CN201957231U - Audio signal driver for flat-plate electroacoustic actuator - Google Patents
Audio signal driver for flat-plate electroacoustic actuator Download PDFInfo
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- CN201957231U CN201957231U CN201120049038XU CN201120049038U CN201957231U CN 201957231 U CN201957231 U CN 201957231U CN 201120049038X U CN201120049038X U CN 201120049038XU CN 201120049038 U CN201120049038 U CN 201120049038U CN 201957231 U CN201957231 U CN 201957231U
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Abstract
The utility model 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 a using time of a portable electronic product.
Description
Technical Field
The present invention relates to an audio driver, and more particularly to an audio driver for a flat-plate type electro-acoustic actuator.
Background
With the progress of technology, portable electronic products are increasingly thinner and lighter, and the first requirement of power consumption of electronic products is heavy. In a conventional portable electronic product with a built-in electroacoustic actuator, besides the large volume and weight of a flat electroacoustic actuator system, the power consumption of a required driving device is about 1.5-2W, which accounts for 20% -70% of the total power consumption of the portable electronic product, and is too high for the portable electronic product. Accordingly, a plate-type electro-acoustic actuator system is also gaining attention.
Fig. 1 is a schematic circuit diagram of an audio driver 102 for a flat-plate type electro-acoustic actuator 101 in the prior art. The audio driver 102 is coupled to the capacitive plate-type electro-acoustic actuator 101. The audio driver 102 includes an audio amplifier 108 and a low-frequency wide-high power transformer 109 for receiving the input audio signal Sin and converting it into two positive and negative high-voltage output audio signals So1 and So2 with equal strength. The plate-type electroacoustic actuator 101 comprises two electrodes 106 and 104 and a very flat thin film strip 105 between the electrodes 106 and 104, wherein the electrodes 106 and 104 may be grid or stator (stator). The very flat thin film tape body 105 receives a high voltage dc 107. When two positive and negative high voltage output audio signals So1 and So2 with equal strength are applied to the electrodes 106 and 104, the very flat thin film strip 105 will be attracted or repelled by the electrodes 106 and 104, thereby generating vibration and generating sound.
Since the conventional flat panel type electro-acoustic actuator system uses high voltage signals to generate sound, a low bandwidth-high power transformer 109 must be used in the audio driver 102 to convert the signals generated by the audio amplifier 108 into two positive and negative high voltage output audio signals So1 and So2 with equal strength required by the flat panel type electro-acoustic actuator 101. However, the low bandwidth-high power transformer 109 requires a large inductance (coil inductor), a large core size and a large space for avoiding distortion in the entire audio frequency range, and is an expensive component. In other words, the volume and weight of the flat-plate type electro-acoustic actuator 101 cannot be effectively reduced.
Therefore, how to effectively reduce the volume and weight of the electroacoustic actuator system and save the power consumption of the electroacoustic actuator to improve the service life of the portable electronic product is one of the important issues in the design field.
SUMMERY OF THE UTILITY MODEL
In view of the technical deficiencies of the audio driver of the flat-plate type electro-acoustic actuator system, the present invention provides an audio driver to effectively reduce the volume and weight of the electro-acoustic actuator system, and to save the power consumption of the electro-acoustic actuator to prolong the service time of the portable electronic product.
The utility model provides an audio signal driver for flat electro-acoustic actuator, this flat electro-acoustic actuator include perforated electrode board and electrified diaphragm plate, and this audio signal driver is coupled in this flat electro-acoustic actuator, wherein, the audio signal driver includes: a power signal amplifier for receiving an input audio signal and converting the input audio signal into an input audio power amplified signal; and an audio amplifying transformer for receiving the input audio power amplifying signal and converting the input audio power amplifying signal into two high-voltage output audio signals, wherein the two high-voltage output audio signals are respectively coupled to the perforated electrode plate and the charged vibrating diaphragm plate; wherein, the audio amplifying transformer and the flat-plate type electro-acoustic actuating device effectively form a low-pass filter.
The utility model discloses still provide an audio signal driver for flat electroacoustic actuator, this flat electroacoustic actuator include perforated electrode board and electrified diaphragm plate, and this audio signal driver is coupled in this flat electroacoustic actuator, wherein, the audio signal driver includes: a power signal amplifier; for receiving an input audio signal and converting the input audio signal into an input audio power amplifying signal; and an audio amplifier transformer for receiving the input audio power amplified signal and converting the input audio power amplified signal into a high-voltage output audio signal, wherein the high-voltage output audio signal is coupled to the perforated electrode plate, and the charged diaphragm plate is coupled to the ground terminal; wherein, the audio amplifying transformer and the flat-plate type electro-acoustic actuating device effectively form a low-pass filter.
Preferably, the audio driver further comprises: an AC-DC power converter or a DC-DC power converter for providing high voltage DC to the power amplifier.
Preferably, the power amplifier is a class AB amplifier or a class D amplifier.
Preferably, the input audio signal is provided by an MP3 player, a CD player, or a smart phone.
Preferably, the charged diaphragm plate comprises a film main body layer and an electrode layer with charges.
Compared with the prior art, the audio driver for the flat-plate type electro-acoustic actuator provided by the utility model can receive the input audio signal and convert the input audio signal into the high-voltage output audio signal, and can effectively form a low-pass filter with the capacitive type electro-acoustic actuator. Therefore, the utility model discloses both can effectively reduce the volume and the weight of electroacoustic actuator system, still further save the consumption of electroacoustic actuator in order to promote the live time of portable electronic product.
The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments so that the features and advantages of the present invention will be more apparent.
Drawings
Fig. 1 is a schematic circuit diagram of an audio driver for a flat-panel type electro-acoustic actuator in the prior art;
fig. 2 is a schematic circuit diagram of an audio driver for a flat-plate type electro-acoustic actuator according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an audio driver for a flat-plate type electro-acoustic actuator according to another embodiment of the present invention.
Detailed Description
Detailed descriptions will be given below of embodiments of the present invention. While the invention will be described in conjunction with the embodiments, it will be understood that they are not intended to limit the invention to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims.
Fig. 2 is a schematic circuit diagram of an audio driver 202 for a flat-plate type electro-acoustic actuator 201 according to an embodiment of the present invention. The audio driver 202 is coupled to the capacitive plate type electro-acoustic actuator 201. The audio driver 202 includes a power amplifier 204 and an audio amplifier transformer 203 for receiving the input audio signal Sin and converting it into two positive and negative high-voltage output audio signals So1 and So2 with equal strength. In one embodiment, the input audio signal Sin is an audio signal provided by a portable multimedia device such as an MP3 player, a CD player, or a smart phone. The power amplifier 204 receives the high-voltage DC VDCH provided by the high-voltage DC source 209 and amplifies the input audio signal Sin to an input audio power amplified signal Sin'. In one embodiment, the high voltage dc source 209 is provided by an ac-dc power converter (not shown) or a dc-dc power converter (not shown). The power amplifier 204 is a class AB amplifier or a class D amplifier, but is not limited thereto.
The capacitive plate-type electroacoustic actuator 201 includes a perforated electrode plate (perforated electrode plate)205 and a charged diaphragm plate (diaphragm)210, wherein the perforated electrode plate 205 has a plurality of openings 207. The charged diaphragm plate 210 includes a film body layer 208 and an electrode layer 206 with charges. In one embodiment, the film body layer 208 may be made of, but is not limited to, Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP). In one embodiment, the electrode layer 206 is made of aluminum, chromium, or other conductive materials, but is not limited thereto. The perforated electrode plate 205 and the charged diaphragm plate 210 receive the high-voltage output audio signals So1 and So2, respectively.
The capacitive plate type electro-acoustic actuator 201 can be regarded as a capacitor, and the capacitance C can be expressed according to the following equation:
wherein epsilonoIs the dielectric coefficient of vacuum, and epsilonrFor the relative dielectric constant, a represents the area of the charged diaphragm plate 210 and the perforated electrode plate 205, and d represents the distance between the charged diaphragm plate 210 and the perforated electrode plate 205.
The input audio power amplifying signal Sin' is amplified by the audio amplifying transformer 203 to N2/N1After multiplying, the signals are converted into output audio signals So1 and So2 to drive the capacitive plate type electro-acoustic actuator 201. Wherein
Or
In one embodiment, the ratio of the secondary side to the primary side of the audio amplifier transformer 203 is N2/N1Is 50-120. In another embodiment, the secondary side or primary side coil is a 0.12-0.02 phi enameled wire.
Power consumption W of the capacitive flat plate type electro-acoustic actuator 201CCan be expressed in terms of the following equation:
albeit potential difference (S)o1-So2)2Large, but capacitiveThe capacitance value C of the plate-type electro-acoustic actuator 201 is extremely small (typically between 20pF-20 nF). Therefore, the consumed power W of the capacitive plate type electro-acoustic actuator 201CThe power consumption of (2) is of the μ W class.
Advantageously, the audio amplifier transformer 203 not only amplifies the input audio power amplifying signal Sin' by N2/N1In addition, it also effectively forms a low-pass filter with the capacitive electroacoustic actuator to filter the high-frequency signal components outputted to the output audio signals So1 and So 2. In addition, the audio amplifying transformer 203 is modulated within a wide band of a higher frequency input audio signal Sin, so that a transformer with a high power and a low frequency and a wide band is not needed, and only a transformer with a higher center frequency and a lower cost is needed, thereby further effectively reducing the volume and the weight of the electroacoustic actuator system, and saving the power consumption of the electroacoustic actuator to prolong the service time of the portable electronic product. In one embodiment, the silicon steel sheet of the audio amplifier transformer 203 has low frequency, directivity and high magnetic permeability. In another embodiment, the Bobbin (Bobbin) of the audio amplifier transformer 203 is made of LCP material and the Pin (Pin) is C-shaped, so as to avoid the wire breakage caused by the too thin coil wire on the secondary side or the primary side.
Fig. 3 is a schematic circuit diagram of an audio driver for a flat-plate type electro-acoustic actuator according to another embodiment of the present invention. The audio driver 202 is coupled to the capacitive plate type electro-acoustic actuator 201. The audio driver 202 includes a power amplifier 204 and an audio amplifier transformer 203 for receiving the input audio signal Sin and converting it into two positive and negative high-voltage output audio signals So1 and So2 with equal strength. In one embodiment, the input audio signal Sin is an audio signal provided by a portable multimedia device such as an MP3 player, a CD player, or a smart phone. The power amplifier 204 receives the high-voltage DC VDCH provided by the high-voltage DC source 209 and amplifies the input audio signal Sin to an input audio power amplified signal Sin'. In one embodiment, the high voltage dc source 209 is provided by an ac-dc power converter (not shown) or a dc-dc power converter (not shown). The power amplifier 204 is a class AB amplifier or a class D amplifier, but is not limited thereto.
The capacitive plate-type electroacoustic actuator 201 includes a perforated electrode plate (perforated electrode plate)205 and a charged diaphragm plate (diaphragm)210, wherein the perforated electrode plate 205 has a plurality of openings 207. The charged diaphragm plate 210 includes a film body layer 208 and an electrode layer 206 with charges. In one embodiment, the film body layer 208 may be made of, but is not limited to, Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP). In one embodiment, the electrode layer 206 is made of aluminum, chromium, or other conductive materials, but is not limited thereto. The perforated electrode plate 205 receives the high voltage output audio signal So 1. One end of the charged diaphragm plate 210 is grounded.
The input audio power amplifying signal Sin' is amplified by the audio amplifying transformer 203 to N2/N1After multiplying, the signals are converted into output audio signals So1 and So2 to drive the capacitive plate type electro-acoustic actuator 201. Wherein,
or
Power consumption W of the capacitive flat plate type electro-acoustic actuator 201CCan be expressed in terms of the following equation:
in one embodiment, the ratio of the secondary side to the primary side of the audio amplifier transformer 203 is N2/N1Is 50-120. In another embodiment, the secondary side or primary side coil is a 0.12-0.02 phi enameled wire.
Albeit So1 2Large, but the capacitance value C of the capacitive plate-type electro-acoustic actuator 201 is extremely small (typically between 20pF-20 nF). Therefore, the consumed power W of the capacitive plate type electro-acoustic actuator 201CThe power consumption of (2) is of the μ W class.
Advantageously, the audio amplifier transformer 203 not only amplifies the input audio power amplifying signal Sin' by N2/N1In addition, it also effectively forms a low-pass filter with the capacitive electroacoustic actuator for filtering out the high-frequency signal component outputted to the output audio signal So 1. In addition, the audio amplifying transformer 203 is modulated within a wide band of a higher frequency input audio signal Sin, so that a transformer with a high power and a low frequency and a wide band is not needed, and only a transformer with a higher center frequency and a lower cost is needed, thereby further effectively reducing the volume and the weight of the electroacoustic actuator system, and saving the power consumption of the electroacoustic actuator to prolong the service time of the portable electronic product. In one embodiment, the silicon steel sheet of the audio amplifier transformer 203 has low frequency, directivity and high magnetic permeability. In another embodiment, the Bobbin (Bobbin) of the audio amplifier transformer 203 is made of LCP material and the Pin (Pin) is C-shaped, so as to avoid the wire breakage caused by the too thin coil wire on the secondary side or the primary side.
The foregoing detailed description and drawings are merely illustrative of the present invention as it is commonly practiced. It will be apparent that various additions, modifications and substitutions are possible without departing from the scope and spirit of the invention as defined in the accompanying claims. It will be appreciated by those skilled in the art that the present invention may be modified in form, structure, arrangement, proportions, materials, elements, and components and otherwise, used in the practice of the invention, depending upon the particular environment and operating requirements, without departing from the principles of the present invention. Accordingly, the presently disclosed embodiments are meant to be illustrative only and not limiting, the scope of the invention being indicated by the appended claims and their legal equivalents, rather than by the foregoing description.
The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications are possible within the scope of the invention claimed. Other modifications, variations and alternatives are also possible. The claims are to cover all such equivalents.
Claims (10)
1. An audio driver for a flat-plate type electro-acoustic actuator, the flat-plate type electro-acoustic actuator comprising a perforated electrode plate and a charged diaphragm plate, the audio driver being coupled to the flat-plate type electro-acoustic actuator, wherein the audio driver comprises:
a power signal amplifier for receiving an input audio signal and converting the input audio signal into an input audio power amplified signal; and
the audio amplifying transformer is used for receiving the input audio power amplifying signal and converting the input audio power amplifying signal into two high-voltage output audio signals, and the two high-voltage output audio signals are respectively coupled with the perforated electrode plate and the charged vibrating diaphragm plate;
wherein, the audio amplifying transformer and the flat-plate type electro-acoustic actuating device effectively form a low-pass filter.
2. The audio driver for a flat-panel electroacoustic actuator of claim 1, further comprising: an AC-DC power converter or a DC-DC power converter for providing high voltage DC to the power amplifier.
3. The audio driver of claim 1, wherein the power amplifier is a class AB amplifier or a class D amplifier.
4. The audio driver for a flat panel electroacoustic actuator of claim 1, wherein the input audio signal is provided by an MP3 player, a CD player, or a smart phone.
5. The audio driver for a flat panel electroacoustic actuator of claim 1, wherein the charged diaphragm plate comprises a membrane body layer and an electrode layer with charges.
6. An audio driver for a flat-plate type electro-acoustic actuator, the flat-plate type electro-acoustic actuator comprising a perforated electrode plate and a charged diaphragm plate, the audio driver being coupled to the flat-plate type electro-acoustic actuator, wherein the audio driver comprises:
a power signal amplifier; for receiving an input audio signal and converting the input audio signal into an input audio power amplifying signal; and
the audio amplifying transformer is used for receiving the input audio power amplifying signal and converting the input audio power amplifying signal into a high-voltage output audio signal, the high-voltage output audio signal is coupled with the perforated electrode plate, and the charged vibrating membrane plate is coupled with the grounding end;
wherein, the audio amplifying transformer and the flat-plate type electro-acoustic actuating device effectively form a low-pass filter.
7. The audio driver for a flat-panel electroacoustic actuator of claim 6, further comprising: an AC-DC power converter or a DC-DC power converter for providing high voltage DC to the power amplifier.
8. The audio driver of claim 6, wherein the power amplifier is a class AB amplifier or a class D amplifier.
9. The audio driver for a flat panel electroacoustic actuator of claim 6, wherein the input audio signal is provided by an MP3 player, a CD player or a smart phone.
10. The audio driver for a flat panel electroacoustic actuator of claim 6, wherein the charged diaphragm plate comprises a membrane body layer and an electrode layer with charges.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201120049038XU CN201957231U (en) | 2011-02-28 | 2011-02-28 | Audio signal driver for flat-plate electroacoustic actuator |
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| CN201120049038XU CN201957231U (en) | 2011-02-28 | 2011-02-28 | Audio signal driver for flat-plate electroacoustic actuator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651836A (en) * | 2011-02-28 | 2012-08-29 | 千如电机工业股份有限公司 | Audio signal driver for flat-plate electroacoustic actuator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651836A (en) * | 2011-02-28 | 2012-08-29 | 千如电机工业股份有限公司 | Audio signal driver for flat-plate electroacoustic actuator |
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Granted publication date: 20110831 Termination date: 20130228 |