Phase failure detection device of three-phase alternating-current power supply and power electronic system

Abstract

The invention relates to a phase failure detection device of a three-phase alternating-current power supply and a power electronic system. The power supply is provided with first to third output ends;the phase failure detection device comprises first to third detection branches and a voltage detection module and / or a phase detection module; the three detection branches are respectively connectedto first to third resistors in series; the three detection branches are coupled among the three output ends in pairs; voltage between the first and second output ends is denoted as first line voltage;voltage between the second and third output ends is denoted as second line voltage; voltage between the first and third output ends is denoted as third line voltage; the voltage detection module and / or phase detection module can be respectively suitable for detecting the amplitude and the phase of three line voltage; and, when the voltage detection module detects that two amplitudes in the threeline voltage have a pre-set proportional relation and the amplitude sum of the two is equal to another one and / or the phase detection module detects that the phases of the three line voltage are same,phase failure of the power supply can be judged. By adoption of the phase failure detection device of the three-phase alternating-current power supply and the power electronic system disclosed by theinvention, the detection speed for the phase failure condition of the three-phase alternating-current power supply can be increased.

Description

technical field [0001] The invention relates to the technical field of power supply phase loss detection, in particular to a phase loss detection device and a power electronic system of a three-phase AC power supply. Background technique [0002] Three-phase AC power is mostly used as the excitation source in electronic systems. A three-phase AC power supply is capable of producing three sinusoidal AC currents or voltages with the same frequency, the same amplitude, and 120 degrees out of phase with each other. In order to consider the safety of the operation of the power electronic system, at least two three-phase AC power supplies are usually set in the power electronic system, one of which is used as a normal power supply, and the other is used as a backup power supply; in addition, an automatic transfer switch (Automatic TransferSwitch , referred to as ATS), when the normal power supply fails (such as phase loss), the ATS is used to switch the backup power supply to the...

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Problems solved by technology

[0004] In the prior art, Chinese patent document CN200720074853.5 and Japanese patent document 2008-187874 respectively disclose a fault detection device for a three-phase AC power supply. Has the defect of being slow to detect

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