CN207505168U - A kind of LED thyristor regulatings optical circuit - Google Patents
A kind of LED thyristor regulatings optical circuit Download PDFInfo
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- CN207505168U CN207505168U CN201720665293.4U CN201720665293U CN207505168U CN 207505168 U CN207505168 U CN 207505168U CN 201720665293 U CN201720665293 U CN 201720665293U CN 207505168 U CN207505168 U CN 207505168U
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Abstract
The utility model is related to LED electric light source technologies fields, more particularly to a kind of LED thyristor regulatings optical circuit, and it includes controllable silicon dimmer, rectification circuit, LED light group and driving circuit, controllable silicon dimmer is connected by rectification circuit with LED light group, driving circuit one end is connected with LED light group, its other end is connected and is grounded with rectification circuit, and the both ends of rectification circuit are also parallel with a current-limiting circuit.The utility model provides a kind of LED thyristor regulatings optical circuit, a current-limiting circuit is set between the rectification circuit and driving circuit being connect with controllable silicon dimmer, it is played by current-limiting circuit and voltage control is carried out to driving circuit, make it in controllable silicon dimmer corner cut difference, corresponding resistance value is also different, the function of changing the electric current for flowing through LED light group is realized, particularly when light modulator corner cut is smaller, it can play the role of turning off in advance, deepen light modulation depth, improved dimming effect.
Description
Technical field
The utility model is related to LED electric light source technologies field more particularly to a kind of LED thyristor regulatings optical circuits.
Background technology
LED luminous efficiencies are high, power consumption is few, long lifespan, high safety and reliability and are suitable for controlling and dim etc. special
Sign so that LED is applied after 2008 Olympic Games in the growth of blowout.
While LED is widely used, LED drive power is then the guarantee of LED lamp industrialization growth, LED power
Quality directly constrains the reliability of LED lamp product, so the maturation of LED drive power is also quite important.LED component for
The requirement of driving power can be directly connected to the alternating current of 220V, need close to harshness, LED not as common incandescent lamp bulb
Low voltage drive, it is necessary to power converting circuit is carried out, since most of LED type of drive has constant current mode and perseverance currently on the market
Pressure type, both methods have its respective advantage and disadvantage：The electric current of constant current driving output is constant, and uniformity is good, but exports
DC voltage but change in a certain range, and constant pressure driving output electric current change with the increase and decrease of load, uniformly
Property is not high.
As shown in Figure 1, to be common LED multi-stage constant current driving circuit structure figures, wherein VIN is ac input voltage, V+
It is the input voltage after rectified bridge rectification, oscillogram is as shown in Figure 3.LED strings are divided into N sections (N is more than or equal to 1) in Fig. 1,
Every a string of LED numbers are at least one.When V+ voltages increase to certain value, the first start of strings of LED have electric current, and electric current is by perseverance
Flow the limitation of driving circuit；When V+ voltages continue to increase, LED string 2 ~ N strings are lit successively, equally, flow through the electricity of each strings of LED
Stream is controlled by constant-current circuit.Constant-current drive circuit is usually by an amplifier, a power MOS and a resistance group
Into.Wherein, the positive termination reference voltage of amplifier, the source electrode of negative input termination power MOS, output connect the grid of MOS, and resistance connects
Between the source electrode and ground of power MOS, for setting the driving current of constant-flow driver, size of current can be by equation below meter
It calculates：.Under normal conditions, resistance can be outer connecting resistance, to facilitate adjustment output current value.
Above-mentioned this LED multi-stage constant currents driving circuit, although can be realized by changing the corner cut of controllable silicon dimmer
Light modulation to LED strings, still, when the corner cut of controllable silicon dimmer is smaller or larger, light modulation depth is little, so as to cause it
The technical issues of dimming effect is poor.
Utility model content
Based on the above problem, the utility model provides a kind of LED thyristor regulatings optical circuit, of the prior art to solve
The technical issues of light modulation depth of LED thyristor regulating optical circuits is little.
According to above-mentioned purpose, the utility model provides a kind of LED thyristor regulatings optical circuit, including controllable silicon dimmer,
Rectification circuit, LED light group and driving circuit, the controllable silicon dimmer pass through the rectification circuit and the LED light group phase
Even, described driving circuit one end is connected with the LED light group, and the other end is connected and is grounded with the rectification circuit, described whole
The both ends of current circuit are also parallel with a current-limiting circuit.
On the basis of said program preferably, the current-limiting circuit includes bleeder circuit and power tube, and the bleeder circuit is simultaneously
It is associated in the both ends of the rectification circuit, and the bleeder circuit includes two series resistances, the grid of the power tube and two
The public interface of the resistance is connected, and the drain electrode of the power tube is connected with the driving circuit, the source electrode of the power tube
Ground connection.
On the basis of said program preferably, the current-limiting circuit further includes filter capacitor, one end of the filter capacitor with
The public interface of described two series resistances is connected, other end ground connection.
On the basis of said program preferably, the source electrode of the power tube becomes resistance eutral grounding by one.
On the basis of said program preferably, the LED light group includes multiple LED light, and the multiple LED light is serially connected.
On the basis of said program preferably, the driving circuit includes amplifier and power MOS pipe, and the amplifier is just
Reference voltage is accessed in pole, and the cathode of the amplifier is connected with the source electrode of the power MOS pipe, the output terminal of the amplifier and
The grid of the power MOS pipe is connected.
The utility model provides a kind of LED thyristor regulatings optical circuit, the rectification circuit being connect with controllable silicon dimmer with
One current-limiting circuit between driving circuit is set, is played by current-limiting circuit and voltage control is carried out to driving circuit, make it controllable
During silicon light modulator corner cut difference, corresponding resistance value is also different, realizes the function of changing the electric current for flowing through LED light group, is particularly adjusting
It when light device corner cut is smaller, can play the role of turning off in advance, deepen light modulation depth, improved dimming effect.
Description of the drawings
Can be more clearly understood the feature and advantage of the utility model by reference to attached drawing, attached drawing be schematically without
It is interpreted as carrying out any restrictions to the utility model, in the accompanying drawings：
Fig. 1 is the structure chart of the LED drive circuit of the prior art with constant-flow driver；
Fig. 2 is a kind of structure chart of LED thyristor regulatings optical circuit of the utility model
Fig. 3 is the key operation waveforms of circuit shown in Fig. 1；
Fig. 4 is the key operation waveforms figure of circuit shown in Fig. 2.
Specific embodiment
In order to make the purpose of this utility model, technical solution and advantage clearer, clear, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
The embodiment of the utility model is described in detail below in conjunction with attached drawing.
It please refers to shown in Fig. 3, the utility model provides a kind of LED thyristor regulatings optical circuit, including controllable silicon dimmer
100th, rectification circuit 200, LED light group 400 and driving circuit 500.
Wherein, controllable silicon dimmer 100 is connected by rectification circuit 200 with LED light group 400,500 one end of driving circuit with
LED light group 400 is connected, and the other end is connected and is grounded with rectification circuit 200, and the both ends of rectification circuit 200 are also parallel with a limit
Current circuit 300.
In the course of work, DC power supply provides operating voltage for controllable silicon dimmer 100, after rectification circuit 200,
Under the action of current-limiting circuit 300, through overdrive circuit 500 to drive LED light group 400.Changed by controllable silicon dimmer 100
Its corner cut, to reach the voltage for changing driving circuit 500, so as to fulfill the purpose dimmed to LED light group 400.Due to this practicality
The effect of novel current-limiting circuit 300 is, it can be achieved that the voltage adjusting control on driving circuit 500, thus to reach controllable
Silicon light modulator 100 stablize in dimming process the purpose of 400 voltage of LED light group, and in 100 corner cut of controllable silicon dimmer not
Meanwhile the function of the electric current of LED load can be flowed through by change, particularly when light modulator corner cut is smaller, it can play and close in advance
Disconnected effect has deepened light modulation depth, has improved dimming effect.
In order to further illustrate the technical solution of the utility model, please continue to refer to shown in Fig. 3, the current limliting of the utility model
Circuit 300 includes bleeder circuit 301 and power tube M1, wherein, bleeder circuit 301 is connected in parallel on the both ends of rectification circuit 200, and divides
Volt circuit 301 includes two series resistances R1, R2, and the grid of power tube M1 is connected with the public interface of two resistance, power
The drain electrode of pipe M1 is connected with driving circuit 500, the source electrode ground connection of power tube M1.
Further, the current-limiting circuit 300 of the utility model further includes filter capacitor C1, one end of filter capacitor C1 and two
The public interface of a series resistance R1, R2 is connected, other end ground connection.Preferably, the source electrode of power tube M1 passes through a power transformation
Resistance ground connection REXT。
In the course of work, when inputting work wave voltage as shown in Figure 2 in the circuit in the utility model, output is electric
Flow oscillogram as shown in figure 4, wherein, VIN represents the input voltage of AC DC power supplies, V+ represent rectified 200 rectification of circuit it
Input voltage afterwards, and IIN waveforms represent to dim corresponding input current waveform when not adding the utility model current-limiting circuit 300,
IIN ' waveforms dim corresponding input current waveform when representing to add the utility model current-limiting circuit 300.
Shown in Fig. 2 and Fig. 4, by the bleeder circuit 301 that two resistance are formed, after filtered capacitance C1 voltage stabilizings,
A burning voltage proportional to the average voltage of input voltage is obtained, to control the grid of power tube M1.When silicon-controlled
When 100 corner cut of light modulator is smaller, input average voltage is high, and the grid base of a fruit Na of power tube M1 is higher, and power tube M1 is operated in full
And area, show as the source electrode and drain electrode short circuit of power tube M1；And when the corner cut of controllable silicon dimmer 100 is larger, input is average
Voltage is high, and the grid voltage of power tube M1 is relatively low, and power tube M1 is operated in linear zone, shows as a sub- control resistance, and function
The grid voltage of pipe is lower, and resistance is bigger, so as to which output current also can be with reduction, from realizing in controllable silicon dimmer 100
When corner cut is smaller, the effect of switch-off power pipe M1 in advance has deepened light modulation depth, has improved dimming effect.
What deserves to be explained is the LED light group 400 of the utility model includes multiple LED light, multiple LED light are serially connected.Into
One step, the driving circuit 500 of the utility model includes amplifier and power MOS pipe, and the anode of amplifier accesses reference voltage,
The cathode of amplifier is connected with the source electrode of power MOS pipe, and the output terminal of amplifier is connected with the grid of power MOS pipe.
The utility model provides a kind of LED thyristor regulatings optical circuit, in the rectification circuit being connect with controllable silicon dimmer 100
One current-limiting circuit 300 between 200 and driving circuit 500 is set, is played by current-limiting circuit 300 and electricity is carried out to driving circuit 500
Voltage-controlled system makes it in 100 corner cut difference of controllable silicon dimmer, and corresponding resistance value is also different, realizes to change and flows through LED light group 400
Electric current function, particularly when light modulator corner cut is smaller, can play the role of turning off in advance, deepen light modulation depth, changed
It has been apt to dimming effect.
Although being described in conjunction with the accompanying the embodiment of the utility model, those skilled in the art can not depart from
Various modifications and variations are made in the case of the spirit and scope of the utility model, such modifications and variations are each fallen within by appended
Within claim limited range.
Claims (6)
1. a kind of LED thyristor regulatings optical circuit, which is characterized in that including controllable silicon dimmer, rectification circuit, LED light group and drive
Dynamic circuit, the controllable silicon dimmer are connected by the rectification circuit with the LED light group, described driving circuit one end and
The LED light group is connected, and the other end is connected and is grounded with the rectification circuit, and the both ends of the rectification circuit are also parallel with one
Current-limiting circuit.
2. a kind of LED thyristor regulatings optical circuit as described in claim 1, which is characterized in that the current-limiting circuit includes partial pressure
Circuit and power tube, the bleeder circuit is connected in parallel on the both ends of the rectification circuit, and the bleeder circuit includes two series connection
Resistance, the grid of the power tube are connected with the public interface of two resistance, the drain electrode of the power tube and the drive
Dynamic circuit is connected, the source electrode ground connection of the power tube.
3. a kind of LED thyristor regulatings optical circuit as claimed in claim 2, which is characterized in that the current-limiting circuit further includes filter
Wave capacitance, one end of the filter capacitor are connected with the public interface of described two series resistances, other end ground connection.
4. a kind of LED thyristor regulatings optical circuit as claimed in claim 2, which is characterized in that the source electrode of the power tube passes through
One becomes resistance eutral grounding.
5. a kind of LED thyristor regulatings optical circuit as described in claim 1, which is characterized in that the LED light group includes multiple
LED light, the multiple LED light are serially connected.
6. a kind of LED thyristor regulatings optical circuit as described in claim 1, which is characterized in that the driving circuit includes amplification
Device and power MOS pipe, the anode access reference voltage of the amplifier, the cathode of the amplifier and the power MOS pipe
Source electrode is connected, and the output terminal of the amplifier is connected with the grid of the power MOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720665293.4U CN207505168U (en) | 2017-06-09 | 2017-06-09 | A kind of LED thyristor regulatings optical circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720665293.4U CN207505168U (en) | 2017-06-09 | 2017-06-09 | A kind of LED thyristor regulatings optical circuit |
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| CN207505168U true CN207505168U (en) | 2018-06-15 |
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| CN201720665293.4U Active CN207505168U (en) | 2017-06-09 | 2017-06-09 | A kind of LED thyristor regulatings optical circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113163541A (en) * | 2021-02-19 | 2021-07-23 | 生迪智慧科技有限公司 | LED dimming control circuit and LED lamp |
-
2017
- 2017-06-09 CN CN201720665293.4U patent/CN207505168U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113163541A (en) * | 2021-02-19 | 2021-07-23 | 生迪智慧科技有限公司 | LED dimming control circuit and LED lamp |
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