CN205105426U - Automatic linear constant current LED drive circuit of full voltage sectional type of switching mode - Google Patents
Automatic linear constant current LED drive circuit of full voltage sectional type of switching mode Download PDFInfo
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- CN205105426U CN205105426U CN201520815970.7U CN201520815970U CN205105426U CN 205105426 U CN205105426 U CN 205105426U CN 201520815970 U CN201520815970 U CN 201520815970U CN 205105426 U CN205105426 U CN 205105426U
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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
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Abstract
The utility model discloses an automatic linear constant current LED drive circuit of full voltage sectional type of switching mode, a serial communication port, including the at least two sets of LED that establish ties in proper order to and be used for detecting mains voltage's voltage detecting control circuit, each positive terminal of organizing LED is direct to link to each other with the power or links to each other with the power through change over switch, each negative pole end of organizing LED is respectively through corresponding control switch ground connection, wherein include two at least LED units of establishing ties in proper order among a set of LED, the negative pole end of every LED unit is through corresponding control switch ground connection, change over switch and control switch all insert and are controlled by the break -make of voltage detecting control circuit in order to change across block connection in series -parallel mode and different LED units. The utility model discloses drive circuit can switch LED's connection in series -parallel mode according to voltage, can also fall the low -harmonic -wave distortion and compromise power factor then according to the total load current of the convenient timely adjustment of stirring of voltage.
Description
Technical field
The utility model relates to lighting field, particularly relates to the drive circuit of a kind of LED.
Background technology
There is different powering modes different regions, at lighting field, the input of LED drive power comprises high pressure industrial frequency AC (i.e. civil power), low-voltage direct, high voltage direct current, low-voltage high-frequency interchange (output as electronic transformer) etc. under normal circumstances.Output then most of constant current source for can change voltage with the change of LED forward voltage drop value of LED drive power.
Now current type of drive has two kinds: first constant pressure source is for multiple constant-current source, and each constant-current source powers to separately every paths of LEDs.This mode, flexibly, a paths of LEDs fault, does not affect the work of other LED, but cost can omit height a bit in combination.Another kind is direct constant current-supplying, LED strip connection or parallel running.Its advantage is that cost is lower, but very flexible, also to solve certain LED fault, not affect the problem that other LED run.This two kinds of forms, deposit within a period of time.Multiple constant current exports supply power mode, can be better at cost and aspect of performance.Perhaps be later main flow direction.
For adapting to the difference of supply power voltage, disclose a kind of LED drive device dynamically changing series parallel structure with input voltage in Chinese patent application 201310110690.1, for driving LED matrix.Comprise input voltage sensing module, input voltage is compared from the different voltage ranges preset, and exports an input voltage status signal; A circuit series parallel structure control module, the control signal exporting correspondence according to input voltage status signal changes the constant-current source of total current size to switch combination and dynamic; A switch combination that can change LED matrix series parallel structure, dynamically changes the series parallel structure of LED matrix according to different control signals; A dynamic changes the constant-current source of total current size, and the total current size dynamically changing this constant-current source according to different control signals coordinates switch combination to make the electric current in unitary series of operations LED path remain on a continuous current scope.Efficiently solve the phenomenon that LED has dark space, clear zone, further reduce the stroboscopic problem of conventional ADS driving LED lamp when DC low-voltage.
Disclose a kind of Full-voltage serial-parallel LED in Chinese patent application 201310218352.X, it includes at least two LED unit, and is connected to the LED drive circuit of each LED unit and a string Parallel Control circuit; Wherein this connection in series-parallel control circuit includes at least one positive pole diverter switch, at least one negative pole diverter switch and one first voltage and detects and control circuit; Again each positive pole diverter switch and each negative pole diverter switch be connected respectively to each LED unit just, between negative electrode; When this first voltage detects with control circuit current for controlling each positive pole diverter switch and the conducting of negative pole diverter switch after low pressure stage voltage in detecting, make each LED unit parallel with one another; Otherwise, if high-tension electricity voltage then makes each LED unit mutually connect; Total cut-in voltage due to each LED unit after this series connection is increased to and can bears this high pressure section voltage completely, therefore can not burn after lighting.
Although above prior art can realize the change of connection in series-parallel pattern, how to take into account power factor flexibly and THD waits to solve always.
Utility model content
The utility model provides a kind of LED drive circuit, by reasonably by LED grouping, subdivision configuration, can change power factor flexibly and reduce THD.
A full voltage piece-wise linear constant current LED drive circuit for automatic switchover mode, is characterized in that, comprises at least two group LED connected successively, and for detecting the voltage detecting and controling circuit of supply voltage;
The positive terminal of each group of LED is directly connected with power supply or is connected with power supply by diverter switch; The negative pole end of each group of LED is respectively by corresponding control switch ground connection;
Wherein one group of LED comprises at least two LED unit of connecting successively, each LED unit negative pole end by corresponding control switch ground connection;
Described diverter switch and control switch all access and are controlled by described voltage detecting and controling circuit with the break-make of connection in series-parallel pattern and different LED unit between change group.
For in order to adapt to 120V and 277V two kinds of powering modes, the utility model adopts voltage detecting and controling circuit identify voltage and control diverter switch, when powering mode is 277V, diverter switch is closed, mean that each group of LED connects successively, diverter switch conducting when in like manner powering mode is 110V, each group of LED input is directly connected with power supply, realizes paralleling model to adapt to the difference of voltage.
Even powering mode is determined, voltage still has cyclic fluctuation, the utility model changes the on off operating mode of some LED unit by control switch, namely electric current and the pressure drop of overall drive circuit is changed, THD can be reduced when voltage cycle fluctuates and be less than 15% (total harmonic distortion), along with the voltage rise progressively more LED unit of conducting, when opposite voltage declines, progressively turn off some LED unit.
The sampling of voltage, the output of comparison and respective signal is realized by voltage detecting and controling circuit, namely voltage detecting and controling circuit can adopt the chip of write software to realize, also can adopt the voltage comparator circuit with logic function, by the judgement of supply voltage to open corresponding diverter switch and control switch.
In the utility model, often organize LED and comprise at least one or multiple LED of connecting successively, divide in the group of multiple LED unit, each LED unit comprises at least one or multiple LED of connecting successively.
The on off operating mode of the control switch of every LED unit can affect the conducting state in rear each LED unit, the assembled state of the control switch of different LED unit, the electric current of change entirety that can be interim.Same control switch is shared as the output of last LED unit in preferred same group and the output of place group LED.
The quantity of the LED of each LED unit group can be identical or different, and the break-make of varying number LED group switches, and can realize the more evolutions combination of electric current.
As preferably, each control switch by corresponding sampling resistor ground connection and respectively coupling has comparator, and the sampling end of comparator connects sampling resistor, through inputting constant current guard signal with the more backward corresponding control switch of reference signal.
Control switch, sampling resistor, comparator also can be considered and constitute current stabilization control unit.
Described diverter switch comprises triode and metal-oxide-semiconductor, and wherein the collector electrode of triode and emitter are connected to positive pole and the power positive end of corresponding group LED, and base stage connects power supply by the first divider resistance; Metal-oxide-semiconductor drain electrode connects the base stage of triode by the second divider resistance, source ground, grid connects described voltage detecting and controling circuit.
Voltage detecting and controling circuit, by the control to metal-oxide-semiconductor, can change the voltage of (i.e. transistor base) between the first divider resistance and the second divider resistance, and the break-make then realizing triode controls (break-make of diverter switch).
As preferably, described LED is divided into 2 ~ 4 groups, and the LED sum in each group is roughly the same with specification, wherein first group of LED positive pole termination power, and negative pole end passes through control switch and sampling resistor ground connection;
The negative pole end of last group of LED connects the positive terminal of rear one group of LED by the diode of counterflow-preventing, wherein one or more groups LED last is divided into again 2 ~ 4 LED unit of series connection, and each LED unit negative pole end is separately respectively by the control switch of correspondence and sampling resistor ground connection; Transistor emitter in each diverter switch is connected to the input to one group of LED.
As further preferred, described LED is divided into two groups, first group of LED positive pole termination power, and negative pole end is by the first control switch and sampling resistor ground connection;
Second group of LED is divided into 3 LED unit of series connection, each LED unit negative pole end separately respectively by second, third, the 4th control switch and second, third, the 4th sampling resistor ground connection.
As preferably, in order to simplify circuit, the metal-oxide-semiconductor of described first control switch and diverter switch is same metal-oxide-semiconductor, and is accessed between the second divider resistance and metal-oxide-semiconductor drain electrode by diode at first group of LED output.
In order to regulate total load current flexibly further, as preferably, described sampling resistor is also parallel with distribution branch road, this distribution branch road comprises the distribution resistance of series connection mutually and is controlled by the dispense switch of voltage detecting and controling circuit.
As further preferably, the 3rd, the 4th sampling resistor is parallel with distribution branch road.
As preferably, between negative pole access the 3rd control switch of the second sampling resistor and the 3rd sampling resistor, between negative pole access the 4th control switch of the 3rd sampling resistor and the 4th sampling resistor.
The utility model drive circuit according to the connection in series-parallel pattern of voltage switching LED, conveniently can also adjust total load current according to stirring of voltage, then reduce harmonic distortion and take into account power factor timely.
Accompanying drawing explanation
Fig. 1 is the utility model theory diagram;
Fig. 2 is the circuit diagram of embodiment 1;
Fig. 3 is the structural representation of comparator and peripheral circuit;
The oscillogram that Fig. 4 is supply voltage when being 120V;
The oscillogram that Fig. 5 is supply voltage when being 277V;
Fig. 6 is the circuit diagram of the utility model embodiment 2;
Fig. 7 is the circuit diagram of the utility model embodiment 3;
Fig. 8 is the circuit diagram of the utility model embodiment 4.
Embodiment
See Fig. 1, the full voltage piece-wise linear constant current LED drive circuit of a kind of automatic switchover mode of the utility model, comprise the many groups LED connected successively, wherein one group of LED comprises multiple LED unit of connecting successively, the positive terminal of first group of LED is directly connected with power supply, all the other each group is connected with power supply by diverter switch, and the negative pole end of each group LED is respectively by corresponding control switch ground connection.
Voltage detecting and controling circuit detects the voltage of power output end, and corresponding control diverter switch is with connection in series-parallel pattern between change group.
The negative pole end of each LED unit is by corresponding control switch ground connection, and voltage detecting and controling circuit sends make-and-break signal to control switch, can change the on off operating mode of different units LED in group, realizes the stepped change of total current.
The utility model LED drive circuit mainly may be used for the mode of operation of two kinds of different electrical power voltages (such as 120V and 277V, 110V and 220V), makes it can both reach the constant current driver circuit for LED of small size of high efficiency, High Power Factor, low harmonics distortion under two kinds of supply voltages.
Suppose that V1 and V2 two kinds of ac input voltages provide constant current to drive to LED, if reference voltage is V0, and meet V1<V<V2.
During current detection voltage V=V1<V0, the output perseverance of comparator is 0 (or 1), the signal that comparator exports is by producing the voltage signal of an invariable logic control switch after lock-in circuit, these signals make each group of LED strip parallel connection cut, and switch by the break-make of each unit LEDs can compromise efficiency and THD (or power factor).
Situation during current detection voltage V=V2>V0, the output of comparator will correspondingly overturn, namely 1 (or 0) is become, the signal that comparator exports is by also producing the voltage signal of an invariable logic control switch after lock-in circuit, as long as there is this situation once, even if there is V<V0 afterwards, (locking) that the voltage signal of logic control switch also can not change.
Can allow V0=(V1+V2)/2 in practical operation, or allow V0 is large a little more a bit or adds filter circuit before testing circuit, the possibility of voltage detection circuit erroneous judgement can be reduced like this.
Certainly, as V2 ≈ 2V1, be divided into two groups of LED be relatively suitable for, if supply voltage V2 larger than V1 2 times or more times time, we can make three groups of LED or more groups into two groups of LED of the parallel connection regarded as under above-mentioned V1 supply voltage as required, thus LED can be allowed normally to work, simply increase the complexity of circuit.
The utility model can be used for the use for the AC power supplies such as 120V and 277V, 110V and 220V voltage, and under these two kinds of supply voltages, LED requirement can normally work, and the index of efficiency and THD can reach higher requirement.
Embodiment 1
See Fig. 2, such as, there are 120V and 277V two kinds of AC voltages, can V0=200V be established.
In figure, left side exports after rectification for alternating current, all LED are divided into two groups, wherein first group of LED1 (specifically comprising 4 LED), remaining is second group, and second component is three unit, is respectively unit LEDs 2 (specifically comprising 1 LED), unit LEDs 3 (specifically comprising 2 LED), unit LEDs 4 (specifically comprising 1 LED), each LED connects successively, is also serially connected with diode D1 and the resistance Rs of counterflow-preventing between first group and second group.
Diverter switch comprises triode Q and metal-oxide-semiconductor M0, and wherein the collector and emitter of triode Q connects the positive terminal of second group of LED and power output end base stage connects power output end by the first divider resistance Ra respectively;
Metal-oxide-semiconductor M0 is drained and is connect the base stage of triode Q by the second divider resistance Rb, and source ground, grid connects the output of voltage detecting and controling circuit.
The negative pole end of first group of LED is successively by metal-oxide-semiconductor M1 (being equivalent to control switch) and sampling resistor R1 ground connection.
In like manner three LED unit negative pole end respectively by:
Metal-oxide-semiconductor M2 (being equivalent to control switch) and sampling resistor R2 ground connection;
Metal-oxide-semiconductor M3 (being equivalent to control switch) and sampling resistor R3 ground connection;
Metal-oxide-semiconductor M4 (being equivalent to control switch) and sampling resistor R4 ground connection.
In Fig. 2, voltage detecting and controling circuit (omitting in figure) gathers the voltage of power output end, and sampling resistor R1, sampling resistor R2, sampling resistor R3, sampling resistor R4 place electric current, after respective handling, exporting the signal sw0 for controlling diverter switch, inputting the signal sw1 of each control switch, signal sw2, signal sw3, signal sw4.
See Fig. 3, for the sampled signal cs1 at sampling resistor R1 place, compare with reference voltage verf1 after resistance R0 and resistance Rf is converted to voltage signal v1, then output signal sw1 for controlling the break-make of metal-oxide-semiconductor M1.
During work, suppose V=120V, because V is less than V0 (200V) always, voltage detecting and controling circuit controls metal-oxide-semiconductor M0 and opens all the time, the first suitable divider resistance Ra, the size of the second divider resistance Rb can be set, ensure that the extremely low i.e. triode Q of triode Q base voltage opens completely, realize the parallel connection of two groups of LED.
Control metal-oxide-semiconductor M2 in addition to turn off all the time (no current), metal-oxide-semiconductor M1, metal-oxide-semiconductor M3, metal-oxide-semiconductor M4 can carry out linear constant current control.
Composition graphs 4, after powering on, metal-oxide-semiconductor M0, metal-oxide-semiconductor M1, the equal conducting of metal-oxide-semiconductor M3; Metal-oxide-semiconductor M2, metal-oxide-semiconductor M4 all disconnects, i.e. first group of LED, and the first two unit LEDs work of second group, and now power output end electric current rises to.
Along with voltage rise, then turned off by metal-oxide-semiconductor M3, metal-oxide-semiconductor M4 conducting, i.e. the equal conducting of all LED, power output end electric current rises to again.
Can to be compromised efficiency and THD by above Discrete control.
Another kind of situation, V=277V, now can control triode and metal-oxide-semiconductor M0, metal-oxide-semiconductor M1 all turn off, and realizes the series connection of all LED.
Composition graphs 5, along with the fluctuation first time of voltage is metal-oxide-semiconductor M2 conducting when electric current rises to, metal-oxide-semiconductor M3 turns off, and metal-oxide-semiconductor M4 turns off, and namely only has first group of LED and first module LED work.
Metal-oxide-semiconductor M2 turns off afterwards, and metal-oxide-semiconductor M3 conducting, metal-oxide-semiconductor M4 turn off and make first, second unit LEDs work, and electric current rises to again.
Again, metal-oxide-semiconductor M2 turns off, and metal-oxide-semiconductor M3 turns off, metal-oxide-semiconductor M4 conducting makes all LED work, and electric current rises to again.
Can in like manner control during voltage drop.
Further, power P, efficiency eta and THD (or power factor PF) index by regulating every group or the every number of unit LEDs, the resistance of each sampling resistor and reference voltage (the reference voltage verf1 in such as Fig. 3) can compromise under two kinds of supply voltages.
Resistance Rs can reduce metal-oxide-semiconductor M2, metal-oxide-semiconductor M3, the power consumption of metal-oxide-semiconductor M4 and the linear of increase LED.Certainly, resistance Rs also can replace with the LED of several series connection, and these LED can at 277V operating at voltages, and when can ensure that voltage is 277V like this, the efficiency of LED is higher.In addition, in order to reduce the problem that there are the possibility power consumptions too large (may burn out) such as metal-oxide-semiconductor M4 pipe when high tension voltage inputs further.If reduce metal-oxide-semiconductor M2, metal-oxide-semiconductor M2 that number that the power consumption of metal-oxide-semiconductor M3 can reduce unit LEDs 3 and unit LEDs 4 reduces, metal-oxide-semiconductor M3 pressure drop; And reduce the power consumption of metal-oxide-semiconductor M4, can increase a current compensation circuit for metal-oxide-semiconductor M4, principle is when high tension voltage inputs, and by compensating circuit, the electric current of metal-oxide-semiconductor M4 is reduced the power consumption reducing metal-oxide-semiconductor M4 greatly.
Embodiment 2
In embodiment 1, the logic of metal-oxide-semiconductor M0 and metal-oxide-semiconductor M1 can regard basic the same as when 120V and 277V, and be the function of metal-oxide-semiconductor M1 current limiting, metal-oxide-semiconductor M0 does not have, and this difference to cause the logic of other control switchs to change.
See Fig. 6, in the present embodiment, metal-oxide-semiconductor M0 and metal-oxide-semiconductor M1 only replaces with a metal-oxide-semiconductor, and this metal-oxide-semiconductor can be metal-oxide-semiconductor M1, for preventing adverse current, diode D6 is set between first group of LED negative pole end and metal-oxide-semiconductor M1, peripheral circuit can be simplified like this, reduce some peripheral circuit costs.
Embodiment 3
See Fig. 6, relative to embodiment 2, in the present embodiment, the earthing mode of the control switch of each LED unit is different, and namely cut-off current is different.
In figure between sampling resistor R2 negative pole end access metal-oxide-semiconductor M3 and sampling resistor R3; Between sampling resistor R3 negative pole end access metal-oxide-semiconductor M4 and sampling resistor R4.
This structure is exactly that these metal-oxide-semiconductors can automatically switch and the height not relying on electric power output voltage relative to an obvious advantage of line voltage detecting form, and therefore the degree of freedom of the lamp number of LED is higher.
Embodiment 4
Above embodiment, if require also to ensure that under two kinds of voltages (being assumed to be 120V and 277V) the total power P of LED is equal, still more difficult.
In addition in embodiment 3, if when reaching higher efficiency and THD, the correlation of the electric current flow through due to each unit LEDs is comparatively strong, and may cause has irrational current value to occur (namely certain section of LED current distribution can be too small or excessive relative to the electric current of other section of LED) in certain section of LED.
With reference to figure 7, the present embodiment can improve this deficiency, and can both reach the performance of high efficiency, High Power Factor, low harmonics distortion under these two kinds of supply voltages.
In figure, sampling resistor R3 and sampling resistor R4 is parallel with respectively and distributes resistance R30 and distribute resistance R40, and is respectively equipped with switch S 1 and switch S 2 on the distribution branch road of parallel connection, and wherein switch S 1 and switch S 2 are also controlled by voltage detecting and controling circuit.
Operation principle: when supply voltage is 120V, can allow switch S1 is closed, switch S 2 disconnects.
Due to power P led=I (electric current) * Vled (voltage) of LED, the average voltage drop ratio that when can think that this supply voltage is 277V and 120V roughly, in two kinds of situations, LED is total:
Vledv2/Vledv1≈V2/V1＝277/60≈4.6。
Arrange R40 ≈ 3R4, R30 ≈ 0, Rs LED replaces.
So the power P ledv1=Pledv2 of LED in two kinds of situations when will ensure that supply voltage is 277V and 120V, the average current ratio I ledv1/Iledv2 ≈ 4.6 that under two kinds of voltages, LED is total, so we set Vref2 (reference voltage corresponding to metal-oxide-semiconductor M2)=2.3*Vref1 (reference voltage corresponding to metal-oxide-semiconductor M1) in this case, make the power P under two kinds of supply voltages more close.
And when supply voltage is 277V, can allow switch S2 is closed, switch S 1 disconnects, allow Vref2 be switched to another value Vref2=Vref1 in this case.
Adopt this switching mode, greatly can improve the degree of freedom of every section of electric current under two kinds of voltages, allow THD reach higher while, under two kinds of voltages, the size of current of each section of LED strip also can not differ too many, and power can be transferred to close.
Found by artificial debugging, distributing resistance R30 is reasonable close to 0 in theory, therefore switch S 1 and distribute resistance R30 can with a MOS switch replacement, be integrated in sheet, this can reduce cost further.In a word, this structure can be compromised power under two kinds of voltages and THD index, and can ensure that the size of current that the LED of every section flows through can not differ from several times.
In the present embodiment under the condition that LED is abundant, as long as the sampling resistor of given suitable size and distribution resistance just can obtain desirable THD and efficiency, the size of current of every section of LED also can not differ from too much simultaneously, and the power of LED can be close under these two kinds of voltages, the cost of peripheral circuit is also acceptable.
Claims (10)
1. a full voltage piece-wise linear constant current LED drive circuit for automatic switchover mode, is characterized in that, comprises at least two group LED connected successively, and for detecting the voltage detecting and controling circuit of supply voltage; It is characterized in that:
The positive terminal of each group of LED is directly connected with power supply or is connected with power supply by diverter switch; The negative pole end of each group of LED is respectively by corresponding control switch ground connection;
Wherein one group of LED comprises at least two LED unit of connecting successively, and the negative pole end of each LED unit is by corresponding control switch ground connection;
Described diverter switch and control switch all access and are controlled by described voltage detecting and controling circuit with the break-make of connection in series-parallel pattern and different LED unit between change group.
2. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 1, it is characterized in that, often organize LED and comprise at least one or multiple LED of connecting successively, divide in the group of multiple LED unit, each LED unit comprises at least one or multiple LED of connecting successively.
3. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 2; it is characterized in that; each control switch is also mated respectively by corresponding sampling resistor ground connection comparator; the sampling end of comparator connects sampling resistor, through inputting constant current guard signal with the more backward corresponding control switch of reference signal.
4. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 3, it is characterized in that, described diverter switch comprises triode and metal-oxide-semiconductor, wherein the collector electrode of triode and emitter are connected to positive pole and the power positive end of corresponding group LED, and base stage connects power supply by the first divider resistance;
Metal-oxide-semiconductor drain electrode connects the base stage of triode by the second divider resistance, source ground, grid connects described voltage detecting and controling circuit.
5. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 4, it is characterized in that, described LED is divided into 2 ~ 4 groups, LED sum in each group is roughly the same with specification, wherein first group of LED positive pole termination power, negative pole end is by control switch and sampling resistor ground connection;
The negative pole end of last group of LED connects the positive terminal of rear one group of LED by the diode of counterflow-preventing, wherein one or more groups LED last is divided into again 2 ~ 4 LED unit of series connection, and each LED unit negative pole end is separately respectively by the control switch of correspondence and sampling resistor ground connection; Transistor emitter in each diverter switch is connected to the input to one group of LED.
6. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 5, it is characterized in that, described LED is divided into two groups, first group of LED positive pole termination power, and negative pole end is by the first control switch and sampling resistor ground connection;
Second group of LED is divided into 3 LED unit of series connection, each LED unit negative pole end separately respectively by second, third, the 4th control switch and second, third, the 4th sampling resistor ground connection.
7. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 6, it is characterized in that, the metal-oxide-semiconductor of described first control switch and diverter switch is same metal-oxide-semiconductor, and is accessed between the second divider resistance and metal-oxide-semiconductor drain electrode by diode at first group of LED output.
8. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 7, it is characterized in that, described sampling resistor is also parallel with distribution branch road, and this distribution branch road comprises the distribution resistance of series connection mutually and is controlled by the dispense switch of voltage detecting and controling circuit.
9. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 8, is characterized in that, the 3rd, the 4th sampling resistor is parallel with distribution branch road.
10. the full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode as claimed in claim 9, it is characterized in that, between negative pole access the 3rd control switch of the second sampling resistor and the 3rd sampling resistor, between negative pole access the 4th control switch of the 3rd sampling resistor and the 4th sampling resistor.
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