CN1443020A - Signal excitation type electric microphone system - Google Patents
Signal excitation type electric microphone system Download PDFInfo
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- CN1443020A CN1443020A CN 03106570 CN03106570A CN1443020A CN 1443020 A CN1443020 A CN 1443020A CN 03106570 CN03106570 CN 03106570 CN 03106570 A CN03106570 A CN 03106570A CN 1443020 A CN1443020 A CN 1443020A
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- signal
- voice coil
- magnetic
- magnet exciting
- electrodynamic loudspeaker
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Abstract
A system of signal-excited electrodynamic loudspeaker is composed of an electrodynamic loudspeaker which consists of magnetic conductive hood, upper clampibng plate, DC excitation coil, and signal excitation coil, and a complemental circuit diagram. It can limit overheat of voice coil during large power operation through the complemental circuit diagram and can send audio current into the signal excitation coil through the signal excitation circuit to increase the magnetic induction intensity in air gap located by the voice coil for compensating the clipping distortion of the voice coil current when audio signal is too strong and input current of the voice coil is over loaded.
Description
Technical field
The present invention relates to the electroacoustic techniques field.
Background technology
Early stage electrodynamic loudspeaker adopts the DC excitation mode, a stationary magnetic field is provided for electrodynamic loudspeaker voice coil loudspeaker voice coil place air gap.Later development along with permanent-magnet steel, direct-flow magnet exciting coil is replaced by permanent-magnet steel, voice coil loudspeaker voice coil electric current in these existing electrodynamic loudspeakers increases along with the raising of loud speaker input power, bear current capacity and radiating efficiency in order to improve voice coil loudspeaker voice coil, adopt large scale voice coil loudspeaker voice coil and thicker lead, to the loudspeaker vibrating body quality is increased, cause the loud speaker electroacoustic performance to become bad.In addition, in order to prevent the sound equipment power amplifier when moment, strong signal was imported, its output voltage produces clipping distortion, and selects the audio-frequency power amplifier than the big several times of audio amplifier power for use, causes the consequence that loudspeaker voice coil is often burnt in the audio amplifier.
Summary of the invention
Technical problem to be solved by this invention is to prevent the mistake cause thermal damage of loudspeaker voice coil when high-power input.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: by the magnetic conduction core, magnetism-guiding hood, in the DC excitation formula electrodynamic loudspeaker that train wheel bridge and direct-flow magnet exciting coil are formed, increase a signal magnet exciting coil and support circuit, constitute signal electrodynamic loudspeaker system.When audio signal is strong excessively, during voice coil loudspeaker voice coil input current excess load, support circuit plays restriction voice coil loudspeaker voice coil electric current increase effect.The synchronous signal field circuit is opened, and tone currents is sent into the signal magnet exciting coil, increases the magnetic flux density in the air gap of voice coil loudspeaker voice coil place, the clipping distortion of compensation voice coil loudspeaker voice coil electric current.
Direct-flow magnet exciting coil among the present invention in the signal electrodynamic loudspeaker can be merged into same magnet exciting coil with the signal magnet exciting coil after mixing special circuit.
The signal electrodynamic loudspeaker also can be by the signal magnet exciting coil among the present invention, magnetic conductive cover, and magnetism-guiding hood, the voice coil loudspeaker voice coil independent groups becomes magnetic loop in train wheel bridge and the signal excitation air gap, produces electric power, and the signal excitation function is used in the electrodynamic loudspeaker of permanent-magnet steel.
A plurality of signal magnet exciting coils can be set in the signal electrodynamic loudspeaker among the present invention, and current input signal is developed to Digital Loudspeakers respectively.
Compared with prior art, advantage of the present invention is to make electrodynamic loudspeaker voice coil loudspeaker voice coil when high-power input can not cross cause thermal damage, and in the power bracket of design limiting, can not reduce the loud speaker output sound pressure level or produce clipping distortion.For loud speaker with ferromagnetic materials such as neodymium iron borons, behind the employing signal exciting method, improved the loud speaker input power, also can be developed into the supersound projector that sound equipment is used.The present invention also can be developed into digital loudspeaker in addition.
Description of drawings
Fig. 1 is a signal electrodynamic loudspeaker structure chart.
1-magnetic conduction core; The last caoutchouc elasticity pad of 2-; 3-signal magnet exciting coil; The 4-direct-flow magnet exciting coil; Caoutchouc elasticity pad under the 5-; The 6-magnetism-guiding hood; The 7-train wheel bridge; The 8-patch bay; 9-basin frame; 10-pad limit; The 11-vibrating diaphragm; The 12-dust cap; The 13-voice coil loudspeaker voice coil; The 14-support plate; 15-magnet exciting coil patch bay; 16-magnet exciting coil lead-in wire; 17-magnet exciting coil skeleton.
Fig. 2 is magnetic conduction core (a 1) structure chart.
Fig. 3 is laminated type train wheel bridge (a 7) structure chart.
Fig. 4 is and the supporting field circuit structure chart of signal electrodynamic loudspeaker of single magnet exciting coil.
The L-magnet exciting coil.
Fig. 5 is and the supporting circuit structure diagram of signal electrodynamic loudspeaker Fig. 1.
V
0-prime audio-frequency power amplifier output signal voltage; V
I1-voice coil loudspeaker voice coil circuit input signal voltage; V
I2-signal field circuit applied signal voltage; LY-signal electrodynamic loudspeaker; 3-signal magnet exciting coil; The 4-direct-flow magnet exciting coil; T
1-voice coil loudspeaker voice coil signal and excitation signal distribution transformer; T
2-audio frequency output transformer; The B-power transformer; VT
1-preposition amplifying triode; VT
2-power amplification triode; VD
1, VD
2, VD
3-voltage stabilizing didoe; R-resistance.
Fig. 6 is the audio voltage oscillogram.
V
0-prime audio-frequency power amplifier output voltage waveforms; The t-time.
Fig. 7 is signal electrodynamic loudspeaker (LY) voice coil loudspeaker voice coil (13) input current waveform figure.
I
0-voice coil loudspeaker voice coil (13) electric current; The t-time.
Fig. 8 is the magnetic induction waveform figure of signal electrodynamic loudspeaker (LY) voice coil loudspeaker voice coil (13) place air gap.
B-magnetic flux density; The t-time.
Fig. 9 is subjected to electric power size oscillogram for signal electrodynamic loudspeaker (LY) voice coil loudspeaker voice coil (13).
The F-electric power; The t-time.
Figure 10 uses structure chart for the signal excitation in the permanent-magnet steel electrodynamic loudspeaker.
The 18-carriage; Voice coil loudspeaker voice coil in the 19-signal excitation air gap; The 20-magnetic conductive cover; The 21-magnetic conduction sheet; The 22-permanent-magnet steel.2,3,6,7,9,11,12,13,14,16,17 same Fig. 1 wherein.
Embodiment
Below in conjunction with accompanying drawing embodiment invention is described in further detail.
Embodiment one:
Press Fig. 1, Fig. 2, Fig. 5 form signal electrodynamic loudspeaker system.As shown in Figure 1, by magnetic conduction core (1), magnetism-guiding hood (6).Train wheel bridge (7), and direct-flow magnet exciting coil (4) signal magnet exciting coil (3) composition signal electrodynamic loudspeaker are mixed corresponding circuit diagram 5 simultaneously.Wherein power transformer (B) provides voice coil loudspeaker voice coil signal amplification circuit and DC excitation energy.Prime audio-frequency power amplifier output signal voltage (V
0) through voice coil loudspeaker voice coil signal and excitation signal distribution transformer (T
1) be divided into two-way.One road voice coil loudspeaker voice coil circuit input signal voltage (V wherein
I1) through preposition amplifying triode (VT
1) and power amplification triode (VT
2) amplifying circuit formed, again through audio frequency output transformer (T
2) voice coil loudspeaker voice coil (13) electric current of signal electrodynamic loudspeaker (LY) is provided; Another road signal field circuit applied signal voltage (V
I2) signal magnet exciting coil (3) electric current of signal electrodynamic loudspeaker (LY) is provided behind the signal field circuit.
As prime audio-frequency power amplifier output signal voltage (V
0) size is in frequent scope, i.e. power amplification triode (VT
2) during unsaturation, signal field circuit applied signal voltage (V
I2) also less, voltage stabilizing didoe (VD
1), (VD
2) close, then no current passes through in the signal magnet exciting coil (3), and whole signal electrodynamic loudspeaker system is in traditional electrodynamic loudspeaker operating state.
As prime audio-frequency power amplifier output signal voltage (V
0) when enough big, power amplification triode (VT
2) saturated, the voltage of exporting to signal electrodynamic loudspeaker (LY) voice coil loudspeaker voice coil (13) no longer increases, at this moment, and signal field circuit applied signal voltage (V
I2) higher, voltage-stabiliser tube (VD
1), (VD
2) change with the audio voltage positive-negative polarity, replace a reverse breakdown, the another forward conduction.Signal field circuit applied signal voltage (V
I2) deduct voltage-stabiliser tube (VD
1) or (VD
2) the voltage of difference of puncture voltage through behind bridge rectifier and the resistance (R), electric current flows into signal magnet exciting coil (3), the polarity of the magnetic field of its generation is identical with the stationary magnetic field polarity that direct-flow magnet exciting coil (4) produces.It is constant to produce magnetic flux density polarity behind the two magnetic field superpositions in the air gap of voice coil loudspeaker voice coil (13) place of signal electrodynamic loudspeaker (LY), and size is with prime audio-frequency power amplifier output signal voltage (V
0) amplitude size and the magnetic field that changes makes voice coil loudspeaker voice coil (13) forced vibration in this magnetic field by the slicing electric current, voice coil loudspeaker voice coil (13) is subjected to electric power waveform and prime audio-frequency power amplifier output signal voltage (V
0) waveform is identical.From prime audio-frequency power amplifier output signal voltage (V
0) waveform to the stressed sounding waveform of vibrating diaphragm (11) sees Fig. 6, Fig. 7, Fig. 8, Fig. 9 respectively.Therefrom as seen, the clipping distortion of the strong signal of audio frequency is compensated from the signal excitation, makes signal electrodynamic loudspeaker (LY) playback, can not produce clipping distortion when strong signal.The electric current that while voice coil loudspeaker voice coil (13) passes through is less.
Above-mentioned operating state requires voltage-stabiliser tube (VD
1), (VD
2) reverse breakdown voltage and voice coil loudspeaker voice coil circuit input signal voltage (V
I1) make power amplification triode (VT
2) signal field circuit applied signal voltage (V when saturated
I2) equate.The cooperation of above-mentioned two voltages can be by selecting voice coil loudspeaker voice coil signal and excitation signal distribution transformer (T
1) turn ratio, the voltage stabilizing didoe (VD of different puncture voltages
1), (VD
2) reach.
In addition as prime audio-frequency power amplifier output signal voltage (V
0) saturated for the magnetic loop of anti-stop signal electrodynamic loudspeaker (LY) when strong especially, as shown in Figure 5, with voltage stabilizing didoe (VD
3) and resistance (R) to signal exciting voltage amplitude limit, stop special large-signal exciting current entering signal magnet exciting coil (3), signal electrodynamic loudspeaker this moment (LY) output acoustic pressure produces clipping distortion.
The magnetic loop of present embodiment obtains the magnetic permeability of frequency characteristic flat in order to overcome eddy current, magnetic conduction core (1), and train wheel bridge (7) adopts magnetic permeability height, the metal dust magnetizing mediums that resistivity is also high.And magnetism-guiding hood (6) is bigger because of its magnetic conduction sectional area, for reducing cost, adopts high frequency characteristics good, but the lower manganese-zinc ferrite soft magnetism of magnetic permeability.The wherein favourable voice coil loudspeaker voice coil of magnetic conduction core (1) mesopore (13) heat radiation, the eddy current loss that wide about 0.2mm groove can reduce magnetic conduction core (1) is opened in the side.
Embodiment two:
On the basis of embodiment one,, shown in Figure 4 as Fig. 3.For reducing cost, train wheel bridge (7) adopts bonding the coinciding of silicon steel sheet to form.Be to improve magnet exciting coil efficient, the direct-flow magnet exciting coil among Fig. 5 (4) and signal magnet exciting coil (3) are merged into a magnet exciting coil (L) among Fig. 4, and mix Fig. 4 field circuit, the same Fig. 5 of the other parts of support circuit.Present embodiment requires power amplification triode (VT
2) begin when saturated signal field circuit applied signal voltage (V
I2) through bridge rectifier, resistance (R) back arrives magnet exciting coil (L) both end voltage and is slightly larger than DC excitation voltage, the circuit matching design is relatively complicated.This form is after the signal exciting voltage surpasses DC excitation voltage in addition, and dc excitation power is not exported exciting power, requires the signal field power supply that the power bigger than embodiment one is provided, and has increased prime audio-frequency power amplifier burden.
Embodiment three:
As shown in figure 10, be a kind of mode that the signal excitation is used in the permanent-magnet steel electrodynamic loudspeaker, remove the DC excitation partial circuit among this form signal electrodynamic loudspeaker adapted Fig. 5.Its operation principle and embodiment one are similar.Its difference is the stationary magnetic field of voice coil loudspeaker voice coil among the embodiment one (13) place air gap, is provided by permanent-magnet steel (22) here.And the signal excitation mode is by signal magnet exciting coil (3), and magnetic conductive cover (20), magnetism-guiding hood (6), train wheel bridge (7) are formed a magnetic loop separately, and voice coil loudspeaker voice coil (19) compensates the suffered electrodynamic clipping distortion of voice coil loudspeaker voice coil (13) in the signal excitation air gap that promotes to set up separately.Wherein permanent-magnet steel (22) adopts neodymium iron side ferromagnetic material.Magnetic conductive cover (20) is except that the magnetic loop of forming permanent-magnet steel (22) composition, make simultaneously the magnetic conduction core of energized circuit again, play effect, use the compacting of the good metal dust magnetizing mediums of high frequency magnetic property and form so magnetic conductive cover (20) is the same with train wheel bridge (7) as magnetic conduction core (1) among Fig. 1.Magnetism-guiding hood (6) is still made of manganese-zinc ferrite.The magnetic direction that produces in the air gap of voice coil loudspeaker voice coil (13) place of permanent-magnet steel (22) should be consistent with the magnetic direction that signal magnet exciting coil (3) produces in the air gap of voice coil loudspeaker voice coil (19) place in signal excitation air gap in addition.As in the magnetic loop of forming by permanent-magnet steel (22), the polarity of magnetic conduction sheet (21) is the N utmost point, and then in the magnetic loop of signal excitation, the polarity of magnetic conductive cover (20) also should be the N utmost point, the total magnetic flux of such two magnetic fields after magnetic conductive cover (20) is gone up superposition is less, and magnetic conductive cover (20) is difficult for magnetic saturation.In addition, voice coil loudspeaker voice coil (19) is in parallel in voice coil loudspeaker voice coil (13) and the signal excitation air gap uses, and both polarity also should be consistent, so that the suffered electric power direction unanimity of two voice coil loudspeaker voice coils.
Claims (4)
1. by the magnetic conduction core, magnetism-guiding hood, train wheel bridge is formed the signal electrodynamic loudspeaker system of magnetic loop, it is characterized in that using simultaneously direct-flow magnet exciting coil and signal magnet exciting coil, and mixes corresponding circuit.
2. signal electrodynamic loudspeaker according to claim 1 system is characterized in that signal magnet exciting coil and direct-flow magnet exciting coil unite two into one, and mixes corresponding circuit.
3. by permanent-magnet steel, magnetic conduction sheet, magnetic conductive cover is formed the signal electrodynamic loudspeaker system of magnetic loop, it is characterized in that increasing voice coil loudspeaker voice coil in the signal excitation air gap, magnetism-guiding hood, train wheel bridge, form the signal energized circuit together separately with magnetic conductive cover, produce electric power, and mix related circuit.
4. signal electrodynamic loudspeaker according to claim 1 system is characterized in that being provided with many signal magnet exciting coils in the signal electrodynamic loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031065708A CN1190995C (en) | 2003-03-03 | 2003-03-03 | Signal excitation type electric microphone system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031065708A CN1190995C (en) | 2003-03-03 | 2003-03-03 | Signal excitation type electric microphone system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1443020A true CN1443020A (en) | 2003-09-17 |
| CN1190995C CN1190995C (en) | 2005-02-23 |
Family
ID=27796644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031065708A Expired - Fee Related CN1190995C (en) | 2003-03-03 | 2003-03-03 | Signal excitation type electric microphone system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1190995C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101855915A (en) * | 2007-09-14 | 2010-10-06 | Hpv技术公司 | Full range planar magnetic microphone and arrays thereof |
| CN105554656A (en) * | 2016-02-29 | 2016-05-04 | 歌尔声学股份有限公司 | Moving-coil loudspeaker structure and audio playing device |
| CN105723742A (en) * | 2013-11-06 | 2016-06-29 | 丹麦技术大学 | Loudspeaker assembly with suppression of magnetic flux modulation distortion |
| CN106792400A (en) * | 2017-03-16 | 2017-05-31 | 深圳精拓创新科技有限公司 | Loudspeaker and the method for reducing loudspeaker total harmonic distortion |
| CN108900934A (en) * | 2018-07-03 | 2018-11-27 | 彭从文 | Spraying speaker |
| CN109495824A (en) * | 2018-12-28 | 2019-03-19 | 广州市合和音响实业有限公司 | Magnetic circuit of loudspeaker and digital speaker |
-
2003
- 2003-03-03 CN CNB031065708A patent/CN1190995C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101855915A (en) * | 2007-09-14 | 2010-10-06 | Hpv技术公司 | Full range planar magnetic microphone and arrays thereof |
| CN105723742A (en) * | 2013-11-06 | 2016-06-29 | 丹麦技术大学 | Loudspeaker assembly with suppression of magnetic flux modulation distortion |
| CN105554656A (en) * | 2016-02-29 | 2016-05-04 | 歌尔声学股份有限公司 | Moving-coil loudspeaker structure and audio playing device |
| CN105554656B (en) * | 2016-02-29 | 2019-05-07 | 歌尔股份有限公司 | Coil-moving speaker structure and audio playing apparatus |
| CN106792400A (en) * | 2017-03-16 | 2017-05-31 | 深圳精拓创新科技有限公司 | Loudspeaker and the method for reducing loudspeaker total harmonic distortion |
| CN108900934A (en) * | 2018-07-03 | 2018-11-27 | 彭从文 | Spraying speaker |
| CN109495824A (en) * | 2018-12-28 | 2019-03-19 | 广州市合和音响实业有限公司 | Magnetic circuit of loudspeaker and digital speaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1190995C (en) | 2005-02-23 |
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