Adaptive zero-crossing on-off control device and adaptive zero-crossing on-off control method

Abstract

The invention relates to the field of electrical engineering, and especially relates to an adaptive zero-crossing on-off control device and an adaptive zero-crossing on-off control method. The device is characterized in that a zero-crossing electromagnetic switch and a switching electromagnetic switch are connected in series with each other and then connected in parallel with a working electromagnetic switch, and the switches are connected to a load circuit; the switching electromagnetic switch switches the zero-crossing electromagnetic switch to a detection state and acquires the latest action delay of the zero-crossing electromagnetic switch; the switching electromagnetic switch corrects the action of the zero-crossing electromagnetic switch based on the action delay after switching the zero-crossing electromagnetic switch to the load circuit; and the working electromagnetic switch is connected in parallel to a working state. The beneficial effect is that an adaptive zero-crossing on-off control device and an adaptive zero-crossing on-off control method which can be used to precisely control connection at the zero-crossing moment of alternating voltage and disconnection at the zero-crossing moment of current in any environment are provided.

Description

technical field [0001] The invention relates to the field of electric engineering, in particular to an adaptive zero-crossing on-off control device and method. Background technique [0002] At present, mature zero-crossing switches generally refer to non-contact electronic switches, but limited by power and use environment, in many cases, only mechanical relays can be used. Traditional mechanical relays, slow action, and action time are affected by temperature, environment, total number of actions, continuous The number of actions and the action frequency have a great influence, so it is the key to determine the accurate power-on time of the relay in advance. At present, because the advance time cannot be accurately located, it cannot be used normally in many occasions, for example, switching of power-line power factor compensation capacitors. Chinese patent announcement CN200910053005.X-electromagnetic relay zero-crossing switch method and circuit discloses a zero-crossin...

AI Technical Summary

Problems solved by technology

The patent discloses a method for obtaining the correction advance, but the correction advance for the first pull-in or disconnection of any relay cannot be determined, and the result is that when the first pull-in or disconnection of the relay The generated arc will burn the relay, especially in the application of high-power power compensation, the first pull-in or disconnection must be in a zero-crossing state

In addition, the method of the said patent is to record the time of the last pull-in or disconnection, and send the data into the IC for storage and calculation to correct the advance amount. Large, there is still the problem of inaccurate correction advance

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