CN205793540U - The three-in-one light adjusting circuit of LED in lamp control system - Google Patents
The three-in-one light adjusting circuit of LED in lamp control system Download PDFInfo
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- CN205793540U CN205793540U CN201620659820.6U CN201620659820U CN205793540U CN 205793540 U CN205793540 U CN 205793540U CN 201620659820 U CN201620659820 U CN 201620659820U CN 205793540 U CN205793540 U CN 205793540U
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Abstract
This utility model provides the three-in-one light adjusting circuit of the LED in a kind of lamp control system, is provided with the output current regulation unit for being adjusted LED current size in lamp control system, and this circuit includes: the voltage follow module being made up of amplifier U107D；Its signal output part is connected to export current regulation unit through diode D300, current reference divider resistance；Its in-phase input end is connected to the anode of diode D302 by R310, receives external dimmer signal between negative electrode and the ground of D302；Anode at diode D302 is also devised with amplifier U108A, and the homophase input accessing U108A by R308, is accessed the output of U108A by R309, and another road homophase input of U108A is provided with reference voltage signal.The three-in-one light adjusting circuit of LED that the utility model proposes can be applicable to three kinds of light-modulating modes, can be prevented effectively from the situation generation that lamp power exceeds the quata.
Description
Technical field
This utility model relates to light fixture and controls technical field, is specifically related in a kind of lamp control system enter LED street lamp
The three-in-one light adjusting circuit of row light modulation.
Background technology
Street lamp, shows the light fixture that road provides illumination functions, refers to the light fixture in the illumination zone of road surface in traffic lighting.With
Science and technology, the development of electron trade and progress, the controller system for LED street lamp becomes complicated all the more, function
Also diversification all the more is become.In lamp control system, civil power obtains after first passing through Active PFC unit boosting (PFC boost)
To higher voltage signal, then become by LLC resonant converter circuit conversion and meet the low-pressure direct that LED street lamp driving requires
Stream electricity.Secondary at the resonance transformer of LLC resonant converter circuit, the most all can access output filter rectification unit, with by humorous
Shake after the secondary induction voltage of transformator carries out rectification and flow to LED street lamp.And the key factor that LED street lamp is normally worked
It is that by constant-current driving.Therefore to stablize the direct current signal after rectification and in order to the voltage/electricity of regulation output
Stream size, is designed with output voltage/electric current regulation unit in a lot of lamp control systems.Once output electric current deviate from default
Voltage/current value, this regulation unit will make LLC resonant converter circuit by feedback, and adjusted to realize constant current permanent
Pressure.
On this basis, in some LED street lamp control, the most also can increase light adjusting circuit to realize LED street lamp
Brightness is adjusted.Present light adjusting circuit has multiple, and light-modulating mode also has a lot, but or be complex circuit designs, or
It is exactly that light-modulating mode is single.The dimmer design of circuit complexity not only increases the complexity of whole LED lamp control system, and
And once break down, detection is got up the most cumbersome.And the dimmer design that light-modulating mode is single, although circuit reduction much,
But selectivity is few, brings significant limitation to Consumer's Experience.It is essential that in some light-modulating mode circuit, often
There will be the situation of lamp power off-rating, serious curtailment service life of street lamp.
Utility model content
For the deficiency in the presence of prior art, this utility model provides the LED tri-in a kind of lamp control system
Unification light adjusting circuit, this circuit can be applicable to three kinds of light-modulating modes, and simplify circuit design, and operational effect is good.
For achieving the above object, this utility model have employed following technical scheme:
The three-in-one light adjusting circuit of LED in a kind of lamp control system, described lamp control system includes for light fixture
The output current regulation unit that size of current is adjusted, described three-in-one light adjusting circuit includes:
The voltage follow module being made up of operational amplifier U107D；
The signal output part of described operational amplifier U107D is connected to current reference divider resistance by diode D300,
And be connected to export current regulation unit by current reference divider resistance；
The in-phase input end of described operational amplifier U107D is connected to the anode of diode D302, institute by resistance R310
Stating and receive external dimmer signal between the negative electrode of diode D302 and ground SGND, described external dimmer signal includes that voltage magnitude is
The pwm signal of 10V, 1-10V voltage signal or 10K-100K dimming resistor；Wherein,
The anode of described diode D302 is connected to the in-phase input end of operational amplifier U108A by resistance R308, with
Using the external dimmer signal of access between negative electrode and the ground SGND of diode D302 as a wherein road of operational amplifier U108A
Homophase inputs；Another road homophase input of described operational amplifier U108A is the reference voltage signal connected by resistance R301
Vref1, described reference voltage signal Vref1 are generated by a reference voltage generation module；The anode of described diode D302
The outfan of operational amplifier U108A it is connected to also by resistance R309；The inverting input of described operational amplifier U108A leads to
Cross resistance R302 ground connection, and between inverting input and outfan, be additionally provided with resistance R303；
Further, the anode of described diode D302 is also by diode D301, stabilivolt ZD301 ground connection, diode D301
Negative electrode be connected with the negative electrode of stabilivolt ZD301, the plus earth of stabilivolt ZD301.
Compared to prior art, this utility model has the advantages that
The three-in-one light adjusting circuit of LED that this utility model provides is applied in lamp control system, by flowing through LED's
The mode that electric current is adjusted makes the luminosity of LED adjusted, and during output electric current big (output 100%), LED lamp is brighter,
During output electric current little (output 10% is even lower), LED lamp is dark.Why this circuit is named as " three-in-one light modulation " circuit,
Reason is that it can be applicable to three kinds of light-modulating modes, i.e. resistance mode, voltage mode and pwm pattern.Therefore, selectivity
More.The most also at the homophase input side of voltage follow module by the way of stabilivolt is set, effectively prevent lamp power
Situation about exceeding the quata occurs.
Accompanying drawing explanation
Fig. 1 is the output filter rectification element circuit schematic diagram of lamp control system described in the utility model；
Fig. 2 is the output current regulation unit schematic diagram of lamp control system described in the utility model；
Fig. 3 is the LED three-in-one light adjusting circuit schematic diagram of lamp control system described in the utility model.
Detailed description of the invention
For the technological means making this utility model realize, creation characteristic, reach purpose and act on more clear and be prone to
Understand, with detailed description of the invention, this utility model be further elaborated below in conjunction with the accompanying drawings:
Before introducing the three-in-one light adjusting circuit of lamp control system described in the utility model, first sketch light fixture control
The output rectification filter unit of system processed and output current regulation unit.
See Fig. 1, which show the output filter rectification element circuit schematic diagram of lamp control system.Can from Fig. 1
Arriving, the signal input part of described output rectification filter unit is connected to T1 level of resonance transformer of LLC resonant converter unit
Winding, it is by the secondary induction electricity of resonance transformer T1 that signal output part VOUT+, VOUT-connect the effect of light fixture, i.e. this unit
Be converted to low-voltage DC after repoussage stream, flow to light fixture.In FIG, output rectification filter unit is by two synchronous rectifications
Two synchronous rectification unit, i.e. U101 and U102 that chip TEA1791A is constituted.Wherein, the synchronous rectification unit that U101 is constituted is
In the positive half cycle work of the alternating current of resonance transformer T1 sensing, the synchronous rectification unit that U102 is constituted is at resonance transformer T1
The negative half period of the alternating current of sensing works, so that the whole cycle of the alternating current of resonance transformer T1 sensing all has rectification defeated
Go out.Extra, the LC resonant network of LLC resonant converter unit is formed in the main winding pin12-pin13 of resonance transformer T1,
LC resonant network prime connects resonance oscillation semi-bridge, and resonance oscillation semi-bridge is controlled by LLC resonance control chip, because it is not belonging to this reality
With novel inventive point, so being introduced the most in detail, the most not carrying out accompanying drawing simultaneously and illustrating.
See Fig. 2, which show the output current regulation unit schematic diagram of lamp control system.This unit is to utilize output
After electric current sequentially passes through current sampling resistor J101 (see Fig. 1), the electric potential difference produced between ground SGND and ground SPGND carries out electricity
Stream adjusts.This electromotive force extent △ U=I*J101.In fig. 2, in-phase input end 10 foot of amplifier U107C is provided with electricity
1., 2. inverting input 9 foot of amplifier U107C is provided with current reference point to stream datum mark, is i.e. provided with two current reference points.
Supply voltage VCC3 is through string equalizing network gained by the secondary accessory power supply winding of resonance transformer T1.Fig. 1-2 does not has
Secondary accessory power supply winding is shown.
Owing to there is electric potential difference because of the existence of resistance J101 between ground SGND and ground SPGND, therefore two current reference points
Voltage swing also can there are differences, and export the biggest electric potential difference of electric current will be the most obvious, the voltage of two current reference points
Size also can become the most obvious.Voltage swing according to two current reference points is at the corresponding electricity of amplifier U107C outfan output
Ordinary mail number, this level signal affects the conducting degree of optocoupler U4, i.e. affects what optocoupler U4 fed back to LLC resonance control chip
Signal.After LLC resonance control chip receives the signal of feedback, will by adjusting switching frequency, make the electric current of light fixture with
Change.As can be seen here, described output current regulation unit is to obtain output to the electric current of light fixture from output rectification filter unit
Signal, and regulate result to LLC resonant converter unit feedback current.The effect of this unit can be not only used for constant lamp current,
The size of current of light fixture can be manually regulated again by adjustable resistance SVR1.
On the basis of the above, the utility model proposes the three-in-one light modulation of the LED in a kind of lamp control system
Circuit, sees Fig. 3.This three-in-one light adjusting circuit includes: the voltage follow module being made up of operational amplifier U107D；
The signal output part of described operational amplifier U107D is connected to current reference divider resistance by diode D300,
And be connected to export current regulation unit by current reference divider resistance；The in-phase input end of operational amplifier U107D passes through
Resistance R310 is connected to the anode of diode D302, receives external dimmer letter between negative electrode and the ground SGND of described diode D302
Number, described external dimmer signal includes that voltage magnitude is the pwm signal of 10V, 1-10V voltage signal or 10K-100K light modulation electricity
Resistance；Wherein, the anode of described diode D302 is connected to the in-phase input end of operational amplifier U108A by resistance R308, with
Using the external dimmer signal of access between negative electrode and the ground SGND of diode D302 as a wherein road of operational amplifier U108A
Homophase inputs；Another road homophase input of described operational amplifier U108A is the reference voltage signal connected by resistance R301
Vref1, described reference voltage signal Vref1 are generated by a reference voltage generation module；The anode of described diode D302
The outfan of operational amplifier U108A it is connected to also by resistance R309；The inverting input of described operational amplifier U108A leads to
Cross resistance R302 ground connection, and between inverting input and outfan, be additionally provided with resistance R303；Further, described diode D302
Anode also by diode D301, stabilivolt ZD301 ground connection, the negative electrode phase of the negative electrode of diode D301 and stabilivolt ZD301
Even, the plus earth of stabilivolt ZD301.
In such scheme, the preferred parameter value of each element is carried out according to the mark in Fig. 3.Wherein, current reference divides
Piezoresistance is in series by resistance R307 and resistance R146, and the output signal of described operational amplifier U107D sequentially passes through resistance
R307 and resistance R146 sends into one of them current reference point of output current regulation unit.Specifically, operational amplifier
The output signal of U107D is to be sent to export the current reference point of current regulation unit 1., sees Fig. 2.
In such scheme, external dimmer signal includes 10V pwm signal, 1-10V voltage signal or is dimmed by 10K-100K
Resistance.Therefore this three-in-one light adjusting circuit is applicable to PWM light-modulating mode, it is possible to is applicable to voltage light-modulating mode, is also applicable to
In resistance light-modulating mode.When accessing dim signal, connect VR1 end in figure 3.The most simultaneously such scheme in
It is essential that be additionally provided with stabilivolt ZD301 at the resistance R310 of amplifier U107D in-phase input end, this stabilivolt ZD301 is to make
For protection device, it is to avoid current reference divider resistance terminal voltage is more than 10V, in order to avoid lamp power exceeds the quata.And at stabilivolt ZD301
Negative electrode and resistance R310 between be also associated with diode D301, its effect is that dim signal is carried out reverse connecting protection.
The operation principle of the three-in-one light adjusting circuit of above-mentioned LED that this utility model is given is as follows:
In conjunction with Fig. 3, when VR1 termination generates the voltage mode light modulation of 1-10V voltage signal or generates the PWM of pwm signal
During pattern light modulation, amplifier U108A is operated in saturation region, and now VR1 end is clamped at V, i.e. NetHLG-1 voltage is V+0.3, warp
Crossing after amplifier U107D follows, the voltage connecting current reference divider resistance end is V+0.3.Now, current regulation unit is exported
Current reference point voltage 1. correspondingly changes, and light fixture just can be followed applied voltage and be dimmed.Due to the pwm signal side of being
Ripple signal, when its dutycycle changes, its voltage effective value V also can change.Here PWM square-wave signal is utilized
Voltage effective value V regulation carries out lamp light-regulating.When voltage mode light modulation or PWM mode dim voltage modulated to 1V, lamp
Tool electric current is with 10% output, dark；When voltage mode dimmer or PWM mode dimmer are by voltage modulated to 10V, lamp current
100% output, brighter.
In conjunction with Fig. 3, when VR1 terminates 10K-100K dimming resistor, the homophase input of amplifier U108A is equivalent to add this
Regulation resistance, changes amplifier positive feedback input, makes amplifier U108A be operated in linear amplification region, therefore through amplifier U108A
After, NetHLG-1 voltage will present 1V-10V linear convergent rate with 10K-100K, and then makes to connect current reference divider resistance
Terminal voltage is the 1-10V with resistive linearity change, and lamp current can export with 10-100%.
In above-mentioned three kinds of light-modulating modes, for voltage light-modulating mode and PWM light-modulating mode, amplifier U108A is operated in
Saturation region, the output signal size of amplifier U107D depends on the voltage swing of VR1 end.For resistance light-modulating mode, amplifier
U108A plays a part resistance signal linear transformation to be voltage signal and inputs the in-phase end to amplifier U107D.
Wherein, described reference voltage generation module includes: go here and there steady unit, its supply voltage VCC3 is generated one stable
Supply voltage Vcc1；Precision voltage regulator TL431, its negative electrode is connected to Vcc1 by resistance R300, controls pole defeated with negative electrode short circuit
Go out reference voltage signal Vref1, plus earth.The steady unit of described string includes: switching tube Q301, and its colelctor electrode is connected to power supply electricity
Pressure VCC3, base stage, by stabilivolt ZD302 ground connection, is provided with resistance R311 between colelctor electrode and base stage, emitter stage passes through electric capacity
C304 ground connection and export described stable supply voltage Vcc1.Therefore, reference voltage V ref1 is 2.5V.Wherein supply voltage
Vcc1 is that amplifier U108A is powered.To ensure that amplifier U108A can steady operation.
When what light modulation of VR1 end does not connects, after the string that supply voltage VCC3 form through Q301 and ZD302 is steady, generation
The Vcc1 voltage of 12.5V.The amplifier input of now U108A output 10V, U107D is 10V, after voltage follow, connects electric current
The voltage of basis point piezoresistance end is then 10V, and light fixture is fully loaded with 100% output.
Regardless of light-modulating mode, when amplifier U107D output signal is applied to current reference divider resistance R307, R146
Time upper, from the circuit of Fig. 2, current reference point voltage 1. in output current regulation unit now can be changed.Work as amplifier
When the voltage (current reference point is 1.) of U107C in-phase input end 10 foot is higher than inverting input 9 foot (current reference point is 2.), amplifier
U107C output level is higher, and optocoupler U4 conducting is affected；Voltage (current reference when amplifier U107C in-phase input end 10 foot
Point 1.) less than inverting input 9 foot (current reference point is 2.) time, amplifier U107C output level is on the low side, optocoupler U4 conducting degree add
Greatly.And the conducting degree of optocoupler U4 affects the current signal feeding back to LLC resonance control chip, now LLC resonance controls core
Switching frequency will be adjusted by sheet according to detection size of current, makes T level of resonance transformer export to the electric current of LED lamp
Change to realize LED light modulation.
For output current regulation unit, when not accessing three-in-one light adjusting circuit described in the utility model, main
It is used for the current constant of LED in some setting value, when actual current is higher compared with the electric current set, by optocoupler U4
Feed back to LLC resonance control chip, and then control actual current is reduced close to setting value；Otherwise in like manner.Therefore three conjunctions are not accessed
LED load electric current is the most only carried out feeding back constant flow regulation by the output current regulation unit majority of one light adjusting circuit.And when output
After current regulation unit has accessed three-in-one light adjusting circuit, just can regulate the size of LED load electric current, realize LED with this
Light modulation.
Finally illustrating, above example is only in order to illustrate the technical solution of the utility model and unrestricted, although ginseng
According to preferred embodiment, this utility model is described in detail, it will be understood by those within the art that, can be to this
The technical scheme of utility model is modified or equivalent, without deviating from objective and the model of technical solutions of the utility model
Enclosing, it all should be contained in the middle of right of the present utility model.
Claims (4)
1. the three-in-one light adjusting circuit of the LED in lamp control system, described lamp control system includes for light fixture electricity
The output current regulation unit that stream size is adjusted, it is characterised in that described three-in-one light adjusting circuit includes:
The voltage follow module being made up of operational amplifier U107D；
The signal output part of described operational amplifier U107D is connected to current reference divider resistance by diode D300, and leads to
Overcurrent basis point piezoresistance is connected to export current regulation unit；
The in-phase input end of described operational amplifier U107D is connected to the anode of diode D302 by resistance R310, and described two
Receiving external dimmer signal between negative electrode and the ground SGND of pole pipe D302, described external dimmer signal includes that voltage magnitude is 10V
Pwm signal, 1-10V voltage signal or 10K-100K dimming resistor；Wherein,
The anode of described diode D302 is connected to the in-phase input end of operational amplifier U108A by resistance R308, with by two
The external dimmer signal accessed between negative electrode and the ground SGND of pole pipe D302 is as a wherein road homophase of operational amplifier U108A
Input；Another road homophase input of described operational amplifier U108A is the reference voltage signal connected by resistance R301
Vref1, described reference voltage signal Vref1 are generated by a reference voltage generation module；The anode of described diode D302
The outfan of operational amplifier U108A it is connected to also by resistance R309；The inverting input of described operational amplifier U108A leads to
Cross resistance R302 ground connection, and between inverting input and outfan, be additionally provided with resistance R303；
Further, the anode of described diode D302 is also by diode D301, stabilivolt ZD301 ground connection, the moon of diode D301
Pole is connected with the negative electrode of stabilivolt ZD301, the plus earth of stabilivolt ZD301.
2. the three-in-one light adjusting circuit of LED in lamp control system as claimed in claim 1, it is characterised in that described benchmark
Voltage generation module includes:
Going here and there steady unit, supply voltage VCC3 is generated a stable supply voltage Vcc1 by it；
Precision voltage regulator TL431, its negative electrode is connected to Vcc1 by resistance R300, controls pole and negative electrode short circuit output reference voltage
Signal Vref1, plus earth.
3. the three-in-one light adjusting circuit of LED in lamp control system as claimed in claim 2, it is characterised in that described string is steady
Unit includes:
Switching tube Q301, its colelctor electrode is connected to supply voltage VCC3, and base stage passes through stabilivolt ZD302 ground connection, colelctor electrode and base
Being provided with resistance R311 between pole, emitter stage is by electric capacity C304 ground connection and exports described stable supply voltage Vcc1.
4. the three-in-one light adjusting circuit of LED in the lamp control system as described in any one of claim 1-3, it is characterised in that
Described current reference divider resistance is in series by resistance R307 and resistance R146, the output letter of described operational amplifier U107D
After diode D300, number sequentially pass through resistance R307 and resistance R146 send into one of them electric current of output current regulation unit
Datum mark.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620659820.6U CN205793540U (en) | 2016-06-28 | 2016-06-28 | The three-in-one light adjusting circuit of LED in lamp control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620659820.6U CN205793540U (en) | 2016-06-28 | 2016-06-28 | The three-in-one light adjusting circuit of LED in lamp control system |
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| Publication Number | Publication Date |
|---|---|
| CN205793540U true CN205793540U (en) | 2016-12-07 |
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| CN201620659820.6U Active CN205793540U (en) | 2016-06-28 | 2016-06-28 | The three-in-one light adjusting circuit of LED in lamp control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107454715A (en) * | 2017-08-04 | 2017-12-08 | 久心医疗科技（苏州）有限公司 | LED self-checking circuits and method for automated external defibrillator |
| CN109922567A (en) * | 2019-03-14 | 2019-06-21 | 欧普照明股份有限公司 | A kind of light adjusting circuit for realizing a variety of dimming modes |
| CN114126142A (en) * | 2021-11-05 | 2022-03-01 | 深圳市瑞晶实业有限公司 | Trinity dimmer circuit of output current precision is adjusted in area |
-
2016
- 2016-06-28 CN CN201620659820.6U patent/CN205793540U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107454715A (en) * | 2017-08-04 | 2017-12-08 | 久心医疗科技（苏州）有限公司 | LED self-checking circuits and method for automated external defibrillator |
| CN109922567A (en) * | 2019-03-14 | 2019-06-21 | 欧普照明股份有限公司 | A kind of light adjusting circuit for realizing a variety of dimming modes |
| CN109922567B (en) * | 2019-03-14 | 2024-03-22 | 欧普照明股份有限公司 | Dimming circuit for realizing multiple dimming modes |
| CN114126142A (en) * | 2021-11-05 | 2022-03-01 | 深圳市瑞晶实业有限公司 | Trinity dimmer circuit of output current precision is adjusted in area |
| CN114126142B (en) * | 2021-11-05 | 2024-02-13 | 深圳市瑞晶实业有限公司 | Three-in-one dimming circuit with output current precision adjustment function |
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| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20170328 Address after: Hongqi Town Jinwan District golden grain road 519090 Guangdong province Zhuhai City No. 2, No. 1 building sixth room 602 Patentee after: Zhuhai Source Electronic Technology Co., Ltd. Address before: Jiang Xi Road 401336 Chongqing Nan'an District No. 11 No. 11-2 A2 second Patentee before: Chongqing Can Yuan Electronics Co., Ltd. |
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| TR01 | Transfer of patent right |