CN208317066U - A kind of LED lamp drive circuit and light units - Google Patents
A kind of LED lamp drive circuit and light units Download PDFInfo
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- CN208317066U CN208317066U CN201820797057.2U CN201820797057U CN208317066U CN 208317066 U CN208317066 U CN 208317066U CN 201820797057 U CN201820797057 U CN 201820797057U CN 208317066 U CN208317066 U CN 208317066U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model relates to led light technology fields, more particularly to a kind of LED lamp drive circuit and light units.Wherein, LED lamp drive circuit includes: the first LED light to the 6th LED light, first port circuit, second port circuit and third port circuit.Second LED light and third LED light, the first LED light, the second LED light and third LED light anode are all applied first voltage；4th LED light, the 5th LED light and the 6th LED light, 4th LED light anode is connect with the first LED light cathode, 5th LED light anode is connect with the second LED light cathode, 6th LED light anode is connect with third LED light cathode, 4th LED light, the 5th LED light and the 6th LED light cathode are all applied second voltage, and the summation of twice of conduction voltage drop of second voltage and LED light is greater than first voltage.It can drive more LED light with less I/O port, save I/O port resource.
Description
Technical field
The utility model relates to led light technology fields, more particularly to a kind of LED lamp drive circuit and light units.
Background technique
The application field of light emitting diode (Light-Emitting Diode, LED) is extensive, wherein LED light is applied most
Early, widest field is indicator light field, since its power consumption is small, brightness stability, long service life, is typically used to electronics
On instrument or other indicator lights mechanically, such as computer switch, television set, the indicator light on remote controler are all with LED material
It is made.
LED light actuation techniques include two ways at present: one is being directly driven by the port I/O, another kind be using
The driving of LED special driving chip.Wherein, the former is more demanding to I/O port resource, generally requires to account for when driving more LED light
With more I/O port resource.
Utility model content
One purpose of the utility model embodiment is intended to provide a kind of LED lamp drive circuit and light units, can make
More LED light is driven with less I/O port.
In order to solve the above technical problems, the utility model embodiment the following technical schemes are provided:
In a first aspect, the utility model embodiment provides a kind of LED lamp drive circuit, comprising:
First LED light group, including the first LED light, the second LED light and third LED light, first LED light, described second
LED light and the third LED light anode are all applied first voltage；
Second LED light group, including the 4th LED light, the 5th LED light and the 6th LED light, the 4th LED light anode and institute
The connection of the first LED light cathode is stated, the 5th LED light anode is connect with the second LED light cathode, and the 6th LED light is just
Pole is connect with the third LED light cathode, wherein the 4th LED light, the 5th LED light and the 6th LED light cathode
It is all applied second voltage, and the summation of twice of conduction voltage drop of the second voltage and LED light is greater than the first voltage；
First port circuit is connected between the 6th LED light anode and the third LED light cathode, described first
Port circuit is for exporting low and high level or switching to high-impedance state；
Second port circuit is connected between the 5th LED light anode and the second LED light cathode, described second
Port circuit is for exporting low and high level or switching to high-impedance state；
Third port circuit is connected between the 4th LED light anode and the first LED light cathode, the third
Port circuit is for exporting low and high level or switching to high-impedance state；
Wherein, two ends in the first port circuit, the second port circuit and the third port circuit
Mouth circuit switches to high-impedance state, also, in the case where the high/low level of remaining a port circuit output, first LED light
Group is lit with a LED light in second LED light group.
Optionally, the LED lamp drive circuit further include:
7th LED light, the 7th LED light anode and the second port circuit connection, the 7th LED light cathode with
The first port circuit connection, in the first port circuit output low level, the second port circuit output high level,
In the case that the third port circuit switches to high-impedance state, the 7th LED light is lit.
Optionally, the LED lamp drive circuit further include:
8th LED light, the 8th LED light anode and the first port circuit connection, the 8th LED light cathode with
The second port circuit connection, in the first port circuit output high level, the second port circuit output low level,
In the case that the third port circuit switches to high-impedance state, the 8th LED light is lit.
Optionally, the LED lamp drive circuit further include:
9th LED light, the 9th LED light anode and the third port circuit connection, the 9th LED light cathode with
The first port circuit connection, in the first port circuit output low level, the second port circuit switches to high resistant
State, in the case where the third port circuit output high level, the 9th LED light is lit.
Optionally, the LED lamp drive circuit further include:
Tenth LED light, the tenth LED light anode and the first port circuit connection, the tenth LED light cathode with
The third port circuit connection, in the first port circuit output high level, the second port circuit switches to high resistant
State, in the low level situation of third port circuit output, the tenth LED light is lit.
Optionally, the LED lamp drive circuit further include:
11st LED light, the 11st LED light anode and the third port circuit connection, the 11st LED light
Cathode and the second port circuit connection, switch to high-impedance state, the second port in the first port circuit output
Circuit output low level, in the case where the third port circuit output high level, the 11st LED light is lit.
Optionally, the LED lamp drive circuit further include:
12nd LED light, the 12nd LED light anode and the second port circuit connection, the 12nd LED light
Cathode and the third port circuit connection, switch to high-impedance state, the second port in the first port circuit output
Circuit output high level, in the low level situation of third port circuit output, the 12nd LED light is lit.
Optionally, the LED lamp drive circuit further includes emitter follower, and the emitter follower includes the first output end
With second output terminal, first output end all connects with first LED light, the second LED light and third LED light anode respectively
Connect, first output end for exporting the first voltage, the second output terminal all respectively with the 4th LED light, institute
The 5th LED light and the 6th LED light cathode connection are stated, the second output terminal is for exporting the second voltage.
Optionally, the emitter follower includes: NPN triode, first resistor, second resistance, 3rd resistor and PNP tri-
Pole pipe, external power supply with the NPN triode collector and described first resistor one end for connecting respectively, tri- pole NPN
Pipe base stage is connect with the first resistor other end and described second resistance one end respectively, and the NPN triode emitter all divides
It is not connect with first LED light, second LED light and the third LED light anode, the second resistance other end difference
It is connect with described 3rd resistor one end and the PNP triode base stage, the 3rd resistor other end and the PNP triode collection
Electrode is all connected to ground terminal, the PNP triode emitter all respectively with the 4th LED light, the 5th LED light and described
The connection of 6th LED light cathode.
In second aspect, the utility model embodiment provides a kind of light units, including the driving of described in any item LED light
Circuit.
In the LED lamp drive circuit and light units that each embodiment of the utility model provides, first port circuit,
Two port circuits in second port circuit and third port circuit switch to high-impedance state, also, remaining a port electricity
When road exports high/low level, the first LED light group is lit with a LED light in the second LED light group, then, passes through 3 ports
Circuit can drive 6 LED light to be lit, and therefore, be able to use less I/O port and drive more LED light, saved the end IO
Mouth resource.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is that the utility model embodiment provides a kind of schematic block circuit diagram of LED lamp drive circuit；
Fig. 2 is that the utility model embodiment provides a kind of electrical block diagram of LED lamp drive circuit.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
LED lamp drive circuit provided by the embodiment of the utility model can be applied to the light units of any suitable type,
The light units are capable of providing illumination.
Referring to Fig. 1, Fig. 1 is that the utility model embodiment provides a kind of schematic block circuit diagram of LED lamp drive circuit.Such as
Shown in Fig. 1, LED lamp drive circuit 100 includes: the first LED light group 200, the second LED light group 300, first port circuit 400,
Two-port netwerk circuit 500 and third port circuit 600.
First LED light group 200 includes the first LED light 21, the second LED light 22 and third LED light 23, the first LED light 21, the
Two LED light 22 and 23 anode of third LED light are all applied first voltage.
Second LED light group 300 includes the 4th LED light 24, the 5th LED light 25 and the 6th LED light 26, and the 4th LED light 24 is just
Pole is connect with 21 cathode of the first LED light, and 25 anode of the 5th LED light is connect with 22 cathode of the second LED light, 26 anode of the 6th LED light
It is connect with 23 cathode of third LED light.
First port circuit 400 is connected between 26 anode of the 6th LED light and 23 cathode of third LED light, first port electricity
Road 400 is for exporting low and high level or switching to high-impedance state.
Second port circuit 500 is connected between 25 anode of the 5th LED light and 22 cathode of the second LED light, second port electricity
Road 500 is for exporting low and high level or switching to high-impedance state.
Third port circuit 600 is connected between 24 anode of the 4th LED light and 21 cathode of the first LED light, third port electricity
Road 600 is for exporting low and high level or switching to high-impedance state.
In the case where driving a LED light to shine, by first port circuit 400, second port circuit 500 and third end
Any two port circuit switches to high-impedance state, also, the high/low level of remaining a port circuit output in mouth circuit 600,
Also, since the 4th LED light 24, the 5th LED light 25 and 26 cathode of the 6th LED light are all applied second voltage, and second voltage
It is greater than first voltage with the summation of twice of conduction voltage drop of LED light, also that is, V22+2* Δ th > V11, V22 are second voltage, Δ
Th is the conduction voltage drop of LED light, and V11 is first voltage.At this point, there was only one in the first LED light group 200 and the second LED light group 300
A LED light is lit.
For example, the conduction voltage drop for assuming the LED light being related to herein is 2V, and high level is equal to system voltage, it is assumed that high
Level is 5V, first voltage 3V, second voltage 1.6V.When needing to light the first LED light 21, at this point, first port is electric
Road 400 and second port circuit 500 all switch to high-impedance state, and third port circuit 600 is arranged to output mode and exports
Low level.
For the first LED light 21, due to 3-2 > 0, then, the first LED light is connected and is lit.Also, for first
For concatenated 4th LED light 24 of LED light 21, due to 3-2 < 2+1.6, the 4th LED light 24 is non-lit up.
For the second LED light 22 and third LED light 23, since first port circuit 400 and second port circuit 500 are all cut
High-impedance state is shifted to, therefore, the second LED light 22 and third LED light 23 are non-lit up.
When needing to extinguish the first LED light 21, by first port circuit 400, second port circuit 500 and third port circuit
600 all switch to high-impedance state.
Again for example, high-impedance state being switched in first port circuit 400, second port circuit 500 exports low level,
In the case that third port circuit 600 switches to high-impedance state, the second LED light 22 is lit.
Again for example, low level being exported in first port circuit 400, second port circuit 500 switches to high-impedance state,
In the case that third port circuit 600 switches to high-impedance state, third LED light 23 is lit.
Again for example, high-impedance state is switched in first port circuit 400, second port circuit 500 switches to high resistant
State, in the case that third port circuit 600 exports high level, the 4th LED light 24 is lit.
Again for example, high-impedance state being switched in first port circuit 400, second port circuit 500 exports high level,
In the case that third port circuit 600 switches to high-impedance state, the 5th LED light 25 is lit.
Again for example, high level being exported in first port circuit 400, second port circuit 500 switches to high-impedance state,
In the case that third port circuit 600 switches to high-impedance state, the 6th LED light 26 is lit.
Two port circuits in first port circuit 400, second port circuit 500 and third port circuit 600 are cut
High-impedance state is shifted to, also, when the high/low level of remaining a port circuit output, in the first LED light group and the second LED light group
One LED light is lit, and then, 6 LED light can be driven to be lit by 3 port circuits, therefore, be able to use compared with
Few I/O port drives more LED light, has saved I/O port resource.
In some embodiments, referring to Fig. 2, LED lamp drive circuit 100 further include: the 7th LED light 27, the 8th LED light
28, the 9th LED light 29, the tenth LED light 210, the 11st LED light 211 and the 12nd LED light 212.
7th LED light, 27 anode is connect with second port circuit 500,27 cathode of the 7th LED light and first port circuit 400
Connection exports low level in first port circuit 400, and second port circuit 500 exports high level, and third port circuit 600 is cut
In the case where shifting to high-impedance state, the 7th LED light 27 is lit.
8th LED light, 28 anode is connect with first port circuit 400,28 cathode of the 8th LED light and second port circuit 500
Connection exports high level in first port circuit 400, and second port circuit 500 exports low level, and third port circuit 600 is cut
In the case where shifting to high-impedance state, the 8th LED light 28 is lit.
9th LED light, 29 anode is connect with third port circuit 600,29 cathode of the 9th LED light and first port circuit 400
Connection exports low level in first port circuit 400, and second port circuit 500 switches to high-impedance state, third port circuit
In the case where 600 output high level, the 9th LED light 29 is lit.
Tenth LED light, 210 anode is connect with first port circuit 400,210 cathode of the tenth LED light and third port circuit
600 connections export high level in first port circuit 400, and second port circuit 500 switches to high-impedance state, third port electricity
Road 600 exports in low level situation, and the tenth LED light 210 is lit.
11st LED light, 211 anode is connect with third port circuit 600,211 cathode of the 11st LED light and second port
Circuit 500 connects, and switches to high-impedance state in the output of first port circuit 400, and second port circuit 500 exports low level, the
In the case that V-i Characteristics 600 export high level, the 11st LED light 211 is lit.
12nd LED light, 212 anode is connect with second port circuit 500,212 cathode of the 12nd LED light and third port
Circuit 600 connects, and switches to high-impedance state in the output of first port circuit 400, and second port circuit 500 exports high level, the
V-i Characteristics 600 export in low level situation, and the 12nd LED light 212 is lit.
In some embodiments, LED lamp drive circuit 100 further includes emitter follower 700, and emitter follower 700 includes
First output end and second output terminal, the first output end all respectively with the first LED light 21, the second LED light 22 and third LED light 23
Anode connection, the first output end for exporting first voltage, second output terminal all respectively with the 4th LED light 24, the 5th LED light 25
And the connection of 26 cathode of the 6th LED light, second output terminal is for exporting second voltage.
Emitter follower 700 includes: NPN triode Q1, first resistor R1, second resistance R2,3rd resistor R3 and PNP tri-
Pole pipe Q2, external power supply VCC with NPN triode Q1 collector and the one end first resistor R1 for connecting respectively, NPN triode Q1
Base stage is connect with the first resistor R1 other end and the one end second resistance R2 respectively, and NPN triode Q1 emitter is all respectively with first
LED light 21, the second LED light 22 and the anode connection of third LED light 23, the second resistance R2 other end respectively with the one end 3rd resistor R3
It is connected with PNP triode Q2 base stage, the 3rd resistor R3 other end and PNP triode Q2 collector are all connected to ground terminal, tri- pole PNP
Pipe Q2 emitter is all connect with the 4th LED light 24, the 5th LED light 25 and 26 cathode of the 6th LED light respectively.
In some embodiments, first port circuit 400 include first port 41 and the 4th resistance R4, first port 41 and
4th resistance R4 connection.
Second port circuit 500 includes second port 51 and the 5th resistance R5, and second port 51 is connect with the 5th resistance R5.
Third port circuit 600 includes third port 61 and the 6th resistance R6, and third port 61 is connect with the 6th resistance R6.
Peripheral control unit all can be controlled separately first port 41, second port 51 and third port according to control logic
61 switch to high-impedance state or output low and high level.
In order to which the working principle of LED lamp drive circuit provided by the embodiment of the utility model, the present embodiment knot is understood in detail
Close the working principle that Fig. 2, table 1 and table 2 elaborate LED lamp drive circuit, wherein table 1 is the first LED light to the 6th LED light
In the case where being lit, the port status of first port circuit, second port circuit and third port circuit, table 2 is the 7th LED
In the case that lamp is lit to the 12nd LED light, the port shape of first port circuit, second port circuit and third port circuit
State.
Table 1
| The LED being lit | LED1 | LED2 | LED3 | LED4 | LED5 | LED6 |
| First port circuit | Z | Z | 0 | Z | Z | 1 |
| Second port circuit | Z | 0 | Z | Z | 1 | Z |
| Third port circuit | 0 | Z | Z | 1 | Z | Z |
Table 2
| The LED being lit | LED7 | LED8 | LED9 | LED10 | LED11 | LED12 |
| First port circuit | 0 | 1 | 0 | 1 | Z | Z |
| Second port circuit | 1 | 0 | Z | Z | 0 | 1 |
| Third port circuit | Z | Z | 1 | 0 | 1 | 0 |
V1:NPN triode Q1 base stage voltage-to-ground.
V2:NPN triode Q1 emitter voltage-to-ground.
Voltage-to-ground on the right of V3: the four resistance R4.
Voltage-to-ground on the right of V4: the five resistance R5.
Voltage-to-ground on the right of V5: the six resistance R6.
V6:PNP triode Q2 emitter voltage-to-ground.
V7:PNP triode Q2 base stage voltage-to-ground.
Assuming that: LED conduction voltage drop is 2V, and running current reserves 5-15mA, between Q1 and Q2 base stage and emitter
Pressure drop is 0.2V, and first resistor R1 is 3.3K Ω, and second resistance R2 is 2.7K Ω, and 3rd resistor R3 is 2.2K Ω, the 4th resistance
R4, the 5th resistance R5 and the 6th resistance R6 are all 100K Ω.
First LED light 21 is lit: first port circuit 400 is arranged and second port circuit 500 is high-impedance state, setting
Third port circuit 600 is output mode, and exports low level 0.At this point, base voltage (the V1=(4.9/ of triode Q1
8.2) * 5=2.99V), then triode Q1 emitter voltage (V2=2.99-0.2=2.79V).Assuming that the first LED light 21 can be just
It often lights, then the 6th resistance R6 right end voltage (V5=2.79-2=0.79V), the electric current in the circuit is third port circuit 600
=790/100=7.9mA meets 21 normal running conditions of the first LED light, it is assumed that sets up.
First LED light 21 is off: setting first port circuit 400, second port circuit 500 and third port circuit
600 be high-impedance state.
The control method of second LED light 22 and third LED light 23 is similar with the first LED light 21, and only I/O port level is not
With details are not described herein.
4th LED light 24 is lit: setting third port circuit 600 is high level, first port circuit 400 and second end
Mouth circuit 500 is high-impedance state.At this point, the base voltage (V7=(2.2/8.2) * 5=1.34V) of triode Q2.Then triode
The emitter voltage V6=1.34+0.2=1.54V of Q2.Assuming that the 4th LED light 24 can be lighted normally, then the electric current I3 in the circuit
=(5-2-1.54) * 1000/100=14.6mA meets 24 normal running conditions of the 4th LED light, it is assumed that sets up.
4th LED light 24 is off: setting first port circuit 400, second port circuit 500 and third port circuit
600 be high-impedance state.
5th LED light 25 is similar with the control method of the 6th LED light 26, and only I/O port level is different, herein not
It repeats again.
7th LED light 27 is lit: setting third port circuit 600 is output mode, and exports high level.Setting second
Port circuit 500 is output mode, and exports low level.Setting first port circuit 400 is high-impedance state.Assuming that the 7th LED
Lamp 27 can be lighted normally, then flow through electric current I_4=(5-2) * 1000/200=15mA of the 7th LED light 27, then V5=3.5V,
V6=1.34+0.2=1.54V at this time.Then 24 voltage difference of the two ends of the 4th LED light is 3.5-1.54=1.96, less than the 4th LED light
24 normally pressure drop, therefore the 4th LED light 24 not can be lit.
7th LED light, 27 extinguishing method: setting first port circuit 400, second port circuit 500 and third port circuit
600 be high-impedance state.
11st LED light 211 is similar with the control method of the 9th LED light 29, and only I/O port level is different, herein
It repeats no more.
Tenth LED light 210 is lit: setting first port circuit 400 is high level, and setting third port circuit 600 is
Low level 0, setting second port circuit 500 are high-impedance state.Assuming that the tenth LED light 210 can be lighted normally, then pass through the tenth LED
Electric current I2=(5-2) the * 1000/200=15mA. of lamp 210 then V5=100*15=1.5V, at this time 21 both ends of the first LED light electricity
Pressure difference is 2.79-1.5=1.29V, and less than the normally voltage of the first LED light 21, therefore the first LED light 21 will not be by point
It is bright.
Tenth LED light, 210 extinguishing method: setting first port circuit 400, second port circuit 500 and third port electricity
Road 600 is high-impedance state.
The control method and principle of 8th LED light 28 and the 12nd LED light 212 are similar with the tenth LED light 210, only
I/O port level is different, and details are not described herein.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Under the thinking of the utility model, it can also be combined between the technical characteristic in above embodiments or different embodiments,
Step can be realized with random order, and there are many other variations of the different aspect of the utility model as described above, be
Simplicity, they do not provide in details；Although the utility model is described in detail with reference to the foregoing embodiments, this
The those of ordinary skill in field it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments,
Or equivalent replacement of some of the technical features；And these are modified or replaceed, and do not make the sheet of corresponding technical solution
Matter is detached from the range of each embodiment technical solution of the application.
Claims (10)
1. a kind of LED lamp drive circuit characterized by comprising
First LED light group, including the first LED light, the second LED light and third LED light, first LED light, the 2nd LED
Lamp and the third LED light anode are all applied first voltage；
Second LED light group, including the 4th LED light, the 5th LED light and the 6th LED light, the 4th LED light anode and described the
The connection of one LED light cathode, the 5th LED light anode connect with the second LED light cathode, the 6th LED light anode and
Third LED light cathode connection, wherein the 4th LED light, the 5th LED light and the 6th LED light cathode all by
Apply second voltage, and the summation of twice of conduction voltage drop of the second voltage and LED light is greater than the first voltage；
First port circuit is connected between the 6th LED light anode and the third LED light cathode, the first port
Circuit is for exporting low and high level or switching to high-impedance state；
Second port circuit is connected between the 5th LED light anode and the second LED light cathode, the second port
Circuit is for exporting low and high level or switching to high-impedance state；
Third port circuit is connected between the 4th LED light anode and the first LED light cathode, the third port
Circuit is for exporting low and high level or switching to high-impedance state；
Wherein, two port electricity in the first port circuit, the second port circuit and the third port circuit
Road switches to high-impedance state, also, in the case where the high/low level of remaining a port circuit output, first LED light group with
A LED light is lit in second LED light group.
2. LED lamp drive circuit according to claim 1, which is characterized in that the LED lamp drive circuit further include:
7th LED light, the 7th LED light anode and the second port circuit connection, the 7th LED light cathode with it is described
First port circuit connection, in the first port circuit output low level, the second port circuit output high level is described
In the case that third port circuit switches to high-impedance state, the 7th LED light is lit.
3. LED lamp drive circuit according to claim 1, which is characterized in that the LED lamp drive circuit further include:
8th LED light, the 8th LED light anode and the first port circuit connection, the 8th LED light cathode with it is described
Second port circuit connection, in the first port circuit output high level, the second port circuit output low level is described
In the case that third port circuit switches to high-impedance state, the 8th LED light is lit.
4. LED lamp drive circuit according to claim 1, which is characterized in that the LED lamp drive circuit further include:
9th LED light, the 9th LED light anode and the third port circuit connection, the 9th LED light cathode with it is described
First port circuit connection, in the first port circuit output low level, the second port circuit switches to high-impedance state,
In the case where the third port circuit output high level, the 9th LED light is lit.
5. LED lamp drive circuit according to claim 1, which is characterized in that the LED lamp drive circuit further include:
Tenth LED light, the tenth LED light anode and the first port circuit connection, the tenth LED light cathode with it is described
Third port circuit connection, in the first port circuit output high level, the second port circuit switches to high-impedance state,
In the low level situation of third port circuit output, the tenth LED light is lit.
6. LED lamp drive circuit according to claim 1, which is characterized in that the LED lamp drive circuit further include:
11st LED light, the 11st LED light anode and the third port circuit connection, the 11st LED light cathode
With the second port circuit connection, high-impedance state, the second port circuit are switched in the first port circuit output
Low level is exported, in the case where the third port circuit output high level, the 11st LED light is lit.
7. LED lamp drive circuit according to claim 1, which is characterized in that the LED lamp drive circuit further include:
12nd LED light, the 12nd LED light anode and the second port circuit connection, the 12nd LED light cathode
With the third port circuit connection, high-impedance state, the second port circuit are switched in the first port circuit output
High level is exported, in the low level situation of third port circuit output, the 12nd LED light is lit.
8. LED lamp drive circuit according to any one of claims 1 to 7, which is characterized in that the LED lamp drive circuit
It further include emitter follower, the emitter follower includes the first output end and second output terminal, and first output end all divides
It is not connect with first LED light, second LED light and the third LED light anode, first output end is for exporting
The first voltage, the second output terminal all respectively with the 4th LED light, the 5th LED light and the 6th LED light
Cathode connection, the second output terminal is for exporting the second voltage.
9. LED lamp drive circuit according to claim 8, which is characterized in that the emitter follower includes: tri- pole NPN
Pipe, first resistor, second resistance, 3rd resistor and PNP triode, external power supply for respectively with the NPN triode current collection
Pole is connected with described first resistor one end, the NPN transistor base respectively with the first resistor other end and described second
Resistance one end connection, the NPN triode emitter all respectively with first LED light, the second LED light and third LED light just
Pole connection, the second resistance other end connect with described 3rd resistor one end and the PNP triode base stage respectively, and described the
The three resistance other ends and the PNP triode collector are all connected to ground terminal, the PNP triode emitter all respectively with it is described
4th LED light, the 5th LED light and the 6th LED light cathode connection.
10. a kind of light units, which is characterized in that including LED lamp drive circuit as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820797057.2U CN208317066U (en) | 2018-05-25 | 2018-05-25 | A kind of LED lamp drive circuit and light units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820797057.2U CN208317066U (en) | 2018-05-25 | 2018-05-25 | A kind of LED lamp drive circuit and light units |
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| CN208317066U true CN208317066U (en) | 2019-01-01 |
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| CN201820797057.2U Active CN208317066U (en) | 2018-05-25 | 2018-05-25 | A kind of LED lamp drive circuit and light units |
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