Impedance self-adjusting intelligent power-saving device and use method thereof

Abstract

The invention provides an impedance self-adjusting intelligent power-saving device and a use method thereof. According to an electromagnetic balance principle, a mode of increasing equivalent impedance at the moment of load starting is adopted to restrain starting current, the impedance self-adjusting intelligent power-saving device comprises a power supply system, an intelligent power-saving device and a load which are connected in series, and the impedances of the three are ZS, ZI and ZL in sequence. The intelligent power-saving device comprises a large current-limiting resistor and a resettable fuse which are connected in parallel, and the resistors are R1 and R2 respectively when the intelligent power-saving device works normally. The purpose of automatically controlling and restraining the starting current of the load can be achieved, the intelligent power saving effect is achieved, the service life of equipment can be prolonged, and impact on a power grid is reduced.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an impedance self-adjusting intelligent power-saving device and a method for using the same. Background technique [0002] With the popularization of the concept of energy saving and emission reduction and the increasing importance of energy resources, various intelligent power saving technologies have been vigorously developed. In practical applications, a large number of electrical equipment, such as various motors, have a high instantaneous starting current, and its starting current value can reach several times to dozens of times the rated current of the load. Such a high starting current causes a huge power loss. Waste of resources, and because the load turn-on time is uncontrollable, many devices need to be switched on and off frequently, which will cause various large and small random surge impacts and high-frequency pollution to the power grid, and will also have a great ...

AI Technical Summary

Problems solved by technology

[0005] Self-recovery fuses have been widely used in circuits to protect short circuits, but the current main method of use is only to use it as a fuse that does not need to be replaced manually, and it forms an open circuit state under high current, so it cannot be used for load starting. current suppression

[0006] A common way to suppress the load starting current is to use a large current-limiting resistor in series with the load to suppress the maximum current in the circuit. The power consumption is too large during normal operation, and it is generally difficult to achieve both

A common compromise method when starting motors and other equipment is to select a large current-limiting resistor in series with the motor to start the load. After the start is completed, artificially short-circuit the current-limiting resistor to avoid large power consumption. It is time-consuming and labor-intensive, and cannot form an automatic operation. There is a risk of sparking when a short-circuit connection is made.

Images