CN106303822B - Mobile phone audio interface communication equipment - Google Patents
Mobile phone audio interface communication equipment Download PDFInfo
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- CN106303822B CN106303822B CN201510359110.1A CN201510359110A CN106303822B CN 106303822 B CN106303822 B CN 106303822B CN 201510359110 A CN201510359110 A CN 201510359110A CN 106303822 B CN106303822 B CN 106303822B
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Abstract
The invention relates to the technical field of communication, and provides mobile phone audio interface communication equipment which comprises an audio interface, a power supply control module, a power supply and a functional circuit module, wherein the audio interface comprises a microphone pin and a GND pin; the mobile phone audio interface communication equipment provided by the invention can reduce unnecessary consumption of a battery, prolong the service life of the mobile phone audio interface communication equipment, and simultaneously protect the loss of the functional circuit module caused by the fact that the functional circuit module is always in a power-on state.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a mobile phone audio interface communication device.
Background
With the rapid development of mobile communication technology, mobile phones have become very popular communication tools in people's daily life, and more applications and peripherals thereof are developed based on mobile phones, which expand the functions of mobile phones and make them far beyond the scope of simple communication tools, such as mobile phone microscopes, mobile phone micro projectors, wireless handheld scanners, health detectors, mobile phone 20M audio transmitters, mobile phone card readers, air detectors, etc., which are connected with mobile phones in a wireless or wired manner, in the wired connection manner, the peripherals are mainly connected with existing interfaces on mobile phones, such as audio interfaces, data transmission interfaces, etc., however, the same functional interfaces provided by different types of mobile phones are different in form, and the power interface is the more common difference, there are therefore many different types of interfaces between the peripheral device and the handset.
The mobile phone audio interface communication equipment refers to peripheral equipment which communicates with a mobile phone through a mobile phone audio interface, the audio interfaces of the existing mainstream mobile phones conform to national standards or international standards, the audio interfaces of the existing mainstream mobile phones comprise a left sound channel, a right sound channel, a microphone and a ground wire, and the mobile phone audio interface communication equipment performs signal interaction with the mobile phone through the left sound channel or the right sound channel and the microphone interface.
The functional circuit module in the mobile phone audio interface communication device is mainly powered by an internal battery, and no matter whether the mobile phone communication device is in a working state or not, the battery in the mobile phone audio interface communication device is continuously powered to the functional circuit, and the battery is in a continuous consumption state, so that the battery is easily consumed, and the functional circuit is also unnecessarily consumed.
Disclosure of Invention
In order to solve the problems existing in the background technology, the invention provides a mobile phone audio interface communication device, which is characterized in that a power supply control module is additionally arranged, so that a battery can be connected with a functional circuit module to be powered on when the mobile phone audio interface communication device is connected with a mobile phone, and the battery is disconnected with the functional circuit module and is in a non-powered state when the mobile phone audio device is not connected with the mobile phone.
The invention provides a mobile phone audio interface communication device, comprising: the audio interface comprises a microphone pin and a GND pin; the power supply control module comprises a rectifying element, an NPN type triode and a PNP type triode, wherein the rectifying element is connected to the pin of the microphone and the pin of the GND and is connected with the base electrode of the NPN type triode, the emitting electrode of the NPN type triode is grounded, the collector electrode of the NPN type triode is connected with the base electrode of the PNP type triode, the emitting electrode of the PNP type triode is connected with the positive electrode of the power supply, and the collector electrode of the PNP type triode is connected with the functional circuit module.
In a preferred embodiment, the audio interface communication device further comprises two anti-jamming elements, wherein the microphone pin is grounded through one of the anti-jamming elements, and the GND pin is grounded through the other anti-jamming element.
In a preferred embodiment, the anti-tamper element includes a first resistor and a schottky diode, the microphone pin and the GND pin are connected to the anode of the schottky diode through the first resistor of the corresponding anti-tamper element, and the cathode of the schottky diode is grounded.
In a preferred embodiment, the power control module further includes a second resistor, and the rectifying element is connected to the base of the NPN transistor through the second resistor.
In a preferred embodiment, the power control module further includes a third resistor, and the collector of the NPN transistor is connected to the base of the PNP transistor through the third resistor.
In a preferred embodiment, the power control module further includes a first filter element, and the first filter element is connected across the base and the emitter of the NPN transistor.
In a preferred embodiment, the power control module further includes a second filter element, and the second filter element is connected across the collector of the PNP transistor and ground.
In a preferred embodiment, the rectifying element is composed of two bi-schottky diodes, each bi-schottky diode comprises a cathode pin, an anode pin and a common pin, wherein the common pin of one bi-schottky diode is connected with the microphone pin, the common pin of the other bi-schottky diode is connected with the GND pin, the cathode pins of the two bi-schottky diodes are connected with the ground, and the anode pin is connected with the base of the NPN type triode.
In a preferred embodiment, the audio interface further comprises two earphone pins, wherein one earphone pin is connected to the functional circuit module.
In a preferred embodiment, one of the earphone pins is grounded through a fourth resistor, and the other earphone pin is grounded through a fifth resistor.
When the mobile phone audio interface communication equipment provided by the invention is connected with the mobile phone audio interface, the bias voltage provides bias current for the NPN type triode through the rectifier element to enable the NPN type triode to enter a saturated state, so that the PNP type triode is saturated, a battery and a functional circuit module are conducted, the battery supplies power for the functional circuit module, and the mobile phone audio interface communication equipment is started; when the mobile phone audio interface communication equipment provided by the invention is disconnected with a mobile phone, no bias voltage is input, so that the NPN type triode is in a cut-off state, the PNP type triode cannot be saturated, the battery is not communicated with the functional circuit module, and the mobile phone audio interface communication equipment is in a power-off state. Therefore, the mobile phone audio interface communication device provided by the invention skillfully utilizes the bias voltage existing between the ground wire and the microphone in the mobile phone audio interface to control the connection between the battery and the functional circuit module, so that when the mobile phone audio interface communication device is connected into a mobile phone, the battery supplies power to the functional circuit module, and when the mobile phone audio interface communication device is pulled out, the power supply is stopped, the unnecessary consumption of the battery is reduced, the service life of the mobile phone audio interface communication device is prolonged, and meanwhile, the loss of the functional circuit module caused by the fact that the functional circuit module is always in a power-on state is.
Drawings
FIG. 1 is a schematic circuit diagram of a communication device of an audio interface of a mobile phone according to a preferred embodiment of the invention;
FIG. 2 is a schematic circuit diagram of a communication device with an audio interface of a mobile phone according to another preferred embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a mobile phone audio interface communication device according to another preferred embodiment of the invention.
Description of the reference symbols:
audio interface Y
Microphone pin Ym
GND pin Yg
Earphone pin Yr
Earphone pin Yl
Power supply control module 10
Rectifier element 11
NPN type triode Q1
PNP type triode Q2
Double schottky diode U1
Double schottky diode U2
Anode pin 2
Second resistor R2
Third resistor R3
First filter element 12
Capacitor C1
Second filter element 13
Capacitor C2
Capacitor C3
Battery BT
Anti-interference element 30
First resistor R1a
Schottky diode D1
Interference suppression element 40
First resistor R1b
Schottky diode D2
Fourth resistor R4
Fifth resistor R5
Detailed Description
In order to make the technical solution of the present invention and its advantages more clear and detailed, it will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a mobile phone audio interface communication device according to a preferred embodiment of the invention. As shown in fig. 1, the audio interface communication device of the mobile phone provided by the present embodiment includes an audio interface Y, a power control module 10, a battery BT and a functional circuit module 20.
Specifically, the audio interface Y includes four pins, which are a microphone pin Ym, a GND pin Yg, and two earphone pins Yr and Yl, respectively, when the mobile phone audio interface communication device is connected to the audio interface of the mobile phone, the microphone pin Ym of the audio interface Y of the mobile phone audio interface communication device is connected to the microphone pin of the mobile phone audio interface, the GND pin Yg is connected to the ground pin of the mobile phone audio interface, the earphone pin Yr is connected to the right channel pin of the mobile phone audio interface, and the earphone pin Yl is connected to the left channel pin of the mobile phone audio interface. In this embodiment, the microphone pin Ym and the earphone pin Yl are connected to the functional circuit module 20 for data signal transmission between the mobile phone audio interface communication device and the mobile phone, and the earphone pin Yr is grounded.
The power control module 10 includes a rectifying device 11, an NPN transistor Q1, and a PNP transistor Q2. As shown in the figure, in the present embodiment, the rectifying element 11 is composed of two sets of dual schottky diodes U1 and U2, the dual schottky diodes U1 and U2 both include a cathode pin 1, an anode pin 2 and a common pin 3, wherein the common pin 3 of the dual schottky diode U1 is connected to the microphone pin Ym, the cathode pin 1 is connected to the cathode pin 1 of the dual schottky diode U2 and grounded, the common pin 3 of the dual schottky diode U2 is connected to the GND pin Yg, and the anode pin 2 is connected to the anode pin 2 of the dual schottky diode U1 and connected to the base of the NPN transistor Q1. The emitter of the NPN type triode Q1 is grounded, the collector is connected to the base of the PNP type triode Q2, the emitter of the PNP type triode Q2 is connected to the positive electrode of the battery BT, and the collector of the PNP type triode Q2 is connected to the functional circuit module 20. The working principle of the power control module 10 in this embodiment is that when the mobile phone audio interface communication device is connected to a mobile phone, a bias voltage is generated between the microphone pin Ym and the GND pin Yg, and the bias voltage is transmitted to the NPN type triode Q1 through the rectifying element 11 to provide a bias current for the BE junction (i.e., the base and the emitter) of the NPN type triode Q1, so that the NPN type triode Q1 is saturated, and when the Q1 is saturated, the BE junction of the PNP type triode Q2 is reversely biased to generate a bias current, so that the PNP type triode Q2 is saturated, and the emitter of the PNP type triode Q2 is connected to the collector, so that the battery BT supplies power to the functional circuit module 20 through the PNP type triode Q2. However, when the audio interface communication device of the mobile phone is not connected to the mobile phone, since no bias voltage is introduced, the PNP transistor Q2 is not saturated, and the emitter and the collector of the PNP transistor Q2 are disconnected, so that the battery BT and the functional circuit module 20 cannot be conducted to stop supplying power to the battery BT. Therefore, unnecessary consumption of the battery can be reduced, the service life of the battery can be prolonged, and meanwhile, the loss of the functional circuit module caused by long-time power-on can be prevented.
It should be noted that, in the present embodiment, the rectifying element 11 can convert the bias voltage between the microphone pin Ym and the GND pin Yg into the control dc signal in the power control module 10, and the rectifying element 11 is formed by two double schottky diodes, which has a smaller tube voltage drop, and is also well applicable when the bias voltage of some mobile phones is smaller, so that the application range of the technical scheme of the present embodiment can be expanded. It is understood that in other embodiments of the present invention, the rectifier element 11 may be formed by other elements, for example, four diodes, and it can be seen that those skilled in the art can select the formation of the rectifier element 11 according to different actual product requirements.
In this embodiment, the power supply of the functional circuit module is provided by a battery BT, which may be a lithium battery or other storage batteries, but the invention is not limited thereto. The negative electrode of the battery BT is grounded.
The functional circuit module 20 is a module for specifically implementing actual functions of the mobile phone audio interface communication device, and implements different functions according to different product designs, for example, a mobile phone card reader, which is a mobile phone audio interface communication device capable of performing bank card payment through a mobile phone. The embodiments of the present invention mainly solve the problems related to battery power supply, and are not related to the functions implemented by the functional circuit module, so that no specific description is provided herein.
As described above, when the audio interface communication device of the mobile phone is connected to the mobile phone, a bias voltage exists between the microphone pin Ym and the GND pin Yg, and the actual magnitude of the bias voltage is related to the type of the mobile phone, but generally belongs to a small signal, and the power control module 10 works based on the small signal, so as to avoid interference from an external electrical signal. Referring to fig. 2, fig. 2 is a schematic circuit diagram of a mobile phone audio interface communication device according to another preferred embodiment of the invention. As shown in fig. 2, the difference between this embodiment and the embodiment shown in fig. 1 is that the audio interface communication device of the mobile phone provided by this embodiment further includes two interference-preventing elements 30 and 40, the microphone pin Ym is grounded through the interference-preventing element 30, and the GND pin Yg is grounded through the interference-preventing element 40. Specifically, the anti-tamper element 30 includes a first resistor R1a and a schottky diode D1, the microphone pin Ym is connected to the first resistor R1a, the first resistor R1a is connected to the anode of the schottky diode D1, in other words, the microphone pin Ym is connected to the anode of the schottky diode D1 through the first resistor R1a, the cathode of the schottky diode D1 is grounded, similarly, the anti-tamper element 40 includes a first resistor R1b and a schottky diode D2, the GND pin Yg is connected to the first resistor R1b, the first resistor R1b is connected to the anode of the schottky diode D2, in other words, the GND Yg is connected to the anode of the schottky diode D2 through the first resistor R1b, and the cathode of the schottky diode D2 is grounded. In this embodiment, the anti-interference elements 30 and 40 form a leakage circuit to discharge static electricity in the audio interface communication device of the mobile phone, so as to prevent static electricity from interfering with the audio interface communication device of the mobile phone, prevent the power control module 10 from generating a malfunction due to static electricity, and improve the performance stability of the audio interface communication device of the mobile phone. It should be noted that other components and connection relationships of the mobile phone audio interface communication device in this embodiment are the same as those of the mobile phone audio interface communication device in the embodiment shown in fig. 1, and therefore, detailed description thereof is omitted.
In another preferred embodiment of the present invention, in order to protect the components in the circuit or filter noise, a resistor and a filter element are added to achieve the corresponding purpose, please refer to fig. 3, and fig. 3 is a schematic circuit diagram of a mobile phone audio interface communication device according to another preferred embodiment of the present invention. As shown in fig. 3, the difference between the mobile phone audio interface communication device of the present embodiment and the mobile phone audio interface communication device provided in the embodiment shown in fig. 1 is that a protection resistor and a filter element are added. The power control module 10 of the mobile phone audio interface communication device further includes a second resistor R2, a third resistor R3, a first filter element 12, and a second filter element 13.
Specifically, the second resistor R2 is connected to the rectifying element 11 and the NPN transistor Q1, in other words, the rectifying element 11 is connected to the base of the NPN transistor Q1 through the second resistor R2, and since the NPN transistor Q1 has limited voltage-withstanding capability, the current of the circuit can be limited by adding the second resistor R2, so that thermal breakdown of the NPN transistor Q1 due to excessive current is prevented, the aging speed of the NPN transistor Q1 is slowed down, and the NPN transistor Q1 can stably and permanently operate.
The third resistor R3 is connected to the NPN transistor Q2 and the PNP transistor Q2, in other words, the collector of the NPN transistor Q1 is connected to the base of the PNP transistor Q2 through the third resistor R3, and the function of the third resistor R3 is the same as that of the second resistor R2, so that the PNP transistor Q2 is protected by the third resistor R3.
In this embodiment, the first filter element 12 is composed of a capacitor C1, and is bridged between the base and the emitter of the NPN type triode, and the capacitor C1 is provided to filter noise of the signal transmitted to the NPN type triode Q1, thereby preventing malfunction of the NPN type triode Q1 due to noise. It should be noted that the first filter element 12 can also be implemented in other ways, and those skilled in the art can selectively replace the first filter element according to the actual requirement of the product, and the invention is not limited thereto.
The second filter element 13 includes capacitors C2 and C3, both of which are connected between the collector of the PNP transistor Q2 and ground, and can provide a filtering function for the functional circuit module 20 to prevent the functional circuit module 20 from being affected by signals in the power control module 10 or external noise, and similarly, the second filter element 13 can be implemented by other methods, and those skilled in the art can selectively replace the capacitors according to actual requirements of products, which is not limited thereto.
In addition, the audio interface communication device of the mobile phone provided by this embodiment further includes a fourth resistor R4 and a fifth resistor R5, which are respectively connected to the earpiece pins Yr and Yl, specifically, the earpiece pin Yr is grounded through the fourth resistor R4, and the earpiece pin Yl is grounded through the fifth resistor R5.
In this embodiment, the second resistor R2 and the third resistor R3 are added to provide protection for the NPN transistor Q1 and the PNP transistor Q2, respectively, so that they can operate more stably and for a longer time; by additionally arranging the first filter element 12 and the second filter element 13, noise waves can be filtered by the NPN type triode Q1 and the functional circuit module 20 respectively, and misoperation is avoided; the input signal is stabilized by additionally arranging the fourth resistor R4 and the fifth resistor R5, so that the circuit can work more accurately.
It can be understood that the resistors and the filter elements added in this embodiment may be adjusted and selected according to actual situations, not all of which are necessarily included in the mobile phone audio interface communication device, and the resistors and the filter elements added in this embodiment and the anti-interference element in the embodiment shown in fig. 2 may coexist in the same embodiment without affecting each other.
In summary, the mobile phone audio interface communication device provided by the present invention connects the battery and the functional circuit module through the power control module, so that the battery of the mobile phone audio interface communication device is connected with the functional circuit module and supplies power to the functional circuit module only when the mobile phone audio interface communication device is connected with the mobile phone, and when the mobile phone audio interface communication device is disconnected from the mobile phone, the connection between the battery and the functional circuit module is disconnected, so as to stop supplying power to the functional circuit module, thereby avoiding unnecessary consumption of the battery, prolonging the service life of the battery, and protecting the functional circuit module. In addition, an anti-interference element, a resistor and a filter element are additionally arranged in the circuit, so that protection is provided for corresponding components, relevant noise waves are released and filtered out for the circuit, misoperation of the circuit due to interference of the noise waves is avoided, and the performance and stability of the mobile phone audio interface communication equipment are improved.
It is understood that the types and parameters of the electronic components involved in the present invention can be selected by those skilled in the art according to the actual needs of the product, and all of them should fall within the scope of the present invention.
Claims (10)
1. A handset audio interface communication device, comprising: the audio interface comprises a microphone pin and a GND pin; the power supply control module comprises a rectifying element, an NPN type triode and a PNP type triode, wherein the rectifying element is connected to the pin of the microphone and the pin of the GND and is connected with the base electrode of the NPN type triode, the emitting electrode of the NPN type triode is grounded, the collector electrode of the NPN type triode is connected with the base electrode of the PNP type triode, the emitting electrode of the PNP type triode is connected with the positive electrode of the power supply, and the collector electrode of the PNP type triode is connected with the functional circuit module.
2. The handset audio interface communication device of claim 1 further comprising two tamper resistant elements, wherein the microphone pin is grounded through one of the tamper resistant elements and the GND pin is grounded through the other tamper resistant element.
3. The handset audio interface communication device of claim 2 wherein the tamper resistant element comprises a first resistor and a schottky diode, the microphone pin and the GND pin being connected to the anode of the schottky diode through the first resistor of the corresponding tamper resistant element, the cathode of the schottky diode being connected to ground.
4. The audio interface communication device of claim 1, wherein the power control module further comprises a second resistor, and the rectifying element is connected to the base of the NPN transistor through the second resistor.
5. The mobile phone audio interface communication device as claimed in claim 1, wherein the power control module further comprises a third resistor, and the collector of the NPN transistor is connected to the base of the PNP transistor through the third resistor.
6. The handset audio interface communication device of claim 1 wherein the power control module further comprises a first filter element connected across the base and emitter of the NPN transistor.
7. The handset audio interface communication device of claim 1 wherein the power control module further comprises a second filter element coupled across the collector of the PNP transistor and ground.
8. The handset audio interface communication device of claim 1 wherein the rectifying element is comprised of two bi-schottky diodes, the bi-schottky diodes including a cathode pin, an anode pin and a common pin, wherein the common pin of one of the bi-schottky diodes is connected to the microphone pin, the common pin of the other of the bi-schottky diodes is connected to the GND pin, the cathode pins of the two bi-schottky diodes are connected to ground, and the anode pin is connected to the base of the NPN transistor.
9. The handset audio interface communication device of claim 1 wherein the audio interface further comprises two earpiece pins, one of the earpiece pins being connected to the functional circuit module.
10. The handset audio interface communication device of claim 9 wherein one of said earpiece pins is connected to ground through a fourth resistor and the other of said earpiece pins is connected to ground through a fifth resistor.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378087A (en) * | 2010-07-23 | 2012-03-14 | 飞兆半导体公司 | Audio jack reset |
| CN104317761A (en) * | 2014-10-27 | 2015-01-28 | 飞天诚信科技股份有限公司 | Multi-interface mobile security equipment with power management and operation method of multi-interface mobile security equipment |
| CN204795567U (en) * | 2015-06-25 | 2015-11-18 | 朗新科技股份有限公司 | Cell -phone audio interface communication equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090027112A1 (en) * | 2007-07-26 | 2009-01-29 | Chin Li | Controllable precision transconductance |
| CN101841588B (en) * | 2009-03-17 | 2014-04-30 | 深圳富泰宏精密工业有限公司 | Audio interface device and electronic device using same |
| CN102025282B (en) * | 2009-09-17 | 2012-11-21 | 群康科技(深圳)有限公司 | Power control circuit and electronic device provided with same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378087A (en) * | 2010-07-23 | 2012-03-14 | 飞兆半导体公司 | Audio jack reset |
| CN104317761A (en) * | 2014-10-27 | 2015-01-28 | 飞天诚信科技股份有限公司 | Multi-interface mobile security equipment with power management and operation method of multi-interface mobile security equipment |
| CN204795567U (en) * | 2015-06-25 | 2015-11-18 | 朗新科技股份有限公司 | Cell -phone audio interface communication equipment |
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