CN203443919U - Weak magnetic inductor - Google Patents
Weak magnetic inductor Download PDFInfo
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- CN203443919U CN203443919U CN201320584317.5U CN201320584317U CN203443919U CN 203443919 U CN203443919 U CN 203443919U CN 201320584317 U CN201320584317 U CN 201320584317U CN 203443919 U CN203443919 U CN 203443919U
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Abstract
The utility model relates to a weak magnetic inductor which comprises a power module, a driver module, a resonance balanced circuit and a half-wave rectification amplifying circuit, wherein the power module provides voltage needed in work for the weak magnetic inductor; the driver module adopts any one programmable logic device of the ALTERA company, taking a CPLD as a core; square signals are obtained to be taken as drive signals needed in work of an RLC series resonance circuit by crystal oscillator frequency demultiplication through software programming; the resonance balanced circuit consists of the RLC series resonance circuit and a magnetic drive balance inductor; the output end of the resonance balanced circuit is connected with the half-wave rectification amplifying circuit; magnetic induction signal are outputted through the half-wave rectification amplifying circuit. The weak magnetic inductor is scientific and reasonable in design and simple in structure, has the characteristics of low power consumption, high integrated level, small size and high sensitivity, is applied to the field of magnetic detection, and can effectively induce the low-intensity magnetic field of a metal component of which the characteristic is reflected by stain and damage.
Description
Technical field
The utility model relates to a kind of sensor, particularly relates to a kind of weak magnetic inductor, the magnetic detection field that can be widely used in take weak magnetic be detected object.
Background technology
Along with the fast development of national economy and the raising of national awareness of safety, the safety issue of being brought by hardware flaw and damage is more and more subject to end user's attention, and the damage of hardware cannot with the naked eye be identified, traditional detection method mainly adopts active mode flaw detection, such as UT (Ultrasonic Testing), this kind of mode sensitivity is lower, and tested response signal noise is larger, cause measuring error larger, the trickle damage of None-identified metal.
Weak magnetic inductor is widely used in take the magnetic detection field that weak magnetic is detected object, in accurate remote sensing location, the vehicles are surveyed and ferromagnetic type member inspection technique is all widely used.At present, weak magnetic survey technology has been deep into the every field such as industry, agricultural, national defence, biology, medical science and Aero-Space.
Weak magnetic inductor is usingd amorphous metal as inductance core, application amorphous metal is very easily saturated and under critical state of saturation, have a larger variation magnetic permeability characteristic under extraneous magnetic fields, coil inductance its inductance value under tested magnetic field induction is more big changes, by this inductance and peripheral circuit mix proportion series resonant circuit, when having the axial external magnetic field of inductance to change, inductance value can sharply change, the acute variation that directly causes capacitance terminal voltage signal amplitude, be about to external magnetic field and be converted into electric signal, thereby effectively find out the variation of external magnetic field.
Utility model content
The utility model spatially shows the characteristic of fixed magnetic field according to hardware, design a kind of passive weak magnetic inductor, can go out hardware because of flaw and damage the characteristic low-intensity magnetic field showing by actual induction.
The technical scheme that the utility model adopts:
A kind of weak magnetic inductor, contain power module, driver module, resonant balanced circuit and half-wave rectification amplifying circuit, power module provides work required voltage for weak magnetic inductor, described driver module adopts any one programmable logic device (PLD) that CPLD is core of take of ALTERA company, by software programming, crystal oscillator is carried out to frequency division and obtain square-wave signal, as the required driving signal of RLC series resonant circuit work, resonant balanced circuit is comprised of RLC series resonant circuit and magnetic driven equilibrium inductance, described resonant balanced circuit output terminal connects half-wave rectification amplifying circuit, by half-wave rectification amplifying circuit output magnetic induction signal.
Described weak magnetic inductor, power module is comprised of synchronous buck converter QX3406, high-frequency switch capacity electric pressure converter TC1221 and peripheral passive element, for weak magnetic inductor provide the required voltage+3.3V of work and-3.3V.
Described weak magnetic inductor, half-wave rectification amplifying circuit comprises a follower and an integrated operational amplifier, resonant balanced circuit export resonance signal accesses integrated operational amplifier by follower, by integrated operational amplifier, exports magnetic induction signal.
Described weak magnetic inductor, in resonant balanced circuit, the inductance L 1 of RLC series resonant circuit and magnetic driven equilibrium inductance L 2 all form by usining the telefault of amorphous metal as magnetic core, axis parallel when L1 and L2 assembling, spacing is 3mm～5mm, for reducing the mutual inductance impact of L1 on L2, L2 coil turn will be far longer than L1 coil turn, and L2 non-crystalline metal magnetic core quantity also will be far away more than L1 coil magnetic core, and gross data parameter is by formula
determine, in formula, L-coil inductance, μ-magnetic permeability, the n-unit length number of turn, τ-winding volume.
Useful good effect of the present utility model:
1, the weak magnetic inductor of the utility model, design science is reasonable, highly sensitive, can go out hardware because of flaw and damage the characteristic low-intensity magnetic field showing by actual induction.What driver module adopted ALTERA company take CPLD as core devices, the integrated circuit that model is EPM3032ALC44, and the object of application CPLD is exactly can flexible configuration parameter, changes driving signal frequency.Once after the sizing of weak magnetic inductor, also can obtain driving frequency signal as counter or d type flip flop by discrete component, power consumption and volume that like this can weak magnetic inductor, be beneficial to the miniaturization of weak magnetic inductor.
2, the weak magnetic inductor of the utility model, power module is comprised of synchronous buck converter QX3406, high-frequency switch capacity electric pressure converter TC1221 and peripheral passive element, this power module can the external world compared with wide range input voltage in (2.5V～5.5V) for weak magnetic inductor provide the required voltage+3.3V of work and-3.3V, it has higher power supply energy conversion efficiency, can effectively reduce the power consumption of extraneous electric power system, this inductor is convenient on any equipment and instrument practical, is especially beneficial to the application in portable instrument system.
3, the weak magnetic inductor of the utility model, simple in structure, reasonable in design, has low in energy consumptionly, and integrated level is high, the feature that volume is little, highly sensitive.
Accompanying drawing explanation
Fig. 1: the weak magnetic inductor theory diagram of the utility model;
Fig. 2: the weak magnetic inductor power module circuitry schematic diagram of the utility model;
Fig. 3: the weak magnetic inductor resonant inductance structure principle chart of the utility model;
Fig. 4: the weak magnetic inductor driving circuit principle figure of the utility model;
Fig. 5: the weak magnetic inductor half-wave rectification amplifying circuit schematic diagram of the utility model.
Embodiment
Embodiment mono-: referring to Fig. 1, Fig. 4, the weak magnetic inductor of the utility model, contain power module, driver module, resonant balanced circuit and half-wave rectification amplifying circuit, power module provides work required voltage for weak magnetic inductor, described driver module adopts any one programmable logic device (PLD) that CPLD is core of take of ALTERA company, by software programming, crystal oscillator is carried out to frequency division and obtain square-wave signal, as the required driving signal of RLC series resonant circuit work, resonant balanced circuit is comprised of RLC series resonant circuit and magnetic driven equilibrium inductance, described resonant balanced circuit output terminal connects half-wave rectification amplifying circuit, by half-wave rectification amplifying circuit output magnetic induction signal.
As shown in Figure 4, the programmable logic device (PLD) model that in the present embodiment, driver module adopts is EPM7032(or adopts EPM3032ALC44), by software programming, crystal oscillator is carried out frequency division and then obtains square-wave signal, as the required driving signal of RLC series resonant circuit work, inductance and the electric capacity of this signal frequency amorphous magnetic core coil in series circuit determines,
, signal frequency can obtain through debugging by using signal generator output signal as driving signal in advance, after circuit parameter is determined, can determine the frequency division parameter of CPLD, and the object of application CPLD is exactly can flexible configuration parameter, changes driving signal frequency.Once after the sizing of weak magnetic inductor, also can obtain driving frequency signal as counter or d type flip flop by discrete component, power consumption and volume that like this can weak magnetic inductor, be beneficial to the miniaturization of weak magnetic inductor.
Embodiment bis-: referring to Fig. 2, the weak magnetic inductor of the present embodiment, different from embodiment mono-: power module is comprised of synchronous buck converter QX3406, high-frequency switch capacity electric pressure converter TC1221 and peripheral passive element, for weak magnetic inductor provide the required voltage+3.3V of work and-3.3V.This power module can the external world compared with wide range input voltage in (2.5V～5.5V) for weak magnetic inductor provide the required voltage+3.3V of work and-3.3V, it has higher power supply energy conversion efficiency, can effectively reduce the power consumption of extraneous electric power system, this inductor is convenient on any equipment and instrument practical, is especially beneficial to the application in portable instrument system.
Embodiment tri-: the weak magnetic inductor of the present embodiment, different from embodiment mono-or embodiment bis-, the resonant balanced circuit structured flowchart of employing as shown in Figure 3.Resonant balanced circuit is comprised of RLC series resonant circuit and magnetic driven equilibrium inductance, and the inductance L 1 of RLC series resonant circuit and magnetic driven equilibrium inductance L 2 all form by usining the telefault of amorphous metal as magnetic core.
In Fig. 3, label 1 is non-crystalline metal magnetic core, and 2 is coil rack, and 3 is enameled wire loop.It is 3mm～5mm that L1 and L2 need axis parallel, spacing when assembling.L2 produces balance magnetic field under the driving of peripheral DC voltage makes L1 reach critical state of saturation.
For reducing the mutual inductance impact of L1 on L2, L2 coil turn will be far longer than L1 coil turn, and L2 amorphous magnetic core quantity also will be far away more than L1 coil magnetic core.Gross data parameter is by formula is definite below.
In formula (1): L-coil inductance, μ-magnetic permeability, the n-unit length number of turn, τ-winding volume.
For eliminating the parasitic current of resonant circuit, disturb, need to adopt and regularly switch L2 drive current direction mode L2 energising.
The weak magnetic inductor of the utility model, the amplitude voltage signal of the sign external magnetic field that resonant circuit induces is the AC signal without DC component, for ease of signals collecting, this AC signal need to be converted into true amplitude voltage signal, because we are only concerned about the amplitude of this signal, so can adopt half-wave rectification signal to realize this function.Theory diagram as shown in Figure 5.Half-wave rectification amplifying circuit comprises a follower and an integrated operational amplifier, and resonant balanced circuit export resonance signal accesses integrated operational amplifier by follower, by integrated operational amplifier, exports magnetic induction signal.
For making weak magnetic inductor reach optimum Working, first, need to improve the quality factor of resonant circuit as far as possible, but raising quality factor that can not be simply, in order to avoid damage circuit, therefore the utility model has adopted the programmable logic device (PLD) that CPLD is core of take of ALTERA company, by software programming, crystal oscillator is carried out to frequency division and obtains square-wave signal, as the required driving signal of RLC series resonant circuit work; Secondly, for allowing telefault be operated in critical state of saturation, the utility model implementation method be with one with it the telefault of parallel same structure as extraneous driven equilibrium magnetic field, make small coil reach critical state of saturation, the balance magnetic field telefault number of turn will be far longer than the resonant circuit telefault number of turn, and non-crystalline metal magnetic core quantity also will be far away more than resonant circuit telefault magnetic core.
Claims (5)
1. magnetic inductor a little less than a kind, contain power module, driver module, resonant balanced circuit and half-wave rectification amplifying circuit, power module provides work required voltage for weak magnetic inductor, it is characterized in that: described driver module adopts any one programmable logic device (PLD) that CPLD is core of take of ALTERA company, by software programming, crystal oscillator is carried out to frequency division and obtain square-wave signal, as the required driving signal of RLC series resonant circuit work, resonant balanced circuit is comprised of RLC series resonant circuit and magnetic driven equilibrium inductance, described resonant balanced circuit output terminal connects half-wave rectification amplifying circuit, by half-wave rectification amplifying circuit output magnetic induction signal.
2. weak magnetic inductor according to claim 1, it is characterized in that: power module is comprised of synchronous buck converter QX3406, high-frequency switch capacity electric pressure converter TC1221 and peripheral passive element, for weak magnetic inductor provide work required+3.3V and-3.3V voltage.
3. weak magnetic inductor according to claim 1 and 2, it is characterized in that: half-wave rectification amplifying circuit comprises a follower and an integrated operational amplifier, resonant balanced circuit export resonance signal accesses integrated operational amplifier by follower, by integrated operational amplifier, exports magnetic induction signal.
4. weak magnetic inductor according to claim 3, it is characterized in that: in resonant balanced circuit, the inductance L 1 of RLC series resonant circuit and magnetic driven equilibrium inductance L 2 all form by usining the telefault of amorphous metal as magnetic core, axis parallel when inductance L 1 and L2 assembling, spacing is 3mm～5mm, for reducing the mutual inductance impact of inductance L 1 on magnetic driven equilibrium inductance L 2, magnetic driven equilibrium inductance L 2 coil turns are far longer than inductance L 1 coil turn, magnetic driven equilibrium inductance L 2 non-crystalline metal magnetic core quantity are also far away more than inductance L 1 coil magnetic core, gross data parameter is by formula
determine, in formula, L-coil inductance, μ-magnetic permeability, the n-unit length number of turn, τ-winding volume.
5. weak magnetic inductor according to claim 1 and 2, it is characterized in that: in resonant balanced circuit, the inductance L 1 of RLC series resonant circuit and magnetic driven equilibrium inductance L 2 all form by usining the telefault of amorphous metal as magnetic core, axis parallel when inductance L 1 and 2 assembling of magnetic driven equilibrium inductance L, spacing is 3mm～5mm, for reducing the mutual inductance impact of inductance L 1 on magnetic driven equilibrium inductance L 2, magnetic driven equilibrium inductance L 2 coil turns are far longer than inductance L 1 coil turn, magnetic driven equilibrium inductance L 2 non-crystalline metal magnetic core quantity are also far away more than inductance L 1 coil magnetic core, gross data parameter is by formula
determine, in formula, L-coil inductance, μ-magnetic permeability, the n-unit length number of turn, τ-winding volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320584317.5U CN203443919U (en) | 2013-09-23 | 2013-09-23 | Weak magnetic inductor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320584317.5U CN203443919U (en) | 2013-09-23 | 2013-09-23 | Weak magnetic inductor |
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| CN203443919U true CN203443919U (en) | 2014-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320584317.5U Expired - Fee Related CN203443919U (en) | 2013-09-23 | 2013-09-23 | Weak magnetic inductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117335785A (en) * | 2023-12-01 | 2024-01-02 | 无锡弘宜智能科技股份有限公司 | Novel weak magnetism detects device |
-
2013
- 2013-09-23 CN CN201320584317.5U patent/CN203443919U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117335785A (en) * | 2023-12-01 | 2024-01-02 | 无锡弘宜智能科技股份有限公司 | Novel weak magnetism detects device |
| CN117335785B (en) * | 2023-12-01 | 2024-01-26 | 无锡弘宜智能科技股份有限公司 | Novel weak magnetism detects device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140219 Termination date: 20140923 |
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| EXPY | Termination of patent right or utility model |