CN209710366U - Illumination control circuit and lighting system - Google Patents
Illumination control circuit and lighting system Download PDFInfo
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- CN209710366U CN209710366U CN201821737494.1U CN201821737494U CN209710366U CN 209710366 U CN209710366 U CN 209710366U CN 201821737494 U CN201821737494 U CN 201821737494U CN 209710366 U CN209710366 U CN 209710366U
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Abstract
The utility model discloses a kind of illumination control circuit and lighting system, AC power source is rectified to be obtained rectified voltage and powers to LED light, and the LED light is connected to ground by switching tube, and control switch tube current is close to reference current；When reference current is not achieved in switch tube current, reference current is the first electric current, forms the first operation interval；When switch tube current reaches reference current, reference current is the second electric current, forms the second operation interval；First electric current is greater than second electric current.By making input current recessed, the high efficiency of lighting circuit is realized.And this method does not need sampling switch pipe drain voltage, and control is simple, easy to accomplish.
Description
Technical field
The utility model relates to power electronics fields, and in particular to a kind of illumination control circuit and lighting system.
Background technique
The linear LED drive circuit of the prior art, as shown in Figure 1, including rectifier bridge 100, switching tube M01 and for controlling
The control circuit of switching tube.AC-input voltage obtains rectified voltage VREC by rectifier bridge, between rectified voltage VREC and ground
LED light and switching tube M01 are connect, LED light and switching tube M01 series connection, the source electrode of switching tube M01 are connected by current sampling resistor R01
It is connected to and is referenced to ground.Control circuit includes amplifier U01, and amplifier U01 passes through the grid voltage of regulating switch pipe M01, so that Iout*
The average value of R01 is equal to reference voltage VREF, to realize output constant current.
Voltage VIN, LED both end voltage VLED and output current wave are as shown in Fig. 2, voltage VIN is sinusoidal wave shape, in work
In the frequency period, closer to the peak position of voltage VIN waveform, voltage VIN and the pressure difference of LED load both end voltage VLED are got over
Greatly.Power consumption on linear regulation pipe M01 is (VIN-VLED) * Iout, i.e., when voltage VIN ratio LED both end voltage VLED is more greatly,
Power consumption then on linear regulation pipe M01 is bigger, and system effectiveness is lower, and then influences system reliability.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of LED drive circuit for reducing linear regulation pipe power consumption,
To big, the low technical problem of system effectiveness that solves the power consumption on linear regulation pipe of the existing technology.
The technical solution of the utility model is to provide a kind of illumination control method, AC power source is rectified obtain it is whole
Galvanic electricity pressure powers to LED light, and the LED light connects with switching tube, and control switch tube current is close to reference current；When the switch
When the reference current is not achieved in tube current, reference current is the first electric current, forms the first operation interval；When the switching tube electricity
When stream reaches the reference current, reference current is the second electric current, forms the second operation interval；First electric current is greater than described
Second electric current.
As optional, when switch controlled pole tension is greater than first voltage threshold value, characterizes the switch tube current and be not achieved
The reference current；When switch controlled pole tension is less than first voltage threshold value, the characterization switch tube current reaches the base
Quasi- electric current.
As optional, when the difference of the switch tube current and the reference current is greater than first threshold, the switch is characterized
The reference current is not achieved in tube current；When the difference of the switch tube current and the reference current be less than or equal to first threshold,
It characterizes the switch tube current and reaches the reference current.
As optional, in second operation interval, second electric current and switching tube drain voltage change trend are opposite.
As optional, timing is carried out to half of power frequency period, the angle or phase of exchange input are obtained, described second
Operation interval controls the reference current according to the angle or phase.
Another technical solution of the utility model is to provide a kind of illumination control circuit, AC power source is rectified obtain it is whole
Galvanic electricity pressure powers to LED light, and the LED light connects with switching tube, and the illumination control circuit control switch tube current is close to base
Quasi- electric current；When the reference current is not achieved in the switch tube current, the reference current of the illumination control circuit is first
Electric current forms the first operation interval；When the switch tube current reaches the reference current, the base of the illumination control circuit
Quasi- electric current is the second electric current, forms the second operation interval；First electric current is greater than second electric current.
As optional, including the first comparison circuit, first comparison circuit compare switch controlled pole tension and first
Voltage threshold, when the switch controlled pole tension is greater than the first voltage threshold value, the characterization switch tube current is not achieved
The reference current；When the switch controlled pole tension is less than the first voltage threshold value, the characterization switch tube current reaches
To the reference current.
As optional, when the difference of the switch tube current and the reference current is greater than first threshold, the switch is characterized
The reference current is not achieved in tube current；When the difference of the switch tube current and the reference current be less than or equal to first threshold,
It characterizes the switch tube current and reaches the reference current.
It further include current sampling circuit and current control circuit as optional,
The current sampling circuit sampling switch tube current obtains the second voltage of characterization switch tube current, the electric current
Control circuit manages pole tension processed by regulating switch and makes the second voltage close to reference voltage；
Timing is carried out to half power frequency period, obtains the angle or phase of exchange input, in second operation interval,
According to the angle or phase, the reference current is controlled.
The another technical solution of the utility model is to provide a kind of lighting system.
Using the circuit structure of the utility model, compared with prior art, have the advantage that by making input current
It is recessed, realize the high efficiency of lighting circuit.And this method does not need sampling switch pipe drain voltage, and control is simple, is easy real
It is existing.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of prior art LED drive circuit；
Fig. 2 is the working waveform figure of the prior art corresponding with Fig. 1；
Fig. 3 is the lighting system using the utility model illumination control circuit；
Fig. 4 in one embodiment, switch controlled pole tension G, reference current, switchs tube current for the utility model
IM01Waveform diagram；
Fig. 5 is the circuit diagram of one embodiment of the utility model illumination control circuit 300；
Fig. 6 is the circuit diagram of another embodiment of the utility model illumination control circuit 300；
Fig. 7 is the circuit diagram of one embodiment of the utility model current control circuit 310；
Fig. 8 is the utility model switching tube drain voltage DRAIN, reference current, switchs tube current IM01Waveform diagram；
Fig. 9 is the circuit diagram of another embodiment of the utility model illumination control circuit 300；
Figure 10 is the circuit diagram of one embodiment of the utility model voltage sampling circuit 320；
Figure 11 is the circuit diagram of another embodiment of the utility model current control circuit 310；
Figure 12 is the circuit diagram of another embodiment of the utility model current control circuit 310.
Specific embodiment
It is described in detail below in conjunction with preferred embodiment of the attached drawing to the utility model, but the utility model is not merely
It is limited to these embodiments.The utility model covers any substitution made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to make the public have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Concrete details is illustrated, and that this can also be understood completely is practical new for description without these details for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing
It is all made of more simplified form and uses non-accurate ratio, only to facilitate, lucidly aid in illustrating the utility model
The purpose of embodiment.
Please refer to shown in Fig. 3, the utility model provides a kind of illumination control circuit 300, AC power source is rectified obtain it is whole
Galvanic electricity presses VREC to power LED light 200, and the LED light 200 is connected to ground, the illumination control circuit by switching tube M01
300 control switch tube currents are close to reference current；When the reference current is not achieved in the switch tube current, the illumination control
The reference current of circuit processed is the first electric current, forms the first operation interval；When the switch tube current reaches the reference current
When, the reference current of the illumination control circuit is the second electric current, forms the second operation interval；First electric current is greater than described
Second electric current.
It please refers to shown in Fig. 4, for switch controlled pole tension G, reference current and switch tube current IM01Waveform diagram.In
Before the t11 moment, tube current I is switchedM01Reference current is not caught up with, switching tube is in fully on state, and switch controlled is extremely electric
Pressure G is in maximum voltage, is the first operation interval.
With the raising of input voltage, tube current I is switchedM01Reference current, the control electrode electricity of switching tube can not followed
It is pressed near conduction threshold, that is, the t11-t12 moment, is the second operation interval.
Input voltage switchs tube current I toward declineM01Reference current can not be followed again, and switching tube is in fully on shape
State, switch controlled pole tension G are in maximum voltage, come back to the first operation interval, that is, t12-t13 moment.
Reference current waveshape in figure is one of embodiment, and reference current can be arbitrary shape, be not limited to
Waveform in figure.
Whether the utility model can follow reference current by detection switch tube current, and lighting circuit is divided into the first work
Make section and the second operation interval, is respectively the first electric current and the second electricity in the electric current of the first operation interval and the second operation interval
Stream, the first electric current are greater than the second electric current.Namely by making input current recessed, the high efficiency of lighting circuit is realized.And
This method control is simple, easy to accomplish.
It can detecte whether switch tube current can follow reference current there are many mode.It in one embodiment, can be with
Pole tension processed is managed by detection switch to judge.When reference current can be followed by switching tube current, switch controlled is extremely electric
It is pressed in Near Threshold；When reference current cannot be followed by switching tube current, switch controlled pole tension is in maximum value.It please refers to
Shown in Fig. 5, including the first comparison circuit 340, first comparison circuit 340 compare the electricity of switch controlled pole tension G and first
Press threshold value VTH1, when the switch controlled pole tension G be greater than the first voltage threshold value VTH1, characterize the switch tube current
The reference current is not achieved；When the switch controlled pole tension G is less than the first voltage threshold value VTH1, open described in characterization
It closes tube current and reaches the reference current.
It in another embodiment, can be by the size of the difference of detection switch tube current and reference current, to judge out
Close whether tube current can follow reference current.When the difference of switch tube current and reference current is greater than first threshold, characterization switch
Reference current is not achieved in tube current；When the difference of switch tube current and reference current is less than or equal to first threshold, characterization switching tube electricity
Stream reaches reference current.
It please refers to shown in Fig. 6, illumination control circuit includes current control circuit 310, current sampling circuit 330, the first ratio
Compared with circuit 340.Switching tube can be connected to reference to ground, 330 sampling switch pipe of current sampling circuit by current sampling circuit 330
Electric current, obtains the second voltage V2 of characterization switch tube current, and current control circuit 310 receives the output of current sampling circuit 330
Voltage V2, current control circuit 310 manage pole tension G processed by regulating switch and make the second voltage V2 close to reference voltage
VS.Current control circuit 310 exports the difference E1 of second voltage V2 and reference voltage VS, and the first comparison circuit 340 compares E1 and the
One threshold value TH1, current control circuit 310 receive the output voltage V3 of the first comparison circuit, select operation interval according to V3.
It please refers to shown in Fig. 7, is one embodiment of current control circuit 310, reference voltage VS and second voltage V2 are logical
It crosses operational amplifier 313 and carries out operation amplifier, the output of operational amplifier 313 i.e. the output of current control circuit 310, control
The control electrode of switching tube processed.Meanwhile subtraction circuit 319 makes the difference reference voltage VS and second voltage V2, obtains the difference E1 of the two,
Another output as current control circuit.E1 is connected to an input terminal of the first comparison circuit 340 in Fig. 6.
In the second operation interval, reference current can be set and reduce with the increase of drain voltage DRAIN, so that input
Electric current is recessed.It please refers to shown in Fig. 8, for switching tube drain voltage DRAIN, reference current and switch tube current IM01Waveform diagram.
Also reference current can be set to reduce with the increase of switch controlled pole tension G, so that input current is recessed.Reference current
Setting be not limited to above-mentioned several set-up modes, there are various ways.
Timing is carried out to half power frequency period, obtains the angle or phase of exchange input, in the second operation interval, according to
The angle or phase control the reference current.It can store angle or phase and reference voltage in current control circuit 310
Between relationship.For example, the variation tendency of setting reference current and drain voltage DRAIN are on the contrary, then can be in current control electricity
Corresponding relationship in road 310 between stored angles or phase and drain voltage is worked as in the second operation interval according to timing
Perhaps phase according to current angular or phase obtains opposite with the variation tendency of drain voltage DRAIN benchmark electricity to preceding angle
Stream.
It please refers to shown in Fig. 9, drain voltage DRAIN can also be sampled, the change of reference current and drain voltage DRAIN is set
Change trend is opposite.Illumination control circuit 300 includes voltage sampling circuit 320, current sampling circuit 330 and current control circuit 31
The current sampling circuit sampling switch tube current, obtains the second voltage V2 of characterization switch tube current, and voltage sampling circuit is adopted
The drain voltage of sample switching tube, obtains first voltage V1, and current control circuit manages pole tension processed by regulating switch and makes institute
Second voltage is stated close to reference voltage；In second operation interval, current control circuit controls reference voltage and is equal to the first ginseng
Examine voltage VREF1 and the 4th difference in voltage；
When the 4th voltage is equal to the first voltage, in the second operation interval, reference voltage VS is equal to the first ginseng
It examines voltage VREF1 and subtracts first voltage V1, i.e. VS=VREF1-V1.Refering to what is shown in Fig. 10, passing through resistance R321 and resistance R322
Partial pressure samples the drain voltage DRAIN of the switching tube, obtains first voltage V1, by the resistance value for adjusting resistance R321 and R322
To adjust input current waveform.
With reference to shown in Figure 11, the 4th voltage V4 is equal to the product of the first voltage V1 and the first parameter K.Then in the second work
Make section, reference voltage VS=VREF1-K*V1.When the first parameter K is offset voltage or is controlled by offset voltage, then may be used
To realize the constant current of output LED light.Wherein, electric current and reference current operation amplifier are exported, offset voltage is obtained.
When the first operation interval is switched to the second operation interval, since switching tube drain voltage DRAIN is not and Fig. 8
In it is the same, DRAIN voltage is zero, but has certain voltage, and therefore, in reference current switching, reference current has mutation,
Cause input current to have mutation, influences the Electro Magnetic Compatibility of system.Therefore, so, DRAIN voltage when switching is sampled
Holding is maintained voltage V1 ', in the second operation interval,
It please refers to shown in Figure 12, is one embodiment of current control circuit 310.Sampling hold circuit 315 exists according to V3
When first operation interval is switched to the second operation interval, sampling keeps first voltage V1, and be maintained voltage V1 ', passes through
Subtraction circuit 316 obtains first voltage V1 and subtracts to keep voltage V1 ', mlultiplying circuit 311 by the first parameter K multiplied by (V1-V1 '),
Obtain the 4th voltage V4.In the second operation interval, reference voltage VS is equal to VREF1-K* (V-V1 ').
Above-mentioned several method may be implemented in the second operation interval reference current with the increase of drain voltage DRAIN and
Reduce.
The utility model also provides a kind of illumination control method, and the rectified rectified voltage that obtains of AC power source supplies LED light
Electricity, LED light are connected to ground by switching tube, and control switch tube current is close to reference current；When benchmark is not achieved in switch tube current
When electric current, reference current is the first electric current, forms the first operation interval；When switch tube current reaches reference current, benchmark electricity
Stream is the second electric current, forms the second operation interval；First electric current is greater than the second electric current.
As one embodiment, when switch controlled pole tension is greater than first voltage threshold value, characterization switch tube current is not up to
To the reference current；When switch controlled pole tension is less than first voltage threshold value, the characterization switch tube current reaches benchmark
Electric current.
As one embodiment, when switch tube current and reference current difference be greater than first threshold, characterize the switching tube
The reference current is not achieved in electric current；When the difference of the switch tube current and the reference current is less than or equal to first threshold, table
It levies the switch tube current and reaches the reference current.
As one embodiment, in second operation interval, the second electric current and switching tube drain voltage change trend phase
Instead.
As one embodiment, timing is carried out to half of power frequency period, the angle or phase of exchange input is obtained, in institute
The second operation interval is stated, according to the angle or phase, controls the reference current.
As one embodiment, sampling switch tube current obtains the second voltage V2 of characterization switch tube current, described in sampling
The drain voltage of switching tube obtains first voltage V1, manages pole tension processed by regulating switch and makes the second voltage close
Reference voltage；In the second operation interval, controls reference voltage and be equal to the first reference voltage and the 4th difference in voltage；
4th voltage is equal to the first voltage or the 4th voltage is equal to the product of first voltage and the first parameter.
As one embodiment, first parameter is offset voltage, and the second voltage and the second reference voltage carry out
Operation amplifier obtains offset voltage.
The utility model also provides a kind of lighting circuit, including the above illumination control circuit.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (5)
1. a kind of illumination control circuit, the rectified rectified voltage that obtains of AC power source powers to LED light, the LED light and switch
Pipe series connection, it is characterised in that: the illumination control circuit control switch tube current is close to reference current；When the switch tube current
When the reference current is not achieved, the reference current of the illumination control circuit is the first electric current, forms the first operation interval；When
When the switch tube current reaches the reference current, the reference current of the illumination control circuit is the second electric current, forms the
Two operation intervals；First electric current is greater than second electric current.
2. illumination control circuit according to claim 1, it is characterised in that: including the first comparison circuit, first ratio
Compare switch controlled pole tension and first voltage threshold value compared with circuit, when the switch controlled pole tension is greater than first electricity
Threshold value is pressed, the switch tube current is characterized and the reference current is not achieved；When the switch controlled pole tension is less than described the
One voltage threshold characterizes the switch tube current and reaches the reference current.
3. illumination control circuit according to claim 1, it is characterised in that: when the switch tube current and benchmark electricity
The difference of stream is greater than first threshold, characterizes the switch tube current and the reference current is not achieved；When the switch tube current and institute
The difference for stating reference current is less than or equal to first threshold, characterizes the switch tube current and reaches the reference current.
4. illumination control circuit according to claim 1, it is characterised in that: further include current sampling circuit and current control
Circuit,
The current sampling circuit sampling switch tube current obtains the second voltage of characterization switch tube current, the current control
Circuit manages pole tension processed by regulating switch and makes the second voltage close to reference voltage；
Timing is carried out to half power frequency period, obtains the angle or phase of exchange input, in second operation interval, according to
The angle or phase control the reference current.
5. a kind of lighting system, including any one illumination control circuit as described in claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821737494.1U CN209710366U (en) | 2018-10-25 | 2018-10-25 | Illumination control circuit and lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821737494.1U CN209710366U (en) | 2018-10-25 | 2018-10-25 | Illumination control circuit and lighting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209710366U true CN209710366U (en) | 2019-11-29 |
Family
ID=68634807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821737494.1U Active CN209710366U (en) | 2018-10-25 | 2018-10-25 | Illumination control circuit and lighting system |
Country Status (1)
| Country | Link |
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| CN (1) | CN209710366U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109348578A (en) * | 2018-10-25 | 2019-02-15 | 杰华特微电子（杭州）有限公司 | Illumination control method, control circuit and lighting system |
-
2018
- 2018-10-25 CN CN201821737494.1U patent/CN209710366U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109348578A (en) * | 2018-10-25 | 2019-02-15 | 杰华特微电子（杭州）有限公司 | Illumination control method, control circuit and lighting system |
| CN109348578B (en) * | 2018-10-25 | 2024-03-22 | 杰华特微电子股份有限公司 | Lighting control method, control circuit and lighting system |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |