CN202435647U - One-to-ten-volt LED driving light modulation circuit - Google Patents
One-to-ten-volt LED driving light modulation circuit Download PDFInfo
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- CN202435647U CN202435647U CN2011204486928U CN201120448692U CN202435647U CN 202435647 U CN202435647 U CN 202435647U CN 2011204486928 U CN2011204486928 U CN 2011204486928U CN 201120448692 U CN201120448692 U CN 201120448692U CN 202435647 U CN202435647 U CN 202435647U
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Abstract
A one-to-ten-volt LED driving light modulation circuit comprises more than one voltage reference generation unit, more than one voltage reference maintenance unit and a Vref adjusting circuit. The voltage reference generation unit comprises a crystal triode Q1, a voltage reference chip U1, a resistor R3 and a resistor R4 which are all connected in a common manner, and 10.7V voltage is output from the emitter electrode of the crystal triode Q1. The voltage reference maintenance unit comprises a crystal diode D3 and an output node COMP connected to the cathode thereof, wherein constant 10V voltage is output from the node COMP. The Vref adjusting circuit is composed of a plurality of R5s and a passive constant current source and generates reference voltage Vref provided to an operational amplifier A1 to form DIM nodes. Output terminals of all DIMs are connected together and then are connected with the current input terminal of the passive constant current source, and the current outflow terminal of the passive constant current source is connected with the ground. All COMP terminals are connected together, and then a public adjustable constant current source provides voltage reference to a plurality of LED switch power sources.
Description
Technical field
The utility model relates to Switching Power Supply, especially relates to the light adjusting circuit of LED driving power.
Background technology
In the prior art, the design of all using the LED lighting in the household unit has been arranged.
Or at factory floor, the office space is also used the LED illumination and is substituted traditional incandescent lamp, fluorescent lamp, can save electric consumption on lighting greatly like this; Yet thereupon produce a technical problem, when using the LED lamp lighting, its luminosity must be adjustable continuously; And luminous stable, do not glimmer.The Switching Power Supply of constant current output is the desirable driver of driving LED, and through suitable design, its output current ripple is little, and precision is high.Usually, can set the size of output current through setting a reference voltage.The output current of driver is adjustable continuously.This reference voltage can produce with constant-source with adjustable.Certainly this reference voltage is artificial adjustable, in order to adjusting surround brightness, or is transferred to the bright-dark degree that people like.This constant-source with adjustable is referred to as dimmer.
Generally speaking, corresponding LED lamp of dimmer.But some occasion needs the shared dimmer of multi-lamp.This just relates to the problem how a dimmer removes to control many LED lamps, and particularly when some light fixture was done the switch change action, the normal illumination to other light fixtures did not impact, and just should be independently between the light fixture, and is non-interfering.
The 1-10V light modulation is very commonly used in traditional illumination, particularly in American-European market.
But the application of 1-10V light modulation in the LED illumination then is at the early-stage.
Because present relevant criterion all is to formulate to traditional lighting, so the 1-10V light modulation of LED illumination must meet existing standard, like IEC Standard 60929 Annex E.
This is a new demand, does not have this design in the prior art.
The utility model content
A unexistent public adjustable constant-flow source is the technical problem that a plurality of LED Switching Power Supplies provide reference voltage in the prior art in order to solve, and the utility model provides a kind of 1-10 volt LED and drives light adjusting circuit.
When a plurality of LED Switching Power Supplies are concentrated use; For example nearly dozens of LED Switching Power Supply is installed together; Seem not too economical for each LED Switching Power Supply is provided with one group of adjustable constant current output circuit, therefore needing a public adjustable constant-flow source is that a plurality of LED Switching Power Supplies provide reference voltage.
The utility model is realized through adopting following technology:
Manufacture and design a kind of 1-10 volt LED and drive light adjusting circuit, comprising:
More than one reference voltage generating unit comprises a transistor, a voltage reference chip, two resistance, connects by conventional connected mode, at the emitter output 10.7V of transistor voltage;
More than one reference voltage holding unit comprises the output node COMP that a crystal diode and negative pole thereof connect; Said node COMP exports constant 10V voltage;
One Vref adjusts circuit, is made up of many resistance and a passive constant-current source, and the reference voltage Vref of the supply operational amplifier of generation is the DIM node;
The emitter of said transistor connects the crystal diode positive pole;
Each DIM output is linked together, connect the current input terminal of passive constant-current source again, passive constant-current source electric current outflow end ground connection;
Each COMP end links together.
Said transistor is the NPN type.
Said voltage reference chip is TL431.
Said DIM node forms behind the COMP connecting resistance.
The utility model has realized that a public adjustable constant-flow source is the technical problem that a plurality of LED Switching Power Supplies provide reference voltage thus; And need not add to transform for the numerous LED Switching Power Supplies that are installed together, also realized adjusting the brightness that a constant-source with adjustable just can be adjusted the multizone light fixture.
Description of drawings
Fig. 1 is the electric principle schematic that a kind of 1-10 volt of the utility model LED drives single led Switching Power Supply in the light adjusting circuit;
Fig. 2 is that a kind of 1-10 volt of the utility model LED drives the sketch map that the many Switching Power Supplies of light adjusting circuit are connected with constant-source with adjustable.
Embodiment
In order to further specify the utility model, combine a preferred embodiment of the utility model to be elaborated, yet said embodiment is merely the usefulness that furnishes an explanation and explain, can not be used for limiting the scope of patent protection of the utility model at present.
Like Fig. 1, shown in Figure 2, design a kind of 1-10 volt LED and drive light adjusting circuit, said circuit comprises:
More than one reference voltage generating unit comprises transistor Q1, voltage reference chip U1, resistance R 3, resistance R 4, connects by conventional connected mode, at the emitter output 10.7V of transistor Q1 voltage;
More than one reference voltage holding unit comprises the output node COMP that crystal diode D3 and negative pole thereof connect; Said node COMP exports constant 10V voltage;
One Vref adjusts circuit, is made up of many R5 and a passive constant-current source 1, and the reference voltage Vref of the supply operational amplifier A 1 of generation is the DIM node;
It is anodal that the emitter of said transistor Q1 meets crystal diode D3;
Each DIM output is linked together, connect the current input terminal of passive constant-current source 1 again, passive constant-current source 1 electric current outflow end ground connection;
Each COMP end links together.
Said transistor Q1 is the NPN type.
Certainly not limiting must the NPN type, as long as principle is identical, other transistor pages or leaves can be realized
The function of the utility model.
Said voltage reference chip U1 is TL431.
Said DIM node forms behind COMP connecting resistance R5.
The benefit that connects like this is no matter any one Switching Power Supply is turn-offed, and it is its in addition voltage 10V that the COMP end also has other Switching Power Supplies, and diode D3 plays mutual buffer action.
Concrete COMP point voltage numerical value, DIM point voltage numerical value are not given an example at this one by one, and those of ordinary skill can confirm according to specifically being used for, not necessarily must 10V.
Constant-source with adjustable 1 can be used in the prior art ripe circuit, in the utility model, selects the constant-current source of 30ma in execution mode for use, and the maximum current that flows through R5 in each adjustable constant-flow output circuit 2 is 1ma, can connect 30 Switching Power Supplies like this.
In other embodiments, needn't non-ly select the constant-current source of 30ma for use, also not necessarily must connect 30 Switching Power Supplies.
No matter whether certain driving power turn-offs, flow through the setting electric current among its R5 all the time, guarantee the current constant of constant-source with adjustable 1.
Through the adjustable resistance on the passive constant-current source 1 size of its absorbing current is set, this electric current will
R5Produce a pressure drop.By Q1, U1, the constant 10.7V voltage that R3, R4 produce can be known that by Fig. 2 the power supply of each reference voltage circuit 2 disappears along with closing of this Switching Power Supply from the auxiliary output of each Switching Power Supply.
This reference voltage electricity deducts the pressure drop on R5 and the D3; Just can on passive constant-current source 1, obtain pressure drop (10.7-Vr5-Vd3)=10.7-i * R5-0.7=10-10K Ω * i; Vref=[R6/ (R6+R7)] * (10-10K Ω * i) then; Formula is visible thus, through adjusting the size of passive constant-current source 1 absorbing current, just can adjust the size that the Vref value realizes the main circuit output current.
When passive constant-current source 1 a band N platform power supply, and all driving operate as normal, the electric current that flows through dimmer is N * i.And n (0 < n < N) being arranged when the platform driving power is closed, corresponding reference voltage disappears.If common port COMP is not linked together, then, no current flows through R5.Because the absorbing current in adjustable constant-flow source has been set at N * i, so the electric current that flows through R5 in the driving power of operate as normal will increase to (1+n/>N) * i; Vref=[R6/ (R6+R7)] * [10-10K Ω * (1+n/N) * I]; It is thus clear that the driving power of closing is many more, Vref descends big more.Correspondingly, main output current diminishes, and the brightness of LED lamp reduces, and has influenced the normal illumination needs.And receive a time-out when all common ports, and some power-off, its reference voltage will be provided by other power supply reference voltages of normally opening, and the electric current of each control loop that guaranteed to flow through keeps initial value constant, has also just guaranteed the normal illumination needs.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some employing semiconductors as simple deduction or replace, all should be regarded as belonging to the protection range of the utility model.
Claims (4)
1. a 1-10 volt LED drives light adjusting circuit, it is characterized in that said driving light adjusting circuit comprises:
More than one reference voltage generating unit comprises transistor Q1, voltage reference chip U1, resistance R 3, resistance R 4, connects by conventional connected mode, at the emitter output 10.7V of transistor Q1 voltage;
More than one reference voltage holding unit comprises the output node COMP that crystal diode D3 and negative pole thereof connect; Said node COMP exports constant 10V voltage;
One Vref adjusts circuit, is made up of many R5 and a passive constant-current source (1), produces the reference voltage Vref of supplying with operational amplifier A 1, is the DIM node;
It is anodal that the emitter of said transistor Q1 meets crystal diode D3;
Each DIM output is linked together, connect the current input terminal of passive constant-current source (1) again, passive constant-current source (1) electric current outflow end ground connection;
Each COMP end links together.
2. 1-10 volt LED according to claim 1 drives light adjusting circuit, it is characterized in that:
Said transistor Q1 is the NPN type.
3. 1-10 volt LED according to claim 1 drives light adjusting circuit, it is characterized in that:
Said voltage reference chip U1 is TL431.
4. 1-10 volt LED according to claim 1 drives light adjusting circuit, it is characterized in that:
Said DIM node forms behind COMP connecting resistance R5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204486928U CN202435647U (en) | 2011-11-14 | 2011-11-14 | One-to-ten-volt LED driving light modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204486928U CN202435647U (en) | 2011-11-14 | 2011-11-14 | One-to-ten-volt LED driving light modulation circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202435647U true CN202435647U (en) | 2012-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204486928U Expired - Lifetime CN202435647U (en) | 2011-11-14 | 2011-11-14 | One-to-ten-volt LED driving light modulation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752932A (en) * | 2012-07-04 | 2012-10-24 | 林万炯 | LED (light-emitting diode) dimming circuit |
| CN104378888A (en) * | 2014-11-21 | 2015-02-25 | 佛山冠今光电科技有限公司 | Simple silicon-controlled dimming LED driving power supply with high-PFC structure |
-
2011
- 2011-11-14 CN CN2011204486928U patent/CN202435647U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752932A (en) * | 2012-07-04 | 2012-10-24 | 林万炯 | LED (light-emitting diode) dimming circuit |
| CN104378888A (en) * | 2014-11-21 | 2015-02-25 | 佛山冠今光电科技有限公司 | Simple silicon-controlled dimming LED driving power supply with high-PFC structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120912 |
|
| CX01 | Expiry of patent term |