KR102014089B1 - Direct current power supply system for internet of things of light switch - Google Patents

Abstract

The present invention relates to a DC power supply system provided in a light and a light switch, and more particularly, an electronic switch without additional wiring or battery installation even in the state where a mechanical switch for controlling one or more lights is already installed. The present invention relates to a DC power supply system for IoT implementation of a light switch capable of performing on / off control and DC power supply for IoT implementation.
More specifically, the present invention, the present invention includes a mechanical switch for controlling the on (on) / off (off) of the light, in the DC power supply system for the IoT (Internet of Things) implementation of the light switch A first DC power supply for supplying power to the lamp when the mechanical switch is off; A second DC power supply unit supplying power to the lamp when the mechanical switch is turned on; And a constant voltage supply unit supplying a constant voltage for implementing the electronic switch IoT without additional wiring, regardless of the on / off state of the mechanical switch. It provides a DC power supply system for IoT implementation of a light switch comprising a.

Description

DIRECT CURRENT POWER SUPPLY SYSTEM FOR INTERNET OF THINGS OF LIGHT SWITCH}

The present invention relates to a DC power supply system provided for a light and a light switch, and more particularly, even if a mechanical switch for controlling one or a plurality of lights is already installed on a wall or the like without any additional wiring or battery installation. The present invention relates to a DC power supply system for IoT implementation of a light switch capable of performing on / off control of an electronic switch and DC power supply for IoT implementation.

Lamps installed in the interior and exterior of general buildings such as homes and offices are controlled to be turned on or off by direct manipulation of a mechanical switch embedded in a wall.

Therefore, in order to turn on or off a desired light, the user can operate the mechanical switch directly to turn on or turn off the light.

However, most of the mechanical switch of the conventional light is installed in the form of embedded in the wall, in order to adjust the on / off of the desired light has caused a lot of inconvenience because the user must move to the mechanical switch position to operate.

Accordingly, technologies for controlling a light on / off using an electronic switch (or a smart switch) or controlling a desired light through a remotely controllable terminal such as a smart phone by implementing an Internet of Things (IoT) have been developed. It is still being developed.

In this case, when the mechanical switch of the lamp is in the off state, the electronic switch can be driven by configuring the DC power supply. However, when the current consumption of the DC power supply increases a certain amount according to the electronic switch circuit configuration, the lamp is turned on finely. I have a problem.

In addition, when the mechanical switch of the lamp is in the on state, both ends of the mechanical switch is short-circuited, so a general circuit cannot configure a DC power supply, and thus, the electronic switch cannot be controlled.

In order to solve the above problems, a method of extracting DC power by configuring a plurality of transformers in series in a mechanical switch-side power line has been proposed. There is a limit when the load current is large.

In addition, IoT implementation requires various values of current depending on the wireless communication method used, and if the current requires a higher or lower current than the normal level, the size of the transformer must be considerably larger or smaller. There is a big burden in terms of costs and costs.

Therefore, it is necessary to develop a DC power supply system for on / off control of electronic switches and stable IoT implementation while using existing electric light mechanical switch wiring.

Prior Art Documents Korean Patent Publication No. 10-2017-0026921

The present invention has been made to solve the above-described problems of the prior art, in the light on / off control structure using a conventional mechanical switch can supply power for electronic switch control and IoT implementation without additional wiring or battery installation. The purpose is to provide a DC power supply system.

More specifically, by providing a DC power supply system consisting of a DC power supply means when the mechanical switch on, a DC power supply means when the mechanical switch off and a constant voltage supply means for supplying a constant voltage regardless of the state of the mechanical switch electronic smart The specific purpose is to stably implement switch on / off control and IoT.

Technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description of the present invention. .

According to the present invention for solving the above problems of the prior art, including a mechanical switch for controlling the on (on) / off (off) of the light, the DC power supply for implementing the Internet of Things (IoT) of the light switch A system, comprising: a first DC power supply for supplying power to the light when the mechanical switch is off; A second DC power supply unit supplying power to the lamp when the mechanical switch is turned on; And a constant voltage supply unit supplying a constant voltage for implementing the electronic switch IoT without additional wiring, regardless of the on / off state of the mechanical switch. It provides a DC power supply system for IoT implementation of a light switch comprising a.

In the present invention, the first DC power supply is preferably composed of an AC-DC converter (Converter) for converting and supplying the external power supplied to AC to DC.

In the present invention, the second DC power supply is preferably composed of one or more bridge rectifiers using the potential difference across the diode.

The bridge rectifier of the present invention includes four diodes, and may be selected from a range of two to four in total.

In the present invention, the constant voltage supply unit preferably comprises a high cap EDLC (Hy-Cap Electric Double Layer Capacitor).

In the present invention, the constant voltage may be selected in the range of 1.5V ~ 15V.

In the present invention, it is preferable that the DC power supply system implements IoT of a light switch by interworking with a wireless communication unit capable of communicating with the outside.

In the present invention, the communication may correspond to any one or more of Wi-Fi communication, Zigbee communication, Z-wave communication, Bluetooth communication, or RF (Radio Frequency) wireless communication.

The present invention can implement the electronic switch structure and the IoT without additional wiring work or battery installation work in the mechanical switch structure of the existing light, there is an effect that can more efficiently control the light switch and save costs.

In addition, the present invention is a constant voltage supply unit is configured to include a high-cap EDLC to cover all the current consumption required for the IoT implementation irrespective of the type of wireless communication, it is possible to continuously supply a stable power to a wireless communication module or a wireless communication circuit. It can be effective.

In addition, the present invention, unlike the conventional power supply structure using a transformer having a limit in the circuit configuration by changing the size depending on the current value, the first DC power supply, the second DC power supply and the constant voltage supply without using a transformer By constructing the unit, it is possible to implement a DC power supply system with an appropriate size as needed.

1 is a block diagram of a DC power supply system for IoT implementation of a light switch according to an embodiment of the present invention.
2 is a circuit diagram of a DC power supply system for IoT implementation of a light switch according to an embodiment of the present invention.
3 to 7 are exemplary diagrams for explaining the operation of the first DC power supply unit when the mechanical switch-off according to an embodiment of the present invention.
8 to 11 are exemplary views for explaining the operation of the second DC power supply unit when the mechanical switch on in accordance with an embodiment of the present invention.
12 is an exemplary view for explaining the operation of the constant voltage supply unit according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to explain their invention in the best way. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise.

Even if a mechanical switch for controlling one or a plurality of lights is installed in indoor or outdoor walls, the present invention enables to perform DC power supply for on / off control of electronic switches and IoT implementation without additional wiring or battery. The invention includes a mechanical switch 30 for controlling the on (off) of the light (20) on, off in the DC power supply system for implementing the Internet of Things (IoT) of the electronic switch, the mechanical When the switch is off, the first DC power supply 40 for supplying power to the light, when the mechanical switch is turned on, the second DC power supply 50 for supplying power to the light and the mechanical switch on / Regardless of the OFF state, DC power supply system including a constant voltage supply unit 60 for supplying a constant voltage for the electronic switch IoT implementation without additional wiring Provided.

To help explain this, FIG. 1 is a block diagram of a DC power supply system for implementing an IoT of a light switch according to an embodiment of the present invention, Figure 2 is a light switch according to an embodiment of the present invention A circuit diagram of a DC power supply system for IoT implementation is shown.

Referring to the configuration of the present invention with reference to the drawings, firstly, the present invention generally includes a mechanical switch 30 embedded in the wall. In the drawing, the switch indicated by the reference numeral '30' may correspond to an existing mechanical switch, but when the electronic switch is configured, the reference numeral '30' may also be referred to as including (or individually) the electronic switch. Reference numeral '30' will be understood to mean a configuration that serves as a switch regardless of the driving method.

The mechanical switch 30 is a configuration for controlling the on / off of the lights 20 installed in one or a plurality of indoor and outdoor, and collectively referred to a variety of switches commonly found in homes or offices.

When implementing the Internet of Things (hereinafter referred to as "IoT") using the mechanical switch 30 as described above, when the mechanical switch is in the off state, as described above, required for wireless communication required for IoT implementation There is no problem with the current supply.

However, when the mechanical switch 20 is in an on state, both ends of the mechanical switch are short-circuited, which causes a problem in supplying current for implementing the IoT.

In addition, even when the mechanical switch 20 is in the off state, as the electronic switch circuit is configured, when the current consumption is increased to some extent for realizing the IoT, the lamp has a side effect of turning on a fine light.

The present invention for overcoming the above problems first includes a first DC power supply 40 for supplying power to the lamp 20 when the mechanical switch 30 is in the off state.

The first DC power supply 40 is composed of an AC-DC converter (Converter) for converting and supplying the external power supply 10 supplied to AC to DC, Figures 3 to 7 in an embodiment of the present invention Exemplary diagram for explaining the operation of the first DC power supply when the mechanical switch 30 according to the shown.

Referring to FIG. 3, when the mechanical switch 30 is in an off state, the AC external power supply 10 implements the first DC power supply 40 through a semiconductor IC dedicated to AC-DC Power Conversion through various loads and rectifiers. .

The semiconductor IC MP103 U2 shown in the figure is a device employing a smart inductorless regulator, and has a feature of transferring charge in an AC line to supply a DC voltage.

In the semiconductor IC, when the line voltage is less than 32 V at VB, the capacitor EC1 plays a role of charging, and there is a comparator for an internal low drop out (LDO) to adjust VOUT.

Referring to Figure 4, the start phase is described, with all pins at 0V, the AC line powers VIN through the rectifier, with the internal 19mA current source enabled.

The current between VIN and DR charges capacitor C8 at the base of the external Bipolar Junction Transistor (BJT) Q3.

Referring to FIG. 5, the internal current source is only activated when VIN is internal. The output regulator is disabled when VB is less than 15.25V, and DR provides 19mA of current. Conversely, when VB is greater than 15.25V, the output regulator is enabled and the semiconductor IC enters a steady state mode.

In steady-state mode, the DR current increases, where the DR / base current for the VB voltage is activated in the charge window of VIN, and the charge on the supplying capacitor, EC1, provides better efficiency for the LDO.

The internal comparator limits the VB voltage, and the VB peak threshold further increases efficiency by limiting the Drop Out voltage. If VB drops below 7.6V, the regulator is disabled, which operates differently depending on VOUT.

To protect the short circuit, the output current is limited to 170mA, which reduces the VB voltage when the output is shorted to ground.

LDO turns off when VB drops below 7.6V, and VB must be greater than 15.25V to activate LDO. Then, when the LDO is turned on, the output current reduces the VB voltage to reach 7.6V again, and this process is repeated until the output short-circuit condition ends.

To protect the circuit from overload, the second stage LDO is shut down immediately when the VB voltage drops to 7.6V. By setting the VB voltage to 15.25V using the input voltage, the LDO can be used. Thus, this configuration limits the output current and the maximum current is typically limited to 170mA.

If VB is shorted to GND (ground), the driver current is typically reduced to 19µs, preventing thermal damage to external BJT Q3.

In addition, to protect against overheating, a common resistor can be connected between RT and R5, R4, and GND connected in series, which can serve as ambient temperature sensing and protection and lower RT values.

As the ambient temperature increases, the voltage on the fixed internal current 80㎂ RT pin drops, and at high temperatures, VRT triggers VRTTHL (typically 0.8V), the internal OTP circuit is triggered, and the BJT driver and LDO are shut down immediately.

To set the output voltage, Rup and Rlw are compared with the internal resistance. The formula for calculating the general resistance value for various output voltages is as follows.

Rup = Rlw x (VOUT / 1.235-1)

VOUT (V) / Rup_R7 (kΩ) / Rlw_R1 (kΩ)

1.5V / 2.21 (1%) / 10.2 (1%)

3.3 V / 16.9 (1%) / 10.2 (1%)

5V / 30.9 (1%) / 10.2 (1%)

15V / 121 (1%) / 10.2 (1%)

As a countermeasure against surge as shown in Figs. 6 and 7, since the surge occurs instantaneously when VIN falls to the charging window, this energy is absorbed by the BJT Q3 and the semiconductor IC.

To protect the part from damage, it can be set to shut down the driver to a fast turn-off threshold (typically 71V), and there is no large capacitor on the AC line to absorb this energy, so Metal Oxide Varistor (MOV) for IC protection. Can be used.

In addition, fuse resistance also affects surge results, with larger values making it easier to deliver.

To pass the 1 surge test, the 750V external BJT Q3 can pass the proper 1㎸ of the semiconductor IC, taking into account some margin, and in this regard, varistor TVR1043 can be applied to the line input port, and better surge performance You can also connect a heat transfer pad to GND.

In addition, the present invention includes a second DC power supply unit 50 for supplying power to the lamp 20 when the mechanical switch 30 is in an on state.

8 to 11 show an exemplary view for explaining the operation of the second DC power supply when the mechanical switch on according to an embodiment of the present invention, the description thereof is as follows.

As shown in the drawings, the TER2 L_1 (load 1) and TER3 L_2 (load 2) wires are applied with "H" to SW-ON1 and SW-ON2 by an external Micom signal to turn on Q1 and Q2. As a result, the contacts RL1 and RL2 are changed from L1_1 and L2_2 = L to L1_1 and L2_2 = TER1 N_IN_COM, which are configured through the circuit.

Due to this operation, L_1 (load 1) and L_2 (load 2) are turned on, and current flows through TER1 N_IN_COM, which forms a potential difference across the NVD through a plurality of diodes on the TER1 N_IN_COM power line.

At this time, the potential difference across the NVD may vary depending on the number of diodes used. For example, if the value of diode Vf changes depending on the load but is in the range of approximately 0.6V to 1.1V, the number of diodes is 8 The potential difference across the NVD can be formed at about 1.1 x 8 = AC about 8.8V.

The voltage AC 8.8V, formed by the potential difference across the diode, is implemented in the DC power supply VDD-IN circuit through the rectifying circuit BD5.

On the other hand, the present invention includes a constant voltage supply unit 60 for supplying a constant voltage for implementing the electronic switch IoT, regardless of the on / off state of the mechanical switch 30, the additional additional wiring or It does not require battery installation.

12 is an exemplary view for explaining the operation of the constant voltage supply unit according to an embodiment of the present invention, the present invention is high in order to be able to charge more energy while minimizing the loss due to the Drop Out voltage A cap EDLC (Hy-Cap Electric Double Layer Capacitor) is used.

The high cap EDLC is a high output capacitor that stores electrical energy quickly and supplies a high current instantaneously or continuously. The high cap EDLC stores electrical energy by an adsorption-desorption reaction of electric charges using an electric double layer phenomenon. Accordingly, the damage of the electrode is small, has a semi-permanent life characteristics, there is an advantage that can be charged and discharged at a high output.

The constant voltage supply unit having such a configuration limits the power supply to 5V and 5㎃ in order to improve the part in which the lamp is finely lit as the current consumption increases.

The limited current through the constant voltage is charged in the high cap EDLC C11, and when the mechanical switch 30 is in the off state, the constant voltage supply unit 60 supplies the high cap EDLC for stable DC power supply using less energy of 5 V and 5 ㎃. Use

The limit of the current is set by the value of the resistor R8. The constant voltage may be selected in the range of 1.5 V to 15 V as necessary, and the current limit may also be changed as necessary.

On the other hand, the present invention includes a wireless communication unit that the DC power supply system can perform communication with the outside IoT of the light 20 switch 30 in conjunction with a terminal such as a smart phone or beacon using a variety of wireless communication methods Can be implemented.

Herein, the communication may correspond to any one or more of Wi-Fi communication, Zigbee communication, Z-wave communication, Bluetooth communication, or RF (Radio Frequency) wireless communication. Depending on the capabilities of the IoT, more than one communication can be used at the same time.

According to each communication method, the electric current required to implement the electronic switch 30 of the lamp 20 is different from each other. Generally, Wi-Fi communication is 60 to 300 ㎃, and Zigbee communication and Z-Wave communication are about 50 ㎃. Bluetooth communication requires about 10mA, and RF radio requires about 50mA.

In addition, a relay for controlling the on / off of the lamp 20 requires about 50 mA of current, and a semiconductor element triac or silicon controlled rectifier (SCR) element (= Thyristor) is also about 50 mA. Since it requires a current of the present invention, it is difficult to implement IoT without configuring the constant voltage supply unit 60 as in the present invention.

As a result, the present invention has the advantage that the electronic switch structure and the IoT can be implemented without additional wiring work in the mechanical switch structure of the existing lamp.

Accordingly, there is no advantage in terms of cost without the need for a separate construction or process.

In addition, the present invention has the advantage that the constant voltage supply unit is configured to include a high-cap EDLC to cover all the current required for the IoT implementation, regardless of the type of wireless communication, it is possible to provide a stable power supply for wireless communication.

In addition, the present invention has the advantage that the DC power supply system can be implemented in an appropriate size by configuring the first DC power supply, the second DC power supply and the constant voltage supply without using a transformer whose size should be adjusted depending on the current value. .

While the present invention has been described above in connection with specific embodiments of the present invention, this is only an example and the present invention is not limited thereto. Those skilled in the art can change or modify the described embodiments without departing from the scope of the present invention, and within the equivalent scope of the technical spirit of the present invention and the claims to be described below. Various modifications and variations are possible.

10: external power
20: light fixture
30: switch
40: first DC power supply
50: second DC power supply
60: constant voltage supply unit

Claims (8)

In the DC power supply system comprising a mechanical switch for controlling the light on (on) / off (off),
A first DC power supply configured to supply power to the lamp when the mechanical switch is turned off, the AC-DC converter converting external power supplied to AC into DC;
A second DC power supply unit supplying power to the lamp when the mechanical switch is turned on; And
Irrespective of the on / off state of the mechanical switch, a constant voltage is supplied to the first DC power supply unit and the second DC power supply unit to supply power to the lamp without any additional wiring. And a constant voltage supply unit selectively supplying the constant voltage in a range of 8.8V to 15V; Including,
The second DC power supply unit is formed with at least four bridge rectifiers, and among the four diodes included in each bridge rectifier, the second DC power supply unit adds the sum of the potential differences (Vf) due to the self-resistance of the two diodes which are turned on when a constant voltage is applied. DC power supply system for IoT implementation of a light switch, characterized in that to supply power to the light using.
delete delete delete delete delete The method of claim 1,
The DC power supply system is a DC power supply system for the IoT implementation of the light switch, characterized in that to implement the IoT of the light switch by interworking with a wireless communication unit that can communicate with the outside.
The method of claim 7, wherein
The communication is an IoT implementation of a light switch, characterized in that at least one of Wi-Fi communication, Zigbee communication, Z-wave communication, Bluetooth (Bluetooth) communication or RF (Radio Frequency) wireless communication DC power supply system.

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