CN103456315A - Program-controlled constant flow source degaussing device and degaussing method - Google Patents
Program-controlled constant flow source degaussing device and degaussing method Download PDFInfo
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- CN103456315A CN103456315A CN2013104465906A CN201310446590A CN103456315A CN 103456315 A CN103456315 A CN 103456315A CN 2013104465906 A CN2013104465906 A CN 2013104465906A CN 201310446590 A CN201310446590 A CN 201310446590A CN 103456315 A CN103456315 A CN 103456315A
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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
The invention belongs to the erasing discharge equipment technical field, particularly a kind of apparatus and method of utilizing program controlled constant current source to carry out quick demagnetization.
Background technology
Deperming Facility also claims magnetic-based storage media information degausser (abbreviation degausser), it is the strong magnetic field of using discharge coil electric discharge moment initiation, canned data in magnetic-based storage media is destroyed, and the magnetic field intensity usually needed is generally at thousands of oersteds; Degausser can thoroughly be destroyed all information of the storages such as hard disk, tape, floppy disk and magnetic card fast, does not need physical property to destroy these storage mediums, after some storage medium demagnetizations, can also reuse.Degausser only provides the erasing field of some strength, could realize the demagnetization purpose, and will shorten as much as possible the time of whole demagnetization action, reduces the demagnetization energy consumption.The method that current Deperming Facility generally adopts capacitor to deposit discharge of electricity obtains the erasing field of some strength, because the mode that adopts common power resistance in series current limliting is the capacitor charging, there is the charging required time is long, charging current is unstable, start the instantaneous large-current shortcoming such as damage that capacitor is caused easy to charge.
Summary of the invention
In order to obtain the erasing field of strength of stability, minimizing being used and damaging capacitor, shortens the erasing time, improves erasure effect, the invention provides a kind of program controlled constant current source degaussing gear and demagnetization method.Described program controlled constant current source degaussing gear, is characterized in that being comprised of constant current source assembly, capacitor, discharge coil, discharge switch and control system assembly; After the series connection of discharge switch and discharge coil, then with constant current source assembly and Parallel-connected Capacitor, the control system assembly is connected with constant current source assembly, discharge switch and capacitor, and to its monitoring and control; The constant current source assembly can be converted into external power supply steady current output.
Described constant current source assembly comprises rectifier bridge, electric capacity, N-channel MOS pipe, pulse width modulator, control pin, transformer, diode, current sampling resistor, isolation feedback circuit, error amplifier; The constant current source assembly has galvanic output terminal for being connected with capacitor, discharge coil; The constant current source assembly has the voltage sampling signal output terminal to be connected with the control system assembly, and to control system assembly feedback voltage sampled signal; Control pin in the constant current source assembly plays the on-off action that starts or stop output current, and it is connected with the control system assembly and controlled by it.The input voltage of constant current source assembly, be generally alternating current 220V.In the constant current source assembly, the effect of rectifier bridge is that by ac voltage rectifier be unidirectional pulsating volage; The effect of electric capacity is the pulsating volage after the rectifier bridge rectification is carried out to filtering, forms DC voltage; The N-channel MOS pipe has on-off action, can, by the DC voltage copped wave on electric capacity, form the pulse voltage of certain dutycycle; Pulse width modulator (PWM) can decide according to the height of input signal the dutycycle of output pulse; Controlling the pin effect is to guarantee that when low level pulse width modulator output is normal, pulse width modulator no-output during high level, and now the N-channel MOS pipe stops copped wave, and constant current source is no-output; The effect of transformer is the output terminal of the constant current source of the pulse voltage of N-channel MOS pipe copped wave transmission; Diode can be DC voltage by the pulse voltage rectification; Current sampling resistor is for being sampled to output current; The effect of error amplifier is output current, voltage signal are amplified, and compares and enlarges with internal reference; Pass to pulse width modulator after the voltage signal isolation that isolation feedback circuit forms after output current, voltage signal can being processed.
Described control constant current source degaussing gear presets the autodegauss control program in the control system assembly.
Can preset some erasing field strength grades in described control system assembly, and corresponding erasing current value and the capacitor discharge magnitude of voltage of each magnetic field intensity grade, and the magnitude of voltage that can the predetermined capacitive device prestores.
Described program controlled constant current source demagnetization method, adopt aforementioned program controlled constant current source degaussing gear, it is characterized in that comprising the following steps:
The first step, in control system default erasing field strength grade, correspondence arranges erasing current value and capacitor discharge magnitude of voltage, and the capacitor magnitude of voltage that prestores is set;
Second step, startup degaussing gear, the control system assembly is started working;
The 3rd step, the autodegauss program that starts, control system is transferred default corresponding erasing current value and the capacitor discharge magnitude of voltage of magnetic field intensity grade automatically, and sends instruction and open the constant current source assembly, the output steady current;
If the output current of the 4th step constant current source assembly is more than or equal to the erasing current value, discharge switch is connected, by discharge coil electric discharge demagnetization; If the electric current of constant current source assembly output is less than the erasing current value, discharge switch is disconnected, and by the constant current source assembly, to capacitor, is charged, and when the voltage that is charged to capacitor reaches the sparking voltage value, discharge switch is connected, by discharge coil electric discharge demagnetization;
After the 5th step, electric discharge demagnetization finish, discharge switch disconnects;
If the 6th step needs to continue demagnetization, forward the 7th step to, if no longer continue demagnetization, forward the 8th step to;
The 7th step, constant current source assembly continue to the capacitor charging, and when reaching capacitor and prestoring magnitude of voltage, control system is closed the constant current source assembly, stops exporting steady current, then repeats the 3rd step to the five steps;
The 8th step, stopping device.
In the first step of described program controlled constant current source demagnetization method, can in control system, set in advance some erasing field strength grades, each magnetic field intensity grade correspondence is provided with erasing current value and capacitor discharge magnitude of voltage; In corresponding the 3rd step, before starting the autodegauss program, to first select an erasing field strength grade.Can select according to specific needs applicable erasing field strength grade, the power wastage of avoiding all demagnetizations to bring by a kind of field intensity in actual degaussing process.
Described constant current source demagnetization method is in the 4th step, and the capacitor charging reaches the sparking voltage value, can temporary close constant current source assembly when discharge switch is connected, after demagnetization to be discharged finishes, more automatically open the constant current source assembly, outwards the delivered constant electric current.
The effect of described constant current source assembly output steady current is, both for the demagnetization of directly discharging, also used to capacitor and charged, if and do not close the constant current source assembly in the capacitor discharge degaussing process, the steady current of constant current source assembly output plays supplementary function to capacitor discharge current, is conducive to obtain the erasing field of strength of stability.Adopting constant current source is the capacitor charging, and the required duration of charging, than directly short with the alternating current power supply charging time, can also reduce condenser loss simultaneously.
Described constant current source demagnetization method the 7th step capacitor pre-stored step, in required duration of charging in the time of can shortening the secondary erasing discharge, can improve the work efficiency of Deperming Facility greatly.
Beneficial effect of the present invention is, reduces the use of capacitor, shortens the duration of charging, improves demagnetization efficiency, reduces the damage to capacitor, extends the life-span of capacitor.
The accompanying drawing explanation
Fig. 1 program controlled constant current source degaussing gear structural representation
Fig. 2 constant current source assembly circuit figure
Fig. 3 program controlled constant current source demagnetization method schematic diagram
Embodiment
The preferred embodiment that Fig. 1, Fig. 2 are described program controlled constant current source degaussing gear, the described program controlled constant current source degaussing gear of Fig. 1 comprises that constant current source assembly 1, capacitor 2, discharge coil 3, discharge switch 5 and control system assembly 4 form; After discharge switch 5 and discharge coil 3 are first connected, more in parallel with constant current source assembly 1 and capacitor 2, control system assembly 4 is connected with constant current source assembly 1, discharge switch 5 and capacitor 2, and to its monitoring and control; Constant current source assembly 1 can be converted into external power supply steady current output.
Fig. 2 is constant current source assembly circuit figure, and the DC output end Vo of described constant current source assembly 1 is for being connected with discharge coil 3 with capacitor 2; Constant current source assembly 1 has voltage sampling signal output terminal Vv to be connected with control system assembly 4, and to control system assembly 4 feedback voltage sampled signal Vv; Control pin ON/OFF in the constant current source assembly plays the on-off action that starts or stop output current, and it is connected with control system assembly 4 and controlled by it.External power supply input ac voltage Vin becomes DC voltage after rectifier bridge BD and capacitor C 1 rectifying and wave-filtering, N-channel MOS pipe Q1 is pulse voltage as switch by the voltage chopping on capacitor C 1, and pulse voltage is added on the former limit winding of transformer T1, pulse voltage is delivered to the output terminal of constant current source through transformer T1, after the rectifying and wave-filtering of diode D1 and capacitor C 2, capacitor C 3, forms DC voltage Vo output.By current sampling resistor, R1 is sampled to output current, is amplified by error amplifier 202 and 303 pairs of output current sampled signals of error amplifier, and compares and enlarges with internal reference voltage.Pass to pulse width modulator (PWM) 101 after 404 voltage sampling signal isolation that form after output current, voltage signal are processed of isolation feedback circuit.
The dutycycle of described transformer T1 pulse voltage is determined by the dutycycle of the output pulse of pulse width modulator (PWM) 101, and the output pulse duty factor of pulse width modulator (PWM) 101 is decided by the sampled signal Vv of output current and voltage, when output voltage during lower than setting voltage, current sampling signal Vv plays a major role, when output current lower than setting electric current, the output pulse duty factor of pulse width modulator (PWM) 101 can strengthen, can offer so the more energy of transformer T1 and pass to output terminal, increase output current, otherwise output duty cycle can diminish, realized the constant of output current by the output duty cycle of controlling pulse width modulator (PWM) 101 like this.When output voltage reaches setting voltage, Voltage Feedback works, and constant current source becomes constant pressure source.The control signal of controlling pin ON/OFF can be controlled the whether output of pulse width modulator (PWM) 101, and when being high level, pulse width modulator (PWM) 101 is not exported, and N-channel MOS pipe Q1 does not work, and whole constant current source is in stopped status
Described program controlled constant current source degaussing gear, preset the autodegauss control program in the control system assembly, with a plurality of erasing field strength grades, each magnetic field intensity grade be to having erasing current value and capacitor discharge magnitude of voltage, in addition the predetermined capacitive device magnitude of voltage that prestores also in the control system assembly.
Described program controlled constant current source demagnetization method, adopt aforementioned program controlled constant current source degaussing gear, comprises the following steps:
The first step, in control system default a plurality of erasing field strength grades, and erasing current value and the capacitor discharge magnitude of voltage that each erasing field strength grade is corresponding is set, the capacitor magnitude of voltage that prestores is set simultaneously;
Second step, starter gear, control system assembly 4 is started working;
The 3rd step, select the erasing field intensity of certain grade, start the autodegauss program, control system is transferred erasing current value and the capacitor discharge magnitude of voltage corresponding with this magnetic field intensity grade automatically, and sends instruction and open constant current source assembly 1, the output steady current;
If the output current of the 4th step constant current source assembly 1 is more than or equal to the erasing current value, discharge switch 5 is connected, by discharge coil 3 electric discharge demagnetizations; If the electric current of constant current source assembly 1 output is less than the erasing current value, discharge switch 5 is disconnected, and by constant current source assembly 1, to capacitor 2 chargings, when the voltage that is charged to capacitor 2 reaches the sparking voltage value, discharge switch 5 is connected, by discharge coil 3 electric discharge demagnetizations;
After the 5th step, electric discharge demagnetization finish, discharge switch 5 disconnects;
If the 6th step needs to continue demagnetization, forward the 7th step to, if no longer continue demagnetization, forward the 8th step to;
The 7th step, constant current source assembly 1 continues to capacitor 2 chargings, and when reaching capacitor and prestoring magnitude of voltage, control system is closed constant current source assembly 1, stops exporting steady current, then repeats the 3rd step to the five steps;
The 8th step, stopping device.
In described constant current source demagnetization method the 4th step, when capacitor 2 charging reaches the sparking voltage value, can temporary close constant current source assembly 1 when discharge switch 5 is connected, after demagnetization to be discharged finishes, more automatically open constant current source assembly 1, outwards the delivered constant electric current.
The described program controlled constant current source degaussing gear of the present embodiment and demagnetization method, can select as required applicable erasing field strength grade, control system Auto-matching erasing current value and capacitor discharge magnitude of voltage, and but automatic decision and selection be directly to use the demagnetization of constant current source output current, still first to the demagnetization of discharging again after the capacitor charging.
Claims (7)
1. a program controlled constant current source degaussing gear, is characterized in that being comprised of constant current source assembly, capacitor, discharge coil, discharge switch and control system assembly; After the series connection of discharge switch and discharge coil, then with constant current source assembly and Parallel-connected Capacitor, the control system assembly is connected with constant current source assembly, discharge switch and capacitor, and to its monitoring and control; The constant current source assembly can be converted into external power supply steady current output.
2. program controlled constant current source degaussing gear according to claim 1, is characterized in that the constant current source assembly comprises rectifier bridge, electric capacity, N-channel MOS pipe, pulse width modulator, control pin, transformer, diode, current sampling resistor, isolation feedback circuit, error amplifier; The constant current source assembly has DC output end for being connected with capacitor, discharge coil; The constant current source assembly has the voltage sampling signal output terminal to be connected with the control system assembly, and to control system assembly feedback voltage sampled signal; Control pin in the constant current source assembly works the on-off action that starts or stop output current, and it is connected with the control system assembly and controlled by it.
3. program controlled constant current source degaussing gear according to claim 2, is characterized in that in the control system assembly presetting the autodegauss control program.
4. program controlled constant current source degaussing gear according to claim 3, it is characterized in that in the control system assembly presetting some erasing field strength grades, and corresponding erasing current value and the capacitor discharge magnitude of voltage of each magnetic field intensity grade, and the magnitude of voltage that can the predetermined capacitive device prestores.
5. a program controlled constant current source demagnetization method, right to use requires 4 described program controlled constant current source degaussing gears, it is characterized in that comprising the following steps:
The first step, in control system default erasing field strength grade, correspondence arranges erasing current value and capacitor discharge magnitude of voltage, and the capacitor magnitude of voltage that prestores is set;
Second step, startup degaussing gear, the control system assembly is started working;
The 3rd step, the autodegauss program that starts, control system is transferred default corresponding erasing current value and the capacitor discharge magnitude of voltage of magnetic field intensity grade automatically, and sends instruction and open the constant current source assembly, the output steady current;
If the output current of the 4th step constant current source assembly is more than or equal to the erasing current value, discharge switch is connected, by discharge coil electric discharge demagnetization; If the electric current of constant current source assembly output is less than the erasing current value, discharge switch is disconnected, and by the constant current source assembly, to capacitor, is charged, and when the voltage that is charged to capacitor reaches the sparking voltage value, discharge switch is connected, by discharge coil electric discharge demagnetization;
After the 5th step, electric discharge demagnetization finish, discharge switch disconnects;
If the 6th step needs to continue demagnetization, forward the 7th step to, if no longer continue demagnetization, forward the 8th step to;
The 7th step, constant current source assembly continue to the capacitor charging, and when reaching capacitor and prestoring magnitude of voltage, control system is closed the constant current source assembly, stops exporting steady current, then repeats the 3rd step to the five steps;
The 8th step, stopping device.
6. program controlled constant current source demagnetization method according to claim 5, is characterized in that in the first step, and can in control system, set in advance some erasing field strength grades, each magnetic field intensity grade correspondence is provided with erasing current value and capacitor discharge magnitude of voltage; In corresponding the 3rd step, before starting the autodegauss program, to first select an erasing field strength grade.
7. program controlled constant current source demagnetization method according to claim 5, it is characterized in that in the 4th step, the capacitor charging reaches the sparking voltage value, can temporary close constant current source assembly when discharge switch is connected, after demagnetization to be discharged finishes, automatically open again the constant current source assembly, outwards the delivered constant electric current.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11961648B2 (en) | 2019-10-21 | 2024-04-16 | Beijing University Of Technology | Rapid demagnetization method based on characteristics of magnetic media |
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| CN1163021A (en) * | 1994-11-11 | 1997-10-22 | 株式会社小松制作所 | DC-DC converter circuit and inductive load driver using it |
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Cited By (1)
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| US11961648B2 (en) | 2019-10-21 | 2024-04-16 | Beijing University Of Technology | Rapid demagnetization method based on characteristics of magnetic media |
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