Dimming control system and equipment

Abstract

The embodiment of the invention discloses a dimming control system and equipment. A main loop module transmits electric energy in a power grid system to a driving device; the PLC communication module receives a driving turn-off signal issued by a power grid system and sends a relay turn-off signal, or receives a driving dimming signal issued by the power grid system and sends a PWM pulse signal; the relay control module receives the relay turn-off signal and sends a turn-off signal; the relay unit receives the turn-off signal to turn off the electric energy of the driving device, so that the power grid system issues the turn-off signal to turn off the driving device; the dimming module receives the PWM pulse signal and sends a DC dimming signal and a PWM dimming signal; the DC dimming signal and the PWM dimming signal adjust the output current of the driving device to realize dimming, so that the structure and the control flow of the control system are simplified, and the dimming operation becomes simpler.

Description

[Technical Field]

[0001] This invention relates to the field of LED driving and protection technology, and in particular to a dimming control system and device. [Background Technology]

[0002] In recent years, with the continuous development of broadband power line carrier technology and social needs, the development and application of power line carrier communication technology have also flourished. Data transmission can be carried out as long as there are power lines, without the need to rebuild a network, highlighting the unique advantages of power line carrier communication. Compared to wireless communication, it not only significantly reduces the cost of building a system network and offers better transmission speeds, but it can also effectively handle areas where wireless communication is inaccessible. For locations that have already established networks for ordinary lighting fixtures, there is an urgent need to build an intelligent lighting control network to keep up with technological advancements. However, existing intelligent lighting control networks are complex in structure, requiring not only the control terminal to issue light control commands but also further debugging of the intelligent lighting control system, making operation complicated. [Summary of the Invention]

[0003] In view of this, the present invention provides a dimming control system and device.

[0004] The technical solution of the first embodiment of the present invention is as follows: a dimming control system, the system comprising: a main circuit module, a PLC communication module, a relay control module, and a dimming module, wherein a relay unit is provided in the main circuit module; the input terminals of the main circuit module and the PLC communication module are both connected to the power grid system; the output terminal of the relay unit of the main circuit module is connected to a driving device; the output terminal of the PLC communication module is connected to the input terminals of the relay control module and the dimming module; the output terminal of the relay control module is connected to the input terminal of the relay unit; and the output terminal of the dimming module is connected to the driving device; the main circuit module is used to transmit electrical energy from the power grid system to the dimming module. The drive device is described above; the PLC communication module is used to receive a drive shutdown signal sent by the power grid system and send a relay disconnect signal to the relay control module, or receive a drive dimming signal sent by the power grid system and send a PWM pulse signal to the dimming module; the relay control module is used to receive the relay disconnect signal and send a shutdown signal to the relay unit; the relay unit is used to receive the shutdown signal and shut off the power of the drive device; the dimming module is used to receive the PWM pulse signal and send a DC dimming signal and a PWM dimming signal to the drive device for dimming; the DC dimming signal and the PWM dimming signal are used to adjust the output current of the drive device.

[0005] Preferably, the main circuit module further includes a lightning protection unit, the input terminal of which is connected to the power grid system, and the output terminal of which is connected to the relay unit; the lightning protection unit is used to suppress lightning surge voltage in the main circuit module.

[0006] Preferably, the relay unit is a surge current limiting unit; the surge current limiting unit is used to suppress surge current in the main circuit module.

[0007] Preferably, the main circuit module further includes an EMI unit, the input of which is connected to the output of the lightning protection unit, and the output of which is connected to the input of the surge current limiting unit; the EMI unit is used to filter out interference signals in the main circuit module and prevent electromagnetic interference.

[0008] Preferably, the system further includes a power metering module, a sampling resistor is provided in the main circuit module, and the input terminal of the power metering module is connected to the main circuit module; the power metering module is used to obtain the power consumption and temperature parameters in the main circuit module through the sampling resistor.

[0009] Preferably, the main circuit module includes a fuse, a first varistor, a second varistor, a third varistor, a fourth varistor, a fifth varistor, a gas discharge tube, a first Y capacitor, a second Y capacitor, a first differential mode inductor, a second differential mode inductor, an X capacitor, a common mode inductor, a sampling resistor, a high-power resistor, a first relay, and a second relay; one end of the fuse is connected to the live wire of the power grid system, one end of the first varistor, one end of the third varistor, one end of the first Y capacitor, and one end of the second differential mode inductor are all connected to the neutral wire of the power grid system, the other end of the fuse is connected to the other end of the first varistor, one end of the fourth varistor, one end of the second Y capacitor, and one end of the first differential mode inductor, respectively, and the other end of the fourth varistor is connected to the other end of the third varistor and one end of the gas discharge tube, respectively. The other end of the gas discharge tube is connected to the other end of the second Y capacitor and the other end of the first Y capacitor and grounded. The other end of the first differential mode inductor is connected to one end of the X capacitor, one end of the second varistor, and the second pin of the common mode inductor. The other end of the second differential mode inductor is connected to the other end of the X capacitor, the other end of the second varistor, and the third pin of the common mode inductor. The first pin of the common mode inductor is connected to one end of the sampling resistor and one end of the fifth varistor. The fourth pin of the common mode inductor is connected to the other end of the fifth varistor and the input terminal of the first relay. The other end of the sampling resistor is connected to the input terminal of the second relay and one end of the high-power resistor. The other end of the high-power resistor, the output terminal of the first relay, and the output terminal of the second relay are all connected to the driving device.

[0010] Preferably, the relay control module includes a first relay control circuit and a second relay control circuit; the first relay control circuit is used to control the on and off of the first relay, and the second relay control circuit is used to control the on and off of the second relay.

[0011] Preferably, the first relay control circuit includes a first current-limiting resistor, a first protective resistor, a second protective resistor, a third protective resistor, a first filter capacitor, a first diode, a first transistor, and a second diode. One end of the first current-limiting resistor is connected to a power supply, and the other end of the first current-limiting resistor is connected to one end of the first filter capacitor and pin 3 of the first relay. The other end of the first filter capacitor is connected to a power supply, the emitter of the first transistor, the emitter of the second diode, and one end of the first protective resistor. The anode of the first diode is connected to pin 3 of the first relay, the cathode of the first diode is connected to pin 4 of the first relay, the collector of the first transistor is connected to pin 4 of the first relay, the base of the first transistor is connected to one end of the second protective resistor and the collector of the second diode, the base of the second diode and the other end of the first protective resistor are both connected to one end of the third protective resistor, the other end of the third protective resistor is connected to the output terminal of the PLC communication module, and the other end of the second protective resistor is connected to a power supply.

[0012] Preferably, the second relay control circuit includes a second current-limiting resistor, a third current-limiting resistor, a fourth protection resistor, a fifth protection resistor, a sixth protection resistor, a second diode, a second filter capacitor, a third filter capacitor, a third transistor, a fourth transistor, and a fifth transistor; one end of the second current-limiting resistor is connected to the power supply, and the other end of the second current-limiting resistor is connected to the third pin of the second relay, one end of the second filter capacitor, and the cathode of the second diode; the other end of the second filter capacitor is connected to the power supply, the emitter of the third transistor, one end of the third filter capacitor, one end of the sixth protection resistor, and the collector of the fifth transistor; the anode of the second diode is connected to... The collector of the third transistor is connected to the fourth pin of the second relay. The base of the third transistor is connected to one end of the third current-limiting resistor. The other end of the third current-limiting resistor is connected to the other end of the third filter capacitor, the other end of the sixth protection resistor, and one end of the collector of the fourth transistor. The emitter of the fourth transistor is connected to one end of the fourth protection resistor. The other end of the fourth protection resistor is connected to the power supply. The base of the fourth transistor is connected to the emitter of the fifth transistor. The base of the fifth transistor is connected to one end of the fifth protection resistor. The other end of the fifth protection resistor is connected to the output terminal of the PLC communication module.

[0013] The technical solution of the second embodiment of the present invention is: a dimming control device, including a dimming control system as described in any one of the first embodiments of this application.

[0014] Implementing the embodiments of the present invention will have the following beneficial effects:

[0015] In this invention, the main circuit module transmits electrical energy from the power grid system to the drive device; the PLC communication module receives the drive shutdown signal sent by the power grid system and sends a relay disconnect signal, or receives the drive dimming signal sent by the power grid system and sends a PWM pulse signal; the relay control module receives the relay disconnect signal and sends a shutdown signal; the relay unit receives the shutdown signal and shuts off the power to the drive device, so that the drive device can be shut off simply by sending a shutdown signal from the power grid system; the dimming module receives the PWM pulse signal and sends a DC dimming signal and a PWM dimming signal; the DC dimming signal and the PWM dimming signal adjust the output current of the drive device to achieve dimming, thereby simplifying the structure and process of the control system and making the dimming operation simpler. [Attached Image Description]

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the dimming control system according to the first embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the dimming control system according to the second embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the dimming control system according to the third embodiment of this application;

[0020] Figure 4 This is the circuit diagram of the power metering module;

[0021] Figure 5 A schematic diagram of the power supply circuit for the power metering module;

[0022] Figure 6 The circuit diagram of the main circuit module;

[0023] Figure 7 This is the circuit diagram for the PLC signal transmission module.

[0024] Figure 8 This is the circuit diagram of the PLC module;

[0025] Figure 9 Circuit diagram for AC-AD power supply module;

[0026] Figure 10 This is the circuit diagram of the dimming module;

[0027] Figure 11 This is the circuit diagram of the first relay control circuit;

[0028] Figure 12 This is the circuit diagram for the second relay control circuit;

[0029] Figure 13 This is a structural diagram of the dimming control system;

[0030] Among them, 101 is the main circuit module; 102 is the PLC communication module; 103 is the relay control module; 104 is the dimming module; 201 is the relay unit; 202 is the lightning protection unit; 203 is the EMI unit; 301 is the power metering module; 302 is the power metering module power supply circuit; 401 is the PLC signal transmission module; 402 is the PLC module; and 403 is the AC-AD power supply module.

Detailed Implementation Methods

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] The terms "first," "second," etc., used in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or modules is not limited to the listed steps or modules, but may optionally include steps or modules not listed, or may optionally include other steps or modules inherent to such processes, methods, products, or apparatus.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] Please see Figure 1This is a schematic diagram of a dimming control system according to the first embodiment of this application, which simplifies dimming operation. The system includes: a main circuit module 101, a PLC communication module 102, a relay control module 103, and a dimming module 104. A relay unit 201 is provided in the main circuit module 101. The input terminals of the main circuit module 101 and the PLC communication module 102 are both connected to the power grid system. The output terminal of the relay unit 201 in the main circuit module 101 is connected to a drive device. The output terminal of the PLC communication module 102 is connected to the input terminals of the relay control module 103 and the dimming module 104. The output terminal of the relay control module 103 is connected to the input terminal of the relay unit 201. The output terminal of the dimming module 104 is connected to the drive device. The loop module 101 is used to transmit electrical energy from the power grid system to the drive device; the PLC communication module 102 is used to receive the drive shutdown signal sent by the power grid system and send a relay disconnect signal to the relay control module 103, or receive the drive dimming signal sent by the power grid system and send a PWM pulse signal to the dimming module 104; the relay control module 103 is used to receive the relay disconnect signal and send a shutdown signal to the relay unit 201; the relay unit 201 is used to receive the shutdown signal to shut off the power to the drive device; the dimming module 104 is used to receive the PWM pulse signal and send a DC dimming signal and a PWM dimming signal to the drive device for dimming; the DC dimming signal and the PWM dimming signal are used to adjust the output current of the drive device.

[0035] Specifically, after the main circuit module is connected to the mains power grid, it directly outputs mains power to the lighting driver without conversion. The relay unit controls the on / off state of the main circuit module through the relay control module. The on / off control signal is sent by the PLC communication module and converted by the relay control module to realize the relay switching. To realize the PLC communication dimming function, a dimming signal conversion output, i.e., a dimming module, needs to be built to convert the dimming signal into a 10V PWM pulse signal and a 0-10V DC dimming signal and output them to adjust the output current of the driver, thereby realizing dimming.

[0036] In this embodiment, the main circuit module transmits electrical energy from the power grid to the drive device; the PLC communication module receives the drive shutdown signal from the power grid and sends a relay disconnect signal, or receives the drive dimming signal from the power grid and sends a PWM pulse signal; the relay control module receives the relay disconnect signal and sends a shutdown signal; the relay unit receives the shutdown signal and shuts off the power to the drive device, so that the drive device can be shut off simply by sending a shutdown signal from the power grid; the dimming module receives the PWM pulse signal and sends a DC dimming signal and a PWM dimming signal; the DC dimming signal and the PWM dimming signal adjust the output current of the drive device to achieve dimming, thereby simplifying the structure and process of the control system and making the dimming operation simpler.

[0037] In a specific embodiment, please refer to Figure 2 The main circuit module also includes a surge protection unit 202. The input terminal of the surge protection unit is connected to the power grid system, and the output terminal is connected to the relay unit. The surge protection unit is used to suppress lightning surge voltage in the main circuit module. A lightning surge protection system is constructed using varistors, gas discharge tubes, and thermistors. Specifically, differential mode surge voltage is suppressed by three varistors between the L and N terminals. These three varistors are connected at different positions before and after the main circuit, suppressing the lightning surge voltage layer by layer to a certain level. Common mode surge voltage is suppressed by the varistor between the L / N terminal and the ground wire, and by the gas discharge tube, suppressing the lightning surge voltage to a certain level. Regardless of whether the surge protection level is 4KV / 6KV or 6KV / 10KV, the structure is basically the same; the difference lies in the selection of components.

[0038] In a specific embodiment, please refer to Figure 2 Relay unit 201 is a surge current limiting unit; the surge current limiting unit is used to suppress surge current in the main circuit module. The surge current limiting unit in this application mainly achieves current limiting through a high-power resistor in conjunction with relays (K1, K2). The high-power resistor (RS2) has strong heat dissipation capability and a resistance value of R; relays K1 and K2 are both normally open. When multiple loads with a 600W load are simultaneously connected to the mains power supply at terminals W1(L)-W2(N) of the main circuit, the relay control circuit will output drive voltages at both terminals K2-3 and K2-4, and K1-3 and K1-4, but the timing of the output drive voltages will be different, thus the closing times of relays K1 and K2 will have a sequence. Relay K1 will close before relay K2, and the interval tK is adjusted by the relay control circuit. Once relay K1 closes, it will work with the high-power resistor (RS2) to energize the main circuit. Since relay K2 is not closed, the resistance value of the main circuit must be greater than R at this time, therefore, according to theoretical calculations:

[0039]

[0040] It can be seen that the instantaneous surge current of the main circuit will be limited to a certain range, thus being suppressed. Because the main circuit carries a 600W load and can connect multiple loads simultaneously, and each load generates a large surge current upon startup, without a surge current suppression circuit design, the surge currents of the multiple connected loads would be superimposed on the main circuit, resulting in an extremely large surge current and posing a significant danger to the circuit. With the surge current suppression circuit design, regardless of how many loads are simultaneously connected to the W1(L)-W2(N) terminals of the main circuit, the surge current can be effectively suppressed. And after t... K After a period of time, the main circuit current will gradually level off. At this time, relay K2 will close. Since the on-resistance of relay K2 after it closes is much smaller than the resistance of the high-power resistor (RS2), the current in the main circuit will pass through relay K2 instead of the high-power resistor (RS2), thus avoiding power consumption and unnecessary heat generation.

[0041] In a specific embodiment, please refer to Figure 2 The main circuit module also includes an EMI unit 203. The input terminal of the EMI unit is connected to the output terminal of the surge protection unit, and the output terminal of the EMI unit is connected to the input terminal of the surge current limiting unit. The EMI unit is used to filter out interference signals in the main circuit module and prevent electromagnetic interference. The EMI unit is an electromagnetic compatibility circuit, in which a common-mode inductor and an X capacitor CX1 are combined to build a common-mode interference suppression circuit, and a differential-mode inductor and a Y capacitor are combined to build a differential-mode interference suppression circuit. These two suppression circuits filter out various interference signals mixed in by the power grid and also prevent the circuit itself from causing electromagnetic interference to the power grid.

[0042] In a specific embodiment, please refer to Figure 3 The system also includes a power metering module 301, the circuit diagram of which is shown below. Figure 4 As shown, a sampling resistor is set in the main circuit module, and the input terminal of the power metering module is connected to the main circuit module. The power metering module is used to obtain the power consumption and temperature parameters in the main circuit module through the sampling resistor. The power metering module is used to read the power consumption and temperature parameters of the main circuit and feed them back to the PLC communication module. It uses the BL0940 chip as the main chip to build the peripheral circuit. The dimming control system also includes a power supply circuit 302 for the power metering module. The power metering module is powered by the VCC1 voltage of the power supply circuit. The structural diagram of the power supply circuit for the power metering module is shown below. Figure 5 As shown, the power supply circuit of the power metering module is built using a U3 chip (PN8015). It draws AC power from the AC(N) and AC(L) of the main circuit, and after rectification, filtering and voltage reduction smoothing, outputs a stable VCC1 voltage to power the power metering.

[0043] In a specific embodiment, please refer to Figure 6 The main circuit module includes a fuse F1, a first varistor RV1, a second varistor RV2, a third varistor RV3, a fourth varistor RV4, a fifth varistor RV5, a gas discharge tube GT1, a first Y capacitor CY2, a second Y capacitor CY3, a first differential mode inductor L1, a second differential mode inductor L2, an X capacitor CX1, a common mode inductor RL1, a sampling resistor RS1, a high-power resistor RS2, a first relay K1, and a second relay K2. One end of the fuse F1 is connected to the live wire of the power grid system. One end of the first varistor RV1, one end of the third varistor RV3, one end of the first Y capacitor CY2, and one end of the second differential mode inductor L2 are all connected to the neutral wire of the power grid system. The other end of the fuse F1 is connected to the other end of the first varistor RV1, one end of the fourth varistor RV4, one end of the second Y capacitor CY3, and one end of the first differential mode inductor L1, respectively. The other end of the fourth varistor RV4 is connected to the other end of the third varistor RV3 and the gas discharge tube GT1. One end of the gas discharge tube GT1 is connected to the other end of the second Y capacitor CY3 and the other end of the first Y capacitor CY2, respectively, and grounded. The other end of the first differential mode inductor L1 is connected to one end of the X capacitor CX1, one end of the second varistor RV2, and the second pin of the common mode inductor RL1. The other end of the second differential mode inductor L2 is connected to the other end of the X capacitor CX1, the other end of the second varistor RV2, and the third pin of the common mode inductor RL1. The first pin of the common mode inductor RL1 is connected to one end of the sampling resistor RS1 and one end of the fifth varistor RV5. The fourth pin of the common mode inductor RL1 is connected to the other end of the fifth varistor RV5 and the input terminal of the first relay. The other end of the sampling resistor RS1 is connected to the input terminal of the second relay and one end of the high-power resistor RS2. The other end of the high-power resistor RS2, the output terminal of the first relay, and the output terminal of the second relay are all connected to the driving device.

[0044] In a specific embodiment, the PLC communication module includes a PLC signal transmission module 401 and a PLC module 402. The input terminal of the PLC signal transmission module is connected to the power grid system, the output terminal of the PLC signal transmission module is connected to the input terminal of the PLC module, and the output terminal of the PLC module is connected to the relay control module 103 and the dimming module 104. The dimming system also includes an AC-AD power supply module 403 for supplying power to the PLC module and the relay control module.

[0045] The circuit diagram of the PLC signal transmission module is as follows: Figure 7 As shown, C7 is a safety capacitor, which serves as a filter; D1 and D2 are transient suppression diodes, which serve as protection; CL1 is a coupling inductor, which serves as an isolation coupling; RR1 and RR2 are resistors, which can adjust the signal strength of the transmission line. The PLC signal is collected from L0 and N0 of the main circuit and transmitted to the PLC+ and PLC- terminals of the PLC module through isolation coupling.

[0046] The circuit diagram of the PLC module is as follows: Figure 8 As shown, this module is a key circuit unit for realizing broadband power line carrier communication and Internet+ intelligent lighting control in this control circuit, playing a crucial role as the control core. This circuit is based on a PLC module and constructed through the construction of peripheral circuits. Power is provided by an AC-DC power supply circuit, with connection points S and VO- as ground. Specifically, the GPIO5 pin of the PLC module outputs a PWM pulse signal to a dimming signal conversion output circuit for signal conversion, thereby outputting a 0-10V DC dimming signal and a 0-100% PWM dimming signal. The RX and TX points of the PLC module are connected to a power metering circuit for serial communication to receive power and temperature data, enabling overload, overcurrent, and overtemperature protection through data monitoring. The OFF point of the PLC module is connected to a relay control circuit to control the relay's opening and closing, thus controlling the dimming to turn off. The PLC+ and PLC- points are connected to a PLC signal transmission module for sending and receiving PLC signals. The power metering module reads the voltage and main circuit current data across the sampling resistor RS1 by connecting AC(N), RS1+, and RS1- of the main circuit. The BL0940 chip itself has a temperature detection function to collect and measure temperature data. Then, it connects to the RX and TX of the PLC module through optocouplers U7 and U8 to communicate with the PLC module via serial port signals for power consumption and temperature data.

[0047] The circuit diagram of the AC-AD power supply module is as follows: Figure 9 As shown, the AC-DC power supply circuit uses Mornsun's LS05-13B12R3 power module. It draws AC power from the main circuit's AC(N) and AC(L) terminals, filters and smooths it via CE1, and outputs a stable 12V voltage VO+, providing power to drive the relay coil in the relay control module. D3 is a TVS diode used to protect the U2 chip. The U2 chip is an LDO regulator that steps down VO+ to output a stable 3.3V voltage and a source voltage (S). The 3.3V voltage provides a pull-up voltage for the relay control circuit, and the S voltage powers the PLC module.

[0048] In a specific embodiment, the circuit diagram of the dimming module is as follows: Figure 10As shown, the dimming module uses the LM2902 operational amplifier chip U6 to build the peripheral circuit, converting the PWM pulse signal from the PLC module into a 0-10V DC dimming signal (output from point T) and a 0-100% PWM dimming signal (output from point P). D3 and D4 are TVS diodes used to protect the U6 chip from damage caused by external surge voltages. The dimming module is powered by the 12V voltage VO+ from the AC-DC power supply circuit.

[0049] In a specific embodiment, the relay control module includes a first relay control circuit and a second relay control circuit; the first relay control circuit is used to control the on and off states of the first relay, and the second relay control circuit is used to control the on and off states of the second relay. By controlling the first and second relays respectively, precise control of the drive device is achieved.

[0050] In a specific embodiment, please refer to Figure 11 The first relay control circuit includes a first current-limiting resistor R25, a second protection resistor R26, a third protection resistor R19, a first protection resistor R20, a first filter capacitor C15, a first diode D8, a first transistor Q1, and a second diode Q2. One end of the first current-limiting resistor R25 is connected to the power supply, and the other end of the first current-limiting resistor R25 is connected to one end of the first filter capacitor C15 and pin 3 of the first relay. The other end of the first filter capacitor C15 is connected to the power supply, the emitter of the first transistor Q1, the emitter of the second diode Q2, and one end of the first protection resistor R20. The anode of the first diode D8 is connected to pin 3 of the first relay, and the cathode of the first diode D8 is connected to pin 4 of the first relay. The collector of the first transistor Q1 is connected to pin 4 of the first relay. The base of the first transistor Q1 is connected to one end of the second protection resistor R26 and the collector of the second diode Q2. The base of the second diode Q2 and the other end of the first protection resistor R20 are both connected to one end of the third protection resistor R19. The other end of the third protection resistor R19 is connected to the output terminal of the PLC communication module, and the other end of the second protection resistor R26 is connected to the power supply.

[0051] In a specific embodiment, please refer to Figure 12The second relay control circuit includes a second current-limiting resistor R31, a third current-limiting resistor R27, a fourth protection resistor R29, a fifth protection resistor R30, a sixth protection resistor R28, a second diode D18, a second filter capacitor C16, a third filter capacitor CE6, a third transistor Q3, a fourth transistor Q4, and a fifth transistor Q5. One end of the second current-limiting resistor R31 is connected to the power supply, and the other end of the second current-limiting resistor R31 is connected to the third pin of the second relay, one end of the second filter capacitor C16, and the cathode of the second diode D18. The other end of the second filter capacitor C16 is connected to the power supply, the emitter of the third transistor Q3, one end of the third filter capacitor CE6, one end of the sixth protection resistor R28, and the collector of the fifth transistor Q5. The second diode... The positive terminal of D18 is connected to pin 4 of the second relay. The collector of the third transistor Q3 is connected to pin 4 of the second relay. The base of the third transistor Q3 is connected to one end of the third current-limiting resistor R27. The other end of the third current-limiting resistor R27 is connected to the other end of the third filter capacitor CE6, the other end of the sixth protection resistor R28, and one end of the collector of the fourth transistor Q4. The emitter of the fourth transistor Q4 is connected to one end of the fourth protection resistor R29. The other end of the fourth protection resistor R29 is connected to the power supply. The base of the fourth transistor Q4 is connected to the emitter of the fifth transistor Q5. The base of the fifth transistor Q5 is connected to one end of the fifth protection resistor R30. The other end of the fifth protection resistor R30 is connected to the output terminal of the PLC communication module.

[0052] Specifically, the relay control module is divided into two parts, which control the opening and closing of relays K1 and K2 respectively. K1-3 and K1-4 of the K1 relay controller circuit are connected to the two ends of the drive winding of relay K1, and K2-3 and K2-4 of the K2 relay controller circuit are connected to the two ends of the drive winding of relay K2. VO+ and 3.3V are the 12V and 3.3V voltages from the AC-DC power supply circuit, respectively, while off is the shutdown signal issued by the PLC module. To ensure that the closing times of relays K1 and K2 are sequential (K1 closes first, K2 closes later) and to achieve the aforementioned surge current suppression effect, the energizing of relays K1 and K2 by the two relay controller circuits must be sequential, i.e., K1 is energized first, and K2 is energized later. A charging delay scheme using electrolytic capacitors is adopted here. The specific operation process is as follows: Relays K1 and K2 are originally in the normally open state. When the main circuit is connected to the mains power, the power supply circuit starts supplying power, and each circuit starts operating after receiving power. Stable voltages are also provided at points VO+ and 3.3V. After running, the PLC module will output a low-level off voltage signal:

[0053] ①K1 relay control circuit: when off is low level, Q2 is cut off and Q1 is on, then VO+ will energize the winding of K1 relay, causing relay K1 to close.

[0054] ②K2 relay control circuit: When off is low level, Q4 and Q5 are turned on, and 3.3V will immediately charge CE6 until the voltage of CE6 reaches the balance point. The base voltage of Q3 will also gradually rise from 0V as the voltage of CE6 is reached. When a certain voltage is reached, Q3 will be turned on, and then VO+ will energize the winding of K2 relay, causing relay K2 to close.

[0055] As can be seen from the above, the low-level off signal arrives at the K1 and K2 relay control circuits simultaneously. However, due to the charging of the electrolytic capacitor CE6, the conduction of Q3 is delayed compared to Q1, which causes the closing of relay K2 to be delayed compared to the closing of relay K1.

[0056] Similarly, when relays K1 and K2 are disconnected, the PLC module will output a high-level off voltage signal:

[0057] ③ K1 relay control circuit: when off is high level, Q2 is on and Q1 is off, then VO+ will stop energizing the winding of K1 relay, causing relay K1 to disconnect;

[0058] ④ K2 relay control circuit: when off is high level, Q4 and Q5 are cut off, then 3.3V will stop supplying power to CE6, and CE6 will discharge through resistor R28. The base voltage of Q3 will also gradually decrease with the voltage of CE6. When it reaches a certain voltage, Q3 will be cut off, and then VO+ will stop energizing the winding of K2 relay, causing relay K2 to open.

[0059] As can be seen from the above, the high-level off signal arrives at the K1 and K2 relay control circuits simultaneously. However, due to the discharge delay of the electrolytic capacitor CE6, the cutoff of Q3 will be delayed compared to Q1, which will also cause the disconnection of relay K2 to be delayed compared to the disconnection of relay K1.

[0060] In a specific embodiment, the second embodiment of this application provides a dimming control device, including a dimming control system as described in any one of the first embodiments of this application, wherein the overall structural diagram of the dimming control system is as follows. Figure 13As shown. In this embodiment, the main circuit module of the device transmits electrical energy from the power grid system to the drive device; the PLC communication module receives the drive shutdown signal sent by the power grid system and sends a relay disconnect signal, or receives the drive dimming signal sent by the power grid system and sends a PWM pulse signal; the relay control module receives the relay disconnect signal and sends a shutdown signal; the relay unit receives the shutdown signal and shuts off the power to the drive device, so that the drive device can be shut off simply by sending a shutdown signal from the power grid system; the dimming module receives the PWM pulse signal and sends a DC dimming signal and a PWM dimming signal; the DC dimming signal and the PWM dimming signal adjust the output current of the drive device to achieve dimming, thereby simplifying the structure and control process of the control system and making the dimming operation simpler.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A dimming control system, characterized in that, The system includes: a main circuit module, a PLC communication module, a relay control module, and a dimming module, wherein a relay unit is provided in the main circuit module; The input terminals of the main circuit module and the PLC communication module are both connected to the power grid system. The output terminal of the relay unit of the main circuit module is connected to the drive device. The output terminal of the PLC communication module is connected to the input terminal of the relay control module and the input terminal of the dimming module. The output terminal of the relay control module is connected to the input terminal of the relay unit. The output terminal of the dimming module is connected to the drive device. The main circuit module is used to transmit electrical energy from the power grid system to the drive device; The PLC communication module is used to receive the drive shutdown signal sent by the power grid system and send the relay disconnect signal to the relay control module, or to receive the drive dimming signal sent by the power grid system and send the PWM pulse signal to the dimming module. The relay control module is used to receive the relay disconnect signal and send a shutdown signal to the relay unit; The relay unit is used to receive the shutdown signal and shut off the power to the drive device; The dimming module is used to receive the PWM pulse signal and send a DC dimming signal and a PWM dimming signal to the drive device for dimming; the DC dimming signal and the PWM dimming signal are used to adjust the output current of the drive device.

2. The dimming control system as described in claim 1, characterized in that, The main circuit module also includes a lightning protection unit, the input of which is connected to the power grid system and the output of which is connected to the relay unit; the lightning protection unit is used to suppress lightning surge voltage in the main circuit module.

3. The dimming control system as described in claim 2, characterized in that, The relay unit is a surge current limiting unit; the surge current limiting unit is used to suppress surge current in the main circuit module.

4. The dimming control system as described in claim 3, characterized in that, The main circuit module also includes an EMI unit, the input of which is connected to the output of the lightning protection unit, and the output of which is connected to the input of the surge current limiting unit. The EMI unit is used to filter out interference signals in the main circuit module and prevent electromagnetic interference.

5. The dimming control system as described in claim 1, characterized in that, The system also includes a power metering module, and a sampling resistor is provided in the main circuit module. The input terminal of the power metering module is connected to the main circuit module. The power metering module is used to obtain the power consumption and temperature parameters in the main circuit module through the sampling resistor.

6. The dimming control system as described in claim 1, characterized in that, The main circuit module includes a fuse, a first varistor, a second varistor, a third varistor, a fourth varistor, a fifth varistor, a gas discharge tube, a first Y capacitor, a second Y capacitor, a first differential mode inductor, a second differential mode inductor, an X capacitor, a common mode inductor, a sampling resistor, a high-power resistor, a first relay, and a second relay. One end of the fuse is connected to the live wire of the power grid system. One end of the first varistor, one end of the third varistor, one end of the first Y capacitor, and one end of the second differential mode inductor are all connected to the neutral wire of the power grid system. The other end of the fuse is connected to the other end of the first varistor, one end of the fourth varistor, one end of the second Y capacitor, and one end of the first differential mode inductor, respectively. The other end of the fourth varistor is connected to the other end of the third varistor and one end of the gas discharge tube, respectively. The other end of the gas discharge tube is connected to the other end of the second Y capacitor and the other end of the first Y capacitor and grounded. The other end of the first differential mode inductor is connected to the... One end of capacitor X, one end of the second varistor, and pin 2 of the common-mode inductor; the other end of the second differential-mode inductor is connected to the other end of capacitor X, the other end of the second varistor, and pin 3 of the common-mode inductor; pin 1 of the common-mode inductor is connected to one end of the sampling resistor and one end of the fifth varistor; pin 4 of the common-mode inductor is connected to the other end of the fifth varistor and the input terminal of the first relay; the other end of the sampling resistor is connected to the input terminal of the second relay and one end of the high-power resistor; the other end of the high-power resistor, the output terminal of the first relay, and the output terminal of the second relay are all connected to the driving device.

7. The dimming control system as described in claim 6, characterized in that, The relay control module includes a first relay control circuit and a second relay control circuit. The first relay control circuit is used to control the on and off state of the first relay, and the second relay control circuit is used to control the on and off state of the second relay.

8. The dimming control system as described in claim 7, characterized in that, The first relay control circuit includes a first current-limiting resistor, a first protection resistor, a second protection resistor, a third protection resistor, a first filter capacitor, a first diode, a first transistor, and a second diode; One end of the first current-limiting resistor is connected to the power supply. The other end of the first current-limiting resistor is connected to one end of the first filter capacitor and the third pin of the first relay. The other end of the first filter capacitor is connected to the power supply, the emitter of the first transistor, the emitter of the second diode, and one end of the first protection resistor. The anode of the first diode is connected to the third pin of the first relay, the cathode of the first diode is connected to the fourth pin of the first relay, the collector of the first transistor is connected to the fourth pin of the first relay, and the base of the first transistor is connected to one end of the second protection resistor and the collector of the second diode. The base of the second diode and the other end of the first protection resistor are both connected to one end of the third protection resistor. The other end of the third protection resistor is connected to the output terminal of the PLC communication module, and the other end of the second protection resistor is connected to the power supply.

9. The dimming control system as described in claim 7, characterized in that, The second relay control circuit includes a second current-limiting resistor, a third current-limiting resistor, a fourth protection resistor, a fifth protection resistor, a sixth protection resistor, a second diode, a second filter capacitor, a third filter capacitor, a third transistor, a fourth transistor, and a fifth transistor; One end of the second current-limiting resistor is connected to the power supply. The other end of the second current-limiting resistor is connected to the third pin of the second relay, one end of the second filter capacitor, and the negative terminal of the second diode. The other end of the second filter capacitor is connected to the power supply, the emitter of the third transistor, one end of the third filter capacitor, one end of the sixth protection resistor, and the collector of the fifth transistor. The positive terminal of the second diode is connected to the fourth pin of the second relay. The collector of the third transistor is connected to the fourth pin of the second relay. The base of the third transistor is connected to one end of the third current-limiting resistor. The other end of the third current-limiting resistor is connected to the other end of the third filter capacitor, the other end of the sixth protection resistor, and one end of the collector of the fourth transistor. The emitter of the fourth transistor is connected to one end of the fourth protection resistor. The other end of the fourth protection resistor is connected to the power supply. The base of the fourth transistor is connected to the emitter of the fifth transistor. The base of the fifth transistor is connected to one end of the fifth protection resistor. The other end of the fifth protection resistor is connected to the output terminal of the PLC communication module.

10. A dimming control device, comprising a dimming control system as described in any one of claims 1-9.

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