A method of controlling signal transmission and a control system thereof

Abstract

The application provides a control signal transmission method and a control system thereof. When the instantaneous voltage of an alternating voltage is less than a first filter capacitor voltage, and the rising edge and / or the falling edge of the alternating voltage reaches a preset voltage point, a switch control signal carrying load control information is sequentially outputted, the first AC input output end and the AC output end are sequentially controlled to be connected and disconnected, so that the waveform of the AC output end outputted alternating voltage has a notch corresponding to the switch control signal, and then the alternating voltage is rectified and shaped to output a second square wave pulsating DC voltage. According to the second square wave pulsating DC voltage, the control information is decoded and outputted, and the corresponding load is controlled to switch the operation state. Therefore, the control signal can be transmitted in the rectification filtering process without using voltage, i.e. in the no-current state, and the power line signal transmission is realized at low cost. Meanwhile, the transmission of the control signal in the no-current state can significantly reduce the interference of the signal transmission and improve the efficiency and quality of the control signal transmission.

Description

Technical Field

[0001] This invention relates to the field of signal transmission technology, and in particular to a control signal transmission method and its control system. Background Technology

[0002] In AC power supply systems, power line carrier communication technology is commonly used to transmit control signals. However, when the system only needs to transmit a few simple commands, adopting a complete power line carrier communication scheme introduces high complexity and cost, which is not conducive to its promotion in low-cost, low-complexity application scenarios.

[0003] Meanwhile, in rectifier and filter circuits widely used in AC power supply systems, capacitors, as core energy storage and filtering components, play a crucial role in the smoothness of the output DC voltage and the stability of the system. Their working principle is as follows: during the peak period of the pulsating DC voltage after rectification, the capacitor is charged to store energy; when the voltage enters the trough stage, the capacitor discharges to the load, thereby filling the "gap" in the voltage waveform, effectively suppressing ripple, and making the output voltage closer to pure DC.

[0004] However, under normal circumstances, due to the limitations of capacitor charging and discharging characteristics, in certain intervals of the AC voltage cycle, when the instantaneous voltage is lower than the voltage across the capacitor, the diodes in the rectifier bridge are in the off state, resulting in no current flowing in the power supply circuit during that period. Consequently, the corresponding voltage resources are not effectively utilized, leading to a waste of energy.

[0005] Therefore, it is necessary to develop a new method for transmitting control signals and its control system, which can make full use of the energy transfer gap in the existing rectifier and filter circuit without increasing the system complexity, and achieve simple and low-cost signal transmission. Summary of the Invention

[0006] To address the technical problem in existing rectifier filter circuits where the diodes in the rectifier bridge are in a cutoff state when the instantaneous AC input voltage is lower than the voltage across the capacitor, resulting in no current flowing in the power supply circuit during that period and the corresponding voltage resources not being effectively utilized, this invention provides a control signal transmission method and its control system.

[0007] A control signal transmission method includes: Step S1, a first AC input terminal and a corresponding AC output terminal are continuously connected, so that the AC output terminal outputs an AC voltage, which is then received by a second AC input terminal and output to a first rectifier and filter module; wherein the first rectifier and filter module includes a first rectifier bridge and a first filter capacitor; Step S2, the AC voltage is rectified by the first rectifier bridge to obtain a unidirectional pulsating voltage and then output in two paths, one path is directly rectified into a first square wave pulsating DC voltage and output to a first signal processing module; the other path is filtered by the first filter capacitor to obtain a first DC voltage to drive the corresponding load; Step S3, the first signal processing module decodes the received first square wave pulsating DC voltage to obtain control information and maintains the original operating state of the load; Step S4, a first control signal for controlling the operating state of the load is output, and a second signal processing module receives the first control signal and reads it to generate the corresponding... The second control signal includes several consecutive switching control signals. Step S5: When the rising edge and / or falling edge of the AC voltage reaches a preset voltage point, the second signal processing module outputs the switching control signals sequentially, controlling the sequential switching between the first AC input terminal and the corresponding AC output terminal, thereby generating several gaps on the waveform of the AC voltage output from the AC output terminal that correspond one-to-one with the switching control signals. When the preset voltage point is reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor. Step S6: After receiving the AC voltage in step S5, the second AC input terminal outputs it to the first rectification and filtering module, which rectifies and shapes the AC voltage to output a second square wave pulsating DC voltage. Step S7: The first signal processing module sequentially receives the second square wave pulsating DC voltage and decodes and outputs control information based on the second square wave pulsating DC voltage to control the corresponding load to switch its operating state.

[0008] Preferably, the preset trigger voltage points include preset trigger voltage point |A| and preset trigger voltage point |B|. When the rising edge of the positive half-wave and / or the falling edge of the negative half-wave of the AC voltage reaches preset trigger voltage point |A|, and / or when the falling edge of the positive half-wave and / or the rising edge of the negative half-wave of the AC voltage reaches preset trigger voltage point |B|, the second signal processing module outputs the switch control signal sequentially; wherein, when the preset trigger voltage points |A| and |B| are reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor.

[0009] Preferably, when the rising edge and / or falling edge of the AC voltage reaches the preset trigger voltage point |A| and preset trigger voltage point |B|, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor, and the first rectifier filter module is in a no-current state; the method for obtaining the preset trigger voltage point |A| and preset trigger voltage point |B| is as follows: Step S51, real-time detection of the loop current of the first rectifier filter module, obtaining the time interval during which the current of the first rectifier filter module drops to zero current, synchronously detecting and obtaining the absolute value of the instantaneous voltage value of the AC voltage within the time interval, and then determining the instantaneous voltage interval corresponding to the AC voltage when the first rectifier filter module is in a no-current state; Step S52, preset a signal transmission voltage interval, and obtaining the overlapping interval of the instantaneous voltage interval and the signal transmission voltage interval; Step S53, selecting two different voltage points in the overlapping interval, respectively as the preset trigger voltage point |A| and preset trigger voltage point |B|, wherein the preset trigger voltage point |A| is selected as the upper limit voltage point within the overlapping interval, and the preset trigger voltage point |B| is selected as the lower limit voltage point within the overlapping interval.

[0010] Preferably, the several consecutive switch control signals are divided into N groups. Whenever the rising edge and / or falling edge of the AC voltage reaches a preset voltage point, the second signal processing module outputs a group of switch control signals in sequence until the switch control signals are sent. The last switch control signal in each group is used to control the connection between the first AC input terminal and the corresponding AC output terminal.

[0011] Preferably, the load is a lamp, and the control information consists of several control instructions, each consisting of a data frame header, channel signals, and brightness values; the channel signals include, but are not limited to, any one or more of the following: R channel signals, G channel signals, B channel signals, and W channel signals.

[0012] The present invention also provides a control signal transmission system, including a transmitting end and at least one receiving end; the transmitting end includes a first AC input terminal, an AC output terminal, a high-speed switching module, and a second signal processing module; the first AC input terminal is electrically connected to the AC output terminal through the high-speed switching module; the second signal processing module is electrically connected to the first AC input terminal and the high-speed switching module respectively; the receiving end includes a second AC input terminal, a first rectifier and filter module, a signal separation module, a first signal processing module, and at least one load; the second AC input terminal is electrically connected to the first signal processing module through the first rectifier and filter module; the signal separation ... first signal processing module, a signal separation module, and at least one load respectively. The first rectifier and filter module and the first signal processing module are electrically connected; the load is electrically connected to the first signal processing module; the first rectifier and filter module includes a first rectifier bridge and a first filter capacitor connected in parallel at the output terminal of the first rectifier bridge; the AC output terminal is used to output an AC voltage; the first rectifier bridge is used to rectify the AC voltage to obtain a unidirectional pulsating voltage, and respectively send it to the first filter capacitor and the signal separation module; the first filter capacitor is used to filter the received unidirectional pulsating voltage to obtain a first DC voltage to drive the load; the signal separation module is used to shape the unidirectional pulsating voltage into a square wave pulsating DC voltage and output it; the first signal processing module... The first control module controls the operating state of the load based on the received square wave pulsating DC voltage; the square wave pulsating DC voltage includes a first square wave pulsating DC voltage and a second square wave pulsating DC voltage; the second signal processing module receives a first control signal and then reads and generates a corresponding second control signal; wherein, the first control signal is used to control the operating state of the load; the second control signal includes a plurality of consecutive switching control signals; when the second signal processing module generates the second control signal, the high-speed switching module remains on, the signal separation module outputs the first square wave pulsating DC voltage, and the first signal processing module controls the load to maintain its original state based on the first square wave pulsating DC voltage. There is an operating state; when the second signal processing module generates the second control signal, and when the rising edge and / or falling edge of the AC voltage reaches the preset voltage point, the second signal processing module is also used to output the switch control signal in sequence and control the sequential on / off of the high-speed switch module, so that a number of gaps corresponding to the switch control signal are generated on the waveform of the AC voltage output at the AC output terminal; wherein, when the preset voltage point is reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor; the signal separation module outputs a second square wave pulsating DC voltage, and the first signal processing module obtains control information based on the second square wave pulsating DC voltage and switches the operating state of the corresponding load.

[0013] Preferably, the transmitting end further includes a second rectification and filtering module and a voltage detection module for detecting the magnitude of the AC voltage. The second rectification and filtering module includes a second rectifier bridge and a second filter capacitor. The AC port 1 and AC port 2 of the second rectifier bridge are respectively connected to the first end and the second end of the first AC input terminal. The second filter capacitor is connected in parallel between the V+ pin and the V- pin of the second rectifier bridge, and the first end of the second filter capacitor is connected to the VDD pin of a first linear regulator, and the second end is grounded. The V- pin of the second rectifier bridge is connected to the GND pin of the first linear regulator, and the OUT pin of the first linear regulator is connected to the second signal processing module. The voltage detection module includes resistors R1, R2, and R3 and a diode D1. The resistor R1 is connected in parallel between the V+ pin and the V- pin of the second rectifier bridge. One end of the resistor R2 is connected to one end of the resistor R1 and the anode of the diode D1, and the other end is connected to the resistor R3 and then to the second signal processing module. The other end of the resistor R3 is grounded. The cathode of the diode D1 is connected to the first end of the first filter capacitor.

[0014] Preferably, the high-speed switching module includes a first N-MOS transistor, a P-MOS transistor, a first optocoupler, a second optocoupler, a third optocoupler, and a fourth optocoupler; pin 1 of the first optocoupler and the second optocoupler are both externally connected to a DC power supply; pin 3 of the first optocoupler is connected to the source of the first N-MOS transistor, and the source of the first N-MOS transistor is connected to the first terminal of the first AC input terminal; pin 4 of the first optocoupler is connected to the gate of the first N-MOS transistor and is also connected to pin 3 of the third optocoupler; pin 3 of the second optocoupler is connected to the gate of the P-MOS transistor and is also connected to pin 4 of the fourth optocoupler; the drain of the P-MOS transistor is connected to the first terminal of the AC output terminal; the drain of the first N-MOS transistor is connected to the source of the P-MOS transistor, and... The fourth pin of the second optocoupler is connected to the source of the P-MOS transistor; the source and gate of the first N-MOS transistor are connected by a resistor R4, and the source and gate of the P-MOS transistor are connected by a resistor R5; the second pin of both the third and fourth optocouplers is grounded; the fourth pin of the third optocoupler is connected to the second terminal of the first AC input and to the third pin of the fourth optocoupler, and the third pin of the fourth optocoupler is connected to the second terminal of the first AC input; a capacitor C1 is provided between the third pin of the first optocoupler and the fourth pin of the third optocoupler, and a capacitor C2 is provided between the fourth pin of the second optocoupler and the third pin of the fourth optocoupler; the second pin of the first and second optocouplers and the first pin of the third and fourth optocouplers are all connected to the second signal processing module.

[0015] Preferably, the high-speed switching module includes a second N-MOS transistor, a third N-MOS transistor, a fifth optocoupler, a sixth optocoupler, a seventh optocoupler, and an eighth optocoupler; pin 1 of both the fifth and eighth optocouplers is externally connected to a DC power supply; pin 3 of the fifth optocoupler is connected to the source of the second N-MOS transistor and is connected to pin 4 of the seventh optocoupler through a capacitor C3; the source of the second N-MOS transistor is connected to the first terminal of the first AC input terminal; pin 4 of the fifth optocoupler is connected to the gate of the second N-MOS transistor and is connected to pin 3 of the seventh optocoupler; a resistor R6 connects the source and gate of the second N-MOS transistor; pin 3 of the sixth optocoupler is connected to pin 4 of the eighth optocoupler, and the... Pin 4 of the eighth optocoupler is connected to the gate of the third N-MOS transistor; pin 4 of the sixth optocoupler is connected to pin 3 of the eighth optocoupler through a capacitor C4, and is also connected to the first terminal of the AC output terminal; pin 4 of the seventh optocoupler is also connected to the second terminal of the first AC input terminal; pin 4 of the eighth optocoupler is connected to the gate of the third N-MOS transistor, and the drain of the third N-MOS transistor is connected to the first terminal of the AC output terminal; the source and gate of the third N-MOS transistor are connected through a resistor R7; pins 2 of the sixth and seventh optocouplers are both grounded; pins 2 of the fifth and eighth optocouplers and pins 1 of the sixth and fifth / sixth optocouplers are all connected to the second signal processing module.

[0016] Preferably, the signal separation module includes resistors R8, R9, and R10, diodes D2, D3, and D4; resistor R8 is connected in parallel between the V+ and V- pins of the first rectifier bridge; one end of resistor R9 is connected to one end of resistor R8 and the anode of diode D2, and the other end is connected to the cathode of diode D3; the cathode of diode D2 is connected to the first end of the first filter capacitor; the first end of the first filter capacitor is also electrically connected to the second signal processing module, and the second end is connected to the V- pin of the first rectifier bridge and grounded; the anode of diode D3 is connected to the first signal processing module, and it is grounded through resistor R10; a diode D4 is connected in parallel across resistor R10.

[0017] The beneficial effects of this invention are as follows: This invention provides a control signal transmission method and control system. When the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor, that is, when the first rectifier and filter module is in a no-current state, and when the rising edge and / or falling edge of the AC voltage reaches a preset voltage point, a switch control signal carrying load control information is sequentially output. This controls the sequential switching between the first AC input terminal and the corresponding AC output terminal, resulting in several gaps on the waveform of the AC voltage output at the AC output terminal that correspond one-to-one with the switch control signal. After rectifying and shaping the AC voltage to output a second square wave pulsating DC voltage, control information is decoded and output based on the second square wave pulsating DC voltage to control the corresponding load to switch its operating state. This achieves control signal transmission even when no voltage is used during the rectification and filtering process, i.e., when there is no current, without the need for additional power or signal transmission channels or carrier signals. This allows for low-cost signal transmission via power lines without affecting power transmission. Furthermore, transmitting control signals in a no-current state significantly reduces signal transmission interference, effectively improving the efficiency and quality of control signal transmission. Attached Figure Description

[0018] Figure 1 A flowchart illustrating a control signal transmission method provided by the present invention; Figure 2 A schematic diagram of the circuit structure of the transmitting end of the signal transmission system provided in Embodiment 1; Figure 3 A schematic diagram of the circuit structure of the transmitting end of the signal transmission system provided in Embodiment 2; Figure 4 A schematic diagram of the circuit structure of the receiving end of the signal transmission system provided by the present invention; Figure 5 The waveform diagrams of AC voltage with waveform gap (a) and unidirectional pulse voltage with waveform gap (b) provided for the present invention; Figure 6 The diagram shows the waveforms of the first DC voltage (c) and the DC voltage (e) composed of the first square wave pulsating DC voltage (d) and the second square wave pulsating DC voltage provided for this invention. Attached Figure Labels

[0019] 1. First AC input terminal; 2. AC output terminal; 3. High-speed switching module; 4. Second signal processing module; 5. Second AC input terminal; 6. First rectification and filtering module; 7. Signal separation module; 8. First signal processing module; 9. Load; 10. Second rectification and filtering module; 11. Voltage detection module; Q1, First N-MOS transistor; Q2, P-MOS transistor; U1, First optocoupler; U2, Second optocoupler; U3, Third optocoupler; U4, Fourth optocoupler; Q3, Second N-MOS transistor; Q4, Third N-MOS transistor; U5, Fifth optocoupler; U6, Sixth optocoupler; U7, Seventh optocoupler; U8, Eighth optocoupler. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. Example 1

[0021] refer to Figure 1 and Figure 5 As shown, a control signal transmission method includes: Step S1: The first AC input terminal 1 and the corresponding AC output terminal 2 are continuously connected, so that the AC output terminal 2 outputs an AC voltage, which is then received by a second AC input terminal 5 and output to a first rectifier and filter module 6; wherein, the first rectifier and filter module 6 includes a first rectifier bridge and a first filter capacitor C6.

[0022] Step S2: The AC voltage is rectified by the first rectifier bridge to obtain a unidirectional pulsating voltage and then output in two paths. One path is directly rectified into a first square wave pulsating DC voltage and output to a first signal processing module 8; the other path is filtered by the first filter capacitor C6 to obtain a first DC voltage to drive the corresponding load 9.

[0023] In use, the first AC input terminal 1 is connected to an external AC power supply; the AC output terminal 2 outputs AC voltage to the second AC input terminal 5, and the AC voltage is divided into two outputs after obtaining a unidirectional pulsating voltage. One output is shaped and sent to the first signal processing module 8. When the instantaneous voltage of the AC voltage is greater than the voltage on the first filter capacitor C6, the other filter obtains the first DC voltage to drive the load 9 and supply power to the load 9. When the instantaneous voltage of the AC voltage is less than the voltage on the first filter capacitor C6, the first rectifier and filter module 6 is in a no-current state, and the first filter capacitor C6 discharges to supply power to the load 9, maintaining the voltage and current of the load 9.

[0024] Step S3: The first signal processing module 8 decodes the unobtained control information based on the received first square wave pulsating DC voltage and maintains the original operating state of the load 9.

[0025] Specifically, steps S1-S3 are the load power supply and control process when no control signal is input. The first square wave pulsating DC voltage received by the first signal processing module 8 is a normally transmitted and unprocessed voltage. After decoding, the first signal processing module 8 fails to obtain relevant information for controlling the load 9, which means that the operating state of the load 9 does not need to be changed. At this time, the load 9 has been powered on, and the first signal processing module 8 controls the load 9 to maintain its original operating state.

[0026] Step S4: Output a first control signal for controlling the operating state of load 9, and receive the first control signal through a second signal processing module to generate a corresponding second control signal; wherein, the second control signal includes several consecutive switching control signals.

[0027] Specifically, the second signal processing module 4 can decode the received first control signal according to a preset communication protocol, converting it from a physical level signal into control data that can be processed by the program. The control data includes the target operating state instruction of the load 9. Next, the second signal processing module 4 parses and logically transforms the control data according to a preset processing program, thereby converting the control data into timing instructions for controlling the on / off state of the high-speed switching module 3; finally, the second signal processing module 4 converts the on / off timing instructions into a second control signal including a number of consecutive switching control signals.

[0028] In some embodiments, the first control signal is the same as the second control signal, and the second signal processing module 4 can directly obtain a number of consecutive switching control signals based on the first control signal.

[0029] In some embodiments, the first control signal includes a plurality of control data for controlling the operating states of different loads 9. The second signal processing module 4 can read any one of the control data according to the load 9 to be controlled, and then process it to control the operating state of the corresponding load 9. Similarly, the second signal processing module 4 can read multiple control data according to multiple loads 9 to be controlled, and then process and output them respectively to control the operating states of the multiple loads 9.

[0030] Step S5: When the rising edge and / or falling edge of the AC voltage reaches the preset voltage point, the second signal processing module 4 outputs the switch control signal sequentially, controlling the first AC input terminal 1 and the corresponding AC output terminal 2 to be switched on and off sequentially, thereby generating several gaps on the waveform of the AC voltage output by the AC output terminal 2 that correspond one-to-one with the switch control signal; wherein, when the preset voltage point is reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor.

[0031] Specifically, a series of consecutive switching control signals carry specific control information of load 9. When the first switching control signal is output, the previously continuously conducting first AC input terminal 1 and AC output terminal 2 are disconnected. As the next switching control signal is output, the disconnected first AC input terminal 1 and AC output terminal 2 are reconnected, and this cycle repeats until the last switching control signal is output, at which point the first AC input terminal 1 and AC output terminal 2 return to a continuously conducting state. During the sequential output of the switching control signals, the first AC input terminal 1 and AC output terminal 2 are continuously switched on and off within a specific time period, resulting in continuous waveform gaps of different sizes with specific timing on the voltage waveform output by AC output terminal 2. This transfers the specific control information of load 9 carried by the switching control signals onto the AC voltage for transmission, thus achieving information conversion and transmission. At this time, these gaps carry the specific control information of load 9.

[0032] Under normal circumstances, when the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor, the first rectifier and filter module 6 is in a no-current state. The second signal processing module 4 only outputs the switch control signal sequentially when the rising and / or falling edge of the AC voltage reaches the preset voltage point. This utilizes the unused voltage during the rectification and filtering process, i.e., the time period when the voltage is in a no-current state. The corresponding control signal is then transmitted when the rising and / or falling edge of the AC voltage reaches the preset voltage point. This eliminates the need for additional power or signal transmission channels or carrier signals, achieving low-cost signal transmission over power lines without affecting power transmission. Furthermore, transmitting control signals in a no-current state significantly reduces interference, effectively improving the efficiency and quality of control signal transmission.

[0033] In special cases, due to differences in circuit design or other reasons, a small current may exist in the first rectifier and filter module 6 during the rectification and filtering process, even when the instantaneous AC voltage is lower than the voltage of the first filter capacitor. In this case, utilizing this moment to transmit control signals still utilizes a special section of the rectification and filtering process, and signal transmission can be achieved without the need for additional power or signal transmission channels or carrier signals. Furthermore, compared to other times, even if a certain current exists, it is smaller and necessarily less than other times. Therefore, the interference of transmitting control signals at this moment is still much less than at other times, effectively improving the efficiency and quality of control signal transmission.

[0034] Preferably, the several consecutive switch control signals are divided into N groups. Whenever the rising edge and / or falling edge of the AC voltage reaches a preset voltage point, the second signal processing module 4 outputs a group of switch control signals in sequence until the switch control signals are sent. The last switch control signal in each group is used to control the first AC input terminal 1 to connect with the corresponding AC output terminal 2.

[0035] Since the signal transmission time after the rising and / or falling edge of the AC voltage reaches the preset voltage point is limited, the signal cannot be transmitted all at once. Therefore, the signal to be transmitted is divided into N groups and transmitted at different times to complete the transmission of all control information. For example, when the load 9 is a lamp, the switch control signal may include control instructions for controlling several color channels. In this case, the color instructions for each channel can be transmitted separately as single-channel or multi-channel control instructions to complete the transmission of the entire lamp instruction.

[0036] The preset trigger voltage points include preset trigger voltage point |A| and preset trigger voltage point |B|. When the rising edge of the positive half-wave and / or the falling edge of the negative half-wave of the AC voltage reaches preset trigger voltage point |A|, and / or the falling edge of the positive half-wave and / or the rising edge of the negative half-wave of the AC voltage reaches preset trigger voltage point |B|, the second signal processing module 4 outputs the switch control signal sequentially; wherein, when the preset trigger voltage points |A| and |B| are reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor.

[0037] In this embodiment, when the rising edge of the positive half-wave and the falling edge of the negative half-wave of the AC voltage reach the preset trigger voltage point |A|, and the falling edge of the positive half-wave and the rising edge of the negative half-wave of the AC voltage reach the preset trigger voltage point |B|, the second signal processing module 4 outputs the switch control signal sequentially. After the unidirectional pulsating voltage is obtained by rectifying the AC voltage, in each peak of the unidirectional pulsating voltage, when its rising edge reaches the preset trigger voltage point A, the second control signal is sent and the process ends; subsequently, when its falling edge reaches the preset trigger voltage point B, the second control signal is sent again and the process ends, repeating until the transmission is complete.

[0038] In practical use, the trigger voltage point |A| and the preset trigger voltage point |B| can be manually detected, and the voltage points on the rising and falling edges of the AC voltage can be selected and set manually as built-in parameters for specific lamps and other loads; or they can be set by the specific lamps and other loads themselves.

[0039] Specifically, when the rising edge and / or falling edge of the AC voltage reaches the preset trigger voltage points |A| and |B|, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor, and the first rectifier filter module is in a no-current state; the method for obtaining the preset trigger voltage points |A| and |B| is as follows: Step S51: Real-time detection of the loop current of the first rectifier and filter module 6, obtaining the time interval during which the current of the first rectifier and filter module 6 drops to zero current, and synchronously detecting and obtaining the absolute value of the instantaneous AC voltage value within this time interval, thereby determining the instantaneous voltage interval corresponding to the AC voltage when the first rectifier and filter module 6 is in a state of no current.

[0040] By selecting the instantaneous voltage range, the voltage value range at the rising and falling edges of the AC voltage when the first rectifier and filter module 6 is in a no-current state is confirmed, ensuring that the subsequent transmission of the second control signal is carried out when the first rectifier and filter module 6 is in a no-current state, thus guaranteeing the timing of the transmission of the second control signal.

[0041] Step S52: Preset a signal transmission voltage range and obtain the overlap range between the instantaneous voltage range and the signal transmission voltage range.

[0042] By setting a signal transmission interval, it is possible to avoid signal transmission failure when sending the second control signal at low voltage, as the receiver may not receive the signal due to excessively low voltage. It also prevents the transmission of the first control signal at high voltage from affecting AC power and generating significant interference that could disrupt the normal transmission of the second control signal. The selection of the overlap interval, based on the instantaneous voltage range, ensures that the second control signal is transmitted within a suitable voltage range, enabling stable transmission.

[0043] Two different voltage points are selected in the overlapping interval, respectively as preset trigger voltage point |A| and preset trigger voltage point |B|. The preset trigger voltage point |A| is selected as the upper limit voltage point in the overlapping interval, and the preset trigger voltage point |B| is selected as the lower limit voltage point in the overlapping interval.

[0044] By selecting the upper and lower voltage limits as preset trigger voltage points, it can be ensured that the second control signal has the longest signal transmission time within a suitable time interval, thereby improving signal transmission efficiency.

[0045] Step S6: After receiving the AC voltage from step S5, the second AC input terminal 5 outputs it to the first rectifier and filter module 6. The AC voltage is rectified and shaped to output a second square wave pulsating DC voltage. At this time, the waveform of the second square wave pulsating DC voltage carries the control information of the load 9.

[0046] At the same time, the unidirectional pulsating voltage obtained by rectifying the AC voltage can also be filtered by the first filter capacitor C6 to remove the voltage fluctuations and obtain the first DC power supply voltage that can be output to the load 9 to supply power, without affecting the specific power transmission.

[0047] Step S7: The first signal processing module 8 receives the second square wave pulsating DC voltage in sequence, and decodes and outputs control information according to the second square wave pulsating DC voltage to control the corresponding load 9 to switch the operating state.

[0048] The first signal processing module 8 decodes the pulse sequence on the second square wave pulsating DC voltage, thereby obtaining the control information of the load 9 carried by the second square wave pulsating DC voltage, and then controlling the corresponding load 9 to switch its operating state according to the control information.

[0049] In this embodiment, the load 9 is a lamp, and the control information consists of several control instructions. The control instructions consist of a data frame header, channel signals, and brightness values. The channel signals include, but are not limited to, any one or more of the following: R channel signals, G channel signals, B channel signals, and W channel signals.

[0050] After decoding the pulse sequence on the second square wave pulsating DC voltage, the first signal processing module 8 can sequentially decode the split control data for controlling several color channels in the lamp and output the control data for the lamp in sequence. Specifically, through the control command consisting of a data frame header, an R and / or G and / or B and / or W channel signal, and a brightness value, the first signal processing module 8 can quickly identify and control the lamp beads of the corresponding color channel in the lamp to emit light according to the brightness value.

[0051] The present invention provides a control signal transmission method that enables low-interference transmission of control data when the voltage portion is not used during the rectification and filtering process, i.e., the current-free region, and the preset trigger voltage point is reached at the rising and / or falling edge of the AC voltage. When the voltage portion is used during the rectification and filtering process, control data is not transmitted. Without adding additional power or signal transmission channels or carrier signals, signal transmission through power lines is achieved at low cost and without affecting power transmission.

[0052] refer to Figure 2 and Figure 4 As shown, the present invention also provides a control signal transmission system applicable to the control signal transmission method described above, comprising a transmitting end and at least one receiving end; the transmitting end includes a first AC input terminal 1, an AC output terminal 2, a high-speed switching module 3, and a second signal processing module 4; the first AC input terminal 1 is electrically connected to the AC output terminal 2 through the high-speed switching module 3; the second signal processing module 4 is electrically connected to the first AC input terminal 1 and the high-speed switching module 3 respectively; The receiving end includes a second AC input terminal 5, a first rectification and filtering module 6, a signal separation module 7, a first signal processing module 8, and at least one load 9; the second AC input terminal 5 is electrically connected to the first signal processing module 8 through the first rectification and filtering module 6; the signal separation module 7 is electrically connected to both the first rectification and filtering module 6 and the first signal processing module 8; and the load 9 is electrically connected to the first signal processing module 8.

[0053] The first rectifier and filter module 6 includes a first rectifier bridge and a first filter capacitor connected in parallel at the output terminal of the first rectifier bridge; The AC output terminal 2 is used to output an AC voltage; the first rectifier bridge is used to rectify the AC voltage to obtain a unidirectional pulsating voltage, and send it to the first filter capacitor C6 and the signal separation module 7 respectively; the first filter capacitor C6 is used to filter the received unidirectional pulsating voltage to obtain a first DC voltage to drive the load 9; the signal separation module 7 is used to shape the unidirectional pulsating voltage into a square wave pulsating DC voltage and output it; the first signal processing module 8 is used to control the operating state of the load 9 according to the received square wave pulsating DC voltage.

[0054] Specifically, the square wave pulsating DC voltage includes a first square wave pulsating DC voltage and a second square wave pulsating DC voltage.

[0055] The second signal processing module 4 is used to receive a first control signal and then read and generate a corresponding second control signal; wherein, the first control signal is used to control the operating state of the load 9; the second control signal includes a plurality of consecutive switching control signals.

[0056] When the second signal processing module 4 generates the second control signal, the high-speed switch module 3 remains on, the signal separation module 7 outputs the first square wave pulsating DC voltage, and the first signal processing module 8 controls the load 9 to maintain its original operating state according to the first square wave pulsating DC voltage. When the second signal processing module 4 generates the second control signal, and when the rising edge and / or falling edge of the AC voltage reaches the preset voltage point, the second signal processing module 4 is also used to output the switch control signal in sequence and control the high-speed switch module 3 to turn on and off in sequence, so that a number of gaps corresponding to the switch control signal are generated on the waveform of the AC voltage output at the AC output terminal 2; wherein, when the preset voltage point is reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor, so that the first rectifier filter module 6 is in a no-current state; The signal separation module 7 outputs a second square wave pulsating DC voltage, and the first signal processing module 8 obtains control information based on the second square wave pulsating DC voltage and switches the operating state of the corresponding load 8.

[0057] This control signal transmission system controls the switching on and off of the AC voltage output at specific time points, so that the control information of load 9 is transmitted along with the AC voltage, and is finally decoded to control the corresponding load 9. It features low cost, low interference and high quality transmission.

[0058] Specifically, refer to Figure 2 As shown, the high-speed switching module 3 includes a first N-MOS transistor Q1, a P-MOS transistor Q2, a first optocoupler U1, a second optocoupler U2, a third optocoupler U3, and a fourth optocoupler U4. In this embodiment, pin 1 (Anode) of the optocoupler refers to the positive terminal of the light-emitting diode (LED) within the optocoupler; pin 2 (Cathode) of the optocoupler refers to the negative terminal of the LED within the optocoupler; pin 3 (Emitter) of the optocoupler refers to the emitter of the phototransistor within the optocoupler; and pin 4 (Collector) of the optocoupler refers to the collector of the phototransistor within the optocoupler.

[0059] Both the first and second optocouplers have pin 1 connected to an external DC power supply. Pin 3 of the first optocoupler is connected to the source of the first N-MOS transistor, and the source of the first N-MOS transistor is connected to the first terminal of the first AC input terminal 1. Pin 4 of the first optocoupler is connected to the gate of the first N-MOS transistor and is also connected to pin 3 of the third optocoupler. Pin 3 of the second optocoupler is connected to the gate of the P-MOS transistor and is also connected to pin 4 of the fourth optocoupler. The drain of the P-MOS transistor is connected to the first terminal of the AC output terminal 2. The drain of the first N-MOS transistor is connected to the source of the P-MOS transistor, and pin 4 of the second optocoupler is connected to the source of the P-MOS transistor. The source and gate of the first N-MOS transistor are connected by a resistor R1, and the source and gate of the P-MOS transistor are connected by a resistor R2; pin 2 of the third and fourth optocouplers are both grounded; pin 4 of the third optocoupler is connected to the second terminal of the first AC input terminal 1 and to pin 3 of the fourth optocoupler, and pin 3 of the fourth optocoupler is connected to the second terminal of the first AC input terminal 1; a capacitor C1 is provided between pin 3 of the first optocoupler and pin 4 of the third optocoupler, and a capacitor C2 is provided between pin 4 of the second optocoupler and pin 3 of the fourth optocoupler; pin 2 of the first and second optocouplers and pin 1 of the third and fourth optocouplers are all connected to the second signal processing module 4.

[0060] When the switch control signal input to the second signal processing module 4 is at a low level, the high-speed switch module 3 is in the off state.

[0061] Specifically, at this time, pin 1 of both the first optocoupler U1 and the second optocoupler U2 is connected to a DC power supply, and pin 2 is pulled low by the low level of signal input terminal 3, resulting in no current flowing through them. The LEDs inside U1 and U2 do not emit light, and the phototransistors remain in the off state, equivalent to the switch being open. Since the active drive provided by the first optocoupler U1 and the second optocoupler U2 has disappeared, the gate charge of the first N-MOS transistor Q1 is quickly released through resistor R1, and the gate charge of the P-MOS transistor Q2 is quickly released through resistor R2, thereby pulling the gate voltages of the first N-MOS transistor Q1 and the P-MOS transistor Q2 down to 0V, ensuring that both MOS transistors are stably in the off state. Because pin 1 of both the third optocoupler U3 and the fourth optocoupler U4 receives a low-level switch control signal, the LEDs inside the third optocoupler U3 and the fourth optocoupler U4 do not emit light, and the phototransistors remain in the off state, cutting off any unexpected gate drive paths generated through them, further ensuring the reliability of the turn-off. At this time, the voltage change at the first AC input terminal 1 cannot affect the gates of Q1 and Q2 through U3 / U4. The high-speed switching module 3 is then disconnected.

[0062] When the switch control signal input to the second signal processing module 4 is at a high level, the high-speed switch module 3 is in a stable conducting state.

[0063] Specifically, when the first terminal of AC input 1 is positive and the second terminal is negative, pin 4 of the third optocoupler U3 is connected to the second terminal of AC input 1, and the third optocoupler U3 is turned on. Simultaneously, the first optocoupler U1 is turned on, and capacitor C1 charges and stores energy through the first optocoupler U1 and the third optocoupler U3, providing a positive voltage relative to the source of N-MOS transistor Q1's gate and pin 4 of the first optocoupler U1, thus forming an effective turn-on voltage and fully turning on N-MOS transistor Q1. At the same time, pin 3 of the fourth optocoupler U4 is also connected to the second terminal of AC input 1, and the fourth optocoupler U4 is turned on. The second optocoupler U2 is turned on, and capacitor C2 charges and stores energy through the second optocoupler U2 and the fourth optocoupler U4, pulling the gate voltage of P-MOS transistor Q2 down to near its source voltage, thus forming an effective negative turn-on voltage between the gate and source of P-MOS transistor Q2, and therefore P-MOS transistor Q2 is also fully turned on. At this time, the current can flow sequentially through the channels of the first N-MOS transistor Q1 and the P-MOS transistor Q2 to reach the AC output terminal 2.

[0064] When the first terminal of AC input 1 is negative and the second terminal is positive, pin 3 of the fourth optocoupler U4 is connected to the second terminal of the AC input, and the fourth optocoupler U4 is turned on. The second optocoupler U2 is turned on, and capacitor C2 charges and stores energy through the second optocoupler U2 and the fourth optocoupler U4, providing a negative voltage relative to the source of P-MOS transistor Q2 at the gate and pin 3 of the second optocoupler U2, thus forming an effective turn-on voltage and making P-MOS transistor Q2 fully turn on. At the same time, pin 4 of the third optocoupler U3 is connected to the second terminal of AC input 1, and the third optocoupler U3 is turned on. The first optocoupler U1 is turned on, and capacitor C1 charges and stores energy through the first optocoupler U1 and the third optocoupler U3, pulling the gate voltage of the first N-MOS transistor Q1 higher than its source voltage, so that the gate of N-MOS transistor Q1 forms an effective positive turn-on voltage relative to its source, and therefore the first N-MOS transistor Q1 is also fully turned on. At this time, the current can flow sequentially through the channels of P-MOS transistor Q2 and the first N-MOS transistor Q1 to reach the AC output terminal 2.

[0065] refer to Figure 4As shown, the signal separation module 7 includes resistors R8, R9, and R10, diodes D2, D3, and D4; resistor R8 is connected in parallel between the V+ and V- pins of the first rectifier bridge; one end of resistor R9 is connected to one end of resistor R8 and the anode of diode D2, and the other end is connected to the cathode of diode D3; the cathode of diode D2 is connected to the first end of the first filter capacitor; the first end of the first filter capacitor is also electrically connected to the second signal processing module 8, and the second end is connected to the V- pin of the first rectifier bridge and grounded; the anode of diode D3 is connected to the first signal processing module 8, and it is grounded through a resistor R10; a diode D4 is connected in parallel across resistor R10.

[0066] In this embodiment, the first rectifier and filter module 6 further includes a second linear regulator; the first end of the first filter capacitor is connected to the VDD pin of the second linear regulator, and the second end is connected to the GND pin of the second linear regulator. The OUT pin of the second linear regulator is connected to the first signal processing module 8. The VDD pin serves as the input terminal of the second linear regulator, receiving the DC voltage after rectification and filtering; the GND pin is the ground terminal, providing a stable reference potential. The second linear regulator regulates the voltage input to the VDD pin, and through the adjustment of its internal circuitry, provides the regulated stable DC voltage to the first signal processing module 8, ensuring that the module operates in a stable power supply environment.

[0067] In some embodiments, the transmitting end further includes a second rectification and filtering module 10, and before step S1, there is a step S102, in which the AC voltage output from the first AC input terminal 1 is rectified and filtered by the second rectification and filtering module 10 to obtain a DC voltage to drive the second signal processing module 4.

[0068] Specifically, the second rectifier and filter module 10 includes a second rectifier bridge and a second filter capacitor C5; the AC port 1 and AC port 2 of the second rectifier bridge are respectively connected to the first end and the second end of the first AC input terminal 1; the second filter capacitor C5 is connected in parallel between the V+ pin and the V- pin of the second rectifier bridge, and the first end of the second filter capacitor C5 is connected to the VDD pin of a first linear regulator, and the second end is grounded; the V- pin of the second rectifier bridge is connected to the GND pin of the first linear regulator, and the OUT of the first linear regulator is connected to the second signal processing module 4.

[0069] The VDD pin serves as the input terminal of the first linear regulator, receiving the DC voltage after rectification and filtering. The GND pin is the ground terminal, providing a stable reference potential. The first linear regulator regulates the voltage input to the VDD pin, and through the adjustment of the internal circuitry, provides the regulated DC voltage to the second signal processing module 4, ensuring that the module operates in a stable power supply environment.

[0070] The transmitting end also includes a voltage detection module 11 for detecting the magnitude of AC voltage. The voltage detection module 11 includes resistors R1, R2, and R3 and a diode D1. Resistor R1 is connected in parallel between the V+ and V- pins of the second rectifier bridge. One end of resistor R2 is connected to one end of resistor R1 and the anode of diode D1, and the other end is connected to resistor R4 and then to the second signal processing module 4. The other end of resistor R4 is grounded. The cathode of diode D1 is connected to the first end of the first filter capacitor.

[0071] By setting up the voltage detection module 11, signal transmission failure can be avoided when the first control signal is sent at low voltage, as the receiving end cannot receive the signal due to the low voltage; it can also be avoided when the second control signal is sent at high voltage, as it affects the AC power and generates a large interference signal that affects the normal transmission of the second control signal. Example 2

[0072] refer to Figure 3As shown, compared with Embodiment 1, Embodiment 2 differs in that: the high-speed switching module 3 includes a second N-MOS transistor, a third N-MOS transistor, a fifth optocoupler, a sixth optocoupler, a seventh optocoupler, and an eighth optocoupler; pin 1 of the fifth and eighth optocouplers is externally connected to a DC power supply; pin 3 of the fifth optocoupler is connected to the source of the second N-MOS transistor and is connected to pin 4 of the seventh optocoupler through a capacitor C3; the source of the second N-MOS transistor is connected to the first terminal of the first AC input terminal; pin 4 of the fifth optocoupler is connected to the gate of the second N-MOS transistor and is connected to pin 3 of the seventh optocoupler; the source and gate of the second N-MOS transistor are connected through a resistor R3; pin 3 of the sixth optocoupler is connected to the eighth optocoupler. The fourth pin of the sixth optocoupler is connected to the gate of the third N-MOS transistor; the fourth pin of the sixth optocoupler is connected to the third pin of the eighth optocoupler through a capacitor C4, and is also connected to the first terminal of the AC output terminal; the fourth pin of the seventh optocoupler is also connected to the second terminal of the first AC input terminal; the fourth pin of the eighth optocoupler is connected to the gate of the third N-MOS transistor, and the drain of the third N-MOS transistor is connected to the first terminal of the AC output terminal; the source and gate of the third N-MOS transistor are connected through a resistor R4; the second pin of the sixth and seventh optocouplers is grounded; the second pin of the fifth and eighth optocouplers and the first pin of the sixth and fifth / sixth optocouplers are all connected to the second signal processing module 4.

[0073] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control signal transmission method, characterized in that, include: Step S1: The first AC input terminal and the corresponding AC output terminal are continuously connected, so that the AC output terminal outputs an AC voltage, which is then received by a second AC input terminal and output to a first rectifier and filter module; wherein, the first rectifier and filter module includes a first rectifier bridge and a first filter capacitor. Step S2: The AC voltage is rectified by the first rectifier bridge to obtain a unidirectional pulsating voltage and then output in two paths. One path is directly rectified into a first square wave pulsating DC voltage and output to a first signal processing module; the other path is filtered by the first filter capacitor to obtain a first DC voltage to drive the corresponding load. Step S3: The first signal processing module decodes the unobtained control information based on the received first square wave pulsating DC voltage and maintains the original operating state of the load. Step S4: Output a first control signal for controlling the operating status of the load, and receive the first control signal through a second signal processing module to generate a corresponding second control signal; wherein, the second control signal includes a plurality of consecutive switching control signals; Step S5: When the rising edge and / or falling edge of the AC voltage reaches the preset voltage point, the second signal processing module outputs the switch control signal sequentially, controlling the first AC input terminal and the corresponding AC output terminal to be switched on and off sequentially, thereby generating several gaps on the waveform of the AC voltage output from the AC output terminal that correspond one-to-one with the switch control signal; wherein, when the preset voltage point is reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor. Step S6: After receiving the AC voltage from step S5, the second AC input terminal outputs it to the first rectifier and filter module, which rectifies and shapes the AC voltage to output a second square wave pulsating DC voltage. Step S7: The first signal processing module receives the second square wave pulsating DC voltage in sequence, and decodes and outputs control information according to the second square wave pulsating DC voltage to control the corresponding load to switch operating states.

2. The control signal transmission method according to claim 1, characterized in that, The preset trigger voltage points include preset trigger voltage point |A| and preset trigger voltage point |B|. When the rising edge of the positive half-wave and / or the falling edge of the negative half-wave of the AC voltage reaches preset trigger voltage point |A|, and / or the falling edge of the positive half-wave and / or the rising edge of the negative half-wave of the AC voltage reaches preset trigger voltage point |B|, the second signal processing module outputs the switch control signal sequentially. When the preset trigger voltage points |A| and |B| are reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor.

3. The control signal transmission method according to claim 2, characterized in that, When the rising edge and / or falling edge of the AC voltage reaches the preset trigger voltage points |A| and |B|, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor, and the first rectifier filter module is in a no-current state; the method for obtaining the preset trigger voltage points |A| and |B| is as follows: Step S51: Real-time detection of the loop current of the first rectifier and filter module, obtaining the time interval during which the current of the first rectifier and filter module drops to zero current, and synchronously detecting and obtaining the absolute value of the instantaneous voltage value of the AC voltage within this time interval, thereby determining the instantaneous voltage interval corresponding to the AC voltage when the first rectifier and filter module is in a state of no current. Step S52: Preset a signal transmission voltage range and obtain the overlap range between the instantaneous voltage range and the signal transmission voltage range; Step S53: Select two different voltage points in the overlapping interval, respectively as preset trigger voltage point |A| and preset trigger voltage point |B|, wherein preset trigger voltage point |A| is selected as the upper limit voltage point in the overlapping interval, and preset trigger voltage point |B| is selected as the lower limit voltage point in the overlapping interval.

4. The control signal transmission method according to claim 1, characterized in that, The several consecutive switch control signals are divided into N groups. Whenever the rising edge and / or falling edge of the AC voltage reaches the preset voltage point, the second signal processing module outputs a group of switch control signals in sequence until the switch control signals are sent. The last switch control signal in each group is used to control the connection between the first AC input terminal and the corresponding AC output terminal.

5. The control signal transmission method according to claim 1, characterized in that, The load is a lamp, and the control information consists of several control instructions. Each control instruction consists of a data frame header, channel signals, and brightness values. The channel signals include, but are not limited to, any one or more of the following: R channel signals, G channel signals, B channel signals, and W channel signals.

6. A control signal transmission system, characterized in that, It includes a transmitter and at least one receiver; the transmitter includes a first AC input, an AC output, a high-speed switching module, and a second signal processing module; the first AC input is electrically connected to the AC output through the high-speed switching module; the second signal processing module is electrically connected to the first AC input and the high-speed switching module respectively. The receiving end includes a second AC input terminal, a first rectification and filtering module, a signal separation module, a first signal processing module, and at least one load; the second AC input terminal is electrically connected to the first signal processing module through the first rectification and filtering module; the signal separation module is electrically connected to both the first rectification and filtering module and the first signal processing module; the load is electrically connected to the first signal processing module; the first rectification and filtering module includes a first rectifier bridge and a first filter capacitor connected in parallel at the output terminal of the first rectifier bridge; The AC output terminal is used to output an AC voltage; the first rectifier bridge is used to rectify the AC voltage to obtain a unidirectional pulsating voltage, and then send it to the first filter capacitor and the signal separation module respectively; the first filter capacitor is used to filter the received unidirectional pulsating voltage to obtain a first DC voltage to drive the load; the signal separation module is used to shape the unidirectional pulsating voltage into a square wave pulsating DC voltage and output it; the first signal processing module is used to control the operating state of the load according to the received square wave pulsating DC voltage; the square wave pulsating DC voltage includes a first square wave pulsating DC voltage and a second square wave pulsating DC voltage; The second signal processing module is used to receive a first control signal and then read and generate a corresponding second control signal; wherein, the first control signal is used to control the operating state of the load; and the second control signal includes a plurality of consecutive switching control signals. When the second signal processing module generates the second control signal, the high-speed switching module remains on, the signal separation module outputs a first square wave pulsating DC voltage, and the first signal processing module controls the load to maintain its original operating state according to the first square wave pulsating DC voltage. When the second signal processing module generates the second control signal, and when the rising edge and / or falling edge of the AC voltage reaches the preset voltage point, the second signal processing module is also used to output the switch control signal in sequence and control the high-speed switch module to turn on and off in sequence, so that a number of gaps corresponding to the switch control signal are generated on the waveform of the AC voltage output at the AC output terminal; wherein, when the preset voltage point is reached, the instantaneous voltage of the AC voltage is less than the voltage of the first filter capacitor. The signal separation module outputs a second square wave pulsating DC voltage, and the first signal processing module decodes the second square wave pulsating DC voltage to obtain control information and switches the operating state of the corresponding load.

7. A control signal transmission system according to claim 6, characterized in that, The transmitting end further includes a second rectification and filtering module and a voltage detection module for detecting the magnitude of AC voltage. The second rectification and filtering module includes a second rectifier bridge and a second filter capacitor. The AC port 1 and AC port 2 of the second rectifier bridge are respectively connected to the first end and the second end of the first AC input terminal. The second filter capacitor is connected in parallel between the V+ pin and the V- pin of the second rectifier bridge, and the first end of the second filter capacitor is connected to the VDD pin of a first linear regulator, and the second end is grounded. The V- pin of the second rectifier bridge is connected to the GND pin of the first linear regulator, and the OUT pin of the first linear regulator is connected to the second signal processing module. The voltage detection module includes resistors R1, R2, and R3, and a diode D1. Resistor R1 is connected in parallel between the V+ and V- pins of the second rectifier bridge. One end of resistor R2 is connected to one end of resistor R1 and the anode of diode D1, and the other end is connected to resistor R3 and then to the second signal processing module. The other end of resistor R3 is grounded. The cathode of diode D1 is connected to the first end of the first filter capacitor.

8. A control signal transmission system according to claim 6, characterized in that, The high-speed switching module includes a first N-MOS transistor, a P-MOS transistor, a first optocoupler, a second optocoupler, a third optocoupler, and a fourth optocoupler; The first optocoupler and the second optocoupler are both connected to an external DC power supply at pin 1. The first optocoupler is connected to the source of the first N-MOS transistor, and the source of the first N-MOS transistor is connected to the first end of the first AC input terminal. The first optocoupler is connected to the gate of the first N-MOS transistor and is connected to the third optocoupler at pin 3. The third pin of the second optocoupler is connected to the gate of the P-MOS transistor and to the fourth pin of the fourth optocoupler; the drain of the P-MOS transistor is connected to the first terminal of the AC output terminal. The drain of the first N-MOS transistor is connected to the source of the P-MOS transistor, and pin 4 of the second optocoupler is connected to the source of the P-MOS transistor; the source and gate of the first N-MOS transistor are connected by a resistor R4, and the source and gate of the P-MOS transistor are connected by a resistor R5. Both pins 2 of the third and fourth optocouplers are grounded; pin 4 of the third optocoupler is connected to the second end of the first AC input terminal and to pin 3 of the fourth optocoupler, and pin 3 of the fourth optocoupler is connected to the second end of the first AC input terminal; a capacitor C1 is provided between pin 3 of the first optocoupler and pin 4 of the third optocoupler, and a capacitor C2 is provided between pin 4 of the second optocoupler and pin 3 of the fourth optocoupler. Pin 2 of the first optocoupler and the second optocoupler, and pin 1 of the third optocoupler and the fourth optocoupler are all connected to the second signal processing module.

9. A control signal transmission system according to claim 6, characterized in that, The high-speed switching module includes a second N-MOS transistor, a third N-MOS transistor, a fifth optocoupler, a sixth optocoupler, a seventh optocoupler, and an eighth optocoupler; Pin 1 of both the fifth and eighth optocouplers is connected to an external DC power supply. Pin 3 of the fifth optocoupler is connected to the source of the second N-MOS transistor and is connected to pin 4 of the seventh optocoupler through a capacitor C3. The source of the second N-MOS transistor is connected to the first terminal of the first AC input terminal. Pin 4 of the fifth optocoupler is connected to the gate of the second N-MOS transistor and is connected to pin 3 of the seventh optocoupler. The source and gate of the second N-MOS transistor are connected through a resistor R6. The 3rd pin of the sixth optocoupler is connected to the 4th pin of the eighth optocoupler, and the 4th pin of the eighth optocoupler is connected to the gate of the third N-MOS transistor; the 4th pin of the sixth optocoupler is connected to the 3rd pin of the eighth optocoupler through a capacitor C4, and is also connected to the first terminal of the AC output. The fourth pin of the seventh optocoupler is also connected to the second terminal of the first AC input terminal; the fourth pin of the eighth optocoupler is connected to the gate of the third N-MOS transistor, and the drain of the third N-MOS transistor is connected to the first terminal of the AC output terminal; the source and gate of the third N-MOS transistor are connected by a resistor R7. Pin 2 of the sixth and seventh optocouplers is grounded; pin 2 of the fifth and eighth optocouplers and pin 1 of the sixth and fifth-sixth optocouplers are all connected to the second signal processing module.

10. A control signal transmission system according to claim 6, characterized in that, The signal separation module includes resistors R8, R9, and R10, diodes D2, D3, and D4. Resistor R8 is connected in parallel between the V+ and V- pins of the first rectifier bridge. One end of resistor R9 is connected to one end of resistor R8 and the anode of diode D2, and the other end is connected to the cathode of diode D3. The cathode of diode D2 is connected to the first end of the first filter capacitor. The first end of the first filter capacitor is also electrically connected to the second signal processing module, and the second end is connected to the V- pin of the first rectifier bridge and grounded. The anode of diode D3 is connected to the first signal processing module and grounded through resistor R10. A diode D4 is connected in parallel across resistor R10.

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