KR102629659B1 - 2-wire power supply system and smart switch including the same - Google Patents

Abstract

A two-wire power supply system and a smart switch including the same are disclosed. The two-wire power supply system and smart switch of the present invention include a bridge circuit connected between a first wiring and a second wiring and including a rectifier; an AC/DC converter connected to the bridge circuit and configured to convert alternating current power to direct current power; a triac connected between the first wire and the second wire and arranged in parallel with the bridge circuit; a detecting circuit configured to detect a zero crossing point in the waveform of the AC power of the first wire and generate a zero crossing signal for the zero crossing point; And an MCU set to control on/off of the triac, turning on the triac at a first control time that is a first time after the zero crossing time based on the zero crossing signal. It may be provided including an MCU set to

Description

2-WIRE POWER SUPPLY SYSTEM AND SMART SWITCH INCLUDING THE SAME}

The present invention relates to a two-wire power supply system and a smart switch including the same. More specifically, it is configured to be compatible with the two-wire wiring for an existing mechanical light switch, and operates the circuit of the smart switch without a transformer. / Or relates to a two-wire power supply system capable of implementing on/off mode of a light and a smart switch including the same.

Due to the 4th Industrial Revolution, we are entering an era where various devices are connected to the IoT (Internet of Things) environment and can be controlled wirelessly. The current trend for light switches is to introduce smart switches to incorporate IoT technology.

However, unlike other IoT devices, in the case of a smart switch, power is not supplied to the smart switch when the light is turned on, so a separate power line connection is required for the user to install. Recently, a two-wire smart switch has been developed that can be installed without a separate power line connection for user convenience. However, it uses a transformer, so when turning on, power is supplied through the transformer, and when turning off, the power is supplied from AC power. It is provided by way of supply.

The method of using a transformer is that if the current consumption of the smart switch circuit and other power consumers is low, a large number of transformers are not needed. However, if the current consumption of the smart switch circuit and other power consumers increases, a large number of transformers are needed. There was a problem in that the size of the smart switch was excessively increased due to the need for . In addition, when multiple transformers are provided or their capacity is increased, there is a problem in that the stability of the smart switch is significantly reduced due to heat generated from the transformers.

Republic of Korea Patent Publication No. 10-0860743 (registered on October 29, 2008)

The present invention can provide a two-wire power supply system that can provide turn-on/turn-off mode without a transformer and a smart switch including the same.

The problems to be solved by the present disclosure are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

According to various embodiments of the present invention, a two-wire power supply system for a smart switch of a light includes a bridge circuit connected between a first wire and a second wire and including a rectifier; an AC/DC converter connected to the bridge circuit and configured to convert alternating current power to direct current power; a triac connected between the first wire and the second wire and arranged in parallel with the bridge circuit; a detecting circuit configured to detect a zero crossing point in the waveform of the AC power of the first wire and generate a zero crossing signal for the zero crossing point; And an MCU set to control on/off of the triac, turning on the triac at a first control time that is a first time after the zero crossing time based on the zero crossing signal. It may include an MCU set to

The MCU may be set to maintain the on state of the triac from the control point to the subsequent zero crossing point, and to turn off the triac from the subsequent zero crossing point.

The MCU may be set to maintain the off state of the triac from the subsequent zero crossing time to a second control time after the first time, and to turn on the triac from the second control time. there is.

The first time may be a time set based on 100% of the required power including the power required to drive the light and the power required to drive the smart switch, and the amount of power that is the sum of spare power in addition to the required power.

The first time may be a time that can be set so that the total amount of power supplied from the AC input can be distributed based on the power needed to drive the light and the power needed to drive the smart switch.

According to various embodiments of the present invention, a smart switch for a light includes a power supply module, a wireless module, a sensor module, and a user input module, and the power supply module is connected between a first wire and a second wire. , a bridge circuit including a rectifier; an AC/DC converter connected to the bridge circuit and configured to convert alternating current power to direct current power; a triac connected between the first wire and the second wire and arranged in parallel with the bridge circuit; a detecting circuit configured to detect a zero crossing point in the waveform of the AC power of the first wire and generate a zero crossing signal for the zero crossing point; And an MCU set to control on/off of the triac, turning on the triac at a first control time that is a first time after the zero crossing time based on the zero crossing signal. It may include an MCU set to

In addition to this, a computer program stored in a computer-readable recording medium for implementing and executing the present disclosure may be further provided.

In addition, a computer-readable recording medium recording a computer program for executing a method for implementing the present disclosure may be further provided.

The two-wire power supply system of the present invention and the smart switch including the same can provide turn-on/turn-off modes for lights without a transformer by controlling the on/off timing of the triac.

Compared to a conventional two-wire power supply system and a smart switch including the same, the two-wire power supply system of the present invention and the smart switch including the same can be driven without a transformer, thereby reducing costs due to a reduction in parts. It can provide an effect.

In addition, the two-wire power supply system of the present invention and the smart switch including the same can significantly improve the instability of the smart switch due to heat generated by using a conventional transformer.

The effects of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the description below.

Figure 1 is a circuit diagram of a two-wire power supply system for a smart switch, according to an embodiment of the present invention.
Figure 2 is a waveform diagram of a two-wire power supply system according to an embodiment of the present invention.
Figure 3 is a block diagram of a smart switch including a two-wire power supply system according to an embodiment of the present invention.
Figure 4 is a circuit diagram of a two-wire power supply system for a smart switch, according to an embodiment of the present invention.

Like reference numerals refer to like elements throughout this disclosure. The present disclosure does not describe all elements of the embodiments, and general content or overlapping content between the embodiments in the technical field to which the present disclosure pertains is omitted. The term 'unit, module, member, block' used in the specification may be implemented as software or hardware, and depending on the embodiment, a plurality of 'unit, module, member, block' may be implemented as a single component, or It is also possible for one 'part, module, member, or block' to include multiple components.

Throughout the specification, when a part is said to be “connected” to another part, this includes not only direct connection but also indirect connection, and indirect connection includes connection through a wireless communication network. do.

Additionally, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

Throughout the specification, when a member is said to be located “on” another member, this includes not only cases where a member is in contact with another member, but also cases where another member exists between the two members.

Terms such as first and second are used to distinguish one component from another component, and the components are not limited by the above-mentioned terms.

Singular expressions include plural expressions unless the context clearly makes an exception.

The identification code for each step is used for convenience of explanation. The identification code does not explain the order of each step, and each step may be performed differently from the specified order unless a specific order is clearly stated in the context. there is.

Hereinafter, the operating principle and embodiments of the present disclosure will be described with reference to the attached drawings.

Figure 1 is a circuit diagram of a two-wire power supply system for a smart switch, according to an embodiment of the present invention.

Figure 2 is a waveform diagram of a two-wire power supply system according to an embodiment of the present invention.

Referring to Figure 1, according to an embodiment of the present invention, the two-seat power supply system 100 includes a bridge circuit unit 110, an AC/DC converter 120, a triac 130, and a detecting circuit 140. ) and MCU 150.

According to one embodiment, the AC/DC converter 120, the triac 130, the detecting circuit 140, and the MCU 150 are connected to the first connection terminal 11 connected to the AC power supply ( 11a), and the second wiring 12a connected to the second connection terminal 12 connected to the AC power source. The second wiring 12a may be defined as a light wiring connected to the light 20.

According to one embodiment, the bridge circuit 110 may be configured as a diode bridge circuit. In addition, the bridge circuit 110 rectifies the alternating current power flowing between the first wiring 11a and the second wiring 12a and converts it into direct current power through the AC/DC converter 120, and converts the converted direct current power into smart By supplying power to a switch (e.g., smart switch 200 in FIG. 3), MCU 150, etc., the switching element of the light 20, that is, the triac 130, is turned on/off using the MCU 150. ) can be turned on/off.

For example, the bridge circuit 110 may be composed of at least one diode or electronic device to convert AC power to DC power so that the switching device can switch. The bridge circuit 110 may be arranged in parallel with the triac 130.

According to one embodiment, the AC/DC converter 120 may be located between the first wire 11a and the second wire 12a through the bridge circuit 110. Additionally, the AC/DC converter 120 may be arranged in parallel with the triac 130 through the bridge circuit 110.

The AC/DC converter 120 connects the first wire 11a and the second wire when a potential difference occurs in the rectifier part of the bridge circuit 110 according to the on/off control of the triac 130. (12a) is out of phase so that the AC/DC converter 120 can generate direct current power. The generated direct current power may be configured to be used as a power source for a smart switch (e.g., smart switch 200 in FIG. 3), MCU 150, or light 20. In addition, if a potential difference does not occur in the rectifier part of the bridge circuit 110 according to the on/off control of the triac 130, the first wire 11a and the second wire 12a are in phase. As a result, the AC/DC converter 120 cannot generate direct current power.

According to one embodiment, the triac 130 (triac) may be a semiconductor device for AC power control. Additionally, the triac 130 may be disposed between the first wiring 11a and the second wiring 12a. The triac 130 may be connected in parallel with the bridge circuit 110 and the AC/DC converter 120.

According to one embodiment, the triac 130 may be configured to serve to electrically separate AC power and DC power.

According to one embodiment, the triac 130 is controlled on/off by the MCU 150, thereby forming a potential difference in the bridge circuit 110. A detailed explanation of this will be provided later.

According to one embodiment, the detecting circuit 140 may be a circuit that detects zero-crossing of the AC power of the first wire 11a. For example, the detecting circuit 140 connects a plurality of transistors or FETs between the first wiring 11a and the second wiring 12a, and connects the first wiring using a base or gate. A signal (hereinafter referred to as a 'zero crossing signal') that confirms or detects the point of zero crossing can be generated according to the phase of the alternating current waveform in (11a). The zero crossing signal may be provided to the MCU 150.

According to one embodiment, the MCU 150 (micro-controller unit) may be set to control the on/off of the triac 150 based on the zero crossing signal provided from the detecting circuit 140. .

The MCU 150 includes a memory that stores data for an algorithm for controlling the operation of components in the device or a program that reproduces the algorithm, and at least one processor ( (not shown) may be implemented. At this time, the memory and processor may each be implemented as separate chips. Alternatively, the memory and processor may be implemented as a single chip.

According to one embodiment, the MCU 150 may turn on or turn off the triac 130 a first time later than the zero crossing time, based on the zero crossing signal. The MCU 150 may be configured to repeatedly perform these operations. Meanwhile, the MCU 150 may include a time-generator in which information about the first time is stored.

According to one embodiment, the MCU 150 may receive direct current power from the AC/DC converter 120. Additionally, the MCU 150 can turn off the light 20 by controlling the switching element of the light 20 to the off state when there is no user input. Additionally, the MCU 150 can turn on the light 20 by controlling the switching element of the light 20 to the on state when there is a user input.

Generally, a three-wire power supply system is configured to receive separate power for operation. However, in the present invention, since it is a two-wire power supply system 100, separate power is not supplied, and in the two-wire structure, a portion of the commercial AC power is used by a smart switch (e.g., smart switch 200 in FIG. 3) as a power source. It can be configured to do so.

For a more detailed explanation, the waveform when the light 20 is turned on will be described as an example with reference to FIG. 2 .

FIG. 2 shows waveform diagrams when the light 20 is turned on by the MCU 150 of FIG. 1.

Figure 2 shows the waveform of the voltage for AC power of 220 [Vrms], 60 [Hz], which is the standard for AC power in Korea, when the light is turned on.

Figure 2(a) is a waveform diagram of the first wiring 11a. Figure 2 (b) is a waveform diagram of the gate terminal that turns on/off the triac 130. Figure 2(c) is a waveform diagram of the second wiring 12a. Figure 2 (d) is a waveform diagram of the potential difference between the first wiring 11a and the second wiring 12a, and is a waveform diagram of the potential difference applied to the bridge circuit 110.

The detecting circuit 140 generates a zero crossing signal by checking the zero crossing point (ZC1, ZC2), which is the point at which the voltage becomes 0, in the voltage waveform of the first wire 11a as shown in (a) of FIG. 2. can do. The generated zero crossing signal may be provided to the MCU 150.

The MCU 150 may turn on the triac 130 at the first control time TC1, which is a first time T1 after the first zero crossing time ZC1. The triac 130 may be maintained in an off state from the time the user turns on the light 20 until the first control time TC1. Additionally, the MCU 150 may turn off the triac 130, which is controlled to be on at the first control time point TC1, at the second zero crossing time point ZC2. The MCU 150 may turn on the triac 130 at the second control time TC2, which is a first time T1 after the second zero crossing time ZC2. The triac 130 may be maintained in an off state from the second zero crossing time point (ZC2) to the second control time point (TC2), and may be maintained in an on state from the second time point (TC2) to the third zero crossing time point. there is.

Accordingly, looking at the voltage waveform of the second wiring 12a, in the section from the first time point TC1 to the second zero crossing time point ZC2 and the section from the second time point TC2 to the third zero crossing time point A voltage waveform is formed, and no voltage waveform is formed in the remaining sections.

The potential difference formed in the bridge circuit 110 may be formed by the difference between the waveform in FIG. 2(a) and the waveform in FIG. 2(c).

Accordingly, the potential difference formed in the bridge circuit 110 is the section from the time the user turns on the light 20 to the first control time point TC1 and from the second zero crossing time point ZC2 to the second control time point TC2. ), and may not be formed in the remaining sections.

In the present invention, a potential difference can be formed in the bridge circuit 110 even after the first zero crossing time (ZC1) by setting the time of turning on the triac 130 differently from the zero crossing time.

For example, if the time of turning on the triac 130 is the same as the zero crossing time, a potential difference may not be formed in the bridge circuit in all sections after the first zero crossing time. However, in the present invention, since the time of turning on the triac 130 is after the first time (T1) than the zero crossing time, there is a potential difference in the bridge circuit 110 in the section between the zero crossing time and the time when the triac 130 is turned on. There is an advantage in being able to form .

Accordingly, the present invention can be applied as a smart switch to a transformerless two-wire AC circuit.

Meanwhile, the first time (T1) can be set as follows. First, the required power, which is the sum of the power required by the smart switch and the power required by the light 20, may be defined as the first power.

At this time, the maximum potential difference (V1) generated in the bridge circuit 110 in the section between the zero crossing time and the first time point occurs at the control time point that is after the first time (T1) after the zero crossing time. At this time, the direct current power provided from the bridge circuit 110 and the AC/DC converter 120 by the maximum potential difference V1 may be defined as the second power. At this time, the first time T1 may be set so that the second power has a size of a specific ratio (for example, 5%) to the size of the first power. Accordingly, 95% of the power provided from the AC power source may be provided to the light 20, and the remaining 5% may be provided for the smart switch.

Meanwhile, although not shown, the present invention may further include a residual current removal condenser that removes residual current in the light 20 or the second wiring 12a connected to the light 20 when the light 20 is turned off.

Meanwhile, it is obvious that the power supply system 100 of the present invention, as shown in FIG. 4, may provide a structure connected to a plurality of lights 20, 21, and 22.

Figure 3 is a block diagram of a smart switch according to an embodiment of the present invention.

The smart switch 200 in FIG. 3 may be an IoT switch.

Referring to FIG. 3, the smart switch 200 may include a power supply module 210, a wireless module 220, a sensor module 230, and a user input module 240.

According to one embodiment, the power supply module 210 includes a two-wire power supply system (e.g., the power supply system 100 of FIG. 1) and a plurality of switching elements for switching devices including the light 20. may include.

The wireless module 220 may be configured for wireless control. Here, the wireless module 220 refers to a module for wireless communication, such as a Wi-Fi module, a Bluetooth module, etc., and may be configured to include at least one wireless module.

The sensor module 230 may be configured to provide internal environmental information to the user. Here, the sensor module 230 refers to a sensor for obtaining environmental information such as a temperature sensor, humidity sensor, fine dust sensor, carbon dioxide sensor, etc., and may be configured to include at least one sensor module 230.

The sensor module 230 senses at least one of the internal information of the device, the surrounding environment information surrounding the device, and the user information, and generates a sensing signal corresponding thereto. Based on these sensing signals, the control unit can control the driving or operation of the device, or perform data processing, functions, or operations related to an application program installed on the device.

As a specific explanation, when a temperature/humidity sensor is applied to the sensor module 230, the user can check the temperature and humidity data of the room where the smart switch 200 is installed with a mobile phone, and the temperature and humidity data rises rapidly in emergency situations such as fire. It can be applied so that the MCU (150) can check and send a notification to the user's mobile phone, or the user can check environmental information such as fine dust in the room and turn on the air purifier to purify the air in the room.

Additionally, the user input module 240 may be configured to include a mechanical switch or other switch device including a touch switch. The user input module 240 can basically be configured to include at least one light switch input, but in addition to the light switch input, it can be applied to switch inputs such as devices that can turn on/off loads, ventilators, and window openers. . Meanwhile, the user input module 240 may include a voice recognition module capable of recognizing the user's voice.

Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium that stores instructions executable by a computer. Instructions may be stored in the form of program code, and when executed by a processor, may create program modules to perform operations of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

Computer-readable recording media include all types of recording media storing instructions that can be decoded by a computer. For example, there may be Read Only Memory (ROM), Random Access Memory (RAM), magnetic tape, magnetic disk, flash memory, optical data storage device, etc.

The device described above may be implemented with hardware components, software components, and/or a combination of hardware components and software components. For example, devices and components described in embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), etc. , may be implemented using one or more general-purpose or special-purpose computers, such as a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. A processing device may execute an operating system (OS) and one or more software applications that run on the operating system. Additionally, a processing device may access, store, manipulate, process, and generate data in response to the execution of software. For ease of understanding, a single processing device may be described as being used; however, those skilled in the art will understand that a processing device includes multiple processing elements and/or multiple types of processing elements. It can be seen that it may include. For example, a processing device may include a plurality of processors or one processor and one controller. Additionally, other processing configurations, such as parallel processors, are possible.

Software may include a computer program, code, instructions, or a combination of one or more of these, which may configure a processing unit to operate as desired, or may be processed independently or collectively. You can command the device. Software and/or data may be used on any type of machine, component, physical device, virtual equipment, computer storage medium or device to be interpreted by or to provide instructions or data to a processing device. , or may be permanently or temporarily embodied in a transmitted signal wave. Software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media.

As described above, the disclosed embodiments have been described with reference to the attached drawings. A person skilled in the art to which this disclosure pertains will understand that the present disclosure may be practiced in forms different from the disclosed embodiments without changing the technical idea or essential features of the present disclosure. The disclosed embodiments are illustrative and should not be construed as limiting.

100: Two-wire power supply system
110: bridge circuit
120: AC/DC converter
130: triac
140: Zero-crossing detecting circuit
150: MCU
200: Smart switch

Claims (5)

In a two-wire power supply system for a smart switch of a light,
a bridge circuit electrically connected between the first wiring and the second wiring and including a rectifier;
An AC/DC converter electrically connected to the bridge circuit and converting alternating current power to direct current power;
a condenser electrically connected to the second wiring and removing residual current in the second wiring when the light is turned off;
a triac electrically connected between the first wire and the second wire and connected in parallel with the bridge circuit;
Detect a first zero crossing time point and a second zero crossing time point following the first zero crossing time point in the waveform of the AC power of the first wiring, and detect the first zero crossing time point and the second zero crossing time point. a detecting circuit that generates each of a first zero crossing signal and a second zero crossing signal; and
Includes an MCU that controls on/off of the triac,
The MCU is,
Based on the first zero crossing signal, the triac is turned on for a certain period of time at a first control time after a preset time than the first zero crossing time,
Based on the second zero crossing signal, at a second control time later than the second zero crossing time, the triac is turned on only for a certain time,
The preset time is,
A time set so that the total amount of power supplied by the AC power can be distributed based on the first amount of power required to drive the light and the second amount of power required to drive the smart switch,
A two-wire power supply system, wherein the first amount of power is greater than the second amount of power. delete delete delete In the smart switch of a light,
The smart switch of the light includes a power supply module, a wireless module, a sensor module, and a user input module that are electrically connected to each other,
The power supply module is,
a bridge circuit electrically connected between the first wiring and the second wiring and including a rectifier;
An AC/DC converter electrically connected to the bridge circuit and converting alternating current power to direct current power;
a condenser electrically connected to the second wiring and removing residual current in the second wiring when the light is turned off;
a triac electrically connected between the first wire and the second wire and connected in parallel with the bridge circuit;
Detect a first zero crossing time point and a second zero crossing time point following the first zero crossing time point in the waveform of the AC power of the first wiring, and detect the first zero crossing time point and the second zero crossing time point. a detecting circuit that generates each of a first zero crossing signal and a second zero crossing signal; and
Includes an MCU that controls on/off of the triac,
The MCU is,
Based on the first zero crossing signal, the triac is turned on for a certain period of time at a first control time after a preset time than the first zero crossing time,
Based on the second zero crossing signal, at a second control time later than the second zero crossing time, the triac is turned on only for a certain time,
The preset time is,
A time set so that the total amount of power supplied by the AC power can be distributed based on the first amount of power required to drive the light and the second amount of power required to drive the smart switch,
A smart switch, wherein the first amount of power is greater than the second amount of power.