CN113970891A - Thing networking switch based on zero cross detection control - Google Patents
Thing networking switch based on zero cross detection control Download PDFInfo
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- CN113970891A CN113970891A CN202110899882.XA CN202110899882A CN113970891A CN 113970891 A CN113970891 A CN 113970891A CN 202110899882 A CN202110899882 A CN 202110899882A CN 113970891 A CN113970891 A CN 113970891A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H04L67/125—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks involving control of end-device applications over a network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
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- Automation & Control Theory (AREA)
- Electronic Switches (AREA)
Abstract
The embodiment of the application discloses an Internet of things switch based on zero-crossing detection control, which comprises a first control path and a second control path, wherein the first control path and the second control path are both connected with a control circuit, the first control path and the second control path are used for generating control signals, the control circuit is connected with a control end of a first switch, the control circuit is used for controlling the first switch to be switched on or off, and an output end of the first switch is connected with a load; the first control path comprises a second switch and a zero-crossing detection circuit, the zero-crossing detection circuit is used for detecting a zero-crossing signal, the second control path comprises an internet of things transceiver circuit, and the internet of things transceiver circuit is used for converting a received radio frequency signal into the control signal. The application utilizes the zero-crossing detection circuit to detect the zero-crossing signal in the circuit and/or utilizes the internet of things transceiver circuit to convert the received radio frequency signal into the control signal to the control circuit, so that the control circuit can control the on-off of the first switch, the switch control of the near end and/or the far end is realized, and the operation is convenient and fast.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to an Internet of things switch based on zero-crossing detection control.
Background
Currently, in an electrical control system, manual field operation is generally required to control a switch. With the development of the internet of things, people pay more attention to efficient and quick life style, and therefore, how to realize remote control of the switch becomes a problem to be solved urgently.
Disclosure of Invention
The embodiment of the application provides an thing networking switch based on zero cross detection control, can realize that the switch of near-end and/or distal end is controlled, convenient and fast.
The first aspect of the embodiments of the present application provides an internet of things switch based on zero-crossing detection control, the internet of things switch includes: a first control path, a second control path, a control circuit, and a first switch, wherein,
the first control path and the second control path are both connected with the control circuit, the first control path and the second control path are used for generating control signals, the control circuit is connected with the control end of the first switch, the control circuit is used for controlling the first switch to be switched on or switched off, and the output end of the first switch is connected with a load;
the first control path comprises a second switch and a zero-crossing detection circuit, and the zero-crossing detection circuit is used for detecting the zero-crossing signal;
the second control path comprises an internet of things transceiver circuit, and the internet of things transceiver circuit is used for converting the received radio frequency signal into the control signal.
It can be seen that, in the switch of the internet of things based on zero-cross detection control described in the embodiment of the present application, both the first control path and the second control path are connected to the control circuit, the first control path and the second control path are used for generating a control signal, the control circuit is connected to the control end of the first switch, the control circuit is used for controlling the first switch to be turned on or off, and the output end of the first switch is connected to the load; the first control path comprises a second switch and a zero-crossing detection circuit, the zero-crossing detection circuit is used for detecting a zero-crossing signal, the second control path comprises an internet of things transceiver circuit, and the internet of things transceiver circuit is used for converting a received radio frequency signal into the control signal. The application utilizes the zero-crossing detection circuit to detect the zero-crossing signal in the circuit and/or utilizes the internet of things transceiver circuit to convert the received radio frequency signal into the control signal to the control circuit, so that the control circuit can control the on-off of the first switch, the switch control of the near end and/or the far end is realized, and the operation is convenient and fast.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a structural block diagram of an internet of things switch based on zero-crossing detection control according to an embodiment of the present application;
fig. 2 is a circuit diagram of a zero-crossing detection circuit according to an embodiment of the present application;
FIG. 3a is a schematic diagram of an AC waveform provided by an embodiment of the present application;
fig. 3b is a schematic diagram of an output waveform of a zero-crossing detection circuit according to an embodiment of the present application;
fig. 4 is a circuit diagram of a control circuit according to an embodiment of the present application;
fig. 5 is a circuit diagram of a first switch according to an embodiment of the present application;
fig. 6 is a block diagram of another structure of an internet of things switch based on zero-crossing detection control according to an embodiment of the present application;
fig. 7 is a circuit diagram of an internet of things switch based on zero-crossing detection control according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, system, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The embodiments of the present application will be described with reference to the drawings, in which a dot at the intersection of intersecting wires indicates that the wires are connected, and a dot-free intersection indicates that the wires are not connected.
Referring to fig. 1, fig. 1 is a block diagram of an internet of things switch based on zero-crossing detection control according to an embodiment of the present application, where the internet of things switch includes: a first control path 10, a second control path 20, a control circuit 30 and a first switch 40, wherein the first control path 10 and the second control path 20 are both connected to the control circuit 30, the first control path 10 and the second control path 20 are used for generating control signals, the control circuit 30 is connected to a control terminal of the first switch 40, the control circuit 30 is used for controlling the first switch 40 to be closed or opened, and an output terminal of the first switch 40 is connected to a load 50; the first control path 10 includes a second switch 101 and a zero-crossing detection circuit 102, the zero-crossing detection circuit 102 is configured to detect the zero-crossing signal; the second control path 20 includes an internet of things transceiver circuit 201, and the internet of things transceiver circuit 201 is configured to convert the received radio frequency signal into the control signal.
Wherein the first control path 10 and the second control path 20 are connected in parallel to the control circuit 30. When the first control path 10 and/or the second control path 20 is turned on, the control circuit 30 may output a high level to control the first switch 40 to be in a closed state, and the live line is connected to the load 50 to supply power to the load 50.
Optionally, as shown in fig. 1, an input end of the second switch 101 is connected to the live wire, an output end of the second switch 101 is connected to an input end of the zero-crossing detection circuit 102, and an output end of the zero-crossing detection circuit 102 is connected to an input end of the control circuit 30. The second switch 101 is a momentary switch which is closed only when the button is pressed and is immediately restored to its original position when the button is released, i.e., is opened, so that when the button of the second switch is pressed by a user, the load 50 can be turned on to place the load 50 in an operating state.
Optionally, as shown in fig. 1, an output end of the internet of things transceiver circuit 201 is connected to an input end of the control circuit 30. When the internet of things transceiver circuit 201 receives a radio frequency signal sent by another electronic device for closing the first switch command, the internet of things transceiver circuit 201 may analyze and process the received radio frequency signal, so as to output a control signal to the control circuit 30 to control the first switch 40 to be in a closed state, and turn on the load 50, so that the load 50 is in a working state.
In the embodiment of the present application, a user may supply power to the load 50 and make the load 50 in a working state by pressing the second switch 101 and/or by a control command of the electronic device, so that the first switch is controlled in a short range and/or a long range, and the user can operate the first switch conveniently and quickly.
Optionally, as shown in fig. 2, the zero-cross detection circuit 102 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D2, a second diode D2, a third diode D3, a first capacitor C1, an electrolytic capacitor EC1, and a first transistor Q1; wherein the content of the first and second substances,
a first end of the first resistor R1 is connected to an input end of the zero-cross detection circuit 102, the other end of the first resistor R1 is connected to one end of the second resistor R2 and an anode of the second diode D2, the other end of the second resistor R2 is connected to one end of the third resistor R3, a cathode of the first diode D1, one end of the first capacitor C1 and a base of the first transistor Q1, the other end of the third resistor R3 is connected to an anode of the first diode D1, the other end of the first capacitor C1 and an emitter of the first transistor Q1, a cathode of the second diode D2 is connected to an anode of the third diode D3, a cathode of the third diode 3 is connected to an anode of the electrolytic capacitor EC1 and one end of the inductor L1, a cathode of the electrolytic capacitor EC1 is connected to a ground, a collector of the first transistor Q1 is connected to a first end of the first resistor R4 and a collector of the zero-cross detection circuit 4, respectively 102 and the other end of the fourth resistor R4 is connected to VDD.
The first transistor Q1 may be an NPN transistor, and the power line L is connected to the ground line N for zero-crossing detection, where L to N are AC input voltages at any time. When the alternating current is in the positive half cycle, that is, the voltage of the live wire is positive, the base of the first transistor Q1 is at a high level, the first transistor Q1 is turned on, and the zero-crossing detection circuit 102 outputs a low level; when the alternating current is in the negative half cycle, that is, the voltage of the live line is negative, the base of the first transistor Q1 is at the low level, the first transistor Q1 is turned off, and the zero-cross detection circuit 102 outputs the high level. Therefore, when the waveform of the alternating current is a sine wave as shown in fig. 3a, the output of the zero-cross detection circuit 102 is a square wave as shown in fig. 3 b.
Optionally, as shown in fig. 4, the control circuit 30 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, a third capacitor C3, a second transistor Q2, and a third transistor Q3; wherein the content of the first and second substances,
one end of the fifth resistor R5 is connected to the input end of the control circuit 30. One end of the sixth resistor R6, one end of the third capacitor C3, and the base of the third transistor Q3, the other end of the fifth resistor R5, the other end of the third capacitor C3, and the emitter of the third transistor Q3 are grounded, the other end of the sixth resistor R6 is connected to the collector of the second transistor Q2, the emitter of the second transistor Q2 is connected to VDD, the base of the second transistor Q2 is connected to one end of the second capacitor C2, one end of the seventh resistor R7, the collector of the third transistor Q3, and the output of the control circuit 30, respectively, and the other end of the second capacitor C2 is connected to the other end of the seventh resistor R7.
The third transistor may be an NPN-type transistor, and the second transistor may be a PNP-type transistor. When the control signal is a high pulse, the third capacitor C3 is charged, the emitter and the base of the PNP triode Q2 are both at a high level, the PNP triode Q2 is turned off, and the control circuit outputs a high level; when the control signal is a low pulse, the third capacitor C3 discharges, so that the NPN transistor and the base thereof are at a high level, the third transistor Q3 is turned on, the collector-emitter turn-on voltage drop of the turned-on third transistor Q3 is smaller to about 0.3V, the PNP transistor Q2 is turned on after voltage division by the seventh resistor R7, and the control circuit outputs a high level.
Optionally, as shown in fig. 5, the first switch 40 includes a fourth diode D4, an eighth resistor R8, a ninth resistor R9, and a fourth transistor Q4; one end of the eighth resistor R8 is connected to the input end of the first switch 40, the other end of the eighth resistor R8 is connected to the anode of a fourth diode D4, the cathode of the fourth diode D4 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the drain of the fourth transistor Q4, the gate of the fourth transistor Q4 is connected to the control end of the first switch 40, and the source of the fourth transistor Q4 is connected to the output end of the first switch 40.
When the control terminal of the first switch 40 receives a high level, the fourth transistor Q4 is in a conducting state, and the load 50 is conducted with the power supply circuit of the live wire; when the control terminal of the first switch 40 receives a low level, the fourth transistor Q4 is in an off state, and the load 50 is disconnected from the power supply circuit in the hot line.
Specifically, when the control circuit 30 outputs a low level to the first switch 40, when the gate of the fourth transistor Q4 receives a low level, there is no current between the source and the drain of the fourth transistor Q4, the fourth transistor Q4 is in an off state, the fourth transistor Q4 is in an off state, when the control circuit 30 outputs a high level to the first switch 40, when the gate of the fourth transistor Q4 receives a high level, there is a current between the source and the drain of the fourth transistor Q4, the fourth transistor Q4 is in an on state, the first switch 40 is in an on state, and the circuit between the load 50 and the live wire is connected.
Optionally, the internet of things transceiver circuit 201 includes an antenna, a wireless transceiver chip, and a monostable circuit; the antenna is connected with the wireless transceiver chip, the output end of the wireless transceiver chip is respectively connected with the monostable circuit, the monostable circuit is connected with the output end of the internet of things switch, and the monostable circuit is used for converting the high level output by the wireless transceiver chip into the control signal.
In the present embodiment, the first switch 40 may be remotely controlled by an electronic device. Specifically, the electronic device sends a radio frequency signal corresponding to a control instruction for closing the first switch through an antenna, and the antenna in the internet of things transceiver circuit 201 receives the radio frequency signal and sends the radio frequency signal to the wireless transceiver chip for analysis. When the wireless transceiver chip analyzes the radio frequency signal to control the first switch to be closed, the wireless transceiver chip outputs a high level. The monostable can then convert this high level into a square wave as described above in figure 3 b.
In this application embodiment, can realize the remote control of switch on electronic equipment through thing networking transceiver circuit 201 to can be controlled by a plurality of electronic equipment, convenient and fast.
The wireless transceiver chip can support ZigBee, WiFi, Bluetooth and other protocols.
It should be noted that, the above monostable circuit can refer to a monostable circuit in the prior art, and is not described herein again.
Optionally, as shown in fig. 6, the internet of things switch based on the zero-crossing detection control further includes a charging circuit 60, an input end of the charging circuit 60 is connected to the live wire, and an output end of the charging circuit 60 is connected to the internet of things transceiver circuit 201, the control circuit 30, and the zero-crossing detection circuit 102, respectively.
The charging circuit can provide a voltage of 3.3V for the internet of things transceiver circuit 201, the control circuit 30 and the zero-crossing detection circuit 102. Specifically, the charging circuit 60 may be respectively used as VDD in the internet of things transceiver circuit 201, the control circuit 30, and the zero-crossing detection circuit 102.
Optionally, as shown in fig. 7, fig. 7 is a circuit diagram of an internet of things switch based on zero-crossing detection control according to an embodiment of the present application.
It can be seen that in the switch of the internet of things based on the zero-crossing detection control provided by the embodiment of the application, the first control path and the second control path are both connected with the control circuit, the first control path and the second control path are used for generating the control signal, the control circuit is connected with the control end of the first switch, the control circuit is used for controlling the first switch to be turned on or off, and the output end of the first switch is connected with the load; the first control path comprises a second switch and a zero-crossing detection circuit, the zero-crossing detection circuit is used for detecting a zero-crossing signal, the second control path comprises an internet of things transceiver circuit, and the internet of things transceiver circuit is used for converting a received radio frequency signal into the control signal. The application utilizes the zero-crossing detection circuit to detect the zero-crossing signal in the circuit and/or utilizes the internet of things transceiver circuit to convert the received radio frequency signal into the control signal to the control circuit, so that the control circuit can control the on-off of the first switch, the switch control of the near end and/or the far end is realized, and the operation is convenient and fast.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application with specific examples, and the above description of the embodiments is only provided to help understand the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in view of the above, the content of the present specification should not be construed as a limitation to the present application.
Claims (7)
1. The utility model provides a thing networking switch based on zero cross detection control which characterized in that, thing networking switch includes: a first control path, a second control path, a control circuit, and a first switch, wherein,
the first control path and the second control path are both connected with the control circuit, the first control path and the second control path are used for generating control signals, the control circuit is connected with the control end of the first switch, the control circuit is used for controlling the first switch to be switched on or switched off, and the output end of the first switch is connected with a load;
the first control path comprises a second switch and a zero-crossing detection circuit, and the zero-crossing detection circuit is used for detecting the zero-crossing signal;
the second control path comprises an internet of things transceiver circuit, and the internet of things transceiver circuit is used for converting the received radio frequency signal into the control signal.
2. The switch of the internet of things based on the zero-crossing detection control as claimed in claim 1, wherein the second switch is a momentary switch, an input end of the second switch is connected to a live wire, an output end of the second switch is connected to an input end of the zero-crossing detection circuit, and an output end of the zero-crossing detection circuit is connected to an input end of the control circuit.
3. The switch of the internet of things based on the zero-crossing detection control as claimed in claim 2, wherein the zero-crossing detection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, a third diode, a first capacitor, an electrolytic capacitor and a first transistor; wherein the content of the first and second substances,
the first end of the first resistor is connected with the input end of the zero-crossing detection circuit, the other end of the first resistor is respectively connected with one end of the second resistor and the anode of the second diode, the other end of the second resistor is respectively connected with one end of the third resistor, the cathode of the first diode, one end of the first capacitor and the base of the first transistor, the other end of the third resistor is respectively connected with the anode of the first diode, the other end of the first capacitor and the emitter of the first transistor, the cathode of the second diode is connected with the anode of the third diode, the cathode of the third diode is respectively connected with the anode of the electrolytic capacitor and one end of the inductor, the cathode of the electrolytic capacitor is connected with the ground wire, and the collector of the first transistor is respectively connected with one end of the fourth resistor and the output end of the zero-crossing detection circuit, the other end of the fourth resistor is connected with VDD.
4. The Internet of things switch based on zero-crossing detection control as claimed in claim 3, wherein the control circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor, a second transistor and a third transistor; wherein the content of the first and second substances,
and one end of the fifth resistor is respectively connected with the input end of the control circuit. One end of the sixth resistor, one end of the third capacitor, and the base of the third transistor, the other end of the fifth resistor, the other end of the third capacitor, and the emitter of the third transistor are grounded, the other end of the sixth resistor is connected to the collector of the second transistor, the emitter of the second transistor is connected to VDD, the base of the second transistor is connected to one end of the second capacitor, one end of the seventh resistor, the collector of the third transistor, and the output terminal of the control circuit, respectively, and the other end of the second capacitor is connected to the other end of the seventh resistor.
5. The Internet of things switch based on zero-crossing detection control as claimed in any one of claims 1-4, wherein the first switch comprises a fourth diode, an eighth resistor, a ninth resistor and a fourth transistor; wherein the content of the first and second substances,
one end of the eighth resistor is connected with the input end of the first switch, the other end of the eighth resistor is connected with the anode of a fourth diode, the cathode of the fourth diode is connected with one end of the ninth resistor, the other end of the ninth resistor is connected with the drain electrode of the fourth transistor, the gate of the fourth transistor is connected with the control end of the first switch, and the source of the fourth transistor is connected with the output end of the first switch.
6. The switch of the internet of things based on the zero-crossing detection control as claimed in claim 1, wherein the transceiver circuit of the internet of things comprises an antenna, a wireless transceiver chip and a monostable circuit; wherein the content of the first and second substances,
the antenna is connected with the wireless transceiver chip, the wireless transceiver chip is connected with the monostable circuit, the monostable circuit is connected with the output end of the switch of the Internet of things, and the monostable circuit is used for converting the high level output by the wireless transceiver chip into the control signal.
7. A zero-crossing detection control-based switch of the Internet of things as claimed in any one of claims 1 to 6, wherein the zero-crossing detection control-based switch of the Internet of things further comprises a charging circuit, an input end of the charging circuit is connected with the live wire, and an output end of the charging circuit is respectively connected with the Internet of things transceiver circuit, the control circuit and the zero-crossing detection circuit.
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| CN202110899882.XA CN113970891B (en) | 2021-12-27 | 2021-12-27 | Thing networking switch based on zero cross detection control |
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| CN202110899882.XA CN113970891B (en) | 2021-12-27 | 2021-12-27 | Thing networking switch based on zero cross detection control |
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