CN103957622B - Adapt to LED light-dimming methods, circuit and the electric power system of NEMA curves - Google Patents
Adapt to LED light-dimming methods, circuit and the electric power system of NEMA curves Download PDFInfo
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- CN103957622B CN103957622B CN201410014105.2A CN201410014105A CN103957622B CN 103957622 B CN103957622 B CN 103957622B CN 201410014105 A CN201410014105 A CN 201410014105A CN 103957622 B CN103957622 B CN 103957622B
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Abstract
The invention provides a kind of LED light-dimming methods of adaptation NEMA curves, it is applied in the LED electric power systems with light modulator, and the LED electric power systems control power switch to be powered for LED by controller, by the instantaneous value and peak value that obtain first voltage.And using the peak value of the instantaneous value of the first voltage and the first voltage as the input of the controller, the first output current of the LED electric power systems output is adapted to NEMA curves.Wherein, first voltage be flow through light modulator and rectifier bridge by tangent DC voltage, it can be seen that, using this method, the size of output current can be regulated and controled according to the peak value of first voltage and instantaneous value, and then causing that LED matches with existing controllable silicon dimmer, i.e. the light modulation of LED matches with the incandescent lamp curve of NEMA.
Description
Technical field
It is to be related to a kind of LED of adaptation NEMA curves to dim in particular the present invention relates to switch power technology field
Method, circuit and electric power system.
Background technology
The advantages of LED is by its powerful luminous efficiency and working life more long, just progressively replaces incandescent lamp.In order to
The use demand of user is better met, it is necessary to carry out light modulation treatment to intensity of illumination under certain situation.
At present, it is because controllable silicon dimmer has a wide range of applications in the illuminators such as incandescent lamp, halogen therefore controllable
Silicon light modulator occupies larger light modulation market.Except this, American Electronic AEM (NEMA) has also promulgated light modulation standard
SSL6, wherein depicting the dimming curve of incandescent lamp.It can be seen that, LED wants replacement incandescent lamp and is accomplished by and controllable silicon dimmer phase
Mutually compatible matching.
Therefore, LED how is made to match with existing controllable silicon dimmer, so that the light modulation of LED and the incandescent lamp of NEMA
Curve matches, and is a current problem urgently to be resolved hurrily.
The content of the invention
In view of this, the invention provides a kind of LED light-dimming methods of adaptation NEMA curves, circuit and electric power system,
So that LED matches with existing controllable silicon dimmer, and then the light modulation of LED is set to be matched with the incandescent lamp curve of NEMA.
To achieve the above object, the present invention provides following technical scheme：
A kind of LED light-dimming methods of adaptation NEMA curves, are applied in the LED electric power systems with light modulator, the LED
Electric power system controls power switch to be powered for LED by controller, including：
Obtain the instantaneous value and peak value of first voltage, the first voltage be flow through light modulator and rectifier bridge by phase
The DC voltage cut；
Using the peak value of the instantaneous value of the first voltage and the first voltage as the input of the controller, make institute
The first output current for stating the output of LED electric power systems adapts to NEMA curves.
Preferably, the controller makes first constant output current by preset algorithm.
Preferably, the preset algorithm is：
Wherein, I0_meanIt is first output current, VPD
(α, θ) is the instantaneous value of the first voltage, VDIM(α, θ) is the peak value of the first voltage.
Preferably, also include：
The angle of flow according to the light modulator is compensated to the peak value of the first voltage, makes the peak of the first voltage
Value increases with the reduction of the angle of flow of the light modulator.
A kind of LED light adjusting circuits of adaptation NEMA curves, are applied to control power switch for LED powers by controller
LED electric power systems, including：First detection circuit, the second detection circuit, controller and light modulator；
The first detection circuit is connected with the output end of the light modulator, for obtaining that the light modulator exports by phase
The instantaneous value of the DC voltage cut；
The second detection circuit is connected with the described first detection circuit, described by tangent DC voltage for obtaining
Peak value；
The controller receives the instantaneous value and peak value of the DC voltage, and for regulating and controlling the LED electric power systems
First output current so that first output current is controlled to adapt to NEMA curves by the light modulator.
Preferably, also including being connected with the described first detection circuit and the second detection circuit, according to described by phase
The instantaneous value of the DC voltage cut and the peak value by tangent DC voltage, according to preset formula, are calculated first
The processor of output current.
Preferably, the preset formula is：
Wherein, I0_meanIt is first output current, VPD
(α, θ) is the instantaneous value by tangent DC voltage, VDIM(α, θ) is the peak value by tangent DC voltage, and k is
Setting value.
Preferably, also include：
It is connected with the described second detection circuit, the angle of flow according to the light modulator is to described by tangent DC voltage
Peak value is compensated, the benefit increased the reduction for making the angle of flow of the peak value by tangent DC voltage with the light modulator
Repay circuit.
Preferably, the first detection circuit includes first resistor, second resistance, 3rd resistor and the first electric capacity；Institute
Stating the second detection circuit includes the first diode, the 4th resistance, the second electric capacity, the first voltage-stabiliser tube and the 5th resistance；
The output end of the first termination rectifier bridge of the first resistor；Second end of the first resistor is respectively with described
The first end of the first end of one electric capacity and the second resistance is connected, and defeated as the first signal of the described first detection circuit
Go out end；Second end of the second resistance respectively with the first end and the anode phase of first diode of the 3rd resistor
Even；The negative electrode of first diode first end, the first end of second electric capacity, described respectively with the 4th resistance
The first end of the negative electrode of one voltage-stabiliser tube and the 5th resistance is connected, and defeated as the secondary signal of the described second detection circuit
Go out end；Second end of first electric capacity, the second end of the 3rd resistor, the second end, described second of the 4th resistance
The anode of the second end of electric capacity and first voltage-stabiliser tube is grounded.
Preferably, the compensation circuit includes：6th resistance, switching tube, the second diode, the 7th resistance, the 8th resistance
And the 3rd electric capacity；
The first end of the 6th resistance is connected with the negative electrode of second diode, and connects power Vcc；6th electricity
Second end of resistance is connected with the input of the switching tube；The output end of the switching tube is connected with the described second detection circuit；
The control end of switching tube anode, the first end of the 7th resistance, the 8th electricity respectively with second diode
The first end of the first end of resistance and the 3rd electric capacity is connected, and the of the second end of the 8th resistance and the 3rd electric capacity
Two ends are connected, and ground connection；Second end of the 7th resistance is connected with the output end of the rectifier bridge.
Preferably, including：Light adjusting circuit described in light modulator, rectifier bridge and any one.
Understood via above-mentioned technical scheme, compared with prior art, the invention provides a kind of adaptation NEMA curves
LED light-dimming methods, it is applied in the LED electric power systems with light modulator, and the LED electric power systems control work(by controller
Rate switch is powered for LED, by the instantaneous value and peak value that obtain first voltage.And by the instantaneous value of the first voltage and
The peak value of the first voltage fits the first output current of the LED electric power systems output as the input of the controller
Answer NEMA curves.Wherein, first voltage be flow through light modulator and rectifier bridge by tangent DC voltage, it is seen then that using this
Method, the size of output current can be regulated and controled according to the peak value of first voltage and instantaneous value, and then cause that LED is controllable with existing
Silicon light modulator matches, i.e. the light modulation of LED matches with the incandescent lamp curve of NEMA.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of flow chart of the LED light-dimming methods of adaptation NEMA curves provided in an embodiment of the present invention；
Fig. 2 is the output voltage waveforms and the waveform diagram by tangent DC voltage of external ac power source；
Fig. 3 is the oscillogram formed by the instantaneous value of tangent DC voltage；
Fig. 4 is the oscillogram formed by the peak value of tangent DC voltage；
Fig. 5 is the curve map of the output current of LED light adjusting circuits provided using the present embodiment；
A kind of theory diagram of LED light adjusting circuits that Fig. 6 is provided for the present invention；
A kind of physical circuit pie graph of LED light adjusting circuits that Fig. 7 is provided for the present invention；
Fig. 8 is using the output current after a kind of LED light adjusting circuits with compensation circuit provided in an embodiment of the present invention
Curve map.
Specific embodiment
For the sake of quoting and understanding, the explanation of the technical term for hereinafter using, write a Chinese character in simplified form or abridge and be summarized as follows：
NEMA：National Electrical Manufactures Association, national electrical manufacturers association.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment one
Accompanying drawing 1 is referred to, is a kind of flow chart of the LED light-dimming methods of the adaptation NEMA curves for providing of the invention, the party
Method is applied in the LED electric power systems with light modulator, and it is LED that the LED electric power systems control power switch by controller
Power supply, its method includes step：
S101：Obtain the instantaneous value and peak value of first voltage.
It should be noted that the first voltage be flow through light modulator and rectifier bridge by tangent DC voltage.Please join
See Fig. 2, be the output voltage curve and the curve synoptic diagram by tangent DC voltage of external ac power source.Wherein, curve
101 is the output voltage curve of external ac power source, in dimmer application, after curve 101 is accessed into light modulator, produces one by phase
The alternating voltage cut,, by tangent alternating voltage again by after rectifier bridge treatment, output one is by tangent DC voltage (i.e. for this
One voltage), forming curves 102.With reference to Fig. 2, α be light modulator in light modulation it is corresponding sometime by tangent angle, i.e.,
102 curve reclaimed waters square angle upwards corresponding to straight line in Fig. 2.Accordingly, π-α are the angle of flow of now light modulator, and θ is tune
The input voltage of light device phase angle at a time.
Specifically, with reference to Fig. 2, it is known that, the instantaneous value of first voltage is certain value on curve 102 when at a time,
It also will be understood that into being the corresponding value of curve 102 in out of phase angle θ.And the peak value of first voltage, i.e., by tangent direct current
Maximum in the peak value homologous thread 102 of voltage.
S102：Using the peak value of the instantaneous value of the first voltage and the first voltage as the defeated of the controller
Enter, the first output current of the LED electric power systems output is adapted to NEMA curves.
Preset formula in above-mentioned steps can be set according to actual regulatory demand, the curve according to incandescent lamp,
It makes first constant output current by the controller using preset algorithm, in the present embodiment, preferential from as follows
Formula：
Formula 1
Wherein, Rcs is the value of controller CS ends resistance.α is light modulator corresponding sometime tangent in light modulation
Angle, accordingly, π-α are the angle of flow of now light modulator, and θ is the input voltage phase angle at a time of light modulator.k
For according to output voltage and the big value for setting of bearing power, I0_mean is first output current, VPD(α,θ)
It is the instantaneous value of the first voltage, contains by the information of phase corner cut, its waveform is as shown in Figure 3.Assuming that AC-input voltage
It is vin*sin (θ) that kPD is partial pressure coefficient, then VPD(α, θ) expression formula is：
Formula 2
Wherein, vin refers to input AC voltage peaks, and VDIM(α, θ) is the peak value of the first voltage, and as phase corner cut is α
When the peak value by cut DC voltage.Now, set when KDIM is partial pressure coefficient, then VDIM(α, θ) expression formula is：
Formula 3
It should be noted that VDIMThe voltage change trend of (α, θ) is as shown in Figure 4.And by above-mentioned formula 1, formula 2 and
Formula 3, the dimming curve for drawing is as shown in Figure 5.Curve 301 and curve 304 are respectively incandescent lamp curve in NEMA curves in figure
Upper and lower bound, curve 303 be incandescent lamp curve, curve 302 is using the curve after this light-dimming method.As can be seen that this
Dimming curve 302 disclosure satisfy that requirement of the NEMA curves to dimming.
On the basis of the embodiment that the invention described above is provided, in order to be able to meet depth light modulation, that is, need to make the tune in Fig. 5
Closer to the curve 303 of incandescent lamp, the present embodiment also includes light curve 302：
Step S103：The angle of flow according to the light modulator is compensated to the peak value of the first voltage, makes described
The peak value of one voltage increases with the reduction of the angle of flow of the light modulator.
Specifically, with reference to Fig. 5, curve 302 is compared with curve 303, it is known that, in order to meet depth light modulation, it is necessary to
After making to be reached to a certain degree by phase corner cut, VDIM(α, θ) signal becomes big with becoming big by phase corner cut, i.e., in light modulation, with leading
The change output current Io of current flow angle adapts to the requirement of NEMA dimming curves, while when the angle of flow is smaller, output current can
Also should be in less level.
To sum up, the light-dimming method for being provided using the present embodiment, in light modulation, VPD(α, θ) characterizes input voltage through toning
By tangent information, V after light deviceDIM(α, θ) is characterized by the peak information of tangent DC voltage, and relatively good in order to obtain
Dimming effect, after being reached to a certain degree by phase corner cut α, compensation circuit is to VDIM(α, θ) provides compensation, hereafter VDIM(α, θ) is
Voltage signal after compensation, then, controller passes throughTo determine the size of output current, and by preset algorithm
(can be formula 1) can just make output current can adapt to the requirement of light regulation of NEMA curves, and can reach preferably light modulation effect
Really.
Method is described in detail in the embodiment that the invention described above is provided, can be taken various forms for the method for the present invention
Circuit realiration, therefore present invention also offers a kind of light adjusting circuit, specific embodiment is given below and is described in detail.
Embodiment two
Fig. 6 is referred to, a kind of theory diagram of the LED light adjusting circuits of the adaptation NEMA curves provided for the present embodiment, bag
Include：First detection circuit 221, second detection circuit 222, controller and light modulator.
Wherein, first detection circuit be connected with the output end of light modulator 223, for obtain light modulator export by tangent
The instantaneous value of DC voltage.Second detection circuit is connected with the first detection circuit, for obtaining by the peak of tangent DC voltage
Value.
Preferably, also including compensation circuit, the compensation circuit is connected with the second detection circuit, according to the angle of flow of light modulator
To being compensated by the peak value of tangent DC voltage, make the subtracting with the angle of flow of light modulator by the peak value of tangent DC voltage
It is small and increase.
It is a kind of particular circuit configurations figure of light adjusting circuit that the present embodiment is provided specifically, referring to Fig. 7, wherein, the
One detection circuit includes first resistor 201, second resistance 203, the electric capacity 202 of 3rd resistor 204 and first.Second detection circuit
Including the first diode 205, the 4th resistance 206, the second electric capacity 207, the first voltage-stabiliser tube 208 and the 5th resistance 209.
Its annexation is：
The output end of the first termination rectifier bridge of first resistor.Second end of first resistor is respectively with the first of the first electric capacity
The first end of end and second resistance is connected, and as the first signal output part of the first detection circuit.The second of second resistance
End is connected with the first end of 3rd resistor and the anode of the first diode respectively.The negative electrode of the first diode is electric with the 4th respectively
The first end of the first end of resistance, the first end of the second electric capacity, the negative electrode of the first voltage-stabiliser tube and the 5th resistance is connected, and as the
The secondary signal output end of two detection circuits.Second end of the first electric capacity, the second end of 3rd resistor, the second of the 4th resistance
The anode of end, the second end of the second electric capacity and the first voltage-stabiliser tube is grounded.
Compensation circuit 220 includes：6th resistance 211, switching tube 210, the second diode 212, the 7th resistance the 213, the 8th
The electric capacity 215 of resistance 214 and the 3rd.
Its annexation is：The first end of the 6th resistance is connected with the negative electrode of the second diode, and connects power Vcc.6th
Second end of resistance is connected with the input of switching tube.The output end of switching tube is connected with the second detection circuit.The control of switching tube
The of end processed anode respectively with the second diode, the first end of the 7th resistance, the first end of the 8th resistance and the 3rd electric capacity
One end is connected, and the second end of the 8th resistance is connected with the second end of the 3rd electric capacity, and ground connection.Second end of the 7th resistance and rectification
The output end of bridge is connected.
Foregoing circuit is used to sample by the peak value and instantaneous value of tangent DC voltage, and the present embodiment also adopts foregoing circuit
The peak value and instantaneous value of collection are sent to controller, and the processor is according to described by the instantaneous value of tangent DC voltage and described
By the peak value of tangent DC voltage, according to preset formula, the first output current is calculated.Explanation is needed exist for, should
Controller can be the controller of the model AP1690 of BCD companies, it is of course also possible to be other controllers, not office herein
It is limited to this.
Preferably, above-mentioned preset formula is：
Wherein, I0_meanIt is first output current, VPD
(α, θ) is the instantaneous value by tangent DC voltage, VDIM(α, θ) is the peak value by tangent DC voltage.
With reference to the specific annexation of foregoing circuit, the operation principle of the light adjusting circuit provided the present embodiment is said
It is bright：
Resistance 201, resistance 203, resistance 204 and filter capacitor 202 constitute a bleeder circuit, sample by after rectifier bridge
Busbar voltage, obtain comprising access light modulator after by the voltage signal V of tangent informationPD(α,θ).In detection by tangent steamed bun ripple
Path on, using diode 205, resistance 206, electric capacity 207 and voltage-stabiliser tube 208 constitute first detection circuit, for examining
Survey the peak value V by voltage after rectifier bridgeDIM(α,θ).External control circuit is according to the V for samplingPD(α, θ) and VDIM(α, θ) this
Two voltage signals adjust output current size, realize light modulation.
In compensation circuit 220, resistance 213, resistance 214, electric capacity 215 constitute an electricity for providing dynamic compensation reference point
Road, the tie point for defining resistance 213 and resistance 214 is a points.It is smaller at dimmer conduction angle, i.e., in rectifier bridge rear end bus electricity
Pressure by phase corner cut it is larger when, the current potential of a points can be smaller.It is larger at dimmer conduction angle, i.e., in rectifier bridge rear end busbar voltage quilt
When phase corner cut is smaller, the point position of a points can be larger, the so dynamic current potential for changing compensation reference point.
Specifically, when dimmer conduction angle is larger, because Va values are larger, the Vbe of triode 210 is smaller, three poles
Pipe 210 is operated in by area, and compensation circuit can not provide compensation electric current.Now, VDIM(α, θ) is the peak value of detection signal, typically
This when, 90 ° are less than by phase corner cut α, the angle of flow with light modulator slowly diminishes, i.e., when slowly becoming big by phase corner cut α, Va
Value is tapered into.After the Vbe pressure drops of triode 210 reach 0.4V, compensation circuit starts to intervene work, then flows through colelctor electrode
Electric current be equal to and flow through the electric current of emitter stage：
This current flowing resistance 206 and electric capacity 207 so that VDIM(α, θ) is compensated and becomes big, hereafter VDIM(α, θ) meeting
Become big with big by the change of phase corner cut α, until by 208 clampers of voltage-regulator diode.
It should be noted that in above-mentioned formula, R211 is the resistance of resistance 211, Va is the magnitude of voltage of reference point a.Adjusting
In photoreduction process, with the change at dimmer conduction angle, compensation circuit reference potential point changes, so as to change compensation electric current
Size so that the change of VDIM voltage occurrence dynamics, controller according toThe change of value and algorithm, determine output electricity
The size of stream, realizes light modulation, simultaneously because the participation of compensation circuit causes that the dimming mode of the present embodiment can adapt to NEMA songs
Line requirement and energy depth light modulation.As shown in figure 8, wherein, curve 601 and curve 604 be respectively incandescent lamp curve the upper limit and
Lower limit, curve 603 is incandescent lamp curve, and curve 602 is that increased the curve that the output current after compensation circuit is formed, almost
Close to incandescent lamp curve 603.
In addition to the implementation, present invention also offers a kind of LED electric power systems of adaptation NEMA curves, including：Light modulation
Device, rectifier bridge and the above-mentioned light adjusting circuit of any one.Its light modulation principle is referring to above-described embodiment, then this not repeated description.
In sum：The invention provides a kind of LED light-dimming methods of adaptation NEMA curves, it is applied to light modulator
LED electric power systems in, the LED electric power systems control power switch to be powered for LED by controller, by obtain first electricity
The instantaneous value and peak value of pressure.And using the peak value of the instantaneous value of the first voltage and the first voltage as the control
The input of device, makes the first output current of the LED electric power systems output adapt to NEMA curves.Wherein, first voltage is to flow through
Light modulator and rectifier bridge by tangent DC voltage, it is seen then that use this method, can be according to the peak value of first voltage and wink
Duration regulate and control output current size, and then cause LED match with existing controllable silicon dimmer, i.e., the light modulation of LED with
The incandescent lamp curve of NEMA matches.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For the device that embodiment is provided
For, because it is corresponding with the method that embodiment is provided, so description is fairly simple, related part is said referring to method part
It is bright.
The described above of the embodiment to being provided, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principle provided in this article and features of novelty phase one
The scope most wide for causing.
Claims (9)
1. a kind of LED light-dimming methods of adaptation NEMA curves, are applied in the LED electric power systems with light modulator, and the LED is supplied
Electric system controls power switch to be powered for LED by controller, it is characterised in that including：
Obtain the instantaneous value and peak value of first voltage, the first voltage be flow through light modulator and rectifier bridge by tangent
DC voltage；
The angle of flow according to the light modulator is compensated to the peak value of the first voltage, make the peak value of the first voltage with
The reduction of the angle of flow of the light modulator and increase；
Using the peak value of the instantaneous value of the first voltage and the first voltage as the input of the controller, make described
First output current of LED electric power systems output adapts to NEMA curves.
2. LED light-dimming methods according to claim 1, it is characterised in that the controller is made described by preset algorithm
First constant output current.
3. LED light-dimming methods according to claim 2, it is characterised in that the preset algorithm is：
Wherein, Rcs is the value of controller CS ends resistance, and α is light modulation
Device in light modulation it is corresponding sometime by tangent angle, θ is the input voltage phase angle at a time of light modulator,
K is the value set according to output voltage and bearing power, and I0_mean is first output current, VPD(α, θ) is described
The instantaneous value of first voltage, VDIM(α, θ) is the peak value of the first voltage.
4. a kind of LED light adjusting circuits of adaptation NEMA curves, are applied to control power switch for LED powers by controller
LED electric power systems, it is characterised in that including：First detection circuit, the second detection circuit, compensation circuit, controller and light modulation
Device；
The first detection circuit is connected with the output end of the light modulator, for obtaining that the light modulator exports by tangent
The instantaneous value of DC voltage；
The second detection circuit is connected with the described first detection circuit, for obtaining the peak by tangent DC voltage
Value；
It is connected with the described second detection circuit, the angle of flow according to the light modulator is to the peak value by tangent DC voltage
Compensate, the compensation electricity increased the reduction for making the angle of flow of the peak value by tangent DC voltage with the light modulator
Road；
The controller receive the DC voltage instantaneous value and compensation after peak value, and power for regulating and controlling the LED and be
First output current of system so that first output current is controlled to adapt to NEMA curves by the light modulator.
5. LED light adjusting circuits according to claim 4, it is characterised in that also including with the described first detection circuit and
The second detection circuit is connected, according to described by the instantaneous value of tangent DC voltage and described by tangent DC voltage
Peak value, according to preset formula, be calculated the processor of the first output current.
6. LED light adjusting circuits according to claim 5, it is characterised in that the preset formula is：
Wherein, Rcs is the value of controller CS ends resistance, and α is light modulation
Device in light modulation it is corresponding sometime by tangent angle, θ is the input voltage phase angle at a time of light modulator,
I0_mean is first output current, VPD(α, θ) is the instantaneous value by tangent DC voltage, VDIM(α, θ) is institute
State by the peak value of tangent DC voltage, k is setting value.
7. LED light adjusting circuits according to claim 4, it is characterised in that the first detection circuit include first resistor,
Second resistance, 3rd resistor and the first electric capacity；The second detection circuit includes the first diode, the 4th resistance, the second electricity
Appearance, the first voltage-stabiliser tube and the 5th resistance；
The output end of the first termination rectifier bridge of the first resistor；Second end of the first resistor is electric with described first respectively
The first end of the first end of appearance and the second resistance is connected, and as the first signal output of the described first detection circuit
End；Second end of the second resistance respectively with the first end and the anode phase of first diode of the 3rd resistor
Even；The negative electrode of first diode first end, the first end of second electric capacity, described respectively with the 4th resistance
The first end of the negative electrode of one voltage-stabiliser tube and the 5th resistance is connected, and defeated as the secondary signal of the described second detection circuit
Go out end；Second end of first electric capacity, the second end of the 3rd resistor, the second end, described second of the 4th resistance
The anode of the second end of electric capacity and first voltage-stabiliser tube is grounded.
8. LED light adjusting circuits according to claim 4, it is characterised in that the compensation circuit includes：6th resistance, open
Guan Guan, the second diode, the 7th resistance, the 8th resistance and the 3rd electric capacity；
The first end of the 6th resistance is connected with the negative electrode of second diode, and connects power Vcc；6th resistance
Second end is connected with the input of the switching tube；The output end of the switching tube is connected with the described second detection circuit；It is described
The control end of switching tube anode respectively with second diode, the first end of the 7th resistance, the 8th resistance
The first end of first end and the 3rd electric capacity is connected, the second end of the 8th resistance and the second end of the 3rd electric capacity
It is connected, and ground connection；Second end of the 7th resistance is connected with the output end of rectifier bridge.
9. a kind of LED electric power systems of adaptation NEMA curves, it is characterised in that including：In rectifier bridge and such as claim 4-8
Light adjusting circuit described in any one.
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| BR112014008524A2 (en) * | 2011-10-14 | 2017-04-18 | Koninklijke Philips Nv | method of determining the amount of light generation from a solid state lighting unit, and, solid state lighting unit configured to connect to a dimmer in a dimmer circuit |
| CN202455604U (en) * | 2012-01-04 | 2012-09-26 | 浙江英飞特节能技术有限公司 | Phase angle detection circuit, load driver and light source adjuster |
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2014
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| CN102625520A (en) * | 2011-01-31 | 2012-08-01 | 美高森美股份有限公司-模拟混合信号集团有限公司 | User control of an led luminaire for a phase cut dimmer |
| CN203368857U (en) * | 2013-07-26 | 2013-12-25 | 安徽国防科技职业学院 | Flyback dimmable LED driving system |
| CN203761643U (en) * | 2014-01-13 | 2014-08-06 | 上海新进半导体制造有限公司 | LED light modulation circuit and LED power supply system adapting to NEMA curve |
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| CN103957622A (en) | 2014-07-30 |
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