CN214591942U - Charging and communication conversion circuit of Bluetooth headset - Google Patents
Charging and communication conversion circuit of Bluetooth headset Download PDFInfo
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- CN214591942U CN214591942U CN202120785673.8U CN202120785673U CN214591942U CN 214591942 U CN214591942 U CN 214591942U CN 202120785673 U CN202120785673 U CN 202120785673U CN 214591942 U CN214591942 U CN 214591942U
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Abstract
The invention provides a charging and communication conversion circuit of a Bluetooth headset, which comprises a 5V power supply, an external high level and an external low level, wherein when a first resistor introduces the high level, a first MOS (metal oxide semiconductor) tube is conducted with a second MOS tube, and the 5V power supply is connected to the Bluetooth headset through the second MOS tube for charging; when the first resistor introduces a low level, the first MOS tube is cut off from the second MOS tube, the third MOS tube is conducted, the 5V power supply is subjected to voltage division by the third resistor and the fourth resistor and then is reduced to 2.5V, the fourth MOS tube is conducted with the fifth MOS tube, and the Bluetooth headset is switched to a communication mode. The Bluetooth headset voltage conversion circuit utilizes the first MOS tube, the second MOS tube, the third MOS tube, the first resistor, the second resistor, the third resistor and the fourth resistor to jointly combine into a voltage conversion circuit, utilizes the high level and the low level to realize the charging of the Bluetooth headset and the conversion of the Bluetooth headset and the Bluetooth communication mode, has simple circuit design and stable and reliable work, and improves the product competitiveness.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a charging and communication conversion circuit of a Bluetooth headset.
Background
Bluetooth headset is more and more welcomed by the consumer with its convenience, intellectuality, and current bluetooth headset generally cooperates the box of charging and uses, for example apple company's Air posts earphone, but most earphones and the logical design of the cooperation of the box of charging are complicated on the market, and some circuits influence logical design unreasonable, cause to charge and communication state confusion, seriously influence user experience.
Chinese patent 2019104893179 discloses a bluetooth headset charging communication method, which monitors communication signals in real time, judges whether communication starts, judges overtime, performs normal communication, and terminates communication, but the method of the present invention has a complicated circuit design and a high cost, and is not favorable for market promotion.
Chinese patent 2019215862235 discloses a charging base for communicating with bluetooth headset, and charging base is including the charging base body that has the lid structure, and it utilizes and sets up assorted first interface and second interface, couples together respective communication circuit, realizes that charging base directly communicates the operation with bluetooth headset one to one, need not be with the help of other third party's equipment auxiliary communication, has improved the convenience of using. The technical scheme of the invention cannot intelligently identify the working state of the Bluetooth headset in real time, and the intelligent degree is lower.
Therefore, it is necessary to design a bluetooth headset and a charging box thereof, which have a simple circuit design, are stable and reliable in operation, and improve the competitiveness of the product.
Disclosure of Invention
In order to solve the above problems, the present invention provides the following solutions:
a charging and communication conversion circuit of a Bluetooth headset comprises a 5V power supply, an external high level and an external low level, and is characterized by comprising a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first MOS tube Q1, a second MOS tube Q2 and a third MOS tube Q3, wherein the first resistor R1 is connected with the external high level and a grid electrode of the first MOS tube Q1, the second resistor R2 is respectively connected with the 5V power supply, a drain electrode of the first MOS tube Q1 and a grid electrode of the second MOS tube Q2, a drain electrode of the second MOS tube Q2 is respectively connected with the 5V power supply and the third resistor R3, a grid electrode of the third MOS tube Q3 is connected with a drain electrode of the first MOS tube Q1, a drain electrode of the third MOS tube Q3 is connected with the 5V power supply through the fourth resistor R4 and the third resistor R3, and a source electrode of the third MOS tube Q3 is grounded;
when the first resistor R1 is led to high level, the first MOS transistor Q1 and the second MOS transistor Q2 are conducted, and the 5V power supply is connected to the Bluetooth headset through the second MOS transistor Q2 for charging;
when the first resistor R1 introduces a low level, the first MOS transistor Q1 and the second MOS transistor Q2 are cut off, the third MOS transistor Q3 is turned on, a 5V power supply is divided by the third resistor R3 and the fourth resistor R4 and then is reduced to 2.5V, the voltage is connected to the Bluetooth headset, the fourth MOS transistor Q4 and the fifth MOS transistor Q5 are turned on, and the Bluetooth headset is switched to a communication mode.
Further, the high level is 3V-4.2V, and the low level is 0V.
The Bluetooth headset voltage conversion circuit utilizes the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 to jointly combine into a voltage conversion circuit, utilizes high level and low level to realize the charging of the Bluetooth headset and the conversion of Bluetooth communication modes, has simple circuit design and stable and reliable work, and improves the product competitiveness.
Drawings
FIG. 1 is a schematic diagram of a charging and communication switching circuit of a Bluetooth headset according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a schematic diagram of a charging and communication switching circuit of a bluetooth headset according to the present invention is shown, in which the working principle of the present invention is as follows:
the invention is applied to a Bluetooth earphone and a charging box thereof, the charging/communication conversion circuit realizes the voltage conversion from 5V voltage to 5V and 2.5V voltage of a charging end of the Bluetooth earphone, thereby achieving the function of completing the charging of the Bluetooth earphone or the communication of the Bluetooth earphone, entering a charging mode of the Bluetooth earphone when the voltage of the charging end of the Bluetooth earphone is 5V, and entering a communication mode when the voltage of the charging end of the Bluetooth earphone is 2.5V.
The charging and communication conversion circuit comprises a 5V power supply, an external high level and an external low level, and comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first MOS tube Q1, a second MOS tube Q2 and a third MOS tube Q3, wherein the first resistor R1 is connected with the external high level and the grid electrode of the first MOS tube Q1, the second resistor R2 is respectively connected with the 5V power supply, the drain electrode of the first MOS tube Q1 and the grid electrode of the second MOS tube Q2, the drain electrode of the second MOS tube Q2 is respectively connected with the 5V power supply and the third resistor R3, the source electrode of the second MOS tube Q2 is connected with one end of the third resistor R3 and the fourth resistor R4, the grid electrode of the third MOS tube Q3 is connected with the drain electrode of the first MOS tube Q1, the drain electrode of the third MOS tube Q3 is connected with the ground through the fourth resistor R4 and the third resistor R3, and the source electrode of the third MOS tube Q3.
Specifically, when the bluetooth headset needs to be charged, the high level introduced by the first resistor R1 enables the first MOS transistor Q1 and the second MOS transistor Q2 to be connected, the 5V power supply is connected to the charging end of the bluetooth headset, and the R +, R-, L +, and L-terminals implement the function of charging the bluetooth headset.
When the Bluetooth headset needs to communicate with the Bluetooth headset, the low level introduced by the first resistor R1 enables the first MOS tube Q1 and the second MOS tube Q2 to be cut off, the third MOS tube Q3 is conducted, the 5V power supply is subjected to voltage division through the third resistor R3 and the fourth resistor R4 and then is reduced to 2.5V, then four terminals of a charging end R +, R-, L + and L-of the Bluetooth headset are transmitted, the Bluetooth headset is switched to a communication mode, and meanwhile, the fourth MOS tube Q4 and the fifth MOS tube Q5 of a communication circuit are opened, so that the communication function is achieved.
The high level is 3V-4.2V and the low level is 0V.
The fifth resistor R5 and the seventh resistor R7 are respectively connected with the source electrode of the second MOS transistor Q2 and serve as series resistors to protect the charging circuit, and when the charging port is accidentally short-circuited by the metal conducting pieces, the fifth resistor R5 and the seventh resistor R7 can play a role in protection, so that the charging box is not damaged due to short circuit of the port.
The sixth resistor R6 and the eighth resistor R8 are charging current detection resistors for earphone, which send the detected current signals to an I/O port (not shown) of the main control circuit for processing, the ninth resistor R9 and the tenth resistor R10 are gate control resistors of the fourth MOS transistor Q4 and the fifth MOS transistor Q5, which are connected to the main control circuit, and the eleventh resistor R11 and the twelfth resistor R12 are channel resistors for the main control circuit to communicate TX signals and RX signals with the earphone.
The Bluetooth headset voltage conversion circuit utilizes the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 to jointly combine into a voltage conversion circuit, utilizes high level and low level to realize the charging of the Bluetooth headset and the conversion of Bluetooth communication modes, has simple circuit design and stable and reliable work, and improves the product competitiveness.
Claims (2)
1. A charging and communication switching circuit of a Bluetooth headset comprises a 5V power supply, an external high level and an external low level, and is characterized by comprising a first resistor, a second resistor, a third resistor, a fourth resistor, a first MOS (metal oxide semiconductor) tube, a second MOS tube and a third MOS tube, wherein the first resistor is connected with the external high level and a grid electrode of the first MOS tube;
when the first resistor is introduced with a high level, the first MOS tube is conducted with the second MOS tube, and a 5V power supply is connected to the Bluetooth headset through the second MOS tube for charging;
when the first resistor introduces a low level, the first MOS tube is cut off from the second MOS tube, the third MOS tube is conducted, the 5V power supply is connected to the Bluetooth headset for 2.5V after voltage division through the third resistor and the fourth resistor, the fourth MOS tube is conducted with the fifth MOS tube, and the Bluetooth headset is switched to a communication mode.
2. The charging and communication converting circuit of claim 1, wherein the high level is 3V to 4.2V, and the low level is 0V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120785673.8U CN214591942U (en) | 2021-04-16 | 2021-04-16 | Charging and communication conversion circuit of Bluetooth headset |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120785673.8U CN214591942U (en) | 2021-04-16 | 2021-04-16 | Charging and communication conversion circuit of Bluetooth headset |
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| CN214591942U true CN214591942U (en) | 2021-11-02 |
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| CN202120785673.8U Active CN214591942U (en) | 2021-04-16 | 2021-04-16 | Charging and communication conversion circuit of Bluetooth headset |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114513726A (en) * | 2022-01-28 | 2022-05-17 | 珠海昇生微电子有限责任公司 | Level switching time-sharing multiplexing and isolating circuit and method and TWS earphone system |
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2021
- 2021-04-16 CN CN202120785673.8U patent/CN214591942U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114513726A (en) * | 2022-01-28 | 2022-05-17 | 珠海昇生微电子有限责任公司 | Level switching time-sharing multiplexing and isolating circuit and method and TWS earphone system |
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