A program-controlled constant current source degaussing device and degaussing method

Abstract

The invention discloses a program-controlled constant flow source degaussing device and a degaussing method. The program-controlled constant flow source degaussing device is composed of a constant flow source assembly, a capacitor, a discharge coil, a discharge switch and a control system assembly. The discharge switch is connected with the constant flow source assembly and the capacitor in parallel after being connected with the discharge coil in series, and the control system assembly is connected with the constant flow source assembly, the discharge switch and the capacitor, and monitors and controls the constant flow source assembly, the discharge switch and the capacitor. The control system presets a plurality of degaussing magnetic field strength grades, degaussing current values and capacitor discharge voltage values, wherein the degaussing current values and the capacitor discharge voltage values correspond to each magnetic field strength grade, a degaussing program is started after a magnetic field strength grade is selected, the constant flow source assembly converts an external power source into constant currents and outputs the constant currents, and the discharge switch is connected to discharge and degauss when the output currents are larger than or equal to the degaussing current values or the capacitor is charged to reach a discharge voltage value. The constant current source is adopted as a degaussing power source and the charging power source of the capacitor, a quite stable constant magnetic field can be guaranteed to be generated, charge time is shortened, and wear and tear on the capacitor are reduced.

Description

technical field [0001] The invention belongs to the technical field of degaussing discharge equipment, in particular to a device and method for fast degaussing by using a program-controlled constant current source. Background technique [0002] Degaussing equipment is also called magnetic storage medium information degaussing machine (referred to as degaussing machine), which uses the powerful magnetic field caused by the discharge of the discharge coil to destroy the information stored in the magnetic storage medium. The magnetic field strength usually required is generally several thousand Oersted ; The degaussing machine can quickly and completely destroy all information stored in hard disks, tapes, floppy disks and magnetic cards, without physically destroying these storage media, and some storage media can be used again after degaussing. The purpose of degaussing can only be achieved if the degaussing machine provides a degaussing magnetic field of a certain strength, a...

AI Technical Summary

Problems solved by technology

The current degaussing equipment generally adopts the method of capacitor storage and discharge to obtain a certain strength of the degaussing magnetic field. Since the capacitor is charged in the way of ordinary power supply series resistance current limiting, there are problems such as long charging time, unstable charging current, and large initial moment. Current charging is easy to cause damage to the capacitor and other disadvantages

Images