CN207427534U - Multichannel light source timesharing constant-current drive circuit - Google Patents
Multichannel light source timesharing constant-current drive circuit Download PDFInfo
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- CN207427534U CN207427534U CN201721515999.9U CN201721515999U CN207427534U CN 207427534 U CN207427534 U CN 207427534U CN 201721515999 U CN201721515999 U CN 201721515999U CN 207427534 U CN207427534 U CN 207427534U
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- light source
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- controllable switch
- detection
- current
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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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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model is related to power technique fields, solve existing multichannel light source constant-current drive circuit and pile up multiple current constant control chips, it is complicated, of high cost the technical issues of.The technical solution adopted is that：Multichannel light source timesharing constant-current drive circuit, including microcontroller, output interface and n light source circuit, n detection resistance, n detection controllable switch, n light source controllable switch and constant-current control module, each light source circuit connects one to one with a detection resistance, a detection controllable switch and a light source controllable switch, microcontroller is connected with controllable switch and constant-current control module, constant-current control module is connected with controllable switch and detection resistance, and n is the positive integer more than or equal to 2.Advantageous effect is：Realize constant current driving and the Time-sharing control of multichannel light source with a constant-current driven chip, it is at low cost, system reliability is high.It is applicable to the product of multiple constant current driving.
Description
Technical field
The utility model is related to power technique fields, more particularly to multichannel light source constant-current drive technology.
Background technology
Multiple constant current driving such as is widely used to illuminate, show at the fields, such as LED illumination, LED backlight, laser-projector
Laser light source driving.At present in many cases, when carrying out Time-sharing control for multichannel light source or controlling size of current respectively,
It is adopted as being equipped with the control methods of corresponding constant current chip per light source all the way.
The multichannel light source constant-current drive circuit of the prior art has piled up multiple constant-current driven chips, not only makes entire circuit
It is of high cost, and component number is more, can influence system reliability.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of multichannel light source constant-current drive circuit simple in structure,
After the corresponding control program of its addition, constant current driving and the Time-sharing control of multichannel light source can be realized.
In order to solve the above technical problems, the technical solution adopted in the utility model is：Multichannel light source timesharing constant current driving electricity
Road, it is controllable including microcontroller, output interface and n light source circuit, n detection resistance, n detection controllable switch, n light source
Switch and constant-current control module, each light source circuit and a detection resistance, a detection controllable switch and a light source
Controllable switch corresponds.Wherein, microcontroller connects respectively with detection controllable switch, light source controllable switch and constant-current control module
It connects, constant-current control module is connected respectively with detection controllable switch, light source controllable switch and detection resistance, detection controllable switch and inspection
Measuring resistance connects, and light source controllable switch is connected with light source circuit and detection resistance, and light source circuit is connected with output interface, and n is big
In or equal to 2 positive integer.
Further, detect controllable switch and light source controllable switch uses triode or field-effect tube.
Specifically, detection controllable switch, using NPN type triode, the wherein base stage of NPN type triode connects with microcontroller
It connects, emitter is connected with constant-current control module, and collector is connected with detection resistance.
Specifically, light source controllable switch uses PNP type triode, the wherein base stage of PNP type triode connects with microcontroller
It connects, emitter is connected with constant-current control module, and collector is connected with light source circuit.
Further, constant-current control module controls chip using a single-channel constant current.
Further, wherein n is equal to 3.
The beneficial effects of the utility model are：Above-mentioned multichannel light source timesharing constant-current drive circuit, in micro controller module plus
After entering corresponding control program, by controlling the working condition of controllable switch and current constant control chip, only with a current constant control core
One passage of piece realizes constant current driving and the Time-sharing control of multichannel light source, and component is few, system structure is simple, therefore
It is at low cost, system reliability is high.It is applicable to the product of multiple constant current driving.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Fig. 2 is the circuit diagram of the utility model embodiment.
Wherein, M1 is detection controllable switch one, and M2 is detection controllable switch two, and Mn is light source for detection controllable switch n, N1
Controllable switch one, N2 are light source controllable switch two, and Nn is light source controllable switch n, and Rn is resistance n, and Dn is light source circuit n；I/On
For I/O mouthfuls of n, U1 is microcontroller, and I/O0 is I/O mouths zero, and I/O1 is I/O mouths one, and I/O2 is I/O mouths two, and I/O3 is I/O mouthfuls
Three；U2 controls chip for single-channel constant current, and It is current detecting foot, and Io is electric current output pin, Ic signal input pins in order to control；K1
For detection transistor one, K2 is detection transistor two, and K3 is detection transistor three, and J1 is light source triode one, and J2 is light source three
Pole pipe two, J3 are light source triode three, and R1 is resistance one, and R2 is resistance two, and R3 is resistance three, and D1 is light source circuit one, and D2 is
Light source circuit two, D3 are light source circuit three, and Out is output interface.
Specific embodiment
With reference to the accompanying drawings and examples, the technical solution of the utility model is described in detail.
As shown in Figure 1, the technical solution adopted in the utility model is：Multichannel light source timesharing constant-current drive circuit, including micro-
Controller, output interface and n light source circuit, n detection resistance, n detection controllable switch, n light source controllable switch and perseverance
Flow control module, each light source circuit and a detection resistance, a detection controllable switch and a light source controllable switch
It corresponds.Wherein, microcontroller is connected respectively with detection controllable switch, light source controllable switch and constant-current control module, constant current
Control module is connected respectively with detection controllable switch, light source controllable switch and detection resistance, detects controllable switch and detection resistance
Connection, light source controllable switch are connected with light source circuit and detection resistance, and light source circuit is connected with output interface, and n is to be more than or wait
In 2 positive integer.
Embodiment
Multichannel light source timesharing constant-current drive circuit in the utility model embodiment, circuit diagram can refer to Fig. 1, including micro-
Controller, output interface and n light source circuit, n detection resistance, n detection controllable switch, n light source controllable switch and perseverance
Flow control module, each light source circuit and a detection resistance, a detection controllable switch and a light source controllable switch
It corresponds.Wherein, microcontroller is connected respectively with detection controllable switch, light source controllable switch and constant-current control module, constant current
Control module is connected respectively with detection controllable switch, light source controllable switch and detection resistance, detects controllable switch and detection resistance
Connection, light source controllable switch are connected with light source circuit and detection resistance, and light source circuit is connected with output interface, and n is to be more than or wait
In 2 positive integer.
Wherein, detect controllable switch and triode or field-effect tube can be used in light source controllable switch, such as detection is controllably opened
It closing using NPN type triode, light source controllable switch uses PNP type triode, wherein, the base stage and microcontroller of NPN type triode
Device connects, and emitter is connected with constant-current control module, and collector is connected with detection resistance, the base stage and micro-control of PNP type triode
Device connection processed, emitter are connected with constant-current control module, and collector is connected with light source circuit, certainly, detect controllable switch and light
Source controllable switch other electronic components with switching function can also be realized by power field effect pipe etc.；Constant-current control module can
Chip is controlled using a single-channel constant current.
Concrete example is as follows：
To detect controllable switch using NPN type triode, exemplified by light source controllable switch uses PNP type triode, and n takes 3,
I.e. using three light source circuits, three detection resistances, three detection controllable switches and three light source controllable switches；It is micro- in this example
Controller module uses microcontroller U1, and constant-current control module is using single-channel constant current control chip U2.
Multichannel light source timesharing constant-current drive circuit, the circuit of embodiment including microcontroller, output as shown in Fig. 2, connect
Mouth and three light source circuits, three detection resistances, three detection controllable switches, three light source controllable switches and current constant control mould
Block, each light source circuit are corresponded with a detection resistance, a detection controllable switch and a light source controllable switch.
Wherein, microcontroller is connected respectively with detection controllable switch, light source controllable switch and constant-current control module, constant-current control module point
It is not connected with detection controllable switch, light source controllable switch and detection resistance, detection controllable switch is connected with detection resistance, and light source can
Control switch is connected with light source circuit and detection resistance, and light source circuit is connected with output interface.
The function of each several part is as follows, and wherein micro controller module needs to realize its work(after adding in corresponding control program
Energy：Micro controller module detects the working condition of controllable switch, light source controllable switch and constant-current control module for controlling；Constant current
Control module is used to detect and regulate and control the electric current in circuit；Detection controllable switch is used to control detection resistance and constant-current control module
Break-make；Light source controllable switch is used to control the break-make of light source circuit and constant-current control module；Detection resistance is electric for providing detection
Stream.
Multichannel light source timesharing constant-current drive circuit, first by microcontroller U1 and three detection controllable switches, three light sources
Controllable switch is connected with current constant control chip U2, and current constant control chip U2 is controllably opened with three detection controllable switches, three light sources
Pass connect with three detection resistances, and each detection controllable switch is connected with corresponding detection resistance, each light source controllable switch and
Corresponding light source circuit is connected with detection resistance.
Specifically, one J1 of base stage and light source triode of one I/O1 of I/O mouths and one K1 of detection transistor of microcontroller U1
Base stage connection, two I/O2 of I/O mouths is connected with the base stage of two J2 of base stage and light source triode of two K2 of detection transistor, I/O mouthfuls
Three I/O3 are connected with the base stage of three J3 of base stage and light source triode of three K3 of detection transistor, and zero I/O0 of I/O mouths is permanent with single channel
The control signal input pin Ic connections of flow control chip U2.The current detecting foot It of single-channel constant current control chip U2 and detection three
The emitter of one K1 of grade pipe, the emitter of two K2 of detection triode are connected with the emitter of detection three K3 of triode, electric current output
Foot Io and one end of one R1 of resistance, one end of two R2 of resistance, one end of three R3 of resistance, emitter, the light of one J1 of light source triode
The emitter of two J2 of source triode is connected with the emitter of three J3 of light source triode.The other end and detection transistor of one R1 of resistance
The collector connection of one K1, the other end of two R2 of resistance are connected with the collector of two K2 of detection transistor, and three R3's of resistance is another
End is connected with the collector of three K3 of detection transistor.One end of one D1 of light source circuit connects with the collector of one J1 of light source triode
It connects, the other end is connected with output interface Out, and one end of two D2 of light source circuit is connected with the collector of two J2 of light source triode, separately
One end is connected with output interface Out, and one end of three D3 of light source circuit is connected with the collector of three J3 of light source triode, the other end with
Output interface Out connections.
In use, microcontroller U1, which adds in corresponding control program, can adjust three detection controllable switches, three light sources
The working condition of controllable switch and single-channel constant current control chip U2.A light source circuit and corresponding current detecting electricity can be controlled
Resistance access system simultaneously turns on its work, such as control one K1 of detection transistor and one J1 of light source triode, other three poles
Pipe all ends, and the current detecting foot It of single-channel constant current control chip U2 realizes that light source returns by the electric current of one R1 of detection resistance
The constant current driving process of one D1 of road；Two and above light source circuit and corresponding current sense resistor can also be accessed simultaneously makes its work
Make, the electric current of the current detecting foot It detections of current constant control chip U2 is the sum of resistor current of all access systems at this time, than
Such as control one K1 of detection transistor, two K2 of detection transistor, three K3 of detection transistor, one J1 of light source triode, light source triode
Two J2 and three J3 of light source triode are simultaneously turned on, and the electric current of the current detecting foot It detections of current constant control chip U2 is resistance one
The sum of electric current of three R3 of R1, two R2 of resistance and resistance.
If it is desired to one D1 of light source circuit with 10% duty cycle, two D2 of light source circuit with 30% duty cycle, light source circuit
Three D3 then allow one I/O1 of I/O mouths to export high level, two I/O2 and I/O mouths of I/O mouths, three I/O3 with 60% duty cycle time-sharing work
Low level is exported, at this time only one K1 of detection transistor and one J1 of light source triode conductings, zero I/O0 of I/O mouths outputs at this time 10%
Duty ratio control single-channel constant current control chip U2 output currents.Similarly only make two K2 of detection transistor and light source triode two
J2 is turned on, the duty cycle of zero I/O0 of I/O mouths outputs at this time 30%.Similarly only make three J3 of three K3 of detection transistor and light source triode
Conducting, the duty cycle of zero I/O0 of I/O mouths outputs at this time 60%.
If it is desired to one D1 of light source circuit and two D2 of light source circuit is simultaneously with 30% duty cycle, three D3 of light source circuit with
70% duty cycle then allows one I/O1 and I/O mouths of I/O mouths, two I/O2 to export high level control detection transistor one simultaneously
K1, two K2 of detection transistor, one J1 of light source triode and two J2 of light source triode conductings, zero I/O0 of I/O mouths outputs at this time 30%
Duty ratio control single-channel constant current control chip U2 output currents.Similarly only make three K3 of detection transistor and light source triode three
J3 is turned on, the duty cycle of zero I/O0 of I/O mouths outputs at this time 70%.
The utility model has reached multichannel light by control of the timesharing to controllable switch and current constant control chip operation state
Source constant current driving and the purpose of Time-sharing control.For the control program that microprocessor U1 needs add in, those skilled in the art's root
It is easy to can be achieved with according to the prior art, therefore it is not the emphasis of the utility model, is no longer described in detail herein, the utility model is only
A kind of concrete structure and connection relation of multichannel light source timesharing constant-current drive circuit are provided.
Claims (6)
1. multichannel light source timesharing constant-current drive circuit, including microcontroller, output interface and n light source circuit, it is characterised in that：
N detection resistance, n detection controllable switch, n light source controllable switch and constant-current control module, each light source is further included to return
Mono- detection resistance of Lu Douyu, a detection controllable switch and a light source controllable switch correspond, the microcontroller point
It is not connected with detection controllable switch, light source controllable switch and constant-current control module, constant-current control module is controllably opened respectively with detection
Pass, light source controllable switch are connected with detection resistance, and detection controllable switch is connected with detection resistance, and light source controllable switch is returned with light source
Road is connected with detection resistance, and light source circuit is connected with output interface, and n is the positive integer more than or equal to 2.
2. multichannel light source timesharing constant-current drive circuit as described in claim 1, it is characterised in that:It is described detection controllable switch and
Light source controllable switch uses triode or field-effect tube.
3. multichannel light source timesharing constant-current drive circuit as claimed in claim 2, it is characterised in that:The detection controllable switch is adopted
With NPN type triode, the base stage of wherein NPN type triode is connected with microcontroller, and emitter is connected with constant-current control module, collection
Electrode is connected with detection resistance.
4. multichannel light source timesharing constant-current drive circuit as claimed in claim 2, it is characterised in that:The light source controllable switch is adopted
With PNP type triode, the base stage of wherein PNP type triode is connected with microcontroller, and emitter is connected with constant-current control module, collection
Electrode is connected with light source circuit.
5. multichannel light source timesharing constant-current drive circuit as described in claim 1, it is characterised in that：The constant-current control module is adopted
Chip is controlled with a single-channel constant current.
6. the multichannel light source timesharing constant-current drive circuit as described in claim 1 or 2 or 3 or 4 or 5, it is characterised in that：The n
Equal to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721515999.9U CN207427534U (en) | 2017-11-14 | 2017-11-14 | Multichannel light source timesharing constant-current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721515999.9U CN207427534U (en) | 2017-11-14 | 2017-11-14 | Multichannel light source timesharing constant-current drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207427534U true CN207427534U (en) | 2018-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721515999.9U Active CN207427534U (en) | 2017-11-14 | 2017-11-14 | Multichannel light source timesharing constant-current drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207427534U (en) |
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2017
- 2017-11-14 CN CN201721515999.9U patent/CN207427534U/en active Active
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