CN218352191U - TWS earphone circuit - Google Patents
TWS earphone circuit Download PDFInfo
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- CN218352191U CN218352191U CN202123139437.8U CN202123139437U CN218352191U CN 218352191 U CN218352191 U CN 218352191U CN 202123139437 U CN202123139437 U CN 202123139437U CN 218352191 U CN218352191 U CN 218352191U
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Abstract
The embodiment of the utility model discloses a TWS earphone circuit, which comprises a power control switch and a voltage detection module; the charging box power supply is connected with the output end of the charging box power supply through the power supply control switch; the voltage detection module is used for detecting whether the power supply voltage of the charging box meets a first preset condition when the charging box and the earphone are in a first working state; and controlling the power supply control switch to be switched on when a first preset condition is met. When the charging box power supply voltage meets a first preset condition, the power supply control switch is turned on, the charging box is used for charging the earphone, and the charging safety is improved. The charging box is prevented from being charged under the conditions of a communication state with lower voltage and the like, the safety can be improved, and meanwhile, a certain protection and anti-interference effect is realized on related communication modules and the like.
Description
Technical Field
The utility model relates to a bluetooth headset technical field especially relates to a TWS earphone circuit.
Background
TWS is an abbreviation of True Wireless Stereo, i.e. the True Wireless Stereo meaning, and TWS technology is also based on the development of bluetooth chip technology. The working principle of the Bluetooth headset is that the devices such as the mobile phone are connected with the main headset, and then the main headset is quickly connected with the auxiliary headset in a wireless mode, so that real wireless separation of the left and right sound channels of the Bluetooth is realized.
The TWS earphone is charged through the charging box, and the charging box and the earphone can be charged and can also be used for data communication. For example, utility model patent application No. CN202120209585.3 provides a TWS earphone charging box control circuit and TWS earphone charging box, including: TWS earphone charging box control circuit includes: the terminal comprises a control key, a processor, a port module, a charging circuit and a communication circuit, wherein the control key is used for outputting a trigger signal after being triggered, the processor is connected with the control key, the processor is used for receiving the trigger signal and outputting a charging control signal and a communication control signal according to the trigger signal, the port module is set to be of a two-pin structure, the port module is used for being connected with a TWS earphone, the charging circuit is connected with the processor, the charging circuit is used for receiving the charging control signal and outputting a charging voltage to the port module according to the charging control signal, the communication circuit is connected with the processor, and the communication circuit is used for receiving the communication control signal and outputting communication information to the port module according to the communication control signal. Above-mentioned utility model patent through setting up the port module into two pin structures, makes the pin of port module have the function of charging and communication simultaneously, nevertheless charges and selects through the button with communication function, and not the circuit is automatic adjusts according to the circumstances such as the signal of telecommunication, operates inconveniently.
The required energy of communication of data between box and the earphone that charges is lower, if still adopt the loss that the charging voltage value transmitted can cause the electric energy, and carry out data communication transmission when charging, probably cause the interference to the communication transmission of data, and have certain influence to electronic components's security, how to avoid charging and the mutual interference of communication state according to the state automatic adjustment mode of box and earphone that charges, is the problem that this field needs to be solved.
SUMMERY OF THE UTILITY MODEL
Accordingly, in order to solve the above-mentioned problem of potential safety hazard in the process of performing data transmission between the charging box and the earphone at the same time, a TWS earphone circuit is provided to separate the charging process and the communication process between the charging box and the earphone, thereby improving the safety of the earphone.
The embodiment of the utility model provides a TWS earphone circuit, including power control switch and voltage detection module; the charging box power supply is connected with the output end of the charging box power supply through the power supply control switch;
the voltage detection module is used for detecting whether the power supply voltage of the charging box meets a first preset condition when the charging box and the earphone are in a first working state; and controlling the power supply control switch to be conducted when a first preset condition is met.
In one embodiment, the TWS headset circuit further comprises a first communication module for communicating the charging box and the headset;
the voltage detection module is used for detecting whether the power supply voltage of the charging box meets a second preset condition when the charging box and the earphone are in a second working state; and when a second preset condition is met, the power supply control switch is controlled to be switched off, and the first communication module works.
In one embodiment, the first operating state is a charging state.
In one embodiment, the first preset condition is that the voltage output by the charging box is higher than 3.5V.
In one embodiment, the second operating state is a communication state.
In one embodiment, the second preset condition is that the voltage output by the charging box is higher than 3.5V.
In one embodiment, the power control switch is a triode or a field effect transistor.
In one embodiment, the first communication module communicates based on a single-wire duplex UART.
In one embodiment, the power control switch is a P-type field effect transistor, and the voltage detection module is a first chip; the source electrode of the P-type field effect transistor is connected with a charging box power supply, the drain electrode of the P-type field effect transistor is connected with the output end of the charging box power supply, the grid electrode of the P-type field effect transistor is respectively connected with the cathode of the first diode and the ninth pin of the first chip, and the source electrode of the P-type field effect transistor is connected with the grid electrode through the fourth resistor; the anode of the first diode is connected with the fourth pin of the first chip, and the anode of the first diode is grounded through a first capacitor; the tenth pin of the first chip is connected with the first power supply terminal through a first resistor; a first pin of the first chip is grounded through a second capacitor; a second pin of the first chip is connected with the cathode of a second diode, the anode of the second diode is connected with a second power supply terminal, and the second pin of the first chip is grounded through a third capacitor; a third pin of the first chip is connected with a power supply of the charging box through a fifth resistor; the fifth pin of the first chip is grounded.
In one embodiment, the first communication module is a first chip; a seventh pin and an eighth pin of the first chip are connected with a second communication module of the earphone; a seventh pin of the first chip is connected with the first power supply terminal through a third resistor; the eighth pin of the first chip is connected with the first power supply terminal through the second resistor.
Implement the embodiment of the utility model provides a, will have following beneficial effect:
1. when the power supply voltage of the charging box meets a first preset condition, the power supply control switch is turned on, so that the charging box carries out charging operation on the earphone, and the charging safety is ensured;
2. when the power supply voltage of the charging box meets a second preset condition, the charging box and the earphone are subjected to data communication after the power supply control switch is switched off. Compared with the prior art that the charging box without detection directly performs data communication with the earphone, the interference of the charging process to the data communication can be avoided, and the safety of the data communication is improved;
3. the charging process and the communication process between the charging box and the earphone are separated, so that the safety of the earphone is improved; in the charging process, the charging is carried out only when the voltage value meets the condition, the charging environment can be monitored to a certain extent, and the charging efficiency and the charging safety are improved; the charging is cut off in the communication process, so that the safety is improved;
4. the charging and communication work in the optimal voltage range respectively, so that the working effect can be improved, and meanwhile, the energy is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Wherein:
FIG. 1 is a system block diagram of TWS headset circuitry in one embodiment;
FIG. 2 is a circuit diagram of a TWS headset circuit in one embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a TWS headset circuit, including a power control switch and a voltage detection module; the charging box power supply is connected with the output end of the charging box power supply through the power supply control switch;
the voltage detection module is used for detecting whether the power supply voltage of the charging box meets a first preset condition when the charging box and the earphone are in a first working state; and controlling the power supply control switch to be conducted when a first preset condition is met.
In this embodiment, the TWS headset circuit correspondingly detects the power supply voltage of the charging box, and the power control switch is turned on only when the power supply voltage of the charging box meets a first preset condition, so that the charging box performs charging operation on the headset. Compared with the prior art that the earphone is directly charged by the undetected charging box, the charging safety can be improved. Most of the existing circuits do not detect the voltage condition of the charging box, and the charging state is ensured only when the current voltage is suitable for charging through detecting the voltage value; the charging box is prevented from being charged when the charging box is in a lower-voltage communication state and the like, the safety can be improved, and meanwhile, a certain protection and anti-interference effect is achieved on related communication modules and the like.
In one embodiment, the TWS headset circuit further comprises a first communication module for communicating the charging box and the headset;
the voltage detection module is used for detecting whether the power supply voltage of the charging box meets a second preset condition when the charging box and the earphone are in a second working state; and when a second preset condition is met, the power supply control switch is controlled to be switched off, and the first communication module works.
In this embodiment, the TWS headset circuit performs corresponding detection on the power supply voltage of the charging box, and when the power supply voltage of the charging box satisfies a second preset condition, the charging box and the headset perform data communication after the power supply control switch is turned off. Compared with the prior art that the charging box without detection directly performs data communication with the earphone, the safety of the data communication can be improved. Most of the existing circuits do not detect the voltage condition of the charging box, and the communication state is ensured only when the current voltage is suitable for data communication by detecting the voltage value; the data communication is carried out when the charging box is in the conditions of higher charging state and the like, so that the safety can be improved, and meanwhile, a certain protection and anti-interference effect is realized on related communication modules and the like.
The charging process and the communication process between the charging box and the earphone are separated, so that the safety of the earphone is improved; in addition, the charging and communication work in the optimal voltage range respectively, so that the working effect can be improved, and meanwhile, the energy is saved.
In one embodiment, the first operating state is a charging state.
In one embodiment, the first preset condition is that the voltage output by the charging box is higher than 3.5V.
The TWS headset circuit described in this embodiment performs corresponding detection on the power supply voltage of the charging box, and only when the power supply voltage of the charging box is higher than 3.5V, the power supply control switch is turned on, so that the charging box performs charging operation on the headset. Compared with the prior art that the earphone is directly charged by the undetected charging box, the charging safety can be improved.
In one embodiment, the second operating state is a communication state.
In one embodiment, the second preset condition is that the voltage output by the charging box is higher than 3.5V.
In this embodiment, the TWS headset circuit performs corresponding detection on the power supply voltage of the charging box, and when the power supply voltage of the charging box is higher than 3.5V, the charging box and the headset perform data communication after the power supply control switch is turned off. Compared with the prior art that the charging box without detection directly performs data communication with the earphone, the safety of the data communication can be improved.
In one embodiment, the power control switch is a triode or a field effect transistor.
The triode or the field effect transistor is a common circuit switch design element, the conduction and the disconnection of the triode or the field effect transistor can be controlled by controlling the base electrode of the triode or the grid electrode of the field effect transistor, the design mode is simple, the realization is convenient, and the cost is low.
In one embodiment, the first communication module communicates based on a single wire duplex UART.
The single-wire duplex UART is a common communication mode, has a simple circuit, is convenient to realize, and can be well applied to the TWS earphone.
In one embodiment, the power control switch is a P-type field effect transistor Q1, and the voltage detection module is a first chip U1; the source S of the P-type field effect transistor Q1 is connected with a charging box power supply USB _ VBUS _ IN, the drain D of the P-type field effect transistor Q1 is connected with a charging box power supply output end USB _ VBUS _ OUT, the gate G of the P-type field effect transistor Q1 is respectively connected with the cathode of the first diode D1 and the ninth pin CHG _ EN of the first chip U1, and the source S of the P-type field effect transistor Q1 is connected with the gate G through a fourth resistor R4; the anode of the first diode D1 is connected with the fourth pin V _ DET1 of the first chip U1, and the anode of the first diode D1 is grounded through the first capacitor C1; the tenth pin TWS _ RST of the first chip U1 is connected to the first power supply terminal 1v8 \ smps through the first resistor R1; a first pin SLEEP _ EN of the first chip U1 is grounded through a second capacitor C2; a second pin VDD of the first chip U1 is connected with a cathode of a second diode D2, an anode of the second diode D2 is connected with a second power supply terminal VBAT, and the second pin VDD of the first chip U1 is grounded through a third capacitor C3; a third pin UART of the first chip U1 is connected with a charging box power supply USB _ VBUS _ IN through a fifth resistor R5; the fifth pin GND of the first chip U1 is grounded.
The TWS headset circuit may be designed by using a bluetooth chip, and a specific circuit example is given in this embodiment. Specifically, a power supply control switch is designed by adopting a P-type field effect transistor Q1, and a voltage detection module is designed by adopting a first chip U1. Specifically, a tenth pin TWS _ RST of the first chip U1, namely a reset pin, is connected to a first power terminal 1v8 \ smps, a second pin VDD of the first chip U1, namely a power pin, is connected to a second power terminal VBAT through a second diode D2, and a fifth pin GND of the first chip U1, namely a ground pin.
In this embodiment, since the power control switch is designed for the P-type fet Q1, when the charging box and the earphone are in the first working state, that is, when the charging box and the earphone are in the charging state, if the charging box power voltage meets the first preset condition, the ninth pin CHG _ EN of the first chip U1 is controlled to output a low level, and the P-type fet Q1 serving as the power control switch is controlled to be turned on, so that the charging box can safely charge the earphone. Specifically, when the charging box and the earphone are IN a charging state, the charging box power supply voltage USB _ VSUB _ IN is 5V voltage, the voltage value detected inside the first chip U1 at the moment meets a first preset condition, namely when the voltage value detected inside the first chip U1 is higher than 3.5V, the ninth pin CHG _ EN of the first chip U1 outputs low level, so that the P-type field effect transistor Q1 is conducted, and the charging box can be used for safely charging the earphone at the moment.
This embodiment passes through first chip U1 carry out corresponding detection to the mains voltage of the box that charges, when the box mains voltage that charges satisfies first predetermined condition, just make power control switch on, let the box that charges charge the operation to the earphone. Compared with the prior art that the earphone is directly charged by the undetected charging box, the charging safety can be improved. Most of the existing circuits do not detect the voltage condition of the charging box, and the charging state is only started when the current voltage is suitable for charging through detecting the voltage value; the charging box is prevented from being charged in a lower communication state and the like, so that the safety can be improved, and meanwhile, a certain protection and anti-interference effect is realized on related communication modules and the like.
In one embodiment, the first communication module is a first chip U1; a seventh pin RX and an eighth pin TX of the first chip U1 are connected with a second communication module of the earphone; a seventh pin RX of the first chip U1 is connected to the first power supply terminal 1v8 \ U smps via a third resistor R3; the eighth pin TX of the first chip U1 is connected to the first power supply terminal 1v8 \ U smps via a second resistor R2.
In this embodiment, because the P-type fet Q1 adopted in this embodiment is designed with the power control switch, when the charging box and the earphone are in the second working state, that is, when the charging box and the earphone are in the communication state, if the charging box power supply voltage meets the second preset condition, the ninth pin CHG _ EN of the first chip U1 is controlled to output a high level, the P-type fet Q1 as the power control switch is controlled to be turned off, so that the charging box and the earphone do not perform the charging operation any more, at this time, the charging box and the earphone can perform safe data communication, and the influence of the charging process and other factors on the data communication is avoided. Specifically, when the charging box and the earphone are IN a communication state, the charging box power supply voltage USB _ VSUB _ IN is 2.8V voltage, the voltage value detected inside the first chip U1 at the moment meets a second preset condition, namely when the voltage value detected inside the first chip U1 is higher than 3.5V, the ninth pin CHG _ EN of the first chip U1 outputs high level, so that the P-type field effect transistor Q1 is cut off, and the charging box can be IN safe communication with the earphone at the moment.
In this embodiment, the TWS headset circuit performs corresponding detection on the power supply voltage of the charging box, and when the power supply voltage of the charging box meets a second preset condition, the charging box and the headset perform data communication after the power supply control switch is turned off. Compared with the prior art that the charging box without detection directly performs data communication with the earphone, the safety of the data communication can be improved. Most of the existing circuits do not detect the voltage condition of the charging box, and the communication state is ensured only when the current voltage is suitable for data communication by detecting the voltage value; the data communication is carried out when the charging box is in a higher charging state and the like, so that the safety can be improved, and meanwhile, a certain protection and anti-interference effect is realized on related communication modules and the like.
The charging process and the communication process between the charging box and the earphone are separated, so that the safety of the earphone is improved; in addition, the charging and communication work in the optimal voltage range respectively, so that the working effect can be improved, and meanwhile, the energy is saved.
Besides the implementation of the TWS headset circuit in this embodiment by using a bluetooth chip, other control chips or hardware circuits such as a voltage comparator may be used to implement the determination of the first preset condition and the second preset condition.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (4)
1. A TWS earphone circuit is characterized in that the TWS earphone circuit is used for detecting the power supply voltage of a charging box and comprises a power supply control switch and a voltage detection module; the voltage detection module is connected with the power supply output end of the charging box through the power supply control switch;
the voltage detection module is used for detecting that the power supply voltage of the charging box and the earphone in a charging state is higher than 3.5V and controlling the conduction of the power supply control switch;
the power supply control switch is a P-type field effect transistor, and the voltage detection module is a first chip; the source electrode of the P-type field effect transistor is connected with a charging box power supply, the drain electrode of the P-type field effect transistor is connected with the output end of the charging box power supply, the grid electrode of the P-type field effect transistor is respectively connected with the cathode of the first diode and the ninth pin of the first chip, and the source electrode of the P-type field effect transistor is connected with the grid electrode through the fourth resistor; the anode of the first diode is connected with the fourth pin of the first chip, and the anode of the first diode is grounded through a first capacitor; the tenth pin of the first chip is connected with the first power supply terminal through a first resistor; a first pin of the first chip is grounded through a second capacitor; a second pin of the first chip is connected with the cathode of a second diode, the anode of the second diode is connected with a second power supply terminal, and the second pin of the first chip is grounded through a third capacitor; a third pin of the first chip is connected with a power supply of the charging box through a fifth resistor; the fifth pin of the first chip is grounded.
2. The TWS headset circuit of claim 1, further comprising a first communication module for communicating the charging box and the headset;
the voltage detection module is used for detecting that the power supply voltage of the charging box and the earphone is higher than 3.5V when the charging box and the earphone are in a communication state, and controlling the power supply control switch to be switched off.
3. The TWS headset circuit of claim 2, wherein the first communication module communicates based on a single wire duplex UART.
4. The TWS headset circuit of claim 2, wherein the first communication module is a first chip; a seventh pin and an eighth pin of the first chip are connected with a second communication module of the earphone; a seventh pin of the first chip is connected with the first power supply terminal through a third resistor; the eighth pin of the first chip is connected with the first power supply terminal through the second resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123139437.8U CN218352191U (en) | 2021-12-14 | 2021-12-14 | TWS earphone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123139437.8U CN218352191U (en) | 2021-12-14 | 2021-12-14 | TWS earphone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218352191U true CN218352191U (en) | 2023-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123139437.8U Active CN218352191U (en) | 2021-12-14 | 2021-12-14 | TWS earphone circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN218352191U (en) |
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2021
- 2021-12-14 CN CN202123139437.8U patent/CN218352191U/en active Active
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