CN108882433B - Light-emitting diode lighting device capable of stably dimming and stable dimming method - Google Patents
Light-emitting diode lighting device capable of stably dimming and stable dimming method Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
A light emitting diode lighting device capable of stably dimming and a stable dimming method are provided, the light emitting diode lighting device comprises an alternating voltage dimming control module, a driving circuit module and a light emitting diode module, wherein an alternating voltage with a cut phase angle is output to the driving circuit module by the alternating voltage dimming control module at first, the driving circuit module limits the energy converted to the light emitting diode module by the driving circuit module during dimming according to a set duty ratio limit value, and an output energy storage unit stores the energy and stably reduces the current supplied to the light emitting diode module so as to stably dim the brightness of the light emitting diode module.
Description
Technical Field
The present invention relates to a light emitting diode lighting device and a light adjusting method thereof, and more particularly, to a light emitting diode lighting device and a light adjusting method thereof capable of stably decreasing luminance.
Background
The existing dimmable L ED driving circuit utilizes a bleeder circuit (bleeder circuit) to provide a holding current (holding current) of a TRIAC (TRIAC) in a dimmer, so as to prevent L ED flicker caused by resetting the TRIAC (TRIAC) due to insufficient holding current (holding current), and further extracts an AC voltage signal behind the dimmer to judge a conduction angle and adjust L ED current provided by the driving circuit, thereby achieving the purpose of dimming.
However, the dimmable L ED driver circuit described above has the following disadvantages:
1. because holding currents (holding currents) required by different TRIAC devices (TRIAC) are different in magnitude, in order to meet most dimmers, energy loss generated by a bleeder circuit (bleeder circuit) is large, and the energy efficiency of L ED lamps is often reduced.
2. The method for capturing and judging the AC voltage signal after the dimmer is only suitable for one of a leading edge phase control dimmer (leading edge dimmer) or a trailing edge phase control dimmer (trailing edge dimmer), and the application range of a dimmable L ED lamp is reduced.
3. The component error values of the bleeder circuit (bleeder circuit) or the input voltage extraction circuit are prone to cause L ED current instability, which results in flicker.
Disclosure of Invention
An object of the present invention is to provide a light emitting diode lighting device capable of stably adjusting light, which can avoid the great energy loss and the reduced energy efficiency of L ED lamps.
Another object of the present invention is to provide a stable dimming method for led lighting device that can maintain L ED lamp dimming range.
Another objective of the present invention is to provide a stable dimming method for an led lighting device to avoid flicker caused by unstable output current.
The invention relates to a stable dimming method of a light-emitting diode lighting device, which comprises an alternating voltage dimming control module, a driving circuit module and a light-emitting diode module, wherein the driving circuit module comprises an alternating voltage rectifying and filtering unit, a dimming control unit, a switching type power supply circuit unit and an output energy storage unit, the driving circuit module is respectively and electrically connected to the alternating voltage dimming control module and the light-emitting diode module, the driving circuit module receives phase angle cut alternating voltage output by the alternating voltage dimming control module and converts the energy of the phase angle cut alternating voltage into a stable current in an equal proportion mode to the light-emitting diode module so as to enable the light-emitting diode module to receive light and emit light, and feeding back the output current to the dimming control unit, wherein the dimming method comprises the following steps; (a) the alternating voltage dimming control module outputs an alternating voltage with an uncut phase angle to the driving circuit module, the dimming control unit provides a control signal to the switching type power circuit unit according to the input-output relation, and the switching type power circuit unit converts the energy provided by the alternating voltage dimming control module into a stable current according to the signal provided by the dimming control unit, wherein the stable current is the maximum brightness; (b) setting the duty ratio of a control signal provided by the maximum brightness dimming control unit as a duty ratio limit value; (c) when the ac voltage dimming control module provides a phase-angle-cut ac voltage to the driving circuit module, that is, the energy provided by the ac voltage dimming control module decreases, the duty ratio of the control signal of the dimming control unit is limited, and the energy converted from the switching power circuit unit to the output energy storage unit decreases; and (d) the output energy storage unit stores the conversion energy of the switching type power circuit unit, stably reduces the current supplied to the light-emitting diode module and stably reduces the brightness of the light-emitting diode module.
The invention relates to a light emitting diode lighting device capable of stably dimming, which comprises:
an AC voltage dimming control module, which can be a leading edge type or trailing edge type dimming device and can provide a phase angle cut AC voltage device;
a driving circuit module for converting the energy provided by the ac voltage dimming control module into a constant current, comprising:
an alternating voltage rectifying and filtering unit, which is a device for rectifying and filtering the alternating voltage;
a light modulation control unit, which is a device for providing a control signal of a switching type power circuit unit to maintain a fixed current or stably adjust the current;
a switching power circuit unit, which is a device for converting the energy provided by the AC voltage rectifying and filtering unit into stable current according to the control signal of the dimming control unit by using the switching power circuit principle;
the output energy storage unit is a device for storing the energy converted by the switching type power circuit unit and stably supplying the energy to the light-emitting diode module;
one LED module can be a single or a plurality of LED matrix devices which are connected in series or in parallel.
The invention relates to a light-emitting diode lighting device capable of stably dimming and a stable dimming method, which limit the duty ratio of a control signal when dimming the brightness of a light-emitting diode module, store energy by using an output energy storage unit and stably provide current to the light-emitting diode module, so that the influence of distorted signals on the dimming effect can be avoided, the reduction of the luminous efficiency of the light-emitting diode module due to large energy loss and the flicker phenomenon can be avoided, and the dimming application range of the light-emitting diode module can be maintained, thereby achieving all the purposes.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a block diagram of an LED lighting device with stable dimming according to an embodiment of the present invention;
FIG. 2-1 is a waveform diagram of an AC voltage at an uncut phase angle;
FIG. 2-2 is a waveform diagram of an AC voltage at a leading edge cutting phase angle;
FIGS. 2-3 are waveform diagrams of AC voltages at trailing edge cutting phase angles;
FIG. 3 is a flow chart of a method of stabilizing dimming of the LED lighting device of FIG. 1;
fig. 4-1 is a block diagram of the non-dimming switched constant current L ED driving circuit of fig. 1;
FIG. 4-2 is a flow chart of a control method of the constant current control unit of FIG. 4-1, taking a step-down architecture as an example;
FIG. 4-3 is a flow chart of a control method of the constant current control unit of FIG. 4-1, taking a boost architecture as an example;
FIG. 5-1 is a block diagram of another adjustable optical switching L ED driver circuit of FIG. 1;
FIG. 5-2 is a flow chart of the stable dimming method of FIG. 5-1, taking a buck architecture as an example; and
fig. 5-3 is a flow chart of the stable dimming method of fig. 5-1, which is a boost architecture as an example.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be made on specific embodiments, structures, features and effects of a stable dimming led lighting device and a stable dimming method according to the present invention with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1, the led lighting device of this embodiment includes an ac voltage dimming control module 110, a driving circuit module 120 and an led module 130, where the driving circuit module 120 includes an ac voltage rectifying and filtering unit 121, a dimming control unit 122, a switching power circuit unit 123 and an output energy storage unit 124; the ac voltage dimming control module 110 is electrically connected to the driving circuit module 120 and configured to output an ac voltage (see fig. 2-1) with an uncut phase angle or an ac voltage (see fig. 2-2 and fig. 2-3) with a phase angle cut, the ac voltage rectifying and filtering unit 121 of the driving circuit module 120 is electrically connected to the dimming control unit 122 and the switching power circuit unit 123 and configured to rectify the ac voltage provided by the ac voltage dimming control module into a positive voltage and output the positive voltage to the dimming control unit 122 and the switching power circuit unit 123, the switching power circuit unit 123 is electrically connected to the output energy storage unit 124 and configured to output the power to the output energy storage unit 124 and stored by the output energy storage unit 124 to be output to the led module 130, the dimming control unit 122 receives a current feedback signal of the led module 130 and provides a control signal to the switching power circuit unit 123 The circuit unit 123, the switching power circuit unit 123 converts the electric energy provided by the ac voltage rectifying and filtering unit 121 into a stable current according to the control signal of the dimming control unit.
Referring to fig. 3, as shown in the flowchart of the stable dimming method of the present invention, initially as step 501, the ac voltage dimming control module 110 outputs an ac voltage with an uncut phase angle to the driving circuit module 120, the dimming control unit 122 provides a control signal to the switching power circuit unit 123 according to the current feedback signal of the led module 130, the switching power circuit unit 123 converts the energy provided by the ac voltage dimming control module 110 into a stable current according to the control signal provided by the dimming control unit 122, at this time, the stable current is the maximum brightness, as step 502, the duty ratio of the control signal provided by the dimming control unit 122 with the maximum brightness is set as the duty ratio limit value, as step 503, when the ac voltage dimming control module 110 provides an ac voltage with a cut phase angle to the driving circuit module 120, that is, the energy provided by the ac voltage dimming control module 110 is reduced, the duty ratio of the control signal of the dimming control unit 122 is limited, the energy converted from the switching power circuit unit 123 to the output energy storage unit 124 is reduced, and finally, in step 504, the output energy storage unit 124 stores the energy converted from the switching power circuit unit 123 and stably reduces the current provided to the led module 130, so as to stably reduce the brightness of the led module 130.
Referring to fig. 4-1, a block diagram of a non-dimming switching constant current L ED driving circuit is shown, in which a constant current control unit 312 receives a current feedback signal 314 of a light emitting diode module 320 and provides a control signal 313 to a switching power supply circuit unit 315, a flow of the control method is shown in fig. 4-2, taking a buck architecture as an example, the constant current control unit 312 reads the current feedback signal 314 at a beginning step 601, then compares and determines a feedback current and a current set value at a step 602, outputs an original duty ratio at a step 604 if the feedback current is equal to the current set value, and returns to the step 601 to continue reading the current feedback signal 314, reduces a duty ratio of the control signal at a step 603 if the feedback current is greater than the current set value, outputs the reduced duty ratio at a step 604 and returns to continue reading the feedback current signal 314 at the step 601, amplifies the duty ratio at a step 605 and outputs the amplified duty ratio at a step 604 and returns to the step 601 to continue reading the current feedback signal 314, and repeats so as to maintain a constant current of the light emitting diode.
Referring to fig. 4-1 and 4-3, the flow of the control method is illustrated by taking a boost architecture as an example, first, in step 801, the constant current control unit 312 reads the current feedback signal 314, in step 802, compares and determines a feedback current and a current set value, in step 804, outputs an original duty ratio if the feedback current is equal to the current set value, and returns to step 801 to continue to read the current feedback signal 314, in step 803, if the feedback current is smaller than the current set value, reduces the duty ratio of the control signal, in step 804, outputs the reduced duty ratio, and returns to step 801 to continue to read the current feedback signal 314; if the feedback current is greater than the current setting value, step 805 amplifies the duty cycle of the control signal, step 804 outputs the amplified duty cycle, and step 801 returns to continue reading the current feedback signal 314; the above steps are repeated to maintain the current of the light emitting diode constant.
Referring to fig. 5-1, a block diagram of a driving circuit according to the present invention is similar in structure and function to a block diagram of a non-dimming switching constant current L ED driving circuit, a duty limit unit 417 is added, a dimming control unit 412 receives a current feedback signal 414 of a light emitting diode module 420, generates a control signal to be passed through a duty limit unit 417 and then provides a control signal 413 to a switching power supply circuit unit 415, a flow of a stable dimming method is shown in fig. 5-2, taking a step-down structure as an example, the dimming control unit 412 reads the current feedback signal 414 at the beginning, then compares a feedback current with a current set value at step 702, outputs an original duty control signal at step 704 if the feedback current is equal to the current set value, and returns to step 701 to continue reading the feedback current signal 414, if the feedback current is greater than the current set value, then reduces the control signal at step 703, outputs a reduced duty control signal at step 704, returns to step 701 to continue reading the current feedback signal 414, if the feedback current is less than the current set value, amplifies the control signal at step 706, and returns to step 701 to adjust the duty limit value, and returns to step 701 to output the duty control signal, and returns to adjust the duty limit if the duty limit signal, and returns to step 701, and returns to read the duty limit current limit signal, and returns to step 704.
Referring to fig. 5-1 and 5-3, the flow of the stable dimming method is exemplified by a boost architecture, and initially, in step 901, the dimming control unit 412 reads the current feedback signal 414, in step 902, compares the feedback current with the current set value, if the feedback current is equal to the current set value, in step 904, outputs the original duty ratio control signal, and returns to step 901 to continue reading the current feedback signal 414, if the feedback current is greater than the current set value, in step 903, amplifies the duty ratio of the control signal, in step 904, outputs the amplified duty ratio control signal, and returns to step 901 to continue reading the current feedback signal 414; if the feedback current is smaller than the current setting value, in step 906, the duty ratio of the control signal is reduced, in step 907, if the duty ratio of the reduced control signal is greater than the duty limit value, in step 904, the control signal with the reduced duty ratio is output, and the step 901 is returned to continue to read the current feedback signal 414, if the duty ratio of the reduced control signal is less than or equal to the duty limit value, in step 908, the duty ratio of the control signal is set to be equal to the duty limit value, in step 904, the control signal with the duty limit value is output, and the step 901 is returned to continue to read the current feedback signal 414; the above steps are repeated to adjust the current of the light emitting diode.
The invention relates to a light emitting diode lighting device and a stable dimming method, which can stably dim light, wherein a duty ratio limiting unit is added in a non-dimming switching type constant current L ED driving circuit module, a maximum value of a control signal duty ratio is limited by taking a voltage reduction framework as an example, when the input energy of the non-dimming switching type constant current L ED driving circuit module is reduced, the duty ratio of the control signal is amplified to maintain the energy converted to the light emitting diode module and maintain the constant current, and the input energy of the non-dimming switching type constant current L ED driving circuit module is reduced, the duty ratio limiting unit is added in the non-dimming switching type constant current L ED driving circuit module, the maximum value of the control signal duty ratio is limited by taking the voltage reduction framework as an example, the minimum value of the control signal duty ratio is limited by taking the voltage increase framework as an example, therefore, the energy converted to the light emitting diode module is limited when the brightness of the two frameworks can be reduced, and the reduced current is stably provided for the light emitting diode module by storing energy by an output energy storage unit, therefore, the light regulating effect influenced by distorted signals can be avoided, the light emitting efficiency of the light emitting diode module is reduced, and the light regulating.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. A light-emitting diode lighting device is characterized by comprising an alternating voltage dimming control module, a phase angle switching module and a phase angle switching module, wherein the alternating voltage dimming control module is used for outputting an alternating voltage with an uncut phase angle or outputting an alternating voltage with a cut phase angle;
the driving circuit module is electrically connected with the alternating voltage dimming control module and is used for converting the electric energy provided by the alternating voltage dimming control module into constant current; and
the light-emitting diode module is electrically connected with the drive circuit module and is used for receiving the current output by the drive circuit module so as to be stable and capable of emitting light; wherein the driving circuit module includes:
the alternating voltage rectification filtering unit is used for receiving the alternating voltage output by the alternating voltage dimming control module so as to rectify and filter the voltage;
a light modulation control unit electrically connected with the AC voltage rectification filter unit for receiving the voltage output by the AC voltage rectification filter unit
The switching power circuit unit is electrically connected with the alternating voltage rectifying and filtering unit and the dimming control unit and is used for receiving the voltage output by the alternating voltage rectifying and filtering unit; and
the output energy storage unit is electrically connected with the switching type power circuit unit and is used for receiving and storing the electric energy output by the switching type power circuit unit;
the light modulation control unit is further used for receiving a current feedback signal of the light emitting diode module and providing a control signal to the switching type power circuit unit, and the switching type power circuit unit converts the electric energy provided by the alternating voltage rectification filter unit into a stable current according to the control signal of the light modulation control unit;
the dimming control unit provides the control signal to the switching power supply circuit unit according to the current feedback signal of the light emitting diode module, and the switching power supply circuit unit converts the energy provided by the alternating voltage dimming control module into a stable current according to the control signal provided by the dimming control unit, wherein the stable current is the maximum brightness at the moment; the dimming control unit sets the duty ratio of the control signal provided by the maximum brightness dimming control unit as a duty ratio limit value; when the alternating voltage dimming control module provides the phase-angle cut alternating voltage to the driving circuit module, that is, the energy provided by the alternating voltage dimming control module is reduced, the duty ratio of the control signal of the dimming control unit is limited, and the energy converted to the output energy storage unit by the switching type power circuit unit is reduced; and the output energy storage unit stores the conversion energy of the switching type power supply circuit unit and stably reduces the current provided to the light-emitting diode module so as to stably regulate and reduce the brightness of the light-emitting diode module.
2. The led lighting device of claim 1, wherein the driving circuit module further comprises a duty limiting unit, the duty limiting unit is electrically connected to the dimming control unit and the switching power circuit unit, and the control signal generated by the dimming control unit is provided to the switching power circuit unit through the duty limiting unit.
3. The led lighting device of claim 2, wherein when the dimming control unit reads the current feedback signal, if the feedback current is equal to the current setting value, the dimming control unit outputs the original duty ratio control signal and continues to read the current feedback signal; if the feedback current is larger than the current set value, reducing the duty ratio of the control signal, outputting the control signal with the reduced duty ratio, continuously reading the current feedback signal, if the feedback current is smaller than the current set value, amplifying the duty ratio of the control signal, and comparing the amplified duty ratio of the control signal with the duty ratio limit value.
4. The led lighting device of claim 3, wherein the dimming control unit compares the duty ratio of the amplified control signal with the duty limit value, outputs the amplified duty ratio control signal and continues to read the current feedback signal if the duty ratio of the amplified control signal is smaller than the duty limit value, and sets the duty ratio of the control signal equal to the duty limit value and outputs the duty limit value control signal and continues to read the current feedback signal if the duty ratio of the amplified control signal is greater than or equal to the duty limit value.
5. The led lighting device of claim 2, wherein when the dimming control unit reads the current feedback signal, if the feedback current is equal to the current setting value, the dimming control unit outputs the original duty ratio control signal and continues to read the current feedback signal; if the feedback current is larger than the current set value, amplifying the duty ratio of the control signal, outputting the amplified duty ratio control signal, continuously reading the current feedback signal, if the feedback current is smaller than the current set value, reducing the duty ratio of the control signal, and comparing the reduced duty ratio of the control signal with the duty ratio limit value.
6. The led lighting device of claim 5, wherein when the dimming control unit compares the duty ratio of the control signal with the duty limit value, if the duty ratio of the control signal is greater than the duty limit value, the dimming control unit outputs the control signal with the reduced duty ratio and continues to read the current feedback signal, and if the duty ratio of the control signal is less than or equal to the duty limit value, the dimming control unit sets the duty ratio of the control signal to be equal to the duty limit value, outputs the control signal with the duty limit value, and continues to read the current feedback signal.
7. A stable dimming method of a light emitting diode lighting device comprises an alternating voltage dimming control module, a driving circuit module and a light emitting diode module, wherein the driving circuit module comprises an alternating voltage rectifying and filtering unit, a dimming control unit, a switching type power circuit unit and an output energy storage unit, the driving circuit module is respectively and electrically connected to the alternating voltage dimming control module and the light emitting diode module, the driving circuit module receives a phase angle cut alternating voltage output by the alternating voltage dimming control module and converts the energy of the phase angle cut alternating voltage into a stable current in an equal proportion mode to the light emitting diode module so that the light emitting diode module receives the power to emit light and feeds back the output current to the dimming control unit, the method for adjusting the light is characterized by comprising the following steps
a) The alternating voltage dimming control module outputs an alternating voltage with an uncut phase angle to the driving circuit module, the dimming control unit provides a control signal to the switching type power circuit unit according to a current feedback signal of the light emitting diode module, and the switching type power circuit unit converts energy provided by the alternating voltage dimming control module into a stable current according to the signal provided by the dimming control unit, wherein the stable current is the maximum brightness;
b) setting the duty ratio of a control signal provided by the maximum brightness dimming control unit as a duty ratio limit value;
c) when the alternating voltage dimming control module provides a phase-angle cut alternating voltage to the driving circuit module, namely the energy provided by the alternating voltage dimming control module is reduced, the duty ratio of the control signal of the dimming control unit is limited, and the energy converted from the switching type power circuit unit to the output energy storage unit is reduced; and
d) the output energy storage unit stores the conversion energy of the switching type power supply circuit unit and stably reduces the current provided to the light emitting diode module so as to stably adjust and reduce the brightness of the light emitting diode module.
8. The stable dimming method of claim 7, wherein the driving circuit module further comprises a duty limiting unit, the duty limiting unit is electrically connected to the dimming control unit and the switching power circuit unit, and the control signal generated by the dimming control unit is provided to the switching power circuit unit through the duty limiting unit.
9. The stable dimming method according to claim 8, wherein the step c) comprises a step c1) when the dimming control unit reads the current feedback signal, if the feedback current is equal to the current setting value, outputting the original duty control signal, and continuing to read the current feedback signal; if the feedback current is larger than the set value, reducing the duty ratio of the control signal, outputting the control signal with the reduced duty ratio, continuously reading the current feedback signal, if the feedback current is smaller than the set value, amplifying the duty ratio of the control signal, and comparing the amplified duty ratio of the control signal with the duty ratio limit value.
10. The stable dimming method of claim 9, wherein the step c) comprises a step c2) after the step c1, when the dimming control unit compares the duty ratio of the amplified control signal with the duty limit value, if the duty ratio of the amplified control signal is smaller than the duty limit value, outputting the amplified duty control signal and continuously reading the current feedback signal, and if the duty ratio of the amplified control signal is greater than or equal to the duty limit value, setting the duty ratio of the control signal equal to the duty limit value, outputting the duty limit value control signal and continuously reading the current feedback signal.
11. The stable dimming method according to claim 8, wherein the step c) comprises a step c1) when the dimming control unit reads the current feedback signal, if the feedback current is equal to the current setting value, outputting the original duty control signal, and continuing to read the current feedback signal; if the feedback current is larger than the set value, amplifying the duty ratio of the control signal, outputting the amplified duty ratio control signal, continuously reading the current feedback signal, if the feedback current is smaller than the set value, reducing the duty ratio of the control signal, and comparing the reduced duty ratio of the control signal with the duty ratio limit value.
12. The stable dimming method of claim 11, wherein the step c) comprises a step c2) after the step c1, when the dimming control unit compares the duty ratio of the reduced control signal with the duty limit value, if the duty ratio of the reduced control signal is greater than the duty limit value, outputting the reduced duty control signal and continuously reading the current feedback signal, and if the duty ratio of the reduced control signal is less than or equal to the duty limit value, setting the duty ratio of the control signal equal to the duty limit value, outputting the duty limit control signal and continuously reading the current feedback signal.
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| CN101795517A (en) * | 2010-02-08 | 2010-08-04 | 英飞特电子（杭州）有限公司 | PWM chopping LED driving circuit used for leading edge and/or trailing edge light regulation |
| CN102387627A (en) * | 2010-09-03 | 2012-03-21 | 奥斯兰姆有限公司 | Methods and devices for driving LED (Light Emitting Diode) and regulating light and lighting systems |
| CN102573189A (en) * | 2010-12-27 | 2012-07-11 | 海洋王照明科技股份有限公司 | Step-down light-emitting diode (LED) driving circuit |
| CN102612196A (en) * | 2011-01-20 | 2012-07-25 | 海洋王照明科技股份有限公司 | LED (Light Emitting Diode) constant-current drive circuit and LED lamp using same |
| CN102811525A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
| TWM526245U (en) * | 2016-03-28 | 2016-07-21 | Alitek Technology Corp | Dimmable switching type LED driving circuit without requiring measuring photo corner |
| CN106251811A (en) * | 2016-08-12 | 2016-12-21 | 江西康铭盛光电科技有限公司 | A kind of LED light-dimming method |
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| CN108882433A (en) | 2018-11-23 |
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