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CN119497273A - Lamp dimming control system and method for automatically determining dimming range of lamp - Google Patents

Lamp dimming control system and method for automatically determining dimming range of lamp Download PDF

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Publication number
CN119497273A
CN119497273A CN202311032239.2A CN202311032239A CN119497273A CN 119497273 A CN119497273 A CN 119497273A CN 202311032239 A CN202311032239 A CN 202311032239A CN 119497273 A CN119497273 A CN 119497273A
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China
Prior art keywords
dimming
control unit
light emitting
time
driving
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CN202311032239.2A
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Chinese (zh)
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林国尊
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Individual
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Individual
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Priority to CN202311032239.2A priority Critical patent/CN119497273A/en
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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
    • 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
    • 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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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

A dimming control system for lamp and a method for automatically judging dimming range of lamp are disclosed, which comprises (A) gradually decreasing the cycle average voltage of the driving signal output to the luminous element during the dimming detection period. (B) And recording critical dimming information when the current of the light emitting part corresponds to the starting flickering or closing of the light emitting part in the dimming detection period. (C) And according to the critical dimming information, the dimming range is shortened to obtain dimming lower limit information corresponding to the condition before the luminous element starts to flash or turns off. (D) And outputting the driving signal which is not lower than the dimming range corresponding to the dimming lower limit information during the normal operation. Therefore, the dimming lower limit information of each luminous piece can be automatically detected, the condition that the luminous piece flashes or extinguishes in the dimming process can be avoided, and the maximum dimming range of each luminous piece can be fully utilized.

Description

Lamp dimming control system and method for automatically judging dimming range of lamp
Technical Field
The present invention relates to a control system and a method for automatically determining a dimming range, and more particularly, to a dimming control system for a lamp and a method for automatically determining a dimming range for a lamp.
Background
In recent years, light Emitting Diodes (LEDs) have become the mainstream of ceiling fan lighting systems because of their advantages of power saving and long life. Referring to fig. 1, a current dimming method applied to an LED lamp mainly uses a TRIAC (not shown) to supply power, and changes the waveform of an output voltage 11 provided to the LED lamp by controlling the on time t of the TRIAC, so as to achieve the effect of brightness modulation of the LED lamp. In practice, for convenience of management, a fixed dimming range (for example, 4ms to 8.3ms corresponding to the on time t) is directly set in the system, so as to provide a user with dimming in the range. However, since the dimming ranges of the LED lamps of the manufacturers are different, when the lower limit of the dimming range set by the system is lower than the lower limit of the dimming range of the installed LED lamp, the LED lamp will flash or be directly turned off when the LED lamp is not receiving enough voltage in the process of dimming the LED lamp, and when the lower limit of the dimming range set by the system is higher than the lower limit of the dimming range of the installed LED lamp, the LED lamp cannot be continuously dimmed again.
Disclosure of Invention
The invention aims to provide a lamp dimming control system capable of automatically judging an appropriate dimming range according to various LED lamps.
The lamp dimming control system comprises a light emitting part, a driving circuit, a current detection circuit and a control unit.
The driving circuit is electrically connected with the light emitting piece and is used for outputting a driving signal to drive the light emitting piece to emit light.
The current detection circuit is electrically connected with the light emitting element, detects the current of the light emitting element and outputs a current signal.
The control unit is electrically connected with the driving circuit and the current detection circuit, receives the current signal and controls the driving circuit to operate, during the dimming detection period, the control unit controls the driving circuit to gradually decrease the period average voltage of the driving signal so as to adjust the light of the light emitting part to change from bright to dark, when the current signal corresponds to the light emitting part to start to flash or close, critical dimming information at the moment is recorded, the control unit reduces the dimming range according to the critical dimming information to obtain dimming lower limit information corresponding to the light emitting part before starting to flash or close, and during the normal operation period, the control unit controls the driving circuit to output the driving signal which is not lower than the dimming range corresponding to the dimming lower limit information.
In the dimming control system of the lamp of the invention, the driving circuit comprises a driving switch which is controlled by the control unit to output the driving signal, the control unit controls the on time of the driving switch to enable the driving signal to start to be output after the on time after the zero point and to end when the driving signal continues to the next zero point, and the control unit controls the driving switch to enable the on time to be gradually delayed during the dimming detection period so as to enable the period average voltage of the driving signal to be gradually reduced.
In the lamp dimming control system of the invention, the critical dimming information is related to the on time of the driving switch or the on time.
In the lamp dimming control system of the present invention, during the dimming detection period, the control unit records the on time when the light emitting element starts to flash or turns off as the critical dimming information, subtracts an adjustment value from the recorded on time as the dimming lower limit information, and uses a period corresponding to the calculated on time as an available dimming range, and during the normal operation period, the control unit controls the driving circuit to output the driving signal corresponding to the available dimming range.
According to the lamp dimming control system, when the current corresponding to the current signal is lower than a low current value, the control unit judges that the light emitting piece is turned off, and when the current corresponding to the current signal starts to oscillate up and down, the control unit judges that the light emitting piece starts to flash.
The invention aims to provide a method for automatically judging a dimming range of a lamp, which can automatically judge a proper dimming range according to various LED lamps.
The invention discloses a method for automatically judging a dimming range of a lamp, which is applied to a lamp dimming control system, wherein the lamp dimming control system comprises a control unit, a driving circuit and a luminous piece, the control unit is used for controlling the driving circuit to output a driving signal so as to enable the luminous piece to emit light, and the method for automatically judging the dimming range of the lamp comprises the following steps:
(A) In the dimming detection period, the control unit controls the driving circuit to gradually decrease the period average voltage of the driving signal so as to adjust the light of the light emitting piece to change from bright to dark.
(B) And during the dimming detection period, the control unit detects the current of the light emitting piece, and records the critical dimming information at the moment when the current of the light emitting piece corresponds to the starting flickering or closing of the light emitting piece.
(C) The control unit reduces the dimming range according to the critical dimming information to obtain dimming lower limit information corresponding to the condition before the luminous piece starts to flash or turns off.
(D) During normal operation, the control unit controls the driving circuit to output the driving signal which is not lower than the dimming range corresponding to the dimming lower limit information.
In the method for automatically determining the dimming range of the lamp, the driving circuit comprises a driving switch controlled by the control unit to output the driving signal, the control unit controls the on time of the driving switch to enable the driving signal to start to be output after the on time after the zero point and to end when the driving signal continues to the next zero point, and in the step (A), the control unit controls the on time of the driving switch to enable the on time to be gradually delayed so as to enable the period average voltage of the driving signal to be gradually reduced.
According to the method for automatically judging the dimming range of the lamp, the critical dimming information is related to the on time of the driving switch or the on time.
In the method for automatically determining a dimming range of a lamp of the present invention, in the step (B), the control unit records the on time when the light emitting element starts to flash or turns off as the critical dimming information, in the step (C), the control unit subtracts an adjustment value from the recorded on time as the dimming lower limit information, and then uses a period corresponding to the calculated on time as an available dimming range, and in the step (D), the control unit controls the driving circuit to output the driving signal corresponding to the available dimming range.
In the method for automatically determining the dimming range of the lamp, in the step (B), the control unit determines that the light emitting piece is turned off when the current corresponding to the current signal is lower than a low current value, and determines that the light emitting piece starts to flicker when the current corresponding to the current signal starts to vibrate up and down.
The invention has the beneficial effects that the driving circuit and the current detection circuit are arranged, the control unit is matched in the dimming detection period, the cycle average voltage of the driving signal is controlled to gradually drop, the dimming lower limit information is obtained according to the critical dimming information when the luminous element starts to flash or is closed, and the driving signal is output in the normal operation period according to the dimming lower limit information.
Drawings
Fig. 1 is a schematic diagram illustrating waveforms of an output voltage for brightness modulation of an LED lamp in the prior art;
FIG. 2 is a block diagram of a lamp dimming control system according to an embodiment of the present invention;
Fig. 3 is a schematic waveform diagram of a driving signal for dimming a light emitting member according to the embodiment, and fig. 4 is a flowchart of an embodiment of a method for automatically determining a dimming range of a lamp according to the present invention.
Detailed Description
Referring to fig. 2, an embodiment of the dimming control system for a lamp of the present invention includes a light emitting device 3, a driving circuit 4, a current detecting circuit 5, and a control unit 7. The luminaire dimming control system optionally further comprises a power supply circuit 2 and a communication unit 6 for communicating with a remote control 9.
The power supply circuit 2 is configured to receive an external power source (e.g., a mains supply), and to supply the external power source with voltage and voltage, and then to the driving circuit 4, the current detecting circuit 5, and the control unit 7.
The light emitting member 3 is a Light Emitting Diode (LED), and receives a driving signal to emit light.
The driving circuit 4 is electrically connected to the light emitting element 3, and receives the control of the control unit 7 to output the driving signal. The driving circuit 4 includes a driving switch 41 controlled by the control unit 7 to output the driving signal, where the driving switch 41 is, for example, a TRIAC, and is controlled by the control unit 7 to be conductive or non-conductive, so as to adjust a conductive angle of the driving signal, thereby changing the brightness of the light emitting element 3. The drive signal outputs a power supply when the drive switch 41 is turned on, and the drive signal does not output a power supply when the drive switch 41 is turned off. Referring to fig. 2 and 3, the driving switch 41 is controlled by the control unit 7 to turn on the driving signal to start outputting after an on time p 1,p2,pn,pn+1 after the zero point, and to end when the driving signal continues to the next zero point. Since the extended details of the driving circuit 4 can be deduced by a person skilled in the art from the above description, no description will be given.
The current detection circuit 5 is electrically connected with the light emitting element 3, detects the current of the light emitting element 3 and outputs a current signal.
The communication unit 6 is electrically connected to the control unit 7, so that the control unit 7 and the remote controller 9 can communicate with each other, and a user can control the operation of the lamp by operating the remote controller 9, for example, the user can execute a process of a method for automatically determining the dimming range of the lamp by operating the remote controller 9 (for example, pressing a specific key for a predetermined time (for example, 30 seconds or 60 seconds) when the user is powered on). The remote controller 9 may be a general hand-held remote controller, and may communicate with the communication unit 6 using a short-distance wireless communication technology such as Bluetooth (Bluetooth), infrared, wi-Fi, etc., or the remote controller 9 may be a wall-controlled switch, and may be connected with the communication unit 6 by a wire.
The control unit 7 is electrically connected to the power circuit 2, the driving circuit 4 and the current detecting circuit 5, receives the current signal and controls the driving circuit 4 to operate. During a dimming detection period, the control unit 7 controls the driving circuit 4 to gradually decrease the period average voltage of the driving signal, so as to adjust the light of the light emitting element 3 to change from bright to dark, and records a critical dimming information when the current signal corresponds to the light emitting element 3 to start to flash or turn off, and the control unit 7 reduces the dimming range according to the critical dimming information to obtain a dimming lower limit information corresponding to the light emitting element 3 before starting to flash or turn off. The control unit 7 stores the dimming lower limit information, and controls the driving circuit 4 to output the driving signal not lower than the dimming range corresponding to the dimming lower limit information during a normal operation period. The control unit 7 can be designed as a circuit with functions of operation, storage, etc., which can be implemented, for example, using a microcontroller (Microcontroller, abbreviated MCU).
The practical application situation is described as follows:
When the user wants to perform the function of automatically determining the dimming range, the remote control 9 can be operated to control the control unit 7 via the communication unit 6. For example, the automatic dimming detection function may be activated by pressing a specific key within 30 seconds of power-up, or may be configured to perform the automatic dimming detection function together when the remote controller 9 is paired with a lamp, or may be configured to automatically execute the automatic dimming detection programming each time the lamp dimming control system is powered up, and store the obtained usable dimming range for use during the normal operation.
During the dimming detection period, the control unit 7 controls the driving circuit 4 to gradually decrease the period average voltage of the driving signal, for example, in such a manner that the control unit 7 controls the time point p 1、p2、…pn、pn+1 (i.e., the on time) at which the driving switch 41 starts to be turned on to gradually delay, so that the driving signal has the on time t 1、t2、…tn、tn+1 gradually decreases as shown in fig. 3, and thus the period average voltage of the driving signal gradually decreases, and the brightness of the light emitting element 3 gradually turns dark.
The on-time p 1、p2、…pn、pn+1 may be gradually delayed by a fixed time interval Δt (i.e., the on-time t 1、t2、…tn、tn+1 is gradually reduced by the fixed time interval Δt), or may be gradually delayed by a larger time interval Δt 1 according to a predetermined setting, and then be gradually delayed by a smaller time interval Δt 2.
The initial on time may be set to a predetermined time p 1 as shown in fig. 3, or set to 0 (i.e., the output power is started after zero). The predetermined time p 1 may be set according to the actual requirement, for example, may be set to start the dimming detection from about the middle value of the general tunable range (or 1/3 or 1/4 of the general tunable range). In the description of the drive signal of 60Hz, the typical adjustable range is 0 to 8.3ms (0 to 10ms when the drive signal is 50 Hz), so that the dimming detection can be set to be started from 4.15ms (i.e., the intermediate value) or 2.77ms (i.e., about 1/3) or 2.08ms (i.e., about 1/4) after the zero crossing, and thus the time for the dimming detection can be reduced.
During the dimming detection period, when the on time of the driving switch 41 gradually decreases, the power supplied by the driving signal is lower than the power required by the light emitting device 3 for normal operation (for example, when the voltage is too low), the light emitting device 3 will start to flash or turn off (dim). The control unit 7 detects the current of the light emitting element 3 through the current detection circuit 5 to determine a point in time when the current of the light emitting element 3 corresponds to blinking or turning off. For example, when the light emitting element 3 is operating normally, the current will gradually decrease along with the decrease of the power supply provided by the driving signal, when the current corresponding to the current signal decreases to a value lower than a low current value (for example, a value approaching to 0), that is, the current representing the light emitting element 3 is 0, the control unit 7 determines that the light emitting element 3 is turned off, and when the current corresponding to the current signal begins to oscillate up and down, the light emitting element 3 is determined to begin to flash.
When the current of the light emitting element 3 corresponds to blinking or turning off, the control unit 7 records the on-time (or records the on-time) as the critical dimming information. Then, the control unit 7 pushes the recorded on-time forward by an adjustment value, so as to obtain a safe dimmable lower limit value (i.e. the dimming lower limit information) of the on-time, and then uses a period corresponding to the dimmable lower limit value of the on-time as the usable dimming range.
The adjustment value may be a preset value (e.g., 0.1ms, 0.2ms, 0.5ms, 1 ms.) or a time interval Δt between the recorded on-time and the previous on-time or a time interval Δt between the recorded on-time and the previous several (e.g., the first two, the first three, or the first four).
For example, if the light emitting device 3 starts to flash when the on time decreases to t n+1 in fig. 3, the control unit 7 records the on time p n+1 (or records the on time t n+1), subtracts the adjustment value from the recorded on time p n+1 to obtain the usable dimming range (for example, assuming that the recorded on time p n+1 is 4.5ms and the preset adjustment value is 0.2ms, the usable dimming range is 0 to 4.3ms, that is, a period from zero point to 4.3ms, or subtracts the last time interval Δt from the recorded on time p n+1 to obtain the on time p n (that is, the on time p n corresponding to a period returned to the on time t n), and takes a period corresponding to the previous on time p n as the usable dimming range (for example, assuming that the recorded on time p is 28.5 ms, that the previous on time p is 4.4ms, that is 0.4 ms, that is a period from zero point to zero point is 0.4 ms, that is a period from zero point to 4.4ms, that is a period from zero point to 0.4 ms, that is a period from zero point to 4.4 ms).
Then, during the normal operation of the lamp, the control unit 7 controls the driving circuit 4 to output the driving signal corresponding to the usable dimming range according to the obtained usable dimming range, that is, the user can only perform the dimming operation in the usable dimming range. Therefore, the condition that the lamp flashes or is extinguished in the dimming process of a user can be avoided, and the dimming range of each luminous piece 3 can be fully utilized.
Referring to fig. 2 and 4, an embodiment of a method for automatically determining a dimming range of a lamp according to the present invention is applied to the above-mentioned dimming control system of a lamp, and the method for automatically determining a dimming range of a lamp includes the following steps:
In step S01, during a dimming detection period, the control unit 7 controls the driving circuit 4 to gradually decrease the period average voltage of the driving signal, so as to adjust the light of the light emitting element 3 from bright to dark.
In step S01, the control unit 7 controls the on-time of the driving switch 41 to gradually decrease so that the period average voltage of the driving signal gradually decreases.
In step S01, the control unit 7 controls the on-time of the driving switch 41 to gradually delay the on-time, so that the period average voltage of the driving signal gradually decreases.
In step S02, during the dimming detection period, the control unit 7 detects the current of the light emitting element 3, and records a critical dimming message when the current of the light emitting element 3 corresponds to the start of the flashing or the shutdown of the light emitting element 3.
In step S02, the critical dimming information is related to the on time of the driving switch 41 or the off time.
In step S02, the control unit 7 records the on time when the light emitting element 3 starts to flash or turns off as the critical dimming information.
In step S02, the control unit 7 determines that the light emitting element 3 is turned off when the current corresponding to the current signal is lower than a low current value, and determines that the light emitting element 3 starts to flash when the current corresponding to the current signal starts to oscillate up and down.
In step S03, the control unit 7 shortens the dimming range according to the critical dimming information to obtain a dimming lower limit information corresponding to the lighting fixture 3 before starting to flash or turning off.
In step S03, the control unit 7 subtracts an adjustment value from the recorded on-time to obtain the dimming lower limit information, and uses a period corresponding to the calculated on-time as an available dimming range.
In step S04, during a normal operation period, the control unit 7 controls the driving circuit 4 to output the driving signal not lower than the dimming range corresponding to the dimming lower limit information.
In step S04, the control unit 7 controls the driving circuit 4 to output the driving signal corresponding to the usable dimming range.
From the above description, the effects of the present embodiment are as follows:
The driving circuit 4 and the current detecting circuit 5 are arranged, and the control unit 7 is matched to control the cycle average voltage of the driving signal to gradually drop in the dimming detection period, the dimming lower limit information is obtained according to the critical dimming information that the luminous elements 3 start to flash or turn off, and then the control unit 7 is enabled to control the driving circuit 4 to output the driving signal which is not lower than the dimming range corresponding to the dimming lower limit information in the normal operation period, so that the dimming lower limit information of each luminous element 3 can be automatically detected for use in the normal operation period, the situation that the luminous elements 3 flash or turn off in the dimming process can be avoided, and the maximum dimming range of each luminous element 3 can be fully utilized.
In summary, the light dimming control system and the method for automatically determining the dimming range of the lamp can achieve the purpose of the invention.
The foregoing is merely illustrative of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims and their equivalents.

Claims (10)

1. A lamp dimming control system comprises a light emitting part, a driving circuit, a current detection circuit and a control unit, and is characterized in that:
The driving circuit is electrically connected with the light-emitting piece and is used for outputting a driving signal to drive the light-emitting piece to emit light;
The current detection circuit is electrically connected with the light emitting element, detects the current of the light emitting element and outputs a current signal;
The control unit is electrically connected with the driving circuit and the current detection circuit, receives the current signal and controls the driving circuit to operate, during the dimming detection period, the control unit controls the driving circuit to gradually decrease the period average voltage of the driving signal so as to adjust the light of the light emitting part to change from bright to dark, when the current signal corresponds to the light emitting part to start to flash or close, critical dimming information at the moment is recorded, the control unit reduces the dimming range according to the critical dimming information to obtain dimming lower limit information corresponding to the light emitting part before starting to flash or close, and during the normal operation period, the control unit controls the driving circuit to output the driving signal which is not lower than the dimming range corresponding to the dimming lower limit information.
2. The light modulation control system according to claim 1, wherein the driving circuit comprises a driving switch controlled by the control unit to output the driving signal, the control unit controls the on time of the driving switch to start outputting the driving signal after an on time after a zero point and to end when the driving signal continues to the next zero point, and the control unit controls the driving switch to gradually delay the on time during the light modulation detection period to gradually decrease the periodic average voltage of the driving signal.
3. The lamp dimming control system as claimed in claim 2, wherein the critical dimming information is related to an on time of the driving switch or related to the on time.
4. The light modulation control system according to claim 2, wherein during the light modulation detection period, the control unit records the on-time when the light emitting element starts to flash or turns off as the critical light modulation information, subtracts an adjustment value from the recorded on-time as the light modulation lower limit information, and uses a period corresponding to the calculated on-time as an available light modulation range, and during the normal operation period, the control unit controls the driving circuit to output the driving signal corresponding to the available light modulation range.
5. The light modulation control system of claim 1, wherein the control unit determines that the light emitting element is turned off when the current corresponding to the current signal is lower than a low current value, and determines that the light emitting element starts to flash when the current corresponding to the current signal starts to oscillate up and down.
6. The method for automatically judging the dimming range of the lamp is applied to a lamp dimming control system, the lamp dimming control system comprises a control unit, a driving circuit and a luminous piece, wherein the control unit is used for controlling the driving circuit to output a driving signal to enable the luminous piece to emit light, and the method is characterized by comprising the following steps of:
(A) During the dimming detection period, the control unit controls the driving circuit to gradually decrease the period average voltage of the driving signal so as to adjust the light of the light emitting piece to change from bright to dark;
(B) During the dimming detection period, the control unit detects the current of the light emitting part, and records critical dimming information at the moment when the current of the light emitting part corresponds to the starting flickering or closing of the light emitting part;
(C) The control unit reduces the dimming range according to the critical dimming information to obtain the dimming lower limit information corresponding to the luminous element before starting to flash or closing, and
(D) During normal operation, the control unit controls the driving circuit to output the driving signal which is not lower than the dimming range corresponding to the dimming lower limit information.
7. The method of automatically determining a dimming range of a lamp according to claim 6, wherein the driving circuit comprises a driving switch controlled by the control unit to output the driving signal, the control unit controls the on-time of the driving switch to start outputting the driving signal after an on-time after a zero point and to end when the driving signal continues to a next zero point, and in step (A), the control unit controls the on-time of the driving switch to gradually delay the on-time to gradually decrease a cycle average voltage of the driving signal.
8. The method of claim 7, wherein the critical dimming information is related to an on time of the driving switch or related to the on time.
9. The method of claim 7, wherein in step (B), the control unit records the on-time when the light emitting element starts to flash or turns off as the critical dimming information, in step (C), the control unit subtracts an adjustment value from the recorded on-time as the dimming lower limit information, and in step (D), the control unit controls the driving circuit to output the driving signal corresponding to the usable dimming range with a period corresponding to the calculated on-time as the usable dimming range.
10. The method of claim 6, wherein in the step (B), the control unit determines that the light emitting element is turned off when the current corresponding to the current signal is lower than a low current value, and determines that the light emitting element starts to flash when the current corresponding to the current signal starts to oscillate up and down.
CN202311032239.2A 2023-08-16 2023-08-16 Lamp dimming control system and method for automatically determining dimming range of lamp Pending CN119497273A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311032239.2A CN119497273A (en) 2023-08-16 2023-08-16 Lamp dimming control system and method for automatically determining dimming range of lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311032239.2A CN119497273A (en) 2023-08-16 2023-08-16 Lamp dimming control system and method for automatically determining dimming range of lamp

Publications (1)

Publication Number Publication Date
CN119497273A true CN119497273A (en) 2025-02-21

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CN202311032239.2A Pending CN119497273A (en) 2023-08-16 2023-08-16 Lamp dimming control system and method for automatically determining dimming range of lamp

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