CN111314817A - Switching control circuit, terminal equipment and switching control method - Google Patents

Abstract

The application discloses a switching control circuit, terminal equipment and a switching control method, which relate to the technical field of electronics and are applied to the terminal equipment comprising a first power supply end, a second power supply end and an audio connector, wherein the audio connector comprises a first power supply pin and a second power supply pin, and the switching control circuit comprises a detection module, a first switch module and a second switch module; the detection module is connected with the first power supply pin or the second power supply pin and is used for detecting whether the types of the audio playing equipment and the audio connector are matched or not when the audio playing equipment is connected with the audio connector; the first power supply pin is connected with the first power supply end through the first switch module and connected with the second power supply end through the second switch module; the second power supply pin is connected with the second power supply end through the first switch module and connected with the first power supply end through the second switch module; the first switch module and the second switch module are respectively connected with the detection module, and the first switch module is used for conducting when the types are matched; and the second switch module is used for conducting when the types are not matched. Thereby being compatible with audio playing devices of different standards.

Description

Switching control circuit, terminal equipment and switching control method

technical field

The present application relates to the field of electronic technology, and more particularly, to a switching control circuit, a terminal device and a switching control method.

Background technique

There are two main standards for headsets on the market, namely the OMTP standard of the Open Mobile Terminal Platform (OMTP), also known as the national standard or European standard and the Cellular Telecommunications Industry Association (CTIA) standard. CTIA standard, also known as international standard or American standard.

Due to the different internal connection methods of earphones of different standards, currently the terminal generally supports only one standard, resulting in incompatibility problems such as sound distortion and crosstalk when the earphone jack of the terminal does not match the earphone type, and may even cause the microphone to be unavailable. .

SUMMARY OF THE INVENTION

The embodiments of the present application propose a switching control circuit, a terminal device, and a switching control method, which can be compatible with audio playback devices of different standards at the same time.

In a first aspect, an embodiment of the present application provides a switching control circuit, which is applied to a terminal device. The terminal device includes a first power supply terminal, a second power supply terminal, and an audio connector, and the audio connector includes a first power supply lead. The switch control circuit includes: a detection module, a first switch module and a second switch module; the detection module is connected to the first power supply pin or the second power supply pin , used to detect whether the audio connector matches the type of the audio playback device when the audio playback device is connected to the audio connector; the first power pin is connected to the first switch module through the first switch module. The first power supply terminal is connected to the second power supply terminal through the second switch module; the second power supply pin is connected to the second power supply terminal through the first switch module, and is connected through the second switch module the first power supply terminal; the first switch module, connected to the detection module, is used for connecting the first power supply pin to the The first power supply terminal is turned on, the second power supply pin is connected to the second power supply terminal, and when the audio connector does not match the type of the audio playback device, the first power supply pin is turned on. The power supply pin is disconnected from the first power supply terminal, and the second power supply pin is disconnected from the second power supply terminal; the second switch module is connected with the detection module and is used for When the audio connector does not match the type of the audio playback device, the first power supply pin is connected to the second power supply terminal, and the second power supply pin is connected to the first power supply terminal. turn on, and when the audio connector matches the type of the audio playback device, disconnect the first power supply pin from the second power supply terminal, and connect the second power supply pin with all The first power supply terminal is disconnected.

In a second aspect, an embodiment of the present application provides a terminal device, including: a casing; an audio connector disposed on the casing; a first power supply terminal, a second power supply terminal, and the like The switching control circuit described in the first aspect above.

In a third aspect, an embodiment of the present application provides a switching control method, which is applied to a terminal device, where the terminal device includes a first power supply terminal, a second power supply terminal, and an audio connector, and the audio connector includes a first power supply lead pin and a second power pin, the method includes: when the audio connector is connected with the audio playback device, detecting whether the audio connector matches the type of the audio playback device; when the audio connector is connected to the audio playback device When the types of the audio playback devices are matched, the first power supply pin is connected to the first power supply terminal, the second power supply pin is connected to the second power supply terminal, and the first power supply pin is connected to the second power supply terminal. The types of the power supply terminal and the second power supply terminal are opposite; when the audio connector does not match the type of the audio playback device, the first power supply pin is connected to the second power supply terminal, and all the The second power supply pin is connected to the first power supply terminal.

A switching control circuit, a terminal device, and a switching control method provided by the embodiments of the present application are applied to a terminal device including first and second power supply terminals and an audio connector, and the audio connector includes first and second power pins, The switching control circuit includes a detection module, first and second switch modules, wherein the first power supply pin is connected to the first power supply terminal through the first switch module, and is connected to the second power supply terminal through the second switch module; The first switch module is connected to the second power supply terminal, and the second switch module is connected to the first power supply terminal; the detection module is connected to the first or second power supply pins, and is used to detect the two when the audio playback device is connected to the audio connector. Whether the types match, the first and second switch modules are respectively connected to the detection module, and the first switch module is turned on when the types match, and the second switch module is turned on when the types do not match. Therefore, when the audio playback device is connected to the audio connector, it can automatically detect whether the types of the audio playback device and the audio connector match, and when the types match, the first power supply pin is connected to the first power supply terminal, and the second power supply The pin is connected to the second power supply terminal. When the type does not match, the first power supply pin is connected to the second power supply terminal, and the second power supply pin is connected to the first power supply terminal, so that the two power supply pins can be connected. The level is changed to achieve compatibility with audio playback devices of different standards.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 shows a schematic diagram of a switching control circuit provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of the plug-in connection of an audio playback device and an audio connector provided by an exemplary embodiment of the present application;

FIG. 3 shows a schematic diagram of a switching control circuit provided by another embodiment of the present application;

FIG. 4 shows a schematic diagram of the connection of a switching control circuit provided by an exemplary embodiment of the present application;

FIG. 5 shows a schematic connection diagram of a switching control circuit provided by another exemplary embodiment of the present application;

FIG. 6 shows a schematic diagram of the working principle of a switching control circuit provided by an exemplary embodiment of the present application;

FIG. 7 shows a schematic diagram of the working principle of a switching control circuit provided by another exemplary embodiment of the present application;

FIG. 8 shows a schematic diagram of a terminal device provided by an embodiment of the present application;

FIG. 9 shows a schematic flowchart of a handover control method provided by an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application.

Before explaining the embodiments of the present application in detail, the concepts involved in the embodiments of the present application are first explained as follows:

1. Headphone holder: the socket of the headphone.

2. American Standard: Corresponding to the CTIA standard, also known as the international standard, the 3.5mm earphone pin sequence of the American Standard earphone is (from the outside to the inside, among which, the side that first enters the earphone holder when the earphone is inserted into the earphone holder is the outside): Left channel-right channel-ground-microphone (L/R/G/M).

3. European standard earphones: corresponding to the OMTP standard, also known as the national standard, the pin order of the 3.5mm earphones of the European standard earphones is (from outside to inside): left channel-right channel-microphone-ground (L/R/M /G).

For cost-saving reasons, the current terminal with a 3.5mm headphone jack only supports American standard earphones or European standard earphones at the beginning of the design. Incompatibility issues such as crosstalk may even render the microphone unavailable. For example, when a terminal designed to only support the recognition of American standard earphones is inserted into European standard earphones, the terminal may have no response or abnormal accompaniment sound, but the human voice is basically eliminated, and the sound is ethereal.

Based on the above problems, embodiments of the present application provide a switching control circuit, a terminal, and a switching control method. The following will be described in detail through specific embodiments.

Please refer to FIG. 1 . FIG. 1 shows a schematic diagram of a switching control circuit provided by an embodiment of the present application. As shown in FIG. 1 , the switching control circuit 100 includes: a detection module 110 , a first switch module 120 and a second switch module 130.

Wherein, the switching control circuit 100 is applied to a terminal device, and the terminal device can be a mobile phone, an MP3 player (Moving Picture Experts Group Audio Layer III, the standard audio layer 3 of the moving picture expert compression standard), MP4 (Moving Picture Experts Group Audio Layer IV, dynamic Video Expert Compression Standard Audio Layer 4) Player, Laptop, Desktop, Head Mounted Device or any other terminal. In order to introduce the functional principle that the switching control circuit 100 can implement, the terminal equipment environment connected to the switching control circuit 100 is introduced first. The terminal equipment includes an audio connector 210 , a first power supply terminal 220 and a second power supply terminal 230 .

The types of the first power supply terminal 220 and the second power supply terminal 230 are different. For example, the potentials may be different, that is, one power supply terminal is at a high potential, and the other power supply terminal is at a low potential, wherein the power supply terminal of the low potential can be the ground terminal and the negative terminal of the power supply, and the power supply terminal of the high potential can be the positive terminal of the power supply, It can also be other power supply terminals whose potential is higher than the low potential, which is not limited here.

In one embodiment, the first power supply terminal 220 is at a high potential, and the second power supply terminal 230 is at a low potential. At this time, current can flow out from the first power supply terminal 220 and flow in from the second power supply terminal 230, for example, the first power supply terminal 230 The power supply terminal 220 may be the positive terminal of the power supply, and the second power supply terminal 230 may be the negative terminal or the ground terminal of the power supply. In another embodiment, the first power supply terminal 220 may be at a low potential, and the second power supply terminal 230 may be at a high potential. At this time, current may flow out from the second power supply terminal 230 and flow in from the first power supply terminal 220 .

The audio connector 210 includes a first power supply pin 211 and a second power supply pin 212 . The first power supply pin 211 and the second power supply pin 212 are used to connect the audio playback device when the audio connector 210 is connected to the audio playback device.

In an example, the audio connector 210 is a 3.5mm headphone jack, and the audio playback device is a headphone with a 3.5mm headphone jack. In this case, one of the first power supply pin 211 and the second power supply pin 212 is used to connect audio The microphone (MIC) pin of the playback device, and the other is used to connect the ground (GND) pin of the audio playback device. When the audio playback device is connected to the audio connector 210, in order to make the audio playback device work normally, the GND pin of the audio playback device should be connected to the negative terminal of the power supply or the ground, and the MIC pin of the audio playback device should be connected to the positive terminal of the power supply.

In this embodiment, if the first power supply pin 211 is connected to the MIC pin of the audio playback device, and the second power supply pin 212 is connected to the GND pin of the audio playback device, the first power supply pin 211 should be connected to the high-potential power supply terminal Connection, the second power supply pin 212 should be connected to the low-potential power supply terminal, so that the current flows into the MIC pin of the audio playback device through the first power supply pin 211, and then flows out from the GND pin of the audio playback device to the second power supply pin. feet 212.

Conversely, if the first power supply pin 211 is connected to the GND pin of the audio playback device, and the second power supply pin 212 is connected to the MIC pin of the audio playback device, the first power supply pin 211 should be connected to the low-potential power supply terminal, and the first power supply pin 211 should be connected to the low-potential power supply terminal. The second power supply pin 212 should be connected to the high-potential power supply terminal, so that the current flows into the MIC pin of the audio playback device through the second power supply pin 212 , and then flows out from the GND pin of the audio playback device to the first power supply pin 212 .

Therefore, the switching control circuit provided in the embodiment of the present application can realize the above connection when different audio playback devices are connected to the audio connector 210 , thereby achieving compatibility with different audio playback devices.

The detection module 110 is connected to the first power supply pin 211 or the second power supply pin 212 for detecting whether the audio connector 210 matches the audio playback device when the audio playback device is connected to the audio connector 210 .

The following is the description of the detection principle. The audio connector is a 3.5mm headphone holder and the audio playback device is a 3.5mm headphone. , The 3.5mm headphone holder includes four pins, which are the left channel positive polarity (LP) pin, the right channel negative polarity (RN) pin, the GND pin, and the MIC pin. Among them, the potential of the MIC pin is higher than the GND pin.

Since the pins of American standard earphones are L, R, GND, MIC from outside to inside, and the pins of European standard earphones are L, R, MIC, GND from outside to inside, so the pins of the headphone holder suitable for American standard earphones are set by The inside and outside should be the LP pin, the RN pin, the GND pin, the MIC pin, and the pins of the earphone holder that adapt to the European standard earphones should be the LP pin, RN pin, MIC pin, GND pin. It can be seen that the order between the MIC pin and the GND pin of the European standard earphone and the American standard earphone is reversed, that is, the third and fourth pins of the European standard earphone from the outside to the inside are the MIC pin and the GND pin respectively, and the American standard earphone is from the outside to the inside. The 3rd and 4th pins are the GND pin and the MIC pin respectively.

Among them, the potential of the MIC pin is higher than the potential of the GND pin, then the voltage of the detected MIC pin is higher than the GND pin, and the voltage range corresponding to the MIC pin can be recorded as high level, and the voltage range corresponding to the GND pin can be recorded as low level . It should be noted that the voltage ranges corresponding to the high level and the low level can be customized, and the standard voltage range of the MIC pin and the GND pin can also be used. In this embodiment, the voltage corresponding to the high level is higher than the low level. In addition to the voltage corresponding to the level, this embodiment does not make other limitations on this.

Since the order of the MIC and GND pins of different standard earphones is different, the positions of the first power supply pin 120 and the second power supply pin 130 of the audio connector 210 remain unchanged. When the detection module 110 is only connected to one of the first power supply pin 120 and the second power supply pin 130 of the audio connector 210, when headphones of different standards are inserted into the audio connector 210, the detection module 110 is connected to the same power supply pin. The circuit parameters detected at different places are different, so the type of the connected audio playback device can be determined according to the circuit parameters detected by the detection module 110, such as the standard of the inserted earphone, and the conduction of the first switch module 120 and the second switch module 130 can be controlled. status to achieve compatibility with different standard headsets. The circuit parameters may be parameters such as voltage and current, that is, the detection module 110 may be used to detect voltage, current or other circuit parameters, which is not limited in this embodiment.

Please refer to FIG. 2 , which shows a schematic diagram of the insertion and connection of an audio playback device and an audio connector provided by an exemplary embodiment of the present application. In FIG. 2 , the pins of the audio connector 210 from the inside to the outside are the LP pin, the RN pin, the second power supply pin 212 and the first power supply pin 211 in sequence. At this time, if the audio playback device 30 is an American standard earphone, when it is inserted into the audio connector 210 , the MIC pin is connected to the first power pin 211 , and the GND pin is connected to the second power pin 212 . It should be noted that, the audio playback device 30 in FIG. 2 only shows a schematic structure of the part connected with the audio connector 210 , and is only used to illustrate the connection relationship with the audio connector 210 .

As an embodiment, the first power pin 211 of the audio connector 210 can be used to connect the fourth pin of the audio playback device from outside to inside, that is, the first pin of the audio connector 210 from outside to inside, the second power The pin 212 can be used to connect the third pin from the outside to the inside of the audio playback device, that is, the second pin from the outside to the inside of the audio connector 210 , as shown in FIG. 2 . As another embodiment, the first power pin 211 of the audio connector 210 can be used to connect the third pin, and the second power pin 212 can be used to connect the fourth pin. This embodiment does not limit this.

For convenience of description below, the positions of the first power supply pin 211 and the second power supply pin 212 shown in FIG. 2 are used as an example for description.

The first power pin 211 of the audio connector 210 is connected to the first power supply terminal 220 through the first switch module 120 , and is connected to the second power supply terminal 230 through the second switch module 130 . The second power pin 212 is connected to the second power supply terminal 230 through the first switch module 120 , and is connected to the first power supply terminal 220 through the second switch module 130 .

The first switch module 120 is connected to the detection module 110, and is used to conduct the first power supply pin 211 with the first power supply terminal 220 when the audio connector 210 matches the type of the audio playback device, and connect the second power supply pin 212 is connected to the second power supply terminal 230, and when the audio connector 210 does not match the type of the audio playback device, the first power supply pin 211 is disconnected from the first power supply terminal 220, and the second power supply pin 212 Disconnect from the second power supply terminal 230 .

In one embodiment, the first switch module 120 may include at least two switch elements, and the two switch elements are connected to the detection module 110 , and the at least one switch element is connected to the first power pin 211 and the first power supply terminal 220 and controlled by the detection module 110, and at least one switch element is connected between the second power pin 212 and the second power supply terminal 230, and is controlled by the detection module 110, so that at least two switches of the first switch module 120 The switching elements are turned on at the same time when matched, and turned off at the same time when they are not matched. The switching element may be a triode, a field effect transistor or other element, and may also be other switching devices having at least three terminals, as long as the aforementioned conduction conditions are satisfied, which is not limited in this embodiment.

The second switch module 130 is connected to the detection module 110, and is used to conduct the first power supply pin 211 and the second power supply terminal 230 when the type of the audio connector 210 does not match the audio playback device, and conduct the second power supply The pin 212 is connected to the first power supply terminal 220, and when the audio connector 210 matches the type of the audio playback device, the first power supply pin 211 is disconnected from the second power supply terminal 230, and the second power supply pin 212 is disconnected. Disconnected from the first power supply terminal 220 .

In some embodiments, since the audio playback device has different types of pins connected to the first power supply pin 211 and the second power supply pin 212, the levels corresponding to different types are different. For example, the MIC pin corresponds to a high level, and the GND pin corresponds to a high level. Low level, therefore, by detecting the voltage of the first power supply pin 211, the type of the pin of the audio playback device connected to the first power supply pin 211 can be determined, and it can also be determined whether the type of the audio connector 210 and the audio playback device is match.

In some embodiments, the detection module 110 can be used to detect the target voltage of the target power supply pin in the first power supply pin 211 or the second power supply pin 212 of the audio connector 210, where the target voltage corresponds to the voltage of the target power supply pin When the range does not match, it can be determined that the audio connector 210 does not match the type of the audio playback device, and when the target voltage matches the voltage range corresponding to the target power supply pin, it can be determined that the audio connector 210 matches the type of the audio playback device .

Further, as an implementation manner, the detection module 110 can process the detected voltage to obtain a control signal, and output the control signal to the first switch module 120 and the second switch module 130 to control the first switch module 120 and the third switch The on state (ie, on or off) of the module 130 . At this time, the detection module 110 may include a comparator for outputting a corresponding level signal according to the detected voltage. For example, one input terminal may be connected to a reference voltage source, and the other input terminal may be connected to the target power supply pin, so as to compare the The target voltage of the target power supply pin and the reference voltage of the reference voltage source output a high level (1) when the target voltage is higher than the reference voltage, and output a low level (0) when the target voltage is not higher than the reference voltage. In an example, the comparator may be a MAX913 comparator, and other devices capable of outputting level signals according to voltage may also be used, which is not limited in this embodiment.

As another embodiment, the detection module 110 may not process the detected voltage, that is, directly output the voltage signal without converting it into a level signal, so that the first switch module 120 and the second switch module 130 can The detected target voltage switches the on state. (However, for the convenience and uniformity of expression, the high level will be used to refer to the higher voltage range, and the low level will refer to the lower voltage range, which means the level of the voltage, not the level signal.) , the turn-on voltages of the first switch module 120 and the second switch module 130 may be different. For example, the first switch module 120 may be turned on when the target voltage is at a high level and turned off when the target voltage is at a low level, and the second switch module 130 may be It is turned on when it is low and disconnected when it is high. At this time, the first switch module 120 and the second switch module 130 may be composed of triodes, field effect transistors, etc., so that the conduction state can be switched according to the target voltage without an additional control circuit.

In one example, the detection module 110 may include a voltage detection pin, which may be directly connected to the first power supply pin 211 or the second power supply pin 212, or may be connected to the first power supply pin 211 or the second power supply pin for indicating the first power supply pin 211 or the second power supply pin. The level port of the pin 212 is connected to detect the target voltage of the target power supply pin and output to the first switch module 120 and the second switch module 130 . The target power supply pin is the first power supply pin 211 or the second power supply pin 212 .

The first switch module 120 is configured to conduct the first power supply pin 211 and the first power supply terminal 220 when the target voltage of the target power supply pin is in the first voltage range, and connect the second power supply pin 212 to the second power supply The terminal 230 is turned on, and when the target voltage of the target power supply pin is in the second voltage range, the first power supply pin 211 is disconnected from the first power supply terminal 220, and the second power supply pin 212 is connected to the second power supply terminal. 230 Disconnect.

Wherein, in one embodiment, the potential of the first power supply terminal 220 is higher than that of the second power supply terminal 230 . At this time, the first voltage range corresponds to a high level, and the second voltage range corresponds to a low level. In another embodiment, the potential of the first power supply terminal 220 is lower than that of the second power supply terminal 230 . At this time, the first voltage range corresponds to a low level, and the second voltage range corresponds to a high level.

The second switch module 130 is configured to disconnect the first power supply pin 211 from the second power supply terminal 230 and connect the second power supply pin 212 to the first power supply terminal when the voltage of the target power supply pin is in the first voltage range. The terminal 220 is disconnected, and when the voltage of the target power supply pin is in the second voltage range, the first power supply pin 211 is connected to the second power supply terminal 230, and the second power supply pin 212 is connected to the first power supply terminal 220. on.

In some embodiments, the detection module 110 can be connected to the first power pin 211, and when it is detected that the voltage of the first power pin 211 corresponds to a high level, it can be determined that the audio connector 210 matches the type of the audio playback device, When it is detected that the voltage of the first power pin 211 corresponds to a low level, it can be determined that the audio connector 210 does not match the type of the audio playback device, that is, the terminal device can be adapted to American standard headphones by default. In other embodiments, if the detection module 110 is connected to the first power pin 211, when it is detected that the voltage of the first power pin 211 corresponds to a low level, it can be determined that the type matches, otherwise it does not match, that is, this When the terminal device can be adapted to the European standard headset by default. That is, the present embodiment does not limit the conditions for determining whether the types of the audio connector 210 and the audio playback device match.

In other embodiments, the detection module 110 can be connected to the second power pin 212 , and the method of determining whether the audio connector 210 matches the type of the audio playback device is the same as when the detection module 110 is connected to the first power pin 211 similar, and will not be repeated here.

In one embodiment, taking the audio playback device as an earphone as an example, the first power supply terminal 220 may correspond to the positive terminal of the power supply, the second power supply terminal 230 may be the ground terminal, and the detection module 110 is connected to the first power supply pin 211 . When the earphone is inserted into the audio connector 210, the detection module 110 detects the target voltage of the first power supply pin 211. If the target voltage corresponds to a high level, the MIC pin of the audio playback device is connected to the first power supply pin 211, that is, the audio playback device is connected to the first power supply pin 211. If the device is a European standard earphone, the first switch module 120 is turned on, so that the first power supply pin 211 connected to the MIC pin of the European standard earphone is connected to the first power supply terminal 220, and the GND pin of the European standard earphone is connected to The second power pin 212 is connected to the second power supply terminal 230 , that is, grounded, so that the European standard earphone can be used normally.

In addition, if the target voltage corresponds to a low level, and the GND pin of the audio playback device is connected to the first power pin 211, that is, the audio playback device is an American standard earphone, the second switch module 130 is turned on so as to connect with the American standard earphone. The first power pin 211 connected to the GND pin of the earphone is connected to the second power supply terminal 230, that is, grounded, and the second power supply pin 212 connected to the MIC pin of the American standard earphone is connected to the first power supply terminal 220, so that the American standard Headphones can be used normally. This achieves compatibility with American standard and European standard earphones.

In the switching control circuit 100 provided in this embodiment, when the audio playback device is connected to the audio connector 210, the detection module 110 automatically detects whether the types of the audio playback device and the audio connector 210 match, and when the types match, the first power supply The pin 211 is connected to the first power supply terminal 220 through the first switch module 120, and the second power supply pin 212 is connected to the second power supply terminal 230 through the first switch module 120. When the types do not match, the first power supply pin 211 is connected to the second power supply terminal 230 through the second switch module 130, and the second power supply pin 212 is connected to the first power supply terminal 220 through the second switch module 130, so that the first power supply pin 211, the second power supply The level of the pin 212 can be changed according to the type of audio playback device, so as to achieve compatibility with audio playback devices of different standards.

Please refer to FIG. 3 . FIG. 3 shows a schematic diagram of a switching control circuit provided by another embodiment of the present application. As shown in FIG. 3 , the switching control circuit 100 includes a detection module 110 , a first switch module 120 and a second switch module 130.

The first switch module 120 further includes: a first switch unit 121 and a second switch unit 122 . The first switch unit 121 is connected to the detection module 110 and the second switch unit 122 , and is used for controlling the conduction state of the second switch unit 122 according to the detection result detected by the detection module 110 . In some embodiments, the first switch unit 121 and the second switch unit 122 may be devices that can be used as switches, such as triodes, field effect transistors, etc., which are not limited in this embodiment.

The second switch unit 122 is connected between the first power supply pin 211 and the first power supply terminal 220 , and the second switch unit 122 is further connected between the second power supply pin 212 and the second power supply terminal 230 . The first switch unit 121 and the second switch unit 122 are used to conduct when the type of the audio connector 210 matches the audio playback device, and disconnect when they do not match, so that when the type is matched, the first switch module 120 will be connected. The first power supply pin 211 and the first power supply terminal 220, and between the second power supply pin 212 and the second power supply terminal 230 are connected, so that when the types are matched, the first power supply pin 211 connected through the first switch module 120 A power supply pin 211 is disconnected from the first power supply terminal 220 , and the second power supply pin 212 is disconnected from the second power supply terminal 230 .

In addition, in some embodiments, the second switch module 130 may include a third switch unit 131, the third switch unit 131 is connected to the detection module 110, and the third switch unit 131 is connected to the first power pin 211 and the second power supply Between the terminals 230 , the third switch unit 131 is further connected between the second power pin 212 and the first power supply terminal 220 . Since the connection relationship of the third switch unit 131 is the same as that of the second switch module 130 , its working principle can also be referred to the second switch module 130 , which will not be repeated here.

In one embodiment, the first switch unit 121 , the second switch unit 122 , and the third switch unit 131 may all be composed of insulated gate field effect transistors, which are also called metal-oxide-semiconductor type field effect transistors. (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), MOS tube. There are two types of MOS tubes, namely N-channel type MOS tubes (ie NMOS tubes) and P-channel type MOS tubes (ie PMOS tubes). Since the turn-on voltages of different types of MOS transistors are different, the first switch unit 121 can be turned on or off according to the voltage detected by the detection module 110, thereby controlling the turn-on or turn-off of the second switch unit 122 to control the first power supply The conduction state between the pin 211 and the first power supply terminal 220 and the conduction state between the second power supply pin 212 and the second power supply terminal 230 .

Among them, the MOS tube is a voltage control device, the gate current is extremely small, the voltage generated when the MOS tube is saturated and turned on is reduced, the power dissipation is small, and the efficiency is higher. High current and low cost, so using MOS tube to realize the switching control circuit 100 to achieve compatibility with audio playback equipment of different standards, compared with other solutions using integrated switch chips, it can greatly reduce cost and power consumption , to improve the response speed, so that the response speed reaches the microsecond level. And since the MOS tube can be turned on or off according to the voltage, it is also unnecessary to add a control circuit to control the conduction state of the MOS tube.

As an implementation manner, the first switch unit 121 may be an NMOS transistor, and the second switch unit 122 and the third switch unit 131 may be a PMOS transistor. In an example, the connection relationship of the three switch units can be referred to FIG. 4 , which shows a schematic diagram of a switching control circuit provided by an exemplary embodiment of the present application. As shown in FIG. 4 , the first switch unit 121 is a MOS transistor. Q1 is an NMOS transistor, the second switch unit 122 is a MOS transistor Q2 and a PMOS transistor, and the third switch unit 131 is a MOS transistor Q3 and a PMOS transistor. And specifically, the gates of Q1 and Q3 are connected to the voltage detection pin 111, the source of Q1 is grounded, the drain of Q1 is connected to the gate of Q2, the source of Q2 is connected to the port PORT1, and the drain of Q2 is connected to the output. The port OUT is connected, the source of Q3 is connected to the port PORT2, and the drain of Q3 is connected to the output port OUT. In addition, the resistors R1 , R2 , and R3 may be resistors, magnetic beads with resistance characteristics, or other elements with resistance characteristics, etc., which are not limited in this embodiment. In addition, the first switch unit 121 is also grounded through the capacitor C1, and the capacitor C1 can be used to pass the alternating current and cut off the direct current.

For the sake of simplicity, FIG. 4 uses the output port OUT to refer to the circuit for connecting the first power supply pin 211 and the second power supply pin 212, and uses the port PORT1 to refer to the circuit for connecting the first power supply terminal 220, The circuit for connecting the second power supply pin 212 to the second power supply terminal 230 is used to refer to the circuit for connecting the first power supply pin 211 to the second power supply terminal 230 and the second power supply pin 212 to the first power supply terminal by using the port PORT2. 220 way to connect the circuit.

Taking the input signal after the voltage detection pin 111 detects the target power supply pin can be high level or low level as an example, in Figure 4, when the voltage detection pin 111 input is 1 (high level), Q1, Q2 is turned on, Q3 is turned off, at this time, the output port OUT is connected to the port PORT1, so that the first power supply pin 211 and the first power supply terminal 220 are connected, and the second power supply pin 212 and the second power supply terminal 230 are connected. That is, the first power supply pin 211 is connected to the positive terminal of the power supply, and the second power supply pin 212 is grounded; when the input of the voltage detection pin 111 is 0 (low level), Q1 and Q2 are turned off, and Q3 is turned on. At this time, the output port OUT is connected to the port PORT2, so that the first power supply pin 211 is connected to the second power supply terminal 230, and the second power supply pin 212 is connected to the first power supply terminal 220, that is, the first power supply pin 211 is grounded, and the second power supply The pin 212 is connected to the positive terminal of the power supply. Therefore, the switching control circuit 100 can control the level of the first power supply pin 211 and the second power supply pin 212 by detecting the voltage of the target power supply pin, so that different level combinations of the two power supply pins can support different levels Standard audio playback device.

As another implementation manner, the first switch unit 121 may be a PMOS transistor, and the second switch unit 122 and the third switch unit 131 may be NMOS transistors. In an example, please refer to FIG. 5 for the connection relationship of the three switch units, which shows a schematic diagram of another switching control circuit provided by an exemplary embodiment. In FIG. 5, the output ports OUT, PORT1, PORT2 and consistent with Figure 4. As shown in FIG. 5 , the first switch unit 121 is a MOS transistor Q1 and the type is a PMOS transistor, the second switch unit 122 is a MOS transistor Q2 and the type is an NMOS transistor, and the third switch unit 131 is a MOS transistor Q3 and the type is an NMOS transistor. . And specifically, the gates of Q1 and Q3 are connected to the voltage detection pin 111, the drain of Q1 is connected to VDD, the source of Q1 is connected to the gate of Q2, and the source of Q2 is connected to the port PORT1 (specifically, the The source is connected to the first power supply terminal 220 and the second power supply terminal 230 respectively through the port PORT1), and the drain of Q2 is connected to the output port OUT (specifically, the drain of Q2 is connected to the first power supply pin 211 through the output port OUT respectively) , the second power supply pin 212 is connected), the source of Q3 is connected to the port PORT2 (specifically, the source of Q3 is connected to the first power supply terminal 220 and the second power supply terminal 230 through the port PORT2 respectively), and the drain of Q3 is connected to the output The port OUT is connected (specifically, the drain of Q3 is connected to the first power supply pin 211 and the second power supply pin 212 respectively through the output port OUT).

Taking the input signal after the voltage detection pin 111 detects the target power supply pin can be high level or low level as an example, in Figure 5, when the voltage detection pin input is 0 (low level), Q1, Q2 lead On, Q3 is off, at this time, the output port OUT is connected to the port PORT1, so that the first power supply pin 211 is connected to the positive end of the power supply, and the second power supply pin 212 is grounded; when the voltage detection pin 111 is input as 1 (high level) At this time, Q1 and Q2 are turned off and Q3 is turned on. At this time, the output port OUT is connected to the port PORT2, so that the first power supply pin 211 is grounded, and the second power supply pin 212 is connected to the positive terminal of the power supply. Therefore, the switching control circuit 100 can control the level of the first power supply pin 211 and the second power supply pin 212 by detecting the voltage of the target power supply pin, so that different level combinations of the two power supply pins can support different levels Standard audio playback device.

In some embodiments, the positions of the first power supply pin 211 and the second power supply pin 212 are shown in FIG. 2 , and the first power supply terminal 220 is the positive terminal of the power supply and the second power supply terminal 230 is the ground terminal. At this time, when the output port OUT is connected to the port PORT1, the first power supply pin 211 is connected to the first power supply terminal 220, that is, the positive terminal of the power supply, which can be used to connect the MIC pin, and the second power supply pin 212 is connected to the second power supply Terminal 230, that is, ground, can be used to connect the GND pin, which can support the normal operation of American standard headphones; when the output port OUT is connected to the port PORT2, the first power supply pin 211 is connected to the second power supply terminal 230, that is, grounding, available For connecting to the GND pin, the second power pin 212 is connected to the first power supply terminal 220 , that is, the positive terminal of the power supply, which can be used to connect the MIC pin, which can support the normal operation of the European standard earphones. Thus, compatibility with different standard earphones can be realized.

In some embodiments, according to the different target power pins detected by the voltage detection pin 111, the corresponding voltage range of the audio connector 210 and the audio playback device may be different when the type is matched, that is, the target power pin can be Corresponding to the first voltage range and the second voltage range, if the target power supply pins are different, the first voltage range and the second voltage range may also be different. Therefore, according to the difference of the target power supply pin, the voltage level input from the voltage detection pin 111 to the first switch unit 121 and the third switch unit 131 may be different, so the target power supply pin can correspond to the combination of MOS transistors, and the target power supply pin At different times, different MOS transistor combinations may be used, such as the MOS transistor combinations shown in FIGS. 4 and 5 or other MOS transistor combinations.

In one embodiment, please refer to FIG. 6 , which shows a schematic diagram of the working principle of the switching control circuit provided by an exemplary embodiment of the present application. Between the audio connector 210 and the first power supply terminal 220 and the second power supply terminal 230, a symmetrical switch circuit as shown in FIG. 4 can be arranged, the voltage detection pin 111 is connected to the first power supply pin 211, and the first power supply pin 211 The voltage range corresponds to a high level, and the second voltage range corresponds to a low level. At this time, a combination of MOS transistors as shown in FIG. 4 can be used (Q1 is an NMOS transistor and Q2 and Q3 are PMOS transistors). Then when the European standard earphone is inserted into the audio connector 210, the first power pin 211 is connected to the MIC pin of the European standard earphone, and the second power pin 212 is connected to the GND pin of the European standard earphone, then the voltage detection pin 111 detects the The voltage of the first power supply pin 211 is in the first voltage range. At this time, Q1, Q1', Q2, and Q2' are turned on, Q3 and Q3' are turned off, and the output port OUT is connected to the port PORT1, so that the first power supply pin 211 Connected to the positive terminal of the power supply, for example, connected to the bias voltage VBIAS through the pull-up resistor Rup, the second power supply pin 212 is grounded, so as to support the normal operation of the European standard earphone.

When the American standard earphone is inserted into the audio connector 210, the first power supply pin 211 is connected to the GND pin of the American standard earphone, and the second power supply pin 212 is connected to the MIC pin of the American standard earphone, then the voltage detection pin 111 detects the first The voltage of a power supply pin 211 is in the second voltage range. At this time, Q1, Q1', Q2, and Q2' are turned off, Q3 and Q3' are turned on, and the output port OUT is connected to the port PORT2, so that the first power supply pin 211 is grounded , the second power pin 212 is connected to the positive terminal of the power supply, so as to support the normal operation of the American standard earphones.

In another embodiment, please refer to FIG. 7 , which shows a schematic diagram of the working principle of the switching control circuit provided by an exemplary embodiment of the present application. A symmetrical circuit as shown in FIG. 5 can be arranged between the audio connector 210 and the first power supply terminal 220 and the second power supply terminal 230 , the voltage detection pin 111 is connected to the second power supply pin 212 , and the first voltage range Corresponding to the low level and the second voltage range corresponding to the high level, the MOS transistor combination shown in FIG. 5 can be used at this time (Q1 is a PMOS transistor and Q2 and Q3 are NMOS transistors). Then when the American standard earphone is inserted into the audio connector 210, the first power supply pin 211 is connected to the MIC pin of the American standard earphone, and the second power supply pin 212 is connected to the GND pin of the American standard earphone, then the voltage detection pin 111 detects the The voltage of the second power supply pin 212 is in the first voltage range. At this time, Q1, Q1', Q2, and Q2' are turned off, Q3 and Q3' are turned on, and the output port OUT is connected to the port PORT2, so that the first power supply pin 211 Grounding, the second power pin 212 is connected to the positive terminal of the power supply, for example, connected to the bias voltage VBIAS through the pull-up resistor Rup, so as to support the normal operation of the American standard earphone.

When the European standard earphone is inserted into the audio connector 210, the first power pin 211 is connected to the GND pin of the European standard earphone, and the second power pin 212 is connected to the MIC pin of the European standard earphone, then the voltage detection pin 111 detects the first The voltage of the two power supply pins 211 is in the second voltage range. At this time, Q1, Q1', Q2, and Q2' are turned on, Q3 and Q3' are turned off, and the output port OUT is connected to the port PORT1, so that the first power supply pin 211 is connected. To the positive terminal of the power supply, the second power supply pin 212 is grounded, so as to support the normal operation of the European standard earphone.

In some embodiments, the output port OUT is connected to the port PORT2 so that the first power supply pin 211 is grounded, and the second power supply pin 212 is connected to the positive terminal of the power supply in various specific implementations. As one implementation, it may be As shown in FIGS. 6 and 7 , the switching control circuit 100 may further include a first inverter 141 and a second inverter 142. At this time, the port PORT1 and the port PORT2 are both connected to the same positive power supply and ground. The port PORT2 is connected to the first power supply terminal 220 through the first inverter 141, and is connected to the second power supply terminal 230 through the second inverter 142, so that when the output port OUT is connected to the port PORT2, the first power supply pin 211 It is equivalent to being connected to the ground terminal, and the second power pin 212 is equivalent to being connected to the positive terminal of the power supply. Therefore, by connecting the output port OUT to the port PORT1 or the port PORT2, different types of audio playback devices can be supported to achieve compatibility.

As another implementation manner, the first inverter 141 and the second inverter 142 may not be used, the connection of the port PORT1 may remain unchanged as shown in FIGS. 6 and 7 , and the port PORT2 is connected to the first power supply pin 211 The connected pin is connected to the second power supply terminal 212 to connect to the ground terminal, and the pin of the port PORT2 connected to the second power supply pin 212 is connected to the first power supply terminal 211 to connect to the positive terminal of the power supply. Implement the opposite connection to port PORT1.

In addition, in some embodiments, when the target power supply pin is the first power supply pin 211, and when the target power supply pin is the second power supply pin 212, the same MOS combination can also be used, but in this case, as a In one embodiment, since the levels of the first power supply pin 211 and the second power supply pin 212 are opposite, in the case of using the same combination of MOS transistors, if the voltage detection pin 111 is connected to a different target power supply pin, the An inverter is connected between the power supply pin and the voltage detection pin 111, so that the level of the target power supply pin is reversed by the inverter before being input to the first switch unit 121 and the third switch unit through the voltage detection pin 111 131.

In one embodiment, the combination of MOS transistors shown in FIG. 4 can be used, and the voltage detection pin 111 is connected to the first power supply pin 211, as shown in FIG. 6; In the MOS transistor combination shown in FIG. 4, the voltage detection pin 111 is connected to the second power supply pin 122 through an inverter, so as to invert the actual level of the second power supply pin 122 and input it to the first switching unit 121 and the second power supply pin 122. Three switch units 131; in another embodiment, a combination of MOS transistors as shown in FIG. 5 can be used, and the voltage detection pin 111 is connected to the second power supply pin 212, as shown in FIG. 7; in yet another implementation In the method, the combination of MOS transistors as shown in FIG. 5 can be used, and the voltage detection pin 111 is connected to the second power supply pin 212 through an inverter, so as to invert the actual level of the second power supply pin 122 and input it to the first power supply pin 122. A switch unit 121 and a third switch unit 131 .

In a specific example, if the combination of MOS transistors as shown in Figure 4 is used, when the input is at a high level, Q1 and Q2 are turned on and Q3 is turned off; when the input is at a low level, Q1 and Q2 are turned off and Q3 is turned on. At this time, the voltage The detection pin 111 can be connected to the first power pin 211 (such as the MIC pin of the American standard earphone or the GND pin of the European standard earphone). When the input of the voltage detection pin 111 is at a high level, the output port OUT is connected to the port PORT1, When the input is low, connect the output port OUT to port PORT2.

When the voltage detection pin 111 is not connected to the first power supply pin 211, but is connected to the second power supply pin 212 (such as the GND pin of American standard earphones or the MIC pin of European standard earphones), the voltage detection pin 111 is connected to the first power supply pin 212. An inverter can be connected between the two power pins 212, then when the actual level corresponding to the second power pin 212 is a low level (equivalent to the second power pin 212 being connected to the GND pin of the earphone at this time) , that is, the earphones inserted at this time are American standard earphones, the voltage detection pin 111 input Q1, Q3 level is high level, the output port OUT is connected to the port PORT1 to support American standard earphones.

In other embodiments, when the target power supply pin is the first power supply pin 211, and when the target power supply pin is the second power supply pin 212, the same MOS combination may be used, or the target power supply pin may not be used. An inverter is connected between the pin and the voltage detection pin 111, but an inverter is connected between the voltage detection pin 111 and the first switch unit 121, and between the voltage detection pin 111 and the third switch unit 131. The principle Reference may be made to the foregoing description of the inverter being connected between the target power supply pin and the voltage detection pin 111 , and details are not repeated here. It can be understood that as long as the level signals received by the first switch unit 121 and the third switch unit 131 are inverted, the position of the inverter is not limited in this embodiment.

In an example, the voltage detection pin 111 is connected to the first power supply pin 211 , and the voltage detection pin 111 detects the first power supply pin 211 and the input signal input to the switching control circuit is a high level or a low level. At this time, when the American standard earphone is inserted into the audio connector 210, the first power pin 211 is connected to the MIC pin of the American standard earphone, then the input of the voltage detection pin 111 is 1 (high level), Q1 and Q2 are turned on, Q3 is off, at this time, the output port OUT is connected to the port PORT1, that is, the first power pin 211 is connected to the first power supply terminal 220, and the second power supply pin 212 is connected to the second power supply terminal 230, so that the MIC pin of the American standard earphone is connected to the power supply The positive end, the GND pin is grounded to support the normal operation of the American standard earphone; when the European standard earphone is inserted into the audio connector 210, the first power pin 211 is connected to the GND pin of the European standard earphone, and the voltage detection pin 111 is input as 0 (low level), Q1 and Q2 are turned off, and Q3 is turned on. At this time, the output port OUT is connected to the port PORT2, that is, the first power supply pin 211 is connected to the second power supply terminal 230, and the second power supply pin 212 is connected to the first power supply pin 212. The power supply terminal 220 makes the GND pin of the European standard earphone grounded, and the MIC pin is connected to the positive terminal of the power supply, so as to support the normal operation of the European standard earphone. Thereby, compatibility with American standard and European standard headphones can be realized.

As another implementation manner, the first switch unit 121 may be a PMOS transistor, and the second switch unit 122 and the third switch unit 131 may be NMOS transistors. Specifically, please refer to FIG. 5 for the connection relationship of the three switch units, which shows a schematic diagram of the connection of another switching control circuit provided by an exemplary embodiment. 4 are consistent. As shown in FIG. 5 , the first switch unit 121 is a PMOS transistor Q1 , the second switch unit 122 is an NMOS transistor Q2 , and the third switch unit 131 is an NMOS transistor Q3 . And specifically, the gates of Q1 and Q3 are connected to the voltage detection pin 111, the drain of Q1 is connected to VDD, the source of Q1 is connected to the gate of Q2, the source of Q2 is connected to the port PORT1, and the drain of Q2 is connected. It is connected to the output port OUT, the source of Q3 is connected to the port PORT2, and the drain of Q3 is connected to the output port OUT.

In another example, the voltage detection pin 111 is connected to the first power supply pin 211 , and after the voltage detection pin 111 detects the first power supply pin 211 , the input signal input to the switching control circuit is a high level or a low level. At this time, when the American standard earphone is inserted into the audio connector 210, the first power pin 211 is connected to the MIC pin of the American standard earphone, then when the voltage detection pin input is 0 (low level), Q1 and Q2 are turned on, Q3 is off, at this time, the output port OUT is connected to the port PORT1, that is, the first power pin 211 is connected to the first power supply terminal 220, and the second power supply pin 212 is connected to the second power supply terminal 230, so that the MIC pin of the American standard earphone is connected to the power supply The positive end, the GND pin is grounded to support the normal operation of the American standard earphone; when the European standard earphone is inserted into the audio connector 210, the first power pin 211 is connected to the GND pin of the European standard earphone, and the voltage detection pin 111 is input as 1 (high level), Q1 and Q2 are turned off, and Q3 is turned on. At this time, the output port OUT is connected to the port PORT2, that is, the first power supply pin 211 is connected to the second power supply terminal 230, and the second power supply pin 212 is connected to the first power supply pin 212. The power supply terminal 220 makes the GND pin of the European standard earphone grounded, and the MIC pin is connected to the positive terminal of the power supply, so as to support the normal operation of the European standard earphone. Thereby, compatibility with American standard and European standard headphones can be realized.

It should be noted that, for parts not described in detail in this embodiment, reference may be made to the foregoing embodiments, and details are not described herein again.

Due to cost considerations, most mobile terminals with 3.5mm headphone jacks currently on the market cannot support users to insert American standard headphones or European standard headphones at the same time. There is no response or abnormal accompaniment sound, and the human voice is basically eliminated, and the sound is ethereal, resulting in a low user experience. Therefore, in this embodiment, by providing a switching control circuit using a MOS tube as a switching switch, when the audio playback device is connected to the tablet connector 210 , the voltage detection pin 111 detects the target power supply pin connected to the MIC pin or the GND pin of the earphone. target voltage to control the first switch unit 121, the second switch unit 122 and the third switch unit 131 to be turned on or off, so that when the target voltage is in different voltage ranges, the first power supply pin 211, the second power supply pin 211 and the second power supply can be realized. Different connection methods between the pin 212 and the first power supply terminal 220 and the second power supply terminal 230, thereby realizing compatibility with different types of audio playback devices, such as headphones of different standards, so that headphones of different standards can be connected to terminal equipment And work normally, greatly improving the user experience. Moreover, compared with the current solution that uses a switch integrated chip to achieve compatibility, the switching control circuit provided in this embodiment uses a MOS tube as a switching switch to be compatible with both American standard earphones and European standard earphones, with lower cost and lower power consumption. Smaller, the response speed is in the microsecond level, the response speed is faster and no additional control circuit is required. And since the MOS tube can be turned on or off according to the voltage, it is also unnecessary to add a control circuit to control the conduction state of the MOS tube.

Referring to FIG. 8 , an embodiment of the present application further provides a terminal device 80 . The terminal device 80 may include a casing 810 , an audio connector 210 disposed on the casing 810 , and a first power supply disposed in the casing 810 . The terminal 220, the second power supply terminal 230, and the switching control circuit 100 described in the above embodiments.

In this embodiment, the terminal device 80 may be a mobile phone, an MP3 player (Moving Picture Experts Group Audio Layer III, the standard audio layer 3 of the moving picture expert compression), MP4 (Moving Picture Experts Group Audio Layer IV, the standard audio layer 4 of the moving picture expert compression standard) ) player, laptop computer, desktop computer, wearable device or any other terminal.

The switching control circuit 100 is respectively connected with the audio connector 210 , the first power supply terminal 220 and the second power supply terminal 230 . It should be noted that FIG. 8 is only for illustration, and only needs to satisfy the aforementioned connection relationship. As for the specific positions of the switching control circuit 100 , the audio connector 210 , the first power supply terminal 220 and the second power supply terminal 230 in the terminal device 80 , this The embodiment is not limited.

The audio connector 210 is used to connect with an audio playback device. For example, the audio connector 210 can be a headphone holder with a 3.5mm headphone jack, which can be used to connect with a headphone with a 3.5mm headphone jack, so that the headphone can be connected to the terminal through the audio connector 210. device for data transmission.

When the audio playback device is connected to the audio connector 210, the terminal device 80 can select the number of the audio connector 210 based on the switching control circuit 100 described in the foregoing embodiment by detecting whether the audio connector 210 matches the type of the audio playback device. The connection of the first power supply pin 211 and the second power supply pin 212 to the first power supply terminal 220 and the second power supply 230 can realize compatibility with different types of audio playback devices.

In addition, this embodiment does not limit the shape of the casing 810 .

Those skilled in the art can understand that the structure shown in FIG. 8 is for illustration only, and does not constitute a limitation to the terminal device 80, and may include more or less components than the one shown, or combine some components, or adopt different component layout.

The terminal device 80 provided in this embodiment has the same beneficial effects as the foregoing embodiments, and details are not described herein again.

Please refer to FIG. 9 , which shows that an embodiment of the present application further provides a handover control method, which can be applied to the above-mentioned terminal device, and the method includes:

Step S110: When the audio connector is connected to the audio playback device, it is detected whether the types of the audio connector and the audio playback device match.

Step S120: When the audio connector matches the type of the audio playback device, the first power supply pin is connected to the first power supply terminal, and the second power supply pin is connected to the second power supply terminal.

Step S130: When the audio connector does not match the type of the audio playback device, connect the first power supply pin to the second power supply terminal, and connect the second power supply pin to the first power supply terminal.

In this embodiment, the type of the positive terminal of the power supply is opposite to that of the negative terminal of the power supply or the ground terminal, and the types of the first power supply terminal and the second power supply terminal are opposite, that is, as an embodiment, the first power supply terminal is the positive terminal of the power supply, and the second power supply terminal The terminal can be the negative terminal of the power supply or the ground terminal. As another implementation manner, the first power supply terminal is the negative terminal of the power supply or the ground terminal, and the second power supply terminal may be the positive terminal of the power supply.

Because when the audio connector is connected to the audio playback device, it can automatically detect whether the type of the audio connector and the audio playback device match, and when the type matches, the first power supply pin and the first power supply terminal are conducted. When matching, the first power supply pin is connected to the opposite second power supply terminal, and the second power supply terminal is connected to the second power supply pin. When the types do not match, the types are reversed.

The above-mentioned steps may refer to the foregoing embodiments. In addition, the above-mentioned method can be applied to the above-mentioned switching control circuit and terminal, that is, the method can use the above-mentioned switching control circuit and terminal as an execution carrier, and achieve the beneficial effects described in the above-mentioned embodiments. , specifically, reference may be made to the foregoing embodiments, which will not be repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced; and these modifications or replacements do not drive the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A switching control circuit is characterized in that, it is applied to terminal equipment, and the terminal equipment comprises a first power supply terminal, a second power supply terminal and an audio frequency connector, and the audio frequency connector comprises a first power supply pin and a second power supply terminal. a power supply pin, the switching control circuit includes: a detection module, a first switch module and a second switch module; the first power pin is connected to the first power supply terminal through the first switch module, and is connected to the second power supply terminal through the second switch module; the second power pin is connected to the second power supply terminal through the first switch module, and is connected to the first power supply terminal through the second switch module; The detection module is connected to the first power supply pin or the second power supply pin, and is used to detect the audio connector and the audio playback device when the audio playback device is connected to the audio connector. Whether the type matches; The first switch module is connected to the detection module, and is used to conduct the first power supply pin and the first power supply terminal when the audio connector matches the type of the audio playback device , conducting the second power supply pin with the second power supply terminal, and when the audio connector does not match the type of the audio playback device, connecting the first power supply pin with the first power supply pin A power supply terminal is disconnected, and the second power supply pin is disconnected from the second power supply terminal; The second switch module is connected to the detection module, and is used to connect the first power supply pin to the second power supply terminal when the audio connector does not match the type of the audio playback device. connect the second power supply pin with the first power supply terminal, and when the audio connector matches the type of the audio playback device, connect the first power supply pin with the first power supply pin The two power supply terminals are disconnected, and the second power supply pin is disconnected from the first power supply terminal. 2. The switching control circuit according to claim 1, wherein the detection module comprises a voltage detection pin; the voltage detection pin is connected to the first power supply pin or the second power supply pin connected to detect the target voltage of the target power supply pin, and output to the first switch module and the second switch module, the target power supply pin is the first power supply pin or the second power supply pin; The first switch module is configured to conduct the first power supply pin and the first power supply terminal when the target voltage of the target power supply pin is in a first voltage range, and connect the second power supply The pin is connected to the second power supply terminal, and when the target voltage of the target power supply pin is in the second voltage range, the first power supply pin is disconnected from the first power supply terminal, and the the second power supply pin is disconnected from the second power supply terminal; The second switch module is used for disconnecting the first power supply pin from the second power supply terminal when the voltage of the target power supply pin is in a first voltage range, and connecting the second power supply The pin is disconnected from the first power supply terminal, and when the voltage of the target power supply pin is in the second voltage range, the first power supply pin is connected to the second power supply terminal, and all the The second power supply pin is connected to the first power supply terminal. 3. The switching control circuit according to claim 1 or 2, wherein the first switch module comprises a first switch unit and a second switch unit; the first switch unit is connected to the detection module and the second switch unit, and is used for controlling the conduction state of the second switch unit according to the detection result detected by the detection module; The second switch unit is connected between the first power supply pin and the first power supply terminal, and is also connected between the second power supply pin and the second power supply terminal. The switch unit and the second switch unit are configured to be turned on when the types of the audio connector and the audio playback device are matched, and disconnected when they are not matched. 4 . The switching control circuit according to claim 3 , wherein the second switch module comprises a third switch unit, the third switch unit is connected to the detection module, and the third switch unit is connected to the detection module. 5 . between the first power supply pin and the second power supply terminal, the third switch unit is further connected between the second power supply pin and the first power supply terminal; The first switch unit, the second switch unit and the third switch unit are composed of insulated gate field effect transistors. 5 . The switching control circuit according to claim 4 , wherein the voltage detection pin is connected to the first power supply pin, the first voltage range corresponds to a high level, and the second voltage The range corresponds to a low level, the first power supply terminal is the positive terminal of the power supply, and the second power supply terminal is the ground terminal; The first switch unit is formed by an N-channel type insulated gate field effect transistor, the second switch unit and the third switch unit are formed by a P-channel type insulated gate field effect transistor; The first gate of the first switch unit is connected to the voltage detection pin, the first source of the first switch unit is connected to the ground, and the first drain of the first switch unit is connected to the the second gate of the second switch unit is connected; The second source of the second switch unit is respectively connected to the first power supply terminal and the second power supply terminal, and the second drain of the second switch unit is respectively connected to the first power supply pin, the second power supply terminal and the second power supply terminal. the second power pin connection; The third gate of the third switch unit is connected to the voltage detection pin, the third source of the third switch unit is respectively connected to the first power supply terminal and the second power supply terminal, and the third power supply terminal is connected to the third power supply terminal. The drains are respectively connected to the first power supply pin and the second power supply pin. 6 . The switching control circuit according to claim 5 , wherein the voltage detection pin is connected to the first power supply pin, the first voltage range corresponds to a low level, and the second voltage The range corresponds to a high level, and the switching control circuit further includes a first inverter and a second inverter; The third source of the third switch unit is respectively connected to the first power supply terminal through the first inverter, and is connected to the second power supply terminal through the second inverter. 7 . The switching control circuit according to claim 4 , wherein the voltage detection pin is connected to the second power supply pin, and the first voltage range corresponds to a low level, and the second voltage The range corresponds to a high level, the first power supply terminal is the ground terminal, and the second power supply terminal is the positive terminal of the power supply; The first switch unit is formed by a P-channel type insulated gate field effect transistor, the second switch unit and the third switch unit are formed by an N-channel type insulated gate field effect transistor; The first gate of the first switch unit is connected to the voltage detection pin, the first drain of the first switch unit is connected to the positive terminal of the power supply, and the first source of the first switch unit is connected to the power supply. connecting the second gate of the second switch unit; The second source of the second switch unit is respectively connected to the first power supply terminal and the second power supply terminal, and the second drain of the second switch unit is respectively connected to the first power supply pin, the second power supply terminal and the second power supply terminal. the second power pin connection; The third gate of the third switch unit is connected to the voltage detection pin, the third source of the third switch unit is respectively connected to the first power supply terminal and the second power supply terminal, and the The third drain of the third switch unit is respectively connected to the first power supply pin and the second power supply pin. 8. The switching control circuit according to claim 1, wherein the audio playback device is an earphone. 9. A terminal device, comprising: case; an audio connector arranged on the casing; The first power supply terminal, the second power supply terminal and the switching control circuit according to any one of the above claims 1-8 are provided in the casing. 10. A switching control method, characterized in that it is applied to a terminal device, the terminal device comprising a first power supply terminal, a second power supply terminal and an audio connector, and the audio connector includes a first power supply pin and a second power supply pin. power supply pins, the method includes: When the audio connector is connected to the audio playback device, detecting whether the audio connector matches the type of the audio playback device; When the audio connector matches the type of the audio playback device, the first power supply pin is connected to the first power supply terminal, and the second power supply pin is connected to the second power supply terminal. turn on; When the audio connector does not match the type of the audio playback device, the first power supply pin is connected to the second power supply terminal, and the second power supply pin is connected to the first power supply terminal is turned on.

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