CN103206684B - Sectional type LED (Light-Emitting Diode) driving device and driving method and LED illuminating device thereof - Google Patents

Sectional type LED (Light-Emitting Diode) driving device and driving method and LED illuminating device thereof Download PDF

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CN103206684B
CN103206684B CN201310143052.XA CN201310143052A CN103206684B CN 103206684 B CN103206684 B CN 103206684B CN 201310143052 A CN201310143052 A CN 201310143052A CN 103206684 B CN103206684 B CN 103206684B
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led
switch
group
led string
led group
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CN103206684A (en
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陈小雨
张静
陈博
邓迅生
麦炎全
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SHENZHEN SHENDIE SEMICONDUCTOR CO Ltd
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SHENZHEN SHENDIE SEMICONDUCTOR CO Ltd
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Abstract

The invention discloses a sectional type LED (Light-Emitting Diode) driving device and a driving method and an LED illuminating device thereof. The sectional type LED driving device is connected with a rectifier bridge, an LED lamp string and an LED lamp group, and comprises an LED lamp string switch block, an LED lamp group switch block, a current detection and correction unit and a control logic unit, wherein the LED lamp string switch block is used for switching on or off LEDs in the LED lamp string; the LED lamp group switch block is used for switching on or off LEDs in the LED lamp group; the current detection and correction unit is used for detecting the current change of the LEDs; and the control logic unit is used for controlling the on and off of the LED lamp string switch block and the LED lamp group switch block according to a detection result of the current detection and correction unit. After a mains supply is rectified, the LEDs are driven by the LED driving device directly without the need of an inductor and an electrolytic capacitor, so that the stability of the system can be improved; in addition, the on and off states of the LEDs in the LED lamp string and the LED lamp group can also be regulated in real time according to the size of the rectifier bridge, so that the efficiency of the LED driving device can be greatly improved.

Description

Segmented LED drive device and driving method thereof and LED light device
Technical field
The present invention relates to LED illumination technology, particularly a kind of segmented LED drive device and driving method thereof and LED light device.
Background technology
In traditional LED drive circuit, civil power becomes after direct current through rectifier bridge, generally also needing to carry out process through inductance and electrochemical capacitor device carrys out driving LED, but the life-span of electrochemical capacitor is shorter, seriously constrain the bulk life time of LED drive circuit, and conversion efficiency is generally about 80%, its conversion efficiency is low, has had a strong impact on the illuminating effect of LED like this.
In order to avoid using inductance and electric capacity in the driving circuit, designer has carried out some to LED drive circuit and has improved, as shown in Figure 1, it is the circuit diagram of the patent of CN 102196627 for publication number, in that patent, metal-oxide-semiconductor 88,87,86, for short circuit or the short string of open circuit LED 62, the short string of LED 61, the short string 60 of LED.For metal-oxide-semiconductor 87, when the short string 61 of metal-oxide-semiconductor 87 short circuit LED, the voltage between L3 and L4 is close to zero; When metal-oxide-semiconductor 87 opens a way the short string 61 of LED, the voltage to be 16N × 3.0V(3.0V be single led two ends when being on state of of the voltage between L3 and L4).Suppose that mains input voltage is 220V, ceiling voltage 220 × 1.414=311V that the pressure drop when all LED light on LED should export close to rectifier bridge, the total quantity of visible LED should be about 100, so N is at least 2.So when metal-oxide-semiconductor 87 opens a way the short string 61 of LED, the voltage between L3 and L4 is 16N × 3.0V>16 × 2 × 3.0V=96V.If when all LED are all on state of, the voltage 15 × 3.0V=45.0V on L3 ground.
Can learn from analysis above, Source (being connected on L3) the minimum withstand voltage 45V over the ground of metal-oxide-semiconductor 87, Drain (being connected on L4) the minimum withstand voltage 45+96=141V over the ground of metal-oxide-semiconductor 87, and the minimum withstand voltage that Drain and Source of standard metal-oxide-semiconductor 87 holds is 96V.Simultaneously the gate(of metal-oxide-semiconductor 87 is connected on NG4) drive circuit is also very complicated.In existing semiconductor technology, this MOS can not be integrated.Therefore the circuit structure of above-mentioned drive circuit is complicated especially, higher to the requirement of withstand voltage of device, is difficult at a core Embedded, does not meet the day by day microminiaturized requirement of electronic product.
As shown in Figure 2, it is the circuit diagram of the patent of US 2011/0084619A1 for publication number, and the description according to its claim 2 can be learnt, patent 2 is by AC synchronous circuit, at the LED string that different moment gatings is different, and according to the electric current in Timing LED string.When driving LED, make that 12B turns off, 12C opens at regular hour point, when 12C opens, the quantity of LED increases, and the electric current simultaneously in LED increases.But in the moment that 12B turns off, the Drain terminal voltage of 122 in 12B will be very high, and the total quantity being about 11A and 11B lamp is multiplied by 3.0V, the electric current in usual LED is 30mA or higher.Suppose that the lamp quantity in 11a and 11b is 30, the power consumption so on chip is 30 × 3.0V × 30mA=2700mW, and for conventional 7W LED illumination System, its efficiency will be less than 80%.Power consumption simultaneously on chip is 2.7W, proposes higher requirement also can to the encapsulation of chip.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of segmented LED drive device and driving method thereof and LED light device, to solve prior art circuits complex structure, the problem that conversion efficiency is low.
In order to achieve the above object, this invention takes following technical scheme:
A kind of segmented LED drive device, it is connected with rectifier bridge, LED string and LED group, and for lighting or extinguishing the LED in LED string and LED group, it comprises: LED string switch group, for lighting or extinguishing the LED in LED string; LED group switches set, for lighting or extinguishing the LED in LED group; Current detecting and error correction unit, for detecting the curent change of LED; Control logic unit, for controlling LED string switch group and the open and close of LED group switches set according to the testing result of current detecting and error correction unit;
The positive output end of described rectifier bridge connects the positive pole of LED string, the negative output terminal ground connection of rectifier bridge; The negative pole of described LED string connects the first end of LED string switch group; Second end connection control logical block of LED string switch group, the first end of three-terminal link LED group switches set of LED string switch group and the positive pole of LED group; Second end connection control logical block of described LED group switches set, the negative pole of three-terminal link LED group of LED group switches set and the first end of current detecting and error correction unit; Second end connection control logical block of described current detecting and error correction unit, the 3rd end ground connection of current detecting and error correction unit.
A driving method for above-mentioned segmented LED drive device, comprising:
Control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the open/close states of the first LED string switch, the first LED group switch, regulate the quantity being in the LED of illuminating state, make LED current be between undercurrent value and overcurrent value; Wherein:
When rectifier bridge output voltage is the highest, control logic unit controls first LED string switch is opened, and the first LED group switch OFF, makes the first LED string and the first LED group be in illuminating state; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, and control logic unit controls controls the first LED group switch open, extinguishes the LED in the first LED group, makes LED current increase be greater than floor level of electric current;
When rectifier bridge output voltage is minimum, control logic unit controls first LED string switch and the first LED group switch are all opened, and make the first LED group be in illuminating state; When rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the first LED group switch OFF, lights the LED in the first LED group, LED current is reduced and is less than upper current limit value;
After system initially powers on, control the first LED string switch and open and the first LED group switch OFF, make the first LED string and the first LED group access between rectifier bridge and ground; Afterwards, control mode when reducing according to rectifier bridge output voltage, controls the open/close states of the first LED group switch and the first LED group switch, makes LED current between undercurrent value and overcurrent value; Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt LED current in rising or the control mode of decline stage, control the open/close states of the first LED group switch and the first LED group switch, regulate the quantity of the LED of illuminating state.
A driving method for above-mentioned segmented LED drive device, comprising:
Control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the open/close states of the second LED string switch, the 3rd LED string switch, the 4th LED string switch, the 5th LED string switch, the second LED group switch, the 3rd LED group switch, regulate the quantity being in the LED of illuminating state, LED current is made to be between undercurrent value and overcurrent value, wherein:
When rectifier bridge output voltage is the highest, control logic unit controls controls the 5th LED string switch unlatching, the second LED group switch and the 3rd LED group switch OFF, light the second LED string, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group, the output voltage of described rectifier bridge is from the highest reduction, when LED current reduction is less than undercurrent value, control the 3rd LED group switch open, extinguish the 3rd LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduces, when LED current continuation reduction is less than undercurrent value, controls the second LED group switch open, extinguish the second LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage continues to reduce, when LED current continuation reduction is less than undercurrent value, control the 5th LED string switch, the second LED group switch and the 3rd LED group switch OFF, control the 4th LED string switch to open simultaneously, extinguish the 5th LED string and light the second LED group and the 3rd LED group; Along with rectifier bridge output voltage continues to reduce, when LED current reduction is less than undercurrent value, control the 3rd LED group switch open, extinguish the 3rd LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage continues to reduce, when LED current continuation reduction is less than undercurrent value, control the second LED group switch open, continue extinguishing second LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduces, when LED current continuation reduction is less than undercurrent value, control the 4th LED string switch, the second LED group switch and the 3rd LED group switch OFF, control the 3rd LED string switch to open simultaneously, extinguish the 4th LED string and light the second LED group and the 3rd LED group, then LED current increase is greater than undercurrent value; By that analogy, until when rectifier bridge output voltage is down to minimum, control the second LED string switch, the second LED group switch and the 3rd LED group switch open, control the 3rd LED string switch, the 4th LED string switch, the 5th LED string switch shutoff simultaneously, make the second LED string be illuminating state, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group are OFF state;
When rectifier bridge output voltage is minimum, control logic unit controls controls the 5th LED string switch, the second LED group switch and the 3rd LED group switch and all opens, and only lights the second LED group, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch OFF and lights the 3rd LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the 3rd LED string switch, the second LED group switch and the 3rd LED group switch open, control the second LED string switch to turn off simultaneously, light the 3rd LED string and extinguish the second LED group and the 3rd LED group, LED current being reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the second LED group switch OFF, lights the second LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch OFF, lights the 3rd LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the 4th LED string switch, second LED group switch and the 3rd LED group switch open, control the 3rd LED string switch to turn off simultaneously, light the 4th LED string, and extinguish the second LED group and the 3rd LED group, LED current is reduced and is less than overcurrent value, by that analogy, until when rectifier bridge voltage is raised to the highest, control the 5th LED string switch to open, control the second LED string switch, 3rd LED string switch, 4th LED string switch, second LED group switch and the 3rd LED group switch OFF, light the second LED string, 3rd LED string, 4th LED string, 5th LED string, second LED group and the 3rd LED group,
After system initially powers on, control the 5th LED string switch to open, control the second LED string switch, the 3rd LED string switch, the 4th LED string switch, the second LED group switch and the 3rd LED group switch OFF simultaneously, make the second LED string, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group access between rectifier bridge and ground; Afterwards, the undercurrent exported according to current detecting and error correction circuit and over-current signal, according to the mode of rectifier bridge output voltage decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch and second, third LED group switch, make LED drive device under the voltage initially powered on, LED current is between undercurrent value and overcurrent value; Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt and rise or the control mode of decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch and second, third LED group switch, regulate the quantity of the LED of illuminating state.
A driving method for above-mentioned segmented LED drive device, comprising:
Control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the 6th LED string switch, the 7th LED string switch, the 8th LED string switch, the 9th LED string switch, the 4th LED group switch, the 5th LED group switch, regulate the quantity being in the LED of illuminating state, LED current is made to be between undercurrent value and overcurrent value, wherein:
When rectifier bridge output voltage is the highest, control logic unit controls the 8th LED string switch, the 9th LED string switch are opened, control the 6th LED string switch, the 7th LED string switch, the 4th LED group switch and the 5th LED group switch OFF, light the 6th LED string, the 7th LED string, the 4th LED group and the 5th LED group; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 5th LED group switch open, extinguishes the 5th LED group and extinguishes, make LED current increase be greater than undercurrent value; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 4th LED group switch open, and extinguish the 4th LED group, LED current increase is greater than undercurrent value; Along with rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, control the 6th LED string switch and the unlatching of the 7th LED string switch, control the 8th LED string switch, the 9th LED string switch, the 4th LED group switch and the 5th LED group switch OFF simultaneously, extinguish the 7th LED string, light the 4th LED group and the 5th LED group, make LED current increase be greater than undercurrent value; Along with LED current continues to reduce, control the 5th LED group switch open, extinguish the 5th LED group; Along with rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 4th LED group switch open, and continue extinguishing the 4th LED group, LED current increase is greater than undercurrent value;
When rectifier bridge output voltage is minimum, control logic unit controls the 8th LED string switch, the 9th LED string switch turn off, 6th LED string switch, the 7th LED string switch, the 4th LED group switch, the 5th LED group switch open, light the 7th LED string; Along with rectifier bridge output voltage raises, LED current raises rising and is greater than overcurrent value, controls the 4th LED group switch OFF, lights the 4th LED group; Along with LED current continues to raise, control the 5th LED group switch OFF, continue to light the 5th LED group, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 8th LED string switch, the 9th LED string switch, the 4th LED group switch and the 5th LED group switch open, control the 6th LED string switch simultaneously, the 7th LED string switch turns off, light the 7th LED string, extinguish the 4th LED group and the 5th LED group simultaneously, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 4th LED string switch and turns off, light the 4th LED group, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 5th LED string switch and turns off, continue to light the 5th LED group, and LED current minimizing is less than overcurrent value;
After system initially powers on, control the 8th LED string switch, the 9th LED string switch is opened, 6th LED string switch, the 7th LED string switch, the 4th LED group switch and the 5th LED group switch OFF, make the 6th LED string, the 7th LED string, the 4th LED group and the 5th LED group, between access rectifier bridge and ground; Afterwards, the undercurrent exported according to current detecting and error correction circuit and over-current signal, according to the control mode of rectifier bridge output voltage decline stage, control the open/close states of the 6th, the 7th, the 8th, the 9th LED string switch and the 4th, the 5th LED group switch, make under the voltage initially powered on, LED current is between undercurrent value and overcurrent value; Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt and rise or the control mode of decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch and second, third LED group switch, regulate the quantity of the LED of illuminating state.
A kind of LED light device, it comprises: for carrying out the rectifier bridge of rectification, LED string, LED group and above-mentioned segmented LED drive device to input signal; Described rectifier bridge connects LED string and LED group by segmented LED drive device.
Compared to prior art, segmented LED drive device provided by the invention and driving method thereof and LED light device, at civil power after over commutation, directly by LED drive device driving LED, do not need to use inductance and electrochemical capacitor, save material cost, improve the stability of system; Regulated the light on and off state of the LED in LED string and LED group simultaneously by LED drive device according to rectifier bridge size in real time, substantially increase the efficiency of LED drive device.
Accompanying drawing explanation
The circuit diagram of Fig. 1 to be publication number be patent of CN 102196627.
The circuit diagram of Fig. 2 to be publication number be patent of US 2011/0084619A1.
Fig. 3 is the circuit structure block diagram of segmented LED drive device of the present invention.
The circuit structure block diagram of the segmented LED drive device that Fig. 4 provides for the present invention first preferred embodiment.
The circuit theory diagrams of the segmented LED drive device that Fig. 5 provides for the present invention first preferred embodiment.
The circuit structure block diagram of the segmented LED drive device that Fig. 6 provides for the present invention second preferred embodiment.
The circuit structure block diagram of the segmented LED drive device that Fig. 7 provides for the present invention the 3rd preferred embodiment.
Detailed description of the invention
The invention provides a kind of segmented LED drive device and driving method thereof and LED light device, according to the change of LED current the lighting and extinguish quantity of control LED in real time, thus improve the efficiency of drive unit.
For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Segmented LED drive device provided by the invention connects rectifier bridge, LED string and LED group, for according to rectifier bridge output voltage amplitude, lights or extinguishes the LED in LED string and LED group, thus improving the efficiency of LED drive device.Refer to Fig. 3, it is the circuit structure block diagram of segmented LED drive device of the present invention.As shown in Figure 3, segmented LED drive device can be designed as a kind of LED drive chip to reduce the complexity of lighting circuit, the part gone out as thick dashed line circle in Fig. 3 represents segmented LED drive device, and it comprises: LED string switch group 400, LED group switches set 500, current detecting and error correction unit 600 and control logic unit 700.In LED string 200 and LED group 300, be made up of plurality of LEDs chip-in series, LED string 200 and LED group 300 LED load in series, this LED load is connected between rectifier bridge 100 positive output end and ground.
In the present embodiment, the positive output end of described rectifier bridge 100 connects the positive pole of LED string 200, the negative output terminal ground connection of rectifier bridge 100, for carrying out rectification to the alternating current of input; The negative pole of described LED string 200 connects the first end A1 of LED string switch group 400; Second end A2 connection control logical block 700 of LED string switch group 400,3rd end A3 of LED string switch group 400 connects the first end B1 of LED group switches set 500 and the positive pole of LED group 300, for accepting the control of control logic unit 700, lighting or extinguishing the LED in LED string 200; Second end B2 connection control logical block 700 of described LED group switches set 500,3rd end B3 of LED group switches set 500 connects the negative pole of LED group 300 and the first end C1 of current detecting and error correction unit 600, for accepting the control of control logic unit 700, lighting or extinguishing the LED in LED group 300.
Second end C2 connection control logical block 700 of described current detecting and error correction unit 600, 3rd end C3 ground connection of current detecting and error correction unit 600, this current detecting and error correction unit 600 are connected on the end of LED group 300, detect the curent change of LED, judge undercurrent and over-current state, undercurrent signal or over-current signal effective time, export a signal to control logic unit 700, by the testing result of control logic unit 700 according to current detecting and error correction unit 600, and the height of rectifier bridge output voltage controls LED string switch group 400 and LED group switches set 500 opens and closes.
Open when control logic unit 700 controls LED string switch group 400, light the LED string 200 be connected between LED string switch group 400 first end A1 and the positive output end of rectifier bridge 100; When control logic unit 700 control LED group switches set 500 open time, extinguish the LED group 300 in parallel with it; When LED group switches set 500 turns off, light the LED group 300 in parallel with it.The present invention detects the change (i.e. the change of LED current) of the LED current in LED string 200 or LED group 300 electric current according to current detecting and error correction unit 600, the open and close state of LED string switch group 400 and LED group switches set 500 is controlled in real time according to the change of electric current, the LED of corresponding control LED string 200 or LED group 300 lights quantity, improves drive efficiency.
According to above-mentioned segmented LED drive device, correspondence of the present invention provides three preferred embodiments to be described in detail to technical scheme of the present invention, refers to Fig. 4, is the circuit structure block diagram of the segmented LED drive device that the present invention first preferred embodiment provides.
As shown in Figure 4, described segmented LED drive device also comprises the power supply unit 800 for powering; Wherein: described LED string 200, LED group 300, LED string switch group 400 and LED group switches set 500 are respectively one, in the present embodiment, be respectively: the first LED string 201, first LED group 301, first LED string switch 401 and the first LED group switch 501.Wherein, the LED quantity in the first LED group 301 is less than the quantity of the LED in the first LED string 201, and more excellent configuration is the quantity of LED in the first LED group 301 is 1/2 of LED quantity in the first LED string 201.
One end of described power supply unit 800 connects the positive output end of rectifier bridge 100 and the positive pole of the first LED string 201, and the other end of power supply unit 800 connects the 4th end A14 of the first LED string switch 401, provides supply voltage for giving the first LED string switch 401, the negative pole of described first LED string 201 connects the first end A11 of the first LED string switch 401, the G1 end of the second end A12 connection control logical block 700 of the first LED string switch 401, the control signal exported for accepting control logic unit 700 controls the first LED string 201 and lights and extinguishing, 3rd end A13 of described first LED string switch 401 connects the first end B11 of the first LED group switch 501 and the positive pole of the first LED group 301, the PG1 end of the second end B12 connection control logical block 700 of described first LED group switch 501, 3rd end B13 of the first LED group switch 501 connects the negative pole of the first LED group 301, the control signal exported for accepting control logic unit 700 controls the first LED group 301 and lights and extinguishing, 3rd end of the first LED group switch 501 also connects the first end C1 of current detecting and error correction unit 600, namely this current detecting and error correction unit 600 are connected on the end (negative pole) of the first LED group 301 and the 3rd end B13 of the first LED group switch 501, when the first LED group 301 is lighted, it is for detecting the LED current in the first LED group 301, when the first LED group 301 is extinguished, it is for detecting the LED current in the first LED string 201.
Described control logic unit 700 is for the height according to rectifier bridge 100 output voltage, control the light on and off state of the first LED string 201 and the first LED group 301, make the magnitude of voltage sum being on state of LED, almost consistent with rectifier bridge 100 output voltage, thus the power-efficient improved.
Its control method is specially: control logic unit 700 is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the open/close states of the first LED string switch 401, first LED group switch 501, regulate the quantity being in the LED of illuminating state, make LED current be between undercurrent value and overcurrent value, the output voltage being in the VF value sum of illuminating state LED and rectifier bridge is like this close.
When rectifier bridge output voltage is the highest, control logic unit 700 controls the first LED string switch 401 and opens, and the first LED group switch 501 turns off, and makes the first LED string 201 and the first LED group 301 be in illuminating state; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, and control logic unit 700 control first LED group switch 501 is opened, and extinguishes the LED in the first LED group 301, makes LED current increase be greater than floor level of electric current.
When rectifier bridge output voltage is minimum, control logic unit 700 controls the first LED string switch 401 and the first LED group switch 501 is all opened, and makes the first LED group 301 be in illuminating state; When rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the first LED group switch 501 and turns off, light the LED in the first LED group 301, LED current is reduced and is less than upper current limit value.
After system initially powers on, control first LED string switch 401 open and the first LED group switch 501 turn off, make the first LED string 201 and the first LED group 301 access between rectifier bridge and ground; Afterwards, control mode when reducing according to rectifier bridge output voltage, controls the open/close states of the first LED group switch 501 and the first LED group switch 501, makes LED current between undercurrent value and overcurrent value; Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt LED current in rising or the control mode of decline stage, control the open/close states of the first LED group switch 501 and the first LED group switch 501, regulate the quantity of the LED of illuminating state.
According to above-mentioned analysis, when there is undercurrent, the truth table of the light on and off State Transferring of the first LED string 201 and the first LED group 301 is as shown in table 1, wherein Q1_n-1 and Q1_n represents current state and the NextState of the first LED string 201, Qf1_n-1 and Qf1_n represents current state and the NextState of the first LED group 301.
Undercurrent signal Q1_n-1 Qf1_n-1 Q1_n Qf1_n
1 1 1 1 0
1 1 0 1 0
Table 1
In Table 1, when undercurrent signal is 1, indicate undercurrent signal, now need the quantity reducing the LED lighted, otherwise keep current state.When Q1 and Qf is 1, indication lamp is bright, and when Q1 and Qf is 0, indication lamp goes out.
Then represent that rectifier bridge output voltage has been down to minimum when only having the first LED string 201 to light, when rectifier bridge output voltage raises, electric current in LED will increase, when LED current is greater than overcurrent value, control the first LED group switch 501 to turn off, keep the first LED string switch 401 to be opening, light the LED in the first LED group 301, the first LED string 201 and the first LED group 301 is made to be illuminating state, by increasing the quantity lighting LED, LED current being reduced and is less than overcurrent value.In like manner during known generation overcurrent, the true value of the first LED string 201 and the first LED group 301 is as shown in table 2:
Over-current signal Q1_n-1 Qf1_n-1 Q1_n Qf1_n
1 1 0 1 1
1 1 1 1 １
Table 2
In table 2, when over-current signal is 1, indicate over-current signal, now need the quantity increasing the LED lighted, otherwise keep current state.
See also Fig. 5, in the specific implementation, described first LED string switch 401 comprises: the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6, the 8th metal-oxide-semiconductor M8 and diode D1.
Wherein, the drain electrode of described first metal-oxide-semiconductor M1 connects the negative pole of the first LED string 201, the source electrode of the first metal-oxide-semiconductor M1 is connected the first end B11 of the first LED group switch 501 with the source electrode of the 8th metal-oxide-semiconductor M8, the grid of the first metal-oxide-semiconductor M1 connects the drain electrode of the 6th metal-oxide-semiconductor M6 and the drain electrode of the 8th metal-oxide-semiconductor M8, the source electrode of the 6th metal-oxide-semiconductor M6 is connected power supply unit 800 with the source electrode of the 5th metal-oxide-semiconductor M5, and the drain electrode of the 5th metal-oxide-semiconductor M5 connects the grid of the 6th metal-oxide-semiconductor M6 and the grid of the 4th metal-oxide-semiconductor M4; The G1 end of the grid of the 5th metal-oxide-semiconductor M5 and the grid connection control logical block 700 of the 8th metal-oxide-semiconductor M8; The source electrode of the 4th metal-oxide-semiconductor M4 connects power supply unit 800; The drain electrode of the 4th metal-oxide-semiconductor M4 connects the drain electrode of the 3rd metal-oxide-semiconductor M3, the G1 end of the grid connection control logical block 700 of the 3rd metal-oxide-semiconductor M3, the source electrode of the 3rd metal-oxide-semiconductor M3 connects the drain electrode of the second metal-oxide-semiconductor M2, and the grid of the second metal-oxide-semiconductor M2 connects bias voltage source, the source ground of the second metal-oxide-semiconductor M2; The positive pole of described diode D1 connects the source electrode of described first metal-oxide-semiconductor M1 and the source electrode of the 8th metal-oxide-semiconductor M8, and the negative pole of diode D1 connects the grid of the first metal-oxide-semiconductor M1 and the drain electrode of the 8th metal-oxide-semiconductor M8.
In the embodiment of the present invention, described diode D1 is Zener diode, first metal-oxide-semiconductor M1 is the high-pressure N-shaped LDMOS(LDMOS of isolated form), power supply unit 800 receives rectifier bridge 100 and outputs signal, and produces power supply and uses to the first LED string switch 401.
Described diode D1 is by the breakdown reverse voltage of the Vgs voltage clamping of the first metal-oxide-semiconductor M1 at diode D1, and it is about 6V.Second metal-oxide-semiconductor M2 forms tail current source, when G1 is high level, 3rd metal-oxide-semiconductor M3 opens, 4th metal-oxide-semiconductor M4 and the 5th metal-oxide-semiconductor M5 forms current mirroring circuit, electric current in final 5th metal-oxide-semiconductor M5 flows through diode D1, the Vgs of the first metal-oxide-semiconductor M1 is maintained about 6V, thus the first metal-oxide-semiconductor M1 is in opening; When G1 is low level, the 8th metal-oxide-semiconductor M8 opens, the Gate(grid by the first metal-oxide-semiconductor M1) and Source(source electrode) by the 8th metal-oxide-semiconductor M8 short circuit together, thus make the first metal-oxide-semiconductor M1 be in off state.First metal-oxide-semiconductor M1 is when turning off, and the ceiling voltage of its Drain end (drain electrode end) is the voltage after civil power (alternating current) rectification, and it is withstand voltage is about 450V; When the first metal-oxide-semiconductor M1 conducting, the voltage of itself Source and Bulk end (substrate) is the forward voltage of the first LED group 301; The forward voltage of LED group 300 is made to control at about 40V by the quantity controlling the LED in LED group 300; So the first metal-oxide-semiconductor M1 its Source/Bulk voltage to the first metal-oxide-semiconductor M1 substrate when conducting is about 40V, be a kind of can meet above-mentioned two kinds of conditions of work under withstand voltage components and parts, thus can be integrated at chip internal, namely, when segmented LED drive device makes one piece of LED drive chip, above-mentioned metal-oxide-semiconductor can be integrated in LED drive chip.
Please continue to refer to Fig. 4 and Fig. 5, described first LED group switch 501 comprises the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10, the 11 metal-oxide-semiconductor M11 and resistance R1.The source electrode of described 9th metal-oxide-semiconductor M9 connects the source electrode of the first metal-oxide-semiconductor M1 and the positive pole of the first LED group 301, the drain electrode of the 9th metal-oxide-semiconductor M9 connects current detecting and the first end C1 of error correction unit 600 and the negative pole of the first LED group 301, and the grid of the 9th metal-oxide-semiconductor M9 connects the drain electrode of the tenth metal-oxide-semiconductor M10, also connects the source electrode of the first metal-oxide-semiconductor M1 and the source electrode of the 9th metal-oxide-semiconductor M9 by described resistance R1; The PG1 end of the grid connection control logical block 700 of described tenth metal-oxide-semiconductor M10, the source electrode of the tenth metal-oxide-semiconductor M10 connects the drain electrode of the 11 metal-oxide-semiconductor M11; The grid of the 11 metal-oxide-semiconductor M11 connects bias DC voltage source, the source ground of the 11 metal-oxide-semiconductor M11.
Wherein, 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10 and the 11 metal-oxide-semiconductor M11 are middle pressure pipe, as long as the highest withstand voltage satisfied with the first LED group 301 in parallel with it, due to the negligible amounts of LED in the first LED group 301, consider the restriction of semiconductor process, the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10 and the 11 the withstand voltage of metal-oxide-semiconductor M11 are set to about 60V by the present embodiment simultaneously.In the first LED group switch 501, the 11 metal-oxide-semiconductor M11 is tail current source, when PG1 end is for high level, tenth metal-oxide-semiconductor M10 conducting, current flowing resistance R1, thus the Vgs of the 9th metal-oxide-semiconductor M9 is dropped to about-5V, now the 9th metal-oxide-semiconductor M9 is in conducting state; When PG1 end is low level, the Gate of the 9th metal-oxide-semiconductor M9 is pulled upward to the current potential same with Source, makes the 9th metal-oxide-semiconductor M9 be in cut-off state.
Please again consult Fig. 4 and Fig. 5, described current detecting and error correction unit 600 comprise: the first comparator V1, the second comparator V2, the 3rd comparator V3, the 4th comparator V4, with door G1, nor gate G2 and rheostat R2; The in-phase input end of the in-phase input end of described first comparator V1, the in-phase input end of the second comparator V2, the 3rd comparator V3 is connected the negative pole of the first LED group 301 and one end of rheostat R2 with the in-phase input end of the 4th comparator V4, bias voltage Vref_h1, Vref_h2, Vref_l1, Vref_l2 that the inverting input of the inverting input of the first comparator V1, the inverting input of the second comparator V2, the 3rd comparator V3 is different with the anti-phase input termination of the 4th comparator V4, the other end ground connection of rheostat R2; The SEL end of the resistor tap connection control logical block 700 of described rheostat R2; Control logic unit 700 exports the different sampling resistor tap of SEL signal behavior, and when the position of resistor tap is higher, then the threshold value detecting electric current is lower; In like manner, the position of resistor tap is lower, then the threshold value detecting electric current is higher, thus control logic unit 700 can regulate the electric current flowing through LED.
Please again consult Fig. 5, the output of the first comparator V1 connects the first input end with door G1, and the output of the second comparator V2 connects the second input with door G1, holds with the OV_H of the output connection control logical block 700 of door G1.In the present embodiment, the first comparator V1, the second comparator V2 and form over-current detection circuit with door G1, and Vrefh_1 is than Vrehf_2 height 50mV, when the sampled voltage obtaining rheostat R2 than Vrefh _ 1 and Vrefh_2 all high time, represent that over-current signal is effective;
The output of described 3rd comparator V3 connects the first input end of nor gate G2, and the output of the 4th comparator V4 connects second input of nor gate G2, the OV_L end of the output connection control logical block 700 of nor gate G2.In the present embodiment, the 3rd comparator V3 and the 4th comparator V4 and nor gate G2 forms undercurrent testing circuit, and Vrefl_1 is than Vrefl_2 height 50mV, when the sampled voltage obtaining rheostat R2 is all lower than Vrefl_1 and Vrefl_2, represents that undercurrent signal is effective.Refer to Fig. 6, the circuit structure block diagram of its segmented LED drive device provided for the present invention second preferred embodiment.As shown in Figure 6, in the second preferred embodiment provided by the invention, described LED string 200 comprises the second LED string 202, the 3rd LED string 203, the 4th LED string 204 and the 5th LED string 205; Described LED group 300 comprises the second LED group 302 and the 3rd LED group 303; Described LED string switch group 400 comprises the second LED string switch 402, the 3rd LED string switch 403, the 4th LED string switch 404 and the 5th LED string switch 405; Described LED group switches set 500 comprises the second LED group switch 502 and the 3rd LED group switch 503.
The positive pole of described second LED string 202 connects the positive output end of rectifier bridge 100, the negative pole of the second LED string 202 connects the first end A21 of the second LED string switch 402 and the positive pole of the 3rd LED string 203, the G1 end of the second end A22 connection control logical block 700 of described second LED string switch 402, the control signal that the second LED string switch 402 receives control logic unit 700 output controls lighting and extinguishing of the second LED string 202.
The negative pole of described 3rd LED string 203 connects the first end A31 of the 3rd LED string switch 403 and the positive pole of the 4th LED string 204, the G2 end of the second end A32 connection control logical block 700 of the 3rd LED string switch 403, the control signal that the 3rd LED string switch 403 receives control logic unit 700 output controls lighting and extinguishing of the 3rd LED string 203.
The negative pole of described 4th LED string 204 connects the first end A41 of the 4th LED string switch 404 and the positive pole of the 5th LED string 205, the G3 end of the second end A42 connection control logical block 700 of the 4th LED string switch 404; The control signal that 4th LED string switch 404 receives control logic unit 700 output controls lighting and extinguishing of the 4th LED string 204.
The negative pole of described 5th LED string 205 connects the first end A51 of the 5th LED string switch 405, the G4 end of the second end A52 connection control logical block 700 of the 5th LED string switch 405, same, the control signal that the 5th LED string switch 405 receives control logic unit 700 output controls lighting and extinguishing of the 5th LED string 205.
3rd end A23 of the second LED string switch 402, the 3rd end A33 of the 3rd LED string switch 403, the 3rd end A43 of the 4th LED string switch 404, the 3rd end A53 of the 5th LED string switch 405 connect the first end B21 of the second LED group switch 502 and the positive pole of the second LED group 302.
The negative pole of described second LED group 302 connects the first end B31 of the positive pole of the 3rd LED group 303, the 3rd end B23 of the second LED group switch 502 and the 3rd LED group switch 503, the PG1 end of the second end B22 connection control logical block 700 of the second LED group switch 502, the control signal that described second LED group switch 502 receives control logic unit 700 output controls lighting and extinguishing of the second LED group 302.
The negative pole of described 3rd LED group 303 connects the 3rd end B33 of current detecting and error correction unit 600 and the 3rd LED group switch 503, the PG2 end of the second end B32 connection control logical block 700 of the 3rd LED group switch 503, the control signal that described 3rd LED group switch 503 receives control logic unit 700 output controls lighting and extinguishing of the 3rd LED group 303.
In the embodiment of the present invention, described second LED string 202, 3rd LED string 203, 4th LED string 204 is identical with the circuit structure of the first LED string 201 in above-mentioned first preferred embodiment with the 5th LED string 205, second LED string switch 402, 3rd LED string switch 403, 4th LED string switch 404 is identical with the circuit structure of the first LED string switch 401 in above-mentioned first preferred embodiment with the 5th LED string switch 405, second LED group 302 is identical with the circuit structure of the first LED group 301 with the 3rd LED group 303, second LED group switch 502 is identical with the circuit structure of the first LED group switch 501 with the 3rd LED group switch 503, no longer its circuit structure and operation principle are described in detail herein.Further, in this second preferred embodiment, described segmented LED drive device comprises power supply unit 800 equally, and it is identical with connected mode with the circuit structure of the power supply unit 800 in above-mentioned first preferred embodiment, repeats no more herein.
Described control logic unit 700 is for the height according to rectifier bridge 100 output voltage, control the light on and off state of the second LED string 202, the 3rd LED string 203, the 4th LED string 204, the 5th LED string 205, second LED group 302 and the 3rd LED group 303, make the VF value sum being on state of LED, almost consistent with rectifier bridge 100 output voltage, thus realize high power-efficient.
In the embodiment of the present invention, four LED strings (namely second, third, the 4th, the 5th LED string) and two LED groups (i.e. second, third LED group) form by plurality of LEDs chip-in series.Be preferably, configuration is that the quantity of LED in LED group is less than 1/3 of the quantity of LED in LED string; More excellent configuration is, in LED string, LED quantity adds 1 divided by the LED quantity of LED group, thus when control logic unit 700 controls the light on and off of LED string and LED group, can seamlessly transit.
The control method of described control logic unit 700 is specially: control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the open/close states of the second LED string switch 402, the 3rd LED string switch 403, the 4th LED string switch 404, the 5th LED string switch 405, second LED group switch the 502, the 3rd LED group switch 503, regulate the quantity being in the LED of illuminating state, LED current is between undercurrent value and overcurrent value.
When rectifier bridge output voltage is the highest, control logic unit controls controls that the 5th LED string switch 405 is opened, the second LED group switch 502 and the 3rd LED group switch 503 turn off, light the second LED string 202, the 3rd LED string 203, the 4th LED string 204, the 5th LED string 205, second LED group 302 and the 3rd LED group 303, the output voltage of described rectifier bridge is from the highest reduction, when LED current reduction is less than undercurrent value, control the 3rd LED group switch 503 to open, extinguish the 3rd LED group 303, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduces, when LED current continuation reduction is less than undercurrent value, controls the second LED group switch 502 and open, extinguish the second LED group 302, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage continues to reduce, when LED current continuation reduction is less than undercurrent value, control the 5th LED string switch 405, second LED group switch 502 and the 3rd LED group switch 503 turns off, control the 4th LED string switch 404 to open simultaneously, extinguish the 5th LED string 205 and light the second LED group 302 and the 3rd LED group 303; Along with rectifier bridge output voltage continues to reduce, when LED current reduction is less than undercurrent value, controls the 3rd LED group switch 503 and open, extinguish the 3rd LED group 303, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage continues to reduce, when LED current continuation reduction is less than undercurrent value, controls the second LED group switch 502 and open, continue extinguishing second LED group 302, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduces, when LED current continuation reduction is less than undercurrent value, control the 4th LED string switch 404, second LED group switch 502 and the 3rd LED group switch 503 turns off, control the 3rd LED string switch 403 to open simultaneously, extinguish the 4th LED string 204 and light the second LED group 302 and the 3rd LED group 303, then LED current increase is greater than undercurrent value; By that analogy, until when rectifier bridge output voltage is down to minimum, control the second LED string switch 402, second LED group switch 502 and the 3rd LED group switch 503 is opened, control the 3rd LED string switch 403, the 4th LED string switch 404, the 5th LED string switch 405 turn off simultaneously, make the second LED string 202 be illuminating state, the 3rd LED string 203, the 4th LED string 204, the 5th LED string 205, second LED group 302 and the 3rd LED group 303 are OFF state.
When rectifier bridge output voltage is minimum, control logic unit controls controls the 5th LED string switch 405, second LED group switch 502 and the 3rd LED group switch 503 is all opened, and only lights the second LED group 302, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch 503 shutoff and lights the 3rd LED group 303, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the 3rd LED string switch 403, second LED group switch 502 and the 3rd LED group switch 503 is opened, control the second LED string switch 402 to turn off simultaneously, light the 3rd LED string 203 and extinguish the second LED group 302 and the 3rd LED group 303, LED current being reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the second LED group switch 502 and turns off, light the second LED group 302, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch 503 and turns off, light the 3rd LED group 303, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the 4th LED string switch 404, second LED group switch 502 and the 3rd LED group switch 503 are opened, control the 3rd LED string switch 403 to turn off simultaneously, light the 4th LED string 204, and extinguish the second LED group 302 and the 3rd LED group 303, LED current is reduced and is less than overcurrent value, by that analogy, until when rectifier bridge voltage is raised to the highest, control the 5th LED string switch 405 to open, control the second LED string switch 402, 3rd LED string switch 403, 4th LED string switch 404, second LED group switch 502 and the 3rd LED group switch 503 turn off, light the second LED string 202, 3rd LED string 203, 4th LED string 204, 5th LED string 205, second LED group 302 and the 3rd LED group 303.
After system initially powers on, control the 5th LED string switch 405 to open, control the second LED string switch 402, the 3rd LED string switch 403, the 4th LED string switch 404, second LED group switch 502 and the 3rd LED group switch 503 to turn off simultaneously, the second LED string 202, the 3rd LED string 203, the 4th LED string 204, the 5th LED string 205, second LED group 302 and the 3rd LED group 303 are accessed between rectifier bridge and ground.
Afterwards, the undercurrent exported according to current detecting and error correction circuit and over-current signal, according to the mode of rectifier bridge output voltage decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch 405 and second, third LED group switch 503, make LED drive device under the voltage initially powered on, LED current is between undercurrent value and overcurrent value.
Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt the control mode of rising or decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch 405 and second, third LED group switch 503, regulate the quantity of the LED of illuminating state.
According to above-mentioned analysis, when there is undercurrent, the truth table of the light on and off State Transferring of four LED strings and two LED groups is as shown in table 3, wherein Q2_n-1 ~ Q5_n-1 and Q2_n ~ Q5_n represent second, third, the 4th, the current state of the 5th LED string and NextState, Qf2_n-1, Qf3_n-1 and Qf2_n, Qf3_n represent current state and the NextState of second, third LED group:
Undercurrent signal Q2_n-1 Q3_n-1 Q4_n-1 Q5_n-1 Qf2_n-1 Qf3_n-1 Q2_n Q3_n Q4_n Q5_n Qf2_n Qf3_n
1 1 1 1 1 1 1 1 1 1 1 1 0
1 1 1 1 1 1 0 1 1 1 1 0 0
1 1 1 1 1 0 0 1 1 1 0 1 1
1 1 1 1 0 1 1 1 1 1 0 1 0
1 1 1 1 0 1 0 1 1 1 0 0 0
1 1 1 1 0 0 0 1 1 0 0 1 1
1 1 1 0 0 1 1 1 1 0 0 1 0
1 1 1 0 0 1 0 1 1 0 0 0 0
1 1 1 0 0 0 0 1 0 0 0 1 1
1 1 0 0 0 1 1 1 0 0 0 1 0
1 1 0 0 0 1 0 1 0 0 0 0 0
1 1 0 0 0 0 0 1 0 0 0 0 0
Table 3
In table 3, represent when undercurrent signal is 1 that undercurrent signal is effective, now need the quantity reducing the LED lighted, otherwise keep current state.
Then represent that rectifier bridge output voltage is down to minimum when only having the second LED string 202 to light; The voltage that rectifier bridge 100 exports will raise gradually, and LED current raises and is greater than overcurrent value, controls the second LED group switch 502 and turns off, light the second LED group 302, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 3rd LED group switch 503 shutoff and lights the 3rd LED group 303, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 3rd LED string switch 403, second LED group switch 502 and the 3rd LED group switch 503 is opened, control the second LED string switch 402 to turn off simultaneously, light the 3rd LED string 203 and extinguish the second LED group 302 and the 3rd LED group 303, LED current being reduced and is less than overcurrent value; Along with rectifier output voltage raises, LED current raises and is greater than overcurrent value, controls the second LED group switch 502 and turns off, light the second LED group 302, the LED quantity lighted is increased, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current continues to raise, and controls the 3rd LED group switch 503 and turns off, continue to light the 3rd LED group 303, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 4th LED string switch 404, second LED group switch 502 and the 3rd LED group switch 503 is opened, control the 3rd LED string switch 403 to turn off simultaneously, light the 4th LED string 204 and extinguish the second LED group 302 and the 3rd LED group 303, LED current being reduced and is less than overcurrent value; By that analogy, until when rectifier bridge output voltage is raised to the highest, control the 5th LED string switch 405 to open, control the second LED string switch 402, the 3rd LED string switch 403, the 4th LED string switch 404, second LED group switch 502 and the 3rd LED group switch 503 to turn off, light second, third, the 4th, the 5th LED string, the two or three LED group.
Namely after lighting the 4th LED string 204 and extinguish the second LED group 302 and the 3rd LED group 303, along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the second LED group switch 502 to turn off, light the second LED group 302 and make LED current minimizing be less than overcurrent value; Along with LED current continues to raise, control the 3rd LED group switch 503 shutoff and light the 3rd LED group 303, continue to increase the LED quantity lighted, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 5th LED string switch 405, second LED group switch 502 and the 3rd LED group switch 503 is opened, control the 4th LED string switch 404 to turn off simultaneously, light the 5th LED string 205 and extinguish the second LED group 302 and the 3rd LED group 303, increase the LED quantity lighted, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the second LED group switch 502 and turns off, light the second LED group 302, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 3rd LED group switch 503 shutoff and lights the 3rd LED group 303, LED current is reduced and is less than overcurrent value; Now rectifier bridge output voltage rises to the acme, and four LED strings and two LED groups are all lighted.
In like manner during known generation overcurrent, second, third, the 4th, the truth table of the 5th LED string and second, third LED group is as shown in table 4:
Over-current signal Q2_n-1 Q3_n-1 Q4_n-1 Q5_n-1 Qf2_n-1 Qf3_n-1 Q2_n Q3_n Q4_n Q5_n Qf2_n Qf3_n
1 1 0 0 0 0 0 1 0 0 0 １ 0
1 1 0 0 0 1 0 1 0 0 0 １ １
1 1 0 0 0 1 1 1 1 0 0 0 0
1 1 1 0 0 0 0 1 1 0 0 1 0
1 1 1 0 0 1 0 1 1 0 0 1 1
1 1 1 0 0 1 1 1 1 1 0 0 0
1 1 1 1 0 0 0 1 1 1 0 １ 0
1 1 1 1 0 1 0 1 1 1 0 １ １
1 1 1 1 0 1 1 1 1 1 1 0 0
1 1 1 1 1 0 0 1 1 1 1 １ 0
1 1 1 1 1 1 0 1 1 1 1 １ １
1 1 1 1 1 1 1 1 1 1 1 1 1
Table 4
In table 4, represent when over-current signal is 1 that over-current signal is effective, now need the quantity increasing the LED lighted, otherwise keep current state.
Refer to Fig. 7, the circuit structure block diagram of its segmented LED drive device provided for the present invention the 3rd preferred embodiment.As shown in Figure 7, in the 3rd preferred embodiment provided by the invention, described LED string 200 comprises the 6th LED string 206 and the 7th LED string 207; Described LED group 300 comprises the 4th LED group 304 and the 5th LED group 305; Described LED string switch group 400 comprises the 6th LED string switch 406, the 7th LED string switch 407, the 8th LED string switch 408 and the 9th LED string switch 409; Described LED group switches set 500 comprises the 4th LED group switch 504 and the 5th LED group switch 505.
Wherein, the positive pole of described 6th LED string 206 connects the positive output end of rectifier bridge 100, the negative pole of the 6th LED string 206 connects the positive pole of the first end A61 of the 6th LED string switch 406, the first end A71 of the 7th LED string switch 407 and the 7th LED string 207, the G2 end of the second end A62 of described 6th LED string switch 406 and the second end A72 connection control logical block 700 of the 7th LED string switch 407, controls lighting and OFF state of the 6th LED string 206 by LED string switch 406 and the action simultaneously of the 7th LED string switch 407.
The negative pole of described 7th LED string 207 connects the first end A81 of the 8th LED the string switch 408 and first end A91 of the 9th LED string switch 409, the G3 end of the second end A82 connection control logical block 700 of described 8th LED string switch 408, the G4 end of the second end A92 connection control logical block 700 of the 9th LED string switch 409, controls lighting and OFF state of the 7th LED string 207 by the 8th LED string switch 408 and the action simultaneously of the 9th LED string switch 409.
3rd end A83 of the 3rd end A63 of described 6th LED string switch 406, the 3rd end A73 of the 7th LED string switch 407, the 8th LED string switch 408, the 3rd end A93 of the 9th LED string switch 409 connect the first end B41 of the 4th LED group switch 504 and the positive pole of the 4th LED group 304.
The negative pole of described 4th LED group 304 connects the first end B51 of the positive pole of the 5th LED group 305, the 3rd end B43 of the 4th LED group switch 504 and the 5th LED group switch 505, the PG1 end of the second end B42 connection control logical block 700 of the 4th LED group switch 504; The negative pole of described 5th LED group 305 connects current detecting and the first end C1 of error correction unit 600 and the 3rd end B53 of the 5th LED group switch 505, the PG2 end of the second end B52 connection control logical block 700 of the 5th LED group switch 505.
Wherein, 6th LED string 206 is identical with the circuit structure of the first LED string in above-mentioned first preferred embodiment with the 7th LED string 207, 6th LED string switch 406, 7th LED string switch 407, 8th LED string switch 408 is identical with the circuit structure of the first LED string switch 401 in above-mentioned first preferred embodiment with the 9th LED string switch 409, 4th LED group 304 is identical with the circuit structure of the first LED group 301 with the 5th LED group 305, 4th LED group switch 504 is identical with the circuit structure of the first LED group switch 501 with the 5th LED group switch 505, no longer its circuit structure and operation principle are described in detail herein.Further, in the 3rd preferred embodiment, described segmented LED drive device comprises power supply unit 800 equally, and it is identical with connected mode with the circuit structure of the power supply unit 800 in above-mentioned first preferred embodiment, repeats no more herein.
The difference of this 3rd preferred embodiment and above-mentioned second preferred embodiment is only, the peripheral circuit of segmented LED drive device is different, namely its LED string controlled is different with the quantity of LED group, the present embodiment is when controlling the light on and off state of LED string 200, the switch open simultaneously being controlled two LED strings by control logic unit 700 is realized with closedown, when controlling the light on and off state of LED group, realized with closedown by the switch open controlling the LED group switch in parallel with it.
Same, described control logic unit 700 is for the height according to rectifier bridge 100 output voltage, control the light on and off state of the 6th LED string 206, the 7th LED string 207, the 4th LED group 304 and the 5th LED group 305, make the VF value sum being on state of LED, almost consistent with rectifier bridge 100 output voltage, thus realize high power-efficient.
In the embodiment of the present invention, two LED strings (i.e. the 6th, the 7th LED string) and two LED groups (i.e. the 4th, the 5th LED group) are formed by plurality of LEDs chip-in series.LED quantity in described 6th, the 7th LED string is identical, and the LED quantity of the 4th, the 5th LED group is identical, and in LED group, the quantity of LED is less than the quantity of LED in LED string; Be preferably, in LED group, the quantity of LED is less than 1/3 of the quantity of LED in LED string.More excellent configuration is that in described LED group, LED quantity is: in LED string, LED quantity adds 1 divided by the LED quantity of LED group, thus when control logic unit 700 controls the light on and off of LED string and LED group, can seamlessly transit.
Compared with the second preferred embodiment, the quantity of LED string is reduced half by this enforcement, makes segmented LED drive device can be used for low pressure occasion.Second preferred embodiment may be used for the occasion of 220V, and the present embodiment then may be used for the occasion of 110V.When the SEL of control logic unit 700 exports high level, can by controlling to select new tap position and reference voltage, electric current in LED string and LED group is doubled, but, segmented LED drive device in second better enforcement can directly with in the present embodiment, LED current doubled by control logic unit 700, under realizing 220V and 110V occasion, the power output of segmented LED drive device remains unchanged.
The control method of described control logic unit 700 is specially: control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the 6th LED string switch 406, the 7th LED string switch 407, the 8th LED string switch 408, the 9th LED string switch 409, the 4th LED group switch the 504, the 5th LED group switch 505, regulate the quantity being in the LED of illuminating state, LED current is made to be between undercurrent value and overcurrent value, wherein:
When rectifier bridge output voltage is the highest, control logic unit controls the 8th LED string switch 408, the 9th LED string switch 409 are opened, control the 6th LED string switch 406, the 7th LED string switch 407, the 4th LED group switch 504 and the 5th LED group switch 505 to turn off, light the 6th LED string 206, the 7th LED string 207, the 4th LED group 304 and the 5th LED group 305; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 5th LED group switch 505 and opens, and extinguishes the 5th LED group 305 and extinguishes, make LED current increase be greater than undercurrent value; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, and control the 4th LED group switch 504 and open, extinguish the 4th LED group 304, LED current increase is greater than undercurrent value; Along with rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, control the 6th LED string switch 406 and the 7th LED string switch 407 is opened, control the 8th LED string switch 408, the 9th LED string switch 409, the 4th LED group switch 504 and the 5th LED group switch 505 to turn off simultaneously, extinguish the 7th LED string 207, light the 4th LED group 304 and the 5th LED group 305, make LED current increase be greater than undercurrent value; Along with LED current continues to reduce, control the 5th LED group switch 505 and open, extinguish the 5th LED group 305; Along with rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, and control the 4th LED group switch 504 and open, continue extinguishing the 4th LED group 304, LED current increase is greater than undercurrent value;
When rectifier bridge output voltage is minimum, control logic unit controls the 8th LED string switch 408, the 9th LED string switch 409 turn off, 6th LED string switch 406, the 7th LED string switch 407, the 4th LED group switch the 504, the 5th LED group switch 505 are opened, and light the 7th LED string 207; Along with rectifier bridge output voltage raises, LED current raises rising and is greater than overcurrent value, controls the 4th LED group switch 504 and turns off, light the 4th LED group 304; Along with LED current continues to raise, control the 5th LED group switch 505 and turn off, continue to light the 5th LED group 305, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 8th LED string switch 408, the 9th LED string switch 409, the 4th LED group switch 504 and the 5th LED group switch 505 to open, control the 6th LED string switch 406, the 7th LED string switch 407 turn off simultaneously, light the 7th LED string 207, extinguish the 4th LED group 304 and the 5th LED group 305 simultaneously, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 4th LED string switch and turns off, light the 4th LED group 304, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 5th LED string switch and turns off, continue to light the 5th LED group 305, and LED current minimizing is less than overcurrent value.
According to above-mentioned analysis, when there is undercurrent, the truth table of the light on and off State Transferring of two LED strings and two LED groups is as shown in table 5, wherein Q6_n-1, Q7_n-1 and Q6_n, Q7_n represent current state and the NextState of the 6th, the 7th LED string, and Qf4_n-1, Qf5_n-1 and Qf4_n, Qf5_n represent current state and the NextState of the 4th, the 5th LED group.
Undercurrent signal Q6_n-1 Q7_n-1 Qf4_n-1 Qf5_n-1 Q6_n Q7_n Qf4_n Qf5_n
1 1 1 1 1 1 1 1 0
1 1 1 1 0 1 1 0 0
1 1 1 0 0 1 0 1 1
1 1 0 1 1 1 0 1 0
1 1 0 1 0 1 0 0 0
1 1 0 0 0 1 0 0 0
Table 5
Equally in table 5, represent when undercurrent signal is 1 that undercurrent signal is effective, now need the quantity reducing the LED lighted, otherwise keep current state.
Then represent that rectifier bridge output voltage is down to minimum when only having the 6th LED string 206 to light, and then the voltage that rectifier bridge 100 exports will raise gradually, LED current raises and is greater than overcurrent value, control the 4th LED group switch 504 to turn off, light the 4th LED group 304, increase the LED quantity lighted, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 5th LED group switch 505 and turns off, continue to light the 5th LED group 305, by continuing to increase the LED quantity lighted, LED current being reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 8th LED string switch 408, the 9th LED string switch 409, the 4th LED group switch 504 and the 5th LED group switch 505 to open, control the 6th LED string switch 406, the 7th LED string switch 407 turn off simultaneously, continue to light the 7th LED string 207, extinguish the 4th LED group 304 and the 5th LED group 305 simultaneously, continue to increase the LED quantity lighted, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 4th LED string switch 404 and turns off, light the 4th LED group 304, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage reduces, LED current raises and is greater than overcurrent value, control the 5th LED string switch 405 to turn off, continuing to light the 5th LED group 305 makes LED current minimizing be less than overcurrent value, now rectifier bridge output voltage rises to the acme, and two LED strings and two LED groups are all lighted.
In like manner during known generation overcurrent, the truth table of the 6th, the 7th LED string and the 4th, the 5th LED group is as shown in table 6:
Over-current signal Q6_n-1 Q7_n-1 Qf4_n-1 Qf5_n-1 Q6_n Q7_n Qf4_n Qf5_n
1 1 0 0 0 1 0 １ 0
1 1 0 1 0 1 0 １ １
1 1 0 1 1 1 1 0 0
1 1 1 0 0 1 1 1 0
1 1 1 1 0 1 1 1 1
1 1 1 1 1 1 1 １ １
Table 6
In table 6, when over-current signal is 1, indicate over-current signal, now need the quantity increasing the LED lighted, otherwise keep current state.
Based on above-mentioned first preferred embodiment, the present invention also provides the driving method of the segmented LED drive device of above-mentioned first preferred embodiment for the first preferred embodiment, it comprises: control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the open/close states of the first LED string switch, the first LED group switch, regulate the quantity being in the LED of illuminating state, make LED current be between undercurrent value and overcurrent value; Wherein:
When rectifier bridge output voltage is the highest, control logic unit controls first LED string switch is opened, and the first LED group switch OFF, makes the first LED string and the first LED group be in illuminating state; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, and control logic unit controls controls the first LED group switch open, extinguishes the LED in the first LED group, makes LED current increase be greater than floor level of electric current;
When rectifier bridge output voltage is minimum, control logic unit controls first LED string switch and the first LED group switch are all opened, and make the first LED group be in illuminating state; When rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the first LED group switch OFF, lights the LED in the first LED group, LED current is reduced and is less than upper current limit value;
After system initially powers on, control the first LED string switch and open and the first LED group switch OFF, make the first LED string and the first LED group access between rectifier bridge and ground;
Afterwards, control mode when reducing according to rectifier bridge output voltage, controls the open/close states of the first LED group switch and the first LED group switch, makes LED current between undercurrent value and overcurrent value;
Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt LED current in rising or the control mode of decline stage, control the open/close states of the first LED group switch and the first LED group switch, regulate the quantity of the LED of illuminating state.
Based on above-mentioned second preferred embodiment, the present invention also provides the driving method of the segmented LED drive device of above-mentioned second preferred embodiment for the second preferred embodiment, it comprises:
Control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the open/close states of the second LED string switch, the 3rd LED string switch, the 4th LED string switch, the 5th LED string switch, the second LED group switch, the 3rd LED group switch, regulate the quantity being in the LED of illuminating state, LED current is made to be between undercurrent value and overcurrent value, wherein:
When rectifier bridge output voltage is the highest, control logic unit controls controls the 5th LED string switch unlatching, the second LED group switch and the 3rd LED group switch OFF, light the second LED string, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group, the output voltage of described rectifier bridge is from the highest reduction, when LED current reduction is less than undercurrent value, control the 3rd LED group switch open, extinguish the 3rd LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduces, when LED current continuation reduction is less than undercurrent value, controls the second LED group switch open, extinguish the second LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage continues to reduce, when LED current continuation reduction is less than undercurrent value, control the 5th LED string switch, the second LED group switch and the 3rd LED group switch OFF, control the 4th LED string switch to open simultaneously, extinguish the 5th LED string and light the second LED group and the 3rd LED group; Along with rectifier bridge output voltage continues to reduce, when LED current reduction is less than undercurrent value, control the 3rd LED group switch open, extinguish the 3rd LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage continues to reduce, when LED current continuation reduction is less than undercurrent value, control the second LED group switch open, continue extinguishing second LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduces, when LED current continuation reduction is less than undercurrent value, control the 4th LED string switch, the second LED group switch and the 3rd LED group switch OFF, control the 3rd LED string switch to open simultaneously, extinguish the 4th LED string and light the second LED group and the 3rd LED group, then LED current increase is greater than undercurrent value; By that analogy, until when rectifier bridge output voltage is down to minimum, control the second LED string switch, the second LED group switch and the 3rd LED group switch open, control the 3rd LED string switch, the 4th LED string switch, the 5th LED string switch shutoff simultaneously, the second LED string is made to be illuminating state, 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group are OFF state, now, rectifier bridge 100 export voltage be down to minimum, next stage its voltage will be in propradation.
Namely the 4th LED string is extinguished and after lighting the second LED group and the 3rd LED group, along with rectifier bridge output voltage reduce time, LED current reduce be less than undercurrent value, control the 3rd LED group switch open, extinguish the 3rd LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduce time, LED current reduce be less than undercurrent value, control the second LED group switch open, second LED group extinguish, the LED quantity lighted is reduced further, makes LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduce time, LED current reduction is less than undercurrent value, control the 3rd LED string switch, the second LED group switch and the 3rd LED group switch OFF, control the second LED string switch to open simultaneously, extinguish the 3rd LED string and light the second LED group and the 3rd LED group, making LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduce time, LED current reduce be less than undercurrent value, control the 3rd LED group switch open, extinguish the 3rd LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduce time, LED current reduce be less than undercurrent value, control the second LED group switch open, second LED group extinguish, make LED current increase be greater than undercurrent value, now LED current is down to minimum, only lights the second LED string.
Then represent that when only having the second LED string to light the output voltage of rectifier bridge has been down to minimum, next stage rectifier bridge export voltage will raise gradually, along with rectifier bridge output voltage raises, control logic unit controls controls the 5th LED string switch, the second LED group switch and the 3rd LED group switch and all opens, and only lights the second LED group, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch OFF and lights the 3rd LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the 3rd LED string switch, the second LED group switch and the 3rd LED group switch open, control the second LED string switch to turn off simultaneously, light the 3rd LED string and extinguish the second LED group and the 3rd LED group, LED current being reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the second LED group switch OFF, lights the second LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch OFF, lights the 3rd LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the 4th LED string switch, second LED group switch and the 3rd LED group switch open, control the 3rd LED string switch to turn off simultaneously, light the 4th LED string, and extinguish the second LED group and the 3rd LED group, LED current is reduced and is less than overcurrent value, by that analogy, until when rectifier bridge voltage is raised to the highest, control the 5th LED string switch to open, control the second LED string switch, 3rd LED string switch, 4th LED string switch, second LED group switch and the 3rd LED group switch OFF, light the second LED string, 3rd LED string, 4th LED string, 5th LED string, second LED group and the 3rd LED group, by that analogy, until when rectifier bridge output voltage rises to the highest, control the 5th LED string switch to open, control the second LED string switch, the 3rd LED string switch, the 4th LED string switch, the second LED group switch and the 3rd LED group switch OFF, light the second LED string, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group.
Namely after lighting the 4th LED string, extinguishing the second LED group and the 3rd LED group, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the second LED group switch OFF, light the second LED group, increase the LED quantity lighted, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch OFF and lights the 3rd LED group, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 5th LED string switch, the second LED group switch and the 3rd LED group switch open, control the 4th LED string switch to turn off simultaneously, light the 5th LED string and extinguish the second LED group and the 3rd LED group, LED current being reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the second LED group switch OFF, lights the second LED group, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 3rd LED group switch OFF and lights the 3rd LED group, LED current is reduced and is less than overcurrent value; Now LED current rises to the highest, and four LED strings and two LED groups are all lighted.
After system initially powers on, control the 5th LED string switch to open, control the second LED string switch, the 3rd LED string switch, the 4th LED string switch, the second LED group switch and the 3rd LED group switch OFF simultaneously, make the second LED string, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group access between rectifier bridge and ground;
Afterwards, the undercurrent exported according to current detecting and error correction circuit and over-current signal, according to the mode of rectifier bridge output voltage decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch and second, third LED group switch, make LED drive device under the voltage initially powered on, LED current is between undercurrent value and overcurrent value;
Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt and rise or the control mode of decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch and second, third LED group switch, regulate the quantity of the LED of illuminating state.
Based on above-mentioned 3rd preferred embodiment, the present invention also provides the driving method of the segmented LED drive device of above-mentioned second preferred embodiment for the 3rd preferred embodiment, it comprises:
Control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the 6th LED string switch, the 7th LED string switch, the 8th LED string switch, the 9th LED string switch, the 4th LED group switch, the 5th LED group switch, regulate the quantity being in the LED of illuminating state, LED current is made to be between undercurrent value and overcurrent value, wherein:
When rectifier bridge output voltage is the highest, control logic unit controls the 8th LED string switch, the 9th LED string switch are opened, control the 6th LED string switch, the 7th LED string switch, the 4th LED group switch and the 5th LED group switch OFF, light the 6th LED string, the 7th LED string, the 4th LED group and the 5th LED group; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 5th LED group switch open, extinguishes the 5th LED group and extinguishes, make LED current increase be greater than undercurrent value; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 4th LED group switch open, and extinguish the 4th LED group, LED current increase is greater than undercurrent value; Along with rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, control the 6th LED string switch and the unlatching of the 7th LED string switch, control the 8th LED string switch, the 9th LED string switch, the 4th LED group switch and the 5th LED group switch OFF simultaneously, extinguish the 7th LED string, light the 4th LED group and the 5th LED group, make LED current increase be greater than undercurrent value; Along with LED current continues to reduce, control the 5th LED group switch open, extinguish the 5th LED group; Along with rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 4th LED group switch open, and continue extinguishing the 4th LED group, LED current increase is greater than undercurrent value;
When rectifier bridge output voltage is minimum, control logic unit controls the 8th LED string switch, the 9th LED string switch turn off, 6th LED string switch, the 7th LED string switch, the 4th LED group switch, the 5th LED group switch open, light the 7th LED string; Along with rectifier bridge output voltage raises, LED current raises rising and is greater than overcurrent value, controls the 4th LED group switch OFF, lights the 4th LED group; Along with LED current continues to raise, control the 5th LED group switch OFF, continue to light the 5th LED group, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 8th LED string switch, the 9th LED string switch, the 4th LED group switch and the 5th LED group switch open, control the 6th LED string switch simultaneously, the 7th LED string switch turns off, light the 7th LED string, extinguish the 4th LED group and the 5th LED group simultaneously, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 4th LED string switch and turns off, light the 4th LED group, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 5th LED string switch to turn off, continue to light the 5th LED group, LED current minimizing is less than overcurrent value, now rectifier bridge output voltage has risen to the highest, and two LED strings and two LED groups are all lighted, and the voltage that rectifier bridge exports will enter the next decline stage.
Based on above-mentioned segmented LED drive device and driving method thereof, the present invention is corresponding provides a kind of LED light device, and it comprises rectifier bridge, LED string, LED group and above-mentioned segmented LED drive device for carrying out rectification to input signal; Described rectifier bridge connects LED string and LED group by segmented LED drive device.In LED light device, described segmented LED drive device is designed to a kind of LED drive chip, is used in LED circuit, is used for Direct driver LED, because this segmented LED drive device has been described in detail above, repeats no more herein.
In sum, the present invention, directly by LED drive device driving LED, does not need to use inductance and electrochemical capacitor, saves material cost, improve the stability of system; Regulated the light on and off state of the LED in LED string and LED group simultaneously by LED drive device according to rectifier bridge size in real time, substantially increasing the efficiency of LED drive device, can more than 95% be reached through testing its efficiency.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the present invention.

Claims (7)

1. a segmented LED drive device, it is connected with rectifier bridge, LED string and LED group, and for lighting or extinguishing the LED in LED string and LED group, described segmented LED drive device comprises:
LED string switch group, for lighting or extinguishing the LED in LED string;
LED group switches set, for lighting or extinguishing the LED in LED group;
It is characterized in that, also comprise:
Current detecting and error correction unit, for detecting the curent change of LED;
Control logic unit, for controlling LED string switch group and the open and close of LED group switches set according to the testing result of current detecting and error correction unit;
The positive output end of described rectifier bridge connects the positive pole of LED string, the negative output terminal ground connection of rectifier bridge; The negative pole of described LED string connects the first end of LED string switch group; Second end connection control logical block of LED string switch group, the first end of three-terminal link LED group switches set of LED string switch group and the positive pole of LED group; Second end connection control logical block of described LED group switches set, the negative pole of three-terminal link LED group of LED group switches set and the first end of current detecting and error correction unit; Second end connection control logical block of described current detecting and error correction unit, the 3rd end ground connection of current detecting and error correction unit;
Described segmented LED drive device, also comprises the power supply unit for powering;
Described LED string comprises the first LED string;
Described LED group comprises the first LED group;
In described first LED group, the quantity of LED is less than the quantity of LED in the first LED string;
Described LED string switch group comprises the first LED string switch;
Described LED group switches set comprises the first LED group switch;
One end of described power supply unit connects the positive output end of rectifier bridge and the positive pole of the first LED string, and the other end of power supply unit connects the 4th end of the first LED string switch; The negative pole of described first LED string connects the first end of the first LED string switch; Second end connection control logical block of the first LED string switch, the first end of three-terminal link first LED group switch of the first LED string switch and the positive pole of the first LED group; Second end connection control logical block of described first LED group switch, the negative pole of three-terminal link first LED group of the first LED group switch and the first end of current detecting and error correction unit;
Control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the open/close states of the first LED string switch, the first LED group switch, regulate the quantity being in the LED of illuminating state, make LED current be between undercurrent value and overcurrent value; Wherein:
When rectifier bridge output voltage is the highest, control logic unit controls first LED string switch is opened, and the first LED group switch OFF, makes the first LED string and the first LED group be in illuminating state; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, and control logic unit controls controls the first LED group switch open, extinguishes the LED in the first LED group, makes LED current increase be greater than floor level of electric current;
When rectifier bridge output voltage is minimum, control logic unit controls first LED string switch and the first LED group switch are all opened, and make the first LED group be in illuminating state; When rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the first LED group switch OFF, lights the LED in the first LED group, LED current is reduced and is less than upper current limit value;
After system initially powers on, control the first LED string switch and open and the first LED group switch OFF, make the first LED string and the first LED group access between rectifier bridge and ground;
Afterwards, control mode when reducing according to rectifier bridge output voltage, controls the open/close states of the first LED group switch and the first LED group switch, makes LED current between undercurrent value and overcurrent value;
Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt LED current in rising or the control mode of decline stage, control the open/close states of the first LED group switch and the first LED group switch, regulate the quantity of the LED of illuminating state.
2. segmented LED drive device according to claim 1, it is characterized in that, described first LED string switch comprises: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor, the 8th metal-oxide-semiconductor and diode;
The drain electrode of described first metal-oxide-semiconductor connects the negative pole of the first LED string, the source electrode of the first metal-oxide-semiconductor is connected the first end of the first LED group switch with the source electrode of the 8th metal-oxide-semiconductor, the grid of the first metal-oxide-semiconductor connects the drain electrode of the 6th metal-oxide-semiconductor and the drain electrode of the 8th metal-oxide-semiconductor, the source electrode of the 6th metal-oxide-semiconductor is connected power supply unit with the source electrode of the 5th metal-oxide-semiconductor, and the drain electrode of the 5th metal-oxide-semiconductor connects the grid of the 6th metal-oxide-semiconductor and the grid of the 4th metal-oxide-semiconductor; The G1 end of the grid of the 5th metal-oxide-semiconductor and the grid connection control logical block of the 8th metal-oxide-semiconductor; The source electrode of the 4th metal-oxide-semiconductor connects power supply unit; The drain electrode of the 4th metal-oxide-semiconductor connects the drain electrode of the 3rd metal-oxide-semiconductor, the G1 end of the grid connection control logical block of the 3rd metal-oxide-semiconductor, and the source electrode of the 3rd metal-oxide-semiconductor connects the drain electrode of the second metal-oxide-semiconductor, the source ground of the second metal-oxide-semiconductor, and the grid of the second metal-oxide-semiconductor connects bias voltage source; The positive pole of described diode connects the source electrode of described first metal-oxide-semiconductor and the source electrode of the 8th metal-oxide-semiconductor, and the negative pole of diode connects the grid of the first metal-oxide-semiconductor and the drain electrode of the 8th metal-oxide-semiconductor.
3. segmented LED drive device according to claim 2, is characterized in that, described first LED group switch comprises the 9th metal-oxide-semiconductor, the tenth metal-oxide-semiconductor, the 11 metal-oxide-semiconductor and resistance;
The source electrode of described 9th metal-oxide-semiconductor connects the source electrode of the first metal-oxide-semiconductor and the positive pole of the first LED group, the drain electrode of the 9th metal-oxide-semiconductor connects current detecting and the first end of error correction unit and the negative pole of the first LED group, and the grid of the 9th metal-oxide-semiconductor connects the drain electrode of the tenth metal-oxide-semiconductor, also connects the source electrode of the first metal-oxide-semiconductor and the source electrode of the 9th metal-oxide-semiconductor by described resistance; The PG1 end of the grid connection control logical block of described tenth metal-oxide-semiconductor, the source electrode of the tenth metal-oxide-semiconductor connects the drain electrode of the 11 metal-oxide-semiconductor; The source ground of the 11 metal-oxide-semiconductor, the grid of the 11 metal-oxide-semiconductor connects bias DC voltage source.
4. segmented LED drive device according to claim 3, is characterized in that, described current detecting and error correction unit comprise: the first comparator, the second comparator, the 3rd comparator, the 4th comparator, with door, nor gate and rheostat;
The in-phase input end of the in-phase input end of described first comparator, the in-phase input end of the second comparator, the 3rd comparator is connected the negative pole of the first LED group and rheostatic one end with the in-phase input end of the 4th comparator, and the inverting input of the inverting input of the first comparator, the inverting input of the second comparator, the 3rd comparator is connected different DC offset voltages with the inverting input of the 4th comparator; Rheostatic other end ground connection, the SEL end of described rheostatic resistor tap connection control logical block; The output of described first comparator connects the first input end with door, and the output of the second comparator connects the second input with door, holds with the OV_H of the output connection control logical block of door; The output of described 3rd comparator connects the first input end of nor gate, and the output of the 4th comparator connects the second input of nor gate, the OV_L end of the output connection control logical block of nor gate.
5. a segmented LED drive device, it is connected with rectifier bridge, LED string and LED group, and for lighting or extinguishing the LED in LED string and LED group, described segmented LED drive device comprises:
LED string switch group, for lighting or extinguishing the LED in LED string;
LED group switches set, for lighting or extinguishing the LED in LED group;
It is characterized in that, also comprise:
Current detecting and error correction unit, for detecting the curent change of LED;
Control logic unit, for controlling LED string switch group and the open and close of LED group switches set according to the testing result of current detecting and error correction unit;
The positive output end of described rectifier bridge connects the positive pole of LED string, the negative output terminal ground connection of rectifier bridge; The negative pole of described LED string connects the first end of LED string switch group; Second end connection control logical block of LED string switch group, the first end of three-terminal link LED group switches set of LED string switch group and the positive pole of LED group; Second end connection control logical block of described LED group switches set, the negative pole of three-terminal link LED group of LED group switches set and the first end of current detecting and error correction unit; Second end connection control logical block of described current detecting and error correction unit, the 3rd end ground connection of current detecting and error correction unit;
Described LED string comprises the second LED string, the 3rd LED string, the 4th LED string and the 5th LED string;
Described LED group comprises the second LED group and the 3rd LED group;
Second, third, the 4th, LED quantity in the 5th LED string is identical, the LED quantity in second, third LED group is identical, and in LED group, the quantity of LED is less than the quantity of LED in LED string;
Described LED string switch group comprises the second LED string switch, the 3rd LED string switch, the 4th LED string switch and the 5th LED string switch;
Described LED group switches set comprises the second LED group switch and the 3rd LED group switch;
The positive pole of described second LED string connects the positive output end of rectifier bridge, and the negative pole of the second LED string connects the first end of the second LED string switch and the positive pole of the 3rd LED string, the second end connection control logical block of described second LED string switch;
The negative pole of described 3rd LED string connects the first end of the 3rd LED string switch and the positive pole of the 4th LED string, the second end connection control logical block of the 3rd LED string switch;
The negative pole of described 4th LED string connects the first end of the 4th LED string switch and the positive pole of the 5th LED string, the second end connection control logical block of the 4th LED string switch;
The negative pole of the 5th LED string connects the first end of the 5th LED string switch, the second end connection control logical block of the 5th LED string switch;
3rd end of the 3rd end of the second LED string switch, the 3rd end of the 3rd LED string switch, the 4th LED string switch, the first end of three-terminal link second LED group switch of the 5th LED string switch and the positive pole of the second LED group;
The negative pole of described second LED group connects the first end of the positive pole of the 3rd LED group, the 3rd end of the second LED group switch and the 3rd LED group switch, the second end connection control logical block of the second LED group switch;
The negative pole of described 3rd LED group connects the 3rd end of current detecting and error correction unit and the 3rd LED group switch, the second end connection control logical block of the 3rd LED group switch;
Control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the open/close states of the second LED string switch, the 3rd LED string switch, the 4th LED string switch, the 5th LED string switch, the second LED group switch, the 3rd LED group switch, regulate the quantity being in the LED of illuminating state, LED current is made to be between undercurrent value and overcurrent value, wherein:
When rectifier bridge output voltage is the highest, control logic unit controls controls the 5th LED string switch unlatching, the second LED group switch and the 3rd LED group switch OFF, light the second LED string, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group, the output voltage of described rectifier bridge is from the highest reduction, when LED current reduction is less than undercurrent value, control the 3rd LED group switch open, extinguish the 3rd LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduces, when LED current continuation reduction is less than undercurrent value, controls the second LED group switch open, extinguish the second LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage continues to reduce, when LED current continuation reduction is less than undercurrent value, control the 5th LED string switch, the second LED group switch and the 3rd LED group switch OFF, control the 4th LED string switch to open simultaneously, extinguish the 5th LED string and light the second LED group and the 3rd LED group; Along with rectifier bridge output voltage continues to reduce, when LED current reduction is less than undercurrent value, control the 3rd LED group switch open, extinguish the 3rd LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage continues to reduce, when LED current continuation reduction is less than undercurrent value, control the second LED group switch open, continue extinguishing second LED group, make LED current increase be greater than undercurrent value; Along with rectifier bridge output voltage reduces, when LED current continuation reduction is less than undercurrent value, control the 4th LED string switch, the second LED group switch and the 3rd LED group switch OFF, control the 3rd LED string switch to open simultaneously, extinguish the 4th LED string and light the second LED group and the 3rd LED group, then LED current increase is greater than undercurrent value; By that analogy, until when rectifier bridge output voltage is down to minimum, control the second LED string switch, the second LED group switch and the 3rd LED group switch open, control the 3rd LED string switch, the 4th LED string switch, the 5th LED string switch shutoff simultaneously, make the second LED string be illuminating state, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group are OFF state;
When rectifier bridge output voltage is minimum, control logic unit controls controls the 5th LED string switch, the second LED group switch and the 3rd LED group switch and all opens, and only lights the second LED group, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch OFF and lights the 3rd LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the 3rd LED string switch, the second LED group switch and the 3rd LED group switch open, control the second LED string switch to turn off simultaneously, light the 3rd LED string and extinguish the second LED group and the 3rd LED group, LED current being reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the second LED group switch OFF, lights the second LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, controls the 3rd LED group switch OFF, lights the 3rd LED group, LED current is reduced and is less than overcurrent value, along with rectifier bridge output voltage raises, LED current increases to over overcurrent value, control the 4th LED string switch, second LED group switch and the 3rd LED group switch open, control the 3rd LED string switch to turn off simultaneously, light the 4th LED string, and extinguish the second LED group and the 3rd LED group, LED current is reduced and is less than overcurrent value, by that analogy, until when rectifier bridge voltage is raised to the highest, control the 5th LED string switch to open, control the second LED string switch, 3rd LED string switch, 4th LED string switch, second LED group switch and the 3rd LED group switch OFF, light the second LED string, 3rd LED string, 4th LED string, 5th LED string, second LED group and the 3rd LED group,
After system initially powers on, control the 5th LED string switch to open, control the second LED string switch, the 3rd LED string switch, the 4th LED string switch, the second LED group switch and the 3rd LED group switch OFF simultaneously, make the second LED string, the 3rd LED string, the 4th LED string, the 5th LED string, the second LED group and the 3rd LED group access between rectifier bridge and ground;
Afterwards, the undercurrent exported according to current detecting and error correction circuit and over-current signal, according to the mode of rectifier bridge output voltage decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch and second, third LED group switch, make LED drive device under the voltage initially powered on, LED current is between undercurrent value and overcurrent value;
Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt and rise or the control mode of decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch and second, third LED group switch, regulate the quantity of the LED of illuminating state.
6. a segmented LED drive device, it is connected with rectifier bridge, LED string and LED group, and for lighting or extinguishing the LED in LED string and LED group, described segmented LED drive device comprises:
LED string switch group, for lighting or extinguishing the LED in LED string;
LED group switches set, for lighting or extinguishing the LED in LED group;
It is characterized in that, also comprise:
Current detecting and error correction unit, for detecting the curent change of LED;
Control logic unit, for controlling LED string switch group and the open and close of LED group switches set according to the testing result of current detecting and error correction unit;
The positive output end of described rectifier bridge connects the positive pole of LED string, the negative output terminal ground connection of rectifier bridge; The negative pole of described LED string connects the first end of LED string switch group; Second end connection control logical block of LED string switch group, the first end of three-terminal link LED group switches set of LED string switch group and the positive pole of LED group; Second end connection control logical block of described LED group switches set, the negative pole of three-terminal link LED group of LED group switches set and the first end of current detecting and error correction unit; Second end connection control logical block of described current detecting and error correction unit, the 3rd end ground connection of current detecting and error correction unit;
Described LED string comprises the 6th LED string and the 7th LED string;
Described LED group comprises the 4th LED group and the 5th LED group;
LED quantity in described 6th, the 7th LED string is identical, and the LED quantity of the 4th, the 5th LED group is identical, and in LED group, the quantity of LED is less than the quantity of LED in LED string;
Described LED string switch group comprises the 6th LED string switch, the 7th LED string switch, the 8th LED string switch and the 9th LED string switch;
Described LED group switches set comprises the 4th LED group switch and the 5th LED group switch;
The positive pole of described 6th LED string connects the positive output end of rectifier bridge, the negative pole of the 6th LED string connects the positive pole of the first end of the 6th LED string switch, the first end of the 7th LED string switch and the 7th LED string, the second end of described 6th LED string switch and the second end connection control logical block of the 7th LED string switch;
The negative pole of described 7th LED string connects the first end of the 8th LED string switch and the first end of the 9th LED string switch, the second end of described 8th LED string switch and the second end connection control logical block of the 9th LED string switch;
3rd end of the 3rd end of described 6th LED string switch, the 3rd end of the 7th LED string switch, the 8th LED string switch, the first end of three-terminal link the 4th LED group switch of the 9th LED string switch and the positive pole of the 4th LED group;
The negative pole of described 4th LED group connects the first end of the positive pole of the 5th LED group, the 3rd end of the 4th LED group switch and the 5th LED group switch, the second end connection control logical block of the 4th LED group switch;
The negative pole of described 5th LED group connects the 3rd end of current detecting and error correction unit and the 5th LED group switch, the second end connection control logical block of the 5th LED group switch;
Control logic unit is according to the undercurrent of the output of current detecting and correction module and over-current signal, by controlling the 6th LED string switch, the 7th LED string switch, the 8th LED string switch, the 9th LED string switch, the 4th LED group switch, the 5th LED group switch, regulate the quantity being in the LED of illuminating state, LED current is made to be between undercurrent value and overcurrent value, wherein:
When rectifier bridge output voltage is the highest, control logic unit controls the 8th LED string switch, the 9th LED string switch are opened, control the 6th LED string switch, the 7th LED string switch, the 4th LED group switch and the 5th LED group switch OFF, light the 6th LED string, the 7th LED string, the 4th LED group and the 5th LED group; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 5th LED group switch open, extinguishes the 5th LED group and extinguishes, make LED current increase be greater than undercurrent value; When rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 4th LED group switch open, and extinguish the 4th LED group, LED current increase is greater than undercurrent value; Along with rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, control the 6th LED string switch and the unlatching of the 7th LED string switch, control the 8th LED string switch, the 9th LED string switch, the 4th LED group switch and the 5th LED group switch OFF simultaneously, extinguish the 7th LED string, light the 4th LED group and the 5th LED group, make LED current increase be greater than undercurrent value; Along with LED current continues to reduce, control the 5th LED group switch open, extinguish the 5th LED group; Along with rectifier bridge output voltage reduces, LED current reduction is less than undercurrent value, controls the 4th LED group switch open, and continue extinguishing the 4th LED group, LED current increase is greater than undercurrent value;
When rectifier bridge output voltage is minimum, control logic unit controls the 8th LED string switch, the 9th LED string switch turn off, 6th LED string switch, the 7th LED string switch, the 4th LED group switch, the 5th LED group switch open, light the 7th LED string; Along with rectifier bridge output voltage raises, LED current raises rising and is greater than overcurrent value, controls the 4th LED group switch OFF, lights the 4th LED group; Along with LED current continues to raise, control the 5th LED group switch OFF, continue to light the 5th LED group, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, control the 8th LED string switch, the 9th LED string switch, the 4th LED group switch and the 5th LED group switch open, control the 6th LED string switch simultaneously, the 7th LED string switch turns off, light the 7th LED string, extinguish the 4th LED group and the 5th LED group simultaneously, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 4th LED string switch and turns off, light the 4th LED group, LED current is reduced and is less than overcurrent value; Along with rectifier bridge output voltage raises, LED current raises and is greater than overcurrent value, controls the 5th LED string switch and turns off, continue to light the 5th LED group, and LED current minimizing is less than overcurrent value;
After system initially powers on, control the 8th LED string switch, the 9th LED string switch is opened, 6th LED string switch, the 7th LED string switch, the 4th LED group switch and the 5th LED group switch OFF, make the 6th LED string, the 7th LED string, the 4th LED group and the 5th LED group, between access rectifier bridge and ground;
Afterwards, the undercurrent exported according to current detecting and error correction circuit and over-current signal, according to the control mode of rectifier bridge output voltage decline stage, control the open/close states of the 6th, the 7th, the 8th, the 9th LED string switch and the 4th, the 5th LED group switch, make under the voltage initially powered on, LED current is between undercurrent value and overcurrent value;
Afterwards, output voltage according to current rectifier bridge is in rising or decline stage, adopt and rise or the control mode of decline stage, control second, third, the 4th, the open/close states of the 5th LED string switch and second, third LED group switch, regulate the quantity of the LED of illuminating state.
7. a LED light device, is characterized in that, comprising: for carrying out the rectifier bridge of rectification, LED string, LED group and the segmented LED drive device as described in claim 1-6 any one to input signal; Described rectifier bridge connects LED string and LED group by segmented LED drive device.
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