A mixed switch module of activated carbon adsorption-desorption regeneration device
By designing a hybrid switch module, the problems of arc erosion, electromagnetic interference, and inconvenient maintenance in traditional activated carbon regeneration devices are solved, achieving low-loss, long-life, and high-reliability power control, which is suitable for activated carbon adsorption-desorption regeneration devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU JIAJIATONG ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
- Filing Date
- 2025-08-29
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional activated carbon regeneration devices suffer from problems such as arc erosion of contacts, severe electromagnetic interference, high power loss, insufficient safety isolation, and inconvenient maintenance under frequent start-stop conditions, which affect system reliability and operating costs.
A hybrid switching module, including a parallel structure of relays and thyristors, is adopted. Combined with optocoupler isolation, RC absorption network, common mode choke and transistor design, a power control scheme with low electromagnetic interference, high reliability and safety isolation is formed. Through arc-free switching timing and standardized interface design, the relay and thyristor work together.
It significantly reduces power loss by 98%, extends contact life by 10 times, reduces electromagnetic interference by 16-40dB, simplifies maintenance procedures by 78%, improves system stability and safety, and reduces operating costs.
Smart Images
Figure CN224401507U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a hybrid switching module for an activated carbon adsorption-desorption regeneration device. Background Technology
[0002] Activated carbon adsorption-desorption technology is one of the mainstream methods for treating volatile organic compounds (VOCs). Its working principle utilizes the highly efficient adsorption capacity of activated carbon for VOCs. After adsorption saturation, regeneration is achieved through heating for desorption and hot air circulation, thus realizing the recycling of activated carbon and effective treatment of VOCs. In this process, the electric heating element and the hot air circulation fan are key load devices, and the performance of their power control modules directly affects the operating efficiency, lifespan, and safety of the entire system.
[0003] Traditional power control schemes for activated carbon regeneration devices mainly employ three switching methods: First, a pure mechanical relay (K3) or contactor method, which has a simple structure but suffers from severe arcing under frequent start-stop conditions, short contact life, and is prone to electromagnetic interference; second, a pure thyristor (U4) switching method, which has no mechanical wear but suffers from high power loss and severe heat generation under long-term conduction, requiring a complex heat dissipation system; and third, a single-circuit switch with simple protection, which, although taking some issues into account, still has significant shortcomings in EMI suppression, safety isolation, and lifespan.
[0004] These traditional switching solutions face multiple challenges in the special application environment of activated carbon regeneration devices: First, the heating and fan in the regeneration process need to be started and stopped frequently, and the electric arc of traditional contactors will seriously corrode the contacts and shorten their service life; Second, the high-power start-up of the heater will generate surge current and electromagnetic interference, affecting the readings of sensitive sensors such as temperature and oxygen content in the system, and even causing false alarms; Third, there are flammable gases in the VOCs treatment environment, which requires extremely high electrical isolation and safety; Finally, environmental protection equipment is usually distributed in different areas, and the convenience of maintenance has a significant impact on operating costs.
[0005] Therefore, there is an urgent need to develop a hybrid switch module specifically designed for activated carbon adsorption-desorption regeneration devices, which can simultaneously solve multiple problems such as arc elimination, electromagnetic interference suppression, power loss reduction, safety isolation, and convenient maintenance, thereby improving system reliability, extending service life, and reducing maintenance costs. Utility Model Content
[0006] The purpose of this invention is to provide a hybrid switch module for an activated carbon adsorption-desorption regeneration device. This hybrid switch module for an activated carbon adsorption-desorption regeneration device features low electromagnetic interference, high reliability, long service life, and convenient maintenance.
[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution:
[0008] A hybrid switching module for an activated carbon adsorption-desorption regeneration device includes: an input / output terminal (CN2) for connecting an AC power supply and a load; a relay (K3) including a coil and two sets of contacts, the two sets of contacts being connected in series on the L and N lines of the AC power supply, respectively; a thyristor (U4) connected in parallel to the contacts of the relay (K3) to form a bypass channel; an optocoupler (U3) whose input terminal is connected to a control signal and whose output terminal is connected to the gate of the thyristor (U4) for triggering the thyristor (U4); and an RC absorption network (R32, C17) connected across the thyristor. The main terminal of (U4) is used to suppress switching noise; the common-mode choke (U30) is connected in series on the power channel to suppress common-mode interference; the transistor (Q2) is connected to the coil of the relay (K3) to control the closing and opening of the relay (K3); the freewheeling protection diode (D5) is connected in parallel to the coil of the relay (K3) to absorb the back electromotive force when the coil is de-energized; the control interface (SRC1, AC_POWER) includes a signal input terminal for triggering the optocoupler (U3) and a signal input terminal for controlling the transistor (Q2).
[0009] The present invention is further configured such that the relay (K3) is a double-pole double-throw relay (K3), and its two sets of contacts are respectively connected in series on the L line and N line of the AC power supply to form a completely electrical isolation structure.
[0010] The present invention is further configured such that: the thyristor (U4) is triggered by the optocoupler (U3) to form an opto-isolated structure with the control system, and the output terminal of the optocoupler (U3) is connected to the gate of the thyristor (U4) through a current-limiting resistor.
[0011] The present invention is further configured such that the RC absorption network (R32, C17) is directly connected across the main terminal of the thyristor (U4) to form the shortest loop structure, which is used to suppress voltage spikes and electromagnetic interference during the switching process.
[0012] The present invention is further configured such that the common mode choke (U30) adopts a toroidal magnetic core structure, with the L line and N line symmetrically passing through the magnetic core to form a common mode suppression structure.
[0013] The present invention is further configured such that: the base of the transistor (Q2) is connected to the signal input terminal of the control interface (SRC1, AC_POWER) through a current-limiting resistor, and the base of the transistor (Q2) is also connected to a pull-down resistor to prevent the signal from being floating and causing false triggering.
[0014] The present invention is further configured such that the input / output terminal (CN2) adopts a screw terminal structure with a terminal spacing of 5.0mm, for safe and reliable connection to external power supply and load.
[0015] The present invention is further configured such that the working sequence of the hybrid switch module is as follows: when powered on, the thyristor (U4) is first triggered to conduct, and then the relay (K3) is engaged; when powered off, the relay (K3) is first released, and then the thyristor (U4) is turned off, thereby realizing an arc-free switching process.
[0016] The present invention is further configured such that the contacts of the thyristor (U4) and the relay (K3) are connected in parallel. In the initial stage of power-on, the thyristor (U4) bears the load current, and after stabilization, the contacts of the relay (K3) bear the main load current, forming a hybrid switch dual-channel cooperative working structure.
[0017] The present invention is further configured such that the signal input terminals of the control interfaces (SRC1, AC_POWER) adopt 5V logic level control to achieve universal interoperability with various control systems.
[0018] In summary, this utility model has the following beneficial effects:
[0019] Hybrid Switching Dual-Channel Cooperative Working Structure: This invention employs a relay (K3) channel and a thyristor (U4) channel connected in parallel. The two power channels are arranged in parallel in physical space and achieve cooperative operation through timing control. The relay (K3) handles the long-term energized load, while the thyristor (U4) handles the transient process. This structure overcomes the shortcomings of traditional switching methods. Traditional relays (K3) are prone to arcing, shortening their lifespan, while thyristors (U4) have high power consumption during long-term conduction. Under normal operating conditions, current mainly flows through the relay (K3) contacts, whose contact resistance is only at the milliohm level, two orders of magnitude lower than the on-resistance of the thyristor (U4). For a load current of 16A, power loss is reduced from 128-256W in a pure thyristor (U4) scheme to 2-4W, saving 124-252W of energy consumption, reducing losses by approximately 98%, and significantly reducing switching noise by 15-20dB.
[0020] Zero-point soft start and arc-free turn-off timing structure: This invention employs a carefully designed switching sequence. Upon power-up, the thyristor (U4) is first triggered to conduct, followed by the engagement of the relay (K3); upon power-off, the relay (K3) is first released, followed by the turn-off of the thyristor (U4) at the next zero point. This sequential operation completely eliminates the arc generated when the relay (K3) contacts close and open under high current, thoroughly solving the problems of electromagnetic interference and component losses during the start-up and shutdown of high-power loads. Actual tests show that the starting inrush current is reduced by approximately 80-90%, and the turn-off arc is completely eliminated. This arc-free switching process increases the lifespan of the relay (K3) contacts from 10 years in traditional applications. 5 -10 6 This upgrade brings it close to its mechanical lifespan of 10 years. 7 It increases efficiency by about 10 times, making it particularly suitable for activated carbon regeneration devices that require frequent start-ups and shutdowns.
[0021] Multi-layered EMI suppression structure: This invention integrates multiple EMI suppression methods to form a systematic protection strategy. The RC absorption network (R32, C17) is directly connected across the main terminal of the thyristor (U4), forming the shortest loop and reducing the voltage change rate during switching from hundreds of V / μs to below 10V / μs. The common-mode choke (U30) adopts a toroidal magnetic core structure, with the L and N lines symmetrically passing through the core, providing up to 30-40dB attenuation for common-mode noise in the 150kHz-30MHz frequency band. The freewheeling protection diode (D5) is directly connected across the relay (K3) coil to suppress back electromotive force to the maximum extent. This multi-layered EMI suppression structure ensures stable readings from sensitive sensors such as temperature and oxygen content in the activated carbon regeneration device, avoiding false alarms or control deviations caused by electromagnetic interference, while also reducing interference to other equipment on the same power grid.
[0022] Dual Electrical Isolation Safety Structure: This invention employs a dual isolation structure combining optocoupler (U3) isolation and relay (K3) physical isolation, providing redundant safety protection. The optocoupler (U3) opto-isolates the control side from the power side, eliminating electrical coupling; the two sets of contacts of the double-pole double-throw relay (K3) are connected in series on the L and N lines respectively, forming complete electrical isolation. This dual isolation design ensures that even if one isolation method fails, the system maintains basic safety, with an isolation withstand voltage exceeding 4000V and a leakage current below 10μA, meeting the high safety requirements for flammable gases in VOCs treatment environments.
[0023] Universal Standardized Interface Design: This utility model adopts a standard 5V logic control interface (SRC1, AC_POWER) and a 5.0mm pitch screw terminal structure, achieving seamless integration with various control systems. Current-limiting resistors and pull-down resistors are installed between the signal input terminals of the control interface (SRC1, AC_POWER) and the transistor (Q2) and optocoupler (U3) to enhance the robustness of the interface. This standardized interface design allows the module to directly connect to over 90% of industrial control equipment, including PLCs, microcontrollers, and remote I / O, greatly simplifying system integration and on-site maintenance. Practical applications show that the modular design reduces the traditional 1-2 hour repair time to 10-15 minutes, improving maintenance efficiency by approximately 75%, making it particularly suitable for the operation and maintenance needs of distributed environmental protection equipment. Attached Figure Description
[0024] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings.
[0026] like Figure 1 As shown, a hybrid switch module for an activated carbon adsorption-desorption regeneration device includes input / output terminals (CN2), a relay (K3), a silicon controlled rectifier (U4), an optocoupler (U3), an RC absorption network (R32, C17), a common-mode choke (U30), a transistor (Q2), a freewheeling protection diode (D5), and a control interface (SRC1, AC_POWER).
[0027] The overall structure of this invention adopts a dual-path parallel switching structure, mainly consisting of two parallel power paths: a relay (K3) channel and a thyristor (U4) channel. These two paths are physically partitioned. The overall structure follows the principle of power flow, forming a linear energy transfer path from the input terminal to the output terminal, while maintaining isolation boundaries in the control signals.
[0028] The input / output terminal (CN2) is used to connect AC power and load. It adopts the KF243-5.0-3P type screw terminal structure with a terminal spacing of 5.0mm, which facilitates field wiring and maintenance. The terminal design meets the maximum 2.5mm... 2 The cross-sectional area of the conductor must be able to carry a load current of 16A, be firmly fixed to the circuit board, and withstand frequent plugging and unplugging as well as external forces.
[0029] The relay (K3) consists of a coil and two sets of contacts, which are connected in series on the L and N lines of the AC power supply, respectively. The relay (K3) uses a double-pole double-throw (DPDT) structure, model G2R-2-DC5. The two independent sets of contacts control the L and N lines respectively, forming complete electrical isolation. The contacts use a normally open contact series connection, ensuring that the load is completely disconnected when the relay (K3) coil is de-energized. The relay (K3) is installed between the input terminal CN2 and the common-mode choke (U30), directly connected in series on the AC-L and AC-N lines. The contact spacing meets the safety clearance requirements for AC electrical appliances, ensuring no risk of breakdown under high voltage conditions.
[0030] The thyristor (U4) is connected in parallel with the contacts of the relay (K3) to form a bypass path. The thyristor (U4) is model BTA16-600B, in a TO-220 package, and features a metal heat sink for easy connection to a heat sink. The thyristor (U4) is mounted with the heat sink facing upwards to facilitate natural convection cooling. The terminals of the thyristor (U4) are directly connected to the AC-L line, forming the main current path. The parallel connection of the thyristor (U4) and relay (K3) contacts allows the thyristor (U4) to handle the load current initially upon power-up, while the relay (K3) contacts handle the main load current after stabilization, creating a hybrid switching dual-channel cooperative working structure.
[0031] The input of the optocoupler (U3) is connected to the control signal, and its output is connected to the gate of the thyristor (U4) to trigger it. The optocoupler (U3) is a CT3021 model and is installed near the gate of the thyristor (U4). The output of the optocoupler (U3) is connected to both the gate and the main terminal of the thyristor (U4), forming a trigger circuit. The output of the optocoupler (U3) is connected to the gate of the thyristor (U4) through a current-limiting resistor (R2). The current-limiting resistor has a value of 470Ω and is installed close to the gate of the thyristor (U4) to reduce the trigger wire length and lower interference sensitivity. The input and output of the optocoupler (U3) are completely separated spatially, enhancing isolation and forming an opto-isolated structure from the control system.
[0032] The RC snubber network (R32, C17) consists of a snubber resistor (R32) and a snubber capacitor (C17), connected across the main terminals of the thyristor (U4) to form the shortest loop structure, used to suppress voltage spikes and electromagnetic interference during switching. The snubber resistor has a value of 470Ω, and the snubber capacitor has a value of 0.1μF / 1000V. An anti-pulse capacitor is used, and it is vertically mounted to save space. The connecting wires of the RC snubber network (R32, C17) use relatively wide copper wire to ensure surge current withstand capability, and the installation spacing is kept sufficiently close to minimize voltage spikes.
[0033] A common-mode choke (U30) is connected in series in the power path to suppress common-mode interference. The common-mode choke (U30) employs a toroidal core structure, with the L and N lines symmetrically passing through the core to form a common-mode suppression structure. The common-mode choke (U30) is installed in the common section between the relay (K3) contact and the thyristor (U4). The common-mode choke (U30) suppresses both switching modes, providing up to 30-40 dB attenuation for common-mode noise in the 150 kHz-30 MHz frequency band.
[0034] Transistor (Q2) is connected to the coil of relay (K3) to control the activation and deactivation of relay (K3). Transistor (Q2) is an S8050, packaged in a TO-92, and mounted vertically on the circuit board for easy heat dissipation. The base of transistor (Q2) is connected to the signal input terminal (AC_POWER) of the control interface (SRC1, AC_POWER) via a 1kΩ current-limiting resistor (R56). A pull-down resistor (R57) with a resistance of 10kΩ is also connected to the base of transistor (Q2) to prevent false triggering due to floating signals. The collector of transistor (Q2) is connected to the positive power supply via the relay (K3) coil, while the emitter is grounded, forming a low-side drive structure. Transistor (Q2) is physically isolated from high-voltage components to ensure a safe distance.
[0035] A freewheeling protection diode (D5) is connected in parallel with the coil of the relay (K3) to absorb the back electromotive force when the coil is de-energized. The diode is a 1N4007 model and is mounted close to both ends of the relay (K3) coil to form the shortest freewheeling path. The freewheeling protection diode (D5) ensures that the induced voltage is safely absorbed when the coil is de-energized, preventing damage to the drive circuit from high-voltage backflow and extending the lifespan of the drive circuit.
[0036] The control interface (SRC1, AC_POWER) includes a signal input terminal (SRC1) for triggering the optocoupler (U3) and a signal input terminal (AC_POWER) for controlling the transistor (Q2). The signal input terminals of the control interface (SRC1, AC_POWER) adopt 5V logic level control, realizing universal interoperability with various control systems (PLC, microcontroller, remote I / O).
[0037] The overall structure of this invention spatially separates the power channel and the control channel. High-voltage AC-L and AC-N traces are completely separated from low-voltage control signals, ensuring safe isolation. Optocouplers (U3) and relays (K3) provide dual physical isolation between the control side and the power side, enhancing safety. Power components (relays (K3) and thyristors (U4)) are spatially separated to avoid localized overheating. The PCB trace width of the power channel is sufficiently large to facilitate heat dissipation and current conduction.
[0038] The working sequence of this invention is as follows: upon power-on, the thyristor (U4) is first triggered to conduct, and then the relay (K3) is engaged; upon power-off, the relay (K3) is first released, and then the thyristor (U4) is turned off, thus achieving an arc-free switching process. The specific working process is as follows:
[0039] Power-on self-test: The control system confirms that conditions such as air duct, oxygen content, and temperature meet safety requirements.
[0040] Soft start: First, a low level is provided to the SRC1 signal input terminal to drive the optocoupler (U3) to conduct, causing the thyristor (U4) to be triggered to conduct near the zero-crossing point of the voltage. The conduction of the thyristor (U4) at the zero point significantly suppresses the inrush current and electromagnetic noise of the heating wire or motor, reducing the starting inrush current by about 80-90%.
[0041] Bypass Closure: After a delay of several cycles, a high level is provided to the AC_POWER signal input terminal, which activates the relay (K3) through the transistor (Q2). After the relay (K3) contacts close, the main current is carried by a milliohm-level contact resistance, significantly reducing power consumption and heat generation. At this time, the current mainly flows through the relay (K3) channel, and the power loss is reduced from 128-256W of the thyristor (U4) to 2-4W of the relay (K3), saving 124-252W of energy.
[0042] Shutdown process: When power is cut off, the AC_POWER signal is first canceled, releasing the relay (K3). Then, the SRC1 signal is canceled, and the thyristor (U4) automatically extinguishes at the next voltage zero-crossing point, achieving arc-free shutdown. This shutdown method completely eliminates the arc generated when the relay (K3) contacts open under high current, extending the contact life by approximately 10 times.
[0043] Abnormal protection: If power is lost at any time, the freewheeling protection diode (D5) releases the energy of the relay (K3) coil; the RC absorption network (R32, C17) and the common mode choke (U30) suppress voltage spikes and prevent false tripping of the upstream leakage current protection device.
[0044] This invention achieves comprehensive performance with low electromagnetic interference, high reliability, long service life, and convenient maintenance through a hybrid switch dual-channel collaborative working structure, zero-point soft start and arc-free turn-off timing, multi-level EMI suppression, dual electrical isolation, and universal standardized interface. It is particularly suitable for use in environmental protection equipment with stringent requirements, such as activated carbon adsorption-desorption regeneration devices.
[0045] Technical effect verification
[0046] 1. Verification Objectives and Methods
[0047] This verification scheme aims to evaluate the four core technological effects of the hybrid switch module in an activated carbon adsorption-desorption regeneration device: reduced power loss, extended contact life, electromagnetic interference suppression, and improved maintenance convenience. The experiment employs a comparative testing method, comparing the hybrid switch module of this invention with three traditional control schemes (pure mechanical relay (K3), pure thyristor (U4) switch, and single-channel switch with simple protection). The test load uses the same 16A / 220V electric heater as in actual applications to simulate the working environment of the activated carbon regeneration device. Each test is repeated 50 times to ensure data reliability, and key parameters are recorded using professional instruments, including a thermal imager, spectrum analyzer, high-speed camera, and electrical aging test bench.
[0048] 2. Technical Effect Comparison Table
[0049]
[0050] 3. Verification Methods and Results
[0051] Power loss testing: Power loss and temperature rise of each module were measured using a precision power analyzer and thermal imager under a constant 16A load. After long-term operation (24 hours), the power loss of this module stabilized at 3.2W, with a maximum surface temperature of 38°C; while the pure thyristor (U4) solution had a power loss of 215W and a surface temperature exceeding 120°C, requiring additional heat dissipation equipment. The hybrid switch, by using a relay (K3) to handle the steady-state current, effectively reduced power loss by 98% and requires no additional heat dissipation measures under standard conditions.
[0052] Contact life test: Each switch scheme was tested for 10 days using an electrical aging test bench. 7 Secondary switching cycle acceleration test. Pure mechanical relay (K3) at 0.9 × 10 6 Subsequently, contact adhesion failure occurred; the single-channel switch with simple protection was 1.2 × 10 6 The contact resistance increased significantly after this test; however, the hybrid switch of this invention showed a significant increase in resistance at the end of the test (10... 7 The contacts remain in good conductive state even after multiple switching operations, and the contact resistance increases by no more than 5%. High-speed camera analysis shows that traditional solutions generate a noticeable electric arc at the moment of switching, while the present invention does not produce a visible electric arc.
[0053] EMI Suppression Test: Electromagnetic interference generated during switching was measured using an EMI receiver and a near-field probe. In the critical frequency band (150kHz), the radiation level of this module was only 42dBμV, lower than the GB / T 17626 standard limit of 38dB, while traditional solutions are only 5-20dB below the standard. In a VOCs simulation environment, the system equipped with this module showed an 85% reduction in fluctuations in oxygen content and temperature sensor readings, with no false alarms observed.
[0054] Ease of maintenance test: Ten technicians with varying levels of experience were invited to perform fault diagnosis and module replacement operations in a simulated field environment. The average operation time using this module was 12 minutes, while traditional solutions typically require 40-75 minutes. The standard 5V logic interface was successfully compatible with 12 different control systems tested (including PLCs, microcontrollers, and remote I / O) without requiring additional adapter circuitry.
[0055] 4. Verification Conclusion
[0056] Through system comparison testing, the hybrid switch module for activated carbon adsorption-desorption regeneration devices significantly outperforms traditional technologies in four core performance indicators: power loss is reduced by 98%, contact life is extended by nearly 10 times, EMI radiation is reduced by 16-40 dB, and maintenance time is shortened by 78%. These improvements translate into practical application value: the elimination of additional heat dissipation equipment reduces system size and cost; the extended lifespan and reduced maintenance frequency significantly reduce operating costs; effective EMI suppression ensures the accuracy of sensitive sensors and system stability; and simplified maintenance procedures reduce equipment downtime. Verification results demonstrate that this hybrid switch module is particularly suitable for environmental protection equipment such as activated carbon regeneration devices that require high reliability, low interference, and frequent start-stop operations.
Claims
1. A hybrid switching module for an activated carbon adsorption-desorption regeneration device, characterized in that, include: Input / output terminal (CN2) is used to connect AC power supply and load; The relay (K3) includes a coil and two sets of contacts, which are connected in series with the L line and N line of the alternating current, respectively. A thyristor (U4) is connected in parallel to the contacts of the relay (K3) to form a bypass channel; Optocoupler (U3), whose input terminal is connected to the control signal and whose output terminal is connected to the gate of the thyristor (U4), is used to trigger the thyristor (U4); An RC absorption network (R32, C17) is connected across the main terminal of the thyristor (U4) to suppress switching noise; A common-mode choke (U30) is connected in series in the power path to suppress common-mode interference; A transistor (Q2) is connected to the coil of the relay (K3) and is used to control the activation and deactivation of the relay (K3); A freewheeling protection diode (D5) is connected in parallel to the coil of the relay (K3) to absorb the back electromotive force when the coil is de-energized; The control interface (SRC1, AC_POWER) includes a signal input terminal (SRC1) for triggering the optocoupler (U3) and a signal input terminal (AC_POWER) for controlling the transistor (Q2).
2. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The relay (K3) is a double-pole double-throw relay (K3), with its two sets of contacts connected in series on the L line and N line of the AC power supply, forming a completely electrical isolation structure.
3. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The thyristor (U4) is triggered by the optocoupler (U3) to form an opto-isolated structure with the control system. The output terminal of the optocoupler (U3) is connected to the gate of the thyristor (U4) through a current-limiting resistor (R2).
4. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The RC absorption network (R32, C17) is directly connected across the main terminal of the thyristor (U4) to form the shortest loop structure, which is used to suppress voltage spikes and electromagnetic interference during the switching process.
5. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The common-mode choke (U30) adopts a toroidal magnetic core structure, with the L and N lines symmetrically passing through the magnetic core to form a common-mode suppression structure.
6. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The base of the transistor (Q2) is connected to the signal input terminal (AC_POWER) of the control interface (SRC1, AC_POWER) through a current-limiting resistor (R56). The base of the transistor (Q2) is also connected to a pull-down resistor (R57) to prevent the signal from floating and causing false triggering.
7. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The input / output terminal (CN2) adopts a screw terminal structure with a terminal spacing of 5.0mm, which is used to safely and reliably connect external power supply and load.
8. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The operating sequence of the hybrid switch module is as follows: when powered on, the thyristor (U4) is first triggered to conduct, and then the relay (K3) is engaged; when powered off, the relay (K3) is first released, and then the thyristor (U4) is turned off, thus realizing an arc-free switching process.
9. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The contacts of the thyristor (U4) and the relay (K3) are connected in parallel. In the initial stage of power-on, the thyristor (U4) bears the load current, and after stabilization, the contacts of the relay (K3) bear the main load current, forming a hybrid switch dual-channel cooperative working structure.
10. The mixed switching module of the activated carbon adsorption-desorption regeneration device according to claim 1, characterized in that, The signal input terminals (SRC1, AC_POWER) of the control interface (SRC1, AC_POWER) adopt 5V logic level control to achieve universal interoperability with various control systems.