, and the constant current is driven
The other end of moving cell is connected with the cathode of LED, and the anode of the LED is connected with default power supply, and the constant current driving unit is used
It lights or extinguishes in controlling the LED according to the first control signal and the second control signal, and in the LED points
The LED constant current work is controlled when bright so that the brightness of the LED remains unchanged.
2. LED drive circuit as described in claim 1, which is characterized in that described to include from lock unit：
First resistor, one end of the first resistor are connected with described from the second input terminal of lock unit；
First switch pipe, one end phase of the control terminal of the first switch pipe and the other end of the first resistor and second resistance
Even, the other end of second resistance ground connection, the first end of the first switch pipe and one end of 3rd resistor, the 4th resistance
One end and one end of the 5th resistance are respectively connected with, the other end of the 3rd resistor and the first input end phase from lock unit
Even, the other end of the 4th resistance is connected with the default power supply, and the second termination of the first switch pipe is describedly；
First capacitance, one end of first capacitance are connected with described from the first input end of lock unit, first capacitance
The other end is connected with the default power supply；
Second switch pipe, the control terminal of the second switch pipe are connected with the other end of the 5th resistance, the second switch
The first end of pipe is connected with one end of the 6th resistance, and the other end of the 6th resistance is connected with the default power supply, and described
The second end of two switching tubes is connected with described from the output end of lock unit；
One end of 7th resistance, the 7th resistance is connected with described from the output end of lock unit, the 7th resistance it is another
End is connected with one end of the first resistor.
3. LED drive circuit as claimed in claim 2, which is characterized in that the first switch pipe is NPN transistor, institute
It is PNP transistor to state second switch pipe.
4. LED drive circuit as claimed in claim 3, which is characterized in that the control switch is touch key.
5. LED drive circuit as claimed in claim 4, which is characterized in that wherein,
In the initial state, the control switch is off, and the first input end from lock unit is high level；
When the control, which switchs, to be closed, second input terminal from lock unit is high level, the first switch pipe and institute
The conducting of second switch pipe is stated, the output end from lock unit exports the first control signal so that the LED is lighted, and
The first control signal is input to second input terminal from lock unit by the 7th resistance, to be opened in the control
The first switch pipe and the second switch pipe are still in conducting state when shutdown is opened, to be carried out to the first control signal
Self-locking；
When control switch is off, the first input end from lock unit is low level；
When control switch is closed again, second input terminal from lock unit is low level, the first switch pipe
It being disconnected with the second switch pipe, the output end from lock unit exports the second control signal so that the LED extinguishes,
And the second control signal is input to second input terminal from lock unit by the 7th resistance, in the control
The first switch pipe and the second switch pipe are still in conducting state when system switch disconnects, with to the second control signal
Carry out self-locking.
6. LED drive circuit as claimed in claim 2, which is characterized in that described to further include from lock unit：
Second capacitance, the control terminal of one end of second capacitance and the other end of the first resistor and the first switch pipe
It is respectively connected with, another termination of second capacitance is describedly.
7. LED drive circuit as described in claim 1, which is characterized in that the constant current driving unit includes：
The control terminal of third switching tube, the third switching tube is connected with one end of the constant current driving unit, and the third is opened
The first end for closing pipe is connected with the other end of the constant current driving unit；
One end of 8th resistance, the 8th resistance is connected with the second end of the third switching tube, the 8th resistance it is another
One end is grounded；
4th switching tube, the control terminal of the 4th switching tube and the second end of the third switching tube and the 8th resistance
One end is respectively connected with, and the first end of the 4th switching tube is connected with the control terminal of the third switching tube, the 4th switch
Second termination of pipe is describedly.
8. LED drive circuit as claimed in claim 7, which is characterized in that the constant current driving unit further includes：
The first of 9th resistance, one end of the 9th resistance and the control terminal of the third switching tube and the 4th switching tube
End is respectively connected with, and another termination of the 9th resistance is describedly.
9. LED drive circuit as described in claim 1, which is characterized in that further include：Delay unit, the delay unit connect
From between the output end and one end of the constant current driving unit of lock unit described in being connected on, made by the delay unit described
Constant current driving unit controls the LED and gradually lights or extinguish.
10. LED drive circuit as claimed in claim 9, which is characterized in that the delay unit includes：
One end of tenth resistance, the tenth resistance is connected with described from the output end of lock unit, the tenth resistance it is another
End is connected with one end of the constant current driving unit；
Third capacitance, one end of the third capacitance are connected with the other end of the tenth resistance, the third capacitance it is another
End ground connection.
11. a kind of LED lamp, which is characterized in that include the LED drive circuit as described in any one of claim 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810394243.6A CN108377598A (en) | 2018-04-27 | 2018-04-27 | LED lamp and LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810394243.6A CN108377598A (en) | 2018-04-27 | 2018-04-27 | LED lamp and LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108377598A true CN108377598A (en) | 2018-08-07 |
Family
ID=63032785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810394243.6A Withdrawn CN108377598A (en) | 2018-04-27 | 2018-04-27 | LED lamp and LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108377598A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103648214A (en) * | 2013-12-03 | 2014-03-19 | 北京经纬恒润科技有限公司 | Illuminating lamp control system |
| CN104470091A (en) * | 2014-11-21 | 2015-03-25 | 南京大学 | Low-power current self-locking LED controller |
| CN204362403U (en) * | 2015-02-10 | 2015-05-27 | 北京经纬恒润科技有限公司 | A kind of lighting lamp circuit |
| CN105451394A (en) * | 2015-12-25 | 2016-03-30 | 重庆睿博光电股份有限公司 | Reading lamp control device in automobile |
-
2018
- 2018-04-27 CN CN201810394243.6A patent/CN108377598A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103648214A (en) * | 2013-12-03 | 2014-03-19 | 北京经纬恒润科技有限公司 | Illuminating lamp control system |
| CN104470091A (en) * | 2014-11-21 | 2015-03-25 | 南京大学 | Low-power current self-locking LED controller |
| CN204362403U (en) * | 2015-02-10 | 2015-05-27 | 北京经纬恒润科技有限公司 | A kind of lighting lamp circuit |
| CN105451394A (en) * | 2015-12-25 | 2016-03-30 | 重庆睿博光电股份有限公司 | Reading lamp control device in automobile |
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Application publication date: 20180807 |