WO2025201077A1 - Power line phase-cut communication control mode and led lamp control system - Google Patents

Abstract

The present invention relates to the field of phase-cut communication control and LED lamp control. Disclosed are a power line phase-cut communication control mode and an LED lamp control system. The method comprises: by means of a live-wire alternating-current sinusoidal wave signal, generating a zero-crossing interruption pulse signal (ZERO-PULSE), and controlling brief cutoffs at a rising edge or a falling edge of a half wave or a full wave, so as to generate equal-width narrow notches in the waveform; and by means of a new phase-cut notch definition mode, and by means of a transmitting mode of narrow left and right notches having the equal width, accurately analyzing digital signals in a half-wave or full-wave period on the basis of the number, position and superposed width of corresponding pulses, so as to achieve digital communication control for scenario modes, etc. Without the need of rewiring, the present invention can achieve intelligent control by merely replacing LED lamp drive and control devices, which involves an extremely low cost and is simple and convenient.

Description

A power line phase-cut communication control method and LED lamp control system Technical Field

The present invention relates to the fields of phase-cut communication control and LED lamp control, and in particular to a power line phase-cut communication control method and an LED lamp control system.

Background Art

Currently, communication methods for dimming control of LED lighting products on the market are categorized into two main types: wireless and wired. Wireless dimming control typically utilizes protocols such as Wi-Fi, Zigbee, and Bluetooth. This simplifies wiring, eliminates the need for signal cables, and is low-cost. However, wireless dimming control suffers from poor compatibility between different protocols and ecosystems, and its signal is significantly affected by the on-site environment, prone to signal dropouts, and exhibits poor stability. Wired dimming control primarily includes thyristor phase-cut dimming, 0-10V linear dimming, DALI and DMX512 digital dimming, and PLC power carrier dimming. Phase-cut dimming requires no wiring changes and is low-cost, but it suffers from flickering dimming, high energy loss, inability to adjust color, and loop-based control. 0-10V, DALI, and DMX512 offer excellent communication stability and dimming performance, but they all require separate signal control wiring, resulting in high modification costs and inconvenient debugging.

Among existing wired communication technologies, there is a PLC power carrier control method that transmits signals through power lines. It does not require signal lines, has simple wiring, can adjust the light and color, and can control each lamp individually. However, the current cost is relatively high, the carrier frequency is high, the transmission distance is short, and it is susceptible to interference. An isolator must be added separately at the front end, which is not easy to install.

In the prior art, there is also a controller that communicates through power line phase cutting, CN112637995B - A LED lamp control method, controller, LED lamp and control system thereof, which uses the large and small phase-cut gaps on the falling edge of sinusoidal alternating current to transmit data. This technical solution can solve the above-mentioned problems. However, large phase-cut gaps seriously damage the sinusoidal waveform, waste energy, and pollute the power grid. Due to the large and small gaps and different shutdown times, the loop maintenance circuit cannot accurately calculate parameters, resulting in useless energy loss.

Therefore, there is an urgent need to design a phase-cut communication controller that can reduce energy loss and enable precise control.

Summary of the Invention

Purpose of the invention: In response to the problems existing in the prior art, the present invention discloses a power line phase-cut communication control method and an LED lamp control system. Through a new phase-cut gap definition method, a transmission method of extremely small gaps of equal width on the left and right is adopted within a half-wave or full-wave cycle. By using different methods such as the number, position and superposition width of corresponding pulses, digital signals can be accurately analyzed to realize digital communication control such as scene modes. There is no need to rewire, and intelligence can be achieved by simply replacing the LED lamp drive and control equipment. The cost is extremely low and it is simple and convenient.

Technical solution: The present invention discloses a power line communication control method, comprising the following steps:

The phase-cut controller generates a zero-crossing interruption pulse signal ZERO-PULSE through the live AC sine wave signal, controlling the shortest shutdown of the rising or falling edge of the half-wave or full-wave, so that the waveform produces a very small gap of equal width;

With the half-wave period T/2 as the transmission rate, after the ZERO-PULSE signal is triggered, a right gap or a left gap and a right gap are formed in one half-wave;

Taking the full-wave period T as the transmission rate, after the ZERO-PULSE signal is triggered, within the full-wave signal period T, only one right gap is formed in the waveform of the first half cycle, or one right gap is formed in the waveform of the first and second half cycles; or within the full-wave signal period T, only one right gap is formed in the waveform of the first half cycle, or only one left gap is formed in the waveform of the second half cycle, where T is the period of the AC voltage waveform;

In different cycles of half-wave or full-wave of alternating current, the left and right gaps of the waveform are controlled according to the digital signal that needs to be transmitted. Then, according to the different combinations of left and right gaps, digital analysis is performed through the number, position and superposition width of the corresponding square wave signals to finally realize the transmission of digital signals.

Furthermore, with a half-wave period of T/2 as the transmission rate, after the zero-crossing ZERO-PULSE signal is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the half-wave produces a right gap corresponding to the duration of t, or after the zero-crossing ZERO-PULSE signal is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the half-wave produces a right gap corresponding to the duration of t, and immediately turns off for t time after the next half-wave crosses zero, so that the left rising edge of the half-wave produces a left gap corresponding to the duration of t; there is only one right gap in a half-wave, or one left gap and one right gap.

Furthermore, the AC voltage output waveform is rectified to form a waveform V_DC, and the waveform V_DC generates a square wave V_SW corresponding to the digital signal to be transmitted after passing through the signal detection circuit. In the square wave V_SW, if there is only one square wave corresponding to the right gap in the half-wave period, it means that the received digital signal is "0". If the two corresponding square wave widths of the right gap of the previous half wave and the left gap of the next half wave are continuously superimposed, it means that the received digital signal is "1". The digital information contained in the alternating current is parsed according to this rule.

Furthermore, with the full-wave period T as the transmission rate, after the zero-crossing signal ZERO-PULSE is triggered, the circuit is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half of the cycle produces a right gap corresponding to the duration of t, or after the zero-crossing signal ZERO-PULSE is triggered, the circuit is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half of the cycle produces a right gap corresponding to the duration of t, and after the duration of (T-t), the circuit is turned off again for t time, so that the right falling edge of the waveform in the second half of the cycle produces a right gap corresponding to the duration of t. Within the full-wave signal period T, there is only one right gap in the waveform in the first half of the cycle, or there is one right gap in the waveform in the first and second half cycles respectively.

Furthermore, the AC voltage output waveform is rectified to form a waveform V_DC, which is then passed through a signal detection circuit to generate a square wave V_SW corresponding to the digital signal to be transmitted. In the square wave V_SW, in a full wave period T, the square wave pulse generated by the right-side short circuit and the pulse generated by the zero-crossing interruption can both be used as synchronization pulses to determine the interval time of the next pulse.

When the square wave pulse corresponding to the right missing in the first half cycle waveform and the zero-crossing pulse in the second half cycle appear as a pair, it means that the received digital signal is "0";

When there is a corresponding square wave pulse with a right gap in the waveform of the first and second half cycles as a pair, it means that the received digital signal is "1". Other combinations are invalid. The digital information contained in the alternating current can be parsed based on this rule.

Furthermore, with the full-wave period T as the transmission rate, after the zero-crossing signal ZERO-PULSE is triggered, the circuit is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half of the cycle produces a right gap corresponding to the duration of t, or the circuit is turned on for T/2 after the zero-crossing signal in the full-wave period and then turned off for t time, so that the left rising edge of the waveform in the second half of the cycle produces a left gap corresponding to the duration of t. Within the full-wave signal period T, there is only a right gap in the waveform in the first half of the cycle, or there is only a left gap in the waveform in the second half of the cycle.

Furthermore, the AC voltage output waveform is rectified to form a waveform V_DC. After passing through the signal detection circuit, the waveform V_DC generates a square wave V_SW corresponding to the digital signal to be transmitted. In the square wave V_SW, the square wave generated after the zero-crossing trigger is turned on for (T/2)-t time indicates that the received digital signal is "0", and the square wave generated after the zero-crossing trigger is turned on for T/2 time indicates that the received digital signal is "1". Based on this rule, the digital information contained in the AC power can be parsed.

Furthermore, when the phase-cut controller uses half-wave period T/2 as the transmission rate, it will shut down at most twice for t time, and the gaps corresponding to the t time are located on both sides of the half-wave, with the left side being the rising edge and the right side being the falling edge, which are the left gap and the right gap respectively; when the full-wave period T is used as the transmission rate, each half-wave will be shut down at most once, and the shutdown time corresponding to the left gap is equal to the shutdown time corresponding to the right gap, and the shutdown time t=α*(T/2), where α is the preset coefficient, 0<α<0.5.

The present invention also discloses an LED lamp control system, including a phase-cut controller, a dimming driver and an LED lamp, wherein the phase-cut controller is connected to the dimming driver, and the dimming driver is connected to the signal input end of the LED lamp; the phase-cut controller and the dimming driver execute the power line communication control method as described above, the phase-cut controller obtains an AC voltage waveform, which serves as the input signal of the dimming driver, and the AC voltage waveform from the phase-cut controller is parsed by the dimming driver to become a digital signal to be transmitted.

Preferably, the phase-cutting controller includes a first input unit, a signal and power transmission unit, a power supply unit, a zero-crossing detection unit and a first single-chip microcomputer. One end of the signal and power transmission unit is connected to the first input unit, and the other end is respectively connected to the power supply unit, the zero-crossing detection unit and the first single-chip microcomputer. The power supply unit and the zero-crossing detection unit are also respectively connected to the first single-chip microcomputer. After the zero-crossing detection unit detects and generates a zero-crossing interrupt pulse ZERO-PULSE, the first single-chip microcomputer controls the signal and power transmission unit to control the different positions or numbers of waveform gaps within the half-wave or full-wave period of the live line AC, corresponding to different digital signals, and controls different combinations of left and right gaps of the AC half-wave signal according to the digital signal to be transmitted, thereby changing the AC voltage waveform to realize the transmission of the digital signal.

Preferably, the dimming driver includes a second input unit, a rectifier unit, and a second single-chip microcomputer connected in sequence, and also includes a discharge shaping unit and a signal detection unit. The AC voltage waveform from the phase-cut controller is rectified by the second input unit and the rectifier unit to generate a rectified waveform V_DC. When the input waveform encounters a gap, the discharge shaping unit instantly lowers V_DC and promptly generates a square wave V_SW corresponding to the digital signal to be transmitted through the signal detection unit. The square wave V_SW is parsed by the second single-chip microcomputer to become the digital signal to be transmitted.

Preferably, the discharge shaping unit generates a voltage division ratio by two voltage-dividing resistors, is connected to the base of the transistor, and controls the conduction and cutoff of the transistor. The collector of the transistor is connected to the base of the MOS tube. When the transistor is cut off, the collector voltage is pulled high, the MOS tube is turned on, and V_DC is instantly pulled down.

The signal detection unit consists of an adjustable shunt regulator TL431 and an optocoupler PC817, whose input end is connected to V_DC, the reference end pin of the adjustable shunt regulator TL431 is connected to two voltage-dividing resistors, the cathode of the optocoupler light-emitting diode of the optocoupler PC817 is connected to the cathode of TL431, the anode of the light-emitting diode is connected to the positive voltage VCC through a resistor, the emitter of the optocoupler transistor is grounded, and the collector is connected to the positive voltage 3.3V through a resistor, and the collector outputs a V_SW square wave pulse signal.

Beneficial effects

1. The control method designed in the present invention controls the extremely short shutdown of the rising or falling edge of a half-wave or full-wave, so that the waveform produces extremely small gaps of equal width. Since there is no need to distinguish between large and small gaps, equal extremely small gaps can be located on one side or both sides of the half-wave, which minimizes the damage to the AC sinusoidal waveform, wastes less energy, and pollutes the power grid less, making it environmentally friendly. Within different cycles of the AC half-wave or full-wave, the left and right gaps of the waveform are controlled according to the digital signal to be transmitted, forming different combinations, thereby changing the AC voltage waveform. Then, according to the different combinations of left and right gaps, digital analysis is performed through different logical methods such as the number, position, and superposition width of the corresponding square wave signals, ultimately realizing the transmission of digital signals. The present invention adopts a transmission method with extremely small gaps of equal width on the left and right within two different periods of half wave or full wave, which not only solves the problems of large impact current and interference during data transmission in the existing technology, but also avoids the energy waste caused by large gaps in the waveform, minimizes the damage to the AC sinusoidal waveform, reduces energy waste, and has less pollution to the power grid. It is green and environmentally friendly. At the same time, it simplifies the discharge shaping circuit, facilitates the precise design of the shaping circuit parameters, and reduces useless energy loss.

2. The technical solution of the present invention adopts a fixed turn-off time t to produce a very small gap of equal width, which also fixes the turn-off voltage value. Although the turn-off voltage corresponding to different T periods is different, since the t time is extremely short and the loss is extremely small, the shaping circuit sets the device parameters in the circuit according to the fixed voltage corresponding to the t time at the highest input voltage and the minimum T period. When the voltage is lower than this fixed voltage value, the discharge shaping circuit is started. The second microcontroller does not need to know the t time. The discharge shaping circuit can accurately calculate the matching parameters of the discharge circuit, avoiding the energy loss caused by the difference in turn-off voltage due to different gap sizes.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a block diagram of the overall structure of the LED lamp control system of the present invention;

FIG2 is a block diagram of a phase-cut controller of an LED lamp control system according to the present invention;

FIG3 is a block diagram of a dimming driver structure of an LED lamp control system according to the present invention;

FIG4 is a zero-crossing detection circuit diagram of an LED lamp control system according to the present invention;

FIG5 is a diagram of a discharge shaping circuit and a signal detection circuit of an LED lamp control system according to the present invention;

FIG6 is a signal waveform diagram of Example 1 of the present invention;

FIG7 is a signal waveform diagram of Example 2 of the present invention;

FIG8 is a signal waveform diagram of Example 3 of the present invention;

FIG9 is a comparison diagram of energy loss in Example 1 of the present invention and in the conventional large-deficit and small-deficit cases.

DETAILED DESCRIPTION

The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

The present invention discloses a power line phase-cut communication control method and an LED lamp control system. Referring to Figures 1 to 5, the LED lamp control system disclosed in the present invention includes a phase-cut controller, a dimming driver, and an LED lamp. The phase-cut controller is connected to the dimming driver, which is in turn connected to the signal input terminal of the LED lamp. The phase-cut controller generates a zero-crossing interrupt pulse signal ZERO-PULSE from a live AC sine wave signal and controls the extremely short shutdown of the rising or falling edge of a half-wave or full-wave, thereby generating extremely small gaps of equal width in the waveform. The phase-cut controller obtains an AC voltage waveform containing an extremely small gap, which serves as the input signal of the dimming driver. The AC voltage waveform from the phase-cut controller is parsed by the dimming driver to become a digital signal to be transmitted.

The phase-cut controller includes a first input unit, a signal and power transmission unit, a power supply unit, a zero-crossing detection unit, and a first single-chip microcomputer. Referring to FIG2 , one end of the signal and power transmission unit is connected to the first input unit, and the other end is connected to the power supply unit, the zero-crossing detection unit, and the first single-chip microcomputer, respectively. The power supply unit and the zero-crossing detection unit are also connected to the first single-chip microcomputer, respectively. After the phase-cut controller generates a zero-crossing interrupt pulse ZERO-PULSE, the signal and power transmission unit controls the different positions or numbers of waveform gaps within the half-wave or full-wave period of the live AC line, corresponding to different digital signals. According to the digital signal to be transmitted, the different combinations of left and right gaps of the AC half-wave signal are controlled, thereby changing the AC voltage waveform to realize the transmission of the digital signal. In the present invention, the signal and power transmission unit includes two control switches, and the two control switches are controlled by the first single-chip microcomputer at the same time. The first single-chip microcomputer realizes the conduction and shutdown of the signal by controlling the opening and closing of the two control switches.

The circuit diagram of the zero-crossing detection unit is shown in Figure 4. The base of the transistor is connected to the voltage divider between the two resistors, the collector is connected to the positive voltage VDD, and the emitter is grounded. After the AC power is rectified, the voltage change process generates a voltage divider ratio by the two resistors to form a voltage at the base of the transistor, which controls the on and off states of the transistor to alternate. When the voltage drops to zero, the transistor is cut off and the collector outputs a high level. When the voltage rises, the transistor is turned on and the collector outputs a low level. The two states alternate to generate a zero-crossing interrupt pulse signal.

The dimming driver includes a second input unit, a rectifier unit, and a second single-chip microcomputer connected in sequence, as well as a discharge shaping unit and a signal detection unit. The AC voltage waveform from the phase-cutting controller is rectified by the rectifier unit to generate a rectified waveform V_DC. When the input waveform encounters a gap, the discharge shaping unit instantly lowers V_DC and promptly generates a square wave V_SW corresponding to the digital signal to be transmitted through the signal detection unit. The square wave V_SW is parsed by the second single-chip microcomputer to obtain the digital signal to be transmitted. The digital signal parsed by the second single-chip microcomputer is dimmed through the dimming execution unit.

The dimming driver also includes a high power factor step-down unit, which steps down the voltage of the rectified AC power supply to supply power to the dimming execution unit. The high power factor step-down units here are conventional circuits on the market and will not be further described here.

The specific circuits of the discharge shaping unit and the signal detection unit are shown in Figure 5. The discharge shaping circuit mainly generates a voltage divider ratio by two voltage-dividing resistors, which are connected to the base of the transistor and control the conduction and cutoff of the transistor. The collector of the transistor is connected to the base of the MOS tube. When the transistor is cut off, the collector voltage is pulled high, the MOS tube is turned on, and V_DC is instantly pulled down.

The device parameters in the discharge shaping circuit are set according to the fixed voltage corresponding to the t time at the highest input voltage and the minimum T period. When the voltage drops below this fixed voltage value, the discharge shaping circuit is activated. The discharge shaping circuit instantly lowers the V_DC voltage, immediately creating a gap in the waveform, allowing the signal detection unit to successfully detect the complete square wave waveform, and ultimately the second single-chip microcomputer to parse the accurate digital signal. This technical solution uses a fixed off-time t. Although the off-voltage corresponding to different T periods is different, the t time is extremely short and the loss is extremely small. Therefore, the device parameters in the shaping circuit are set according to the fixed voltage corresponding to the t time at the highest input voltage and the minimum T period. When the voltage drops below this fixed voltage value, the discharge shaping circuit is activated, and the second single-chip microcomputer does not need to know the t time.

The signal detection circuit primarily consists of an adjustable shunt regulator TL431 and an optocoupler PC817. The input is connected to V_DC, the reference pin of the TL431 is connected to two voltage-divider resistors, the cathode of the optocoupler's light-emitting diode is connected to the cathode of the TL431, and the anode of the diode is connected to the positive voltage VCC through a resistor. The emitter of the optocoupler's transistor is grounded, and the collector is connected to a positive voltage of 3.3V through a resistor. The collector outputs a square wave pulse signal V_SW. When V_DC is high, the TL431 turns on, current flows through the optocoupler's diode, and the transistor portion of the optocoupler is in the on state, causing V_SW to output a low level. When V_DC drops to a low level, the TL431 turns off, the optocoupler's light-emitting diode stops operating, the transistor portion turns off, and V_SW outputs a high level.

The control method for the phase-cut controller and the dimming driver to perform power line communication specifically includes the following steps:

The phase-cut controller generates a zero-crossing interruption pulse signal ZERO-PULSE through the live AC sine wave signal, controlling the extremely short shutdown of the rising or falling edge of the half-wave or full-wave, so that the waveform produces extremely small gaps of equal width.

With the AC voltage half-wave period T/2 as the transmission rate, after the ZERO-PULSE signal is triggered, a right gap or a left gap and a right gap are formed in one half-wave.

Taking the full-wave period T of the AC voltage as the transmission rate, after the ZERO-PULSE signal is triggered, within the full-wave signal period T, only a right gap is formed in the waveform of the first half cycle, or a right gap is formed in the waveform of the first and second half cycles respectively; or within the full-wave signal period T, only a right gap is formed in the waveform of the first half cycle, or only a left gap is formed in the waveform of the second half cycle.

In different cycles of half-wave or full-wave of alternating current, the left and right gaps of the waveform are controlled according to the digital signal that needs to be transmitted. Then, according to the different combinations of left and right gaps, digital analysis is performed through the number, position and superposition width of the corresponding square wave signals to finally realize the transmission of digital signals.

Example

With a half-wave period of T/2 as the transmission rate, after the ZERO-PULSE signal is triggered, it is turned on for (T/2)-t and then turned off for t time, causing a right gap corresponding to the duration t on the right falling edge of the half-wave. Alternatively, after the ZERO-PULSE signal is triggered, it is turned on for (T/2)-t and then turned off for t time, causing a right gap corresponding to the duration t on the right falling edge of the half-wave. Immediately after the next half-wave crosses zero, it is turned off for t time, causing a left gap corresponding to the duration t on the left rising edge of the half-wave. In other words, there is only one right gap, or one left gap and one right gap, in a half-wave.

After rectification, the AC voltage output waveform forms a waveform V_DC. After passing through the signal detection circuit, the waveform V_DC generates a square wave V_SW corresponding to the digital signal to be transmitted. In the square wave V_SW, if there is only one square wave corresponding to the right gap within a half-wave period, it means that the received digital signal is "0". If the two corresponding square wave widths of the right gap of the previous half-wave and the left gap of the next half-wave are continuously superimposed, it means that the received digital signal is "1". This rule is used to parse the digital information contained in the AC power.

Referring to Figure 6 , the sinusoidal AC signal has no gaps in the first cycle T. In the second cycle T, the falling edge of the first half-wave produces a right gap, and the falling edge of the second half-wave also produces a right gap. Simultaneously, in the third cycle T, the rising edge of the first half-wave produces a left gap, its falling edge produces a right gap, and the rising edge of the second half-wave produces a left gap, and so on. Rectification produces the V_DC signal shown in Figure 6 . Signal detection generates a square wave pulse V_SW. The right gap of the first half-wave and the left gap of the second half-wave form a square wave pulse with a width of 2t, or the right gap of a half-wave forms a square wave pulse with a width of t. If there is only one square wave corresponding to a right gap within a half-wave cycle, the received digital signal is "0." If the right gap of the previous half-wave and the left gap of the next half-wave are continuously superimposed, the received digital signal is "1." The final digital signal is 01011, etc.

Referring to Figure 9, the sinusoidal diagram at the upper end of Figure 9 is the energy loss corresponding to the square wave pulse with a width of 2t in Example 1 of the present invention, wherein the shaded area is the energy loss. The sinusoidal diagram at the lower end of Figure 9 is the energy loss corresponding to the same 2t width of the traditional large gap. It can be seen from the figure that the present invention can significantly reduce the energy loss under the same shutdown time.

Example

Taking the full-wave period T as the transmission rate, after the zero-crossing signal ZERO-PULSE is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half of the cycle produces a right gap corresponding to the duration of t. Or after the zero-crossing signal ZERO-PULSE is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half of the cycle produces a right gap corresponding to the duration of t, and after the duration of (T-t), it is turned off again for t time, so that the right falling edge of the waveform in the second half of the cycle produces a right gap corresponding to the duration of t. Within the full-wave signal period T, there is only one right gap in the waveform in the first half of the cycle, or there is a right gap in the waveform in the first and second half cycles respectively.

The AC voltage output waveform is rectified to form waveform V_DC. After passing through a signal detection circuit, waveform V_DC generates a square wave V_SW corresponding to the desired digital signal. Within a full-wave period T of square wave V_SW, both the square wave pulses generated by a right-side gap and the pulses generated by a zero-crossing interruption can be used as synchronization pulses to determine the interval between subsequent pulses. A pair of a square wave pulse corresponding to a right-side gap in the first half of the waveform and a zero-crossing pulse in the second half indicates a "0" in the received digital signal. A pair of square wave pulses corresponding to a right-side gap in both the first and second halves of the waveform indicate a "1" in the received digital signal. Other combinations are invalid, allowing the digital information contained in the AC power to be parsed using this pattern.

Refer to Figure 7. Taking a full-wave cycle T as an example, in the first full-wave cycle T, the right falling edge of the waveform in the first half cycle produces a right gap corresponding to the duration of t, and the right falling edge of the waveform in the second half cycle produces a right gap corresponding to the duration of t. In the second full-wave cycle T, only the right falling edge of the waveform in the first half cycle produces a right gap corresponding to the duration of t. In the third full-wave cycle T, the right falling edge of the waveform in the first half cycle produces a right gap corresponding to the duration of t, and the right falling edge of the waveform in the second half cycle produces a right gap corresponding to the duration of t. In the fourth full-wave cycle T, only the right falling edge of the waveform in the first half cycle produces a right gap corresponding to the duration of t. Finally, after rectification, a square wave pulse is generated, and the final digital signal is 1010…

Example

Taking the full-wave period T as the transmission rate, after the zero-crossing signal ZERO-PULSE is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half of the cycle produces a right gap corresponding to the duration of t, or it is turned on for T/2 after the zero-crossing signal in the full-wave period and then turned off for t time, so that the left rising edge of the waveform in the second half of the cycle produces a left gap corresponding to the duration of t. In the full-wave signal period T, there is only a right gap in the waveform in the first half of the cycle, or there is only a left gap in the waveform in the second half of the cycle.

After rectification, the AC voltage output waveform forms a waveform V_DC. After passing through the signal detection circuit, the waveform V_DC generates a square wave V_SW corresponding to the digital signal to be transmitted. In the square wave V_SW, the square wave generated after the zero-crossing trigger is turned on for (T/2)-t indicates that the received digital signal is "0". The square wave generated after the zero-crossing trigger is turned on for T/2 indicates that the received digital signal is "1". This rule is used to parse the digital information contained in the AC power.

Refer to Figure 8. Taking a full-wave cycle T as an example, during the first full-wave cycle T, the right falling edge of the waveform in the first half of the cycle produces a right gap corresponding to the duration of t. During the second full-wave cycle T, the right falling edge of the waveform in the first half of the cycle produces a right gap corresponding to the duration of t. During the third full-wave cycle T, the left rising edge of the waveform in the second half of the cycle produces a left gap corresponding to the duration of t. During the fourth full-wave cycle T, the left rising edge of the waveform in the second half of the cycle produces a left gap corresponding to the duration of t. Finally, after rectification, a square wave pulse is generated, and the final digital signal is 0011...

The above three embodiments are only three typical and easy-to-analyze combination forms listed in the present invention. The combination forms that can be used for analysis include but are not limited to the above three. The above implementation methods are only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It does not limit the scope of protection of the present invention. The fields of application of the technical concept of the present invention include but are not limited to the field of LED lamp control. Other control fields such as motor speed control and temperature control are also applicable to the technical concept and spirit of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims (12)

A power line communication control method, characterized by comprising the following steps: The phase-cut controller generates a zero-crossing interruption pulse signal ZERO-PULSE through the live AC sine wave signal, controlling the shortest shutdown of the rising or falling edge of the half-wave or full-wave, so that the waveform produces a very small gap of equal width; With the AC voltage half-wave period T/2 as the transmission rate, after the ZERO-PULSE signal is triggered, a right gap or a left gap and a right gap are formed in one half-wave; Taking the full-wave period T of the AC voltage as the transmission rate, after the ZERO-PULSE signal is triggered, within the full-wave signal period T, only a right gap is formed in the waveform of the first half cycle, or a right gap is formed in the waveform of the first and second half cycles respectively; or within the full-wave signal period T, only a right gap is formed in the waveform of the first half cycle, or only a left gap is formed in the waveform of the second half cycle; In different cycles of half-wave or full-wave of alternating current, the left and right gaps of the waveform are controlled according to the digital signal that needs to be transmitted. Then, according to the different combinations of left and right gaps, digital analysis is performed through the number, position and superposition width of the corresponding square wave signals to finally realize the transmission of digital signals. A power line communication control method according to claim 1, characterized in that, with a half-wave period T/2 as the transmission rate, after the zero-crossing ZERO-PULSE signal is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the half-wave produces a right gap corresponding to the duration of t, or after the zero-crossing ZERO-PULSE signal is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the half-wave produces a right gap corresponding to the duration of t and is immediately turned off for t time after the next half-wave crosses zero, so that the left rising edge of the half-wave produces a left gap corresponding to the duration of t; there is only one right gap in a half-wave, or there is one left gap and one right gap. A power line communication control method according to claim 2, characterized in that the AC voltage output waveform is rectified to form a waveform V_DC, and the waveform V_DC generates a square wave V_SW corresponding to the digital signal to be transmitted after passing through a signal detection circuit. In the square wave V_SW, if there is only one square wave corresponding to the right gap in a half-wave period, it indicates that the received digital signal is "0"; if the two corresponding square wave widths of the right gap of the previous half-wave and the left gap of the next half-wave are continuously superimposed, it indicates that the received digital signal is "1", and the digital information contained in the alternating current is parsed according to this rule. A power line communication control method according to claim 1, characterized in that, with the full-wave period T as the transmission rate, after the zero-crossing signal ZERO-PULSE is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half cycle produces a right gap corresponding to the duration of t, or after the zero-crossing signal ZERO-PULSE is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half cycle produces a right gap corresponding to the duration of t and is turned off again for t time after (T-t) time, so that the right falling edge of the waveform in the second half cycle produces a right gap corresponding to the duration of t, and within the full-wave signal period T, there is only one right gap in the waveform in the first half cycle or there is a right gap in the waveform in the first and second half cycles respectively. The power line communication control method according to claim 4 is characterized in that the AC voltage output waveform is rectified to form a waveform V_DC, and the waveform V_DC is passed through a signal detection circuit to generate a square wave V_SW corresponding to the digital signal to be transmitted. In the square wave V_SW, in a full wave period T, the square wave pulse generated by the right gap and the pulse generated by the zero-crossing interruption can both be used as synchronization pulses to determine the interval time of the next pulse; When the square wave pulse corresponding to the right missing in the first half cycle waveform and the zero-crossing pulse in the second half cycle appear as a pair, it means that the received digital signal is "0"; When there is a corresponding square wave pulse with a right gap in the waveform of the first and second half cycles as a pair, it means that the received digital signal is "1". Other combinations are invalid. The digital information contained in the alternating current can be parsed based on this rule. A power line communication control method according to claim 1, characterized in that, with the full-wave period T as the transmission rate, after the zero-crossing signal ZERO-PULSE is triggered, it is turned on for (T/2)-t and then turned off for t time, so that the right falling edge of the waveform in the first half cycle produces a right gap corresponding to the duration of t, or it is turned on for T/2 after the full-wave period zero-crossing signal and then turned off for t time, so that the left rising edge of the waveform in the second half cycle produces a left gap corresponding to the duration of t. Within the full-wave signal period T, there is only a right gap in the waveform in the first half cycle, or there is only a left gap in the waveform in the second half cycle. A power line communication control method according to claim 6, characterized in that the AC voltage output waveform is rectified to form a waveform V_DC, and the waveform V_DC generates a square wave V_SW corresponding to the digital signal to be transmitted after passing through a signal detection circuit. In the square wave V_SW, the square wave generated after the zero-crossing trigger is turned on for (T/2)-t time indicates that the received digital signal is "0", and the square wave generated after the zero-crossing trigger is turned on for T/2 time indicates that the received digital signal is "1", and the digital information contained in the AC power is parsed according to this rule. A power line communication control method according to claim 1, characterized in that the phase-cut controller shuts down at most twice for t time when the half-wave period T/2 is used as the transmission rate, and the gap corresponding to the t time is located on both sides of the half-wave, with the left side being the rising edge and the right side being the falling edge, which are the left gap and the right gap respectively; when the full-wave period T is used as the transmission rate, each half-wave is shut down at most once, and the shutdown time corresponding to the left gap is equal to the shutdown time corresponding to the right gap, and the shutdown time t=α*(T/2), where α is a preset coefficient, 0<α<0.5. An LED lamp control system, characterized in that it includes a phase-cut controller, a dimming driver and an LED lamp, the phase-cut controller is connected to the dimming driver, and the dimming driver is connected to the signal input end of the LED lamp; the phase-cut controller and the dimming driver execute the power line communication control method as described in any one of claims 1 to 8, the phase-cut controller obtains an AC voltage waveform as an input signal of the dimming driver, and the AC voltage waveform from the phase-cut controller is parsed by the dimming driver to become a digital signal to be transmitted. An LED lamp control system according to claim 9, characterized in that the phase-cutting controller includes a first input unit, a signal and power transmission unit, a power supply unit, a zero-crossing detection unit and a first single-chip microcomputer, one end of the signal and power transmission unit is connected to the first input unit, and the other end is respectively connected to the power supply unit, the zero-crossing detection unit and the first single-chip microcomputer, the power supply unit and the zero-crossing detection unit are also respectively connected to the first single-chip microcomputer, after the zero-crossing detection unit detects and generates a zero-crossing interrupt pulse ZERO-PULSE, the first single-chip microcomputer controls the signal and power transmission unit to control the different positions or numbers of waveform gaps within the half-wave or full-wave period of the live AC line, corresponding to different digital signals, and controls different combinations of left and right gaps of the AC half-wave signal according to the digital signal to be transmitted, thereby changing the AC voltage waveform to realize the transmission of digital signals. An LED lamp control system according to claim 9, characterized in that the dimming driver includes a second input unit, a rectifier unit, and a second single-chip microcomputer connected in sequence, and also includes a discharge shaping unit and a signal detection unit. The AC voltage waveform from the phase-cut controller is rectified by the second input unit and the rectifier unit to generate a rectified waveform V_DC. When the input waveform encounters a gap, the discharge shaping unit instantly lowers V_DC and promptly generates a square wave V_SW corresponding to the digital signal to be transmitted through the signal detection unit. The square wave V_SW is parsed by the second single-chip microcomputer to become the digital signal to be transmitted. The LED lamp control system according to claim 11 is characterized in that the discharge shaping unit generates a voltage division ratio by two voltage-dividing resistors, is connected to the base of the transistor, and controls the conduction and cutoff of the transistor. The collector of the transistor is connected to the base of the MOS tube. When the transistor is cut off, the collector voltage is pulled high, the MOS tube is turned on, and V_DC is instantly pulled low. The signal detection unit consists of an adjustable shunt regulator TL431 and an optocoupler PC817, whose input end is connected to V_DC, the reference end pin of the adjustable shunt regulator TL431 is connected to two voltage-dividing resistors, the cathode of the optocoupler light-emitting diode of the optocoupler PC817 is connected to the cathode of TL431, the anode of the light-emitting diode is connected to the positive voltage VCC through a resistor, the emitter of the optocoupler transistor is grounded, and the collector is connected to the positive voltage 3.3V through a resistor, and the collector outputs a V_SW square wave pulse signal.