CN107105374B - It is a kind of to weaken a point electroacoustic transducer for vibration phenomenon - Google Patents
It is a kind of to weaken a point electroacoustic transducer for vibration phenomenon Download PDFInfo
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- CN107105374B CN107105374B CN201710287749.2A CN201710287749A CN107105374B CN 107105374 B CN107105374 B CN 107105374B CN 201710287749 A CN201710287749 A CN 201710287749A CN 107105374 B CN107105374 B CN 107105374B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
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Abstract
It is a kind of to weaken a point electroacoustic transducer for vibration phenomenon, due to being provided with magnetic circuit system and vibrational system in shell, it is configured to weaken a point electroacoustic transducer for vibration phenomenon.It under the magneticaction of magnetic circuit system, is suspended in the vibrating spindle of vibrational system in the air, and makes vibrating spindle that can be in stable equilibrium state always.Being formed between vibrating spindle and magnetic suspension bearing does not have Mechanical Contact.Between vibrating spindle and magnetic suspension bearing, not only without mechanical friction, but also contactless abrasion, a point generation for vibration phenomenon can be effectively prevented from.Weaken a point vibration effect with good.To protect.Demonstrate,prove electroacoustic transducer acoustical sound.
Description
It is a kind of to weaken a point electroacoustic transducer for vibration phenomenon.
Technical field
The present invention relates to a kind of electroacoustic transducers, especially a kind of to weaken a point electroacoustic transducer for vibration phenomenon.It is suitable
Industry is played for audio.
Background technique
There are many kinds of loudspeaker classification, and wherein cone formula is applied relatively broad, and low cost, circuit is simple, this kind of to raise
Sound device can accomplish that performance is substantially excellent, can obtain uniform frequency response in Mid Frequency.But existing cone formula loudspeaker is deposited
In a problem, in voice coil drive cone vibration processes, a point vibration phenomenon can be generated, that is, cone middle section and edge occurs
Partial vibration frequency is different, generates noise.
Summary of the invention
The purpose of the present invention is to provide one kind can weaken a point electroacoustic transducer for vibration phenomenon, it can overcome oneself to have skill
Vibrating shaft is suspended in the air by the deficiency of art using the magneticaction of magnetic bearing, makes not having between vibrating shaft and magnetic bearing
Mechanical Contact has the characteristics that no mechanical friction, contactless abrasion, can be effectively prevented from phenomenon of point shaking.
Its solution is: being provided with magnetic circuit system and vibrational system in shell, is configured to weaken point vibration phenomenon
Electroacoustic transducer.Under the magneticaction of magnetic circuit system, it is suspended in the vibrating spindle of vibrational system in the air, and make vibrating spindle
Always stable equilibrium state can be in.No mechanical friction, contactless abrasion can effectively avoid a point generation for vibration phenomenon.
The vibrational system is connected separately with vibration on the support base by the support base that connect and be arranged symmetrically with shell
Sound piece is provided with magnetic suspension bearing connected to the housing between chatter piece, wears and is connected to and chatter piece in magnetic suspension bearing
Connected vibrating spindle, vibrating spindle and chatter piece are linked together the sonification system for constituting electroacoustic transducer, and lead with vibration
It is provided with magnetic substance in the corresponding inner walls of axis and constitutes, arrangement magnetic suspension bearing circuit is provided on magnetic suspension bearing
Magnetic suspension circuit board, turn acoustical signal circuit board in being provided with arrangement electric signal on vibrating shaft and turning the electric signal of acoustical signal circuit.
The magnetic circuit system includes that magnetic suspension bearing circuit and electric signal turn acoustical signal circuit, this two parts circuit is only each other
It is vertical.
The magnetic suspension bearing circuit includes displacement sensor circuit, signal reason tune circuit, power circuit, power amplifier
Circuit, PWM wave generative circuit, current sensor circuit, controller circuitry.Connection relationship between them is: displacement sensor
Circuit is connected in series signal reason and adjusts circuit, then digital signal processing circuit (DSP), digital signal processing circuit is connected in series
(DSP) controller circuitry is connected in series in output end.Meanwhile controller circuitry is also connected in series in current sensor circuit, then goes here and there
Power circuit is connected in series in connection connection PWM wave generative circuit, differential output to power amplifier circuit, power amplifier circuit.
Described displacement sensor circuit is differential capacitor displacement sensor circuit, including conversion circuit, detection circuit, phase shift
Device circuit and low-pass filter circuit；The capacitor C1-1 and C1-2 that conversion circuit is made of three pieces of pole plates connect with transformer and
It constitutes, the change of the transformer output voltage in power circuit is determined by the transformation of the capacitor plate positional shift of conversion circuit
It changes；Detection circuit is connected by four diodes D1-1, D1-2, D1-3 and D1-4 and is constituted, detection circuit output voltage only with turn
The capacitance voltage changed in circuit is related, and positive and negative by detection circuit output voltage judges the capacitor plate in conversion circuit
Shift transformation；Phase shifter circuit, which is connected by advanced phase shifter circuit with lag phase shifter circuit, to be constituted, and phase shifter circuit can make defeated
The node voltage for entering signal changes phase, and the range for changing phase is -180 ° to 180 °；Low-pass filter circuit by resistance R1-3,
Capacitor C1-3 is constituted, can by low-pass filter circuit since the voltage of detection circuit output includes DC component and high fdrequency component
Required DC component is obtained to filter out each harmonic component.
Described signal reason adjust circuit by low-pass filter circuit, follower circuit, adjust slide rheostat, subtraction circuit and
Two-stage amplifier composition；The High-frequency Interference of displacement sensor circuit output is filtered out by low-pass filter circuit and follower circuit
Signal carries out impedance transformation by follower circuit later, then is subtracted by subtraction circuit and obtained by adjusting slide rheostat
Want voltage.
Described power circuit is connected with filter circuit and is constituted by power transformer, rectification circuit, by power transformer
Alternating current is generated, alternating current is switched to the Rectified alternating current with direct current ingredient by rectification circuit, then, through filter circuit
Alternating component in pulsating direct current is filtered out, reduction flip-flop, ingredient of increasing exchanges, to reduce the ripple of DC voltage, and
Filter out High-frequency Interference；
Described power amplifier circuit by power main circuit, overcurrent protection circuit and overcurrent protection latching circuit phase
It connects and constitutes, if overcurrent occurs in circuit, fault-signal is exported by power main circuit, grid are avoided by overcurrent protection circuit
There is the phenomenon that overvoltage in pole and emitter-base bandgap grading, when over-current signal output, are realized by the latching circuit of overcurrent protection to PWM wave
The PWM wave that generative circuit generates is self-locking；
Described PWM wave generative circuit is the Switching Power Supply integrated manipulator being made of 3524 integrated circuits, oscillator, external
Capacitor C6-1 and slide rheostat W2, PI controller constitute, when input voltage increase when, 3524 integrated circuits output rectangle
Pulse narrowing；When input voltage reduces, the rectangular pulse of 3524 integrated circuits output broadens, and can be stabilized the output voltage.
Described current sensor circuit is made of magnetic core and Hall element.The magnetic flux that periphery electric current generates is by the magnetic of high-quality
Core is assembled in this road, and Hall element is fixed in a small gap, carries out linearity test to magnetic flux, Hall element output
Hall voltage is after special circuit is handled, and secondary side, which exports, and primary side waveform is consistent follows output voltage, this voltage can be accurate
Reflect the variation of primary current.
Described controller circuitry by first voltage follower U5A, resistance and ground capacity, amplifier, slide rheostat and
Ground resistance, digital analog converter (D/A), second voltage follower U1A, subtracter U2A and pi regulator are constituted.
The pin 3 of the voltage access first voltage follower U5A exported from current sensor, by first voltage follower
U5A output, plays impedance matching, after filtering high fdrequency component using resistance R5-10 and ground capacity C5-3, passes through amplifier
U4A amplification, magnification ratio is determined by the value of slide rheostat W and ground resistance R5-9, using D/A converting circuit (D/
A) output voltage after progress digital-to-analogue conversion, which first passes through resistance R5-10 and ground capacity C5-3 filters out high fdrequency component,
Then given voltage is obtained by second voltage follower U1A, by the given voltage and that portion obtained from current sensor
Component voltage inputs subtracter U2A, obtains deviation voltage, which carries out proportional integration operation by pi regulator, and protects
Demonstrate,prove the feedback quantity and specified rate phase of controlled device.
It is the LM4871 chip amplifier using 8 pin packages that the electric signal, which turns acoustical signal circuit, turns off end pin 1
It is connected by selection switch ground connection, or through resistance R1 with power supply VCC, voltage reference end pin 2 is grounded by capacitor Cb, same to phase
Input terminal pin 3 meets input audio signal (Audio Input) by capacitor Cb, resistance R2 and capacitor Ci, and reverse input end draws
Foot 4 is connected to volume by resistance R5 and exports one end pin 5, and volume exports one end pin 5 and volume exports the access of two end pins 8 and bears
It carries, power end pin 6 is powered using single supply, and in power end to external capacitor Cs between ground, filters the high-frequency ac of power supply
Ingredient, ground terminal pin 7 are directly grounded.
When input audio signal is added to through capacitor Ci and resistance R2 the non-inverting input terminal pin 3 of amplifier, reverse input end
Pin 4 is connected to volume by resistance R5 and exports one end pin 5, shutdown end pin 1 by selection switch ground connection or and power supply with
And resistance R1 is connected, voltage reference end pin 2 is by capacity earth, and to filter out high frequency ripple interference, power end pin 6 is using single
Power supply power supply.
The present invention by adopting the above technical scheme, due to being provided with magnetic circuit system and vibrational system in shell, is configured to
Weaken a point electroacoustic transducer for vibration phenomenon.Vibrational system is by the support base that connect and be arranged symmetrically with shell, on the support base
It is connected separately with chatter piece, magnetic suspension bearing connected to the housing is provided between chatter piece, is worn in magnetic suspension bearing
Be connected to the vibrating spindle being connected with chatter piece, vibrating spindle and chatter piece are linked together composition sonification system, and with vibration
It is provided with magnetic substance composition in the corresponding inner walls of main shaft, magnetic suspension bearing circuit plate is provided on magnetic suspension bearing,
Turn acoustical signal circuit board in being provided with electric signal on vibrating spindle.Under the magneticaction of magnetic circuit system, make the vibration of vibrational system
Dynamic main shaft is suspended in the air, makes do not have Mechanical Contact between vibrating spindle and magnetic suspension bearing.Due to the line of magnetic induction and magnetic flotation line
At vertical, vibrating spindle is parallel with magnetic flotation line, so the weight of vibrating shaft is secured on the track of operating, using almost
It is that non-loaded vibrating spindle is shored toward anti-magnetic flotation line direction, it is hanging forms entire vibrating spindle.With electromagnet and power amplification
Device two parts actuator.Assuming that vibrating spindle, on reference position, the vibrating spindle disturbance downward by one can deviate from it
Reference position, at this moment sensor detects that vibrating spindle deviates the displacement of reference point, and the microprocessor as controller will test
Shift transformation at control signal.Then this control signal is converted into control electric current by power amplifier, and control electric current is being held
Magnetic force is generated in row magnet, to drive vibrating spindle back to original equilbrium position.Therefore, no matter vibrating spindle is by downward
Or upward disturbance, vibrating spindle can be in stable equilibrium state always.Between vibrating spindle and magnetic suspension bearing, both without
Mechanical friction, and contactless abrasion can effectively avoid a point generation for vibration phenomenon.Weaken a point vibration effect with good.To guarantee
Electroacoustic transducer acoustical sound.
Detailed description of the invention
Fig. 1 is that one kind can weaken a point structural representation front sectional view for the electroacoustic transducer of vibration phenomenon.
Fig. 2 is the A-A cross-sectional view in Fig. 1.
Fig. 3 is the system composition schematic diagram that one kind can weaken point electroacoustic transducer of vibration phenomenon.
Fig. 4 is System Working Principle schematic diagram.
Fig. 5 is the magnetic levitation bearing system electric operation control circuit figure of magnetic circuit control system.
Fig. 6 is that the electric signal of magnetic circuit control system turns acoustical signal electric operation control circuit figure.
Specific embodiment
It describes the specific embodiments of the present invention in detail with reference to the accompanying drawing.
Fig. 1 is provided with magnetic circuit system and vibrational system in shell 11 into Fig. 6, is configured to weaken point vibration phenomenon
Electroacoustic transducer.
The vibrational system is by being inserted into the left support for being located at and in shell 11 and being flexibly connected and be arranged symmetrically with shell 11
Support 4 and right support support 6 are respectively arranged with the chatter piece 5 connected with them in left support support 4 and right support support 6,
It is provided with the magnetic suspension bearing 3 connecting with shell 11 between two chatter pieces 5, is worn in magnetic suspension bearing 3 and is connected to and vibrates
The vibrating spindle 1 that sound piece 5 is connected, vibrating spindle 1 and chatter piece 5 are linked together the sonification system for constituting vibrational system, and
It is fixed with magnetic magnet body 9 on 11 inner wall of shell corresponding with 1 both ends of vibrating spindle and constitutes, set on magnetic suspension bearing 3
It is equipped with magnetic suspension circuit board 10.Magnetic suspension bearing circuit is disposed on the magnetic suspension circuit board 10.It is provided on vibrating spindle 1
The electric signal that arrangement electric signal turns acoustical signal circuit turns acoustical signal circuit board 8.
Under the magneticaction of magnetic circuit system, the central spindle for making the vibrating spindle 1 of vibrational system be suspended in magnetic suspension bearing 3 is empty
In, there is no Mechanical Contact between vibrating spindle 1 and magnetic suspension bearing 3.Due to the line of magnetic induction with magnetic flotation line at vertical, vibrating spindle
1 with magnetic flotation line is parallel, so the weight of vibrating spindle 1 is secured on the track of operating, using almost non-loaded
Vibrating spindle 1 is shored toward anti-magnetic flotation line direction, forces entire vibrating spindle 1 hanging.And with magnetic magnet body 9 and power amplifier
Two parts are actuator.If vibrating spindle 1, on reference position, the disturbance downward by one of vibrating spindle 1 can deviate from
Its reference position, at this moment sensor detects that vibrating spindle 1 deviates the displacement of reference point, and the microprocessor as controller will be examined
The shift transformation of survey is at control signal.Then this control signal is converted into control electric current by power amplifier, and control electric current exists
It executes in magnet and generates magnetic force, to drive vibrating spindle 1 back to original equilbrium position.Therefore, though vibrating spindle 1 by
Disturbance downward or upward, vibrating spindle 1 can be in stable equilibrium state always.Vibrating spindle 1 and magnetic suspension bearing 3 it
Between, not only without mechanical friction, but also contactless abrasion, it can effectively avoid a point generation for vibration phenomenon.Weaken a point vibration effect with good.
The magnetic circuit system includes that magnetic suspension bearing circuit and electric signal turn acoustical signal circuit, this two parts circuit is only each other
It is vertical.Magnetic suspension bearing circuit includes displacement sensor circuit 12, signal reason tune circuit 13, current sensor circuit 17, controller
Circuit 18, PWM wave generative circuit 16, power amplifier circuit 15, power circuit 14 and digital signal processing circuit (DSP).This
Connection relationship between several partial circuits is: displacement sensor circuit 12 is connected in series signal reason and adjusts circuit 13, then is connected in series
Controller circuitry 18 is connected in series in the output end of digital signal processing circuit (DSP), digital signal processing circuit (DSP).Meanwhile
Controller circuitry 18 is also connected in series in current sensor circuit 17, then PWM wave generative circuit 16 is connected in series, differential output to function
Rate amplifier circuit 15, power amplifier circuit 15 and power circuit 14 are connected in series.
Described displacement sensor circuit 12 is differential capacitor displacement sensor circuit, and the circuit is by conversion circuit, detection electricity
Road, phase-shift circuit and low-pass filter circuit composition.
Conversion circuit is to be connect with transformer by capacitor C1-1 and C1-2 and constituted.And capacitor C1-1 and C1-2 by it is left,
In, right three pieces of pole plates composition.In transformer and capacitor middle plate measurement voltage, if capacitor middle plate is in the left pole plate of capacitor
With the middle position of the right pole plate of capacitor, voltage zero；If capacitor middle plate is subjected to displacement, voltage difference will be generated, thus
Determine shift transformation.The transformation of transformer output voltage is determined by the transformation of capacitor plate positional shift, determines that displacement becomes
The relational expression changed are as follows: U0=(△ d/d) Ui, in formula: U0 is output voltage values, and △ d is displacement variable, and d is initial displacement
Value, Ui is input voltage value.Output voltage and capacitor plate positional shift are in a linear relationship.
Detection circuit is connected by four diodes D1-1, D1-2, D1-3 and D1-4 and is constituted.When capacitor in conversion circuit
When the intermediate capacitance pole plate non-displacement of C1-1 and C1-2, conversion circuit output voltage is zero, and detection circuit output voltage is only at this time
It is related with the capacitance voltage in conversion circuit, when the capacitance voltage in conversion circuit is in positive half period, diode D1-1 and D1-
2 conductings, diode D1-3 and D1-4 end；When the capacitance voltage in conversion circuit is in negative half-cycle, diode D1-1 and D1-
2 cut-offs, diode D1-3 and D1-4 conducting, detection circuit output voltage zero can be made by adjusting slide rheostat.When conversion electricity
Intermediate capacitance pole plate in road is to when left dislocation, and conversion circuit output voltage is not equal to zero, and detection circuit output voltage is defeated by its
It the capacitance voltage collective effect in voltage and conversion circuit and is positive always out；When the intermediate capacitance pole plate in conversion circuit to the right
When displacement, detection circuit output voltage is negative always, therefore can be by the positive and negative electric to judge to convert of detection circuit output voltage
The shift transformation of intermediate capacitance pole plate in road.
Phase-shift circuit, which is connected by advanced phase shifter with lag phase shifter, to be constituted.The advanced phase shifter by first stage amplifier with
Level-one capacitor C2-1, three stage resistives R2-1 and R2-2, R2-3 and level-one slide rheostat Rp1 composition: when the level-one of input
When there was only DC component in the node voltage of resistance R2-1 and level-one capacitor C2-1, level-one capacitor C2-1 is equivalent to open circuit, i.e., electric
Resistance is very big, at this point, the node electricity of the stage resistive R2-1 and level-one capacitor C2-1 of the resistance R2-5 right end voltage and input of output
Same phase is pressed, the resistance R2-5 right end voltage phase shift of output is 0 °；When the knot of the stage resistive R2-1 and level-one capacitor C2-1 of input
When having very high high fdrequency component in point voltage, level-one capacitor C2-1 is equivalent to short circuit, i.e. resistance very little, and the resistance R2-5 of output is right
180 ° of voltage phase shift of end, the value of adjustable level-one slide rheostat Rp1 make the stage resistive R2-1 and level-one capacitor of input
The range that the node voltage of C2-1 changes phase is 0 ° to 180 °.The lag phase shifter is by two-stage amplifier and second level capacitor
C2-2, three second level resistance R2-4 and R2-5, R2-6 and second level slide rheostat Rp1 composition.As the stage resistive R2-1 of input
When with there was only DC component in the node voltage of level-one capacitor C2-1, second level capacitor C2-2 is equivalent to open circuit, i.e., resistance is very big, defeated
The node voltage reverse phase of the stage resistive R2-1 and level-one capacitor C2-1 of resistance R2-5 right end voltage and input out, then export
Resistance R2-5 right end voltage phase shift is -180 °；When there is very high high fdrequency component in input voltage, second level capacitor C2-2 is equivalent to
Short circuit, i.e. resistance very little, the knot of the resistance R2-5 right end voltage of output and the stage resistive R2-1 of input and level-one capacitor C2-1
Point arc in phase, the resistance R2-5 right end voltage phase shift of output are 0 °, adjust the value of second level slide rheostat Rp2 to change phase
Range be 0 ° Dao -180 °.Advanced phase shifter is connected with lag phase shifter two-stage constitutes the phase shift electricity of -180 ° to 180 ° ranges
Road.
Low-pass filter circuit is made of resistance R1-3, capacitor C1-3, can be filtered out by low-pass filter circuit by detecting
DC component included in the voltage of circuit output and each harmonic component of high fdrequency component, and obtain required DC component.
Signal reason adjust circuit 13 include be made of resistance R3-4 and capacitor C3-2 signal condition low-pass filter circuit, with
With device circuit, adjust slide rheostat, subtraction circuit and two-stage amplifier composition.The output electricity of differential capacitor displacement sensor
It is pressed with certain range, A/D input signal also has certain range, manages by signal and adjusts circuit 13 to meet analog-to-digital conversion electricity
The requirement of road (A/D) input.Since the output voltage of differential capacitor displacement sensor contains high fdrequency component, pass through the low pass filtered
Wave circuit and follower circuit filter out the high-frequency interferencing signal of differential capacitor displacement sensor, later, through follower circuit into
Row impedance transformation, the output resistance very little of the follower circuit, then output voltage can be added in the subtraction connected below completely
On device circuit.It is available desired by adjusting slide rheostat before output voltage is added on subtraction circuit completely
Voltage, and after subtracting the voltage by subtraction circuit, obtained voltage is applied to progress impedance transformation on follower circuit.
By power transformer, rectification circuit is connected with filter circuit and constitutes the power circuit 14.First by power supply
Transformer generates alternating current, alternating current is switched to the Rectified alternating current with direct current ingredient by rectification circuit, then, through filtering
Wave circuit filters out the alternating component in pulsating direct current, reduces flip-flop, ingredient of increasing exchanges, wherein C1 is that capacity is big, resistance to
Pressure is worth high electrolytic capacitor, it is possible to reduce the ripple of DC voltage, capacitor C2 are that pressure voltage is high, the good metallization electricity of high frequency
Hold, High-frequency Interference can be filtered out.
The power amplifier circuit 15 by power main circuit, overcurrent protection circuit and overcurrent protection latching circuit
It is connected and constitutes.Power main circuit uses semibridge system structure, using EXB841 chip as driving circuit, has single supply, just
Back bias voltage, over-current detection, protection, the key properties such as soft switching.Overcurrent protection circuit is by EXB841 chip, Schottky diode
D7-10, D7-12, D7-13, D7-15, general-purpose diode D7-11, D7-14, capacitor C7-4, three resistance R7-12, R7-13,
R7-14 and silicon-controlled IGBT composition.The latching circuit of overcurrent protection is by photoisolator (Optoisolator2), triode
Q7-3, Q7-4, capacitor C7-3, three resistance R7-8, R7-9, R7-11 and controllable silicon SCR 1 form.Wherein general-purpose diode D7-
The effect of 14 and Schottky diode D7-13 is that grid and emitter-base bandgap grading is avoided the phenomenon that overvoltage, Schottky diode D7-12 occur
It can shield, avoid the foot 6 of EXB841 chip from bearing overvoltage, overcurrent is detected whether by general-purpose diode D7-9,
Change EXB841 chip overcurrent protection by general-purpose diode D7-11 to start to control a little.After overcurrent, 5 feet of EXB841 chip
The base stage of triode Q7-3 is connected by controllable silicon SCR 1 in output overcurrent signal, and the control voltage of triode output is high electricity
Flat, using the characteristic of 10 feet of 3524 integrated circuits, when controlling voltage is low level, PWM wave is open-minded；When control voltage is height
When level, PWM wave is closed.In this way, when over-current signal output, so that it may realize to the self-locking of PWM wave.
The PWM wave generative circuit 16 is the Switching Power Supply integrated manipulator being made of 3524 integrated circuits, by external
Capacitor C6-1 and slide rheostat W2, PI controller are constituted.The frequency of oscillation of circuit is true by external capacitor C6-1 and resistance W institute
Fixed, the output voltage of PI controller accesses the pin 2 of 3524 integrated circuits.When input voltage increases, 3524 IC inputs
Rectangular pulse out narrows, and is shortened by the turn-on time of the pulse controlled power supply final power switching tube, output voltage becomes smaller；
When input voltage reduces, the rectangular pulse of 3524 integrated circuits output broadens.It can be stabilized the output voltage.
The current sensor circuit 17 is made of magnetic core and Hall element.The magnetic flux that periphery electric current generates is by high-quality
Magnetic core is assembled in this road, and Hall element is fixed in a small gap, carries out linearity test, Hall element output to magnetic flux
Hall voltage after special circuit is handled, the output of secondary side with primary side waveform is consistent follows output voltage, this voltage can essence
The really variation of reflection primary current.
The controller circuitry 18 is by first voltage follower U5A, resistance R5-1, R5-2, R5-3, R5-4, R5-5, R5-
6, R5-7, R5-8, R5-9, R5-10 and ground capacity C5-1, C5-2, C5-3 amplifier, slide rheostat W1 and W2, digital-to-analogue turn
Parallel operation (D/A), second voltage follower U1A, subtracter U2A and pi regulator are constituted.And pi regulator is by amplifier U3A, electricity
Hold C5-2, resistance R5-6, R5-7 are constituted.The pin 3 of the voltage access first voltage follower U5A exported from current sensor,
It is exported through the first overvoltage follower U5A, plays impedance matching, filter high fdrequency component using a resistance and ground capacity
It is connected to an amplifier, magnification ratio is determined by the value of slide rheostat and ground resistance.By D/A converting circuit (D/
A) voltage exported first passes through resistance R5-1 and ground capacity filter C5-1 except high fdrequency component, then passes through second voltage follower
U1A obtains given voltage, and the voltage and the part voltage obtained from current sensor are accessed subtracter U2A, must be deviated
Voltage, which carries out proportional integration operation by pi regulator, and guarantees the feedback quantity and specified rate of controlled device
It is equal.
It is the LM4871 chip amplifier using 8 pin packages that the electric signal, which turns acoustical signal circuit 19, and shutdown end is drawn
Foot 1 is by selection switch ground connection, or is connected through resistance R1 with power supply VCC, and voltage reference end pin 2 is grounded by capacitor Cb,
Non-inverting input terminal pin 3 meets input audio signal (Audio Input) by capacitor Cb, resistance R2 and coupled capacitor Ci, reversely
Input terminal pin 4 is connected to volume by resistance R5 and exports one end pin 5, and power end pin 6 is powered using single supply, and in power supply
The capacitor Cb to 1 μ F external between ground is held, filters the high-frequency ac ingredient of power supply, ground terminal pin 7 is directly grounded.
It is reversed defeated when input audio signal coupled capacitor Ci and resistance R2 is added to the non-inverting input terminal pin 3 of amplifier
Enter to hold pin 4 to be connected to volume by resistance R5 and export one end pin 5, shutdown end pin 1 by selection switch ground connection or with electricity
Source and resistance R1 are connected, and voltage reference end pin 2 is by capacity earth, and to filter out high frequency ripple interference, power end pin 6 is adopted
It is powered with single supply.
After powering on, circuit is started to work, and electric current passes to power amplifier first, then arrives coil and magnet segment,
After displacement sensor and differential capacitance type displacement sensing system, current maglev position signal is recorded, after being initially powered
In one minute, vibrates main pumping and be not in suspended state.At signal reason tune circuit, analog to digital conversion circuit (A/D), digital signal
Processing of circuit is managed, treated, and current maglev position signal is compared with reference position signal, then pass through controller,
The size of current on coil is adjusted by power amplifier, to change the position of vibrating spindle, until vibrating spindle can hang
It floats successfully, and steady operation.The two sides of vibrating spindle are connected with chatter piece, and the coil current size of chatter on piece controls
Vibration frequency, chatter piece drive surrounding air vibration, cause sounding.
When no power, left support support 4 and right support support 6 support vibrating spindle 1 and chatter piece 5.When energized,
Left support support 4 and right support support 6 still support vibrating spindle 1 and chatter piece 5.After energization, magnetic circuit system is started to work,
Left support support 4 and right support support 6 can be moved down, be withdrawn.
Claims (3)
1. one kind can weaken a point electroacoustic transducer for vibration phenomenon, which is characterized in that be provided with magnetic circuit system in shell (11)
And vibrational system, it is configured to weaken and an electroacoustic transducer for vibration phenomenon is divided to make vibrational system under the magneticaction of magnetic circuit system
Vibrating spindle (1) be suspended in the air, and make vibrating spindle (1) always can be in stable equilibrium state, no mechanical friction, nothing
Contact wear can effectively avoid a point generation for vibration phenomenon；The vibrational system is by with shell (11) connecting and being arranged symmetrically
Left support support (4) and right support support (6) are respectively arranged with vibration in connection in left support support (4) and right support support (6)
It moves sound piece (5), is provided with the magnetic suspension bearing (3) connecting with shell (11), magnetic suspension bearing between Yu Suoshu chatter piece (5)
(3) vibrating spindle (1) for being connected to and being connected with chatter piece (5) is worn in, vibrating spindle (1) and chatter piece (5) are linked together structure
At the sonification system of electroacoustic transducer, and magnetic substance (9) are provided on shell corresponding with vibrating spindle (1) (11) inner wall
And constitute, the magnetic suspension circuit board (10) of arrangement magnetic suspension bearing circuit is provided on magnetic suspension bearing (3), in vibrating spindle
(1) it is provided with arrangement electric signal on turns the electric signal of acoustical signal circuit and turn acoustical signal circuit board (8)；The magnetic circuit system includes magnetic
Suspension bearing circuit and electric signal turn acoustical signal circuit, this two parts circuit is independent of one another.
2. one kind as described in claim 1 can weaken a point electroacoustic transducer for vibration phenomenon, which is characterized in that the magnetic suspension
Bearing circuit includes displacement sensor circuit (12), signal reason tune circuit (13), power circuit (14), power amplifier circuit
(15), PWM wave generative circuit (16), current sensor circuit (17), controller circuitry (18)；
Described displacement sensor circuit (12) is differential capacitor displacement sensor circuit, including conversion circuit, detection circuit, phase shift
Device circuit and low-pass filter circuit；The capacitor C1-1 and C1-2 that conversion circuit is made of three pieces of pole plates connect with transformer and
It constitutes, the transformer output voltage in power circuit (14) is determined by the transformation of the capacitor plate positional shift of conversion circuit
Transformation；Detection circuit is connected by four general-purpose diodes D1-1, D1-2, D1-3 and D1-4 and is constituted, detection circuit output electricity
Press only related with the capacitance voltage in conversion circuit, positive and negative by detection circuit output voltage judges the electricity in conversion circuit
Hold the shift transformation of pole plate；Phase shifter circuit, which is connected by advanced phase shifter circuit with lag phase shifter circuit, to be constituted, and phase shift is passed through
Device circuit can make the node voltage of the left end input signal R2-1 change phase, and the range for changing phase is -180 ° to 180 °；Low pass
Filtered electrical routing resistance R1-3, capacitor C1-3 are constituted, since the voltage of detection circuit output includes DC component and high fdrequency component,
Each harmonic component, which can be filtered out, by low-pass filter circuit obtains required DC component；
Described signal reason adjust circuit (13) by low-pass filter circuit, follower circuit, adjust slide rheostat, subtraction circuit and
Two-stage amplifier composition；The high frequency of displacement sensor circuit (12) output is filtered out by low-pass filter circuit and follower circuit
Interference signal carries out impedance transformation by follower circuit later, then is subtracted by subtraction circuit and obtained by adjusting slide rheostat
The desired voltage arrived；
Described power circuit (14) is by power transformer, and rectification circuit is connected with filter circuit and is constituted, by power transformer
Alternating current is generated, alternating current is switched to the Rectified alternating current with direct current ingredient by rectification circuit, then, through filter circuit
Alternating component in pulsating direct current is filtered out, reduction flip-flop, ingredient of increasing exchanges, to reduce the ripple of DC voltage, and
Filter out High-frequency Interference；
Described power amplifier circuit (15) by power main circuit, overcurrent protection circuit and overcurrent protection latching circuit phase
It connects and constitutes, if overcurrent occurs in circuit, fault-signal is exported by power main circuit, grid are avoided by overcurrent protection circuit
There is the phenomenon that overvoltage in pole and emitter-base bandgap grading, when over-current signal output, are realized by the latching circuit of overcurrent protection to PWM wave
The PWM wave that generative circuit (16) generates is self-locking；
Described PWM wave generative circuit (16) is the Switching Power Supply integrated manipulator being made of 3524 integrated circuits, oscillator, external
Capacitor C6-1 and resistance W, PI controller constitute, when input voltage increase when, 3524 integrated circuits output rectangular pulse become
It is narrow；When input voltage reduces, the rectangular pulse of 3524 integrated circuits output broadens, and can be stabilized the output voltage；
Described current sensor circuit (17) is made of magnetic core and Hall element, and the magnetic flux that periphery electric current generates is by the magnetic of high-quality
Core is assembled in this road, and Hall element is fixed in a small gap, carries out linearity test to magnetic flux, Hall element output
Hall voltage is after special circuit is handled, and secondary side, which exports, and primary side waveform is consistent follows output voltage, this voltage can be accurate
Reflect the variation of primary current；
Described controller circuitry (18) by first voltage follower U5A, resistance and ground capacity, amplifier, slide rheostat and
Ground resistance, digital analog converter (D/A), second voltage follower U1A, subtracter U2A and pi regulator are constituted；
The pin 3 of the voltage access first voltage follower U5A exported from current sensor (17), by first voltage follower
U5A output, plays impedance matching, after filtering high fdrequency component using resistance R5-10 and ground capacity C5-3, is put by one
Big device U4A amplification, magnification ratio are determined by the value of slide rheostat W1 and ground resistance R5-9, using digital-to-analogue conversion electricity
Road (D/A) carries out output voltage after digital-to-analogue conversion, which first passes through resistance R5-10 and ground capacity C5-3 filters out high frequency
Then component obtains given voltage by second voltage follower U1A, obtain by the given voltage and from current sensor (17)
The part voltage input subtracter U2A arrived, obtains deviation voltage, which carries out proportional integration fortune by pi regulator
It calculates, and guarantees the feedback quantity and specified rate phase of controlled device.
3. one kind as described in claim 1 can weaken a point electroacoustic transducer for vibration phenomenon, which is characterized in that the electric signal
Turning acoustical signal circuit (19) is the LM4871 chip amplifier using 8 pin packages, and shutdown end pin 1 is by selecting switch to connect
Ground, or be connected through resistance R1 with power supply VCC, voltage reference end pin 2 is grounded by capacitor Cb, and non-inverting input terminal pin 3 is logical
It crosses capacitor Cb, resistance R2 and coupled capacitor Ci and connects input audio signal, it is defeated that reverse input end pin 4 by resistance R5 is connected to volume
One end pin 5 out, power end pin 6 is powered using single supply, and filters power supply to external capacitor Cb between ground in power end
High-frequency ac ingredient, ground terminal pin 7 are directly grounded；
When input audio signal coupled capacitor Ci and resistance R2 is added to the non-inverting input terminal pin 3 of amplifier, reverse input end
Pin 4 is connected to volume by resistance R5 and exports one end pin 5, shutdown end pin 1 by selection switch ground connection or and power supply with
And resistance R1 is connected, voltage reference end pin 2 is by capacity earth, and to filter out high frequency ripple interference, power end pin 6 is using single
Power supply power supply.
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| CN109459168A (en) * | 2018-09-30 | 2019-03-12 | 江苏大学 | A kind of electromagnetic balance formula pull pressure sensor |
| CN111405449B (en) * | 2020-02-17 | 2021-08-17 | 中国兵器装备集团上海电控研究所 | Anti-squeal electroacoustic calling device |
| CN111900942A (en) * | 2020-08-03 | 2020-11-06 | 河南大学 | Audio amplifier based on optical sensing technology |
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| JP2002095079A (en) * | 2000-09-12 | 2002-03-29 | Citizen Electronics Co Ltd | Multifunctional sound system |
| JP4604415B2 (en) * | 2001-07-19 | 2011-01-05 | パナソニック株式会社 | Speaker |
| CN1516326A (en) * | 2003-01-07 | 2004-07-28 | 总格实业股份有限公司 | Electricity-saving type handset vibration device |
| JP2004266307A (en) * | 2003-01-09 | 2004-09-24 | Tdk Corp | Speaker unit and audio output device |
| FR2954574B1 (en) * | 2009-12-18 | 2014-08-08 | Hutchinson | METHOD FOR MANUFACTURING A MOLDED MAGNET |
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