CN203466004U - Program-controlled constant flow source demagnetization device - Google Patents
Program-controlled constant flow source demagnetization device Download PDFInfo
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- CN203466004U CN203466004U CN201320599749.3U CN201320599749U CN203466004U CN 203466004 U CN203466004 U CN 203466004U CN 201320599749 U CN201320599749 U CN 201320599749U CN 203466004 U CN203466004 U CN 203466004U
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Abstract
The utility model provides a program-controlled constant flow source demagnetization device which is composed of a constant flow source component, a capacitor, a discharge coil, a discharge switch and a control system component. The discharge switch is in series connection with the discharge coil before being in parallel connection with the constant flow source component and the capacitor. The control system component is connected with the constant flow source component, the discharge switch and the capacitor and monitors and controls the constant flow source component, the discharge switch and the capacitor. First, the control system presets a plurality of demagnetizing magnetic field intensity levels, a demagnetizing current value corresponding to each magnetic field intensity level, and a discharge voltage value of the capacitor; one magnetic field intensity level is selected, and then a demagnetizing program is started; the constant flow source component converts an external power source into a constant current, and the constant current is output; when the output current is greater than or equal to the demagnetizing current value or the capacitor is charged to reach the discharge voltage value, the discharge switch is turned on for discharge and demagnetization; the constant flow source is used as a demagnetizing power source and a capacitor charging power source, as a result, it can be guaranteed that a very stable constant magnetic field is produced, charge time is shortened, and loss of the capacitor is reduced.
Description
Technical field
The invention belongs to erasing discharge equipment technical field, particularly a kind of device that utilizes program controlled constant current source to carry out quick demagnetization.
Background technology
Deperming Facility also claims degausser, is the strong magnetic field of using discharge coil electric discharge moment initiation, and canned data in magnetic-based storage media is destroyed, and the magnetic field intensity conventionally needing 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 stable erasing field of strength of stability, could realize demagnetization object, and will shorten the erasing time as much as possible, reduces demagnetization energy consumption.The method that current Deperming Facility generally adopts capacitor to deposit discharge of electricity obtains the erasing field of strength of stability, be subject to the impact of the factor such as capacity, life-span of capacitor, the erasing field field intensity poor stability of this Deperming Facility, owing to adopting the mode of common power series resistance current limliting, it is capacitor charging, charging required time is long, the instantaneous large-current shortcomings such as damage that capacitor is caused easy to charge of beginning
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.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, control system assembly is connected with constant-current source assembly, discharge switch and capacitor, and to its monitoring and control; Constant-current source assembly can be converted into external power supply constant 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; Constant-current source assembly has galvanic output for being connected with capacitor, discharge coil; Constant-current source assembly has voltage sampling signal output to be connected with control system assembly, and to control system assembly feedback voltage sampled signal; Control pin in constant-current source assembly plays the on-off action that starts or stop output current, and it is connected with control system assembly and controlled by it.The input voltage of constant-current source assembly, is generally alternating current 220V.In constant-current source assembly, the effect of rectifier bridge is that by ac voltage rectifier be unidirectional pulsating voltage; The effect of electric capacity is the pulsating voltage after rectifier bridge rectification to carry out filtering, forms direct voltage; N-channel MOS pipe has on-off action, can, by the direct voltage copped wave on electric capacity, form the pulse voltage of certain duty ratio; Pulse width modulator (PWM) can decide according to the height of input signal the duty ratio of output pulse; Controlling pin effect is when low level, to guarantee that pulse width modulator output is normal, pulse width modulator no-output during high level, and now N-channel MOS pipe stops copped wave, and constant-current source is no-output; The effect of transformer is the output of the constant-current source of the pulse voltage transmission of N-channel MOS pipe copped wave; Diode can be direct voltage by pulse voltage rectification; Current sampling resistor is for sampling to output current; The effect of error amplifier is output current, voltage signal to amplify, and compares and enlarges with internal reference; After the voltage signal isolation that isolation feedback circuit forms after output current, voltage signal can being processed, pass to pulse width modulator.
Described control constant-current source degaussing gear presets autodegauss control program in control system assembly.
In described control system assembly, can preset 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 predetermined capacitive device prestores.In actual degaussing process, 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.
Described constant-current source assembly output current is more than or equal to erasing current value or capacitor charges while reaching discharge voltage value, and control system assembly is controlled and connected discharge switch, by discharge coil electric discharge demagnetization.The effect of constant-current source assembly output constant current is, both for the demagnetization of directly discharging, also used to capacitor and charged, if and do not close constant-current source assembly in capacitor discharge degaussing process, the constant 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.
Described program controlled constant current source degaussing gear, being further characterized in that when discharge switch is connected can temporary close constant-current source assembly, after demagnetization to be discharged finishes, more automatically opens constant-current source assembly, outwards delivered constant electric current.
Adopting constant-current source is capacitor charging, and the required charging interval, than directly short with the alternating current power supply charging time, can also reduce condenser loss simultaneously.Described program controlled constant current source degaussing gear, the predetermined capacitive device magnitude of voltage that prestores in control system, after electric discharge demagnetization finishes, can continue as capacitor by constant-current source assembly and charge, and reaches and while prestoring magnitude of voltage, closes constant-current source assembly again.Like this can pre-stored part electric weight, in required charging interval while shortening secondary erasing discharge, can greatly improve the operating efficiency of Deperming Facility.
Beneficial effect of the present invention is, can guarantee that discharge coil can produce highly stable stationary magnetic field; Reduce the use of capacitor, shorten the charging interval, improve demagnetization efficiency, reduce the destruction to capacitor, extend the life-span of capacitor.
Accompanying drawing explanation
Fig. 1 program controlled constant current source degaussing gear structural representation
Fig. 2 constant-current source assembly circuit figure
Embodiment
Fig. 1, Fig. 2 are a preferred embodiment of described program controlled constant current source degaussing gear, and program controlled constant current source degaussing gear comprises that constant-current source assembly 1, capacitor 2, discharge coil 3, discharge switch 5 and control system assembly 4 form described in Fig. 1; 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 constant 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 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 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 direct 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 in capacitor C 1, and pulse voltage is added on the former limit winding of transformer T1, through transformer T1, pulse voltage is delivered to the output of constant-current source, after the rectifying and wave-filtering of diode D1 and capacitor C 2, capacitor C 3, forms direct voltage Vo output.By current sampling resistor, R1 samples to output current, amplifies, and compare and enlarge with internal reference voltage by error amplifier 202 and 303 pairs of output current sampled signals of error amplifier.After 404 voltage sampling signal isolation that form after output current, voltage signal are processed of isolation feedback circuit, pass to pulse width modulator (PWM) 101.
The duty ratio of described transformer T1 pulse voltage is determined by the duty ratio 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 is during lower than setting voltage, current sampling signal Vv plays a major role, when output current is 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, increase output current, otherwise output duty cycle can diminish, by controlling the output duty cycle of pulse width modulator (PWM) 101, realized the constant of output current 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, in control system assembly, preset autodegauss control program, 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 control system assembly.While needing demagnetization, first select the erasing field intensity of certain grade, start autodegauss control program, control system is transferred erasing current value and the capacitor discharge magnitude of voltage corresponding with this magnetic field intensity grade automatically, and send instruction and open constant-current source assembly 1, output constant current; If the output current of constant-current source assembly 1 is more than or equal to 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 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 discharge voltage value, discharge switch 5 is connected, by discharge coil 3 electric discharge demagnetizations.
After electric discharge demagnetization finishes, discharge switch 5 disconnects, if need to continue demagnetization, 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, stop exporting constant current, then repeating aforementioned demagnetization action.If do not need to continue demagnetization, shutoff device.
Described program controlled constant current source degaussing gear, when capacitor 2 charging reaches discharge 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 delivered constant electric current.
Program controlled constant current source degaussing gear described in the present embodiment, can select as required applicable erasing field strength grade, control system Auto-matching erasing current value and capacitor discharge magnitude of voltage, and can 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 capacitor charging.
Claims (6)
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, control system assembly is connected with constant-current source assembly, discharge switch and capacitor, and to its monitoring and control; Constant-current source assembly can be converted into external power supply constant current output.
2. program controlled constant current source degaussing gear according to claim 1, is characterized in that 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; Constant-current source assembly has DC output end for being connected with capacitor, discharge coil; Constant-current source assembly has voltage sampling signal output to be connected with control system assembly, and to control system assembly feedback voltage sampled signal; Control pin in constant-current source assembly works the on-off action that starts or stop output current, and it is connected with control system assembly and controlled by it.
3. program controlled constant current source degaussing gear according to claim 2, is characterized in that presetting in control system assembly autodegauss control program.
4. program controlled constant current source degaussing gear according to claim 3, it is characterized in that can presetting some erasing field strength grades in 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 predetermined capacitive device prestores.
5. program controlled constant current source degaussing gear according to claim 4, it is characterized in that described constant-current source assembly output current is more than or equal to erasing current value or capacitor charges while reaching discharge voltage value, control system assembly is controlled and is connected discharge switch, by discharge coil electric discharge demagnetization.
6. program controlled constant current source degaussing gear according to claim 5, it is characterized in that when discharge switch is connected can temporary close constant-current source assembly, after demagnetization to be discharged finishes, more automatically opens constant-current source assembly, outwards delivered constant electric current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320599749.3U CN203466004U (en) | 2013-09-27 | 2013-09-27 | Program-controlled constant flow source demagnetization device |
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| CN201320599749.3U CN203466004U (en) | 2013-09-27 | 2013-09-27 | Program-controlled constant flow source demagnetization device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456315A (en) * | 2013-09-27 | 2013-12-18 | 北京方德信安科技有限公司 | Program-controlled constant flow source degaussing device and degaussing method |
| CN104112563A (en) * | 2014-08-13 | 2014-10-22 | 爱德森（厦门）电子有限公司 | Design and application method of alternating-current constant magnetic source |
| CN104142365B (en) * | 2014-08-13 | 2016-10-26 | 爱德森（厦门）电子有限公司 | The design of a kind of direct current perseverance magnetic source and using method |
-
2013
- 2013-09-27 CN CN201320599749.3U patent/CN203466004U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456315A (en) * | 2013-09-27 | 2013-12-18 | 北京方德信安科技有限公司 | Program-controlled constant flow source degaussing device and degaussing method |
| CN104112563A (en) * | 2014-08-13 | 2014-10-22 | 爱德森（厦门）电子有限公司 | Design and application method of alternating-current constant magnetic source |
| CN104112563B (en) * | 2014-08-13 | 2016-06-01 | 爱德森（厦门）电子有限公司 | A kind of designing and employing method exchanging Heng Ciyuan |
| CN104142365B (en) * | 2014-08-13 | 2016-10-26 | 爱德森（厦门）电子有限公司 | The design of a kind of direct current perseverance magnetic source and using method |
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