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Method and circuit for detecting default phase of three-phase alternating-current supply

A three-phase AC and power supply phase loss technology, which is applied in the field of circuit detection, can solve the problems that the three-phase power supply cannot correctly report the phase loss fault, and achieve the effect of saving circuit costs, reducing judgment errors, and reducing electronic components

Pending Publication Date: 2018-05-15
BEIJING DYNAMIC POWER CO LTD
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Problems solved by technology

[0004] In order to solve the problem that the phase loss detection of the three-phase power supply proposed by the above background technology cannot correctly report the phase loss fault, the present invention provides a method and circuit for detecting the phase loss of the three-phase AC power supply

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  • Method and circuit for detecting default phase of three-phase alternating-current supply
  • Method and circuit for detecting default phase of three-phase alternating-current supply
  • Method and circuit for detecting default phase of three-phase alternating-current supply

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Embodiment Construction

[0041] In order to solve the technical problems raised in the background technology, the inventor thought of detecting the lack of phase of the three-phase AC power supply by combining the detection method of the resistance drop voltage and the optocoupler, so that the phase loss of the three-phase AC power supply can be accurately obtained. In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] Such as figure 2 As shown, the method for detecting phase loss of three-phase AC power provided by the present invention includes:

[0043] Step S10: Sampling the AC signal of each phase of the three-phase AC power supply in a resistive step-down manner;

[0044] Each phase line in the three-phase AC power supply outputs an AC signal, and the output AC signal is a high-voltage signal, so it is no...

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Abstract

The invention discloses a method and a circuit for detecting default phase of a three-phase alternating-current supply. The method comprises the following steps: sampling each phase of alternating-current signal of the three-phase alternating-current supply in a resistance step-down manner; rectifying the sampled three-phase alternating-current signal into a direct current signal; and detecting avoltage waveform of the direct current signal by utilizing an optical coupler, and determining default phase conditions of the three-phase alternating-current supply according to the voltage waveformof the direct current signal. With the adoption of the detection method, the obtained result is more accurate, the false alarm default phase condition caused by capacitance deviation or capacitance drop and the like by adopting a capacitor can be avoided in the resistance step-down manner, and the reliability of the default phase report is improved. In addition, the voltage waveform is detected byadopting the optical coupler, weak current output by a post-stage circuit is influenced by strong current output by the three-phase alternating-current supply, and accurate results are obtained.

Description

technical field [0001] The invention relates to the technical field of circuit detection, in particular to a method and circuit for detecting phase loss of a three-phase AC power supply. Background technique [0002] During the field application of high-voltage inverter products, the phase loss detection of the three-phase power in the power unit can be reported to the controller for emergency treatment in time when the three-phase power is out of phase, so as to prevent the power unit from being damaged due to long-term failure. Running in a phase loss state will cause circuit failure. Therefore, it is necessary to detect the circuit, and report the phase failure in time when the power unit is out of phase, so as to provide guarantee for the normal circuit and reduce the unnecessary shutdown status of the equipment, which will cause economic losses. [0003] Such as figure 1 As shown, in the prior art, the three-phase power is star-connected through the capacitor, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/16
CPCG01R29/16
Inventor 万晨杨鑫
Owner BEIJING DYNAMIC POWER CO LTD
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