CN206923077U - A kind of new regulation LED current circuit - Google Patents

A kind of new regulation LED current circuit Download PDF

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Publication number
CN206923077U
CN206923077U CN201720312782.1U CN201720312782U CN206923077U CN 206923077 U CN206923077 U CN 206923077U CN 201720312782 U CN201720312782 U CN 201720312782U CN 206923077 U CN206923077 U CN 206923077U
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China
Prior art keywords
electronic switch
input
control signal
signal input
control terminal
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CN201720312782.1U
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Chinese (zh)
Inventor
龚逸乐
林铖裕
祁振
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Xiamen Hanyin Electronic Technology Co Ltd
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Xiamen Hanyin Electronic Technology Co Ltd
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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]

Abstract

The utility model provides a kind of new regulation LED current circuit, including power supply, electronic switch, the first current-limiting resistance, the second current-limiting resistance, Light-Emitting Diode, energy storage inductor, filter capacitor, afterflow diode and control signal input；The electronic switch includes control terminal, output end, input；The input of the electronic switch is connected with the power supply；The control terminal of the electronic switch is connected by second current-limiting resistance with the control signal input；The electronic switch output end is connected with the inductance positive terminal, the fly-wheel diode negative pole end respectively, the afterflow diode positive terminal ground connection；The inductance negative pole end is connected with the filter capacitor positive terminal, the first current-limiting resistance positive terminal respectively, the filter capacitor negative pole end ground connection；The light emitting diode positive terminal is connected with the first current-limiting resistance negative pole end, the light emitting diode negative pole ground connection.

Description

A kind of new regulation LED current circuit
Technical field
It the utility model is related to electronic circuit field, more particularly to a kind of new regulation LED current circuit.
Background technology
LED light emitting source long lifespans, efficiency high, energy consumption are low.What current LED power supply modes used mostly is all to pass through city Electricity, exchange is then converted into by direct current by rectifier bridge again.Conventional mode is to utilize special LED light modulating devices regulation LED Brightness.But this special light modulating device is complicated and cost is higher, while special light modulating device is for exchange mostly Input voltage and design, DC voltage input light modulating device it is seldom, which adds the cost of LED drive circuit.
Utility model content
The purpose of this utility model is to overcome the shortcomings of the prior art, there is provided a kind of new regulation LED lamp currents Circuit, including power supply, electronic switch, the first current-limiting resistance, the second current-limiting resistance, Light-Emitting Diode, energy storage inductor, filtered electrical Hold, afterflow diode and control signal input；
The electronic switch includes control terminal, output end, input；
The input of the electronic switch is connected with the power supply；
The control terminal of the electronic switch is connected by second current-limiting resistance with the control signal input；
The electronic switch output end is connected with the inductance positive terminal, the fly-wheel diode negative pole end respectively, institute State afterflow diode positive terminal ground connection；
The inductance negative pole end is connected with the filter capacitor positive terminal, the first current-limiting resistance positive terminal respectively, The filter capacitor negative pole end ground connection；
The light emitting diode positive terminal is connected with the first current-limiting resistance negative pole end, the light emitting diode negative pole Ground connection.
The utility model can also be further perfect by following technical measures：
As a further improvement, the electronic switch is PNP triode, the control terminal is base stage, and the input is Emitter stage, the output end are colelctor electrode, and the control signal input is connected with the control terminal base stage.
As a further improvement, the electronic switch is P-channel metal-oxide-semiconductor；The control terminal is grid, and the input is Source electrode；The output end is drain electrode, the control signal input and the control terminal grid
As a further improvement, the electronic switch is NPN triodes, the control terminal is base stage, and the input is Emitter stage, the output end are colelctor electrode, and the control signal input is connected with the control terminal base stage.
As a further improvement, the electronic switch is N-channel MOS pipe；The control terminal is grid, and the input is Source electrode；The output end is drain electrode, and the control signal input is connected with the control terminal grid.
As a further improvement, the control signal input is controlled using pwm pulse width signal.
As a further improvement, the control signal input is pwm circuit or I/O mouths.
As a further improvement, the diode is fly-wheel diode, preferably Schottky diode.
As a further improvement, the calculating of the energy storage inductor voltage output voltage and the electric current of LED 1 Formula is：
VO=[VDD-VCE(SAT)] * (1-D)
ILED=(VO-VF)/R1
The VO is the inductance output voltage；The VCE(SAT)E poles and the saturation voltage of C interpolars for triode Q1； The D is PWM duty cycle；The VF is LED forward conduction voltage.
Compared with prior art, the utility model has advantages below：The utility model provides a kind of new regulation LED Lamp current circuit, controlled using PWM, according to the height adjusting brightness of LED lamps of PWM duties, controlled with the potentiometer typically used Lamp brightness is compared, and efficiency improves, and there is very high precision to adjust.
Brief description of the drawings
Fig. 1 is a kind of new regulation LED current circuit schematic diagram of the utility model.
Main element symbol description
Power vd D
Voltage output end VO
Electronic switch Q1
Electronic switch Q1 control terminal b
Electronic switch Q1 input e
Electronic switch Q1 output end c
Inductance L1
Afterflow diode D1
Filter capacitor C1
First current-limiting resistance R1
Second current-limiting resistance R2
LED
Pwm control signal input：10
Embodiment
To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with this practicality Accompanying drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
, it is necessary to illustrate in description of the present utility model, herein, such as first and second or the like relation Term is used merely to make a distinction an entity or operation with another entity or operation, and not necessarily requires or imply Any this actual relation or order be present between these entities or operation.Moreover, term " including ", " including " or its Any other variant is intended to including for nonexcludability so that process, method, article including a series of elements or Equipment not only includes those key elements, but also the other element including being not expressly set out, or also include for this process, Method, article or the intrinsic key element of equipment.In the absence of more restrictions." included one by sentence ... and limited Fixed key element, it is not excluded that in addition identical also be present in the process including the key element, method, article or equipment will Element ".
As shown in figure 1, a kind of new regulation LED current circuit in the present embodiment, including power vd D, electronic switch Q1, First current-limiting resistance R1, the second current-limiting resistance R2, Light-Emitting Diode LED1, inductance L1, filter capacitor C1, afterflow diode D1 And pwm control signal input 10；
The electronic switch is PNP type triode；
The electronic switch Q1 includes control terminal b, output end c, input e；
The input e of the electronic switch Q1 is connected with the power vd D；
The control terminal b of the electronic switch Q1 passes through the second current-limiting resistance R2 and the phase of control signal input 10 Connection；
The output end of the electronic switch Q1 respectively the positive terminal with the inductance L1, the sustained diode 1 it is negative Extremely it is connected, the positive terminal ground connection of the afterflow diode D1；
The positive terminal with the filter capacitor C1, the first current-limiting resistance R1 be just respectively for the negative pole end of the inductance L1 Extremely it is connected, the negative pole end ground connection of the filter capacitor C1；
The second current-limiting resistance effect of being connected before the control terminal b of the electronic switch Q1 is to prevent signal source from overloading, Also so that the control terminal b current works of the PNP type triode Q1 are within allowed band, it is ensured that the PNP triode Q1 and The reliability and stability of integrated circuit work.
The first current-limiting resistance R1, it is connected on before the LED 1, effect has been antihypertensive effect, is prevented Supply voltage is higher than LED voltage, causes light emitting diode to burn out.
When inputting different PWM duty cycle signals in pwm control signal input 10, after driving the circuit, in the electricity Pressure output end VO can export different DC voltages, obtain the electric current of the different LEDs 1.
When the electronic switch Q1 is low level, the electronic switch Q1 conductings, the inductance L1 is magnetized, and flows through institute It is linearly increasing to state inductance L1 electric current, while is charged to the filter capacitor C1, energy is provided to the LED 1.
When the electronic switch Q1 is high level, the electronic switch Q1 disconnects, and the inductance L1 passes through the afterflow Diode D1 is discharged, and the electric current of the inductance L1 is linearly reduced, and the voltage of the voltage output end VO depends on output filter capacitor C1 Electric discharge and the less inductance L1 electric current maintain.
The calculation formula of the output voltage of the voltage output end VO and the electric current of LED 1 is：
Vo=[VDD-VCE(SAT)] * (1-D)
ILED=(VO-VF)/R1
VCE(SAT)：Triode Q1 E poles and the saturation voltage of C interpolars
D：PWM duty cycle；
VF：LED forward conduction voltage
The voltage and electric current of the LED can according to actual conditions type selecting,
LED1 Vf=1.6V@If=20mA
The second current-limiting resistance R2 spans are 510 Ω -3.3K, preferably 1K, for making the electronic switch Q1 It is operated in amplification region or saturation region.
The frequency range of pwm control signal input 10 is that 10K-1Mhz is preferably 100Khz, for exporting on an equal basis In the case of effect, frequency is faster, L1 and C1 values can be cost-effective with smaller.
The energy storage inductor L1 spans are 1uH~100uH, are preferably, 47uH, user can be according to oneself to ripple Requirement, according to inductance formula L=U*dt/di, select different size of inductance, inductance value is bigger, and ripple is smaller.
The filter capacitor C1 values are 0.1uF-10uF, preferably 1uF, to be actually to work in view of the circuit Under DCDC discontinuous mode, therefore C1 is bigger, and output voltage Vo is more stable, and ripple is smaller.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model Within the spirit and principle of utility model, any modification, equivalent substitution and improvements done etc., the utility model should be included in Within the scope of protection.

Claims (9)

  1. A kind of 1. new regulation LED current circuit, it is characterised in that：Including power supply, electronic switch, the first current-limiting resistance, Two current-limiting resistances, Light-Emitting Diode, energy storage inductor, filter capacitor, afterflow diode and control signal input；
    The electronic switch includes control terminal, output end, input；
    The input of the electronic switch is connected with the power supply；
    The control terminal of the electronic switch is connected by second current-limiting resistance with the control signal input；
    The electronic switch output end is connected with the inductance positive terminal, the fly-wheel diode negative pole end respectively, described continuous Flow diode positive terminal ground connection；
    The inductance negative pole end is connected with the filter capacitor positive terminal, the first current-limiting resistance positive terminal respectively, described Filter capacitor negative pole end is grounded；
    The light emitting diode positive terminal is connected with the first current-limiting resistance negative pole end, and the light emitting diode negative pole connects Ground.
  2. 2. new regulation LED current circuit according to claim 1, it is characterised in that：The electronic switch is PNP tri- Pole pipe, the control terminal are base stage, and the input is emitter stage, and the output end is colelctor electrode, the control signal input The control terminal base stage is held to connect.
  3. 3. new regulation LED current circuit according to claim 1, it is characterised in that：The electronic switch is P-channel Metal-oxide-semiconductor；The control terminal is grid, and the input is source electrode；The output end for drain electrode, the control signal input with The control terminal grid connection.
  4. 4. new regulation LED current circuit according to claim 1, it is characterised in that：The electronic switch is NPN tri- Level pipe, the control terminal is base stage, and the input is emitter stage, and the output end is colelctor electrode, the control signal input End is connected with the control terminal base stage.
  5. 5. new regulation LED current circuit according to claim 1, it is characterised in that：The electronic switch is N-channel Metal-oxide-semiconductor；The control terminal is grid, and the input is source electrode；The output end for drain electrode, the control signal input with The control terminal grid connection.
  6. 6. new regulation LED current circuit according to claim 1, it is characterised in that：The control signal input Controlled using pwm pulse width signal.
  7. 7. new regulation LED current circuit according to claim 1, it is characterised in that：The control signal input For pwm circuit or I/O mouths.
  8. 8. new regulation LED current circuit according to claim 1, it is characterised in that：The diode is afterflow two Pole pipe, it is Schottky diode.
  9. 9. new regulation LED current circuit according to claim 2, it is characterised in that：The energy storage inductor voltage is defeated The calculation formula for going out voltage and the electric current of LED 1 is：
    VO=[VDD-VCE(SAT)] * (1-D)
    ILED=(VO-VF)/R1
    The VO is the inductance output voltage；The VCE(SAT)E poles and the saturation voltage of C interpolars for triode Q1；The D For PWM duty cycle；The VF is LED forward conduction voltage.
CN201720312782.1U 2017-03-28 2017-03-28 A kind of new regulation LED current circuit Active CN206923077U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720312782.1U CN206923077U (en) 2017-03-28 2017-03-28 A kind of new regulation LED current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720312782.1U CN206923077U (en) 2017-03-28 2017-03-28 A kind of new regulation LED current circuit

Publications (1)

Publication Number Publication Date
CN206923077U true CN206923077U (en) 2018-01-23

Family

ID=61310676

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201720312782.1U Active CN206923077U (en) 2017-03-28 2017-03-28 A kind of new regulation LED current circuit

Country Status (1)

Country Link
CN (1) CN206923077U (en)

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