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KR-20260063468-A - power supply control apparatus for load based on three-phase power

KR20260063468AKR 20260063468 AKR20260063468 AKR 20260063468AKR-20260063468-A

Abstract

The present invention relates to a power supply control device for a load based on three-phase power, comprising: a rectifier unit connected to all of the incoming three-phase four lines having a power line of the R phase, a power line of the S phase, a power line of the T phase, and a neutral line (N), rectifying power supplied through the incoming three-phase four lines and outputting it through first and second rectifier output terminals; a first converter that converts power output from the rectifier unit into AC and outputs it as power for the load; a second converter that converts power output from the rectifier unit into DC power for control and outputs it; a power status detection unit that detects power supply status information of the power supplied through the three-phase four lines; and a control unit that controls the first converter and processes information received from the power status detection unit to transmit information on the occurrence of an abnormality through a communication unit when a power abnormality occurs. According to this three-phase power-based load power supply control device, even if some phase lines are disconnected or the neutral line is disconnected in a three-phase four-wire power supply system, the supply of control power can be stably maintained, providing the advantage of easily taking countermeasures against power supply instability.

Inventors

  • 이환귀

Assignees

  • 주식회사 링크롤

Dates

Publication Date
20260507
Application Date
20241030

Claims (5)

  1. A rectifier unit connected to all of the incoming 3-phase 4-wires having an R-phase power line, an S-phase power line, a T-phase power line, and a neutral line (N), rectifies the power supplied through the incoming 3-phase 4-wires, and outputs it through first and second rectified output terminals; A first converter that converts the power output from the above rectifier into alternating current and outputs it as a power source for a load; A second converter that converts the power output from the above rectifier into a control DC power source and outputs it; A power status detection unit that detects power supply status information of the supply power supplied through the above 3-phase 4-wire; A three-phase power-based load power supply control device characterized by comprising: a control unit that controls the first converter and processes information received from the power status detection unit to transmit information regarding the occurrence of an abnormality through a communication unit when a power abnormality occurs.
  2. In paragraph 1, the rectifier A first diode connected between the first rectification output terminal of the above rectifier and the power line of the R phase to allow current flow from the power line of the R phase to the first rectification output terminal; A second diode connected between the first rectification output terminal of the above rectifier and the S-phase power line to allow current flow from the S-phase power line to the first rectification output terminal; A third diode connected between the first rectification output terminal of the above rectifier and the power line of the T-phase to allow current flow from the power line of the T-phase to the first rectification output terminal; A fourth diode connected between the first rectification output terminal of the above rectifier and the neutral line (N) to allow current flow from the neutral line (N) to the first rectification output terminal; A fifth diode connected between the second rectification output terminal of the above rectifier and the power line of the R phase to allow current flow from the second rectification output terminal to the power line of the R phase; A sixth diode connected between the second rectification output terminal of the above rectifier and the S-phase power line to allow current flow from the second rectification output terminal to the S-phase power line; A seventh diode connected between the second rectification output terminal of the above rectifier and the power line of the T-phase to allow current flow from the second rectification output terminal to the power line of the T-phase; A three-phase power-based load power supply control device characterized by having an eighth diode connected between the second rectification output terminal of the rectification unit and the neutral line (N) to allow current flow from the second rectification output terminal to the neutral line (N).
  3. In paragraph 2, the first converter An inverter module comprising first and second switch elements connected in series to the first rectification output terminal and the second rectification output terminal and turned on or off by the control unit, and third and fourth switch elements connected in series to the first rectification output terminal and the second rectification output terminal and turned on or off by the control unit, and supplying power to the load through a first AC output terminal connected between the first and second switch elements and a second AC output terminal connected between the third and fourth switch elements; A contact switch connected between the first rectifier output terminal and the inverter module, which switches off the first relay line between the first rectifier output terminal and the inverter module when the voltage output from the first rectifier output terminal becomes below a set reference voltage; A CVCC module disposed between the above contact switch and the above first rectifier output terminal, with one end connected to the above first rectifier output terminal to support the supply of constant voltage and constant current; A battery connected between the other end of the above CVCC module and the second rectifier output terminal and charged by power supplied through the above CVCC module; A three-phase power-based load power supply control device characterized by comprising: a boost module, wherein one end is connected between the contact switch and the inverter module and the other end is connected to the other end of the CVCC module and is controlled by the control unit to boost the power charged in the battery and output it to the inverter module.
  4. A three-phase power-based load power supply control device according to claim 1, characterized in that the power status detection unit detects the voltage supplied through each of the three-phase four-wire lines and provides it to the control unit.
  5. A power supply control device for a three-phase power-based load, characterized in that, in claim 1, it further comprises a surge protector installed between the input three-phase four-wire and the rectifier.

Description

Power supply control apparatus for load based on three-phase power The present invention relates to a power supply control device for a load based on three-phase power, and more specifically, to a power supply control device for a load based on three-phase power constructed to support countermeasures for phase loss of a phase line and disconnection of a neutral line. In a three-phase four-wire system, a single-phase two-wire branch circuit is configured using the phase line and the neutral line (N) to supply single-phase AC power to each load, and the control power supply for controlling the load is also configured to receive single-phase AC power or DC voltage rectified from the single-phase AC power. In this case, if the phase of the phase line connected to the branch circuit is lost or the neutral line is disconnected, the power supply to the load as well as the control power supply is cut off. In addition, when multiple single-phase two-wire branch circuits are configured through the neutral and phase lines in a three-phase four-wire system, if the neutral line of the three-phase four-wire busbar circuit is disconnected, overvoltage may be applied to multiple branch circuits due to differences in the distribution of impedances of the load devices, and the load devices may be damaged. In cases where an abnormality occurs in the power supply system and could cause critical problems for the load, the use of the load must be stopped; however, there is a problem in that the use of the load cannot be stopped if the control power supply that controls the power supply to the load is also cut off. Therefore, in a three-phase four-wire power supply system, a power supply structure is required that can stably maintain the supply of control power in the event of a phase failure or a disconnection of the neutral wire. FIG. 1 is a block diagram showing a power supply control device for a load based on three-phase power according to the present invention, and FIG. 2 is a detailed circuit diagram of the power status detection unit and the rectifier unit of FIG. 1, and Figure 3 is a detailed circuit diagram of the first converter of Figure 1. Hereinafter, a power supply control device for a three-phase power-based load according to a preferred embodiment of the present invention will be described in more detail with reference to the attached drawings. FIG. 1 is a block diagram showing a three-phase power-based load power supply control device according to the present invention. Referring to FIG. 1, a power supply control device (100) for a three-phase power-based load according to the present invention comprises a power state detection unit (110), a surge protector (SPD) (120), a rectifier (130), a smoothing capacitor (140), a first converter (150), a second converter (170), a control unit (180), and a communication unit (190). The power status detection unit (110) detects power supply status information of the supply power supplied through the incoming 3-phase 4-line having the R-phase power line (10a), the S-phase power line (10b), the T-phase power line (10c) and the neutral line (N) (10d) and provides it to the control unit (180). The power state detection unit (110) can be constructed to detect the voltage supplied through each of the three-phase four lines (10a to 10d) as illustrated in FIG. 2 and provide it to the control unit (180). That is, the power state detection unit (110) is equipped with a first voltage sensor (V1) that detects the voltage between the R-phase power line (10a) and the neutral line (N) (10d) and provides it to the control unit (180), a second voltage sensor (V2) that detects the voltage between the S-phase power line (10b) and the neutral line (N) (10d) and provides it to the control unit (180), and a third voltage sensor (V1) that detects the voltage between the T-phase power line (10c) and the neutral line (N) (10d) and provides it to the control unit (180). A surge protector (120) is installed between the incoming 3-phase 4-line (10a to 10d) and the rectifier (120) to prevent overvoltage from being applied to the rectifier (120). A surge protector (120) can be installed between the R-phase power line (10a) and the neutral line (N) (10d), between the S-phase power line (10b) and the neutral line (N) (10d), and between the T-phase power line (10c) and the neutral line (N) (10d), respectively. The surge protector (120) operates to conduct current when the voltage exceeds a set reference voltage, and various known types may be applied. The rectifier (120) is connected to all of the input three-phase four lines having the R-phase power line (10a), the S-phase power line (10b), the T-phase power line (10c), and the neutral line (N) (10d), and rectifies the power supplied through the input three-phase four lines to output a DC voltage through the first and second rectifier output terminals (130a) (130b), and is described with reference to FIG. 2. The rectifier (120) is constructed with first to