CN203039985U

CN203039985U - A LED change-over switch circuit using AC sectional driving technology

Info

Publication number: CN203039985U
Application number: CN 201320068716
Authority: CN
Inventors: 潘永雄; 元烽
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-02-05
Filing date: 2013-02-05
Publication date: 2013-07-03
Anticipated expiration: 2023-02-05

Abstract

The utility model discloses a LED change-over switch circuit using AC sectional driving technology. The LED change-over switch circuit comprises at least one group of electricity acquiring circuit (400) and one group of switch control circuit (401). The electricity acquiring circuit (400) comprises a first LED chipset (405) and a second LED chipset (406). The switch control circuit (401) comprises a level interface circuit (402), a driving circuit (403), and an electronic (404). The LED change-over switch circuit reduces the power consumption of the driving circuit and decreases voltage withstanding requirements of elements in the driving circuit so as to achieve high efficiency of a lamp. The LED change-over switch circuit has characteristics of reasonable design, convenience and practicality, effectively reducing cost, increasing the efficiency of the LED driving circuit, and increasing the luminous efficiency and the power factor PFC of the lamp.

Description

LED exchanges the switching switch circuit that segmentation drives

Technical field

The utility model relates to LED and exchanges the switching switch circuit that segmentation drives, be specifically related to a kind of switching switch circuit of the LED of being applicable to interchange segmentation driving and the LED of this switching switch circuit formation and exchange the branch segment drive circuit, generally be applicable to and adopt in the various LED lightings that exchange the segmentation type of drive.

Background technology

Led light source has advantages such as environmental protection, energy-conservation, long service life, driving voltage be low, be considered to the most promising lighting source of 21 century, be particularly suitable for the public place that office, classroom, market, parking lot, waiting room, subway, tunnel, road etc. need long-time illumination.

In the LED lighting, though adopt separate AC-DC Switching Power Supply constant current drive mode to solve the safety problem of LED lighting, drive current is big, causes the drive circuit complexity, poor reliability, and the cost height, efficient is low, and volume is big; On the other hand, the electrochemical capacitors that use in separate AC-DC Switching Power Supply cause life-span of driving power life-span led chip in the light fixture more, and for this reason, the LED of some no electrolytic capacitors drives, and exchanges Driving technique as LED and has been subjected to attention.

Existing LED exchanges the segmentation drive scheme and generally adopts the connected mode shown in accompanying drawing 1 or the accompanying drawing 2, seldom adopt the connected mode shown in the accompanying drawing 3, reason be switching switch control circuit not altogether, the power supply of the metal-oxide-semiconductor drive circuit in the switching switch control circuit can only be taken from rectification output high pressure+VCC simultaneously, power consumption is big on the one hand, big owing to voltage difference on the other hand, metal-oxide-semiconductor components of drive circuit requirement of withstand voltage height.Connected mode shown in accompanying drawing 1 or the accompanying drawing 2 only is suitable for sequential segment LED type of drive, does not support encoded segment LED type of drive, and number of fragments is limited, causes the LED luminaire efficiency not high.

Summary of the invention

The purpose of this utility model is to consider the problems referred to above and a kind of power consumption that reduces drive circuit is provided; Also reduced the requirement of withstand voltage of each element in the drive circuit, made the higher LED of luminaire efficiency exchange the switching switch circuit that segmentation drives.The utility model is reasonable in design, and is convenient and practical, reduced cost effectively, improved the efficient of led drive circuit, improved light efficiency and the power factor (PF) PFC of light fixture.

The technical solution of the utility model is: LED of the present utility model exchanges the switching switch circuit that segmentation drives, include at least one group of power-supply circuit and ON-OFF control circuit, wherein power-supply circuit (400) includes the led chip group of at least two groups series connection, be respectively the first led chip group and the second led chip group, ON-OFF control circuit includes electric level interface circuit, drive circuit, electronic switch; Wherein the input of electric level interface circuit is connected with control signal input CON, the power end of electric level interface circuit is connected with the positive pole of the first led chip group, the common potential reference point ground of electric level interface circuit is connected with the negative pole of the second led chip group, the output of electric level interface circuit is connected with the input of drive circuit, the power end VDD of drive circuit is connected with the positive pole of the first led chip group, the common potential reference point ground of drive circuit is connected with the negative pole of the second led chip group, the output of drive circuit is connected with first utmost point of electronic switch, second utmost point of electronic switch is connected with the negative pole of the first led chip group respectively and is connected with the positive pole of the second led chip group, the common potential reference point ground COM of electronic switch is connected with the negative pole of the second led chip group, and the negative pole of the first led chip group is connected with the positive pole of the second led chip group; When electronic switch is in cut-off state, the first led chip group and the second led chip group operate as normal, the forward voltage on the first led chip group and the second led chip group provides DC power supply for electric level interface circuit and drive circuit; When electronic switch is in conducting state, the first led chip group operate as normal, the second led chip group is not had forward voltage by the electronic switch bypass, and the forward voltage on the first led chip group provides DC power supply for electric level interface circuit and drive circuit.

Above-mentioned ON-OFF control circuit includes some groups, and ON-OFF control circuit becomes some sections LED to exchange the fractional scanning drive circuit with some groups of led chip fabrics in the power-supply circuit.

Above-mentioned some groups of ON-OFF control circuit also are connected with the fractional scanning control circuit, and some groups of ON-OFF control circuit connect and compose some sections LED with the fractional scanning control circuit and exchange the fractional scanning drive circuit.

The utility model compared with prior art has following advantage:

(1) this diverter switch utilizes the forward voltage of number LEDs chip working power to be provided for the drive circuit of metal-oxide-semiconductor conduction period.On the one hand, reduced the power consumption of metal-oxide-semiconductor drive circuit; Also reduced the requirement of withstand voltage of each element in the drive circuit on the other hand; The 3rd, can use the low pressure metal-oxide-semiconductor to make switch element, and low pressure metal-oxide-semiconductor conducting internal resistance is little, makes the efficient height of light fixture.

(2) behind the use switching switch circuit of the present utility model, can use segmentation to drive connection mode, constitute LED and exchange segmentation order drive circuit, also can constitute the segment encoding drive circuit.Under the control of coding driving governor, use 3 switching switch circuits can form eight sections LED type of drive, reduce LED effectively and exchanged the cost that divides segment drive circuit, improved the efficient of led drive circuit, improved light efficiency and the power factor (PF) PFC of light fixture.

Description of drawings

Accompanying drawing 1～2nd, the connected mode that existing LED light fixture segmentation type of drive generally adopts.

Accompanying drawing 3 is connected modes of fewer usefulness in the existing LED light fixture segmentation type of drive.

Accompanying drawing 4 is theory diagrams of the present utility model.

The circuit diagram of accompanying drawing 5 the utility model embodiment 1.

The theory diagram that accompanying drawing 6 the utility model embodiment, 2 power-supply circuits and ON-OFF control circuit are connected with the fractional scanning control circuit.

The circuit diagram of accompanying drawing 7 the utility model embodiment 3.

The circuit diagram of accompanying drawing 8 the utility model embodiment 4.

Embodiment

Theory diagram of the present utility model as shown in Figure 4, LED of the present utility model exchanges the switching switch circuit that segmentation drives, include at least one group of power-supply circuit 400 and ON-OFF control circuit 401, wherein power-supply circuit 400 includes the first led chip group 405 and the second led chip group 406, ON-OFF control circuit 401 includes electric level interface circuit 402, drive circuit 403, electronic switch 404, wherein the input of electric level interface circuit 402 is connected with control signal input CON, the output of electric level interface circuit 402 is connected with the input of drive circuit 403, the power end VDD of electric level interface circuit 402 and drive circuit 403 is connected with the positive pole of the first led chip group 405 and the output of drive circuit 403 is connected with first utmost point of electronic switch 404, second utmost point of electronic switch 404 is connected with the negative pole of the first led chip group 405 respectively and is connected with the positive pole of the second led chip group 406, and the 3rd utmost point of electronic switch 404 is connected with the negative pole of the second led chip group 406; The negative pole of the first led chip group 405 is connected with the positive pole of the second led chip group 406; When electronic switch 404 is in cut-off state, the first led chip group 405 and the second led chip group, 406 operate as normal, the forward voltage on the first led chip group 405 and the second led chip group 406 provides DC power supply for electric level interface circuit 402 and drive circuit 403; When electronic switch 404 is in conducting state, the first led chip group, 405 operate as normal, the second led chip group 406 is not worked by the electronic switch bypass, and the forward voltage on the first led chip group 405 provides DC power supply for electric level interface circuit 402 and drive circuit 403.

Above-mentioned electric level interface circuit 402 and drive circuit 403 are made up of photoelectric coupled device.

Above-mentioned electronic switch is made up of N ditch metal-oxide-semiconductor, and the drain D of N ditch metal-oxide-semiconductor is connected with the positive pole of led chip group 405, and the source S of N ditch metal-oxide-semiconductor connects the negative pole of led chip group 406, and the 3rd utmost point G of N ditch metal-oxide-semiconductor connects the output of drive circuit 403.

Above-mentioned power-supply circuit 400 and ON-OFF control circuit 401 include some groups, and power-supply circuit 400 and ON-OFF control circuit 401 connect and compose LED with fractional scanning control circuit 3 and exchange the switching switch circuit that fractional scanning drives.

In the present embodiment, include at least one group of power-supply circuit 400 and ON-OFF control circuit 401, wherein power-supply circuit 400 includes the series LED chipset that at least two groups are in series with some led chips, be respectively the first led chip group 405 and the second led chip group 406, ON-OFF control circuit 401 includes electric level interface circuit 402, drive circuit 403, electronic switch 404; Wherein the input of electric level interface circuit 402 is connected with control signal input CON, the power end VDD of electric level interface circuit 402 is connected with the positive pole of the first led chip group 405, the common potential reference point ground COM of electric level interface circuit 402 is connected with the negative pole of the second led chip group 406, the output of electric level interface circuit 402 is connected with the input of drive circuit 403, the power end VDD of drive circuit 403 is connected with the positive pole of the first led chip group 405, the common potential reference point ground COM of drive circuit 403 is connected with the negative pole of the second led chip group 406, the output of drive circuit 403 is connected with first utmost point of electronic switch 404, second utmost point of electronic switch 404 is connected and is connected with the positive pole of the second led chip group 406 with the negative pole of first led chip group 405 respectively, the common potential reference point ground COM of electronic switch 404 is connected with the negative pole of the second led chip group 406, and the negative pole of the first led chip group 405 is connected with the positive pole of the second led chip group 406; When electronic switch 404 is in cut-off state, the first led chip group 405 and the second led chip group, 406 operate as normal, forward voltage on the first led chip group 405 and the second led chip group 406 provides DC power supply for electric level interface circuit 402 and drive circuit 403, when electronic switch 404 is in conducting state, the first led chip group, 405 operate as normal, the second led chip group 406 is not worked by the electronic switch bypass, and the forward voltage on the first led chip group 405 provides DC power supply for electric level interface circuit 402 and drive circuit 403.

Above-mentioned electronic switch is made up of N ditch metal-oxide-semiconductor, and the drain D of N ditch metal-oxide-semiconductor is connected with the negative pole of the first led chip group 405, and another utmost point source S connects the negative pole of the second led chip group 406, and the 3rd utmost point G connects the output of drive circuit 403.

Above-mentioned ON-OFF control circuit 401 includes some groups, and ON-OFF control circuit 401 becomes some sections LED to exchange the fractional scanning drive circuit with some groups of led chip fabrics in the power-supply circuit 400.Or above-mentioned some groups of ON-OFF control circuit 401 also are connected with fractional scanning control circuit 604, and some groups of ON-OFF control circuit 401 connect and compose some sections LED with fractional scanning control circuit 604 and exchange the fractional scanning drive circuit.

Above-mentioned fractional scanning control circuit 604 is segment encoding scan control circuit or segmentation sequential scanning control circuit.

Above-mentioned two groups of ON-OFF control circuit 401 become four sections LED to exchange the segment encoding scan drive circuit with some groups of led chip fabrics; Four groups of ON-OFF control circuit 401 become 16 sections LED to exchange the fractional scanning drive circuit with some groups of led chip fabrics.

Above-mentioned fractional scanning control circuit 604 also is connected with lightning protection/overvoltage crowbar 601, bridge rectifier 602, voltage sample circuit 603.

The above-mentioned first led chip group 5 and the second led chip group 6 are for being in series with the series LED chipset of some led chips; Or first led chip group 5 and/or the second led chip group 6 also and connect or be serially connected with some led chip groups.

Embodiment 1:

Among the utility model embodiment, ON-OFF control circuit 401 includes electric level interface circuit 402, drive circuit 403, electronic switch 404, electronic switch 404 is N ditch metal-oxide-semiconductor, power-supply circuit 400 includes the first led chip group 405 and the second led chip group 406, electric level interface circuit 402, the power end VDD of drive circuit 403 connects the positive pole of led chip group 405, the drain D of N ditch metal-oxide-semiconductor connects the negative pole of led chip group 405, the source S of N ditch metal-oxide-semiconductor meets the common potential reference point ground COM of switching switch circuit 401, common potential reference point ground COM connects the negative pole of led chip group 406, the positive pole of led chip group 406 is connected with the negative pole of led chip group 405, as shown in Figure 5.

The utility model operation principle: switch controlling signal after electric level interface circuit 402 is finished level conversion, is delivered to drive circuit 403 from CON pin input, control N ditch metal-oxide-semiconductor conducting or end, and N ditch metal-oxide-semiconductor is born switching function; When N ditch metal-oxide-semiconductor ends, led

chip group

405 and 406 conductings simultaneously of led chip group, the electric level interface circuit 402 in the switching switch circuit 401 and the working power of drive circuit 403 are by forward voltage (K+n) xV on led chip group 405 and the led chip group 406 _FProvide; And when the conducting of N ditch metal-oxide-semiconductor, 405 conductings of led chip group, led chip group 406 is bypassed, led chip group 406 do not have electric current by and do not work, at this moment, the working power of electric level interface circuit 402 and drive circuit 403 is by the forward voltage of led chip group 505

Provide, solved the powerup issue of the drive circuit 403 of N ditch metal-oxide-semiconductor conduction period of bearing switching function, realized self-powered function.

Because N ditch metal-oxide-semiconductor driving voltage V _GSGenerally between 2～15V, so led chip group 405 can comprise 1～several led chips, forward voltage (Vf) and the metal-oxide-semiconductor V of concrete quantity K and LED _GS(th) relevant; The led chip number that led chip group 406 comprises is relevant with LED light fixture type of drive, can not wait to dozens of from several.

Embodiment 2:

Utilize three groups of ON-OFF control circuit 401 of the present utility model can constitute eight sections LED shown in the accompanying drawing 6 and exchange the fractional scanning drive circuit, this circuit comprises lightning protection/overvoltage crowbar 601, bridge rectifier 602, voltage sample circuit 603, fractional scanning control circuit 604, three groups of ON-OFF control circuit 401 are respectively first group of ON-OFF control circuit 611, second group of ON-OFF control circuit 621, the 3rd group of ON-OFF control circuit 631, first group of ON-OFF control circuit 611, second group of ON-OFF control circuit 621, the 3rd group of ON-OFF control circuit 631 all includes electric level interface circuit 402, drive circuit 403, electronic switch 404, electronic switch 404 is N ditch metal-oxide-semiconductor T, N ditch metal-oxide-semiconductor T has three utmost points, it is respectively source S, drain D and the 3rd utmost point G, power-supply circuit 400 includes the led chip group of 7 groups of series connection, is respectively the first led chip group 405, the second led chip group 406, the 3rd led chip group 407, the 4th led chip group 408, the 5th led chip group 409, the 6th led chip group 410, the 7th led chip group 411; The positive pole of the 7th led chip group 411 connects+VCC, one utmost point VDD of the drive circuit of first group of ON-OFF control circuit 611 connects the positive pole of the second led chip group 406, the drain D of the electronic switch 403 of first group of ON-OFF control circuit 611 connects the negative pole of the first led chip group 405, the COM utmost point of the electronic switch 403 of first group of ON-OFF control circuit 611 connects the negative pole of the second led chip group 406, and connects the electric level interface circuit 402 of second group of ON-OFF control circuit 621 and the VDD of drive circuit 403; The electric level interface circuit 402 of second group of ON-OFF control circuit 621 is connected the positive pole of the 3rd led chip group 407 with the VDD of drive circuit 403, the drain D of another utmost point electronic switch 403 of second group of ON-OFF control circuit 621 connects the negative pole of the 3rd led chip group 407, second group of ON-OFF control circuit 621 common potential reference point ground COM connect the negative pole of the 4th led chip group 408, and second group of ON-OFF control circuit 621 common potential reference point ground COM connect the electric level interface circuit (402) of the 3rd group of ON-OFF control circuit 631 and the VDD of drive circuit 403; The electric level interface circuit 402 of the 3rd group of ON-OFF control circuit 631 is connected the positive pole of the 5th led chip group 409 with the VDD of drive circuit 403, the drain D of the electronic switch 404 of the 3rd group of ON-OFF control circuit 631 connects the negative pole of the 5th led chip group 409, and the common potential reference point ground COM utmost point of the 3rd group of ON-OFF control circuit 631 connects the negative pole of the 6th led chip group 410; The negative pole of the 6th led chip group 410 connects the positive pole of constant-current source 606, constant-current source 606 minus earths.

As shown in Figure 6, the operation principle of this circuit: after 603 rectifications of alternating current pressuring meridian rectification circuit, obtain output voltage+VCC, + VCC obtains LED and exchanges the required input signal of fractional scanning control circuit 604 after voltage sample circuit 603 step-downs, filtering, and deliver to the input VIN of segment encoding scan control circuit 604, fractional scanning control circuit 604 is controlled the conducting of first group of ON-OFF control circuit 611, second group of ON-OFF control circuit 621, the 3rd group of ON-OFF control circuit 631 successively or is ended according to input voltage value and by CON1, CON2 and CON3.When input voltage less, first group of ON-OFF control circuit 611, second group of ON-OFF control circuit 621, when 631 3 ON-OFF control circuit of the 3rd group of ON-OFF control circuit all are in conducting state, the LED work of led chip group 411, led chip group 405, led chip group 407 and led chip group 409 is luminous, and led chip group 406, led chip group 408 and led chip group 410 are not worked luminous by the electronic switch bypass; When input voltage rises to different value, segment encoding scan control circuit 604 control switch control circuits 611,621 and 631 successively by or conducting, the led chip group 406 that is associated, led chip group 408 and led chip group 410 have energising work accordingly successively or are bypassed and do not work; When first group of ON-OFF control circuit 611, second group of ON-OFF control circuit 621, the 3rd group of ON-OFF control circuit 631 successively by the time, led chip group 406, led chip group 408 and led chip group 410 have electric current to pass through to work luminous accordingly successively; When first group of ON-OFF control circuit 611, second group of ON-OFF control circuit 621, the 3rd group of ON-OFF control circuit 631 conducting successively, led chip group 406, led chip group 408 and led chip group 410 are bypassed successively accordingly and do not work luminous.Can produce eight kinds of combinations by three groups of led chip groups 406, led chip group 408 and led chip group 410, so, eight sections coded scanning circuit can be formed as the led circuit of Fig. 6.

As shown in Figure 6, the led chip quantity m of the led chip group 405 of this circuit is relevant with the alternating voltage size of input.The LED number that all the other LED sections comprise increases progressively by 2 power, comprise P led chip as led chip group 405 and led chip group 406 by ON-OFF control circuit 611 correspondences of CON0 signal controlling, then led chip group 407 and the led chip group 408 by ON-OFF control circuit 621 correspondences of CON1 signal controlling comprises 2xP led chip, comprises 4xP led chip by led chip group 407 and the led chip group 410 of ON-OFF control circuit 631 correspondences of CON2 control.

Embodiment 3:

As shown in Figure 7, this circuit is to use three groups of ON-OFF control circuit of the present utility model to constitute another eight sections LED and exchanges the fractional scanning drive circuit, and this circuit is with the difference of the circuit shown in the accompanying drawing 6: the common potential reference point ground COM of ON-OFF control circuit 611 is not connected with a utmost point VDD of the ON-OFF control circuit 621 of next stage; One utmost point COM of ON-OFF control circuit 621 is not connected with the power end VDD of the ON-OFF control circuit 621 of next stage.All the other operation principles are identical with the circuit shown in the accompanying drawing 6.

Shown in accompanying drawing 6 and accompanying drawing 7, this circuit uses three groups of ON-OFF control circuit to constitute eight sections LED and exchanges the segment encoding scan drive circuit, same principle, two groups of ON-OFF control circuit 401 become four sections LED to exchange the segment encoding scan drive circuit with some groups of led chip fabrics; Four groups of ON-OFF control circuit 401 become 16 sections LED to exchange the segment encoding scan drive circuit with some groups of led chip fabrics.By that analogy.

Embodiment 4:

Accompanying drawing 8 is to realize concrete one of circuit of implementing of the present utility model, ON-OFF control circuit 401 includes electric level interface circuit 402, drive circuit 403, electronic switch 404, wherein electric level interface circuit 402 includes triode T1 and T2 and resistance R 1, R2, R3, R4, drive circuit 403 includes triode T3, T4 and T5 and resistance R 5, R6, electronic switch 404 is N ditch metal-oxide-semiconductor T6, power-supply circuit 400 includes the first led chip group 405 and the second led chip group 406, when switch controlling signal CON input high level, triode T1, the T2 saturation conduction, electric level interface circuit 402 output high level, cause triode T3 saturation conduction, the collector potential of triode T3 descends, make driving stage triode T5 conducting, and triode T4 ends, be drive circuit 403 output low levels, N ditch metal-oxide-semiconductor T6 ends as a result, at this moment triode T2, the maximum voltage that bears between collector electrode-emitter of T4 is the forward voltage of 2+P LED of led chip group 405 and led chip group 406; And when switch controlling signal CON input low level, triode T1, T2 all end, cause triode T3 all to end, the collector potential of triode T3 raises, make driving stage triode T4 conducting, and triode T5 ends, i.e. drive circuit 403 output high level, N ditch metal-oxide-semiconductor T6 conducting as a result, the maximum voltage that bears between collector electrode-emitter of triode T3 is the forward voltage of 2 LED at this moment.

The above-mentioned description that one of preferable case study on implementation of the present utility model is provided is so that those skilled in the art can understand the utility model.Various modifications to these embodiment are apparent to those skilled in the art, can be applied to other embodiment to total principle described here and not possess creativeness.Thereby, the embodiment shown in the utility model will be not limited to here, and should be according to meeting the principle method that discloses and the optimum range of new feature here.

Claims

1. a LED exchanges the switching switch circuit that segmentation drives, it is characterized in that including at least one group of power-supply circuit (400) and ON-OFF control circuit (401), wherein power-supply circuit (400) includes the led chip group of at least two groups series connection, be respectively the first led chip group (405) and the second led chip group (406), ON-OFF control circuit (401) includes electric level interface circuit (402), drive circuit (403), electronic switch (404); Wherein the input of electric level interface circuit (402) is connected with control signal input CON, the power end (VDD) of electric level interface circuit (402) is connected with the positive pole of the first led chip group (405), the common potential reference point ground (COM) of electric level interface circuit (402) is connected with the negative pole of the second led chip group (406), the output of electric level interface circuit (402) is connected with the input of drive circuit (403), the power end VDD of drive circuit (403) is connected with the positive pole of the first led chip group (405), the common potential reference point ground (COM) of drive circuit (403) is connected with the negative pole of the second led chip group (406), the output of drive circuit (403) is connected with first utmost point of electronic switch (404), second utmost point of electronic switch (404) is connected with the negative pole of the first led chip group (405) respectively and is connected with the positive pole of the second led chip group (406), the common potential reference point ground COM of electronic switch (404) is connected with the negative pole of the second led chip group (406), and the negative pole of the first led chip group (405) is connected with the positive pole of the second led chip group (406); When electronic switch (404) when being in cut-off state, the first led chip group (405) and second led chip group (406) operate as normal, the forward voltage on the first led chip group (405) and the second led chip group (406) provide DC power supply for electric level interface circuit (402) and drive circuit (403); When electronic switch (404) when being in conducting state, first led chip group (405) operate as normal, the second led chip group (406) is not had forward voltage by electronic switch (404) bypass, and the forward voltage on the first led chip group (405) provides DC power supply for electric level interface circuit (402) and drive circuit (403).

2. LED according to claim 1 exchanges the switching switch circuit that segmentation drives, and it is characterized in that above-mentioned electric level interface circuit (402) and drive circuit (403) be made up of photoelectric coupled device.

3. LED according to claim 1 exchanges the switching switch circuit that segmentation drives, it is characterized in that above-mentioned electronic switch is made up of N ditch metal-oxide-semiconductor, drain electrode (D) utmost point of N ditch metal-oxide-semiconductor connects the negative pole of the first led chip group (405), another utmost point source electrode (S) connects the negative pole of the second led chip group (406), and the 3rd utmost point (G) connects the output of drive circuit (403).

4. exchange the switching switch circuit that segmentation drives according to each described LED of claim 1 to 3, it is characterized in that above-mentioned ON-OFF control circuit (401) includes some groups, ON-OFF control circuit (401) becomes some sections LED to exchange the fractional scanning drive circuit with some groups of led chip fabrics in the power-supply circuit (400).

5. LED according to claim 4 exchanges the switching switch circuit that segmentation drives, it is characterized in that above-mentioned some groups of ON-OFF control circuit (401) also are connected with fractional scanning control circuit (604), some groups of ON-OFF control circuit (401) connect and compose some sections LED with fractional scanning control circuit (604) and exchange the fractional scanning drive circuit.

6. LED according to claim 5 exchanges the switching switch circuit that segmentation drives, and it is characterized in that above-mentioned fractional scanning control circuit (604) is segment encoding scan control circuit or segmentation sequential scanning control circuit.

7. LED according to claim 6 exchanges the switching switch circuit that segmentation drives, it is characterized in that above-mentioned three groups of ON-OFF control circuit (401) and fractional scanning control circuit (604) can constitute eight sections LED and exchange the segment encoding scan drive circuit, three groups of ON-OFF control circuit (401) are respectively first group of ON-OFF control circuit (611), second group of ON-OFF control circuit (621), the 3rd group of ON-OFF control circuit (631), first group of ON-OFF control circuit (611), second group of ON-OFF control circuit (621), the 3rd group of ON-OFF control circuit (631) all includes electric level interface circuit (402), drive circuit (403), electronic switch (404), electronic switch (404) is N ditch metal-oxide-semiconductor T, N ditch metal-oxide-semiconductor T has three utmost points, it is respectively source S, drain D and the 3rd utmost point G, power-supply circuit (400) includes the led chip group of 7 groups of series connection, is respectively the first led chip group (405), the second led chip group (406), the 3rd led chip group (407), the 4th led chip group (408), the 5th led chip group (409), the 6th led chip group (410), the 7th led chip group (411); The positive pole of the 7th led chip group (411) connects+VCC, one utmost point VDD of the drive circuit of first group of ON-OFF control circuit (611) connects the positive pole of the second led chip group 406, the drain D of the electronic switch (404) of first group of ON-OFF control circuit (611) connects the negative pole of the first led chip group (405), the COM utmost point of the electronic switch of first group of ON-OFF control circuit 611 (404) connects the negative pole of the second led chip group (406), and connects the electric level interface circuit (402) of second group of ON-OFF control circuit (621) and the power end VDD of drive circuit (403); The electric level interface circuit (402) of second group of ON-OFF control circuit (621) is connected the positive pole of the 3rd led chip group (407) with the power end VDD of drive circuit (403), the drain D of the electronic switch (404) of second group of ON-OFF control circuit (621) connects the negative pole of the 3rd led chip group (407), the common potential reference point ground COM of second group of ON-OFF control circuit (621) connects the negative pole of the 4th led chip group (408), and the common potential reference point of second group of ON-OFF control circuit (621) ground COM connects the electric level interface circuit (402) of the 3rd group of ON-OFF control circuit (631) and the power end VDD of drive circuit (403); The electric level interface circuit (402) of the 3rd group of ON-OFF control circuit (631) is connected the positive pole of the 5th led chip group (409) with the power end VDD of drive circuit (403), the drain D of the electronic switch (404) of the 3rd group of ON-OFF control circuit (631) connects the negative pole of the 5th led chip group (409), and the common potential reference point ground COM utmost point of the 3rd group of ON-OFF control circuit (631) connects the negative pole of the 6th led chip group (410); The negative pole of the 6th led chip group (410) connects the positive pole of constant-current source (606).

8. LED according to claim 5 exchanges the switching switch circuit that segmentation drives, and it is characterized in that above-mentioned two groups of ON-OFF control circuit (401) and some groups of led chip fabrics become four sections LED to exchange the segment encoding scan drive circuit; Four groups of ON-OFF control circuit (401) become 16 sections LED to exchange the segment encoding scan drive circuit with some groups of led chip fabrics.

9. LED according to claim 5 exchanges the switching switch circuit that segmentation drives, and it is characterized in that above-mentioned fractional scanning control circuit (604) also is connected with bridge rectifier (602), voltage sample circuit (603).

10. LED according to claim 5 exchanges the control circuit that drives, and it is characterized in that the above-mentioned first led chip group (5) and the second led chip group (6) are for being in series with the series LED chipset of some led chips; Or first led chip group (5) and/or the second led chip group (6) also and connect or be serially connected with some led chip groups.