CN209963815U - Charging adapter - Google Patents

Abstract

A charging adaptor comprises a controller, a first female plug interface, a second female plug interface, a signal processing circuit, a charging circuit and a male plug connector, wherein the first female plug interface and the second female plug interface are used for being connected with a plug of external equipment; the charging circuit switches between a first state of taking power from the electronic equipment terminal and a second state of supplying power by the adapter according to the state of the adapter connected with the female plug interface.

Description

Charging adapter

Technical Field

The utility model relates to an extension interface technical field, in particular to charging adapter of interface that compatibility is better, can multiple electronic equipment terminal of adaptation.

Background

With the rapid development of intelligent products, products in various industries are improved and innovated to a greater extent, particularly the product industries of smart phones and tablet computers, and a large number of different types of products emerge based on the light, clear, thin and narrow concepts.

At present, in order to reduce the occupied space of the connector, reduce the terminal cost, enhance the external tone quality experience, and the USB association pushes the TYPE C digital interface and the apple ISO lighting digital interface, the 3.5 interface of the analog audio is cancelled by most mobile phones, and is only designed as a single data connector (TYPE C or lighting interface), which brings the new experience but inevitably has the following problems: on one hand, because only one physical interface is provided, the music listening and the charging of the telephone cannot be synchronously carried out; on the other hand, the existing electronic equipment with the analog audio 3.5 interface still has a large holding capacity, and the electronic equipment with the TPYE C interface cannot be compatible with the original line control earphone with the analog audio 3.5 interface of the apple intelligent equipment terminal.

Aiming at the problems, various charging switching products are available on the market at present, and have defects, poor compatibility and inconsistent function deficiency.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that exists now, the embodiment of the utility model provides a can compatible all kinds of electronic equipment terminal interface, and only the electronic equipment terminal of a physical interface can realize making a call and listen to the music and charge the adapter that charges of going on in step.

The embodiment of the utility model provides a technical scheme is so realized:

a charging adaptor comprises a controller, a first female plug interface and a second female plug interface which are connected with the input end of the controller, a signal processing circuit and a charging circuit which are connected between the first female plug interface and the second female plug interface and the input end of the controller, and a male plug connector which is connected with the output end of the controller, wherein the first female plug interface and the second female plug interface are used for being connected with a plug of an external device, the male plug connector is used for being connected with a socket of an electronic device terminal, the signal processing circuit comprises a detection circuit and a bias circuit, the detection circuit is used for detecting whether the first female plug interface or the second female plug interface is plugged into an earphone, and the signal processing circuit detects the state of the earphone plugged by the first female plug interface or the second female plug interface through the detection circuit, the bias circuit forms bias voltage with set magnitude, an MIC signal input end is enabled according to the bias voltage, and the controller matches the earphone with the electronic equipment terminal according to the input of the MIC signal input end; the charging circuit switches between a first state of taking electricity from the electronic equipment terminal and a second state of supplying power by the adapter according to the state of the adapter connected with the first female plug interface or the second female plug interface.

The signal processing circuit further comprises a signal amplifying circuit and a first filter circuit, wherein the signal amplifying circuit is used for amplifying alternating current signals of received key signals input by the line control earphone, and the first filter circuit is used for filtering direct current signal components of the amplified signals.

The signal amplification circuit comprises a triode, the base electrode of the triode is connected with the MIC signal input end, the collector electrode of the triode is connected with the output end of the bias voltage, and the emitter electrode of the triode is grounded; a junction between the collector and the output of the bias voltage is formed as an amplified signal output.

The first filter circuit comprises a filter resistor connected with the amplified signal output end and a filter capacitor connected between the filter resistor and the ground, and a node between the filter resistor and the filter capacitor is formed as a direct current signal component output end.

The controller comprises a first input end and a second input end which are respectively connected with the amplified signal output end and the direct current signal component output end, the amplified alternating current signal and the amplified direct current component signal are compared to determine a corresponding carrier signal, and a corresponding key signal is determined according to the carrier frequency of the carrier signal.

The detection circuit comprises an earphone identification switch, the earphone identification switch identifies the earphone type according to the comparison of the voltage of the backflow ground wire contact and the MIC contact of the inserted earphone and the internal voltage, and the MIC signal input end is enabled according to the earphone type.

The bias circuit comprises a divider resistor connected with a power supply end of a power supply and a second filter circuit connected between the MIC contact and the power supply end of the power supply, the other end of the divider resistor is formed into an output end of the bias voltage, and the second filter circuit is used for filtering interference signals.

The charging circuit comprises a switch circuit connected between the first female plug interface or the second female plug interface and a male plug connector, the switch circuit is in one-way conduction with the male plug connector when the first female plug interface or the second female plug interface is not connected with the adapter, and power is taken from the connected electronic equipment terminal through the male plug connector; the switch circuit is connected with the first female plug interface or the second female plug interface when the adapter is connected with the female plug interface and the male plug connector respectively, and the switch circuit is conducted in two directions and gets electricity from the adapter through the female plug interface.

The switching circuit comprises a first field effect tube, a second field effect tube and a third field effect tube, wherein the first field effect tube and the second field effect tube share a grid electrode and share a common source electrode, drain electrodes of the first field effect tube and the second field effect tube are connected with grid electrodes of the first field effect tube and the second field effect tube, the drain electrodes of the first field effect tube and the second field effect tube are respectively connected with a female plug connector and a male plug connector, and the grid electrode and a source electrode of the third field effect tube are connected with the ground.

The controller determines matched charging power according to the charging parameters of the adapter and the charging parameters of the electronic equipment terminal, and controls the charging circuit to charge the electronic equipment terminal through the male plug connector according to the matched charging power.

The charging adaptor provided by the above embodiment includes a signal processing circuit and a charging circuit connected between the first female jack interface and the second female jack interface and the input end of the controller, wherein the signal processing circuit includes a detection circuit and a bias circuit, the detection circuit can detect whether the first female jack interface or the second female jack interface is inserted into the earphone, the bias circuit forms a bias voltage with a set size according to the state of the earphone inserted into the first female jack interface or the second female jack interface, the MIC signal input end is enabled according to the bias voltage, the controller matches the earphone with the electronic device terminal according to the input of the MIC signal input end, thus, the compatibility problem of the electronic device terminals with different interfaces to different types of earphones can be solved through the identification of the detection circuit and the enablement of the controller, and the use of different types of earphones on the electronic device terminals with different interfaces has no barrier, seamless switching can be realized; the charging circuit switches between a first state of taking electricity from the electronic equipment terminal and a second state of supplying power by the adapter according to the state of the adapter connected with the first female plug interface or the second female plug interface, so that the charging switching of supplying power to the adapter can be automatically realized according to the adapter connected with the female plug interface, the synchronous operation of calling and listening to music and charging is realized, and the cruising problem of the electronic equipment terminal is effectively solved.

Drawings

Fig. 1 is a schematic view illustrating an application of a charging adaptor according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a charging adaptor according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a detection circuit according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a bias circuit according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an amplifying circuit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a filter circuit according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a controller according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a switch circuit according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the drawings and specific embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the following description, reference is made to the expression "some embodiments" which describes a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

Referring to fig. 1, an application of a charging adaptor 100 provided in the embodiment of the present application is schematically illustrated, where the charging adaptor 100 includes a first female plug interface 11 and a second female plug interface 12 for connecting with a plug of an external device, and a plurality of male plug connectors 13 for connecting with sockets of different electronic device terminals. The plug of the external device may refer to a headset, a charging cord, an adapter, etc. As an optional embodiment, the first female jack 11 is an earphone jack with a 3.5 interface, and can be used to connect various earphones, such as a microphone-controlled earphone with an apple lightning interface protocol; the second female plug interface 12 is a Type C female socket plug interface and can be used for connecting a charging wire and various adapters, such as a PD protocol adapter and a QC protocol adapter; it should be noted that, here, the first female connector 11 and the second female connector 12 are only used as examples, and they may be interchanged with each other, and the description is not limited to this. Secondly, the adaptor should be understood broadly, and includes various connection modes capable of charging the electronic device terminal. The male plug 13 includes plugs for connecting with sockets of electronic device terminals with different interfaces, such as an apple lightning interface device plug, a Type C interface device plug, a 3.5 interface device plug, etc., and connects devices such as an apple lightning mobile phone, an apple lightning tablet, etc., a Type C mobile phone, a Type C tablet, etc., and 3.5 interface electronic devices, respectively. In an optional applied scene, the user need use apple drive-by-wire earphone and Type C cell-phone listening music, can adopt the first female interface 11 of inserting of adapter 100 of charging to be connected with apple drive-by-wire earphone, the female PD protocol adapter of inserting of interface 12 connection of second, public bayonet joint adopts Type C interface equipment bayonet joint and Type C cell-phone socket to be connected, realizes listening music while charging through apple drive-by-wire earphone, and the equal normal use of key operation of drive-by-wire earphone.

Referring to fig. 2, a schematic structural diagram of a charging adaptor 100 provided in an optional embodiment is shown, where the charging adaptor 100 includes a controller 20, a first female plug interface 11 and a second female plug interface 12 connected to an input end of the controller 20, a signal processing circuit 30 and a charging circuit 40 connected between the first female plug interface 11 and the second female plug interface 12 and an input end of the controller 20, and a male plug connector 13 connected to an output end of the controller 20, where the first female plug interface 11 and the second female plug interface 12 are used for being connected to plugs of external devices, the male plug connectors 13 are respectively used for being connected to sockets of different electronic device terminals, the signal processing circuit 30 includes a detection circuit 31 and a bias circuit 32, the detection circuit 31 is used for detecting whether the first female plug interface 11 or the second female plug interface 12 is inserted into an earphone, the signal processing circuit 30 detects the state of the earphone inserted into the first female plug interface 11 or the second female plug interface 12 through the detection circuit 31, the bias circuit 32 forms a bias voltage with a set magnitude, an MIC signal input terminal MIC _ IN is enabled according to the bias voltage, and the controller 20 matches the earphone with the electronic device terminal according to the input of the MIC signal input terminal MIC _ IN; the charging circuit 40 switches between a first state of taking power from the electronic device terminal and a second state of supplying power by the adapter according to the state of the adapter connected to the first female plug interface 11 or the second female plug interface 12.

Wherein, the charging adaptor 100 includes a signal processing circuit 30 and a charging circuit 40 connected between the first female plug interface 11 and the second female plug interface 12 and the input end of the controller 20, the signal processing circuit 30 includes a detection circuit 31 and a bias circuit 32, the detection circuit 31 forms a bias voltage with a set size by the bias circuit 32 according to the state of the earphone inserted into the first female plug interface 11 or the second female plug interface 12, the MIC _ IN signal input end is enabled according to the bias voltage, the controller 20 matches the earphone with the electronic equipment terminal according to the input of the MIC _ IN signal input end, thus, the compatibility problem of the electronic equipment terminals with different interfaces to different types of earphones can be solved through the identification of the detection circuit 31 and the conversion of the controller 20, the use of different types of earphones on various electronic equipment terminals with different interfaces has no barrier, seamless handover can be achieved. Taking the earphone type including a 3.5 interface national standard earphone and a American standard earphone as an example, the sequence of contacts IN the headset connectors of the national standard earphone and the American standard earphone is different, so that different electronic equipment terminals need to be correctly adapted to the headset to be normally used, the type of the inserted earphone is correctly identified through the detection circuit 31 IN the signal processing circuit 30, the bias circuit 32 forms a bias voltage with a set size, and the MIC signal input end MIC _ IN is enabled according to the bias voltage, so that the inserted earphone can be correctly connected with the electronic equipment terminal. The charging circuit 40 switches between a first state of taking electricity from the electronic equipment terminal and a second state of supplying power by the adapter according to the state of the adapter connected with the first female plug interface 11 or the second female plug interface 12, so that the charging switching of the adapter for supplying power can be automatically realized according to the adapter connected with the female plug interface, the synchronous operation of calling and listening to music and charging is realized, and the cruising problem of the electronic equipment terminal is effectively solved.

Referring to fig. 3 and 4, the detection circuit 31 includes a headset identification switch U1, the headset identification switch U1 identifies the headset type according to the comparison between the voltages of the inserted return ground contact and MIC contact of the headset and the internal voltage, and enables the MIC signal input terminal MIC _ IN according to the headset type. The bias circuit 32 comprises voltage dividing resistors R1 and R18 connected to a power supply terminal AVDD33, and a second filter circuit connected between the MIC contact and the power supply terminal, wherein a junction between the voltage dividing resistors R1 and R18 forms an output terminal MICBIAS of the bias voltage, and the second filter circuit is used for filtering interference signals. The second filter circuit is a low-pass filter circuit and mainly comprises an RC filter circuit and an LC filter circuit, the RC filter circuit comprises a filter resistor R4 and a filter capacitor C1, and the LC filter circuit comprises an inductor B1 and a filter capacitor C4. As an alternative embodiment, the earphone identification switch U1 may be an earphone grounding switch model SGM2549YN 6G. The bias voltage required for proper operation of the corresponding type of headset is provided by the bias circuit 32.

Referring to fig. 5, the signal processing circuit 30 further includes a signal amplifying circuit 33 and a first filter circuit 34, the signal amplifying circuit 33 is configured to amplify an ac signal of a received key signal input by the line control earphone, and the first filter circuit 34 performs a dc signal component filtering process on the amplified signal. The first filter circuit 34 is a high-pass filter circuit, and the signal processing circuit 30 provides a corresponding bias voltage for normal operation of the headset according to the type of the headset connected to the female jack detected by the detection circuit 31 and the type of the headset, so as to ensure correct connection between the headset and the electronic device terminal. For the line control earphone, because the amplitude of the earphone key signal is too small, in order to obtain a correct key value according to the key signal, the amplifying circuit 33 amplifies the key signal, and then the high-pass filter filters a direct current signal component in the amplified key signal to obtain an alternating current signal after the key signal is amplified.

As an alternative specific embodiment, the signal amplifying circuit 33 includes a transistor Q1, a base of the transistor Q1 is connected to the MIC signal input terminal MIC _ IN, a collector is connected to the output terminal of the bias voltage, and an emitter is grounded; a junction between the collector and the output of the bias voltage is formed as an amplified signal output OPA _ OUT. An RC filter circuit is connected between the base electrode of the triode Q1 and the MIC signal input end MIC _ IN, and can filter impurity signals IN signals input by the base electrode. A bias resistor R3 is connected between the base electrode and the collector electrode of the triode Q1, and the matched amplification factor of the amplifying circuit 33 can be determined by reasonably designing the size of the bias resistor R3 and the withstand voltage and current parameters of the triode Q1.

Referring to fig. 6, the first filter circuit 34 includes a filter resistor R9 connected to the amplified signal output terminal OPA _ OUT, and a filter capacitor C8 connected between the filter resistor R9 and ground, and a node between the filter resistor R9 and the filter capacitor C8 is formed as an output terminal OPA _ DC of a DC signal component. The first filter circuit 34 is a high-pass filter circuit. Because the collected key signals of the earphone have interference of direct current components, parameters of a filter resistor R9 and a filter capacitor C8 in the first filter circuit 34 are determined by analyzing the key signals, and the purpose of filtering the interference direct current signal components after the key signals are amplified can be achieved.

Referring to fig. 7, the controller 20 includes a first input terminal and a second input terminal respectively connected to the amplified signal output terminal OPA _ OUT and the direct current signal component output terminal OPA _ DC, and the controller 20 compares the amplified alternating current signal with the amplified direct current component signal to determine a corresponding carrier signal, and determines a corresponding key signal according to a carrier frequency of the carrier signal. The controller 20 may be a microcontroller 20 unit (MCU), a first input end and a second input end of the controller 20 respectively receive the amplified ac signal and the amplified dc signal component separated by the first filter circuit 34, the amplified ac signal and the amplified dc signal component are compared by the controller 20 to obtain an accurate amplified carrier signal, and the controller 20 determines and counts to obtain a key value corresponding to a correct carrier frequency. Because the frequency of the key signal is far more than 100KHz and far more than the hearing range (20Hz-20KHz) of human ears and the sound production range (80Hz-1000Hz) of human beings, the key signal belongs to ultrasonic waves, and therefore, the use of a microphone and an earphone by people cannot be influenced. As an optional implementation, a comparison circuit may be included between the amplified signal output end OPA _ OUT and the direct current signal component output end OPA _ DC and the first input end and the second input end of the controller 20, the amplified alternating current signal and the amplified direct current component signal are compared by the comparison circuit to determine a corresponding carrier signal, and the controller 20 determines and counts to obtain a key value corresponding to a correct carrier frequency.

The charging circuit 40 includes a switch circuit 42 connected between the female plug interface and the male plug connector 13, and the switch circuit 42 is in one-way conduction with the male plug connector 13 when the first female plug interface 11 or the second female plug interface 12 is not connected to the adapter, and takes power from the connected electronic device terminal through the male plug connector 13; the switch circuit 42 is connected with the first female plug interface 11 or the second female plug interface 12 when the adapter is connected with the female plug interface and the male plug connector 13, the two-way conduction is achieved, and electricity is obtained from the adapter through the female plug interface. The controller 20 further includes a JACK _ DET2 interface connected to the female plug interface and a JACK _ DET1 interface connected to the male plug 13, respectively, and the controller 20 can control the on-state of the switch circuit 42 in the charging circuit 40 according to the state of whether the female plug interface is connected to the adapter, so as to realize the purpose that the controller 20 and the peripheral circuit system in the charging adaptor 100 take power from the electronic device terminal or supply power from the adapter. When the interface JACK _ DET2 is not connected with the adapter, the controller 20 controls the switch circuit 42 to be conducted in a single direction, and power transmission of the electronic equipment terminal can be protected from other interference. When the JACK _ DET2 interface is connected to the adapter, the controller 20 determines the matched charging power according to the charging parameter of the adapter and the charging parameter of the electronic device terminal, and then controls the charging circuit 40 to charge the electronic device terminal through the male plug 13.

Referring to fig. 8, the switch circuit 42 includes a first fet Q2 and a second fet Q3 sharing a gate and a common source, and a third fet Q4 having a drain connected to the gates of the first fet Q2 and the second fet Q3, the drain of the first fet Q2 and the drain of the second fet Q3 are connected to the female connector and the male connector 13, respectively, and the gate and the source of the third fet Q4 are connected to ground. When the interface JACK _ DET2 is not connected with the adapter, the electronic device terminal cannot be charged through the interface JACK _ DET1, the power supply of the controller 20 and the peripheral circuit system in the charging adaptor 100 is from the power supply of the electronic device terminal of the interface JACK _ DET1, the controller 20 and the peripheral circuit system in the charging adaptor 100 process a CC pin signal of the interface JACK _ DET1 of the electronic device terminal to finish power taking, and the first field effect transistor Q2 and the second field effect transistor Q3 in the switch circuit 42 are in one-way conduction, so that the power transmission of the electronic device terminal can be protected from other interference. When the JACK _ DET2 interface is connected to the adapter, the controller 20 and the peripheral circuitry in the charging adaptor 100 process CC pin signals of the adapter and the electronic device terminal to determine the charging parameters of the adapter and the charging parameters of the electronic device terminal, the charging parameters of the adapter include, for example, a PD or a QC adapter, output power, voltage, current mode, etc., the charging parameters of the electronic device terminal include, for example, acceptable input power, electrons, current mode, etc., the mode of determining the maximum charging efficiency according to the charging parameters of the adapter and the charging parameters of the electronic device terminal is to charge the electronic device terminal through the JACK _ DET1 interface, and simultaneously the power supply of the controller 20 and the peripheral circuitry in the charging adaptor 100 is also converted from power supply from the electronic device terminal to power supply of the adapter, at this time, the first fet Q2 and the second fet Q3 in the switch circuit 42 are conducted in both directions, so as to realize the calling while charging and listening to music.

In the above embodiments of the present invention, the signal processing circuit 30 and the charging circuit 40 are designed to be connected between the female plug interface and the male plug 13, wherein the signal processing circuit 30 can detect and identify the type of the inserted earphone, and ensure the correct communication between different types of earphones and the electronic device terminals with different types of interfaces according to the identification result, thereby solving the compatibility problem between different types of earphones and different electronic device terminals; the charging circuit 40 automatically switches between a first state of getting electricity from the electronic equipment terminal and a second state of supplying power by the adapter according to the state of the female plug interface connecting adapter, and the switch circuit 42 is conducted in two directions in the second state of supplying power by the adapter, so that the function of playing music while charging is realized, and the problem that the electronic equipment terminals with different interfaces can be synchronously charged and played on the premise of a single interface is solved; the controller 20 designs a charging circuit 40 by analyzing different charging protocols according to the type of the adapter, and completes charging from the adapter to the electronic equipment terminal by matching corresponding charging parameters, so as to solve the problem that the known interface connection communication adapter of some electronic equipment terminals cannot be charged; the design of the detection circuit 31, the bias circuit 32, the amplification circuit 33 and the filter circuit in the signal processing circuit 30 realizes the correct connection between different types of earphones and different electronic equipment terminals by identifying the types of the earphones, analyzes the key signals input by the line control earphone, converts the carrier signals of keys of play pause, volume increase and volume decrease into standard HID key signals by the signal processing capability of the audio coding and decoding chip of the controller 20, and solves the problem of the adaptation between the line control earphone of the apple lightning interface and the electronic equipment terminals of different interfaces.

Use the electronic equipment terminal to be cell-phone or flat board as an example, divide into apple IOS system and android system according to the system that cell-phone or flat board supported, adopt the utility model discloses the adapter 100 that charges that above-mentioned embodiment provided for all kinds of switching products that charge known on the market at present, like apple IOS lightning conversation adapter, apple IOS lightning conversation and the adapter 100 that charges, the TYPE C adapter of android system etc. compatibility is higher. Specifically, for an apple IOS system mobile phone or tablet, the problem that the apple IOS lighting communication adapter cannot be charged and the problem that the apple IOS lighting communication and charging adapter 100 cannot support an apple drive-by-wire earphone can be solved; aiming at the android system mobile phone or the flat plate, the problems that the android system TYPE C adapter cannot listen to music and charge at the same time and the android system TYPE C adapter cannot support an apple drive-by-wire earphone can be solved.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A charging adaptor is characterized by comprising a controller, a first female plug interface and a second female plug interface which are connected with the input end of the controller, a signal processing circuit and a charging circuit which are connected between the first female plug interface and the second female plug interface and the input end of the controller, and a male plug connector which is connected with the output end of the controller, wherein the first female plug interface and the second female plug interface are used for being connected with a plug of an external device, the male plug connector is used for being connected with a socket of an electronic device terminal, the signal processing circuit comprises a detection circuit and a bias circuit, the detection circuit is used for detecting whether the first female plug interface or the second female plug interface is plugged into an earphone, and the signal processing circuit detects the state of the earphone plugged into the first female plug interface or the second female plug interface through the detection circuit, the bias circuit forms bias voltage with set magnitude, an MIC signal input end is enabled according to the bias voltage, and the controller matches the earphone with the electronic equipment terminal according to the input of the MIC signal input end; the charging circuit switches between a first state of taking electricity from the electronic equipment terminal and a second state of supplying power by the adapter according to the state of the adapter connected with the first female plug interface or the second female plug interface.

2. The charge adaptor according to claim 1, wherein the signal processing circuit further comprises a signal amplifying circuit and a first filter circuit, the signal amplifying circuit is configured to amplify an ac signal of a received key signal input by the line control earphone, and the first filter circuit is configured to perform a dc signal component filtering process on the amplified signal.

3. The charge adaptor of claim 2 wherein said signal amplification circuit comprises a transistor having a base connected to said MIC signal input terminal, a collector connected to said bias voltage output terminal, and an emitter connected to ground; a junction between the collector and the output of the bias voltage is formed as an amplified signal output.

4. A charge adaptor as claimed in claim 3 wherein said first filter circuit includes a filter resistor connected to said amplified signal output terminal and a filter capacitor connected between said filter resistor and ground, the junction between said filter resistor and said filter capacitor being formed as a dc signal component output terminal.

5. The charge adaptor of claim 4 wherein said controller includes first and second input terminals connected to said amplified signal output terminal and said DC signal component output terminal, respectively, said controller comparing the amplified AC signal and DC component signal to determine a corresponding carrier signal and determining a corresponding key signal based on the carrier frequency of said carrier signal.

6. The charge adaptor of claim 1 wherein said detection circuit comprises a headset identification switch, said headset identification switch identifying said headset type based on a comparison of the voltage of the inserted return ground contact and MIC contact of said headset with an internal voltage, said MIC signal input being enabled based on said headset type.

7. The charge adaptor of claim 6 wherein the bias circuit comprises a voltage divider resistor connected to a power supply terminal, the other end of the voltage divider resistor forming an output for the bias voltage, and a second filter circuit connected between the MIC contact and the power supply terminal, the second filter circuit for filtering out interfering signals.

8. The charging adaptor of claim 1, wherein the charging circuit comprises a switch circuit connected between the first female plug interface or the second female plug interface and a male plug connector, the switch circuit is in one-way conduction with the male plug connector when the first female plug interface or the second female plug interface is not connected with the adaptor, and power is taken from the connected electronic equipment terminal through the male plug connector; the switch circuit is connected with the first female plug interface or the second female plug interface when the adapter is connected with the female plug interface and the male plug connector respectively, and the switch circuit is conducted in two directions and gets electricity from the adapter through the female plug interface.

9. The charge adaptor as claimed in claim 8, wherein the switching circuit comprises a first field effect transistor and a second field effect transistor sharing a gate and a common source, and a third field effect transistor having a drain connected to the gates of the first field effect transistor and the second field effect transistor, the drain of the first field effect transistor and the drain of the second field effect transistor are connected to the female plug connector and the male plug connector, respectively, and the gate and the source of the third field effect transistor are connected to ground.

10. The charging adaptor of claim 8, wherein the controller determines a matched charging power according to the charging parameters of the adapter and the charging parameters of the electronic device terminal, and controls the charging circuit to charge the electronic device terminal through the male plug according to the matched charging power.

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