CN116209119B - DALI dimming power supply load detection circuit and method - Google Patents
DALI dimming power supply load detection circuit and method Download PDFInfo
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- CN116209119B CN116209119B CN202310273991.XA CN202310273991A CN116209119B CN 116209119 B CN116209119 B CN 116209119B CN 202310273991 A CN202310273991 A CN 202310273991A CN 116209119 B CN116209119 B CN 116209119B
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective 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]
- H05B45/40—Details of LED load circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The application provides a DALI dimming power supply load detection circuit and a method, wherein a singlechip sub-circuit outputs the level of a preset duty ratio to an LED dimming sub-circuit so as to lighten a lamp, and simultaneously outputs the effective level to a control sub-circuit, and the control sub-circuit outputs the level on the negative electrode of the lamp to a load detection sub-circuit; the value of the preset duty cycle is less than 100%; the singlechip sub-circuit also detects the load detection sub-circuit, and when the detection result shows that signal jump occurs, the DALI dimming power supply is judged to be connected with the load to work; when the lamp is disconnected, the singlechip subcircuit also detects the load detection subcircuit, and when the detection result is an invalid level, the DALI dimming power supply is judged to be in an open circuit state; when the DALI dimming power supply enters standby, the singlechip subcircuit outputs an invalid level to the LED dimming subcircuit so as to turn off the lamp. Meanwhile, the singlechip sub-circuit outputs an invalid level to the control sub-circuit so as to close the loop current flowing through the control sub-circuit by the lamp, thereby eliminating the afterglow of the lamp.
Description
Technical Field
The application relates to the technical field of LED dimming power supplies, in particular to a DALI dimming power supply load detection circuit and a DALI dimming power supply load detection method.
Background
Along with the continuous improvement of technology and technology, the LED dimming power supply is also selected by more people, and currently, LEDs on the market have various dimming modes. The DALI intelligent lighting control dimming has the advantages of strong anti-interference performance, fault information feedback, standard protocol, special authentication and the like, and is favored by the market. According to the requirements of the DALI protocol, during normal operation of the DALI dimming power supply, the DALI system must detect a load condition of the DALI dimming power supply, such as an open load, and the DALI dimming power supply needs to communicate the open state to the DALIA system.
Most of the current methods in the market are to connect resistors in series in a load loop and then detect the current in the load loop to determine whether the load loop is open, and the detection method has disadvantages. When the DALI dimming power supply is dimmed to a duty cycle of 0.01%, the current becomes 0.01% of the rated current, and at this time, the load state is difficult to detect, and the load state is generally detected in cooperation with the dimming end of the LED dimming power supply. However, when the dimming end of the LED dimming power supply is used for detection, the phenomenon that the LED has afterglow when the power supply is in standby exists. It is therefore necessary to develop a DALI dimming power supply load detection circuit and method.
Disclosure of Invention
In order to overcome the defects in the prior art, the application aims to provide a DALI dimming power supply load detection circuit and a DALI dimming power supply load detection method.
In order to achieve the above object, the present application provides the following solutions:
a DALI dimming power supply load detection circuit, comprising:
the LED dimming circuit comprises a power supply sub-circuit, an LED dimming sub-circuit, a singlechip sub-circuit, a control sub-circuit and a load detection sub-circuit; the singlechip sub-circuit is respectively connected with the LED dimming sub-circuit, the control sub-circuit and the load detection sub-circuit; one end of the LED dimming sub-circuit is also connected with the power supply sub-circuit, and the other end of the LED dimming sub-circuit is also connected with the control circuit and the negative electrode of the lamp; the control sub-circuit is also connected with the load detection sub-circuit; the power supply subcircuit is also connected with the positive electrode of the lamp;
the singlechip sub-circuit is used for outputting the level of a preset duty ratio to the LED dimming sub-circuit so as to lighten the lamp, and simultaneously outputting the effective level to the control sub-circuit, and the control sub-circuit is used for outputting the level on the cathode of the lamp to the load detection sub-circuit; the value of the preset duty cycle is less than 100%; the singlechip subcircuit is also used for detecting the load detection subcircuit, and when a signal jump occurs in a detection result, the DALI dimming power supply is judged to be connected with a load to work; when the lamp is disconnected, the singlechip subcircuit is also used for detecting the load detection subcircuit, and when the detection result is an invalid level, the DALI dimming power supply is judged to be in an open circuit state; when the DALI dimming power supply enters standby, the singlechip subcircuit outputs an invalid level to the LED dimming subcircuit so as to turn off the lamp; meanwhile, the singlechip sub-circuit outputs an invalid level to the control sub-circuit so as to close the loop current flowing through the control sub-circuit by the lamp, thereby eliminating the afterglow of the lamp.
Preferably, the calculation formula of the duty ratio value of the level on the negative electrode of the lamp is D 2 ＝1-D 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein D is 2 A duty ratio value D of the level on the negative electrode 1 Is saidThe percentage value of the duty cycle is preset.
Preferably, the power supply sub-circuit is further connected to a live wire, a neutral wire, a ground wire and a supply voltage of the mains supply, respectively.
Preferably, the LED dimmer sub-circuit comprises: the first NMOS tube, the first resistor and the second resistor;
the drain electrode of the first NMOS tube is respectively connected with the negative electrode of the lamp and the control sub-circuit; the grid electrode of the first NMOS tube is respectively connected with one end of the first resistor and one end of the second resistor; the other end of the first resistor is connected with the source electrode of the first NMOS tube and the power supply subcircuit respectively; the other end of the second resistor is connected with the singlechip sub-circuit.
Preferably, the control sub-circuit comprises: a photo coupler and a fifth resistor;
the fifth resistor is respectively connected with the first end of the photoelectric coupler and the singlechip sub-circuit; the second end of the photoelectric coupler is connected with a ground wire; the third end of the photoelectric coupler is connected with the load detection subcircuit; and the fourth end of the photoelectric coupler is respectively connected with the negative electrode of the lamp and the LED dimming sub-circuit.
Preferably, the load detection subcircuit includes a first diode, a sixth resistor, and a seventh resistor;
the cathode of the first diode is respectively connected with one end of the sixth resistor and the control sub-circuit; the anode of the first diode is respectively connected with the other end of the sixth resistor and the singlechip sub-circuit; the other end of the sixth resistor is also connected with one end of the seventh resistor; the other end of the seventh resistor is also connected with a ground wire.
Preferably, the number of the LED dimming sub-circuits, the control sub-circuits and the load detection sub-circuits is determined by the number of the cathodes of the lamp.
A DALI dimming power supply load detection method for eliminating LED afterglow is applied to the DALI dimming power supply load detection circuit, and the method comprises the following steps:
outputting a level with a preset duty ratio to the LED dimming sub-circuit by utilizing the singlechip sub-circuit so as to lighten the lamp and simultaneously outputting an effective level to the control sub-circuit;
outputting the level on the negative electrode of the lamp to a load detection sub-circuit by using a control sub-circuit;
detecting a load detection sub-circuit by utilizing a singlechip sub-circuit, and judging that the DALI dimming power supply is connected with a load to work when a signal jump occurs in a detection result;
when the lamp is disconnected, the load detection subcircuit is detected by the singlechip subcircuit, and when the detection result is an invalid level, the DALI dimming power supply is judged to be in an open circuit state;
when the DALI dimming power supply enters standby, an invalid level is output to the control sub-circuit by utilizing the single chip microcomputer sub-circuit so as to close the loop current of the lamp, and afterglow is eliminated.
According to the specific embodiment provided by the application, the application discloses the following technical effects:
the application provides a DALI dimming power supply load detection circuit and a method, wherein the circuit comprises: the LED dimming circuit comprises a power supply sub-circuit, an LED dimming sub-circuit, a singlechip sub-circuit, a control sub-circuit and a load detection sub-circuit; the singlechip sub-circuit is respectively connected with the LED dimming sub-circuit, the control sub-circuit and the load detection sub-circuit; one end of the LED dimming sub-circuit is also connected with the power supply sub-circuit, and the other end of the LED dimming sub-circuit is also connected with the control circuit and the negative electrode of the lamp; the control sub-circuit is also connected with the load detection sub-circuit; the power supply subcircuit is also connected with the positive electrode of the lamp; the singlechip sub-circuit is used for outputting the level of a preset duty ratio to the LED dimming sub-circuit so as to lighten the lamp, and simultaneously outputting the effective level to the control sub-circuit, and the control sub-circuit is used for outputting the level on the cathode of the lamp to the load detection sub-circuit; the value of the preset duty cycle is less than 100%; the singlechip subcircuit is also used for detecting the load detection subcircuit, and when a signal jump occurs in a detection result, the DALI dimming power supply is judged to be connected with a load to work; when the lamp is disconnected, the singlechip subcircuit is also used for detecting the load detection subcircuit, and when the detection result is an invalid level, the DALI dimming power supply is judged to be in an open circuit state; when the DALI dimming power supply enters standby, the singlechip subcircuit outputs an invalid level to the LED dimming subcircuit so as to turn off the lamp. Meanwhile, the singlechip sub-circuit outputs an invalid level to the control sub-circuit so as to close the loop current flowing through the control sub-circuit by the lamp, thereby eliminating the afterglow of the lamp. The application can avoid the phenomenon that the LED has afterglow when the power supply is standby.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of an embodiment 1 of the present application;
fig. 2 is a schematic circuit diagram of embodiment 2 of the present application;
fig. 3 is a schematic circuit diagram of embodiment 3 of the present application;
fig. 4 is a flowchart of a method provided in embodiment 4 of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The terms "first," "second," "third," and "fourth" and the like in the description and in the claims and drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, inclusion of a list of steps, processes, methods, etc. is not limited to the listed steps but may alternatively include steps not listed or may alternatively include other steps inherent to such processes, methods, products, or apparatus.
The application aims to provide a DALI dimming power supply load detection circuit and a DALI dimming power supply load detection method, which can avoid the phenomenon that LEDs and afterglow appear when a power supply is in standby.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
Example 1:
fig. 1 is a schematic circuit diagram provided in embodiment 1 of the present application, and as shown in fig. 1, the present application provides a DALI dimming power supply load detection circuit, including:
the LED dimming circuit comprises a power supply sub-circuit, an LED dimming sub-circuit, a singlechip sub-circuit, a control sub-circuit and a load detection sub-circuit; the singlechip sub-circuit is respectively connected with the LED dimming sub-circuit, the control sub-circuit and the load detection sub-circuit; one end of the LED dimming sub-circuit is also connected with the power supply sub-circuit, and the other end of the LED dimming sub-circuit is also connected with the control circuit and a negative LED-1 of the lamp; the control sub-circuit is also connected with the load detection sub-circuit; the power supply subcircuit is also connected with an anode LED+ of the lamp;
the singlechip sub-circuit is used for outputting the level of a preset duty ratio to the LED dimming sub-circuit so as to lighten the lamp, and simultaneously outputting the effective level to the control sub-circuit, and the control sub-circuit is used for outputting the level on the cathode of the lamp to the load detection sub-circuit; the value of the preset duty cycle is less than 100%; the singlechip subcircuit is also used for detecting the load detection subcircuit, and when a signal jump occurs in a detection result, the DALI dimming power supply is judged to be connected with a load to work; when the lamp is disconnected, the singlechip subcircuit is also used for detecting the load detection subcircuit, and when the detection result is an invalid level, the DALI dimming power supply is judged to be in an open circuit state; when the DALI dimming power supply enters standby, the singlechip subcircuit outputs an invalid level to the LED dimming subcircuit so as to turn off the lamp; meanwhile, the singlechip sub-circuit outputs an invalid level to the control sub-circuit so as to close the loop current flowing through the control sub-circuit by the lamp, thereby eliminating the afterglow of the lamp.
The calculation formula of the duty ratio value of the level on the negative electrode of the lamp is that D2=1-D1; wherein D2 is a duty cycle value of the level on the negative electrode, and D1 is a percentage value of the preset duty cycle. The power supply sub-circuit is also respectively connected with a live wire L, a null wire N, a ground wire GNS and a power supply voltage VCC of the commercial power.
Example 2:
as shown in fig. 2, as a specific refinement of the circuit structure in embodiment 1, when the system is powered on in this embodiment, the live wire L and the neutral wire N are connected to the power supply sub-circuit through terminals, and after being processed by the power supply sub-circuit, the voltage terminal (positive electrode led+) of the lamp, the dimming terminal (negative electrode LED-1 of the lamp), the power supply voltage VCC and the ground wire GNS are respectively output. And the lamp is connected to the two ends of the voltage terminal LED+ and the dimming terminal LED-1. The single chip microcomputer sub-circuit outputs a level with the duty ratio of 99.9%, the first NMOS tube Q1 is conducted through the first resistor R1 and the second resistor R2, the first NMOS tube Q1 pulls down the dimming terminal LED-1 to the ground GNS, and at the moment, the LED (lamp) lights. Meanwhile, the single-chip microcomputer sub-circuit outputs an effective level (high-level signal), the photoelectric coupler U2 is conducted through the fifth resistor R5, and the photoelectric coupler U2 divides the level of the duty ratio 0.1 percent (1-99.9 percent) on the dimming terminal LED-1 through the sixth resistor R6 and the seventh resistor R7 and then is connected to the detection pin of the single-chip microcomputer sub-circuit. As long as the detection pin of the singlechip subcircuit is set to detect falling edge interruption, the DALI dimming power supply is judged to be on as long as the detection pin of the singlechip subcircuit detects the falling edge. The effect of the first diode D1 is to provide a faster discharge loop for the falling edge. When the lamp is disconnected, the detection pin of the singlechip subcircuit is pulled down to the ground GNS through the seventh resistor R7, and the detection pin of the singlechip subcircuit detects an invalid level (low-level signal), so that the DALI dimming power supply is judged to be in an open circuit state. As long as the maximum dimming signal duty cycle is set to <100%, the operating state of the DALI dimming power supply can be detected regardless of the duty cycle of the DALI dimming power supply dimming and the current of the loop and whether the load is off. When the DALI dimming power supply enters standby, the singlechip subcircuit outputs an invalid level (low-level signal), the first NMOS tube Q1 is closed, and the lamp is turned off. However, the voltage on the dimming terminal LED-1 passes through the photocoupler U2, the sixth resistor R6 and the seventh resistor R7 to the ground GNS, the lamp forms a loop, the lamp is slightly bright, an afterglow phenomenon is formed, and the brightness is particularly obvious at night. When the DALI dimming power supply enters standby, the singlechip subcircuit outputs an invalid level to the LED dimming subcircuit so as to turn off the lamp. Meanwhile, the singlechip sub-circuit outputs an invalid level to the control sub-circuit so as to close the loop current flowing through the control sub-circuit by the lamp, thereby eliminating the afterglow of the lamp.
Example 3:
as shown in fig. 3, this embodiment is a further improvement of embodiment 2, and the working principle of embodiment 2 is the same as that of this embodiment, except that embodiment 2 is a single-output DALI dimming power supply, and this embodiment is a two-output DALI dimming power supply, so that the working principle of this embodiment will not be described repeatedly. The present embodiment may further add a multiplexed DALI dimming power supply, but the working principle is the same, so the description of the multiplexed embodiment will not be repeated.
Example 4:
as shown in fig. 4, this embodiment further provides a DALI dimming power supply load detection method for eliminating LED afterglow, which is applied to the DALI dimming power supply load detection circuit and method, and the method includes:
step 100: outputting a level with a preset duty ratio to the LED dimming sub-circuit by utilizing the singlechip sub-circuit so as to lighten the lamp and simultaneously outputting an effective level to the control sub-circuit;
step 200: outputting the level on the negative electrode of the lamp to a load detection sub-circuit by using a control sub-circuit;
step 300: detecting a load detection sub-circuit by utilizing a singlechip sub-circuit, and judging that the DALI dimming power supply is connected with a load to work when a signal jump occurs in a detection result;
step 400: when the lamp is disconnected, the load detection subcircuit is detected by the singlechip subcircuit, and when the detection result is an invalid level, the DALI dimming power supply is judged to be in an open circuit state;
step 500: when the DALI dimming power supply enters standby, the singlechip subcircuit outputs an invalid level to the LED dimming subcircuit so as to turn off the lamp; meanwhile, the singlechip sub-circuit outputs an invalid level to the control sub-circuit so as to close the loop current flowing through the control sub-circuit by the lamp, thereby eliminating the afterglow of the lamp.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the method disclosed in the embodiment, since it corresponds to the circuit disclosed in the embodiment, the description is relatively simple, and the relevant points are referred to the circuit part description.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present application and the core ideas thereof; also, it is within the scope of the present application to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the application.
Claims (8)
1. A DALI dimming power supply load detection circuit, comprising:
the LED dimming circuit comprises a power supply sub-circuit, an LED dimming sub-circuit, a singlechip sub-circuit, a control sub-circuit and a load detection sub-circuit; the singlechip sub-circuit is respectively connected with the LED dimming sub-circuit, the control sub-circuit and the load detection sub-circuit; one end of the LED dimming sub-circuit is also connected with the power supply sub-circuit, and the other end of the LED dimming sub-circuit is also connected with the control sub-circuit and the negative electrode of the lamp; the control sub-circuit is also connected with the load detection sub-circuit; the power supply subcircuit is also connected with the positive electrode of the lamp;
the singlechip sub-circuit is used for outputting the level of a preset duty ratio to the LED dimming sub-circuit so as to lighten the lamp, and simultaneously outputting the effective level to the control sub-circuit, and the control sub-circuit is used for outputting the level on the cathode of the lamp to the load detection sub-circuit; the value of the preset duty cycle is less than 100%; the singlechip subcircuit is also used for detecting the load detection subcircuit, and when a signal jump occurs in a detection result, the DALI dimming power supply is judged to be connected with a load to work; when the lamp is disconnected, the singlechip subcircuit is also used for detecting the load detection subcircuit, and when the detection result is an invalid level, the DALI dimming power supply is judged to be in an open circuit state; when the DALI dimming power supply enters standby, the singlechip subcircuit outputs an invalid level to the LED dimming subcircuit so as to turn off the lamp; meanwhile, the singlechip sub-circuit outputs an invalid level to the control sub-circuit so as to close the loop current flowing through the control sub-circuit by the lamp, thereby eliminating the afterglow of the lamp.
2. The DALI dimming power supply load detection circuit according to claim 1, wherein the duty ratio of the level on the negative electrode of the lamp is calculated by the formula D 2 ＝1-D 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein D is 2 A duty ratio value D of the level on the negative electrode 1 Is a percentage value of the preset duty cycle.
3. The DALI dimming power supply load detection circuit of claim 1, wherein the power supply subcircuit is further connected to a hot, neutral, ground and supply voltage, respectively, of mains.
4. The DALI dimming power supply load detection circuit of claim 1, wherein the LED dimming sub-circuit comprises: the first NMOS tube, the first resistor and the second resistor;
the drain electrode of the first NMOS tube is respectively connected with the negative electrode of the lamp and the control sub-circuit; the grid electrode of the first NMOS tube is respectively connected with one end of the first resistor and one end of the second resistor; the other end of the first resistor is connected with the source electrode of the first NMOS tube and the power supply subcircuit respectively; the other end of the second resistor is connected with the singlechip sub-circuit.
5. The DALI dimming power supply load detection circuit of claim 1, wherein the control sub-circuit comprises: a photo coupler and a fifth resistor;
the fifth resistor is respectively connected with the first end of the photoelectric coupler and the singlechip sub-circuit; the second end of the photoelectric coupler is connected with a ground wire; the third end of the photoelectric coupler is connected with the load detection subcircuit; and the fourth end of the photoelectric coupler is respectively connected with the negative electrode of the lamp and the LED dimming sub-circuit.
6. The DALI dimming power supply load detection circuit of claim 1, wherein the load detection subcircuit comprises a first diode, a sixth resistor, and a seventh resistor;
the cathode of the first diode is respectively connected with one end of the sixth resistor and the control sub-circuit; the anode of the first diode is respectively connected with the other end of the sixth resistor and the singlechip sub-circuit; the other end of the sixth resistor is also connected with one end of the seventh resistor; the other end of the seventh resistor is also connected with a ground wire.
7. The DALI dimming power supply load detection circuit of claim 1, wherein the number of LED dimming subcircuits, control subcircuits, and load detection subcircuits is determined by the number of cathodes of the light fixture.
8. A DALI dimming power supply load detection method for eliminating LED afterglow, applied to a DALI dimming power supply load detection circuit according to any one of claims 1 to 7, the method comprising:
outputting a level with a preset duty ratio to the LED dimming sub-circuit by utilizing the singlechip sub-circuit so as to lighten the lamp and simultaneously outputting an effective level to the control sub-circuit;
outputting the level on the negative electrode of the lamp to a load detection sub-circuit by using a control sub-circuit;
detecting a load detection sub-circuit by utilizing a singlechip sub-circuit, and judging that the DALI dimming power supply is connected with a load to work when a signal jump occurs in a detection result;
when the lamp is disconnected, the load detection subcircuit is detected by the singlechip subcircuit, and when the detection result is an invalid level, the DALI dimming power supply is judged to be in an open circuit state;
when the DALI dimming power supply enters standby, an invalid level is output to the control sub-circuit by utilizing the single chip microcomputer sub-circuit so as to close the loop current of the lamp, and afterglow is eliminated.
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| CN114423117A (en) * | 2021-12-16 | 2022-04-29 | 广州裕芯电子科技有限公司 | LED brightness subsection control circuit and LED brightness subsection control method |
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| CN116209119A (en) | 2023-06-02 |
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