CN107046751A - A kind of linear constant current LED drive circuit, driving chip and drive device - Google Patents
A kind of linear constant current LED drive circuit, driving chip and drive device Download PDFInfo
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- 229910052710 silicon Inorganic materials 0.000 claims abstract description 33
- 239000010703 silicon Substances 0.000 claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000005611 electricity Effects 0.000 claims description 6
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- 101000865038 Homo sapiens Histone-lysine N-methyltransferase SETD1A Proteins 0.000 description 1
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- LZHSWRWIMQRTOP-UHFFFAOYSA-N N-(furan-2-ylmethyl)-3-[4-[methyl(propyl)amino]-6-(trifluoromethyl)pyrimidin-2-yl]sulfanylpropanamide Chemical compound CCCN(C)C1=NC(=NC(=C1)C(F)(F)F)SCCC(=O)NCC2=CC=CO2 LZHSWRWIMQRTOP-UHFFFAOYSA-N 0.000 description 1
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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]
- H05B45/30—Driver circuits
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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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Abstract
The present invention is applied to field of LED drive technology there is provided a kind of linear constant current LED drive circuit, driving chip and drive device, and the circuit includes：Rectification module, constant-current driven module；And input voltage measurement module, detected for the output voltage to rectification module, generate voltage detecting value；Release control module, released signal or signal of releasing for generating stopping according to voltage detecting value；Release module, for being opened according to the signal shut-off that stops releasing to cut off leakage current, or according to signal of releasing to export leakage current.Judge to access without controllable silicon dimmer by control module of releasing, and voltage detecting value be between the first reference voltage level and turn-on voltage when, control release module cut-out leakage current, so as to reduce circuit loss, improve circuit efficiency.
Description
Technical field
The invention belongs to field of LED drive technology, more particularly to a kind of linear constant current LED drive circuit, driving chip and
Drive device.
Background technology
Light emitting diode (Light-Emitting Diode, LED) as a kind of new type light source, because its have brightness it is high,
Energy consumption is low and advantage of long lifespan and be widely used in every field, linear constant current drive scheme is with its simple system architecture
It is used widely in middle low power LED drive system.
Conventional controllable silicon light modulation linear constant current LED drive circuit is as shown in figure 1, the circuit includes controllable silicon light modulation at present
Device 10, rectification module 20, module of releasing 30, constant-current driven module 40 and LED load 50, can when not accessed in circuit shown in Fig. 1
When controlling silicon light modulator 10, before the output voltage of rectification module 20 rises to the conducting voltage of LED load 50, LED load 50
Middle no current, module of releasing 30 is turned on, and has leakage current to flow through in module of releasing 30；Rise in the output voltage of rectification module 20
To LED load 50 conducting voltage when, constant-current driven module 40 is turned on, and has electric current to flow through in LED load 50, and module of releasing 30 is closed
Close.It can be seen from the foregoing circuit course of work, when in controllable silicon light modulation linear constant current LED drive circuit without controllable silicon dimmer 10
During access, during LED load 50 is not turned on, there is leakage current to flow through always in module of releasing 30, the presence of leakage current increases
Big circuit loss, reduces the efficiency of circuit.
Therefore, because when being accessed in existing controllable silicon light modulation linear constant current LED drive circuit without controllable silicon dimmer,
There is leakage current during not turning on and flow through module of releasing in LED load, so as to cause circuit low in the presence of big, efficiency is lost always
Problem.
The content of the invention
It is an object of the invention to provide a kind of linear constant current LED drive circuit, it is intended to solves existing controllable silicon light modulation
There is during LED load is not turned on leakage current in linear constant current LED drive circuit always causes that circuit loss is big, efficiency is low
The problem of.
The present invention is achieved in that a kind of linear constant current LED drive circuit, is connected with LED load, the linear constant current
LED drive circuit includes：
Rectification module, for carrying out rectification to AC power, two inputs of the rectification module are connected with AC power,
First output end of the rectification module is connected with the input of the LED load；
Constant-current driven module, for the LED load carry out constant current driving, the output end of the constant-current driven module with
The output end connection of LED load, the earth terminal of the constant-current driven module is connected with the second output end of the rectification module；
Input voltage measurement module, is detected for the output voltage to the rectification module and generates voltage detecting
Value, the input and output end of the input voltage measurement module is defeated with the first output end of the rectification module and second respectively
Go out end connection；
Release control module, for when determine whether that controllable silicon dimmer is accessed according to the voltage detecting value, in nothing
Controllable silicon dimmer access when, and the voltage detecting value be more than the first reference voltage level and less than turn-on voltage when, generation
Stopping is released signal, and when there is controllable silicon dimmer access, and the voltage detecting value is when being less than the turn-on voltage,
Signal of releasing is generated, the input of the control module of releasing is connected with the test side of the input voltage measurement module；
Release module, for being released according to stopping signal shut-off of releasing to cut off leakage current, and according to described
Signal is opened and exports leakage current, controlled end, input and the output end of the module of releasing respectively with the control of releasing
The resistance connection end connection of the output end of module, the first output end of the rectification module and the constant-current driven module.
Another object of the present invention, which is also resided in, provides a kind of LED driving cores including above-mentioned linear constant current LED drive circuit
Piece.
Another object of the present invention, which is also resided in, provides a kind of LED driving dresses including above-mentioned linear constant current LED drive circuit
Put.
In the present invention, linear constant current LED drive circuit includes：Rectification module, constant-current driven module；And input voltage inspection
Module is surveyed, is detected for the output voltage to rectification module, voltage detecting value is generated；Release control module, for basis
The generation stopping of voltage detecting value is released signal or signal of releasing；Release module, for being cut off according to stopping releasing signal shut-off
Leakage current, or opened according to signal of releasing to export leakage current.By releasing, control module is judged without controllable silicon light modulation
Device access, and voltage detecting value be between the first reference voltage level and turn-on voltage when, control release module cut-out release
Electric current, so as to reduce circuit loss, improves circuit efficiency.
Brief description of the drawings
Fig. 1 is the structure chart for the controllable silicon light modulation linear constant current LED drive circuit that prior art is provided；
Fig. 2 is the structure chart of linear constant current LED drive circuit provided in an embodiment of the present invention：
Fig. 3 is the exemplary circuit figure of linear constant current LED drive circuit provided in an embodiment of the present invention；
Fig. 4 is the exemplary circuit figure of logic unit in linear constant current LED drive circuit provided in an embodiment of the present invention；
Fig. 5 is the exemplary circuit figure for the linear constant current LED drive circuit that another embodiment of the present invention is provided；
Fig. 6 is output voltage and the output of rectification module in linear constant current LED drive circuit provided in an embodiment of the present invention
The oscillogram of electric current；
Fig. 7 is the output voltage of rectification module in the controllable silicon light modulation linear constant current LED drive circuit that prior art is provided
With the oscillogram of output current.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 2 shows the structure of linear constant current LED drive circuit provided in an embodiment of the present invention, for convenience of description, only
Part related to the present invention is shown, details are as follows：
As a preferred embodiment of the present invention, the linear constant current LED drive circuit is connected with LED load 300, and including whole
Flow module 100, constant-current driven module 200, input voltage measurement module 400, control module of releasing 500 and module 600 of releasing.
Rectification module 100 carries out rectification to AC power, and two inputs of rectification module 100 are connected with AC power, whole
First output end of flow module 100 is connected with the input of LED load 300.Specifically, rectification module is rectifier bridge.
Constant-current driven module 200 carries out constant current driving, the output end and LED of constant-current driven module 200 to LED load 300
The output end connection of load 300, the earth terminal of constant-current driven module 200 is connected with the second output end of rectification module 100.
Input voltage measurement module 400 is detected to the output voltage of rectification module 100, generates voltage detecting value, defeated
The input and output end for entering voltage detection module 400 connect with the first output end of rectification module 100 and the second output end respectively
Connect.
Control module of releasing 500 determines whether that controllable silicon dimmer is accessed according to voltage detecting value, without thyristor regulating
When light device is accessed, and voltage detecting value is more than the first reference voltage level and during less than turn-on voltage, and generation stopping is released signal,
When there is controllable silicon dimmer access, and voltage detecting value, when being less than turn-on voltage, generation is released signal, control module of releasing
500 input is connected with the test side of input voltage measurement module 400；
Wherein, when accessing controllable silicon dimmer in linear constant current LED drive circuit, when controllable silicon dimmer is not turned on,
The output voltage values of now rectification module 100 are set to the first reference voltage level V1；When output voltage of rectification module 100 etc.
When the turn-on voltage of LED load 300, the magnitude of voltage that the test side of input voltage measurement module 400 is exported is led to be above-mentioned
Logical magnitude of voltage.
Specifically, control module 500 is released when voltage detecting value is equal to the first reference voltage level V1, and delay first is pre-
If after the time, judging whether voltage detecting value is less than the second reference voltage level V2 in the second preset time；
If so, then judging no controllable silicon dimmer access；
If it is not, then judging there is controllable silicon dimmer access.
Further specifically, the first preset time and the second preset time are two adjacent periods, the first preset time
End point be the second preset time starting point, the first preset time may be configured as N microseconds, N>0.As linear constant current LED
When accessing controllable silicon dimmer in drive circuit, when controllable silicon dimmer is maximum cut angle, by the defeated of now rectification module 100
Go out magnitude of voltage and be set to above-mentioned second reference voltage level V2；Second reference voltage level V2 is more than the first reference voltage level V1.
Module of releasing 600 is according to signal shut-off of releasing is stopped, to cut off leakage current, and is opened simultaneously according to signal of releasing
Export leakage current, controlled end, input and the output end of module of releasing 600 output end respectively with control module 500 of releasing,
First output end of rectification module 100 and the resistance connection end connection of constant-current driven module 200.
In the present embodiment, the AC rectification of input is direct current, input voltage measurement module 400 by rectification module 100
The DC voltage that rectification module 100 is exported is detected, and the voltage detecting value detected is exported to control module of releasing
500.When control module 500 of releasing judges that voltage detecting value is equal to the first reference voltage level V1, by the first preset time
After delay, control module of releasing 500 judges whether the voltage detecting value in the second preset time is less than the second reference voltage level V2,
If so, then showing without controllable silicon dimmer access in linear constant current LED drive circuit, in the premise accessed without controllable silicon dimmer
Under, when control module 500 of releasing judge voltage detecting value be more than the first reference voltage level V1 and less than turn-on voltage when, release
The output stopping of control module 500 releases signal so that module 600 of releasing is closed.I.e. when being accessed without controllable silicon dimmer, in electricity
Pressure detected value is more than the first reference voltage level V1 and LED load 300 does not turn on period, and module of releasing 600 is closed.
In the embodiment of the present invention, when being accessed in linear constant current LED drive circuit without controllable silicon dimmer, in LED load
300 do not turn in the part-time of period, and module of releasing 600 is to close, and reduces circuit loss, improves circuit efficiency.
Fig. 3 shows the exemplary circuit of linear constant current LED drive circuit provided in an embodiment of the present invention, for the ease of saying
It is bright, it illustrate only part related to the present invention.
As one embodiment of the invention, input voltage measurement module 400 includes：
First resistor R1 and second resistance R2；
First resistor R1 first end be input voltage measurement module 400 input, first resistor R1 the second end with
Second resistance R2 first end connects the test side to form input voltage measurement module 400 altogether, and second resistance R2 the second end is defeated
Enter the output end of voltage detection module 400.
As one embodiment of the invention, control module of releasing 500 includes：
First comparator A1, the second comparator A2 and logic unit 501；
First comparator A1 inverting input and the second comparator A2 in-phase input end connect to form control mould of releasing altogether
The input of block 500, first comparator A1 output end and the second comparator A2 output end respectively with logic unit 501
One input and the second input are connected, and first comparator A1 in-phase input end is connected with the first power supply, and second compares
Device A2 inverting input is connected with second source, and the output end of logic unit 501 is the output of control module 500 of releasing
End.
When logic unit 501 according to first comparator A1 output signal judge voltage detecting value be equal to the first reference voltage
During value V1, after the first preset time, if logic unit 501 according to the second comparator A2 output signal judge second it is default when
Interior voltage detecting value is less than the second reference voltage level V2, then is believed in logic unit 501 according to first comparator A1 output
Number judge that voltage detecting value is more than the first reference voltage level V1 and less than during turn-on voltage, the output of logic unit 501 stops
Signal release to module 600 of releasing, so that module 600 of releasing is closed.
Specifically, the output voltage values of the first power supply are the first reference voltage level V1, the output voltage values of second source are
Second reference voltage level V2.
The preferred implementation of logic unit 501 in the embodiment of the present invention, as shown in figure 4, logic unit 501 includes：
5th resistance R5, the 6th resistance R6, the first electric capacity C1, the second electric capacity C2, the first phase inverter G1, the second phase inverter
G2, the 3rd phase inverter G3, the 4th phase inverter G4, the 5th phase inverter G5, the first nor gate G6, the second nor gate G7, NAND gate G8,
Latch U1 and d type flip flop U2；
First phase inverter G1 input and latch U1 clear terminal CLR1 are respectively the first input of logic unit 501
End and the second input, the first phase inverter G1 output end is connected with the 5th resistance R5 first end, and the of the 5th resistance R5
The first end at two ends, the first electric capacity C1 first end and the 6th resistance R6 is connected to the second phase inverter G2 input altogether, and second is anti-
Phase device G2 output end, the 3rd phase inverter G3 input, the first of NAND gate G8 first input end and the second nor gate G7
Input is connected to the 3rd phase inverter G3 input, the 6th resistance R6 the second end, the second electric capacity C2 first end and the 5th altogether
Phase inverter G5 input is connected to the second nor gate G7 the second input, the 5th phase inverter G5 output end and NAND gate G8 altogether
The second input be connected, NAND gate G8 output end is connected with d type flip flop U2 set end SET2, the 3rd phase inverter G3
Output end be connected with the 4th phase inverter G4 input, the first of the 4th phase inverter G4 output end and the first nor gate G6
Input is connected, and the second nor gate G7 output end and latch U1 set end SET1 are connected to the of the first nor gate G6 altogether
Two inputs, the first nor gate G6 the 3rd input is connected with d type flip flop U2 output end Q2, latch U1 output end
Q1 is connected with d type flip flop U2 clear terminal CLR2, and the first nor gate G6 output end is the output end of logic unit 501, the
One electric capacity C1 the second end and the second electric capacity C2 the second end with being connected to power supply altogether, latch U1 input D1 and d type flip flop
U2 input D2 is connected to power supply altogether.
Specifically, the product of the 5th resistance R5 resistance and the first electric capacity C1 capacitance is the first preset time；6th
The product of resistance R6 resistance and the second electric capacity C2 capacitance is the second preset time.
As one embodiment of the invention, module of releasing 600 includes：
3rd comparator A3,3rd resistor R3, the 4th resistance R4 and switching tube S1；
The first end of 3rd comparator A3 controlled end, 3rd resistor R3 first end and the 4th resistance R4 is respectively to release
Controlled end, input and the output end of module 600, the 3rd comparator A3 in-phase input end and output end respectively with the 3rd power supply
It is connected with switching tube S1 controlled end, the 3rd comparator A3 inverting input is connected to the 4th altogether with switching tube S1 output end
Resistance R4 the second end, 3rd resistor R3 the second end is connected with switching tube S1 input.
The output of control module of releasing 500 stops releasing signal to the 3rd comparator A3 controlled end, so that the 3rd comparator
A3 stops output drive signal to switching tube S1, and then turns off switching tube S1, so that module 600 of releasing is closed；Release control
The output of molding block 500 releases signal to the 3rd comparator A3 controlled end, so that the 3rd comparator A3 output drive signals are to opening
Pipe S1 is closed, and then turns on switching tube S1, so that module 600 of releasing is turned on.
Specifically, the output voltage values of the 3rd power supply are the 3rd reference voltage level V3, it is anti-phase defeated as the 3rd comparator A3
When the input voltage value for entering end is more than the 3rd reference voltage level V3, the 3rd comparator A3 output low levels, so that switching tube S1 is closed
Disconnected, module of releasing 600 is closed.When the input voltage value of the 3rd comparator A3 inverting input is more than the 3rd reference voltage level V3
When, show that LED load 300 is turned on, constant-current driven module 200 works, now, module of releasing 600 is closed.
Specifically, switching tube S1 is NMOS tube, drain electrode, source electrode and the grid of NMOS tube are respectively switching tube S1 input
End, output end and controlled end.
As one embodiment of the invention, constant-current driven module 200 includes：
Current constant control chip U3 and the 7th resistance R7；
Current constant control chip U3 output and ground is respectively the output and ground of constant-current driven module 200,
Current constant control chip U3 resistance connection end meets the resistance company to form constant-current driven module 200 with the 7th resistance R7 first end altogether
End is connect, the 7th resistance R7 the second end is connected with current constant control chip U3 earth terminal.
Specifically, current constant control chip U3 can select model SM2082 chip.
In embodiments of the present invention, it is permanent as shown in figure 5, LED load 300 includes N number of light emitting diode and the 3rd electric capacity C3
Flowing the output end of drive module 200 includes i+1 sub- output end (O1~Oi+1), wherein, N is integer more than or equal to 1,0≤
I ＜ N, and i is integer；
N number of light emitting diode is sequentially connected in series, the first LED in N number of light emitting diode1Anode with
3rd electric capacity C3 first end connects the N light emitting diodes in the input to form LED load 300, N number of light emitting diode altogether
LEDNNegative electrode be connected with the 3rd electric capacity C3 the second end, the negative electrode of i light emitting diode in N number of light emitting diode and
N LEDsNNegative electrode be LED load 300 output end, the negative electrode and N of i light emitting diode light two
Pole pipe LEDNNegative electrode i+1 sub- output end (O respectively with constant-current driven module 2001~Oi+1) be connected.
The operation principle of linear constant current LED drive circuit is illustrated below in conjunction with Fig. 3, details are as follows：
The alternating current of input is converted to direct current by rectification module 100, and input voltage measurement module 400 is to rectification module
100 output voltage is detected, and voltage detecting value is exported to control module 500 of releasing.When logic unit 501 is according to
When one comparator A1 output signal judges that voltage detecting value is equal to the first reference voltage level V1, when first risen at the moment is preset
Between after, logic unit 501 judges voltage detecting value in the second preset time is whether according to the second comparator A2 output signal
Less than the second reference voltage level V2, if so, then judging that voltage is examined according to first comparator A1 output signal in logic unit 501
Measured value is more than the first reference voltage level V1 and less than during turn-on voltage, and the output stopping of logic unit 501 releases signal to letting out
Amplification module 600, so that module 600 of releasing is closed.It is more than the first reference voltage level V1 and less than conducting voltage in voltage detecting value
During value, module of releasing 600 is closed, and LED load 300 is not turned on, and constant-current driven module 200 does not work.It is worth in voltage detecting small
When the first reference voltage level V1, the output of logic unit 501 releases signal to module 600 of releasing, so that module 600 of releasing is led
Logical, leakage current flows through 3rd resistor R3, switching tube S1, the 4th resistance R4 and the 7th resistance R7, now, LED load 300 and not led
Logical, constant-current driven module 200 does not work.It is more than the turn-on voltage of LED load 300 in the output voltage values of rectification module 100
When, LED load 300 is turned on, and constant-current driven module 200 works, and the input voltage value of the 3rd comparator A3 inverting input is big
In the 3rd reference voltage level V3, the 3rd comparator A3 output low levels are so that switching tube S1 is turned off, that is, module of releasing 600 is closed.
The output voltage Vin of the rectification module 100 of circuit shown in Fig. 3 and output current Iin of rectification module 100 ripple
Shape figure is as shown in Figure 6；The output voltage Vin of the rectification module 20 of circuit shown in the Fig. 1 being previously mentioned in background of invention
Oscillogram with the output current Iin of rectification module 20 is as shown in Figure 7.Wherein, V11 is the electricity of input voltage measurement module 400
The output voltage values of corresponding rectification module 100 when pressing detected value for the first reference voltage level V1, VLED is LED load 300
Turn-on voltage, as Vin ＜ VLED, LED load 300 is not turned on, and Iin is produced by module 600 of releasing, as Vin >=VLED
When, LED load 300 is turned on, and Iin is the operating current of LED load 300.Contrasted from Fig. 6 and Fig. 7, in the Vin ＜ VLED phases
Between, circuit shown in Fig. 3 is in V11 ＜ Vin ＜ VLED, no leakage current, and module of releasing 600 is to close, and circuit shown in Fig. 1
In V11 ＜ Vin ＜ VLED, there is leakage current, module of releasing 600 is conducting.
In the embodiment of the present invention, during not turning in LED load 300, module 600 of being released in circuit shown in Fig. 3 relative to
The ON time of module of being released in circuit shown in Fig. 1 30 shortens, and therefore, circuit reduces circuit loss shown in Fig. 3, improves electricity
Road efficiency.
Application advantage based on above-mentioned linear constant current LED drive circuit in LED drive device, present invention also offers one
Planting includes the LED drive chip of above-mentioned linear constant current LED drive circuit.
Application advantage based on above-mentioned linear constant current LED drive circuit in LED drive device, present invention also offers one
Planting includes the LED drive device of above-mentioned linear constant current LED drive circuit.
In the embodiment of the present invention, linear constant current LED drive circuit includes：Rectification module, constant-current driven module；And input
Voltage detection module, is detected for the output voltage to rectification module, generates voltage detecting value；Release control module, use
Released signal or signal of releasing in generating stopping according to voltage detecting value；Release module, for according to stopping signal shut-off of releasing
To cut off leakage current, or opened to export leakage current according to signal of releasing.By releasing, control module is judged without controllable
Silicon light modulator is accessed, and voltage detecting value, when being between the first reference voltage level and turn-on voltage, control module of releasing is cut
Disconnected leakage current, so as to reduce circuit loss, improves circuit efficiency.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of linear constant current LED drive circuit, is connected with LED load, it is characterised in that the linear constant current LED drivings electricity
Road includes：
Rectification module, for carrying out rectification to AC power, two inputs of the rectification module are connected with AC power, described
First output end of rectification module is connected with the input of the LED load；
Constant-current driven module, for carrying out constant current driving, the output end and LED of the constant-current driven module to the LED load
The output end connection of load, the earth terminal of the constant-current driven module is connected with the second output end of the rectification module；
Input voltage measurement module, is detected for the output voltage to the rectification module and generates voltage detecting value, institute
State the first output end and the second output end of the input and output end of input voltage measurement module respectively with the rectification module
Connection；
Release control module, for when determine whether that controllable silicon dimmer is accessed according to the voltage detecting value, without controllable
Silicon light modulator access when, and the voltage detecting value be more than the first reference voltage level and less than turn-on voltage when, generation stop
Release signal, and when there is controllable silicon dimmer access, and the voltage detecting value is when being less than the turn-on voltage, generation
Release signal, the input of the control module of releasing is connected with the test side of the input voltage measurement module；
Release module, for releasing signal shut-off according to the stopping cutting off leakage current, and according to the signal of releasing
Open and export leakage current, controlled end, input and the output end of the module of releasing respectively with the control module of releasing
Output end, the resistance connection end connection of the first output end of the rectification module and the constant-current driven module.
2. linear constant current LED drive circuit as claimed in claim 1, it is characterised in that the control module of releasing is described
Voltage detecting value be equal to the first reference voltage level when, and be delayed the first preset time after, judge the voltage detecting value whether
It is less than the second reference voltage level in second preset time；
If so, then judging no controllable silicon dimmer access；
If it is not, then judging there is controllable silicon dimmer access.
3. linear constant current LED drive circuit as claimed in claim 1, it is characterised in that the input voltage measurement module bag
Include first resistor and second resistance；
The first end of the first resistor be the input voltage measurement module input, the second end of the first resistor with
The first end of the second resistance connects the test side to form the input voltage measurement module, the second end of the second resistance altogether
For the output end of the input voltage measurement module.
4. linear constant current LED drive circuit as claimed in claim 2, it is characterised in that the control module of releasing includes the
One comparator, the second comparator and logic unit；
The in-phase input end of the inverting input of the first comparator and second comparator connects to form the control of releasing altogether
The output end of the input of molding block, the output end of the first comparator and second comparator respectively with the logic list
The first input end and the second input of member are connected, and the in-phase input end of the first comparator is connected with the first power supply,
The inverting input of second comparator is connected with second source, and the output end of the logic unit is the control of releasing
The output end of module；
When the logic unit according to the output signal of the first comparator judge the voltage detecting value be equal to described first
During reference voltage level, after the first preset time, if the logic unit judges according to the output signal of second comparator
Voltage detecting value in second preset time is more than first reference voltage level and less than second reference voltage level,
Then judge that the voltage detecting value is more than the described first ginseng according to the output signal of the first comparator in the logic unit
Examine magnitude of voltage and less than during turn-on voltage, the logic unit output stopping releases signal to the module of releasing, so that
The module closing of releasing.
5. linear constant current LED drive circuit as claimed in claim 1, it is characterised in that the module of releasing includes the 3rd ratio
Compared with device, 3rd resistor, the 4th resistance and switching tube；
The first end of the controlled end of 3rd comparator, the first end of the 3rd resistor and the 4th resistance is respectively institute
State the controlled end, input and output end for module of releasing, the in-phase input end and output end of the 3rd comparator are respectively with
Three power supplys are connected with the controlled end of the switching tube, the inverting input of the 3rd comparator and the output of the switching tube
End is connected to the second end of the 4th resistance altogether, and the second end of the 3rd resistor is connected with the input of the switching tube；
The control module output of releasing stops releasing signal to the controlled end of the 3rd comparator, so that the described 3rd compares
Device stops output drive signal to the switching tube, and then turns off the switching tube, so that the module closing of releasing.
6. linear constant current LED drive circuit as claimed in claim 4, it is characterised in that the logic unit includes the 5th electricity
Resistance, the 6th resistance, the first electric capacity, the second electric capacity, the first phase inverter, the second phase inverter, the 3rd phase inverter, the 4th phase inverter,
Five phase inverters, the first nor gate, the second nor gate, NAND gate, latch and d type flip flop；
The input of first phase inverter and the clear terminal of the latch are respectively the first input end of the logic unit
With the second input, the output end of first phase inverter is connected with the first end of the 5th resistance, the 5th resistance
The second end, the first end of the first end of first electric capacity and the 6th resistance be connected to the input of second phase inverter altogether
End, the output end of second phase inverter, the input of the 3rd phase inverter, the first input end of the NAND gate and described
The first input end of second nor gate is connected to the input of the 3rd phase inverter altogether, the second end of the 6th resistance, described
The input of the first end of second electric capacity and the 5th phase inverter is connected to the second input of second nor gate altogether, described
The output end of 5th phase inverter is connected with the second input of the NAND gate, and the output end of the NAND gate is touched with the D
The set end of hair device is connected, and the output end of the 3rd phase inverter is connected with the input of the 4th phase inverter, described
The output end of 4th phase inverter is connected with the first input end of first nor gate, the output end of second nor gate with
The set end of the latch is connected to the second input of first nor gate, the 3rd input of first nor gate altogether
It is connected with the output end of the d type flip flop, the output end of the latch is connected with the clear terminal of the d type flip flop, institute
The output end for stating the first nor gate is the output end of the logic unit, the second end of first electric capacity and second electric capacity
The second end with being connected to power supply altogether, the input of the input of the latch and the d type flip flop is connected to power supply altogether.
7. linear constant current LED drive circuit as claimed in claim 1, it is characterised in that the constant-current driven module includes perseverance
Flow control chip and the 7th resistance；
The output and ground of the current constant control chip is respectively the output and ground of the constant-current driven module, institute
State the resistance connection end of current constant control chip and connect the electricity to form the constant-current driven module altogether with the first end of the 7th resistance
Connection end is hindered, the second end of the 7th resistance is connected with the earth terminal of the current constant control chip.
8. linear constant current LED drive circuit as claimed in claim 1, it is characterised in that the LED load includes N number of luminous
Diode and the 3rd electric capacity, the output end of the constant-current driven module include i+1 sub- output ends, wherein, N be more than or equal to
1 integer, 0≤i ＜ N, and i are integer；
N number of light emitting diode is connected in series, the anode of the first light emitting diode in N number of light emitting diode with it is described
The first end of 3rd electric capacity connects the N light-emitting diodes in the input to form the LED load, N number of light emitting diode altogether
The negative electrode of pipe is connected with the second end of the 3rd electric capacity, the negative electrode of i light emitting diode in N number of light emitting diode
And the output end that the negative electrode of N light emitting diodes is the LED load, the negative electrode and N luminous two of i light emitting diode
The negative electrode of pole pipe is connected with i+1 sub- output ends of the constant-current driven module respectively.
9. a kind of LED drive chip, it is characterised in that the LED drive chip is included described in any one of claim 1 to 8
Linear constant current LED drive circuit.
10. a kind of LED drive device, it is characterised in that the LED drive device is included described in any one of claim 1 to 8
Linear constant current LED drive circuit.
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