Alcatel

Boashan Iron & Steel Co., Ltd.

Lan Zhang

Xiao Ling Chen

Feng Zhang

Shishu Xie

Hongxu Hei

Xiandong Liu

Aihua Ma

Peili Zhang

Yanwei Wang

JunKui Pan

HongBing Cheng

YuJian Qian

Xuejun Lu

A non-oriented electrical steel sheet with fine magnetic performance, and a calcium treatment method therefor, including an RH (Ruhrstahl-Heraeus) refinement step. The RH refinement step sequentially comprises a decarbonization step, an aluminum deoxidation step, and a step of adding calcium alloy. In the step of adding calcium alloy, time when the calcium alloy is added satisfies the following condition: time interval between Al and Ca/total time after &#x3a3;Al=0.2-0.8. In this method, production cost is reduced, the production process is simple, a normal processing cycle of RH refinement is not affected, the device is convenient in operation and is controllable, and foreign substances are controllable in both shape and quantities. The non-oriented electrical steel sheet prepared according to the present invention has fine magnetic performance, and the method can be used for mass production of the non-oriented electrical steel sheet with fine magnetic performance.

Non-oriented electrical steel sheet with fine magnetic performance, and calcium treatment method therefor

The present invention provides a switching circuit for the master-slave feeding mode of the low voltage power supply. The switching circuit utilizes the active switches as the switching devices, so that it can increase the switching speed, decrease the voltage drop and loss, being suitable to the low voltage circuits, and can judge or determine the master power supply and the back-up power supply, realizing the switching between the master and slave power supplies without interruption. The switching circuit of the invention improves the reliability of the system and has the simple structure and easy operation.

Switching circuit for master-slave feeding mode of low voltage power supply

Growing community of inventors

Shanghai, China

Lan Zhang