CN102651836A - Audio signal driver for flat-plate electroacoustic actuator - Google Patents

Abstract

The invention discloses an audio signal driver for a flat-plate electroacoustic actuator. The audio signal driver is coupled with a capacitor-type flat-plate electroacoustic actuating device, and the flat-plate electroacoustic actuating device comprises a perforated electrode plate and an electriferous diaphragm plate. The audio signal driver comprises a power signal amplifier and an audio signal amplifying transformer which is used for receiving an input audio signal and converting the input audio signal into two high-voltage output audio signals. The two high-voltage output audio signals are respectively coupled with the perforated electrode plate and the electriferous diaphragm plate, wherein the audio signal amplifying transformer and the flat-plate electroacoustic actuating device form a low-pass filter effectively. Besides effective reduction in the volume and weight of an electroacoustic actuator system, the audio signal driver reduces the power consumption of the electroacoustic actuator so as to prolong the service time of a portable electronic product.

Description

The message driver that is used for plate electro-acoustic actuator

Technical field

The invention relates to a kind of message driver, especially in regard to a kind of message driver that is used for plate electro-acoustic actuator.

Background technology

Along with development of technology, portable electronic product is more and more frivolous, and the requirement of first barytron product power consumption.The portable electronic product of tradition in-built electrical acoustic actuators; The volume of its plate electro-acoustic actuator system and weight greatly outside; The power consumption of required drive unit is about 1.5-2W, has accounted for the 20%-70% of the overall power of portable electronic product, and is so high as far as portable electronic product.Therefore, plate electro-acoustic actuator system also comes into one's own gradually.

Shown in Figure 1 is the existing electrical block diagram that is used for the message driver 102 of plate electro-acoustic actuator 101.Message driver 102 is to be coupled to the plate electro-acoustic actuator 101 of condenser type.Message driver 102 includes audio amplifier 108 and low frequency range-high power transformer 109, imports audible signals Sin in order to receive, and converts thereof into positive or negative high voltage output audible signals So1 and So2 that two intensity equate.Plate electro-acoustic actuator 101 comprises two electrodes 106 and 104 and at the very flat thin film belt body 105 of one of electrode 106 and 104, and electrode 106 and 104 can be grid (grid) or stator (stator).Very flat thin film belt body 105 is accepted HVDC 107.The positive or negative high voltage output audible signals So1 that equates when two intensity divides with So2 and is added to electrode 106 and 104 last times, and very flat thin film belt body 105 will be attracted or repels by electrode 106 and 104, thereby produces and vibrate and sound.

Because known plate electro-acoustic actuator system uses the high pressure signal to produce sound; Therefore in message driver 102, must use low frequency range-high power transformer 109, could the signal that audio amplifier 108 is produced be converted to positive or negative high voltage output audible signals So1 and So2 that plate electro-acoustic actuator 101 two required intensity equate.Yet, low frequency range-high power transformer 109, in order to avoid distortion in whole audiorange, it needs big inductance coil (coil inductor), large scale is unshakable in one's determination and will take bigger space, also is a kind of element of costliness.In other words, it will cause the volume of plate electro-acoustic actuator 101 and weight effectively to reduce.

Therefore, how effectively reducing the volume and the weight of electro-acoustic actuator system, and save the electro-acoustic actuator power consumption to promote the service time of portable electronic product, is one of the important topic in the design field.

Summary of the invention

Because the message Drive technology weak point of above-mentioned plate electro-acoustic actuator system; The present invention provides a kind of message driver; Outside the volume and weight with effective reduction electro-acoustic actuator system, and save the electro-acoustic actuator power consumption to promote the service time of portable electronic product.

The present invention provides a kind of message driver that is used for plate electro-acoustic actuator; This plate electro-acoustic actuator comprises perforated electrodes plate and charged vibrating diaphragm plate; This message driver is coupled to this plate electro-acoustic actuator; Wherein, said message driver comprises: the power signal amplifier, in order to accept the input audible signals and to convert input message power amplification signal to; And message amplifying transformer; Also will import the output audible signals that message power amplification signal converts two high pressure in order to accept this input message power amplification signal, the output audible signals of these two high pressure couples this perforated electrodes plate and this charged vibrating diaphragm plate respectively; Wherein, this message amplifying transformer forms low pass filter effectively with this plate electroacoustic actuating device.

The present invention also provides a kind of message driver that is used for plate electro-acoustic actuator; This plate electro-acoustic actuator comprises perforated electrodes plate and charged vibrating diaphragm plate; This message driver is coupled to this plate electro-acoustic actuator, and wherein, said message driver comprises: the power signal amplifier; In order to accept the input audible signals and to convert input message power amplification signal to; And message amplifying transformer; In order to accept this input message power amplification signal and will import the output audible signals that message power amplification signal converts a high pressure to; The output audible signals of this high pressure couples this perforated electrodes plate, this charged vibrating diaphragm plate coupling earth terminal; Wherein, this message amplifying transformer forms low pass filter effectively with this plate electroacoustic actuating device.

Preferably, said message driver further comprises: AC-DC power supply transducer or DC-DC power transducer, and in order to provide HVDC to this power signal amplifier.

Preferably, this power signal amplifier is class ab ammplifier or D class A amplifier A.

Preferably, this input audible signals is provided by MP3 player, CD Player or Smartphone.

Preferably, this charged vibrating diaphragm plate electrode layer of including the film body layer and having electric charge.

Compared with prior art, the message driver that is used for plate electro-acoustic actuator provided by the invention is except that can also forming a low pass filter effectively with the capacitance type electroacoustic actuator in order to receive the input audible signals and to convert thereof into the high pressure output audible signals.Therefore, the present invention both can effectively reduce the volume and the weight of electro-acoustic actuator system, and the power consumption of also further saving electro-acoustic actuator is to promote the service time of portable electronic product.

Below in conjunction with accompanying drawing and specific embodiment technical scheme of the present invention is carried out detailed explanation, so that characteristic of the present invention and advantage are more obvious.

Description of drawings

Shown in Figure 1 for having the electrical block diagram of the message driver that is used for plate electro-acoustic actuator now;

Shown in Figure 2 is the electrical block diagram of the message driver that is used for plate electro-acoustic actuator of one embodiment of the invention;

Shown in Figure 3 is the electrical block diagram of the message driver that is used for plate electro-acoustic actuator of another embodiment of the present invention.

Embodiment

Below will provide detailed explanation to embodiments of the invention.Though the present invention will combine embodiment to set forth, should understand this is not to mean the present invention is defined in these embodiment.On the contrary, the invention is intended to contain defined various variations, modification and equipollent in the spirit and scope of the invention that defines by accompanying claims.

Shown in Figure 2 for being used for the electrical block diagram of the message driver 202 of plate electro-acoustic actuator 201 according to an embodiment of the invention.Message driver 202 is to be coupled to the plate electro-acoustic actuator 201 of condenser type.Message driver 202 includes power signal amplifier 204 and message amplifying transformer 203, imports audible signals Sin in order to receive, and converts thereof into positive or negative high voltage output audible signals So1 and So2 that two intensity equate.In one embodiment, input audible signals Sin is the audible signals that is provided by for example portable multimedia devices such as MP3 player, CD Player or Smartphone.Power signal amplifier 204 is accepted the HVDC VDCH that HVDC source 209 provides, and will import audible signals Sin and be enlarged into input message power amplification signal Sin '.In one embodiment, HVDC source 209 is provided by AC-DC power supply transducer (not shown) or DC-DC power transducer (not shown).Power signal amplifier 204 is to be class ab ammplifier or D class A amplifier A, but is not limited to this.

The plate electro-acoustic actuator 201 of condenser type includes perforated electrodes plate (perforatedelectrode plate) 205 and charged vibrating diaphragm plate (diaphragm) 210, and wherein perforated electrodes plate 205 has plurality of openings 207.The electrode layer 206 that charged vibrating diaphragm plate 210 includes film body layer 208 and has electric charge.In one embodiment, main film body layer 208 is to be made up of polytetrafluoroethylene (PTFE) or fluorinated ethylene propylene (FEP) (FEP), but is not limited to this.In one embodiment, electrode layer 206 is made up of aluminium, chromium or other electric conducting materials, but is not limited to this.Perforated electrodes plate 205 is accepted high pressure output audible signals So1 and So2 respectively with charged vibrating diaphragm plate 210.

The plate electro-acoustic actuator 201 of condenser type can be considered an electric capacity, and its capacitance C can represent according to following formula:

$C={\mathrm{\ϵ}}_o{\mathrm{\ϵ}}_r\frac{A}{d}---\left(1\right)$

Wherein, ε _oBe the dielectric coefficient of vacuum, and ε _rBe relative dielectric coefficient, A represents the area of charged vibrating diaphragm plate 210 and perforated electrodes plate 205, and d represents the distance of charged vibrating diaphragm plate 210 and perforated electrodes plate 205.

Input message power amplification signal Sin ' amplifies N through message amplifying transformer 203 ₂/ N ₁Doubly, convert output audible signals So1 and So2 to the plate electro-acoustic actuator 201 of drive capacitor formula.Wherein

$S_{O1}={S_{\mathrm{in}}}^{\′}\frac{N_2}{N_1}+V_{\mathrm{DCH}},$ $S_{O2}={S_{\mathrm{in}}}^{\′}\frac{N_2}{N_1}-V_{\mathrm{DCH}}---\left(2\right)$

Or

$S_{O1}={S_{\mathrm{in}}}^{\′}\frac{N_2}{N_1}-V_{\mathrm{DCH}},$ $S_{O2}={S_{\mathrm{in}}}^{\′}\frac{N_2}{N_1}+V_{\mathrm{DCH}}---\left(3\right)$

In one embodiment, the secondary side of message amplifying transformer 203 compares N with the coil number of primary side ₂/ N ₁Be 50-120.In another embodiment, the coil of secondary side or primary side is the enamelled wire of 0.12 φ-0.02 φ.

The consumed power W of the plate electro-acoustic actuator 201 of condenser type _CCan represent according to following formula:

$W_C=\frac{1}{2}C{(S_{o1}-S_{o2})}^2---\left(4\right)$

Though potential difference (S _O1-S _O2) ²Very big, but the capacitance C of the plate electro-acoustic actuator 201 of condenser type minimum (usually between 20pF-20nF).Therefore with the consumed power W of the plate electro-acoustic actuator 201 of condenser type _CThe wasted work rate be μ W grade.

Advantageously, message amplifying transformer 203 removes and will import message power amplification signal Sin ' amplification N ₂/ N ₁Doubly, also form a low pass filter effectively, be used for filtering to export the high-frequency signals composition of output audible signals So1 and So2 to the capacitance type electroacoustic actuator.In addition; Message amplifying transformer 203 modulations are within the broadband of the input audible signals Sin of a higher-frequency; Therefore can not need use the high-power transformer of broad band low frequency; And only need use higher, the lower-cost transformer of centre frequency, and further reducing the volume and the weight of electro-acoustic actuator system effectively, the power consumption of also saving electro-acoustic actuator is to promote the service time of portable electronic product.In one embodiment, silicon steel sheet tool low frequency, directivity and the height of message amplifying transformer 203 are led kind magnetic coefficient.In another embodiment, the bobbin of message amplifying transformer 203 (Bobbin) is for LCP material and pin (Pin) are the C type, and is meticulous and cause broken string with the winding wire footpath of avoiding secondary side or primary side.

Shown in Figure 3 for being used for the electrical block diagram of the message driver of plate electro-acoustic actuator according to another embodiment of the present invention.Message driver 202 is to be coupled to the plate electro-acoustic actuator 201 of condenser type.Message driver 202 includes power signal amplifier 204 and message amplifying transformer 203, imports audible signals Sin in order to receive, and converts thereof into positive or negative high voltage output audible signals So1 and So2 that two intensity equate.In one embodiment, input audible signals Sin is the audible signals that is provided by for example portable multimedia devices such as MP3 player, CD Player or Smartphone.Power signal amplifier 204 is accepted the HVDC VDCH that HVDC source 209 provides, and will import audible signals Sin and be enlarged into input message power amplification signal Sin '.In one embodiment, HVDC source 209 is provided by AC-DC power supply transducer (not shown) or DC-DC power transducer (not shown).Power signal amplifier 204 is to be class ab ammplifier or D class A amplifier A, but is not limited to this.

The plate electro-acoustic actuator 201 of condenser type includes perforated electrodes plate (perforatedelectrode plate) 205 and charged vibrating diaphragm plate (diaphragm) 210, and wherein perforated electrodes plate 205 has plurality of openings 207.The electrode layer 206 that charged vibrating diaphragm plate 210 includes film body layer 208 and has electric charge.In one embodiment, main film body layer 208 is to be made up of polytetrafluoroethylene (PTFE) or fluorinated ethylene propylene (FEP) (FEP), but is not limited to this.In one embodiment, electrode layer 206 is made up of aluminium, chromium or other electric conducting materials, but is not limited to this.Perforated electrodes plate 205 is accepted high pressure output audible signals So1.One end of charged vibrating diaphragm plate 210 is ground connection then.

Input message power amplification signal Sin ' amplifies N through message amplifying transformer 203 ₂/ N ₁Doubly, convert output audible signals So1 and So2 to the plate electro-acoustic actuator 201 of drive capacitor formula.Wherein,

$S_{O1}={S_{\mathrm{in}}}^{\′}\frac{N_2}{N_1}+V_{\mathrm{DCH}}---\left(5\right)$

Or

$S_{O1}={S_{\mathrm{in}}}^{\′}\frac{N_2}{N_1}-V_{\mathrm{DCH}}---\left(6\right)$

The consumed power W of the plate electro-acoustic actuator 201 of condenser type _CCan represent according to following formula:

$W_C=\frac{1}{2}{{\mathrm{CS}}_{o1}}^2---\left(7\right)$

In one embodiment, the secondary side of message amplifying transformer 203 compares N with the coil number of primary side ₂/ N ₁Be 50-120.In another embodiment, the coil of secondary side or primary side is the enamelled wire of 0.12 φ-0.02 φ.

Though S _O1 ²Very big, but the capacitance C of the plate electro-acoustic actuator 201 of condenser type minimum (usually between 20pF-20nF).Therefore with the consumed power W of the plate electro-acoustic actuator 201 of condenser type _CThe wasted work rate be μ W grade.

Advantageously, message amplifying transformer 203 removes and will import message power amplification signal Sin ' amplification N ₂/ N ₁Doubly, also form a low pass filter effectively, be used for filtering to export the high-frequency signals composition of output audible signals So1 to the capacitance type electroacoustic actuator.In addition; Message amplifying transformer 203 modulations are within the broadband of the input audible signals Sin of a higher-frequency; Therefore can not need use the high-power transformer of broad band low frequency; And only need use higher, the lower-cost transformer of centre frequency, and further reducing the volume and the weight of electro-acoustic actuator system effectively, the power consumption of also saving electro-acoustic actuator is to promote the service time of portable electronic product.In one embodiment, silicon steel sheet tool low frequency, directivity and the height of message amplifying transformer 203 are led kind magnetic coefficient.In another embodiment, the bobbin of message amplifying transformer 203 (Bobbin) is for LCP material and pin (Pin) are the C type, and is meticulous and cause broken string with the winding wire footpath of avoiding secondary side or primary side.

Preceding text embodiment and accompanying drawing are merely embodiment commonly used of the present invention.Obviously, under the prerequisite of the present invention's spirit that does not break away from accompanying claims and defined and protection range, can have and variously augment, revise and replace.It should be appreciated by those skilled in the art that the present invention can change not deviating under the prerequisite of inventing criterion aspect form, structure, layout, ratio, material, element, element and other according to concrete environment and job requirement to some extent in practical application.Therefore, embodiment disclosed here only is illustrative rather than definitive thereof, and scope of the present invention is defined by accompanying claims scope and legal equivalents thereof, and the description before being not limited thereto.

Term and wording that this paper uses are descriptive but not circumscribed terms; When using these terms and wording; Be not intended to get rid of other and the similar equivalent of the characteristic that discloses and describe (or part of characteristic) here; And be appreciated that in accompanying claims the present invention has multiple modification.The present invention also possibly exist some other modification, change and replacement.Claim should contain all these equivalents.

Claims (10)

1. a message driver that is used for plate electro-acoustic actuator is characterized in that, this plate electro-acoustic actuator comprises perforated electrodes plate and charged vibrating diaphragm plate, and this message driver is coupled to this plate electro-acoustic actuator, and wherein, said message driver comprises:

The power signal amplifier is in order to accept the input audible signals and to convert input message power amplification signal to; And

The message amplifying transformer; Also will import the output audible signals that message power amplification signal converts two high pressure in order to accept this input message power amplification signal, the output audible signals of these two high pressure couples this perforated electrodes plate and this charged vibrating diaphragm plate respectively;

Wherein, this message amplifying transformer forms low pass filter effectively with this plate electroacoustic actuating device.

2. the message driver that is used for plate electro-acoustic actuator according to claim 1; It is characterized in that; Said message driver further comprises: AC-DC power supply transducer or DC-DC power transducer, and in order to provide HVDC to this power signal amplifier.

3. the message driver that is used for plate electro-acoustic actuator according to claim 1 is characterized in that, this power signal amplifier is class ab ammplifier or D class A amplifier A.

4. the message driver that is used for plate electro-acoustic actuator according to claim 1 is characterized in that this input audible signals is provided by MP3 player, CD Player or Smartphone.

5. the message driver that is used for plate electro-acoustic actuator according to claim 1 is characterized in that, the electrode layer that this charged vibrating diaphragm plate includes the film body layer and has electric charge.

6. a message driver that is used for plate electro-acoustic actuator is characterized in that, this plate electro-acoustic actuator comprises perforated electrodes plate and charged vibrating diaphragm plate, and this message driver is coupled to this plate electro-acoustic actuator, and wherein, said message driver comprises:

The power signal amplifier; In order to accept the input audible signals and to convert input message power amplification signal to; And

The message amplifying transformer also will be imported the output audible signals that message power amplification signal converts a high pressure in order to accept this input message power amplification signal, and the output audible signals of this high pressure couples this perforated electrodes plate, this charged vibrating diaphragm plate coupling earth terminal;

Wherein, this message amplifying transformer forms low pass filter effectively with this plate electroacoustic actuating device.

7. the message driver that is used for plate electro-acoustic actuator according to claim 6; It is characterized in that; Said message driver further comprises: AC-DC power supply transducer or DC-DC power transducer, and in order to provide HVDC to this this power signal amplifier.

8. the message driver that is used for plate electro-acoustic actuator according to claim 6 is characterized in that, this power signal amplifier is class ab ammplifier or D class A amplifier A.

9. the message driver that is used for plate electro-acoustic actuator according to claim 6 is characterized in that this input audible signals is provided by MP3 player, CD Player or Smartphone.

10. the message driver that is used for plate electro-acoustic actuator according to claim 6 is characterized in that, the electrode layer that this charged vibrating diaphragm plate includes the film body layer and has electric charge.

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