An intelligent phase selection switch and its control circuit based on power carrier communication

Abstract

The invention provides an intelligent phase selection switch based on power carrier communication and its control circuit, comprising: a switch controller, one end of which is connected to a power supply bus, and the other end is connected to a current transformer; the power supply bus is also connected to a contactor and a diode One end; the other end of the diode is connected in series with one end of the auxiliary relay; the contactor is connected in parallel with the diode and the auxiliary relay; the other end of the auxiliary relay and the diode is connected to a current transformer; and the microprocessor, the carrier communication module, the signal sampling conditioning module, the power supply The control circuit composed of module, relay driver module and contactor driver module. The invention simplifies the control circuit of the intelligent phase selection switch, improves the reliability of the equipment at the same time, has extremely low loss, does not need an additional heat dissipation circuit, realizes arcless switching, and can greatly prolong the life of the contactor and auxiliary relay, and the power supply system is relatively stable. The switching time is short, which can meet the requirements of sensitive loads.

Description

technical field [0001] The invention relates to the field of power equipment, in particular to an intelligent phase selection switch based on power carrier communication and a control circuit thereof. Background technique [0002] A switch is an electronic component that can open a circuit, interrupt current, or divert it to other circuits. The most common switches are human-operated electromechanical devices that have one or more electrical contacts. The closure of the node means that the contact is conducting and allows current to flow; the open circuit of the switch means that the electronic contact is not conducting and forms an open circuit and does not allow current to flow. [0003] The switch is the most basic and one of the most important devices in the power grid. It is used to turn on and off different loads in the circuit and realize different control of the circuit. Switches can be divided into many different types according to their structures and uses. Among...

AI Technical Summary

Problems solved by technology

However, there are certain deficiencies in the current related technologies. For example, the current intelligent phase selection switch has a complex structure, and the AC contactor has a limited service life, which often causes arcing and burning problems; and if the thyristor is used, its cost will increase. And further complicate its control circuit, etc.

Images