CN207399565U - A kind of control circuit of light emitting diode - Google Patents
A kind of control circuit of light emitting diode Download PDFInfo
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- CN207399565U CN207399565U CN201721346926.1U CN201721346926U CN207399565U CN 207399565 U CN207399565 U CN 207399565U CN 201721346926 U CN201721346926 U CN 201721346926U CN 207399565 U CN207399565 U CN 207399565U
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Abstract
The utility model embodiment discloses a kind of control circuit of light emitting diode, it can be applied at least one set of light emitting diode, the control circuit includes booster circuit, processor, and the constant-current circuit being correspondingly arranged at least one set of light emitting diode, it is to meet the voltage signal of LEDs ON requirement to carry out boost conversion to the DC power supply of input by booster circuit, and the voltage signal that the reference signal and light emitting diode exported by constant-current circuit according to processor exports, control the break-make of light emitting diode, and processor can detect the quality of one group of light emitting diode according to the current signal that the voltage signal and constant-current circuit that light emitting diode exports are fed back.A kind of control circuit for light emitting diode that the utility model embodiment provides can be controlled to the luminous of light emitting diode on the premise of being driven to light emitting diode and the luminescence display uniformity of each group light emitting diode is detected.
Description
Technical field
The utility model embodiment is related to field of circuit technology more particularly to a kind of control circuit of light emitting diode.
Background technology
Light emitting diode (Light Emitting Diode, LED) is due to having efficient, energy-saving and environmental protection, long lifespan, body
The features such as product is small, and it is widely used in the fields such as various instructions, display, decoration, backlight, general lighting and urban landscape.
With the development of display technology, LED more and more application for the displays such as mobile phone, tablet, TV backlight,
To be used for showing the various information such as word, figure, image, animation, market, video, video signal.Wherein, believe in light-emitting diode display
Breath shows that the quality of picture is influenced by the optical characteristics and electrology characteristic of LED.But LED is the semiconductor devices of characteristic sensitivity,
And with negative temperature characteristic, thus need to stablize its working condition in application process and it is reasonably protected.It is logical
Ensure that the electric current in circuit is no more than the maximum rating of LED conducting electric currents frequently with constant current-supplying.Existing constant current driving side
Case combines specific feedback circuit usually using linear or switching mode DC/DC voltage-stablizers, and constant current-supplying is provided for LED.
Although in the prior art, there is corresponding backlight driving chip and various constant-current control circuits to the driving of LED,
It is that can not be detected during driving for LED, can not ensures the uniformity that LED is shown, and then influences the display effect of LED
Fruit.
Utility model content
In view of this, the utility model embodiment provides a kind of control circuit of light emitting diode, can drive luminous
Diode carries out display and shines, and the display emission uniformity of the lamp group of multiple light emitting diodes composition is detected.
The utility model embodiment provides a kind of control circuit of light emitting diode, applied at least one set of light-emitting diodes
Pipe, the control circuit include：Booster circuit, processor and at least one set of light emitting diode corresponding at least one
A constant-current circuit；
The power supply signal input of the booster circuit is electrically connected with DC power supply and output terminal and the light-emitting diodes
The input terminal electrical connection of pipe, for carrying out boost conversion to the DC power supply of input；
The first input end of the constant-current circuit is electrically connected with the output terminal of the light emitting diode, the second input terminal and institute
State the reference signal output terminal electrical connection of processor and the load current input terminal of load current feedback end and the processor
Electrical connection for receiving the voltage signal of the light emitting diode output, and feeds back corresponding load current to the processor
Signal；
The load voltage input terminal of the processor is electrically connected with the output terminal of the light emitting diode, described for receiving
The load voltage signal of light emitting diode output, and the reference signal of the light emitting diode is inputted to the constant-current circuit, with
And receive the load current signal of the constant-current circuit feedback.
Optionally, the boost current test side of the processor is electrically connected with the current signal feedback end of the booster circuit
It connects, boost voltage test side is electrically connected with the voltage signal feedback end of the booster circuit and control signal output and institute
The control terminal electrical connection of booster circuit is stated, for receiving the boost current and boost voltage of booster circuit feedback, and according to
The boost current and the boost voltage control boost conversion of the booster circuit to the DC power supply.
Optionally, the booster circuit includes：Boost control chip, inductance, the first metal-oxide-semiconductor, Schottky diode, electricity
Appearance, first resistor, second resistance and 3rd resistor；
The first end of the inductance be electrically connected with the DC power supply and second end and the Schottky diode the
One end is electrically connected, and the second end of the Schottky diode is electrically connected with the input terminal of the light emitting diode；
The control terminal of first metal-oxide-semiconductor is electrically connected with the control signal output of the boost control chip, the first electricity
Pole is electrically connected with the second end of the inductance and second electrode is grounded by the first resistor；
The first end of the capacitance is electrically connected with the second end of the Schottky diode and second end ground connection；
The first end of the second resistance is electrically connected with the second end of the Schottky diode and second end passes through institute
State 3rd resistor ground connection；
The voltage signal feedback end of the boost control chip is electrically connected with the second end of the second resistance and electric current
Signal feedback end is electrically connected with the second electrode of first metal-oxide-semiconductor, for the power supply voltage signal according to feedback and power supply electricity
Signal is flowed, corresponding conducting voltage is inputted to the control terminal of first metal-oxide-semiconductor.
Optionally, first metal-oxide-semiconductor is N-channel MOS pipe.
Optionally, the constant-current circuit includes：Operational amplifier, the second metal-oxide-semiconductor and the 4th resistance；
The control terminal of second metal-oxide-semiconductor is electrically connected with the output terminal of the operational amplifier, first electrode and the hair
The output terminal electrical connection of optical diode and second electrode are electrically connected with the load current input terminal of the processor；
The in-phase input end of the operational amplifier is electrically connected with the reference signal output terminal of the processor, anti-phase input
End is electrically connected with the second electrode of second metal-oxide-semiconductor；
The first end of 4th resistance is electrically connected with the second electrode of second metal-oxide-semiconductor and second end ground connection.
Optionally, second metal-oxide-semiconductor is N-channel MOS pipe.
Optionally, the control circuit be applied to multi-group light-emitting diode, correspondingly, the control circuit include with it is multigroup
The corresponding multiple constant-current circuits of the light emitting diode；
The electrical connection corresponding with the output terminal of light emitting diode described in each group of the first input end of each constant-current circuit, the
Two input terminals be electrically connected with the reference signal output terminal of the processor and load current feedback end and the processor it is negative
Current input terminal electrical connection is carried, for receiving the reference signal that the processor is sent, and is fed back accordingly to the processor
Load current；
Correspondingly, the load voltage input terminal of the processor is electrically connected with the output terminal of light emitting diode described in each group,
For receiving the load voltage that light emitting diode described in each group exports respectively.
Optionally, the control circuit further includes display unit；
The input terminal of the display unit is electrically connected with the signal output part of shown processor, described for showing and storing
The load current signal that processor receives.
Optionally, the display unit includes at least one of charactron, display screen.
Optionally, the control circuit further includes communication unit；
The first end of the communication unit is connected to the processor and second end is connected with host computer, in institute
It states and is communicated between processor and the host computer.
A kind of control circuit for light emitting diode that the utility model embodiment provides can be applied at least one set of shine
Diode, the control circuit include booster circuit, processor and the Constant Electric Current being correspondingly arranged at least one set of light emitting diode
Road, it is to meet the voltage letter of LEDs ON requirement to carry out boost conversion to the DC power supply of input by booster circuit
Number, and the voltage signal that the reference signal and light emitting diode exported by constant-current circuit according to processor exports, control shine
The break-make of diode, and the current signal that processor can be fed back according to the voltage signal and constant-current circuit that light emitting diode exports
The quality of one group of light emitting diode is detected, the driving circuit for solving light emitting diode in the prior art can not be to its luminescence display
Performance be detected, so as to can not ensure light emitting diode display consistency the technical issues of, compared with it is existing shine
The driving circuit of diode, can be on the premise of driving light emitting diode turns it on constant current hold, to light-emitting diodes
The luminescence display characteristic of pipe is detected and controls, to judge the whether abnormal technique effect of the luminescence display of light emitting diode.
Description of the drawings
Fig. 1 is a kind of structure diagram of the control circuit for light emitting diode that the utility model embodiment provides；
Fig. 2 is the structure diagram of the control circuit for another light emitting diode that the utility model embodiment provides；
Fig. 3 is that a kind of structure for control circuit applied to multi-group light-emitting diode that the utility model embodiment provides is shown
It is intended to；
Fig. 4 is the structure diagram of the control circuit for another light emitting diode that the utility model embodiment provides；
Fig. 5 is a kind of physical circuit figure of the control circuit for light emitting diode that the utility model embodiment provides.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant with the utility model rather than entire infrastructure are illustrated only for ease of description, in attached drawing.Do not conflicting
In the case of, the feature in the utility model embodiment and embodiment can be mutually combined.
Embodiment one
A kind of control circuit of light emitting diode provided in this embodiment can be adapted for driving diode displaying hair
Light, and to application scenarios that its luminescence display is detected.Fig. 1 is a kind of light emitting diode that the utility model embodiment provides
Control circuit structure diagram.Shown in Figure 1, the control circuit of light emitting diode provided in this embodiment can be applied to
At least one set of light emitting diode D, the control circuit 100 include：It booster circuit 10, processor 20 and shines at least one set
The corresponding at least one constant-current circuits 30 of diode D.
It should be noted that the control circuit for the light emitting diode that the utility model embodiment provides can be applied at least one
Group light emitting diode, and each group of light emitting diode corresponds to a constant-current circuit, and in Fig. 1 one is corresponded to one group of light emitting diode
Exemplified by a constant-current circuit, one group of light emitting diode is illustratively substituted with a light emitting diode.But in one group of light emitting diode
The number and connection mode of light emitting diode can be set according to actual needs, not limited herein.
As shown in Figure 1, in the control circuit for the light emitting diode that the utility model embodiment provides, the electricity of booster circuit 10
Source signal input terminal is electrically connected with DC power supply VDD, and the input terminal of the output terminal and light emitting diode D of booster circuit 10 is electrically connected
It connects, for carrying out boost conversion to the DC power supply VDD of input；The first input end of constant-current circuit 30 is with light emitting diode D's
Output terminal is electrically connected, and the second input terminal of constant-current circuit 30 is electrically connected with the reference signal output terminal of processor 20, constant-current circuit
30 load current feedback end is electrically connected with the load current input terminal of processor 20, for receiving light emitting diode D outputs
Voltage signal, and feed back corresponding load current signal to processor 20；The load voltage input terminal of processor 20 and luminous two
The output terminal electrical connection of pole pipe D, for receiving the load voltage signal of light emitting diode D outputs, and inputs to constant-current circuit 30
The reference signal of light emitting diode D and the load current signal for receiving the feedback of constant-current circuit 30.
Illustratively, light emitting diode (Light-Emitting-Diode, LED) is a kind of using electroluminescence, can
The semiconductor of luminous energy is converted electrical energy into, there is the high and low radiation of long lifespan, light efficiency, low-power consumption, and is widely used
In presentation of information, signal lamp, Vehicular lamp, display backlight source, general illumination.Particularly in presentation of information such as word, images
The application of aspect is especially prominent, correspondingly, to ensure the quality using presentation of information such as light emitting diode progress word, images,
Need light emitting diode that there is stabilized illumination performance and display consistency.And lumination of light emitting diode performance and its conducting voltage and
Electric current has close relationship, i.e., when forward voltage is just less than its on state threshold voltage, flows through the electric current pole of light emitting diode
Small, the light emitting diode does not shine at this time；And after voltage is more than on state threshold voltage, forward current increases sharply with voltage,
So that display of the lumination of light emitting diode into row information.Therefore, the control of the conducting voltage for light emitting diode and electric current is
So that the premise of its stabilized illumination.
As shown in Figure 1, the control circuit 100 for the light emitting diode that the utility model embodiment provides uses booster circuit 10
Light emitting diode D is inputted after carrying out boost conversion to the DC power supply VDD of input so that the DC power supply VDD after boost conversion
Meet the conducting lighting requirements of light emitting diode D；And the output voltage and processor 20 of light emitting diode D generates light-emitting diodes
The luminous reference signal of pipe D inputs constant-current circuit 30 respectively, and the voltage signal that constant-current circuit 30 is exported according to light emitting diode D
Its conducting electric current signal is detected, and compared with the reference signal that processor 20 exports, to control the conducting of constant-current circuit 30
With cut-off, and then the break-make of light emitting diode D is controlled.Further, since the voltage that the quality of one group of light emitting diode is exported with it
Light emitting diode D related to current signal, thus that the light emitting diode D voltage signals exported and constant-current circuit are detected
The equal input processor 20 of current signal in so that processor 20 can be according to the voltage signal and current signal to light-emitting diodes
The quality of pipe is detected.Meanwhile processor 20 judges light emitting diode D by detecting the voltage signal and current signal
Current display luminance, and occur breaking or during short circuit in light emitting diode D, disconnect the constant current output of constant-current circuit 30.
The control circuit for the light emitting diode that the utility model embodiment provides, by booster circuit to the direct current of input
It is to meet the voltage signal of LEDs ON requirement that source, which carries out boost conversion, and exported by constant-current circuit according to processor
Reference signal and the voltage signal of light emitting diode output control the break-make of light emitting diode, and processor can be according to hair
The voltage signal of optical diode output and the current signal of constant-current circuit feedback detect the quality of one group of light emitting diode, so as to
Enough on the premise of being driven to light emitting diode, the luminescence display characteristic of light emitting diode is detected and controlled.
Embodiment two
The present embodiment is optimized on the basis of above-described embodiment, with further on the basis of above-described embodiment it is right
In the control circuit of light emitting diode booster circuit convert DC power supply voltage signal and current signal by processor into
Row detection, further such that the power supply of input light emitting diode meets the conducting requirement of light emitting diode.Fig. 2 is the utility model
The structure diagram of the control circuit for another light emitting diode that embodiment provides.As shown in Fig. 2, the utility model embodiment
The control circuit 100 of the light emitting diode of offer is applied at least one set of light emitting diode, which includes：Boosting
Circuit 10, processor 20 and at least one constant-current circuit 30 corresponding at least one set light emitting diode D.Wherein, locate
The boost current test side of reason device 20 is electrically connected with the current signal feedback end of booster circuit 10, the boost voltage inspection of processor 20
It surveys end to be electrically connected with the voltage signal feedback end of booster circuit 10, control signal output and the booster circuit 10 of processor 20
Control terminal is electrically connected, for receiving the boost current and boost voltage of the feedback of booster circuit 10, and according to the boost current and liter
The voltage-controlled booster circuit 10 processed of piezoelectricity is to the boost conversion of DC power supply VDD.
Illustratively so that LEDs ON and luminous voltage signal must be over its threshold voltage, thus, it needs
The supply voltage and electric current for inputting light emitting diode are detected, judge whether it meets what LEDs ON shone
Electric signal.As shown in Fig. 2, after the utility model embodiment to DC power supply VDD by booster circuit 10 by carrying out boost conversion
Power supply voltage signal and the equal input processor 20 of power current signal so that processor 20 can be according to the power supply voltage signal
With conversion of the power current signal control booster circuit 10 to DC power supply VDD.For example, when processor 20 detects supply voltage
When signal and power current signal are insufficient to allow light emitting diode D conductings or reach the breakdown voltage signal of light emitting diode D, place
Reason device 20 is sent so that booster circuit 10 is adjusted to the control signal of DC power supply VDD conversions or occurred in light emitting diode D
When short circuit or broken string, processor 20 controls booster circuit 10 to disconnect the connection with light emitting diode D.
Optionally, on the basis of above-described embodiment, the control electricity for the light emitting diode that the utility model embodiment provides
Road can be applied to multi-group light-emitting diode, correspondingly, multi-group light-emitting diode corresponds to multiple constant-current circuits.Fig. 3 is that this practicality is new
A kind of structure diagram for control circuit applied to multi-group light-emitting diode that type embodiment provides.As shown in figure 3, luminous two
The application of control circuit 100 and the multi-group light-emitting diode D1~Dn of pole pipe, and the control circuit 100 has and two pole of multi-group light-emitting
Multiple 31~3n of constant-current circuit that pipe D1~Dn is correspondingly arranged.Wherein, the first input end of multiple 31~3n of constant-current circuit with it is more
The output terminal of group light emitting diode D1~Dn corresponds to electrical connection, the second input terminal and the processor 20 of multiple 31~3n of constant-current circuit
The electrical connection of reference signal output terminal, the load current feedback end of multiple 31~3n of constant-current circuit and the load current of processor 20
Input terminal is electrically connected, and for receiving the reference signal that processor 20 is sent, and feeds back corresponding load current to processor 20；Phase
It answers, the load voltage input terminal of processor 20 is electrically connected with the output terminal of multi-group light-emitting diode D1~Dn, for connecing respectively
Receive the load voltage of multi-group light-emitting diode D1~Dn outputs.
It should be noted that the control circuit for the light emitting diode that the utility model embodiment provides is applied to multi-group light-emitting
Diode D1~Dn, wherein, light emitting diode D1~Dn represent respectively light emitting diode group D1, light emitting diode group D2 ..., hair
Optical diode group Dn, correspondingly, being represented with multiple 31~3n of constant-current circuit that multi-group light-emitting diode group D1~Dn is correspondingly arranged
Constant-current circuit 31, constant-current circuit 32 ..., constant-current circuit 3n.
Illustratively, usually needed when carrying out word, image when presentation of information using multiple light emitting diodes, Duo Gefa
Optical diode can form multiple LED light strings, i.e. multi-group light-emitting diode.And each group is sent out in multi-group light-emitting diode
The emission uniformity of optical diode will impact the effect of presentation of information.As shown in figure 3, the utility model embodiment carries
The control circuit 100 of the light emitting diode of confession is applied to multi-group light-emitting diode, and the boosted circuits 10 of DC power supply VDD are converted
After can respectively input in multi-group light-emitting diode D1~Dn, correspondingly, each group light emitting diode D1~Dn output load electricity
Pressure signal inputs corresponding 31~3n of constant-current circuit respectively, and from processor 20 to each 31~3n of constant-current circuit inputs pair
The reference signal answered so that each 31~3n of constant-current circuit loads electricity to the electric current that is actually turned on of light emitting diode D1~Dn
Stream is detected, and compared with the reference signal that processor 20 inputs, judges corresponding light emitting diode D1~Dn conductings
Performance, with the break-make according to conduction property control each group light emitting diode D1~Dn.Meanwhile processor 20 receives each group respectively
The load current signal that the load voltage signal and 31~3n of constant-current circuit of light emitting diode D1~Dn outputs are detected, with root
Judge whether each group light emitting diode D1~Dn shines consistent with load current signal according to the load voltage signal.
For example, when light emitting diode group D1 breaks down, load voltage signal and load current signal can with it is normal
Load voltage signal and load current signal during conducting can control light emitting diode by constant-current circuit 31 at this time there are gap
Group D1 open circuits, to implement to protect to it.Correspondingly, the load voltage that processor 20 can also be exported according to light emitting diode group D1 is believed
Number and the load current signal that detects of constant-current circuit 31, judge that light emitting diode group D1 does not meet the luminous uniformity of display.
Optionally, on the basis of above-described embodiment, the control electricity for the light emitting diode that the utility model embodiment provides
Road can also include display unit.Fig. 4 is the control circuit for another light emitting diode that the utility model embodiment provides
Structure diagram.As shown in figure 4, the display unit of the control circuit 100 for the light emitting diode that the utility model embodiment provides
40 are electrically connected with the signal output part of processor 20, for showing and storing the load current signal of the reception of processor 20, so that
Light emitting diode D is actually turned on electric current and can intuitively be shown by display unit 40.The display unit 40 can be
Specific restriction is not done in the combination of one or more of charactron, display screen etc. herein.
Optionally, with continued reference to shown in Fig. 4, the control circuit 100 of the light emitting diode can also include communication unit 50,
50 first end of communication unit is connected with processor 20, the second end and external equipment of communication unit 50, such as can be upper
Machine 60 connects, and for being communicated between processor 20 and host computer 60, which can be wireless communication or direct telecommunications
Number communication, and the communication unit 50 can be the PORT COM that carries of processor 20.By communication unit 50 by processor 20
It is attached with host computer, the electric signal that processor 20 receives can be uploaded in host computer 60 and be handled, shown and deposited
Storage, simultaneous processor 20 can also receive the control instruction transmitted by host computer 60 by communication unit 50, with according to the control
Instruction exports corresponding reference signal.
The control circuit for the light emitting diode that the utility model embodiment provides receives booster circuit by using processor
The power current signal and power supply voltage signal of feedback control boost conversion of the booster circuit to DC power supply, so that
Power supply signal in input light emitting diode more meets the lighting requirements of light emitting diode, can further realize to luminous two
Pole tube light-emitting performance is controlled.
Embodiment three
The present embodiment is embodied on the basis of above-described embodiment, i.e., is provided on the basis of above-described embodiment
The specific component and its connection relation of each circuit, so as to illustratively state the specific control process of the control circuit.Fig. 5 is
A kind of physical circuit figure of the control circuit for light emitting diode that the utility model embodiment provides.With reference to shown in Fig. 1 and Fig. 5,
The control circuit 100 of light emitting diode can be applied at least one set of light emitting diode, and the booster circuit 10 of the control circuit 100 wraps
It includes：Boost control chip IC, inductance L, the first metal-oxide-semiconductor Q1, Schottky diode SD, capacitance C, first resistor R1, second resistance
R2 and 3rd resistor R3.
Wherein, the first end of inductance L is electrically connected with DC power supply VDD, and the second end of inductance L is with Schottky diode SD's
First end is electrically connected, and the second end of Schottky diode SD is electrically connected with the input terminal of light emitting diode D；First metal-oxide-semiconductor Q1's
Control terminal is electrically connected with the control signal output of boost control chip IC, and the of the first electrode of the first metal-oxide-semiconductor Q1 and inductance L
Two ends are electrically connected, and the second electrode of the first metal-oxide-semiconductor Q1 is grounded by first resistor R1；The first end of capacitance C and two pole of Schottky
The second end electrical connection of pipe SD and the second end ground connection of capacitance C；The first end of second resistance R2 is with Schottky diode SD's
Second end is electrically connected, and the second end of second resistance R2 is grounded by 3rd resistor R3；The voltage signal of boost control chip IC is anti-
Feedback end is electrically connected with the second end of second resistance R2, the current signal feedback end of boost control chip IC and the first metal-oxide-semiconductor Q1's
Second electrode is electrically connected, for the power supply voltage signal and power current signal according to feedback, to the control terminal of the first metal-oxide-semiconductor Q1
Input corresponding conducting voltage.Optionally, the first metal-oxide-semiconductor Q1 can be N-channel MOS pipe.
Illustratively, as shown in figure 5, by the first metal-oxide-semiconductor Q1 for exemplified by N-channel MOS pipe.DC power supply VDD is inputted first
Boost conversion is carried out in the inductance L of booster circuit 10, and the electric signal that inductance L is exported inputs the drain electrode of the first NMOS tube Q1,
And inspection stream is carried out through first resistor R1 after the source electrode output of the first metal-oxide-semiconductor Q1, to control the total current in booster circuit 10, prevent
Only overcurrent damage boost control chip IC, meanwhile, it will examine flowing as a result, i.e. power supply voltage signal input boost control chip IC
In.In addition, the electric signal of inductance L outputs inputs second resistance R2 after being filtered in Schottky diode SD input capacitances C
It is formed with 3rd resistor R3 in voltage feedback circuit, it is after second resistance R2 and 3rd resistor R3 partial pressures that power supply voltage signal is anti-
Feed boost control chip IC, so that the benchmark that boost control chip will store in source voltage signal and boost control chip IC
Voltage signal is compared, and the conducting and shut-off of the first metal-oxide-semiconductor Q1 are controlled according to comparative result, so as to fulfill booster circuit 10
To being inputted after the reasonable conversion of DC power supply VDD in light emitting diode D.
Continuing with reference to shown in figure 1 and Fig. 5, constant-current circuit 30 includes operational amplifier U, second metal-oxide-semiconductor Q2, Yi Ji
Four resistance R4.Wherein, the control terminal of the second metal-oxide-semiconductor Q2 is electrically connected with the output terminal of operational amplifier U, and the of the second metal-oxide-semiconductor Q2
One electrode is electrically connected with the output terminal of light emitting diode D, and the second electrode and the load current of processor 20 of the second metal-oxide-semiconductor Q2 is defeated
Enter end electrical connection；The in-phase input end of operational amplifier U is electrically connected with the reference signal output terminal of processor 20, operational amplifier
The inverting input of U is electrically connected with the second electrode of the second metal-oxide-semiconductor Q2；The first end of 4th resistance R4 is with the second metal-oxide-semiconductor Q2's
Second electrode is electrically connected and the second end of the 4th resistance R4 ground connection.Optionally, the second metal-oxide-semiconductor Q2 can be N-channel MOS pipe.
Illustratively, as shown in figure 5, by the second metal-oxide-semiconductor Q2 for exemplified by N-channel MOS pipe.It is exported by light emitting diode D
Load voltage signal is inputted to the drain electrode of the second metal-oxide-semiconductor Q2, and the source electrode through the second metal-oxide-semiconductor Q2 inputs the 4th resistance R4, so that
4th resistance R4 carries out the voltage signal that light emitting diode D is exported inspection stream, and by the inspection stream signal, i.e. load current signal is defeated
Enter the inverting input of operational amplifier U, while operational amplifier U in-phase input ends receive the benchmark exported by processor 20 and believe
Number, so that after operational amplifier U is compared load current signal and reference signal, export to the grid of the second metal-oxide-semiconductor Q2
Pole, so that the second metal-oxide-semiconductor Q2 controls its conducting degree according to the signal of operational amplifier U outputs, so as to change light emitting diode D
In conducting electric current.
It should be noted that it is similar with above-mentioned technical principle and process for the control realization of multi-group light-emitting diode,
Details are not described herein.
The control circuit for the light emitting diode that the utility model embodiment provides, by the way that booster circuit and control circuit are had
Body is specifically described the control and detection process of at least one set of light emitting diode, so as to meet light-emitting diodes
The lighting requirements of pipe and the display consistency of light emitting diode is detected and controlled.
Note that it above are only the preferred embodiment of the utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious variation is readjusted and substituted without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, other more equivalent embodiments can also be included, and the scope of the utility model is by appended
Right determine.
Claims (10)
1. a kind of control circuit of light emitting diode, applied at least one set of light emitting diode, which is characterized in that including：Boosting
Circuit, processor and at least one constant-current circuit corresponding at least one set light emitting diode；
The power supply signal input of the booster circuit is electrically connected with DC power supply and output terminal and the light emitting diode
Input terminal is electrically connected, for carrying out boost conversion to the DC power supply of input；
The first input end of the constant-current circuit is electrically connected with the output terminal of the light emitting diode, the second input terminal and the place
The reference signal output terminal electrical connection of reason device and load current feedback end and the load current input terminal of the processor are electrically connected
It connects, for receiving the voltage signal of the light emitting diode output, and corresponding load current signal is fed back to the processor；
The load voltage input terminal of the processor is electrically connected with the output terminal of the light emitting diode, for receiving described shine
The load voltage signal of diode output, and input to the constant-current circuit reference signal of the light emitting diode, Yi Jijie
Receive the load current signal of the constant-current circuit feedback.
2. control circuit according to claim 1, which is characterized in that the boost current test side of the processor with it is described
The electrical connection of current signal feedback end, boost voltage test side and the voltage signal feedback end electricity of the booster circuit of booster circuit
Connection and control signal output are electrically connected with the control terminal of the booster circuit, for receiving the booster circuit feedback
Boost current and boost voltage, and the booster circuit is controlled to described straight according to the boost current and the boost voltage
The boost conversion in galvanic electricity source.
3. control circuit according to claim 1, which is characterized in that the booster circuit includes：Boost control chip, electricity
Sense, the first metal-oxide-semiconductor, Schottky diode, capacitance, first resistor, second resistance and 3rd resistor；
The first end of the inductance is electrically connected with the DC power supply and the first end of second end and the Schottky diode
Electrical connection, the second end of the Schottky diode are electrically connected with the input terminal of the light emitting diode；
The control terminal of first metal-oxide-semiconductor is electrically connected with the control signal output of the boost control chip, first electrode with
The second end electrical connection of the inductance and second electrode are grounded by the first resistor；
The first end of the capacitance is electrically connected with the second end of the Schottky diode and second end ground connection；
The first end of the second resistance is electrically connected with the second end of the Schottky diode and second end is by described
Three resistance eutral groundings；
The voltage signal feedback end of the boost control chip is electrically connected with the second end of the second resistance and current signal
Feedback end is electrically connected with the second electrode of first metal-oxide-semiconductor, is believed for the power supply voltage signal according to feedback and source current
Number, input corresponding conducting voltage to the control terminal of first metal-oxide-semiconductor.
4. control circuit according to claim 3, which is characterized in that first metal-oxide-semiconductor is N-channel MOS pipe.
5. control circuit according to claim 1, which is characterized in that the constant-current circuit includes：Operational amplifier, second
Metal-oxide-semiconductor and the 4th resistance；
The control terminal of second metal-oxide-semiconductor is electrically connected with the output terminal of the operational amplifier, first electrode and described luminous two
The output terminal electrical connection of pole pipe and second electrode are electrically connected with the load current input terminal of the processor；
The in-phase input end of the operational amplifier is electrically connected with the reference signal output terminal of the processor, inverting input with
The second electrode electrical connection of second metal-oxide-semiconductor；
The first end of 4th resistance is electrically connected with the second electrode of second metal-oxide-semiconductor and second end ground connection.
6. control circuit according to claim 5, which is characterized in that second metal-oxide-semiconductor is N-channel MOS pipe.
7. control circuit according to claim 1 or 2, applied to multi-group light-emitting diode, which is characterized in that the control
Circuit includes multiple constant-current circuits corresponding with multigroup light emitting diode；
It is the electrical connection corresponding with the output terminal of light emitting diode described in each group of the first input end of each constant-current circuit, second defeated
Enter that end be electrically connected with the reference signal output terminal of the processor and the load of load current feedback end and the processor is electric
Input terminal electrical connection is flowed, for receiving the reference signal that the processor is sent, and corresponding load is fed back to the processor
Electric current；
Correspondingly, the load voltage input terminal of the processor is electrically connected with the output terminal of light emitting diode described in each group, it is used for
The load voltage of light emitting diode output described in each group is received respectively.
8. according to claim 1~6 any one of them control circuit, which is characterized in that further include display unit；
The input terminal of the display unit is electrically connected with the signal output part of the processor, for showing and storing the processing
The load current signal that device receives.
9. control circuit according to claim 8, which is characterized in that the display unit is included in charactron, display screen
At least one.
10. according to claim 1~6 any one of them control circuit, which is characterized in that further include communication unit；
The first end of the communication unit is connected to the processor and second end is connected with host computer, at the place
It is communicated between reason device and the host computer.
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| CN201721346926.1U CN207399565U (en) | 2017-10-19 | 2017-10-19 | A kind of control circuit of light emitting diode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151775A (en) * | 2016-12-05 | 2018-06-12 | 株式会社三丰 | The light source of encoder and encoder |
| CN110234186A (en) * | 2019-03-06 | 2019-09-13 | 北京宏大天成防务装备科技有限公司 | A kind of lighting system applied to several scenes |
| CN112233625A (en) * | 2020-10-16 | 2021-01-15 | Tcl华星光电技术有限公司 | Backlight constant-current control circuit and backlight structure |
| CN114184928A (en) * | 2021-11-24 | 2022-03-15 | 深圳同兴达科技股份有限公司 | Performance detection system and detection method for Schottky diode in display module |
-
2017
- 2017-10-19 CN CN201721346926.1U patent/CN207399565U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151775A (en) * | 2016-12-05 | 2018-06-12 | 株式会社三丰 | The light source of encoder and encoder |
| CN108151775B (en) * | 2016-12-05 | 2022-01-25 | 株式会社三丰 | Encoder and light source of encoder |
| CN110234186A (en) * | 2019-03-06 | 2019-09-13 | 北京宏大天成防务装备科技有限公司 | A kind of lighting system applied to several scenes |
| CN112233625A (en) * | 2020-10-16 | 2021-01-15 | Tcl华星光电技术有限公司 | Backlight constant-current control circuit and backlight structure |
| CN114184928A (en) * | 2021-11-24 | 2022-03-15 | 深圳同兴达科技股份有限公司 | Performance detection system and detection method for Schottky diode in display module |
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