CN106604463B - LED simulator - Google Patents
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- CN106604463B CN106604463B CN201611157362.7A CN201611157362A CN106604463B CN 106604463 B CN106604463 B CN 106604463B CN 201611157362 A CN201611157362 A CN 201611157362A CN 106604463 B CN106604463 B CN 106604463B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The present invention discloses a kind of LED simulator, including positive terminals, negative terminals, pressure stabilizing adjustment pipe, transistor, the first triode, voltage regulation unit and power dissipating unit；The input terminal of power dissipating unit, the first end of first resistor, the first end of second resistance, the input terminal of partial pressure unit and the interconnection of positive terminals, the input terminal interconnection of the output end, the anode and transistor of pressure stabilizing adjustment pipe of power dissipating unit, the collector interconnection of the controlled end of power dissipating unit, the second end of first resistor and the first triode；The input terminal of the base stage of first triode, the second end of second resistance and voltage regulation unit interconnects, and the emitter of the first triode is connect with the cathode of pressure stabilizing adjustment pipe；The adjustment end of adjustment end and partial pressure unit that pressure stabilizing adjusts pipe connects；The output end of transistor, the output end of voltage regulation unit, the output end of partial pressure unit and the interconnection of negative terminals.LED simulator proposed by the present invention being capable of simulated high-pressure lamp bar.
Description
Technical field
The present invention relates to LED simulator technical field, in particular to a kind of LED simulator.
Background technique
Existing LED simulator is as shown in Figure 1.
In LED simulator shown in FIG. 1, positive terminals V+ is used to simulate the anode of LED, and negative terminals V- is for simulating
The cascaded structure of the cathode of LED, pressure stabilizing adjustment pipe and diode composition be used to simulate the voltage of single LED with input current and
The bleeder circuit of the feature of temperature change, cascaded structure cooperation resistance RA and resistance RB composition can simulate the electricity of plurality of LEDs
Pressure is with input current and the feature of temperature change；Transistor is used to simulate the feature of LED consumption power.
However, LED simulator shown in FIG. 1 is limited by the voltage of pressure stabilizing adjustment pipe, cannot simulate more than 30V voltage
Lamp bar.And during using the simulation lamp bar work of LED simulator, the lamp bar voltage for generally requiring simulation it is relatively high (
Between 150V-250V).
Summary of the invention
The main object of the present invention is to provide a kind of LED simulator, it is intended to which solving existing LED simulator cannot simulate
The problem of high pressure lamp bar.
To achieve the above object, LED simulator proposed by the present invention includes positive terminals, negative terminals, pressure stabilizing adjustment
Pipe, transistor, the first triode, first resistor, second resistance, voltage regulation unit, power dissipating unit and partial pressure unit；The function
The input terminal of rate consumable unit, the first end of the first resistor, the first end of the second resistance, the partial pressure unit it is defeated
Enter end and the positive terminals interconnection, the anode and the crystalline substance of the output end of the power dissipating unit, pressure stabilizing adjustment pipe
The input terminal of body pipe interconnects, the controlled end of the power dissipating unit, the second end of the first resistor and the one or three pole
The collector of pipe interconnects；The input of the base stage of first triode, the second end of the second resistance and the voltage regulation unit
The emitter of end interconnection, first triode is connect with the cathode of pressure stabilizing adjustment pipe；The adjustment of the pressure stabilizing adjustment pipe
End is connect with the adjustment end of the partial pressure unit；The output end of the transistor, the output end of the voltage regulation unit, the partial pressure
The output end of unit and the negative terminals interconnection.
Preferably, the transistor is first diode, the anode of the first diode, the power dissipating unit
The anode interconnection of output end and pressure stabilizing adjustment pipe, the cathode of the first diode, the output end of the voltage regulation unit, institute
The output end and the negative terminals for stating partial pressure unit interconnect.
Preferably, the transistor is the second triode, the collector of second triode, second triode
The anode interconnection of base stage, the output end of the power dissipating unit and pressure stabilizing adjustment pipe, the transmitting of second triode
Pole, the output end of the voltage regulation unit, the output end of the partial pressure unit and the negative terminals interconnection.
Preferably, the LED simulator further includes 3rd resistor, the first end of the 3rd resistor and the described 2nd 3
The collector of pole pipe connects, and the second end of the 3rd resistor is connect with the emitter of second triode.
Preferably, the partial pressure unit includes potentiometer, the 4th resistance and the 5th resistance, the input terminal of the potentiometer with
The second end of 4th resistance connects, and the first end of the 4th resistance is the input terminal of the partial pressure unit；The current potential
The adjustment end of device is the adjustment end of the partial pressure unit, the first end company of the output end of the potentiometer and the 5th resistance
It connects, the second end of the 5th resistance is the output end of the partial pressure unit.
Preferably, the partial pressure unit further includes power supply, the first key switch and the second key switch, the current potential
Device is digital regulation resistance, and the digital regulation resistance further includes boosting controlled end, decompression controlled end and power end；The number current potential
The power end of device is connect with the output end of the power supply, the boosting controlled end of the digital regulation resistance and first key
The first end of switch connects, and the second end of first key switch is connect with the negative terminals；The digital regulation resistance
Decompression controlled end is connect with the first end of second key switch, the second end of second key switch and the negative wiring
End connection.
Preferably, the power supply includes voltage-stablizer, the second diode, the second zener diode, first capacitor and
Two capacitors, the anode of second diode are connect with the positive terminals, and the cathode of second diode, described second are surely
Press the input terminal interconnection of the cathode of diode, the first end of the first capacitor and the voltage-stablizer, the output of the voltage-stablizer
End is connect with the first end of second capacitor, and connecting node is the output end of the power supply, and the voltage-stablizer connects
Ground terminal, the anode of second zener diode, the second end of the first capacitor, the second end of second capacitor and described
Negative terminals interconnection.
Preferably, the power supply further includes light emitting diode, third transistor, the 6th resistance and the 7th resistance, institute
The cathode for stating the first end of the 6th resistance, the collector of the third transistor and second diode interconnects, and the described 6th
The base stage of the second end of resistance, the anode of the light emitting diode and the third transistor interconnects, the third transistor
Emitter is connect with the first end of the 7th resistance, the second end of the 7th resistance, the cathode of the light emitting diode, institute
State the input terminal interconnection of the cathode of the second zener diode, the first end of the first capacitor and the voltage-stablizer.
Preferably, the power dissipating unit includes the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, the 4th
Triode, third zener diode and metal-oxide-semiconductor, the emitter of the 4th triode, the first end of the 8th resistance and institute
State the drain interconnection of metal-oxide-semiconductor, connecting node is the input terminal of the power dissipating unit, the base stage of the 4th triode,
The second end of 8th resistance and the first end interconnection of the 9th resistance, the second end of the 9th resistance is the power
The collector of the controlled end of consumable unit, the 4th triode is connect with the first end of the tenth resistance, the tenth electricity
The second end of resistance, the grid of the metal-oxide-semiconductor, the cathode of the first end of the eleventh resistor and the third zener diode are mutual
Even, the anode interconnection of the source electrode of the metal-oxide-semiconductor, the second end of the eleventh resistor and the third zener diode, connects
Connect the output end that node is the power dissipating unit.
Preferably, the power dissipating unit further includes twelfth resistor, the first end of the twelfth resistor with it is described
The source electrode of metal-oxide-semiconductor connects, the second end of the twelfth resistor, the second end of the eleventh resistor and the third pressure stabilizing two
The anode of pole pipe interconnects, and connecting node is the output end of the power dissipating unit.
Preferably, the LED simulator further includes third capacitor, and first end and the power of the third capacitor disappear
Consume the output end connection of unit, the output end of the second end of the third capacitor and the voltage regulation unit, the partial pressure unit
Output end and the negative terminals interconnection.
Technical solution of the present invention guarantees the yin for falling in pressure stabilizing adjustment pipe by the way that voltage regulation unit is arranged in LED simulator
Voltage between pole and anode is no more than 30V, enables LED simulator simulated high-pressure lamp bar, has widened LED simulator
Application range.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the electrical block diagram of LED simulator in the prior art；
Fig. 2 is the electrical block diagram of one embodiment of LED simulator of the present invention；
Fig. 3 is the electrical block diagram of another embodiment of LED simulator of the present invention；
Fig. 4 is the electrical block diagram of the another embodiment of LED simulator of the present invention.
Drawing reference numeral explanation:
| Label | Title | Label | Title | Label | Title |
| 10 | Voltage regulation unit | C1 | First capacitor | R1 | First resistor |
| 20 | Partial pressure unit | C2 | Second capacitor | R2 | Second resistance |
| 30 | Power dissipating unit | C3 | Third capacitor | R3 | 3rd resistor |
| V+ | Positive terminals | Q1 | First triode | R4 | 4th resistance |
| V- | Negative terminals | Q2 | Second triode | R5 | 5th resistance |
| U1 | Pressure stabilizing adjustment pipe | Q3 | Third transistor | R6 | 6th resistance |
| DZ1 | First zener diode | Q4 | 4th triode | R7 | 7th resistance |
| DZ2 | Second zener diode | Qn | Metal-oxide-semiconductor | R8 | 8th resistance |
| DZ3 | Third zener diode | U3 | Voltage-stablizer | R9 | 9th resistance |
| DL | Light emitting diode | U2 | Digital regulation resistance | R10 | Tenth resistance |
| D1 | First diode | K1 | First key switch | R11 | Eleventh resistor |
| D2 | Second diode | K2 | Second key switch | R12 | Twelfth resistor |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if the directional instruction (such as up, down, left, right, before and after ...) of institute in the embodiment of the present invention,
It is only used for explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, such as
When the fruit particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as referring to
Show or imply its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " are defined as a result,
Two " feature can explicitly or implicitly include at least one of the features.In addition, the technical solution between each embodiment can
It to be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution occurs
Conflicting or cannot achieve when, will be understood that the combination of this technical solution is not present, also not the present invention claims protection model
Within enclosing.
The present invention proposes a kind of LED simulator.
Referring to Fig. 2, in one embodiment, LED simulator includes positive terminals V+, negative terminals V-, pressure stabilizing adjustment
Pipe U1, transistor (first diode D1 as shown in Figure 2), the first triode Q1, first resistor R1, second resistance R2, pressure stabilizing
Unit 10, power dissipating unit 30 and partial pressure unit 20；The input terminal of power dissipating unit 30, first resistor R1 first end,
The first end of second resistance R2, the input terminal of partial pressure unit 20 and positive terminals V+ interconnection, the output end of power dissipating unit 30,
Pressure stabilizing adjusts the input terminal interconnection of the anode and transistor of pipe U1, and the of the controlled end of power dissipating unit 30, first resistor R1
The interconnection of the collector of two ends and the first triode Q1；The base stage of first triode Q1, the second end of second resistance R2 and pressure stabilizing list
The emitter of the input terminal interconnection of member 10, the first triode Q1 is connect with the cathode of pressure stabilizing adjustment pipe U1；Pressure stabilizing adjusts pipe U1's
Adjustment end is connect with the adjustment end of partial pressure unit 20；The output end of transistor, the output end of voltage regulation unit 10, partial pressure unit 20
Output end and negative terminals V- interconnection.
It should be noted that it is 2.5V that pressure stabilizing, which adjusts the voltage between the adjustment end and anode of pipe U1, surely in the present embodiment
The pressure stabilizing value of pressure unit 10 can be set in 3.3V between 30V.Here, by the pressure stabilizing value of voltage regulation unit 10 be 27V for into
Row explanation.Voltage between the input terminal and output end of transistor is 0.7V, here, by taking transistor is first diode D1 as an example
It is illustrated.
The positive driving end of the positive terminals V+ of LED simulator and LED drive device (not shown go out) is connect, by LED
The negative terminals V- of simulator and the negative driving end of LED drive device connect, and make LED drive device output driving power supply, LED
Simulator can simulate lamp bar work.
Specifically, in the LED simulator course of work: on the one hand, power dissipating unit 30 can simulate LED consumption function
The feature of rate.On the other hand, the voltage between the adjustment end and anode of pressure stabilizing adjustment pipe U1 is 2.5V, the sun of first diode D1
Voltage between pole and cathode is 0.7V, connect the anode of pressure stabilizing adjustment pipe U1 with the anode of first diode D1, so that it may
Make the voltage 3.2V between pressure stabilizing adjustment pipe U1 adjustment end and first diode D1 cathode.In this way, pressure stabilizing adjustment pipe U1 and the
The cascaded structure of one diode D1 can simulate single LED voltage with input current and the feature of temperature change.
Further, since the voltage between the adjustment end of partial pressure unit 20 and output end is approximate with the pressure drop at single LED both ends,
Therefore, change the parameter of partial pressure Unit 20, so that it may change the voltage between 20 input terminal of partial pressure unit and output end, Ye Jigai
Become the voltage between the positive terminals V+ and negative terminals V- of LED simulator.It is fallen in this way, LED simulator can simulate
Plurality of LEDs voltage is with input current and the feature of temperature change.
It is understood that after the completion of the parameter setting of partial pressure unit 20, LED number that LED simulator is simulated
It is fixed.When the LED that LED simulator is simulated is more than 8, voltage regulation unit 10 stablizes the base voltage of the first triode Q1
In 27V, since the voltage between the base stage and emitter of the first triode Q1 is in 0.7V or so, pressure stabilizing adjusts pipe U1's
Voltage between cathode and anode does not exceed its pressure voltage.In this way, even if the LED that LED simulator is simulated reaches 50,
Voltage (namely the positive terminals V+ and negative terminals V- of LED simulator between the input terminal and output end of partial pressure unit 20
Between voltage) reach 150V, LED simulator can also simulate LED normal work.That is, LED simulator can simulate
High pressure lamp bar.
To sum up, LED simulator proposed by the present invention, can not only simulate single LED, plurality of LEDs, moreover it is possible to simulated high-pressure lamp
Item.Therefore, technical solution of the present invention is able to solve the problem of existing LED simulator is unable to simulated high-pressure lamp bar, has widened LED
The application range of simulator.
Based on an above-mentioned embodiment, referring to Fig. 3, in another embodiment:
First diode D1 is replaced by the second triode Q2, specifically, collector, the second triode of the second triode Q2
The anode interconnection of the base stage of Q2, the output end of power dissipating unit 30 and pressure stabilizing adjustment pipe U1, the emitter of the second triode Q2,
The output end of voltage regulation unit 10, the output end of partial pressure unit 20 and negative terminals V- interconnection.
It should be noted that triode has conductivity modulation effect.So-called conductance modulation exactly flows on triode PN junction
When the forward current crossed is larger, the phenomenon that conductivity increases accordingly.It is special in conjunction with the C-V characteristic of LED and the volt-ampere of diode
Property is it is found that triode PN junction can more approximately simulate the feature that LED voltage changes with input current compared to diode.This
Outside, triode PN junction and LED all have negative temperature coefficient feature, and metal-oxide-semiconductor has ptc characteristics, therefore, compared to
Metal-oxide-semiconductor, triode PN junction can more approximately simulate the feature that LED voltage varies with temperature.
For the degree of approximation for further increasing LED simulator and LED, in the present embodiment, it is also additionally arranged 3rd resistor R3.Tool
Body, the first end of 3rd resistor R3 is connect with the collector of the second triode Q2, the second end of 3rd resistor R3 and the two or three
The emitter of pole pipe Q2 connects.
It is understood that it is different from the material of triode due to constituting LED, when input current is bigger, three
The increase rate of pole pipe PN junction conductivity and LED conductivity is not quite similar.And 3rd resistor R3, compensation triode PN can be played
The effect of the increase rate of junction conduction rate, so that the increase rate of the increase rate of triode PN junction conductivity and LED conductivity
It is approximate.
In addition, it is noted that above-mentioned voltage regulation unit 10 includes the first zener diode DZ1.Specifically, first is steady
Press the anode of diode DZ1 for the input terminal of voltage regulation unit 10, the cathode of the first zener diode DZ1 is the defeated of voltage regulation unit 10
Outlet.It is appreciated that voltage regulation unit 10 can also be realized using other circuit structures, for example, voltage regulation unit 10 includes multiple strings
Join the zener diode of connection.
Based on above-mentioned an embodiment or another embodiment, in another embodiment:
Partial pressure unit 20 includes potentiometer (potentiometer as shown in Figure 4), the 4th resistance R4 and the 5th resistance R5, potentiometer
Input terminal connect with the second end of the 4th resistance R4, the first end of the 4th resistance R4 is the input terminal of partial pressure unit 20；Current potential
The adjustment end of device is the adjustment end of partial pressure unit 20, and the output end of potentiometer is connect with the first end of the 5th resistance R5, the 5th electricity
The second end for hindering R5 is the output end of partial pressure unit 20.
In the present embodiment, it is assumed that the resistance value of potentiometer is RX, and the resistance value of the 4th resistance R4 is R4, the resistance value of the 5th resistance R5
For R5.
If the adjustment end of potentiometer is moved to input terminal, the electricity between the input terminal and output end of partial pressure unit 20
Pressing (voltage i.e. between the positive terminals V+ and negative terminals V- of LED simulator) is 3.2 (RX+R4+R5)/(RX+R5), right
It answers, the LED number of LED simulator simulation is (RX+R4+R5)/(RX+R5)；
If the adjustment end of potentiometer is moved to output end, the electricity between the input terminal and output end of partial pressure unit 20
Pressing (voltage i.e. between the positive terminals V+ and negative terminals V- of LED simulator) is 3.2 (RX+R4+R5)/R5, corresponding,
The LED number of LED simulator simulation is (RX+R4+R5)/R5.
It is appreciated that changing the position of potentiometer adjustment end, so that it may change the input terminal and output end of partial pressure unit 20
Between voltage, and then change LED simulator simulation LED number, and LED simulator simulation LED number in (RX+
R4+R5)/(RX+R5) is between (RX+R4+R5)/R5.
Preferably, above-mentioned potentiometer is digital regulation resistance U2, digital regulation resistance U2 further includes that boosting controlled end is (not shown
Out), be depressured controlled end (not shown go out) and power end (not shown go out), partial pressure unit 20 further include power supply 21, first by
Key switch K1 and the second key switch K2；The power end of digital regulation resistance U2 is connect with the output end of power supply 21, number electricity
The boosting controlled end of position device U2 is connect with the first end of the first key switch K1, the second end and negative wiring of the first key switch K1
Hold V- connection；The decompression controlled end of digital regulation resistance U2 is connect with the first end of the second key switch K2, the second key switch K2
Second end connect with negative terminals V-.
Here, connecting the power end of digital regulation resistance U2 and the output end of power supply 21, digital regulation resistance U2 can
With work.Hereafter, by the first key switch K1, so that it may so that the adjustment end of digital regulation resistance U2 exports extreme direction movement to it,
And then increase the LED number of LED simulator simulation；By the second key switch K2, so that it may so that the adjustment of digital regulation resistance U2
It holds to it and inputs extreme direction movement, and then reduce the LED number of LED simulator simulation, it is very easy.It should be noted that
In general, primary by the first key switch K1 and/or the second key switch K2, the adjustment end of digital regulation resistance U2 is to its output end
And/or input terminal Moving Unit amplitude；Long-pressing the first key switch K1 and/or the second key switch K2, digital regulation resistance U2's
Adjustment end continues mobile to its output end and/or input terminal.And during digital regulation resistance U2 power-off, the tune of digital regulation resistance U2
It does not move at whole end.In addition, digital regulation resistance U2 also has not easy to wear, highly-safe for compared to simulation potentiometer
The characteristics of.
It is noted that digital regulation resistance U2 further includes the bus terminals end (not shown go out) for connecting with computer
And interface terminals (not shown go out).In this way, when needing to adjust digital regulation resistance U2 parameter, by computer to digital current potential
Device U2 burning program can be realized, simple and efficient.
Preferably, above-mentioned power supply 21 includes voltage-stablizer U3, the second diode D2, the second zener diode DZ2, first
Capacitor C1 and the second capacitor C2, the anode of the second diode D2 are connect with positive terminals V+, the cathode of the second diode D2, second
Input terminal (not shown go out) interconnection of the cathode of zener diode DZ2, the first end of first capacitor C1 and voltage-stablizer U3, voltage-stablizer
The output end (not shown go out) of U3 is connect with the first end of the second capacitor C2, connecting node for power supply 21 output end,
Ground terminal (not shown go out), the anode of the second zener diode DZ2, the second end of first capacitor C1, the second electricity of voltage-stablizer U3
Hold the second end and negative terminals V- interconnection of C2.
During LED simulator simulates LED operation: if the digital dimming signal of input is high level, LED driving dress
Output driving power supply is set, then voltage-stablizer U3 obtains input power by the second diode D2, and exports in its output end.It is same with this
When, first capacitor C1 charging.If the digital dimming signal of input is low level, LED drive device not output driving power supply, then surely
Depressor U3 obtains input power by first capacitor C1, and exports in its output end.In the circuit structure, the second zener diode
DZ2 is used to prevent from falling in the overtension of first capacitor C1 first end, to improve the safety of circuit, the second capacitor C2 for pair
The power supply of voltage-stablizer U3 output is filtered.
21 work of power supply is influenced due to the driving power voltage of LED drive device output is widely varied in order to prevent
Make, light emitting diode DL, third transistor Q3, the 6th resistance R6 and the 7th resistance R7 are provided with also in power supply 21.Tool
Body, the cathode interconnection of the first end of the 6th resistance R6, the collector of third transistor Q3 and the second diode D2, the 6th resistance
The base stage of the second end of R6, the anode of light emitting diode DL and third transistor Q3 interconnects, the emitter of third transistor Q3 with
The first end of 7th resistance R7 connects, the second end of the 7th resistance R7, the cathode of light emitting diode DL, the second zener diode
The input terminal of the cathode of DZ2, the first end of first capacitor C1 and voltage-stablizer U3 interconnects.
It is appreciated that being added in the voltage at the 7th both ends resistance R7 because of light emitting diode in 21 course of work of power supply
The fixation of voltage between DL both end voltage and the base stage and emitter of third transistor Q3 and fix.That is, in power supply electricity
In 21 course of work of source, the electric current for flowing through the 7th resistance R7 is fixed, when LED drive device output driving power voltage significantly
When variation, the output of power supply 21 is unaffected.In addition, light emitting diode DL can simulate the indicative character of LED, refer to
Show the state that LED simulator is powered on.
It should be noted that power dissipating unit 30 may include the 8th resistance R8, the 9th in above-mentioned any one embodiment
Resistance R9, the tenth resistance R10, eleventh resistor R11, the 4th triode Q4, third zener diode DZ3 and metal-oxide-semiconductor Qn, the 4th
The drain interconnection of the emitter of triode Q4, the first end of the 8th resistance R8 and metal-oxide-semiconductor Qn, connecting node are power consumption list
The input terminal of member 30, the first end interconnection of the base stage of the 4th triode Q4, the second end of the 8th resistance R8 and the 9th resistance R9, the
The second end of nine resistance R9 is the controlled end of power dissipating unit 30, the collector of the 4th triode Q4 and the tenth resistance R10's
First end connection, the first end and third pressure stabilizing of the second end of the tenth resistance R10, the grid of metal-oxide-semiconductor Qn, eleventh resistor R11
The cathode of diode DZ3 interconnects, the source electrode of metal-oxide-semiconductor Qn, the second end of eleventh resistor R11 and third zener diode DZ3
Anode interconnection, connecting node are the output end of power dissipating unit 30.
Here, metal-oxide-semiconductor Qn conducting, power dissipating unit 30 consumes power when third transistor Q3 conducting.It is worth mentioning
, to avoid the drain current for flowing through metal-oxide-semiconductor Qn excessive, also it is additionally arranged twelfth resistor R12.Specifically, twelfth resistor
The first end of R12 is connect with the source electrode of metal-oxide-semiconductor Qn, the second end of twelfth resistor R12, the second end of eleventh resistor R11 and
The anode of third zener diode DZ3 interconnects, and connecting node is the output end of power dissipating unit 30.
In the LED simulator course of work, when the voltage for falling in metal-oxide-semiconductor Qn grid increases, the leakage of metal-oxide-semiconductor Qn is flowed through
Electrode current increases, and the voltage at the both ends twelfth resistor R12 increases, and the voltage between the grid and source electrode of metal-oxide-semiconductor Qn reduces, and flows through
The drain current of metal-oxide-semiconductor Qn reduces.In this way, twelfth resistor R12 just plays the role of negative-feedback.
In addition, the stability of circuit is improved, also in LED simulator to eliminate the exchange positive feedback of LED simulator
It is additionally arranged third capacitor C3, specifically, the first end of third capacitor C3 is connect with the output end of power dissipating unit 30, third electricity
Hold the second end of C3 and the output end of voltage regulation unit 10, the output end of partial pressure unit 20 and negative terminals V- interconnect.
In the LED simulator course of work, when the electric current for flowing through second resistance R2 increases, flow through first resistor R1's
Electric current increases, and the electric current for flowing through the 8th resistance R8 and the 9th resistance R9 increases, and the electric current for flowing through the 4th triode Q4 increases, and falls in
The voltage at the both ends eleventh resistor R11 increases, and the electric current for flowing through metal-oxide-semiconductor Qn increases, and the electric current for flowing through the second triode Q2 increases,
The electric current for flowing through the first triode Q1 further increases, in this way, being formed regenerative feedback loop.Here, third capacitor C3 can be with
Play the role of bypass, the positive feedback can be eliminated.In addition, third capacitor C3 can also make the second triode Q2 collector and transmitting
Voltage between pole slowly increases, and plays the role of soft start.
Hereinafter, illustrating the working principle of LED simulator of the present invention in conjunction with Fig. 2 to Fig. 4:
The positive driving end of the positive terminals V+ of LED simulator and LED drive device is connected, by LED simulator
The connection of the negative driving end of negative terminals V- and LED drive device, makes LED drive device output driving power supply.
Voltage-stablizer U3 passes through the second diode D2, light emitting diode DL, third transistor Q3, the electricity of the 6th resistance R6 and the 7th
It hinders R7 and obtains input power, and in the working power of its output end output digital regulation resistance U2, digital regulation resistance U2 work once electrified.
At the same time, on the one hand, the first triode Q1 is connected in the driving power of LED simulator output, the 4th triode Q4 is connected,
Metal-oxide-semiconductor Qn conducting, power dissipating unit 30 simulate the feature of LED consumption power.On the other hand, pressure stabilizing adjusts pipe U1, the two or three
Pole pipe Q2 and 3rd resistor R3 simulates single LED voltage with input current and the feature of temperature change, so that falling in digital current potential
The adjustment end voltage of device U2 is approximate with single LED voltage.
Hereafter, if desired change the LED number of LED simulator simulation, then it can be by adjusting the first key switch K1
And second key switch K2 realize.Alternatively, by being realized to digital regulation resistance U2 burning degree.
In whole process, because of the pressure stabilization function of the first zener diode DZ1, even if need LED number to be simulated 50 to
Between 100, need lamp bar voltage to be simulated in 150V between 300V, LED simulator will not be affected.
In this way, LED simulator is achieved that the function of simulated high-pressure lamp bar, and the number of LED can root in lamp bar
It is adjusted according to actual demand.
Technical solution of the present invention has the following beneficial effects:
(1) voltage regulation unit 10 is set, guarantees to fall in the voltage between the cathode and anode of pressure stabilizing adjustment pipe U1 and is no more than
30V, enables LED simulator simulated high-pressure lamp bar, has widened the application range of LED simulator.
(2) first diode D1 is replaced with C-V characteristic and the closer second triode Q2 of LED, enhances LED simulation
The degree of approximation of device and LED.
(3) conductivity that setting 3rd resistor R3 compensates the second triode Q2 increases rate, so that the second triode Q2
PN junction C-V characteristic and the C-V characteristic of LED are further to further enhancing LED simulator and the degree of approximation of LED.
(4) using potentiometer, the 4th resistance R4 and the 5th resistance R5 as partial pressure unit 20, so that LED simulator mould
Quasi- LED number is adjustable, has further widened the application range of LED simulator.
(5) digital regulation resistance U1 is selected, and is correspondingly arranged the first key switch K1 and the second key switch K2, facilitates tune
The number for saving LED simulator simulation LED, avoids the performance that LED simulator is influenced because of potentiometer abrasion.
(6) the digital regulation resistance U2 with bus terminals end and interface terminals is selected, realizes software adjustment number current potential
Device U2 parameter changes the LED number of LED simulator simulation, has further facilitated for adjusting LED simulator simulation LED
Number.
(7) it is arranged between voltage-stablizer U3 and the second diode D2 by light emitting diode DL, third transistor Q3, the 6th electricity
The constant-current circuit for hindering R6 and the 7th resistance R7 composition, the driving power voltage that can prevent LED drive device from exporting is significantly
Change the output to voltage-stablizer U3 and generates interference.
(8) first capacitor C1 is set between the input terminal and ground terminal of voltage-stablizer U3, can be in digital dimming signal
Low level when LED drive device does not have driving power output, avoids the occurrence of voltage-stablizer U3 and stops because that can not obtain input power
The case where exporting the working power of digital regulation resistance U2.
(9) third capacitor C3 is added, the exchange positive feedback in LED simulator can be eliminated, optimize LED simulator
Performance.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all in the present invention
Inventive concept under, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/be used in it indirectly
He is included in scope of patent protection of the invention relevant technical field.
Claims (9)
1. a kind of LED simulator, which is characterized in that adjust pipe, transistor, first including positive terminals, negative terminals, pressure stabilizing
Triode, first resistor, second resistance, voltage regulation unit, power dissipating unit and partial pressure unit；
The input terminal of the power dissipating unit, the first end of the first resistor, the first end of the second resistance, described point
The input terminal and the positive terminals for pressing unit interconnect, the sun of the output end of the power dissipating unit, pressure stabilizing adjustment pipe
The interconnection of the input terminal of pole and the transistor, the controlled end of the power dissipating unit, the second end of the first resistor and institute
State the collector interconnection of the first triode；
The input terminal of the base stage of first triode, the second end of the second resistance and the voltage regulation unit interconnects, described
The emitter of first triode is connect with the cathode of pressure stabilizing adjustment pipe；
The adjustment end of the pressure stabilizing adjustment pipe is connect with the adjustment end of the partial pressure unit；It is the output end of the transistor, described
The output end of voltage regulation unit, the output end of the partial pressure unit and the negative terminals interconnection；
The transistor is first diode, the anode of the first diode, the output end of the power dissipating unit and institute
State the anode interconnection of pressure stabilizing adjustment pipe, the cathode of the first diode, the output end of the voltage regulation unit, the partial pressure unit
Output end and negative terminals interconnection；Alternatively,
The transistor is the second triode, the collector of second triode, the base stage of second triode, the function
The anode interconnection of the output end of rate consumable unit and pressure stabilizing adjustment pipe, the emitter of second triode, the pressure stabilizing
The output end of unit, the output end of the partial pressure unit and the negative terminals interconnection.
2. LED simulator as described in claim 1, which is characterized in that the LED simulator further includes 3rd resistor,
The first end of the 3rd resistor is connect with the collector of second triode, the second end of the 3rd resistor and described the
The emitter of two triodes connects.
3. LED simulator as claimed in claim 1 or 2, which is characterized in that the partial pressure unit includes potentiometer, the 4th
Resistance and the 5th resistance, the input terminal of the potentiometer are connect with the second end of the 4th resistance, and the of the 4th resistance
One end is the input terminal of the partial pressure unit；The adjustment end of the potentiometer is the adjustment end of the partial pressure unit, the current potential
The output end of device is connect with the first end of the 5th resistance, and the second end of the 5th resistance is the output of the partial pressure unit
End.
4. LED simulator as claimed in claim 3, which is characterized in that the partial pressure unit further includes power supply, first
Key switch and the second key switch, the potentiometer be digital regulation resistance, the digital regulation resistance further include boosting controlled end,
It is depressured controlled end and power end；
The power end of the digital regulation resistance is connect with the output end of the power supply, and the boosting of the digital regulation resistance is controlled
End is connect with the first end of first key switch, and the second end of first key switch is connect with the negative terminals；
The decompression controlled end of the digital regulation resistance is connect with the first end of second key switch, and the of second key switch
Two ends are connect with the negative terminals.
5. LED simulator as claimed in claim 4, which is characterized in that the power supply includes voltage-stablizer, the two or two pole
Pipe, the second zener diode, first capacitor and the second capacitor, the anode of second diode are connect with the positive terminals,
The cathode of second diode, the cathode of second zener diode, the first capacitor first end and the pressure stabilizing
The input terminal of device interconnects, and the output end of the voltage-stablizer is connect with the first end of second capacitor, and connecting node is described
The output end of power supply, the ground terminal of the voltage-stablizer, the anode of second zener diode, the first capacitor
Two ends, the second end of second capacitor and the negative terminals interconnect.
6. LED simulator as claimed in claim 5, which is characterized in that the power supply further includes light emitting diode,
Three triodes, the 6th resistance and the 7th resistance, the first end of the 6th resistance, the collector of the third transistor and described
The cathode of second diode interconnects, the second end of the 6th resistance, the anode of the light emitting diode and the three or three pole
The base stage of pipe interconnects, and the emitter of the third transistor is connect with the first end of the 7th resistance, the 7th resistance
Second end, the cathode of the light emitting diode, the cathode of second zener diode, the first end of the first capacitor and institute
State the input terminal interconnection of voltage-stablizer.
7. LED simulator as claimed in claim 1 or 2, which is characterized in that the power dissipating unit includes the 8th electricity
Resistance, the 9th resistance, the tenth resistance, eleventh resistor, the 4th triode, third zener diode and metal-oxide-semiconductor, the four or three pole
The drain interconnection of the emitter of pipe, the first end of the 8th resistance and the metal-oxide-semiconductor, connecting node are the power consumption
The input terminal of unit, base stage, the second end of the 8th resistance and the first end of the 9th resistance of the 4th triode
Interconnection, the second end of the 9th resistance are the controlled end of the power dissipating unit, the collector of the 4th triode with
The first end of tenth resistance connects, the second end of the tenth resistance, the grid of the metal-oxide-semiconductor, the eleventh resistor
First end and the third zener diode cathode interconnection, the second end of the source electrode of the metal-oxide-semiconductor, the eleventh resistor
And the anode interconnection of the third zener diode, connecting node are the output end of the power dissipating unit.
8. LED simulator as claimed in claim 7, which is characterized in that the power dissipating unit further includes the 12nd electricity
Resistance, the first end of the twelfth resistor connect with the source electrode of the metal-oxide-semiconductor, the second end of the twelfth resistor, described the
The interconnection of the anode of the second end of 11 resistance and the third zener diode, connecting node are the power dissipating unit
Output end.
9. LED simulator as claimed in claim 8, which is characterized in that the LED simulator further includes third capacitor,
The first end of the third capacitor is connect with the output end of the power dissipating unit, the second end of the third capacitor with it is described
The output end of voltage regulation unit, the output end of the partial pressure unit and the negative terminals interconnection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611157362.7A CN106604463B (en) | 2016-12-14 | 2016-12-14 | LED simulator |
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|---|---|---|---|
| CN201611157362.7A CN106604463B (en) | 2016-12-14 | 2016-12-14 | LED simulator |
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| CN106604463B true CN106604463B (en) | 2019-05-31 |
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| CN107733219A (en) * | 2017-11-01 | 2018-02-23 | 广州金升阳科技有限公司 | A kind of Switching Power Supply output soft start circuit |
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| CN203574916U (en) * | 2013-12-09 | 2014-04-30 | 深圳市鼎泰佳创科技有限公司 | Led energy-saving electronic load |
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| CN101359038A (en) * | 2007-08-02 | 2009-02-04 | 中茂电子(深圳)有限公司 | Electronic load device capable of simulating LED characteristic and simulation method thereof |
| CN102033146A (en) * | 2009-09-29 | 2011-04-27 | 致茂电子(苏州)有限公司 | Electronic load with light emitting diode simulation characteristic and light emitting diode characteristic simulation method |
| CN102288794A (en) * | 2011-05-12 | 2011-12-21 | 威海东兴电子有限公司 | Electronic load for testing LED (light-emitting diode) driver |
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