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KR-102963068-B1 - POWER LINE COMMUNICATION SYSTEM

KR102963068B1KR 102963068 B1KR102963068 B1KR 102963068B1KR-102963068-B1

Abstract

The present invention relates to a power line communication system, comprising a main device electrically connected to a first power line and a second power line, and a sub device electrically connected to the first and second power lines and electrically connected to the main device through the first and second power lines, wherein the main device can alternate the voltage level of the first power line and the voltage level of the second power line according to the level of the data when transmitting data to the sub device.

Inventors

  • 정제윤

Assignees

  • 주식회사 경동나비엔

Dates

Publication Date
20260512
Application Date
20210623

Claims (18)

  1. A main device electrically connected to the first power line and the second power line; and A sub-device electrically connected to the first and second power lines and electrically connected to the main device through the first and second power lines; Includes, The above main device is, When transmitting data to the above sub-device, the voltage level of the first power line and the voltage level of the second power line are alternated according to the level of the data, and The above sub-device is, It includes a receiving circuit that determines the data based on the voltage levels of the first and second power lines, and The above receiving circuit is, An inverting circuit that outputs a digital logic level signal based on the voltage level of the first power line, A smoothing inverting circuit that outputs a digital logic level signal based on the voltage level of the second power line, and A power line communication system characterized by including a logic operation circuit that determines data by performing a logic operation on digital logic level signals output from the inversion circuit and the smoothing inversion circuit, and outputs the determination result.
  2. In claim 1, The above main device is, When the level of the above data is a high level, a first voltage is applied to the first power line and a second voltage is applied to the second power line, and A power line communication system characterized by applying the second voltage to the first power line and applying the first voltage to the second power line when the level of the above data is a low level.
  3. In claim 1, The above sub-device is, When receiving the data from the main device, the data is determined based on the voltage levels of the first and second power lines, which alternate voltage levels, and A power line communication system characterized by rectifying the current according to the voltage provided from the first and second power lines and using it as a power source.
  4. In claim 1, The above sub-device is, A power line communication system characterized by including a bridge diode that rectifies current according to the voltage provided from the first and second power lines.
  5. delete
  6. In claim 1, The above inversion circuit is, If the voltage level of the first power line is higher than a preset voltage level, a low-level signal is output, and A power line communication system characterized by outputting a high-level signal when the voltage level of the first power line is lower than the preset voltage level.
  7. In claim 1, The above smoothing inversion circuit is, Smooths the voltage of the second power line and outputs a low-level signal when the smoothed voltage level is higher than a preset voltage level, and A power line communication system characterized by outputting a high-level signal when the smoothed voltage level is lower than the preset voltage level.
  8. In claim 2, The above first voltage is, A power line communication system characterized by a voltage level higher than the voltage level of the second voltage above.
  9. In claim 1, The above main device is, When data is received from the above sub-device, a current path is formed to allow current to flow through the first power line, the sub-device, and the second power line, and A power line communication system characterized by determining the data according to the amount of current transmitted through the second power line.
  10. In claim 9, The above sub-device is, A power line communication system characterized by varying the amount of current flowing through the second power line according to the level of the transmitted data when transmitting data to the main device.
  11. In a main device electrically connected to a sub-device, An H-bridge circuit that applies a first voltage to either a first power line or a second power line and applies a second voltage to the other based on transmitted data; and It includes a transmission circuit that provides the above transmission data, and The above sub-device is, It includes a receiving circuit that determines the data based on the voltage levels of the first and second power lines, and The above receiving circuit is, An inverting circuit that outputs a digital logic level signal based on the voltage level of the first power line, A smoothing inverting circuit that outputs a digital logic level signal based on the voltage level of the second power line, and A main device characterized by including a logic operation circuit that determines the data by performing a logic operation on the digital logic level signals output from the inversion circuit and the smoothing inversion circuit, and outputs the determination result.
  12. In claim 11, The above H-bridge circuit is, A first transistor that receives the transmission data at its gate and applies the first voltage at its source, A second transistor that receives a signal obtained by inverting the transmission data at its gate and receives the first voltage at its source, A third transistor that receives the transmission data at its gate and has the drain of the first transistor connected to its drain, A fourth transistor that receives a signal obtained by inverting the transmission data at its gate, and has the drain of the third transistor connected to its drain, At one end, the source of the third transistor and the source of the fourth transistor are commonly connected, and at the other end, a ground terminal is connected. The node where the drains of the first and third transistors are commonly connected is, Connected to the above-mentioned first power line, and The node connected to the drains of the second and fourth transces mentioned above is, A main device characterized by being connected to the above-mentioned second power line.
  13. A receiving circuit that determines data based on the voltage levels of the first power line and the second power line and outputs the determination result as received data; and A bridge diode that rectifies current according to the first and second voltages transmitted from the first and second power lines; Includes, The above receiving circuit is, An inversion circuit that generates a first digital logic signal according to the voltage level transmitted from the first power line, A smoothing inversion circuit that generates a second digital logic signal according to the voltage level transmitted from the second power line, and A sub-device characterized by including a logic operation circuit that determines transmitted data based on the first and second digital logic signals and outputs a judgment result as the received data.
  14. In claim 13, The above sub-device is, A sub-device characterized by using the current rectified from the above bridge diode as a power source.
  15. delete
  16. In claim 13, The above inversion circuit is, If the voltage level transmitted from the first power line is higher than a preset voltage level, a low-level first digital logic signal is generated, and A sub-device characterized by generating a high-level first digital logic signal when the voltage level transmitted from the first power line is lower than the preset voltage level.
  17. In claim 13, The above smoothing inversion circuit is, Smoothing the voltage transmitted from the second power line, and if the smoothed voltage level is higher than a preset voltage level, generating the second digital logic signal of a low level, A sub-device characterized by generating a second digital logic signal of a high level when the smoothed voltage level is lower than the preset voltage level.
  18. In claim 13, The above logic operation circuit is, A sub-device characterized by including an exclusive NOR gate.

Description

Power Line Communication System The present invention relates to a power line communication system capable of non-polar 2-wire DC communication. Power line communication is a technology that enables the transmission and reception of data using power lines, and has been researched since the 1920s. Power line communication can be divided into a method that distinguishes between sections for transmitting and receiving power and sections for transmitting and receiving data, and a method that does not distinguish between sections for transmitting and receiving power and sections for transmitting and receiving data. The method of separating the power transmission section from the data transmission and reception section has the problem of not being able to receive power continuously, while the method of not separating the power transmission section and the data transmission and reception section has the problem of requiring the use of complex filter, modulation, and demodulation technologies to extract data from the received power. FIG. 1 is a diagram showing the configuration of a power line communication system according to one embodiment of the present invention. FIG. 2 is a diagram illustrating the electrical connection between a main device and a sub device in the configuration of a power line communication system according to one embodiment of the present invention. FIG. 3 is a diagram illustrating the operation of an H-bridge circuit in the configuration of a power line communication system according to one embodiment of the present invention. FIG. 4 is a diagram showing the configuration of a receiving circuit included in a sub-device among the configurations of a power line communication system according to one embodiment of the present invention. FIGS. 5 and 6 are drawings for explaining the operation of a receiving circuit included in a sub-device among the configurations of a power line communication system according to one embodiment of the present invention. FIG. 7 is a diagram illustrating the operation of a power line communication system according to an embodiment of the present invention. Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 7. FIG. 1 is a diagram showing the configuration of a power line communication system according to one embodiment of the present invention. Referring to FIG. 1, a power line communication system (1000) according to one embodiment of the present invention may include a main device (100) and a sub device (200). The main device (100) supplies power to the sub device (200) and can be configured to communicate with the sub device (200). The sub-device (200) operates by receiving power from the main device (100) and can be configured to communicate with the main device (100). At this time, in order to provide power from the main device (100) to the sub device (200), the main device (100) and the sub device (200) may be connected by two power lines (L1, L2). For example, direct current power may be provided from the main device (100) to the sub device (200) through the two power lines (L1, L2). The main device (100) may include a power supply circuit (110), a first logic circuit (120), a first transmission circuit (130), a first reception circuit (140), and an H-bridge circuit (150). The power supply circuit (110) can provide voltage (V1) to the first logic (120) and the H-bridge circuit (150). At this time, the voltage (V1) can be transmitted to the sub-circuit (200) through the H-bridge circuit (150). The first logic (120) may i