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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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
The invention relates to the technical field of switching power supplies, in particular to an LED dimming method, circuit and power supply system suitable for a NEMA curve.
Background
LEDs are gradually replacing incandescent lamps due to their advantages of strong luminous efficiency and long operating life. In order to better meet the use requirements of users, in some cases, the illumination intensity needs to be dimmed.
At present, because the scr dimmer has a wide application in lighting systems such as incandescent lamps and halogen lamps, the scr dimmer occupies a large dimming market. In addition, the american electronics manufacturers association (NEMA) has also promulgated a dimming standard SSL6, in which dimming curves of incandescent lamps are plotted. It can be seen that LEDs need to be compatible with silicon controlled dimmers in order to replace incandescent lamps.
Therefore, it is a problem to be solved at present how to match the LED with the existing scr dimmer so that the dimming of the LED matches the incandescent lamp curve of NEMA.
Disclosure of Invention
In view of this, the present invention provides a method, a circuit and a power supply system for dimming an LED adapted to NEMA curve, so that the LED is matched with the existing thyristor dimmer, and further the dimming of the LED is matched with the curve of the incandescent lamp of NEMA.
In order to achieve the purpose, the invention provides the following technical scheme:
an LED dimming method adapting to a NEMA curve is applied to an LED power supply system with a dimmer, the LED power supply system controls a power switch to supply power to an LED through a controller, and the LED dimming method comprises the following steps:
acquiring an instantaneous value and a peak value of a first voltage, wherein the first voltage is a direct-current voltage which flows through a dimmer and a rectifier bridge and is subjected to phase cut;
and taking the instantaneous value of the first voltage and the peak value of the first voltage as the input of the controller, and enabling the first output current output by the LED power supply system to be adapted to a NEMA curve.
Preferably, the controller makes the first output current constant by a preset algorithm.
Preferably, the preset algorithm is as follows:
wherein, I0_meanIs the first output current, VPD(α, θ) is the instantaneous value of the first voltage, VDIM(α, θ) is a peak value of the first voltage.
Preferably, the method further comprises the following steps:
compensating a peak value of the first voltage according to a conduction angle of the dimmer such that the peak value of the first voltage increases as the conduction angle of the dimmer decreases.
An LED dimming circuit adapting to a NEMA curve is applied to an LED power supply system for controlling a power switch to supply power to an LED through a controller, and comprises: the device comprises a first detection circuit, a second detection circuit, a controller and a dimmer;
the first detection circuit is connected with the output end of the dimmer and is used for acquiring the instantaneous value of the phase-cut direct-current voltage output by the dimmer;
the second detection circuit is connected with the first detection circuit and is used for acquiring the peak value of the tangent direct-current voltage;
the controller receives the instantaneous value and the peak value of the direct current voltage and is used for regulating and controlling a first output current of the LED power supply system, so that the first output current is controlled by the dimmer to be adapted to a NEMA curve.
Preferably, the dc-dc converter further comprises a processor connected to the first detection circuit and the second detection circuit, and configured to calculate the first output current according to a preset formula according to an instantaneous value of the tangent dc voltage and a peak value of the tangent dc voltage.
Preferably, the preset formula is as follows:
wherein, I0_meanIs the first output current, VPD(α, theta) is the instantaneous value of the phase-cut DC voltage, VDIM(α, θ) is the peak value of the phase-cut DC voltage, k is the set value.
Preferably, the method further comprises the following steps:
and a compensation circuit coupled to the second detection circuit for compensating a peak value of the phase-cut DC voltage according to the conduction angle of the dimmer such that the peak value of the phase-cut DC voltage increases as the conduction angle of the dimmer decreases.
Preferably, the first detection circuit includes a first resistor, a second resistor, a third resistor and a first capacitor; the second detection circuit comprises a first diode, a fourth resistor, a second capacitor, a first voltage regulator tube and a fifth resistor;
the first end of the first resistor is connected with the output end of the rectifier bridge; the second end of the first resistor is respectively connected with the first end of the first capacitor and the first end of the second resistor and is used as a first signal output end of the first detection circuit; the second end of the second resistor is respectively connected with the first end of the third resistor and the anode of the first diode; the cathode of the first diode is respectively connected with the first end of the fourth resistor, the first end of the second capacitor, the cathode of the first voltage-regulator tube and the first end of the fifth resistor, and is used as a second signal output end of the second detection circuit; the second end of the first capacitor, the second end of the third resistor, the second end of the fourth resistor, the second end of the second capacitor and the anode of the first voltage regulator tube are all grounded.
Preferably, the compensation circuit includes: the third resistor, the switch tube, the second diode, the seventh resistor, the eighth resistor and the third capacitor are connected in series;
the first end of the sixth resistor is connected with the cathode of the second diode and is connected with a power supply Vcc; the second end of the sixth resistor is connected with the input end of the switching tube; the output end of the switching tube is connected with the second detection circuit; the control end of the switching tube is respectively connected with the anode of the second diode, the first end of the seventh resistor, the first end of the eighth resistor and the first end of the third capacitor, and the second end of the eighth resistor is connected with the second end of the third capacitor and grounded; and the second end of the seventh resistor is connected with the output end of the rectifier bridge.
Preferably, the method comprises the following steps: a dimmer, a rectifier bridge and any one of the dimming circuits.
Compared with the prior art, the LED dimming method adapted to the NEMA curve is provided in the present invention, and is applied to an LED power supply system having a dimmer, wherein the LED power supply system controls a power switch to supply power to an LED through a controller, and obtains an instantaneous value and a peak value of the first voltage. And taking the instantaneous value of the first voltage and the peak value of the first voltage as the input of the controller, so that the first output current output by the LED power supply system is adapted to a NEMA curve. The first voltage is direct current voltage which flows through the dimmer and the rectifier bridge and is tangent, so that the output current can be regulated according to the peak value and the instantaneous value of the first voltage by adopting the method, and the LED is matched with the existing silicon controlled dimmer, namely the dimming of the LED is matched with an incandescent lamp curve of the NEMA.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of an LED dimming method adapted to a NEMA curve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the output voltage waveform of the external AC power source and the waveform of the phase-cut DC voltage;
FIG. 3 is a waveform diagram formed by the instantaneous values of the phase-cut DC voltages;
FIG. 4 is a waveform diagram of the peak formation of the phase-cut DC voltage;
fig. 5 is a graph of an output current of an LED dimming circuit provided by the present embodiment;
fig. 6 is a schematic block diagram of an LED dimming circuit according to the present invention;
fig. 7 is a specific circuit configuration diagram of an LED dimming circuit according to the present invention;
fig. 8 is a graph of an output current after an LED dimming circuit with a compensation circuit according to an embodiment of the present invention is adopted.
Detailed Description
For the sake of reference and clarity, the descriptions, abbreviations or abbreviations of the technical terms used hereinafter are summarized as follows:
NEMA: national Electrical manufacturers Association.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a flowchart of an LED dimming method adapted to a NEMA curve according to the present invention is applied to an LED power supply system having a dimmer, where the LED power supply system controls a power switch to supply power to an LED through a controller, and the method includes the steps of:
s101: the instantaneous value and peak value of the first voltage are obtained.
It should be noted that the first voltage is a phase-cut dc voltage flowing through the dimmer and the rectifier bridge. Fig. 2 is a schematic diagram of an output voltage curve of an external ac power source and a tangent dc voltage curve. In the dimming application, the curve 101 is connected to the dimmer to generate a phase-cut ac voltage, and the phase-cut ac voltage is processed by the rectifier bridge to output a phase-cut dc voltage (i.e., a first voltage) to form a curve 102. Referring to fig. 2, α is a phase-cut angle at a certain time when the dimmer is dimming, i.e., an angle corresponding to a straight line in the horizontal direction in the curve 102 in fig. 2. Accordingly, pi- α is the conduction angle of the dimmer at this time, and θ is the phase angle of the input voltage of the dimmer at a certain time.
Specifically, as can be seen from fig. 2, the instantaneous value of the first voltage is a value on the curve 102 at a certain time, and may be understood as a value corresponding to the curve 102 at a different phase angle θ. While the peak of the first voltage, i.e. the peak of the direct voltage being phase-cut, corresponds to the maximum in the curve 102.
S102: and taking the instantaneous value of the first voltage and the peak value of the first voltage as the input of the controller, and enabling the first output current output by the LED power supply system to be adapted to a NEMA curve.
The preset formula in the above steps may be set according to the actual regulation requirement and the curve of the incandescent lamp, and the controller uses a preset algorithm to make the first output current constant, in this embodiment, the following formula is preferably used:
equation 1
Wherein Rcs is the value of the CS terminal resistance of the controller α is the phase-cut angle of the dimmer at a certain moment in dimming, and accordingly, pi- α is the conduction angle of the dimmer at this moment, θ is the phase angle of the input voltage of the dimmer at a certain moment, k is a value set according to the output voltage and the load power, I0_ mean is the first output current, VPD(α, θ) is the instantaneous value of the first voltage, contains information of the angle of the phase cut, and the waveform is shown in fig. 3. assuming that the ac input voltage is vin (θ) and kPD is the division coefficient, V isPDThe expression (α, θ) is:
equation 2
Where vin refers to the peak input AC voltage and VDIM(α θ) is the peak value of the first voltage, i.e. the peak value of the phase-cut DC voltage when the phase-cut angle is αDIMThe expression (α, θ) is:
equation 3
In addition, V isDIMThe voltage trend of (α, theta) is shown in fig. 4, and the dimming curve obtained from the above equations 1, 2 and 3 is shown in fig. 5, wherein the curves 301 and 304 are the upper limit and the lower limit of the incandescent lamp curve in the NEMA curve, respectively, the curve 303 is the incandescent lamp curve, and the curve 302 is the curve after the present dimming method is adopted.
On the basis of the above embodiment provided by the present invention, in order to satisfy the deep dimming, that is, the dimming curve 302 in fig. 5 needs to be closer to the curve 303 of the incandescent lamp, the present embodiment further includes:
step S103: compensating a peak value of the first voltage according to a conduction angle of the dimmer such that the peak value of the first voltage increases as the conduction angle of the dimmer decreases.
Specifically, referring to fig. 5, comparing the curve 302 with the curve 303, it can be seen that V is obtained after the phase-cut angle is required to reach a certain degree in order to satisfy the deep dimmingDIMThe (α, θ) signal becomes larger as the phase-cut angle becomes larger, i.e. the output current Io can adapt to the requirements of the NEMA dimming curve as the conduction angle changes during dimming, while the output current can be at a smaller level as the conduction angle is smaller.
In summary, with the dimming method provided in this embodiment, V is used for dimmingPD(α, theta) characterizes the information that the input voltage is phase-cut after passing through the dimmer, VDIM(α, theta) represents the peak information of the phase-cut DC voltage, and in order to obtain better dimming effect, the compensation circuit is used for compensating the V-shaped current path after the phase-cut angle α reaches a certain degreeDIM(α, theta) providing compensation, thereafter VDIM(α, theta) is the compensated voltage signal, and then the controller passesTo determine the magnitude of the output current, anThe output current can adapt to the dimming requirement of the NEMA curve by a preset algorithm (can be formula 1), and a better dimming effect can be achieved.
The method is described in detail in the embodiments provided by the present invention, and the method of the present invention can be implemented by using various types of circuits, so that the present invention further provides a dimming circuit, and the following detailed description is given of specific embodiments.
Example two
Referring to fig. 6, a schematic block diagram of an LED dimming circuit adapted to a NEMA curve provided in this embodiment includes: a first detection circuit 221, a second detection circuit 222, a controller, and a dimmer.
Wherein the first detection circuit is connected to the output of the dimmer 223 for obtaining the instantaneous value of the phase-cut dc voltage output by the dimmer. The second detection circuit is connected with the first detection circuit and used for obtaining the peak value of the direct current voltage which is cut.
Preferably, the dimmer further comprises a compensation circuit, connected to the second detection circuit, for compensating the peak value of the phase-cut dc voltage according to the conduction angle of the dimmer, such that the peak value of the phase-cut dc voltage increases as the conduction angle of the dimmer decreases.
Specifically, please refer to fig. 7, which is a specific circuit structure diagram of a dimming circuit provided in this embodiment, wherein the first detection circuit includes a first resistor 201, a second resistor 203, a third resistor 204, and a first capacitor 202. The second detection circuit includes a first diode 205, a fourth resistor 206, a second capacitor 207, a first regulator 208, and a fifth resistor 209.
The connection relationship is as follows:
the first end of the first resistor is connected with the output end of the rectifier bridge. The second end of the first resistor is respectively connected with the first end of the first capacitor and the first end of the second resistor, and is used as a first signal output end of the first detection circuit. The second end of the second resistor is respectively connected with the first end of the third resistor and the anode of the first diode. And the cathode of the first diode is respectively connected with the first end of the fourth resistor, the first end of the second capacitor, the cathode of the first voltage-regulator tube and the first end of the fifth resistor and is used as a second signal output end of the second detection circuit. The second end of the first capacitor, the second end of the third resistor, the second end of the fourth resistor, the second end of the second capacitor and the anode of the first voltage regulator tube are all grounded.
The compensation circuit 220 includes: a sixth resistor 211, a switching tube 210, a second diode 212, a seventh resistor 213, an eighth resistor 214, and a third capacitor 215.
The connection relationship is as follows: and the first end of the sixth resistor is connected with the cathode of the second diode and is connected with the power supply Vcc. And the second end of the sixth resistor is connected with the input end of the switching tube. The output end of the switch tube is connected with the second detection circuit. The control end of the switch tube is respectively connected with the anode of the second diode, the first end of the seventh resistor, the first end of the eighth resistor and the first end of the third capacitor, and the second end of the eighth resistor is connected with the second end of the third capacitor and grounded. And the second end of the seventh resistor is connected with the output end of the rectifier bridge.
The circuit is used for sampling a peak value and an instantaneous value of the tangent direct-current voltage, the embodiment also sends the peak value and the instantaneous value acquired by the circuit to the controller, and the processor calculates a first output current according to a preset formula according to the instantaneous value of the tangent direct-current voltage and the peak value of the tangent direct-current voltage. It should be noted that the controller may be a controller of model AP1690 manufactured by BCD, but may also be another controller, and is not limited thereto.
Preferably, the preset formula is as follows:
wherein,I0_meanis the first output current, VPD(α, theta) is the instantaneous value of the phase-cut DC voltage, VDIM(α, θ) is the peak of the phase-cut DC voltage.
The operation principle of the dimming circuit provided in this embodiment is described with reference to the specific connection relationship of the circuits:
the resistor 201, the resistor 203, the resistor 204 and the filter capacitor 202 form a voltage division circuit, and the voltage of the bus passing through the rectifier bridge is sampled to obtain a voltage signal V containing information of being tangent after being connected to the dimmerPD(α theta.) on the path of the detected tangent steamed bread wave, a first detection circuit composed of a diode 205, a resistor 206, a capacitor 207 and a voltage regulator 208 is used for detecting the peak value V of the voltage after passing through the rectifier bridgeDIM(α, theta.) the external control circuit is based on the sampled VPD(α, theta) and VDIM(α, theta) the two voltage signals adjust the output current to realize dimming.
In the compensation circuit 220, the resistor 213, the resistor 214, and the capacitor 215 form a circuit providing a reference point for dynamic compensation, and the connection point of the resistor 213 and the resistor 214 is defined as point a. When the conduction angle of the dimmer is small, namely when the bus voltage at the rear end of the rectifier bridge is subjected to a larger phase-cut angle, the potential at the point a is smaller. When the conduction angle of the dimmer is large, namely when the bus voltage at the rear end of the rectifier bridge is subjected to a small phase-cut angle, the point position of the point a is large, and the potential of the compensation reference point is dynamically changed.
Specifically, when the conduction angle of the dimmer is large, the Vbe of the transistor 210 is small due to the large Va value, the transistor 210 operates in the cut-off region, and the compensation circuit cannot provide the compensation current. At this time, VDIM(α, θ) is the peak value of the detection signal, typically at this time, by the phase cut angle α being less than 90 °, Va becomes progressively smaller as the conduction angle of the dimmer becomes progressively smaller, i.e., by the phase cut angle α becoming progressively larger, the compensation circuit becomes active when the Vbe voltage drop of the transistor 210 reaches 0.4V, at which time the current through the collector equals the current through the emitter:
this current flows through resistor 206 and capacitor 207, causing V to flowDIM(α, theta) is compensated to become large, and thereafter VDIM(α, θ) becomes larger as the phase cut angle α becomes larger until it is clamped by the zener diode 208.
In the above formula, R211 is the resistance of the resistor 211, and Va is the voltage value of the reference point a. In the dimming process, the reference point potential of the compensation circuit changes along with the change of the conduction angle of the dimmer, so that the magnitude of the compensation current is changed, the VDIM voltage is dynamically changed, and the controller controls the current according to the change of the reference point potential of the compensation circuitThe value change and the algorithm determine the magnitude of the output current to realize dimming, and meanwhile, due to the participation of the compensation circuit, the dimming mode of the embodiment can adapt to the NEMA curve requirement and can realize deep dimming. As shown in fig. 8, where curves 601 and 604 are the upper and lower limits of the incandescent lamp curve, respectively, curve 603 is the incandescent lamp curve, and curve 602 is the curve formed by adding the output current after the compensation circuit, almost approaching the incandescent lamp curve 603.
In addition to the above embodiments, the present invention further provides an LED power supply system adapted to a NEMA curve, including: a dimmer, a rectifier bridge and any one of the above dimming circuits. The dimming principle is described in the above embodiments, and the description is not repeated here.
In summary, the following steps: the invention provides an LED dimming method adapting to a NEMA curve, which is applied to an LED power supply system with a dimmer, wherein the LED power supply system controls a power switch to supply power to an LED through a controller, and the instantaneous value and the peak value of a first voltage are obtained. And taking the instantaneous value of the first voltage and the peak value of the first voltage as the input of the controller, so that the first output current output by the LED power supply system is adapted to a NEMA curve. The first voltage is direct current voltage which flows through the dimmer and the rectifier bridge and is tangent, so that the output current can be regulated according to the peak value and the instantaneous value of the first voltage by adopting the method, and the LED is matched with the existing silicon controlled dimmer, namely the dimming of the LED is matched with an incandescent lamp curve of the NEMA.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the device provided by the embodiment, the description is relatively simple because the device corresponds to the method provided by the embodiment, and the relevant points can be referred to the method part for description.
The previous description of the provided embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features provided herein.
Claims (9)
1. An LED dimming method adapting to a NEMA curve is applied to an LED power supply system with a dimmer, the LED power supply system controls a power switch to supply power to an LED through a controller, and the LED dimming method is characterized by comprising the following steps:
acquiring an instantaneous value and a peak value of a first voltage, wherein the first voltage is a direct-current voltage which flows through a dimmer and a rectifier bridge and is subjected to phase cut;
compensating a peak value of the first voltage according to a conduction angle of the dimmer, so that the peak value of the first voltage increases along with the reduction of the conduction angle of the dimmer;
and taking the instantaneous value of the first voltage and the peak value of the first voltage as the input of the controller, and enabling the first output current output by the LED power supply system to be adapted to a NEMA curve.
2. The LED dimming method of claim 1, wherein the controller makes the first output current constant by a preset algorithm.
3. The LED dimming method of claim 2, wherein the predetermined algorithm is:
wherein Rcs is a value of a CS terminal resistor of the controller, α is a phase-cut angle of the dimmer at a certain time corresponding to dimming, θ is a phase angle of an input voltage of the dimmer at a certain time, k is a value set according to the output voltage and the load power, I0_ mean is the first output current, V is a value of the first output current, and V is a value of the second output currentPD(α, θ) is the instantaneous value of the first voltage, VDIM(α, θ) is a peak value of the first voltage.
4. An LED dimming circuit adapting to a NEMA curve, which is applied to an LED power supply system for controlling a power switch to supply power to an LED through a controller, and is characterized by comprising: the device comprises a first detection circuit, a second detection circuit, a compensation circuit, a controller and a dimmer;
the first detection circuit is connected with the output end of the dimmer and is used for acquiring the instantaneous value of the phase-cut direct-current voltage output by the dimmer;
the second detection circuit is connected with the first detection circuit and is used for acquiring the peak value of the tangent direct-current voltage;
a compensation circuit connected to the second detection circuit for compensating a peak value of the phase-cut DC voltage according to a conduction angle of the dimmer, such that the peak value of the phase-cut DC voltage increases as the conduction angle of the dimmer decreases;
the controller receives the instantaneous value and the compensated peak value of the direct current voltage and is used for regulating and controlling a first output current of the LED power supply system, so that the first output current is controlled by the dimmer to be adapted to a NEMA curve.
5. The LED dimming circuit of claim 4, further comprising a processor coupled to the first detection circuit and the second detection circuit for calculating the first output current according to a predetermined formula based on an instantaneous value of the phase-cut DC voltage and a peak value of the phase-cut DC voltage.
6. The LED dimming circuit of claim 5, wherein the predetermined formula is:
wherein Rcs is the value of the CS terminal resistor of the controller, α is the phase-cut angle of the dimmer at a certain time, θ is the phase angle of the input voltage of the dimmer at a certain time, I0_ mean is the first output current, V0 _ mean is the first output current, andPD(α, theta) is the instantaneous value of the phase-cut DC voltage, VDIM(α, θ) is the peak value of the phase-cut DC voltage, k is the set value.
7. The LED dimming circuit of claim 4, wherein the first detection circuit comprises a first resistor, a second resistor, a third resistor, and a first capacitor; the second detection circuit comprises a first diode, a fourth resistor, a second capacitor, a first voltage regulator tube and a fifth resistor;
the first end of the first resistor is connected with the output end of the rectifier bridge; the second end of the first resistor is respectively connected with the first end of the first capacitor and the first end of the second resistor and is used as a first signal output end of the first detection circuit; the second end of the second resistor is respectively connected with the first end of the third resistor and the anode of the first diode; the cathode of the first diode is respectively connected with the first end of the fourth resistor, the first end of the second capacitor, the cathode of the first voltage-regulator tube and the first end of the fifth resistor, and is used as a second signal output end of the second detection circuit; the second end of the first capacitor, the second end of the third resistor, the second end of the fourth resistor, the second end of the second capacitor and the anode of the first voltage regulator tube are all grounded.
8. The LED dimming circuit of claim 4, wherein the compensation circuit comprises: the third resistor, the switch tube, the second diode, the seventh resistor, the eighth resistor and the third capacitor are connected in series;
the first end of the sixth resistor is connected with the cathode of the second diode and is connected with a power supply Vcc; the second end of the sixth resistor is connected with the input end of the switching tube; the output end of the switching tube is connected with the second detection circuit; the control end of the switching tube is respectively connected with the anode of the second diode, the first end of the seventh resistor, the first end of the eighth resistor and the first end of the third capacitor, and the second end of the eighth resistor is connected with the second end of the third capacitor and grounded; and the second end of the seventh resistor is connected with the output end of the rectifier bridge.
9. An LED power supply system that adapts to a NEMA curve, comprising: a rectifier bridge and a dimming circuit as claimed in any one of claims 4 to 8.
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102421226B (en) * | 2011-09-06 | 2014-05-07 | 上海新进半导体制造有限公司 | LED (light-emitting diode) dimming driving circuit |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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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