CN105282896B - A kind of LED lamp power control circuit - Google Patents
A kind of LED lamp power control circuit Download PDFInfo
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- CN105282896B CN105282896B CN201410229715.4A CN201410229715A CN105282896B CN 105282896 B CN105282896 B CN 105282896B CN 201410229715 A CN201410229715 A CN 201410229715A CN 105282896 B CN105282896 B CN 105282896B
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- 230000005669 field effect Effects 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 241001465382 Physalis alkekengi Species 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005282 brightening Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
A kind of LED lamp power control circuit includes an AC/DC constant-current supply and a LED lamp load.The LED lamp power control circuit further includes a control module.The control module includes a control signal generating unit, a load feedback unit, a comparing unit and a dividing cell.The control signal generating unit is for providing control signal and providing reference value for the comparing unit.The load feedback unit is used to provide load signal for the comparing unit.The comparing unit load signal and reference value simultaneously export control signal.The dividing cell controls the size of current loaded in the dividing cell according to control signal conduction or shutdown.The LED lamp power control circuit controls the DC current that the dividing cell provides AC/DC constant-current supply and shunts, to achieve the purpose that change electric current of the load in LED lamp load, and then achieve the purpose that the brightness change for changing the LED lamp load.
Description
Technical field
The present invention relates to a kind of lamp power equipment, especially a kind of LED lamp power control circuit.
Background technique
In general daily life, all visible various lighting apparatus everywhere, for example, fluorescent lamp, street lamp, desk lamp, art
Lamp etc..In above-mentioned lighting apparatus, traditionally most of is using osram lamp as illuminating source.In recent years, due to science and technology
Make rapid progress, using light emitting diode (LED) as illuminating source.Notably, in addition to lighting apparatus, for general traffic number
Will, billboard, car light etc. are also changed to use light emitting diode as illuminating source.Use light emitting diode as luminous light
Source is advantageous in that power saving, and brightness is bigger, therefore in the upper gradually generalization of use.
With popularizing for LED lamp, more and more occasions begin to use LED lamp.And LED bar graph lamp is used some
The occasion of tool, brightness change when LED light switchs the on or off of the frequency, brightness change, particularly LED light are needed according to user's
Demand carries out regular variation.For example, user is often not intended to lamps and lanterns just to brighten quickly when using lamps and lanterns at night, and
It is desirable to lamps and lanterns brightening slowly, because quickly bright will cause the inadaptable of human eye.Similarly, user is also not intended to lamp at night
Tool is turned off quickly, causes the discomfort of human eye.
Summary of the invention
In view of this, it is necessary to provide a kind of LED lamp power supplys of the brightness change of LED light that can control LED lamp
Control circuit, to meet the demand.
A kind of LED lamp power control circuit is permanent by the AC/DC including an AC/DC constant-current supply and one
Galvanic electricity source obtains the LED lamp load of the energy.The LED lamp power control circuit further include one be electrically connected at it is described
Control in circuit between AC/DC constant-current supply and LED lamp load and for controlling the LED lamp load brightness change
Module.The control module include a control signal generating unit, a load feedback unit, a comparing unit, and
One dividing cell.The control signal generating unit is for providing control signal and providing reference value for the comparing unit.
The load feedback unit loads for detecting the LED lamp and provides load signal for the comparing unit.The comparison
The unit load signal and reference value simultaneously export control signal.The dividing cell is exported according to the comparing unit
It is big with electric current of the output control signal control load according to comparing unit in the dividing cell to control signal conduction or shutdown
Small, comparing unit includes an operational amplifier, the reverse input end and control signal generating unit electricity of the operational amplifier
Property connection, the positive input of the operational amplifier and load feedback unit be electrically connected, the output of the operational amplifier
End is electrically connected with the dividing cell；The dividing cell includes a shunt resistance R20 and one and shunt resistance R20
Concatenated field-effect tube or triode, when the load signal is less than reference value, the field-effect tube or triode are in and close
Closed state；The dividing cell includes a shunt resistance and one and the concatenated field-effect tube of the shunt resistance or triode,
When the load signal is greater than the reference value, the field-effect tube is in the open state.
Compared with prior art, it is provided with control module in the circuit of the LED lamp power control circuit, the control mould
There is the control signal generating unit, which is provided with the LED for controlling the LED lamp load in block
The signal of lamp brightness change, the signal by the comparing unit compared with load signal, to control the dividing cell pair
The DC current that AC/DC constant-current supply provides is shunted, to reach the electric current for changing load in LED lamp load
Purpose, and then achieve the purpose that the brightness change for changing LED lamp load.When the control signal generating unit provides
The LED light of one control signal become larger at any time, the LED lamp load will gradually be brightened by secretly, reach basis
The demand of user carries out the requirement of regular variation, such as above-mentioned brightening slowly, will not the bright human eye that will cause quickly
It is inadaptable.
Detailed description of the invention
The embodiment of the present invention is described below in conjunction with attached drawing, wherein.
Fig. 1 is a kind of circuit diagram of LED lamp power control circuit provided by the invention.
Fig. 2 is the circuit diagram of the LED lamp power control circuit of Fig. 1.
Fig. 3 has AC/DC constant-current supply, dividing cell and control signal by the LED lamp power control circuit of Fig. 1
The comparative diagram of the signal curve of generating unit output.
Specific embodiment
Specific embodiments of the present invention are further elaborated below based on attached drawing.It should be appreciated that this place is retouched
The specific embodiment stated only is used as embodiment, is not intended to limit the scope of protection of the present invention.
Fig. 1 and Fig. 2 is please referred to, is a kind of circuit theory of LED lamp power control circuit 100 provided by the present invention
Figure.The LED lamp power control circuit 100 includes an AC/DC constant-current supply 10, and one passes through the AC/DC Constant Electric Current
Source 10 obtains the LED lamp load 11 of the energy and one is electrically connected at the AC/DC constant-current supply 10 and bears with LED lamp
Carry the control module 12 in the circuit between 11.The control module 12 loads 11 brightness changes for controlling the LED lamp.
It is envisioned that the LED lamp power control circuit 100 can also include other function module, such as filter circuit.
The AC/DC constant-current supply 10 is used to provide DC power supply according to the power reguirements of LED lamp load 11.The AC/
One end of DC constant-current supply 10 connects alternating current, and the other end exports the DC current for being suitble to LED light to use.As shown in Fig. 2, its for institute
State the circuit diagram of AC/DC constant-current supply 10 comprising have transformer circuit, the various functional units such as filter circuit, are ability
Technology known by field technique personnel, details are not described herein.As shown in figure 3, curve A is defeated for the AC/DC constant-current supply 10
The curve that electric current out changes over time.It can be seen that the electric current that the AC/DC constant-current supply 10 is exported from the curve A of Fig. 3
Value is the steady state value not changed over time.
The LED lamp load 11 includes at least one LED light.The LED light be those skilled in the art known by, can
Think one, can also be in series or in parallel with multiple.
The control module 12 includes a control signal generating unit 121, a load feedback unit 122, a ratio
Compared with unit 123 and a dividing cell 124.
The control signal generating unit 121 includes an analog circuit or single-chip microcontroller.In the present embodiment, the control
Signal generating unit 121 includes a single-chip microcontroller N1, controls signal required for generating according to the demand of user.Control letter
It number can be a fixed value, be also possible to the curve changed over time.In the present embodiment, as shown in figure 3, the control is believed
The signal that number generating unit 121 provides is a curve changed over time.Current curve C as shown in Figure 3 is to require to apply
The current curve being added in the LED lamp load 11.As can be seen that electric current is very when time t is 0 to 6 from curve B
It is small, and slowly increase, so that the LED light of LED lamp load 11 slowly brightens, and in time t after 6,
Current value is increasingly becoming rated current required for LED lamp load 11, i.e., the LED light of the described LED lamp load 11 into
Enter normal light application time.It is understood, however, that slowly the raised time can be 6 seconds to the electric current, but its
His numerical value, can become, according to the demand of user here, an only embodiment.The meaning of curve B is, when in night,
User opens the LED light of the LED lamp load 11, will not just become very bright quickly, keeps human eye inadaptable, uncomfortable, and
It is process that is gradually light, being adapted to human eye one.The control signal generating unit 121 will be defeated in some specific time
The control signal of a special value out, i.e., in a certain specific time, the numerical value of the control signal is fixed and invariable, only with
The variation of time, the value of the control signal are variations.Figure it is seen that the control signal generating unit 121 further includes it
His some functional circuits, such as filter circuit, overvoltage crowbar, and the bleeder circuit of suitable voltage is provided for the single-chip microcontroller
Deng.
The load feedback unit 122 is electrically connected in the circuit of LED lamp load 11, and including at least one electricity
Resistance.In the present embodiment, the load feedback unit 122 includes three resistance R15, R16, R17 in parallel.By described in detection
The voltage at three both ends parallel resistance R15, R16, R17, it can detect the load signal of the LED lamp load 11.Root
The brightness for the LED light that 11 can be loaded to the LED lamp according to the load signal detected is targetedly adjusted, and is made
The brightness of LED light changes acording to the requirement of user.
The comparing unit 123 includes an operational amplifier N2B, a loop compensation circuit and other components.
The operational amplifier N2B be mainly used for control signal to input from the control signal generating unit 121 with it is described
The load signal of load feedback unit 122 is compared processing and exports control signal.Therefore operational amplifier N2B's is reversed
The output end of input terminal and the control signal generating unit 121 is electrically connected to receive its output signal.And its forward direction input
End is electrically connected with 122 output end of load feedback unit to receive its output signal.The output end of operational amplifier N2B
It is electrically connected with the input terminal of the dividing cell 124 to control the dividing cell 124 and work.The loop compensation circuit electricity
Property be connected between the output end and positive input of the operational amplifier N2B, and including a resistance R9 and one with should
The concatenated capacitor C4 of resistance R9.The loop compensation circuit is for making described operational amplifier N2B the operation is stable, working principle
Voltage instability exactly using the in due course electric discharge of the capacitor C4 come compensated operational amplifier N2B at work.
The dividing cell 124 is opened or closed according to the output signal of the comparing unit 123, therefore, the shunting list
Member 124 is electrically connected between the comparing unit 123 and LED lamp load 11.The dividing cell 124 includes a shunting
Resistance R20 and one and the concatenated field-effect tube of shunt resistance R20 or triode.It is well known that field-effect tube or three
Pole pipe be it is a kind of using control input circuit field effect come a kind of semiconductor devices of output control loop electric current, that is, should
The characteristic of semiconductor devices is the curve changed according to field effect.In the present embodiment, the shunt resistance 124 includes one
Field-effect tube Q2.Referring to Fig. 3, the curve C of the Fig. 3 is the characteristic curve of the field-effect tube Q2.Pass through the AC/DC constant current
The curve A of the output electric current of power supply 10 compared with the curve C of the field-effect tube with subtract difference, so that it may obtain load described
Load curve in LED lamp load 11, i.e. curve B.
At work, by under the control of the operational amplifier N2B, when the load letter from LED lamp load 11
Number it is less than the control signal generating unit 121 when being provided as the control signal of reference value, the field-effect tube or three poles
Pipe will be in close state.And when the load signal is greater than the reference value, the field-effect tube or triode will be in
Open state.Therefore, in the preceding 6 second time that LED lamp load 11 is opened, load signal is that AC/DC constant-current supply 10 provides
Current signal, as can be seen from the figure the load signal will be greater than control signal generating unit 121 provide reference value, this
When, the field-effect tube of the dividing cell 124 will open, so that the electric current provided AC/DC constant-current supply 10 shunts, have
The size that body shunts is subtracted for the current value that at a time AC/DC constant-current supply 10 provides and is loaded in the dividing cell 124
Current value size.And the size of the current value loaded in dividing cell 124 by field-effect tube or triode at the moment
Resistance value determines.When operation a period of time, due to the effect of dividing cell 124, so that the ginseng that control signal generating unit 121 provides
It examines value to be gradually increased, finally greater than the load signal from LED lamp load 11.At this point, the field-effect of the dividing cell 124
Pipe or triode will be in close state, so that LED lamp load 11 enters normal rating Brightness Duty state, while institute
State the control that control module 12 also completes the brightness change of a LED light.
It is understood that the brightness of the LED lamp load 11 can also show more different brightness changes,
Version controls the curve of signal provided by the control signal generating unit 121 to determine, if the curve is wave
Shape, then the LED lamp load 11 then shows light and shade interval variation.
Compared with prior art, it is provided with control module 12 in the circuit of the LED lamp power control circuit 100, it should
There is the control signal generating unit 121, which is provided with described in control in control module 12
LED lamp load 11 LED light brightness change signal, the signal by the comparing unit 122 compared with load signal, from
And control the DC current that the dividing cell 124 provides AC/DC constant-current supply and shunt, exist to reach change load
The purpose of electric current in the LED lamp load 11, and then reach the mesh for changing the brightness change of the LED lamp load 11
's.When the control signal generating unit 121 provides a control signal become larger at any time, the LED lamp load
11 LED light will gradually be brightened by secretly, reach the requirement for carrying out regular variation according to the demand of user, and such as above-mentioned is slow
Slow brightens, and quickly bright will not will cause the inadaptable of human eye.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Mind and the interior made any modifications, equivalent replacements, and improvements of principle etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of LED lamp power control circuit comprising an AC/DC constant-current supply and one are permanent by the AC/DC
Galvanic electricity source obtains the LED lamp load of the energy, it is characterised in that: the LED lamp power control circuit further includes an electrical property
It is connected in the circuit between the AC/DC constant-current supply and LED lamp load and for controlling the LED lamp load brightness
The control module of variation, the control module include a control signal generating unit, a load feedback unit, a comparison
Unit and a dividing cell, the control signal generating unit is for providing control signal and mentioning for the comparing unit
It is worth for reference, the load feedback unit loads for detecting the LED lamp and provides load signal for the comparing unit,
The comparing unit load signal and reference value simultaneously export control signal, and the dividing cell is according to described relatively more single
The control signal conduction of member output or shutdown are to control signal control load in the dividing cell according to the output of comparing unit
Size of current, comparing unit includes an operational amplifier, the reverse input end of the operational amplifier and control signal hair
Raw unit is electrically connected, and the positive input and load feedback unit of the operational amplifier are electrically connected, the operation amplifier
The output end of device and the dividing cell are electrically connected；The dividing cell includes a shunt resistance R20 and one and this point
The concatenated field-effect tube of leakage resistance R20 or triode, when the load signal is less than reference value, the field-effect tube or three poles
Pipe is in close state；The dividing cell include a shunt resistance and one with the concatenated field-effect tube of the shunt resistance or
Triode, when the load signal is greater than the reference value, the field-effect tube is in the open state.
2. LED lamp power control circuit as described in claim 1, it is characterised in that: the control signal generating unit is
Analog circuit or single-chip microcontroller.
3. LED lamp power control circuit as described in claim 1, it is characterised in that: the load feedback unit includes extremely
Few resistance, the voltage value by detecting the resistance both ends can be detected the load signal of the LED lamp load.
4. LED lamp power control circuit as claimed in claim 3, it is characterised in that: the comparing unit further includes one
The loop compensation circuit being connected between the reverse input end and output end, the loop compensation circuit is for putting the operation
Big device the operation is stable.
5. LED lamp power control circuit as claimed in claim 4, it is characterised in that: the loop compensation circuit includes one
A resistance R9 and one and the concatenated capacitor C4 of resistance R9.
6. LED lamp power control circuit as described in claim 1, it is characterised in that: the control signal generating unit mentions
The signal of confession is a fixed value or a curve changed over time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410229715.4A CN105282896B (en) | 2014-05-27 | 2014-05-27 | A kind of LED lamp power control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410229715.4A CN105282896B (en) | 2014-05-27 | 2014-05-27 | A kind of LED lamp power control circuit |
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| CN105282896A CN105282896A (en) | 2016-01-27 |
| CN105282896B true CN105282896B (en) | 2019-08-02 |
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| CN201410229715.4A Active CN105282896B (en) | 2014-05-27 | 2014-05-27 | A kind of LED lamp power control circuit |
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| CN105282896A (en) | 2016-01-27 |
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Address after: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Ningbo Purcell Electronics Ltd. Applicant after: SELF ELECTRONICS CO., LTD. Address before: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Ningbo Purcell Electronics Ltd. Applicant before: SELF ELECTRONICS CO.,LTD. |
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