CN102316632B - Multiple light modulation input circuit - Google Patents
Multiple light modulation input circuit Download PDFInfo
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- CN102316632B CN102316632B CN201110134408.4A CN201110134408A CN102316632B CN 102316632 B CN102316632 B CN 102316632B CN 201110134408 A CN201110134408 A CN 201110134408A CN 102316632 B CN102316632 B CN 102316632B
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Abstract
The invention provides a multiple dimming input circuit, which is used for generating analog voltage to output to a dimming driving circuit; the multi-dimming input circuit comprises an input end, an output end, a constant current source, a voltage adjusting unit and a filtering unit.
Description
Technical field
The present invention relates to a kind of multi-dimming circuit, refer in particular to a kind of dimming input circuit with multiple input pattern.
Background technology
At present, lighting becomes daily necessities, can provide light at night, or as index, security warning etc. purposes.Along with socio-economic development, no matter nowadays big city is all day and night that brilliantly illuminated, a large amount of lighting device causes burden to supply of electric power gradually.
Lighting is generally often use under being fixed on most high energy consumption maximum brightness, no matter number of users is how many, use why, surrounding environment light and shade.Therefore can bring a lot of energy wastes, lose bulb life and produce more used heat.
Recently, most energy-saving lamp can arrange in pairs or groups light adjusting controller change output brightness.User is by controlling light adjusting controller, and lighting can provide different intensity level schemes according to the demand of user.But, due to manufacturer is different or circuit design consider difference, the output signal of light adjusting controller also has various different output specification.
Simultaneously because of above-mentioned different types of light adjusting controller, dimming driving circuit often needs the different circuit In-put design of corresponding adjustment, just can receive different types of input control signal, thus drive light emitting source (as LED) with different Electric Design, light adjusting controller cannot lose efficacy or cause circuit damage make time corresponding dimming function with the drive circuit on light fixture.
Summary of the invention
For solving the problem, the invention provides a kind of dimming input circuit with multiple input pattern.
For realizing object of the present invention, multi-dimming input circuit provided by the invention, comprising:
One input, lotus root is connected to an input node;
One output, exports for transmitting described analog voltage;
One constant current source, lotus root is connected to described input node;
One voltage-adjusting unit, lotus root is connected between described input node and an earth terminal, described voltage-adjusting unit comprises a long-pending diode of receiving, when described input inputs described pulse-width modulation signal, described voltage-adjusting unit is used for the voltage max process of described pulse-width modulation signal to the described long-pending breakdown voltage receiving diode;
One filter unit, lotus root is connected between described input node and an earth terminal, and described filter unit comprises a filter resistance and a filter capacitor, and described filter resistance lotus root is connected between described input node and described output slow-action unit; One end of described filter capacitor is electrically connected between described filter resistance and described output slow-action unit, and the other end of described filter unit is electrically connected an earth terminal;
And one exports slow-action unit, lotus root is connected between described filter unit and described output, and described output slow-action unit comprises an operational amplifier; Described operational amplifier forms a voltage with lotus root device;
Wherein, when described input inputs an analog voltage input, described analog voltage exports the voltage quasi position being proportional to the input of described analog voltage; When described input inputs a pulse-width modulation signal, described analog voltage exports the duty ratio being proportional to described pulse-width modulation signal; When between described input and an earth terminal, lotus root connects a variable resistor, described analog voltage exports and is proportional to a described variable-resistance resistance, when between described input and an earth terminal, lotus root connects described variable resistor, described constant current source produces certain electric current, describedly determines electric current by described variable resistor form a variable input voltage on described input.
Further, when described input inputs described pulse-width modulation signal, described filter unit carries out filtering to described pulse-width modulation signal, and produces the described analog voltage output being proportional to the duty ratio of described pulse-width modulation signal.
Further, comprise a current-limiting resistance and an input filter capacitor further, described current-limiting resistance lotus root is connected between described input and described input node; One end of described input filter capacitor is electrically connected between described input and described current-limiting resistance, and the other end of described filter capacitor is electrically connected to an earth terminal.
Further, the capacitance of described input filter capacitor is 1000pF.
Further, comprise a light further and turn off unit, one end lotus root that described light turns off unit is connected between described filter unit and described output slow-action unit.
Further, described light shutoff unit other end lotus root is connected between a feedback circuit and a system voltage end, when the voltage quasi position of described input is less than a fiducial value; Described light turns off unit and is turned off by described feedback circuit.
A kind of multi-dimming input circuit provided by the invention, by polytype (as analog voltage input, pulse-width modulation signal, variable resistor) input signal, be converted to analog voltage export, using the brightness adjustment control signal as dimming driving circuit on light fixture.Further, the analog voltage analogy of output must be linear and be proportional to the resistance value of the input voltage of analog voltage input, the duty ratio of pulse width modulation signal or variable resistor resistance.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of a kind of multi-dimming input circuit of the present invention;
Accompanying drawing 2 be the corresponding analog voltage input of multi-dimming input circuit of the present invention or pulse-width modulation signal time circuit diagram;
Circuit diagram when accompanying drawing 3 is multi-dimming input circuit corresponding variable resistance of the present invention;
Accompanying drawing 4 is that constant current source determines current characteristics simulation drawing respectively under different variable resistor resistance;
Accompanying drawing 5A is the experimental result picture of relative analog voltage output relation under variable resistor or analog voltage input pattern;
Accompanying drawing 5B is the experimental result picture of relative analog voltage output relation under passive pulse-width modulation signal pattern;
Accompanying drawing 5C is the experimental result picture of relative analog voltage output relation under pulse-width modulation signal pattern;
Accompanying drawing 5D is the experimental result picture of relative analog voltage output relation under another pulse-width modulation signal pattern.
Component symbol explanation;
Multi-dimming input circuit 100; Constant current source 120; Voltage-regulating circuit 140;
Filter unit 160; Export slow-action unit 180; Light turns off unit 190;
Feedback circuit 200; Input node N1; Input IN1;
Output OUT1; Analog voltage input Va; Pulse-width modulation signal Vpwm;
System voltage end Vdd; Reference voltage end Vref; Operational amplifier OP1;
Filter resistance R1; Filter capacitor C1; Current-limiting resistance R2;
Input filter capacitor C2; Variable resistor Ra; Determine electric current I c.
Embodiment
Content for a better understanding of the present invention, below in conjunction with accompanying drawing, the present invention is further described.
Because manufacturer is different or considering of circuit design is differed, the output signal of light adjusting controller also has various different output specification on the market.The signal that controls of light adjusting controller generation common at present is mainly divided into following three kinds:
(1) analog voltage input:
Be generally the analog voltage input of 1V ~ 10V (or 0v ~ 10v), the size of voltage quasi position is utilized to represent different intensity levels, due to output signal be also adopt analogical pattern, therefore input according to 1 ~ 10V input, circuit only need do amplify or decay, slow-action.There is no too large problem in design;
(2) pulse-width modulation signal:
Be generally the PWM signal between 12v ~ 24V, utilize PWM input signal take up space with difference and represent different intensity levels than (duty cycle).When adopting PWM signal input signal, analog voltage exports the duty ratio that must be proportional to PWM input signal, and RC filter therefore can be adopted to be anaiog signal by the filter of PWM input signal.The PWM input signal of existing light adjusting controller adopts the system of 12 ~ 24V, therefore must get rid of the impact of its voltage quasi position of PWM input signal according to resistance-capacitance filtering; And
(3) directly variable resistor adjustment:
Adopt adjustable variable resistance, utilize the resistance of variable resistance to represent different intensity levels, this mode, for directly connecting a variable resistor (being generally 100k ohm, lienar for), does not need extra, power supply just can light modulation.General conventional electric resistance partial pressure mode designs, but along with variable resistor resistance difference, the output of analogy power supply presents non-linear, and lamplight brightness change can be caused also to present non-linear.
Therefore, the present invention proposes a kind of multi-dimming input circuit, and the object of its design is, by polytype input signal, is converted to linear analog voltage and exports, using the brightness adjustment control signal as dimming driving circuit on light fixture.
Referring to the 1st figure, is a kind of schematic diagram of multi-dimming input circuit 100.As shown in Figure 1, multi-dimming input circuit 100 comprises input IN1, output OUT1/ constant current source 120, voltage-adjusting unit 140, filter unit 160 and exports slow-action unit 180.In addition, light can be comprised further turn off unit 190 in the multi-dimming input circuit 100 of this implementation column, but the present invention is not as limit.
As shown in Figure 1, input IN1 lotus root is connected to input node N1. output OUT1 transmission analog voltage and exports follow-up dimming driving circuit (not shown) to.Constant current source 120 lotus root is connected to input node N1.Lotus root is connected between input node N1 and earth terminal voltage-adjusting unit 140.Lotus root is connected between input node N1 and earth terminal filter unit 160.Export slow-action unit 180 lotus root to be connected between filter unit 160 and output OUT1.One end lotus root that light turns off unit 190 is connected to filter unit 160 and exports between slow-action unit 180, and light turns off unit 190 other end lotus root and is connected between feedback circuit 200 and system voltage end Vcc.
Seeing also the 2nd figure, is circuit diagram during multiple light input circuit 100 corresponding analog voltage input Va or pulse-width modulation signal Vpwm.
As shown in Figure 2, in this implementation column, export slow-action unit 180 and comprise an operational amplifier OP1, in this implementation column, operational amplifier OP1 mainly in order to coating-forming voltage with lotus root device as the use exporting slow-action.
Preferably, filter unit 160 comprises filter resistance R1 and filter capacitor C1, filter resistance R1 lotus root is connected to input node N1 and exports between slow-action unit 180, one end of filter capacitor C1 is electrically connected at filter resistance R1 and exports between slow-action unit 180, and the other end of filter capacitor C1 is electrically connected to earth terminal.
Preferably, in this implementation column, voltage-adjusting unit 140 comprises long-pending diode 9 (zener diode) of receiving, and breakdown voltage can be adopted in this implementation column to be the long-pending diode of receiving of 11V.
Preferably, in this implementation column, multi-dimming input circuit 100 comprises a current-limiting resistance R2 and input filter capacitor C2 further, current-limiting resistance R2 lotus root is connected between input IN1 and input node N1, one end of input filter capacitor C2 is electrically connected between input IN1 and current-limiting resistance R2, and the other end of filter capacitor C2 is electrically connected to earth terminal, in practical application, input filter capacitor C2 mono-capacitance roughly can be about 1000pF, but the present invention is not as limit.
When input IN1 connect be analog voltage input Va (as 1 ~ 10V determine voltage input) time, now, the voltage quasi position of input node N1 can be promoted to the voltage quasi position that analog voltage inputs Va by the analog voltage input Va that direct current determines voltage, process through exporting the gain (uni-gain) that waits of operational amplifier OP1 in slow-action unit 180 subsequently, and formation exports output OUT1 to through analog voltage.That is, it is equal that the analog voltage output on the output OUT1 in this implementation column inputs Va with former analog voltage haply, and thus, analog voltage exports the voltage quasi position being namely proportional to analog voltage input Va.
When input IN1 connect be pulse-width modulation signal Vpwm (PWM as 12 ~ 24V inputs) time, now pulse-width modulation signal Vpwm to receive in voltage-adjusting unit 140 long-pending breakdown voltage (the being 11V in the column) restriction receiving diode, the signal voltage of pulse-width modulation signal Vpwm is first through voltage-adjusting unit 140 (namely in this implementation column, breakdown voltage is the long-pending diode of receiving of 11V) process to about 11V, again via the RC filter that filter resistance R1 in filter unit 160 and filter capacitor C1 forms, the analog voltage being converted into the duty ratio (duty cycle) being proportional to pulse-width modulation exports.
In addition, please participate in the 3rd figure, be circuit diagram during multiple dimming input circuit 100 corresponding variable resistance Ra.As shown in Figure 3, between input IN1 and earth terminal, lotus root meets variable resistor Ra.
When input IN1 lotus root meets variable resistor Ra, the analog voltage produced to adopt electric resistance partial pressure mode in prior art is come in and gone out and the resistance of variable resistor Ra presents nonlinear problem.The present invention carries out voltage sampling by constant current source 120 corresponding variable resistance Ra, what constant current source 120 produced determine electric current I c forms variable input voltage by variable resistor Va on input IN1, known through Ohm's law V=I*R, the variable input voltage size that input IN1 is formed is Ic*Ra.It can thus be appreciated that when Ic is for determining electric current, variable input voltage is linear in the value of variable resistor Ra.Linear with the resistance of variable resistor Ra.
In practical application, variable resistor Va can adopt the variable resistor of 100k ohm, and to produce the voltage of 0-10V at variable resistor Va bis-end, this determines electric current must be 100uA, reference voltage end Vref can be utilized in the column to provide 2.5V voltage to determine electric current to produce, but the present invention this is not limited.Refer to the 4th figure, it illustrates the determine current characteristics mould of constant current source 120 respectively under different variable resistor Va resistance and doubts figure,
As shown in Figure 4, the output current of constant current source 120 can remain on about 100uA+/-0.5uA.0-10V voltage is produced, the variable input voltage namely on input IN1 at variable resistor Va bis-end.Then, variable input voltage just forms analog voltage output through exporting slow-action unit 180 on output OUT1, it forms analog voltage and exports Lu Jingyu flow process to, namely in aforementioned paragraphs disclosed adopt analog voltage to input Va time similar, please participating in the 2nd figure and detailed description during about adopting analog voltage to input Va, separately not repeating at this.
In addition, when input IN1 is for open circuit (floating), constant current source 120 can flow to input filter capacitor C2 and filter capacitor C1, and capacitance voltage is improved, the long-pending terminal voltage receiving diode also can improve simultaneously, final to the long-pending breakdown voltage 11V receiving diode.Therefore, this circuit, according to the pulse-width modulation signal of passive (open collector) mode, also can produce pulse-width modulation signal voltage waveform at input, afterwards just with pulse-width modulation signal formal layout.Wherein it should be noted that when input filter capacitor is selected excessive, the time of determining electric current 120 pairs of input filter capacitor C2 chargings can increase, and cause nonideal pulse-width modulation waveform, in practical application, selecting of input filter capacitor C2 can 1000Pf be reference value.
In addition, preferably, multi-dimming input circuit 100 of the present invention except to analog voltage input, pulse-width modulation signal end IN1 be short circuit (short) or pole low-voltage time, then add the function of being cut-off by light further, by this, can realize through the direct switch of brightness adjustment control function, save energy consumption and avoid fluorescent tube that the bright situation of irritating bright back light occurs under low voltage drive.In this implementation column, when the voltage quasi position of this input IN1 is less than fiducial value (such as 0.6V), this light turns off unit 190 just can conducting, is cut-off by feedback circuit 200.
Then, please refer to 5A figure to 5D and scheme, the analog voltage for multi-dimming input circuit of the present invention under different input pattern exports the experimental result picture of relation between various input.Schemed from 5A figure to 5D, it is linear that various different input mode output voltage is input (voltage, resistance, duty).Using this linear anaiog signal as the reference command of light modulation module or drive circuit, the dimming function of multiple input can be realized, in practical application, can be widely used on the light adjusting circuit of light-emittingdiode (light emitting diode, LED).
In sum, the object of its design of the multi-dimming input circuit that the present invention proposes is, polytype input signal is converted to analog voltage to export, using the brightness adjustment control signal as dimming driving circuit on light fixture, and, it is linear and the input voltage, the duty ratio of pulse width modulation signal or the resistance value of variable resistor resistance that are proportional to analog voltage that the analog voltage exported exports palpus.
In sum; embodiment is only preferred optimum implementation of the present invention; unintelligible is limit protection scope of the present invention; the adjustment not exceeding technical solution of the present invention done according to the present invention for the technical work personnel of this area and change, should think and drop in protection scope of the present invention.
Claims (6)
1. a multi-dimming input circuit, in order to produce analog voltage to dimming driving circuit, is characterized in that: described multi-dimming input circuit comprises:
One input, lotus root is connected to an input node;
One output, exports for transmitting described analog voltage;
One constant current source, lotus root is connected to described input node;
One voltage-adjusting unit, lotus root is connected between described input node and an earth terminal, described voltage-adjusting unit comprises a long-pending diode of receiving, when described input inputs described pulse-width modulation signal, described voltage-adjusting unit is used for the voltage max process of described pulse-width modulation signal to the described long-pending breakdown voltage receiving diode;
One filter unit, lotus root is connected between described input node and an earth terminal, and described filter unit comprises a filter resistance and a filter capacitor, and described filter resistance lotus root is connected between described input node and described output slow-action unit; One end of described filter capacitor is electrically connected between described filter resistance and described output slow-action unit, and the other end of described filter unit is electrically connected an earth terminal;
And one exports slow-action unit, lotus root is connected between described filter unit and described output, and described output slow-action unit comprises an operational amplifier; Described operational amplifier forms a voltage with lotus root device;
Wherein, when described input inputs an analog voltage input, described analog voltage exports the voltage quasi position being proportional to the input of described analog voltage; When described input inputs a pulse-width modulation signal, described analog voltage exports the duty ratio being proportional to described pulse-width modulation signal; When between described input and an earth terminal, lotus root connects a variable resistor, described analog voltage exports and is proportional to a described variable-resistance resistance, when between described input and an earth terminal, lotus root connects described variable resistor, described constant current source produces certain electric current, describedly determines electric current by described variable resistor form a variable input voltage on described input.
2. multi-dimming input circuit as claimed in claim 1, it is characterized in that: when described input inputs described pulse-width modulation signal, described filter unit carries out filtering to described pulse-width modulation signal, and produces the described analog voltage output being proportional to the duty ratio of described pulse-width modulation signal.
3. multi-dimming input circuit as claimed in claim 1, it is characterized in that: comprise a current-limiting resistance and an input filter capacitor further, described current-limiting resistance lotus root is connected between described input and described input node; One end of described input filter capacitor is electrically connected between described input and described current-limiting resistance, and the other end of described filter capacitor is electrically connected to an earth terminal.
4. multi-dimming input circuit as claimed in claim 1, is characterized in that: the capacitance of described input filter capacitor is 1000pF.
5. multi-dimming input circuit as claimed in claim 1, is characterized in that: comprise a light further and turn off unit, one end lotus root that described light turns off unit is connected between described filter unit and described output slow-action unit.
6. multi-dimming input circuit as claimed in claim 5, is characterized in that: described light turns off unit other end lotus root and is connected between a feedback circuit and a system voltage end, when the voltage quasi position of described input is less than a fiducial value; Described light turns off unit and is turned off by described feedback circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100103108 | 2011-01-27 | ||
| TW100103108A TWI442822B (en) | 2011-01-27 | 2011-01-27 | Multiple dimming input circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102316632A CN102316632A (en) | 2012-01-11 |
| CN102316632B true CN102316632B (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110134408.4A Active CN102316632B (en) | 2011-01-27 | 2011-05-13 | Multiple light modulation input circuit |
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| CN (1) | CN102316632B (en) |
| TW (1) | TWI442822B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687160A (en) * | 2012-09-25 | 2014-03-26 | 伟训科技股份有限公司 | A universal dimming control device of a LED driver |
| TWI577925B (en) * | 2014-06-27 | 2017-04-11 | 明緯（廣州）電子有限公司 | Dimming circuit and led power supply device having the same |
| CN110225616B (en) * | 2019-06-06 | 2021-10-15 | 成都芯源系统有限公司 | Dimming circuit and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430328A (en) * | 2003-01-23 | 2003-07-16 | 台达电子工业股份有限公司 | Power supply converter having activation overshoot inhibition function |
| CN202276494U (en) * | 2011-05-13 | 2012-06-13 | 明纬(广州)电子有限公司 | Multiple dimming input circuit |
-
2011
- 2011-01-27 TW TW100103108A patent/TWI442822B/en active
- 2011-05-13 CN CN201110134408.4A patent/CN102316632B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430328A (en) * | 2003-01-23 | 2003-07-16 | 台达电子工业股份有限公司 | Power supply converter having activation overshoot inhibition function |
| CN202276494U (en) * | 2011-05-13 | 2012-06-13 | 明纬(广州)电子有限公司 | Multiple dimming input circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201233241A (en) | 2012-08-01 |
| CN102316632A (en) | 2012-01-11 |
| TWI442822B (en) | 2014-06-21 |
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