Detection circuit for three-phase alternating current phase dislocation and phase loss and detection method of detection circuit

Abstract

The invention discloses a detection circuit for three-phase alternating current phase dislocation and phase loss and a detection method of the detection circuit. Three-phase alternating current which needs to be detected is connected into three interfaces R, S, T of the detection circuit; the three-phase alternating current is connected with the circuit by detecting an optocoupler forestage circuit to form a delta connection; and by the isolation of an optocoupler, a high-voltage signal is converted into a low-voltage 3.3V high low-level signal to be input into a central processing unit (CPU). By using the detection circuit for the three-phase alternating current phase dislocation and phase loss and the detection method of the detection circuit disclosed by the invention, under the condition that the wiring phase sequence error of the three-phase alternating current occurs, the error can be detected in time when the detection circuit is powered up and a safety protection measure is adopted, and therefore, danger is avoided and losses are reduced. Meanwhile, compared with other traditional detection methods, the detection method disclosed by the invention is saved in device material and reduced in cost.

Description

technical field [0001] The invention relates to a three-phase alternating current phase sequence and lack of phase detection circuit of an elevator and an elevator and a corresponding detection method thereof, belonging to the technical field of electric detection. Background technique [0002] In general elevator and escalator control systems, when three-phase AC is connected, inaccurate phase sequence connection will inevitably occur, causing the running direction of the elevator and escalator to be inconsistent with the set direction, or poor connection, resulting in dangerous situations such as missing. The sequence relay detects and judges the phase sequence of the three-phase alternating current, and connects a contact on the phase sequence relay in the safety circuit. If the phase sequence is wrong, the safety circuit will not work to ensure the safety of the escalator. Use this method to deal with it When the three-phase AC phase sequence or phase failure occurs, add...

AI Technical Summary

Problems solved by technology

[0002] In general elevator and escalator control systems, when three-phase AC is connected, inaccurate phase sequence connection will inevitably occur, causing the running direction of the elevator and escalator to be inconsistent with the set direction, or poor connection, resulting in dangerous situations such as missing. The sequence relay detects and judges the phase sequence of the three-phase alternating current, and connects a contact on the phase sequence relay in the safety circuit. If the phase sequence is wrong, the safety circuit will not work to ensure the safety of the escalator. Use this method to deal with it In the case of three-phase AC phase sequence or phase failure, additional relay equipment needs to be added, which increases the cost

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