A multi-dimming mode to phase-cut dimming controller and control method thereof

Abstract

The present invention discloses a multi-dimming mode to phase-cut dimming controller and a control method thereof. The controller comprises an MCU main control module, a zero-crossing detection module, an output chopping module, a dial module, a fine-tuning module, an NFC module and at least two different dimming signal input modules. The structure can automatically adapt to alternating current signals of different frequencies and voltages, and the minimum phase-cut time and the phase-cut mode meet the mechanical adjustment of the controller itself and can be configured using NFC, which is more convenient and quick. Not only are multiple dimming modes integrated, but each dimming mode can correctly adjust the output phase-cut time, so that users have more choices.

Description

Technical Field

[0001] The present invention relates to the technical field of lamp equipment, and in particular to a multi-dimming mode to phase-cut dimming controller and a control method thereof. Background Art

[0002] Phase-cut dimming technology is widely used in the transformation of existing lighting lines in old buildings into lighting solutions with dimming functions. It has the advantages of simple transformation and convenient installation and wiring for users. With the popularity of intelligent lighting control, DALI and DMX512 digital dimming control methods are becoming more and more widely used. At the same time, dimming methods such as 0-10V and PUSH are also widely used in simple application scenarios. In some application scenarios, sometimes it is encountered that dimming lines can no longer be arranged in the laid lines, but lighting control is achieved through dimming methods such as DALI, DMX512, 0-10V or PUSH. At this time, a phase-cut dimming signal converter is needed to achieve dimming control.

[0003] The current phase-cut dimming signal converters are all single signal converters, and are unable to convert multiple dimming signal inputs into phase-cut dimming signal converters. In addition, there is only one phase-cutting mode, either leading edge phase-cutting or trailing edge phase-cutting, which is very inconvenient when used. Therefore, there is an urgent need for a multi-dimming mode to phase-cut dimming controller and a control method thereof to solve the above problems. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a multi-dimming mode to phase-cut dimming controller and a control method thereof.

[0005] The technical solution adopted by an embodiment of the present invention to solve the technical problem is: a multi-dimming mode to phase-cut dimming controller, including an MCU main control module, a zero-crossing detection module, an output chopping module, a dial module, a fine-tuning module, an NFC module and at least two different dimming signal input modules;

[0006] The zero-crossing detection module is connected between the input AC power supply, the MCU main control module and the output chopper module, and is used to detect the zero-crossing point of the input AC power supply;

[0007] The dial module is connected to the MCU main control module to configure the phase cutting direction;

[0008] The fine-tuning module is connected to the MCU main control module to configure the minimum phase-cutting time;

[0009] The NFC module is connected to the MCU main control module to configure the phase-cutting direction and phase-cutting time;

[0010] The input end of the dimming signal input module is connected to different dimming signals, and the output end is connected to the MCU main control module to provide dimming signals;

[0011] The output chopping module is connected between the AC power supply, the MCU main control module and the LED lamp, and is used to perform chopping dimming on the LED lamp.

[0012] As one of the preferred embodiments of the present invention, the dimming signal input module is configured as a DALI-PUSH module, a 0-10V dimming module and / or a DMX512 dimming module.

[0013] A control method, applied to a controller, comprises the following steps:

[0014] S1, obtaining the frequency and zero-crossing position of the input AC power supply through the zero-crossing detection module;

[0015] S2. Read the configurations of the dial module and the fine-tuning module and compare them with the configuration of the NFC module. If the configuration of the NFC module has changed, execute according to the phase-cut direction and minimum phase-cut time configured in the NFC module. If the configuration of the NFC module has not changed, execute according to the phase-cut direction configured in the dial module and the minimum phase-cut time configured in the fine-tuning module, and modify the configuration of the NFC module at the same time.

[0016] S3, reading and comparing the dimming values ​​of the dimming signal input modules, and calculating the output phase cutting time according to the dimming value of the dimming signal input module with the smallest dimming value;

[0017] S4, the MCU main control module outputs a phase-cut PWM signal to the LED lamp according to the phase-cut direction and phase-cut time and after the falling edge delay.

[0018] As one of the preferred embodiments of the present invention, in step S2, the following steps are also included:

[0019] After configuring the phase-cut direction through the NFC module and restarting the controller, if the configuration of the DIP module has not changed, the phase-cut direction output by the controller is the phase-cut direction configured by the NFC module; if the NFC module is configured with a phase-cut direction before power-on and the DIP module changes the phase-cut direction, the phase-cut direction output by the controller after power-on is the phase-cut direction configured by the DIP module; if the configuration of the DIP module changes after power-on, the phase-cut mode output by the controller after the next power-on is the phase-cut direction configured by the DIP module.

[0020] As one of the preferred embodiments of the present invention, in step S2, the following steps are also included:

[0021] After configuring the minimum phase-cutting time through the NFC module and restarting the controller, if the configuration of the fine-tuning module has not changed, the minimum phase-cutting time output by the controller is the minimum phase-cutting time configured by the NFC module; if the configuration of the fine-tuning module has changed during power-on, the minimum phase-cutting time output by the controller after power-on is the minimum phase-cutting time configured by the fine-tuning module; if the configuration of the fine-tuning module has changed after power-on, the minimum phase-cutting time output by the controller will change accordingly.

[0022] As one of the preferred embodiments of the present invention, in step S3, the following steps are also included:

[0023] When the dimming signal input module is not connected, the controller is configured for maximum output chopping time;

[0024] When a dimming signal input module is connected, the controller is configured such that when adjusting from maximum to minimum, the output chopping time changes from the maximum output chopping time to the minimum output chopping time until the output is turned off, and the output chopping time changes in real time with the dimming signal input module;

[0025] When at least two dimming signal input modules are connected, when any one of the dimming signal input modules is adjusted, if there is another dimming signal input module whose dimming value is smaller than the dimming value of the current dimming signal input module, the output chopping time of the controller does not change when the dimming signal input module is adjusted until the dimming signal input module is adjusted to a dimming value smaller than that of all other connected dimming signal input modules, and the output chopping time of the controller decreases following the current dimming signal input module.

[0026] As one of the preferred embodiments of the present invention, in step S4, the following steps are also included:

[0027] When the output is configured as trailing edge phase-cutting output and the dimming value is not zero and the zero-crossing position is detected, the MCU main control module controls the PWM output to be high level and sets the timing time to the output phase-cutting time converted from the dimming value. When the timing time is reached, the MCU main control module turns off the PWM output and waits for the next zero-crossing position to turn it on again.

[0028] When configured as leading-edge phase-cut output and the dimming value is not zero, and the zero-crossing position is detected, the MCU main control module controls the PWM output to a low level and sets the timing time to the output phase-cutting time calculated by subtracting the dimming value from the cycle time T. When the timing time is reached, the MCU main control module turns on the PWM output and waits for the next zero-crossing position to turn it off again.

[0029] The beneficial effects of the present invention include: a multi-dimming mode to phase-cut dimming controller and a control method thereof, wherein the controller comprises an MCU main control module, a zero-crossing detection module, an output chopping module, a dial module, a fine-tuning module, an NFC module and at least two different dimming signal input modules; the above structure can automatically adapt to AC signals of different frequencies and voltages, and the minimum phase-cutting time and the phase-cutting mode satisfy the mechanical adjustment of the controller itself and can be configured using NFC, which is more convenient and quick; not only a plurality of dimming modes are integrated, but each dimming mode can correctly adjust the output phase-cutting time, so that users have more choices. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 It is a principle block diagram of a multi-dimming mode to phase-cut dimming controller;

[0032] Figure 2 It is a flow chart of a control method for a multi-dimming mode to phase-cut dimming controller;

[0033] Figure 3 It is a schematic diagram of converting the input AC power into a square wave signal;

[0034] Figure 4 This is a schematic diagram of the trailing edge phase-cut output;

[0035] Figure 5 This is a schematic diagram of leading edge phase-cutting output. DETAILED DESCRIPTION

[0036] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0037] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the present invention, unless otherwise clearly defined, the words "configuration", "installation", "connection" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0040] ①Reference Figures 1 to 5 The present invention provides a multi-dimming mode to phase-cut dimming controller, comprising an MCU main control module 10, a zero-crossing detection module 20, an output chopping module 30, a dial module 40, a fine-tuning module 50, an NFC module 60 and at least two different dimming signal input modules 70; the zero-crossing detection module 20 is connected between the input AC power supply, the MCU main control module 10 and the output chopping module 30, and is used to detect the zero-crossing point of the input AC power supply; the dial module 40 is connected to the MCU main control module 10, and is used to configure the phase-cut direction; the fine-tuning module 50 is connected to the MCU main control module 10, and is used to configure the minimum phase-cut time; the NFC module 60 is connected to the MCU main control module 10, and is used to configure the phase-cut direction and the phase-cut time; the input end of the dimming signal input module 70 is connected to different dimming signals, and the output end is connected to the MCU main control module 10, and is used to provide a dimming signal; the output chopping module 30 is connected between the AC power supply, the MCU main control module 10 and the LED lamp, and is used to perform chopping dimming on the LED lamp.

[0041] In the present invention, the working principle is as follows:

[0042] 1) The output chopping module 30 includes a driving module and a field effect tube connected to the driving module. The MCU main control module 10 outputs a PWM signal which is input to the driving module. The driving module controls the switch of the field effect tube to realize the AC phase-cutting chopping function. By changing the high-level time of the PWM output by the MCU main control module 10, the opening time of the field effect tube can be changed, thereby controlling the AC phase-cutting chopping time.

[0043] 2) Use the zero-crossing detection module 20 to detect the AC voltage signal input by the controller and convert the AC voltage signal into a square wave signal; the MCU main control module 10 identifies the square wave signal through an external interrupt and uses a timer to parse the square wave signal. The specific parsing method is: when the MCU main control module 10 detects the first falling edge of the square wave, first clear the timer count and then reopen the timer count. When the rising edge of the square wave is detected, read the timer count, which is the low-level duration of the square wave; when the falling edge of the square wave is detected again, read the timer count time, which is the cycle time of the square wave. At this time, after reading the timer count, it needs to be cleared to enter the time count of the next cycle.

[0044] The cycle time of the square wave is the half cycle time of the input AC voltage signal. After reading the cycle time of the square wave, the frequency of the input AC voltage signal can be calculated, and the zero-crossing time of the input AC power can also be known. The voltage signal of the fine-tuning module 50 is transmitted to the MCU main control module 10 by using the ADC sampling conversion module. The MCU main control module 10 calculates the received voltage data. After the calculation is completed, the minimum time for the PWM output high-level phase cutting can be obtained. When the fine-tuning module 50 adjusts the voltage, the minimum time for the output phase cutting will change accordingly.

[0045] 3) The dial module 40 can switch the leading and trailing edges, and use the IO detection function of the MCU main control module 10 to detect the high and low levels of the dial switch. When the MCU main control module 10 detects that the dial voltage is at a high level, the MCU main control module 10 sets the PWM output phase cutting to the leading edge phase cutting output mode; when the MCU detects that the dial voltage is at a low level, the MCU main control module 10 sets the PWM output phase cutting to the trailing edge phase cutting output mode.

[0046] The data set by the NFC module 60 is transmitted to the MCU main control module 10 by using the I2C communication module. The MCU main control module 10 analyzes and processes the received data to obtain the minimum phase-cut time and the leading and trailing edge phase-cut output mode configured by the NFC module 60. When the leading and trailing edge phase-cut output mode set by the dial module 40 and the minimum phase-cut time set by the fine-tuning module 50 are inconsistent with the setting of the NFC module 60, the MCU main control module 10 will read the phase-cut output mode and the minimum phase-cut time saved before the last power-off. When the next power-on is detected, if the leading and trailing edge phase-cut output mode set by the NFC module 60 is changed and the setting of the dial module 40 is unchanged, then after power-on, the MCU main control module 10 will set the PWM phase-cut output mode according to the setting of the NFC module 60. If the setting of the dial module 40 changes, regardless of whether the setting of the NFC module 60 changes, the MCU main control module 10 will set the PWM phase-cut output mode according to the setting of the dial module 40, and will modify the phase-cut direction configuration of the NFC module 60. Similarly, the minimum phase-cut time setting is also the same.

[0047] The dimming signal input module 70 is configured as a DALI-PUSH dimming module 70a, a DMX512 dimming module 70b and / or a 0-10V dimming module 70c; the DMX512 dimming command is transmitted to the MCU main control module 10 through the serial port, the DALI-PUSH is recognized by the MCU main control module 10 through the external IO interrupt, and the 0-10V dimming is captured by the MCU main control module 10 by inputting a 1kHz duty cycle signal; the above-mentioned dimming signal is input into the MCU main control module 10 and then processed and calculated to obtain the dimming value of each dimming mode, and the MCU main control module 10 compares the dimming values ​​of various dimming modes, and outputs the dimming value according to the dimming mode with the smallest dimming value to calculate the PWM output high level time.

[0048] ② The present invention also provides a control method, which is applied to the controller, comprising the following steps: S1, obtaining the frequency and zero-crossing position of the input AC power supply through the zero-crossing detection module 20; S2, reading the configuration of the dial module 40 and the fine-tuning module 50 and comparing them with the configuration of the NFC module 60. If the configuration of the NFC module 60 changes, it is executed according to the phase-cutting direction and the minimum phase-cutting time configured by the NFC module 60. If the configuration of the NFC module 60 does not change, it is executed according to the phase-cutting direction configured by the dial module 40 and the minimum phase-cutting time configured by the fine-tuning module 50, and the configuration of the NFC module 60 is modified at the same time; S3, reading and comparing the dimming value of the dimming signal input module 70, and calculating the output phase-cutting time according to the dimming value of the dimming signal input module 70 with the smallest dimming value; S4, the MCU main control module 10 outputs a phase-cutting PWM signal to the LED lamp according to the phase-cutting direction and the phase-cutting time and after the falling edge delay.

[0049] In the present invention, the working principle is as follows:

[0050] 1) Reference Figure 1-Figure 3 , the input AC power is converted into a square wave signal after passing through the zero-crossing detection module 20, and the period of the square wave signal is half of the period of the input AC power. The square wave signal is transmitted to the MCU main control module 10, and the MCU main control module 10 analyzes the square wave signal to obtain the frequency of the input AC power and the zero-crossing position. The input frequency can be calculated by the inverse of the square wave period T. When the square wave signal period meets condition one, the input AC signal frequency is determined to be 50Hz, and when the square wave signal period meets condition two, the input AC signal frequency is determined to be 60Hz. The condition one is that the square wave signal period is between 9.5ms-11ms, and the condition two is that the square wave signal period is between 7.3ms-8.8ms; and the zero-crossing position is at the time point t1 after the falling edge of the square wave. After obtaining the input frequency and the zero-crossing position, it is convenient for the subsequent MCU main control module 10 to control the time point of PWM output chopping and the maximum output chopping time.

[0051] 2) In one embodiment, in step S2, the following steps are also included:

[0052] After configuring the phase-cut direction through the NFC module 60 and restarting the controller, if the configuration of the dial module 40 has not changed, the phase-cut direction output by the controller is the phase-cut direction configured by the NFC module 60; if the NFC module 60 is configured with a phase-cut direction before power-on and the dial module 40 changes the phase-cut direction, the phase-cut direction output by the controller after power-on is the phase-cut direction configured by the dial module 40; if the configuration of the dial module 40 changes after power-on, the phase-cut mode output by the controller after the next power-on is the phase-cut direction configured by the dial module 40.

[0053] 3) In one embodiment, in step S2, the following steps are also included:

[0054] After configuring the minimum phase-cut time through the NFC module 60 and restarting the controller, if the configuration of the fine-tuning module 50 has not changed, the minimum phase-cut time output by the controller is the minimum phase-cut time configured by the NFC module 60; if the configuration of the fine-tuning module 50 has changed when power is turned on, the minimum phase-cut time output by the controller after power-on is the minimum phase-cut time configured by the fine-tuning module 50; if the configuration of the fine-tuning module 50 has changed after power-on, the minimum phase-cut time output by the controller changes accordingly.

[0055] 4) In one embodiment, in step S3, the following steps are also included:

[0056] The controller has multiple dimming modes such as DALI-PUSH, DMX512, 0-10V, etc. When the dimming signal input module 70 is not connected, the controller is configured to have the maximum output chopping time; when one dimming signal input module 70 is connected, the controller is configured to have the output chopping time change from the maximum output chopping time to the minimum output chopping time until the output is turned off when adjusting from the maximum to the minimum, and the output chopping time changes in real time with the dimming signal input module 70; when at least two dimming signal input modules 70 are connected, any one of the dimming signal input modules 70 is adjusted. If there is another dimming signal input module 70 whose dimming value is smaller than the dimming value of the current dimming signal input module 70, when the dimming signal input module 70 is adjusted, the output chopping time of the controller does not change until the dimming signal input module 70 is adjusted to a dimming value smaller than that of all other dimming signal input modules 70 connected, and the output chopping time of the controller decreases with the current dimming signal input module 70.

[0057] 5) When the output chopping time, output chopping direction and zero-crossing position are determined, the MCU main control module 10 can control when the output PWM is turned on and off; refer to Figure 4 , when the controller is configured for trailing edge phase-cut output and the dimming value is not zero and the zero-crossing position is detected, the MCU main control module 10 controls the PWM output to be high level and sets the timing time to be the output phase-cutting time converted from the dimming value. When the timing time is reached, the MCU main control module 10 turns off the PWM output and waits for the next zero-crossing position to turn it on again; refer to Figure 5 When the controller is configured for leading-edge phase-cut output and the dimming value is not zero and the zero-crossing position is detected, the MCU main control module 10 controls the PWM output to be low level and sets the timing time to be the output phase-cutting time calculated by subtracting the dimming value from the cycle time T. When the timing time is reached, the MCU main control module 10 turns on the PWM output and waits for the next zero-crossing position to turn it off again. Regardless of the phase-cutting mode, when the dimmer is adjusted to change the dimming value, the corresponding output phase-cutting time will change accordingly, and then the waveform of the phase-cutting will change.

[0058] ③The advantages of the present invention are: through the above structure, it can automatically adapt to AC signals of different frequencies and voltages, and the minimum phase-cutting time and phase-cutting mode meet the mechanical adjustment of the controller itself and can be configured using NFC, which is more convenient and quick; not only multiple dimming modes are integrated, but each dimming mode can correctly adjust the output phase-cutting time, giving users more choices.

[0059] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A control method, applied to a multi-dimming mode to phase-cut dimming controller, characterized in that: The multi-dimming mode phase-cut dimming controller comprises an MCU main control module (10), a zero-crossing detection module (20), an output chopping module (30), a dial module (40), a fine-tuning module (50), an NFC module (60), and at least two different dimming signal input modules (70); The zero-crossing detection module (20) is connected between the input AC power supply, the MCU main control module (10) and the output chopping module (30), and is used to detect the zero-crossing point of the input AC power supply; The dial module (40) is connected to the MCU main control module (10) and is used to configure the phase cutting direction; The fine-tuning module (50) is connected to the MCU main control module (10) and is used to configure the minimum phase-cutting time; The NFC module (60) is connected to the MCU main control module (10) and is used to configure the phase cutting direction and phase cutting time; The input end of the dimming signal input module (70) is connected to different dimming signals, and the output end is connected to the MCU main control module (10), so as to provide a dimming signal; The output chopping module (30) is connected between the AC power supply, the MCU main control module (10) and the LED lamp, and is used to perform chopping dimming on the LED lamp; The method comprises the following steps: S1, obtaining the frequency and zero-crossing position of the input AC power supply through a zero-crossing detection module (20); S2, reading the configurations of the dialing module (40) and the fine-tuning module (50) and comparing them with the configuration of the NFC module (60); if the configuration of the NFC module (60) has changed, executing according to the phase-cut direction and the minimum phase-cut time configured for the NFC module (60); if the configuration of the NFC module (60) has not changed, executing according to the phase-cut direction configured for the dialing module (40) and the minimum phase-cut time configured for the fine-tuning module (50), and modifying the configuration of the NFC module (60); S3, reading and comparing the dimming values ​​of the dimming signal input modules (70), and calculating the output phase cutting time according to the dimming value of the dimming signal input module (70) with the smallest dimming value; S4, the MCU main control module (10) outputs a phase-cut PWM signal to the LED lamp according to the phase-cut direction and the phase-cut time and after the falling edge delay; In step S4, the following steps are also included: When the output is configured as a trailing edge phase-cut output and the dimming value is not zero and a zero-crossing position is detected, the MCU main control module (10) controls the PWM output to be high level and sets the timing time to be the output phase-cutting time converted from the dimming value; when the timing time is reached, the MCU main control module (10) turns off the PWM output and waits for the next zero-crossing position to turn it on again; When the leading edge phase-cut output is configured and the dimming value is not zero and a zero-crossing position is detected, the MCU main control module (10) controls the PWM output to be low level and sets the timing time to be the output phase-cutting time calculated by subtracting the dimming value from the cycle time T. When the timing time is reached, the MCU main control module (10) turns on the PWM output and waits for the next zero-crossing position to turn it off again; The following steps are also included: When the dimming signal input module (70) is not connected, the controller is configured to have a maximum output chopping time; When a dimming signal input module (70) is connected, the controller is configured such that when adjusting from maximum to minimum, the output chopping time changes from the maximum output chopping time to the minimum output chopping time until the output is turned off, and the output chopping time changes in real time following the dimming signal input module (70); When at least two dimming signal input modules (70) are connected, when any one of the dimming signal input modules (70) is adjusted, if there is another dimming signal input module (70) whose dimming value is smaller than the dimming value of the current dimming signal input module (70), then when the dimming signal input module (70) is adjusted, the output chopping time of the controller does not change until the dimming signal input module (70) is adjusted to a dimming value smaller than that of all other connected dimming signal input modules (70), and the output chopping time of the controller decreases in accordance with the current dimming signal input module (70).

2. A control method according to claim 1, characterized in that: The dimming signal input module (70) is configured as a DALI-PUSH module (70a), a DMX512 dimming module (70b) and / or a 0-10V dimming module (70c).

3. A control method according to claim 1, characterized in that: In step S2, the following steps are also included: After the phase-cut direction is configured through the NFC module (60) and the controller is restarted, if the configuration of the dial module (40) is unchanged, the phase-cut direction output by the controller is the phase-cut direction configured by the NFC module (60); if the NFC module (60) is configured with a phase-cut direction before power-on and the dial module (40) changes the phase-cut direction, the phase-cut direction output by the controller after power-on is the phase-cut direction configured by the dial module (40); if the configuration of the dial module (40) is changed after power-on, the phase-cut mode output by the controller after the next power-on is the phase-cut direction configured by the dial module (40).

4. A control method according to claim 1, characterized in that: In step S2, the following steps are also included: After the minimum phase-cut time is configured through the NFC module (60) and the controller is restarted, if the configuration of the fine-tuning module (50) is unchanged, the minimum phase-cut time output by the controller is the minimum phase-cut time configured by the NFC module (60); if the configuration of the fine-tuning module (50) is changed when power is turned on, the minimum phase-cut time output by the controller after power-on is the minimum phase-cut time configured by the fine-tuning module (50); if the configuration of the fine-tuning module (50) is changed after power is turned on, the minimum phase-cut time output by the controller changes accordingly.

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