Headphone protection circuit, protection method and headphone

Abstract

The invention discloses a protection circuit and protection method of a headphone and the headphone, and relates to the technical field of headphones, and the protection circuit of the headphone comprises a first temperature detection circuit which is used for detecting the temperature of a power interface and outputting a corresponding first temperature detection signal; the first switching circuit is arranged in a path between the power interface and the power output end in series; the main control circuit is electrically connected with the controlled end of the first switching circuit and the output end of the first temperature detection circuit; the main control circuit is used for controlling the first switching circuit to disconnect the access between the power interface and the power output end when determining that the temperature of the power interface is greater than a first preset temperature threshold according to the first temperature detection signal; the invention aims to solve the technical problem that a consumer is easily scalded when the temperature of the headphone is too high.

Description

Technical Field

[0001] The present application relates to the technical field of headphones, and in particular to a headphone protection circuit, a headphone protection method and a headphone. Background Art

[0002] With the rise of the concept of the metaverse, various types of headphones have emerged one after another. In order to reduce the weight of the product and improve the experience of wearing headphones, most existing headphones use batteries with smaller capacity to reduce the weight of the headphones. However, due to the small battery capacity, users cannot use the headphones for a long time.

[0003] In order to extend the use time of headphones, many consumers choose to plug the power cord into the headphones while using them. Although this can extend the use time to a certain extent, it undoubtedly increases the possibility of overheating of the headphones. Overheated headphones can not only easily burn consumers, but also damage the internal circuits of the headphones, and even cause explosions, posing certain safety hazards. Summary of the invention

[0004] The main purpose of the present application is to propose a headphone protection circuit, a headphone protection method and a headphone, aiming to solve the technical problem that the headphone may easily burn consumers when the temperature is too high.

[0005] To achieve the above-mentioned purpose, the present application proposes a headphone protection circuit, the headphone comprising a power interface for connecting to a power line and a power output terminal for connecting to a subsequent circuit, the headphone protection circuit comprising:

[0006] a first temperature detection circuit, the first temperature detection circuit being used to detect the temperature of the power interface and output a corresponding first temperature detection signal;

[0007] A first switch circuit, the first switch circuit is arranged in series in a path between the power interface and the power output end;

[0008] a main control circuit, the main control circuit being electrically connected to a controlled end of the first switch circuit and an output end of the first temperature detection circuit respectively;

[0009] The main control circuit is used to control the first switch circuit to disconnect the path between the power interface and the power output end when it is determined according to the first temperature detection signal that the temperature of the power interface is greater than a first preset temperature threshold.

[0010] In one embodiment, the first switch circuit includes:

[0011] A main switch circuit, wherein an input end of the main switch circuit is connected to the power interface, and an output end of the main switch circuit is connected to the power output end;

[0012] A driving circuit is electrically connected to the main control circuit and the controlled end of the main switch circuit respectively.

[0013] In one embodiment, the main switch circuit includes a first switch tube, an input end of the first switch tube is connected to the power interface, and an output end of the first switch tube is connected to the power output end;

[0014] The driving circuit comprises:

[0015] A second switch tube and a first resistor;

[0016] The controlled end of the second switch tube is electrically connected to the main control circuit, the input end of the second switch tube is connected to the power interface, the output end of the second switch tube is connected to the first end of the first resistor, and the second end of the first resistor is grounded;

[0017] The controlled end of the first switch tube is connected to the first end of the first resistor.

[0018] In one embodiment, the main control circuit includes:

[0019] Controller;

[0020] A third switch tube and a second resistor, wherein the first end of the second resistor is connected to the controlled end of the drive circuit, the second end of the second resistor is connected to the input end of the third switch tube, the output end of the third switch tube is grounded, and the controlled end of the third switch tube is electrically connected to the controller.

[0021] In one embodiment, the first temperature detection circuit includes:

[0022] A thermistor and a third resistor, wherein a first end of the third resistor is connected to a first voltage, a second end of the third resistor is connected to the first end of the thermistor, and a second end of the thermistor is grounded;

[0023] The main control circuit is electrically connected to the first end of the thermistor.

[0024] In one embodiment, the headset includes a communication interface and a communication module electrically connected to the communication interface, the communication interface is used to access a communication line; the protection circuit of the headset includes:

[0025] a second switch circuit, the second switch circuit being arranged in series in a path between the communication module and the communication interface;

[0026] a second temperature detection circuit, the second temperature detection circuit being used to detect the temperature of the communication module and output a corresponding second temperature detection signal;

[0027] The output end of the second temperature detection circuit is connected to the controlled end of the second switch circuit;

[0028] The second switch circuit is used to open / close the path between the communication interface and the communication module according to the temperature detection signal.

[0029] In one embodiment, the communication interface has a communication ground terminal, the communication ground terminal is connected to a communication resistor, and the communication ground terminal is connected to a first end of the communication resistor;

[0030] The second end of the communication resistor is connected to the input end of the second switch circuit, the output end of the second switch circuit is grounded, and the controlled end of the fourth switch tube is connected to the output end of the second temperature detection circuit.

[0031] In one embodiment, the headphone protection circuit further includes:

[0032] an overvoltage protection circuit, wherein a detection end of the overvoltage protection circuit is connected to the power interface, and an output end of the overvoltage protection circuit is electrically connected to a controlled end of the first switch circuit;

[0033] When the overvoltage protection circuit detects that the voltage of the power interface is greater than an upper voltage threshold, the overvoltage protection circuit controls the first switch circuit to disconnect the path between the power interface and the power output end.

[0034] In one embodiment, the overvoltage protection circuit includes: a first voltage zener diode, a fourth resistor and a fifth resistor; the first end of the fourth resistor is connected to the power interface, the second end of the fourth resistor is electrically connected to the cathode of the first voltage zener diode, and the anode of the first voltage zener diode is grounded; the first end of the fifth resistor is electrically connected to the cathode of the first voltage zener diode, and the second end of the fifth resistor is connected to the controlled end of the first switching circuit.

[0035] In one embodiment, the headphone protection circuit further includes:

[0036] A first voltage detection circuit, wherein a detection end of the first voltage detection circuit is connected to the power interface, and an output end of the first voltage detection circuit is electrically connected to the main control circuit;

[0037] The first voltage detection circuit is used to detect the voltage of the power interface and output a corresponding first voltage detection signal;

[0038] a second voltage detection circuit, wherein a detection end of the second voltage detection circuit is connected to the power output end, and an output end of the second voltage detection circuit is electrically connected to the main control circuit;

[0039] The second voltage detection circuit is used to detect the voltage at the power output terminal and output a corresponding second voltage detection signal;

[0040] The main control circuit is used to control the first switch circuit to disconnect the path between the power interface and the power output end when it is determined according to the first voltage detection signal that the voltage of the power interface is less than a first lower voltage threshold, or when it is determined according to the second voltage detection signal that the voltage of the power output end is less than a second lower voltage threshold.

[0041] The present application also proposes a headphone protection method, which is applied to the headphone protection circuit described in any one of the above items, and the method comprises:

[0042] Obtaining the temperature of the power interface;

[0043] When the temperature of the power interface is greater than a first preset temperature threshold, the first switch circuit is controlled to disconnect the path between the power interface and the power output end.

[0044] In one embodiment, before obtaining the temperature of the power interface, the method further includes:

[0045] Obtaining the voltage of the power interface;

[0046] When the voltage of the power interface is greater than an upper voltage threshold, the first switch circuit is controlled to disconnect the path between the power interface and the power output terminal.

[0047] The present application also provides a headset, comprising a power interface for connecting to a power line, a power output terminal for connecting to a subsequent circuit, and a headset protection circuit as described in any one of the above items;

[0048] And / or, the headset runs any one of the above-mentioned methods for protecting the headset.

[0049] In one embodiment, when the headset includes a communication interface, the communication interface and the power interface are integrated into the same device interface.

[0050] The technical solution of the present application includes a first temperature detection circuit for detecting the temperature of the power interface of the headphones and outputting a corresponding first temperature detection signal; a first switch circuit, which is arranged in series in the path between the power interface and the power output terminal; and a main control circuit, which is used to control the first switch circuit to disconnect the path between the power interface and the power output terminal when it is determined that the temperature of the headphones is greater than a first preset temperature according to the first temperature detection signal. With such an arrangement, in actual applications, when a user uses headphones and connects a power cord to the power interface of the headphones, causing the temperature of the headphones to rise to a first preset temperature threshold, the protection circuit of the headphones of the present application controls the path between the power interface and the power output terminal to be disconnected to stop the power supply to the headphones, thereby avoiding safety hazards such as user burns or damage to the subsequent circuits due to further increase in the temperature of the headphones. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0052] Figure 1 This is a schematic diagram of a module according to an embodiment of the present application;

[0053] Figure 2 This is a module schematic diagram of another embodiment of the present application;

[0054] Figure 3 This is a schematic diagram of the circuit structure of another embodiment of the present application;

[0055] Figure 4 This is a schematic diagram of the circuit structure of an embodiment of the present application;

[0056] Figure 5 This is a module schematic diagram of yet another embodiment of the present application;

[0057] Figure 6 This is a schematic diagram of the circuit structure of yet another embodiment of the present application;

[0058] Figure 7 This is a module schematic diagram of another embodiment of the present application;

[0059] Figure 8 This is a schematic diagram of the circuit structure of another embodiment of the present application;

[0060] Fig. 9 This is a module schematic diagram of another embodiment of the present application;

[0061] Fig.10 This is a schematic diagram of a circuit structure of another embodiment of the present application;

[0062] Fig.11 This is a module schematic diagram of yet another embodiment of the present application;

[0063] Fig.12 This is a schematic diagram of the circuit structure of yet another embodiment of the present application;

[0064] Fig.13 This is a flow chart of an embodiment of the present application;

[0065] Fig.14 This is a flow chart of another embodiment of the present application.

[0066] Description of Figure Numbers:

[0067] 10. First temperature detection circuit; 20. First switch circuit; 21. Main switch circuit; 22. Drive circuit; 30. Main control circuit; 31. Controller; 40. Communication interface; 50. Second switch circuit; 60. Second temperature detection circuit; 70. Overvoltage protection circuit; 80. First voltage detection circuit; 90. Second voltage detection circuit; 100. Reference voltage source.

[0068] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0070] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0071] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0072] With the rise of the concept of the metaverse, various types of headphones have emerged one after another. In order to reduce the weight of the product and improve the experience of wearing headphones, most existing headphones use batteries with smaller capacity to reduce the weight of the headphones. However, due to the small battery capacity, users cannot use the headphones for a long time.

[0073] In order to extend the use time of headphones, many consumers choose to plug the power cord into the headphones while using them. Although this can extend the use time to a certain extent, it undoubtedly increases the possibility of overheating of the headphones. Overheated headphones can not only easily burn consumers, but also damage the internal circuits of the headphones, and even cause explosions, posing certain safety hazards.

[0074] To this end, in one embodiment of the present application, refer to Figure 1 The headset includes a power interface and a power output terminal, and the protection circuit of the headset includes:

[0075] A first temperature detection circuit 10, the first temperature detection circuit 10 is used to detect the temperature of the power interface and output a corresponding first temperature detection signal;

[0076] A first switch circuit 20, the first switch circuit 20 is arranged in series in a path between the power interface and the power output end;

[0077] A main control circuit 30, wherein the main control circuit 30 is electrically connected to a controlled end of the first switch circuit 20 and an output end of the first temperature detection circuit 10 respectively;

[0078] The main control circuit 30 is used to control the first switch circuit 20 to disconnect the path between the power interface and the power output end when it is determined that the temperature of the power interface is greater than a first preset temperature threshold according to the first temperature detection signal.

[0079] In this embodiment, optionally, the first temperature detection circuit 10 can be implemented by a temperature sensor, such as a semiconductor temperature sensor or an infrared temperature sensor. The temperature sensor measures the temperature of the power interface by directly contacting the power interface, or indirectly measures the temperature of the power interface through a thermal conductive sheet or a heat sink, and converts the temperature signal into an electrical signal, and the main control circuit 30 determines the temperature of the power interface according to the electrical signal.

[0080] Optionally, the first temperature detection circuit 10 can also be implemented by a thermistor. The thermistor can detect the temperature of the power interface by attaching it to the housing of the power interface, or the thermistor can be connected to the power interface through a thermally conductive material (such as thermally conductive silicone, thermally conductive sheet, etc.), thereby indirectly detecting the temperature of the power interface. Since the resistance of the thermistor changes with the temperature, the main control circuit 30 determines the temperature of the power interface by detecting the voltage or resistance of the thermistor. For example, refer to Fig.11 The first temperature detection circuit 10 includes: a thermistor Rt1 and a third resistor R3, wherein the first end of the third resistor R3 is connected to a reference voltage, the second end of the third resistor R3 is connected to the first end of the thermistor Rt1, and the second end of the thermistor Rt1 is grounded; the main control circuit 30 is electrically connected to the first end of the thermistor Rt1. The main control circuit 30 determines the temperature of the power interface by detecting the voltage of the thermistor Rt1. When the voltage of the thermistor Rt1 is less than a preset voltage value, it is determined that the temperature of the power interface is greater than a first preset temperature threshold.

[0081] Since the temperature of the subsequent circuit will continue to rise when the headphones are working and charging, the first temperature detection circuit 10 can also detect the temperature of the subsequent circuit. When the temperature of the subsequent circuit is greater than the maximum operating temperature of the subsequent circuit, the main control circuit 30 controls the first switch circuit 20 to disconnect the path between the power interface and the power output end to avoid damage to the subsequent circuit due to its own excessive temperature.

[0082] In this embodiment, the first preset temperature threshold should be set to a threshold value lower than the lowest temperature that can cause damage to skin tissue, so as to ensure that before the temperature reaches a potentially dangerous level, the protection circuit of the headphones of the present application can stop supplying power to the headphones to stop the temperature of the headphones from further increasing, thereby protecting the user's skin from harm.

[0083] Furthermore, since the headphones are still in operation after the power supply to the headphones is stopped, their temperature may continue to rise or remain unchanged. Therefore, when the temperature of the power interface reaches the second preset temperature threshold, or remains near the first preset temperature threshold, the main control circuit 30 controls the path between the battery in the headphones and the subsequent circuit to be disconnected, thereby controlling the headphones to stop working, ensuring that the subsequent circuit will not be damaged due to overheating, and further protecting the safety of the user. The second preset temperature threshold is greater than the first preset temperature threshold.

[0084] In this embodiment, the main control circuit 30 can be implemented by a main controller, such as MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc.

[0085] In this embodiment, the first switch circuit 20 is implemented by at least one switch tube such as a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc., and / or a switch device such as a contactor, a circuit breaker or a relay.

[0086] The technical solution of the present application includes a first temperature detection circuit 10, which is used to detect the temperature of the power interface of the headphones and output a corresponding first temperature detection signal; a first switch circuit 20, which is arranged in series in the path between the power interface and the power output end; and a main control circuit 30, which is used to control the first switch circuit 20 to disconnect the path between the power interface and the power output end when it is determined that the temperature of the headphones is greater than the first preset temperature according to the first temperature detection signal. With such a configuration, in actual applications, when the user uses the headphones and connects the power cable to the power interface of the headphones, causing the temperature of the headphones to rise to the first preset temperature threshold, the protection circuit of the headphones of the present application controls the path between the power interface and the power output end to be disconnected to stop the power supply to the headphones, thereby avoiding safety hazards such as user burns or damage to the subsequent circuits due to further increase in the temperature of the headphones.

[0087] In one embodiment of the present application, reference Figure 2 , the first switch circuit 20 includes:

[0088] A main switch circuit 21, wherein an input end of the main switch circuit 21 is connected to the power interface, and an output end of the main switch circuit 21 is connected to the power output end;

[0089] The driving circuit 22 is electrically connected to the main control circuit 30 and the controlled end of the main switch circuit 21 respectively.

[0090] In this embodiment, the main switch circuit 21 is implemented by at least one switch tube such as a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc., and / or a switch device such as a contactor, a circuit breaker or a relay.

[0091] In this embodiment, the drive circuit 22 is used to drive the main switch circuit 21 to turn on / off when receiving the control signal of the main control circuit 30. Optionally, the drive circuit 22 can adopt an isolated drive circuit, which includes devices with electrical isolation functions such as optocouplers, transformers, capacitors, etc., and can achieve effective signal transmission while ensuring circuit safety. Optionally, the drive circuit 22 can also adopt a direct drive circuit, which is composed of single electronic components (such as diodes, transistors, resistors, capacitors, etc.) connected together. For example, refer to Figure 3 The main switch circuit 21 includes a first switch tube Q1, the input end of the first switch tube Q1 is connected to the power interface, and the output end of the first switch tube Q1 is connected to the power output end;

[0092] The driving circuit 22 includes: a second switch tube Q2 and a first resistor R1; the controlled end of the second switch tube Q2 is electrically connected to the main control circuit 30, the input end of the second switch tube Q2 is connected to the power interface, the output end of the second switch tube Q2 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is grounded; the controlled end of the first switch tube Q1 is connected to the first end of the first resistor R1.

[0093] The first switch tube Q1 is a PMOS tube, and the second switch tube Q2 is a PNP transistor. When the main control circuit 30 determines that the temperature of the power interface is greater than the first preset temperature threshold according to the first temperature detection signal, the base voltage of the second switch tube Q2 is pulled down to turn on the second switch tube Q2, and the current of the power interface flows through the first resistor R1 through the second switch tube Q2 to increase the gate voltage of the first switch tube Q1, so that the first switch tube Q1 is turned off, thereby cutting off the path between the power interface and the power output end.

[0094] Based on the above embodiment that the first switch circuit 20 includes a main switch circuit 21 and a drive circuit 22, in one embodiment of the present application, refer to Figure 4 , the main control circuit 30 comprises:

[0095] Controller 31;

[0096] A third switch tube Q3 and a second resistor R2, wherein a first end of the second resistor R2 is connected to a controlled end of the drive circuit 22, a second end of the second resistor R2 is connected to an input end of the third switch tube Q3, an output end of the third switch tube Q3 is grounded, and a controlled end of the third switch tube Q3 is electrically connected to the controller 31.

[0097] In this embodiment, the controller 31 can be implemented by, for example, MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc.

[0098] In this embodiment, the third switch tube Q3 is an NMOS tube. When the main control circuit 30 determines that the temperature of the power interface is greater than the first preset temperature threshold according to the first temperature detection signal, the high-level signal is output to control the third switch tube Q3 to be turned on, thereby lowering the voltage of the controlled terminal of the drive circuit 22, so that the drive circuit 22 drives the main switch circuit 21 to disconnect the path between the power interface and the power output terminal. Based on the specific circuit of the above-mentioned first switch circuit 20, the first end of the second resistor R2 is connected to the controlled end of the second switch tube Q2. When the third switch tube Q3 is turned on, the base voltage of the second switch tube Q2 is pulled down, and the second switch tube Q2 is turned on, thereby raising the gate voltage of the first switch tube Q1, so that the first switch tube Q1 disconnects the path between the power interface and the power output terminal.

[0099] Since the transmission of files that occupy a large amount of memory requires more time and power consumption, when the communication module of the headset receives files that occupy a large amount of memory transmitted from the outside through the communication line, the temperature of the communication module will continue to rise. When the temperature of the communication module is too high, it will affect the surrounding circuits.

[0100] To this end, in one embodiment of the present application, refer to Figure 5 and Figure 6 The headset includes a communication interface 40 and a communication module electrically connected to the communication interface 40, wherein the communication interface 40 is used to access a communication line; the protection circuit of the headset includes:

[0101] A second switch circuit 50, the second switch circuit 50 is arranged in series in a path between the communication module and the communication interface 40;

[0102] A second temperature detection circuit 60, the second temperature detection circuit 60 is used to detect the temperature of the communication module and output a corresponding second temperature detection signal;

[0103] The output end of the second temperature detection circuit 60 is connected to the controlled end of the second switch circuit 50; the second switch circuit 50 is used to turn on / off the path between the communication interface 40 and the communication module 50 according to the temperature detection signal.

[0104] It can be understood that the circuit structure of the second temperature detection circuit 60 is the same as the circuit structure of the first temperature detection circuit 10 , and will not be described in detail herein.

[0105] In this embodiment, the communication interface 40 establishes a communication connection with an external terminal through a communication line to receive file data transmitted by the external terminal. When the second temperature detection circuit 60 detects that the temperature of the communication module is greater than a preset temperature threshold, the voltage of the second temperature detection signal is less than the conduction voltage of the second switch circuit 50, so that the second switch circuit 50 disconnects the electrical connection between the communication module and the communication interface 40, thereby controlling the communication module to stop working, and preventing the temperature of the communication module from further rising and causing the surrounding circuits to be affected.

[0106] In another embodiment, reference Figure 6 , the communication interface 40 has a communication ground terminal, the communication ground terminal is connected with a communication resistor Rc, the communication ground terminal is connected to the first end of the communication resistor 40, the second end of the communication resistor 40 is connected to the input end of the second switch circuit 50, and the output end of the second switch circuit 50 is grounded. When the communication resistor Rc is grounded, the loop between the communication interface 40 and the communication module can be turned on, thereby stabilizing the transmission of data. When the communication resistor Rc is not grounded, the loop between the communication interface 40 and the communication module is disconnected, so that the communication module cannot correctly identify the data transmitted by the communication line. Based on the effect of the above-mentioned communication resistor Rc, when the temperature of the communication module is too high, the voltage of the second temperature detection signal is less than the conduction voltage of the second switch circuit 50, so that the second switch circuit 50 disconnects the path between the communication resistor Rc and the ground, so that the communication module cannot identify the data transmitted by the communication line, thereby stopping work, and avoiding the temperature of the communication module from further rising and causing the circuit around it to be affected.

[0107] The second switch circuit 50 is implemented by at least one switch tube such as a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc., and / or a switch device such as a contactor, a circuit breaker or a relay. Figure 6The second switch circuit 50 is a fourth switch tube Q4, and the fourth switch tube Q4 is an NMOS tube. When the second temperature detection circuit 60 is implemented by the thermistor Rt2, if the temperature of the communication module rises and reaches a preset temperature threshold, the voltage of the thermistor Rt2 drops and is lower than the turn-on voltage of the fourth switch tube Q4, so that the fourth switch tube Q4 disconnects the path between the communication resistor Rc and the ground, thereby controlling the communication module to stop working.

[0108] refer to Figure 7 In one embodiment of the present application, the headphone protection circuit further includes:

[0109] an overvoltage protection circuit 70, wherein a detection end of the overvoltage protection circuit 70 is connected to the power interface, and an output end of the overvoltage protection circuit 70 is electrically connected to a controlled end of the first switch circuit 20;

[0110] When the overvoltage protection circuit 70 detects that the voltage of the power interface is greater than the upper voltage threshold, it controls the first switch circuit 20 to disconnect the path between the power interface and the power output terminal. The overvoltage protection circuit 70 can prevent excessive voltage from entering the device, thereby preventing excessive voltage from damaging the subsequent circuit.

[0111] In this embodiment, optionally, the overvoltage protection circuit 70 can be implemented by using a comparator and a voltage divider circuit, the voltage divider circuit divides the voltage of the power interface, one input end of the comparator collects the voltage of the voltage divider circuit, and the other input end is connected to the reference voltage. When the voltage of the power interface is greater than the upper voltage threshold, the voltage of the voltage divider circuit is greater than the reference voltage, so that the comparator outputs a high / low level signal to control the first switch circuit 20 to turn off. For example, based on the specific circuit embodiment of the first switch circuit 20 described above, when the comparator outputs a low level to the second switch tube Q2, the second switch tube Q2 is turned on to pull up the voltage of the controlled terminal of the first switch tube Q1, and the first switch tube Q1 disconnects the path between the power interface and the power output terminal.

[0112] Optionally, the overvoltage protection circuit 70 may also be implemented using a voltage stabilizing diode and a voltage divider circuit, for example, referring to Figure 8, the overvoltage protection circuit 70 includes: a first voltage stabilizing diode D1, a fourth resistor R4 and a fifth resistor R5, wherein the first end of the fourth resistor R4 is connected to the power interface, the second end of the fourth resistor R4 is electrically connected to the cathode of the first voltage stabilizing diode D1, and the anode of the first voltage stabilizing diode D1 is grounded; the first end of the fifth resistor R5 is electrically connected to the cathode of the first voltage stabilizing diode D1, and the second end of the fifth resistor R5 is connected to the controlled end of the first switch circuit 20. The fourth resistor R4 and the fifth resistor R5 play a voltage dividing role. When the voltage of the power interface is less than the upper voltage threshold, the first voltage stabilizing diode D1 is not broken down, the voltage of the first switch circuit 20 is equal to the voltage of the power interface, and the first switch circuit 20 is in a conducting state at this time. When the voltage of the power interface is greater than the preset voltage value, the first voltage stabilizing diode D1 is broken down, so that the voltage of the controlled end of the first switch circuit 20 is reduced from the voltage of the power interface to the clamping voltage of the first voltage stabilizing diode D1, so that the first switch circuit 20 is turned off.

[0113] Based on the specific circuit of the first switch circuit 20, reference is made to Figure 8 The second end of the fifth resistor R5 is connected to the controlled end of the second switch tube Q2. When the first voltage stabilizing diode D1 is broken down, the base voltage of the second switch tube Q2 is pulled down to the clamping voltage of the first voltage stabilizing diode D1, so that the second switch tube Q2 is turned on. When the second switch tube Q2 is turned on, the first switch tube Q1 disconnects the path between the power interface and the power output end.

[0114] It can be understood that when the protection circuit of the headphones of the present application includes both the first temperature detection circuit 10 and the overvoltage protection circuit 70, optionally, the main control circuit 30 can first judge the temperature of the power interface, and then judge the voltage of the power interface; optionally, the main control circuit 30 can also first judge the voltage of the power interface, and then judge the temperature of the power interface; optionally, the main control circuit 30 can also judge the temperature of the power interface and the voltage of the power interface at the same time, which is not limited here.

[0115] refer to Fig. 9 In one embodiment of the present application, the headphone protection circuit further includes:

[0116] A first voltage detection circuit 80, wherein a detection end of the first voltage detection circuit 80 is connected to the power interface, and an output end of the first voltage detection circuit 80 is electrically connected to the main control circuit 30;

[0117] The first voltage detection circuit 80 is used to detect the voltage of the power interface and output a corresponding first voltage detection signal;

[0118] A second voltage detection circuit 90, wherein a detection end of the second voltage detection circuit 90 is connected to the power output end, and an output end of the second voltage detection circuit 90 is electrically connected to the main control circuit 30;

[0119] The second voltage detection circuit 90 is used to detect the voltage at the output end of the power supply and output a corresponding second voltage detection signal;

[0120] The main control circuit 30 is used to control the first switch circuit 20 to disconnect the path between the power interface and the power output end when it is determined according to the first voltage detection signal that the voltage of the power interface is less than a first lower voltage threshold, or when it is determined according to the second voltage detection signal that the voltage of the power output end is less than a second lower voltage threshold.

[0121] With such a configuration, when the power supply connected to the power interface is low, so that the voltage of the power interface or the voltage of the power output end is undervoltage, the main control circuit 30 controls the first switch circuit 20 to disconnect the path between the power interface and the power output end, to prevent damage to the subsequent circuit or performance degradation due to excessively low voltage.

[0122] In this embodiment, optionally, the first voltage detection circuit 80 and the second voltage detection circuit 90 can be implemented by using a Hall voltage sensor, a voltage transformer or a resistive voltage sensor, and transmit the corresponding first voltage detection signal or the second voltage detection signal by directly or indirectly detecting the voltage of the power interface and the voltage of the power output terminal. Optionally, the first voltage detection circuit 80 and the second voltage detection circuit 90 can also be implemented by a voltage divider circuit composed of multiple resistors. For example, refer to Fig.10 , the first voltage detection circuit 80 includes:

[0123] a sixth resistor R6 and a seventh resistor R7, wherein a first end of the sixth resistor R6 is connected to the power interface, a second end of the sixth resistor R6 is connected to a first end of the seventh resistor R7, and a second end of the seventh resistor R7 is grounded; and the main control circuit 30 is electrically connected to a first end of the seventh resistor R7;

[0124] The second voltage detection circuit 90 includes:

[0125] An eighth resistor R8 and a ninth resistor R9, wherein the first end of the eighth resistor R8 is connected to the power output end, the second end of the eighth resistor R8 is connected to the first end of the ninth resistor R9, and the second end of the ninth resistor R9 is grounded; and the main control circuit 30 is electrically connected to the first end of the ninth resistor R9.

[0126] The voltage divider circuit composed of the sixth resistor R6 and the seventh resistor R7 is used to collect the voltage of the power interface. When the main control circuit 30 detects that the voltage of the seventh resistor R7 drops to a set value, it indicates that the voltage of the power interface drops to a first lower voltage threshold, and the main control circuit 30 controls the first switch circuit 20 to disconnect the path between the power interface and the power output end; the voltage divider circuit composed of the eighth resistor R8 and the ninth resistor R9 is used to collect the voltage of the power output end. When the main control circuit 30 detects that the voltage of the ninth resistor R9 drops to a set value, it indicates that the voltage of the power output end has dropped to a second lower voltage threshold, and the main control circuit 30 controls the first switch circuit 20 to disconnect the path between the power interface and the power output end.

[0127] refer to Fig.12 In one embodiment of the present application, the headphone protection circuit further includes:

[0128] A reference voltage source 100, wherein an output end of the reference voltage source 100 is connected to a first power supply end in a protection circuit of the headphone.

[0129] In this embodiment, the first power supply end can be the first end of the third resistor R3 in the above embodiment, and the reference voltage source 100 is used to provide a constant reference voltage for the thermistor Rt1 to improve the accuracy of temperature detection; the first power supply end can also be one of the input ends of the comparator of the above-mentioned overvoltage protection circuit embodiment, and the reference voltage source 100 provides a stable reference voltage for the comparator to improve the accuracy of overvoltage protection.

[0130] In this embodiment, the reference voltage source 100 can be implemented using a reference voltage source circuit or a linear voltage regulator circuit. The input end of the reference voltage source 100 is connected to a power interface or a power output end to convert the voltage of the power interface or the power output end into a stable voltage and output it to the first power end.

[0131] refer to Fig.13 The present application also proposes a headphone protection method, which is applied to the headphone protection circuit mentioned above, and the method comprises:

[0132] Step S100: obtaining the temperature of the power interface;

[0133] Step S200: When the temperature of the power interface is greater than a first preset temperature threshold, control the first switch circuit 20 to disconnect the path between the power interface and the power output end.

[0134] In this embodiment, optionally, the present application can obtain the temperature of the power interface through a temperature detection circuit composed of a thermistor, the resistance of the thermistor changes with the temperature, and the temperature of the power interface is determined by detecting the voltage or resistance of the thermistor. Fig.11 The temperature detection circuit includes: a thermistor Rt1 and a third resistor R3, the first end of the third resistor R3 is connected to a reference voltage, the second end of the third resistor R3 is connected to the first end of the thermistor Rt1, and the second end of the thermistor Rt1 is grounded. When the voltage of the thermistor Rt1 is less than a preset voltage value, the main control circuit 30 determines that the temperature of the power interface is greater than a first preset temperature threshold. Optionally, the present application may also use a temperature sensor to obtain the temperature of the power interface, such as a semiconductor temperature sensor or an infrared temperature sensor, and the temperature of the power interface may be determined based on a temperature detection signal output by the temperature sensor.

[0135] In this embodiment, since the headphones are still in working state after the power supply to the headphones is stopped, their temperature may continue to rise or remain unchanged. Therefore, when the temperature of the power interface reaches the second preset temperature threshold, or is maintained near the first preset temperature threshold, the headphone protection method of the present application controls the path between the battery in the headphones and the subsequent circuit to be disconnected, thereby controlling the headphones to stop working, ensuring that the subsequent circuit will not be damaged due to overheating, and further protecting the safety of the user. Among them, the second preset temperature threshold is greater than the first preset temperature threshold.

[0136] It should be noted that the first preset temperature threshold should be set to a threshold lower than the lowest temperature that can cause damage to skin tissue, so as to ensure that before the temperature reaches a potentially dangerous level, the protection method of the headphones in the present application can stop supplying power to the headphones to stop the temperature of the headphones from further increasing, thereby protecting the user's skin from harm.

[0137] The headphone protection method of the present application includes obtaining the temperature of the power interface, and when the temperature of the power interface is greater than a first preset temperature threshold, disconnecting the path between the power interface and the subsequent circuit. With such a configuration, in actual application, when a user uses the headphone and simultaneously connects a power line to the power interface of the headphone, causing the temperature of the headphone to rise to the first preset temperature threshold, the headphone protection method of the present application disconnects the path between the power interface and the power output end to stop supplying power to the headphone, thereby avoiding safety hazards such as user burns or subsequent circuit damage caused by further increase in the temperature of the headphone.

[0138] In one embodiment of the present application, reference Fig.14 , before obtaining the temperature of the power interface, the method further includes:

[0139] Step S000: obtaining the voltage of the power interface;

[0140] Step S050: When the voltage of the power interface is greater than an upper voltage threshold, control the first switch circuit 20 to disconnect the path between the power interface and the power output end.

[0141] In this embodiment, optionally, the present application can use an overvoltage protection circuit composed of a comparator and a voltage divider circuit to implement the above steps. The voltage divider circuit is used to divide the voltage of the power interface. One input end of the comparator collects the voltage divider value of the voltage divider circuit to obtain the voltage of the power interface. The other input end is connected to the reference voltage. The output end of the comparator is connected to the controlled end of the first switch circuit 20. By reasonably setting the resistance value of the voltage divider circuit, when the voltage of the power interface is greater than the upper voltage threshold, the voltage of the voltage divider circuit is greater than the reference voltage. When the voltage of the voltage divider circuit is greater than the reference voltage, the comparator outputs a high / low level to the controlled end of the first switch circuit 20 to control the first switch circuit 20 to disconnect the path between the power interface and the power output end.

[0142] Optionally, the present application can also use a voltage sensor and a processor to implement the above steps, the detection end of the voltage sensor is electrically connected to the power interface, the output end of the voltage sensor is electrically connected to the processor, and the processor is electrically connected to the controlled end of the first switch circuit 20. The voltage sensor is used to detect the voltage of the power interface and output a corresponding voltage detection signal to the processor. The processor determines the voltage of the power interface according to the voltage detection signal, and controls the first switch circuit 20 to disconnect the path between the power interface and the power output end when the voltage of the power interface is greater than the upper voltage threshold. Among them, the voltage sensor can be implemented by any one of a Hall voltage sensor, a voltage transformer or a voltage divider voltage sensor, and the processor can be the above-mentioned main control circuit 30.

[0143] Optionally, the present application may also implement the above steps using an overvoltage protection circuit consisting of a voltage stabilizing diode and a voltage divider circuit. Figure 8, the overvoltage protection circuit includes: a first voltage zener diode D1, a fourth resistor R4 and a fifth resistor R5, the first end of the fourth resistor R4 is connected to the power interface, the second end of the fourth resistor R4 is electrically connected to the cathode of the first voltage zener diode D1, and the anode of the first voltage zener diode D1 is grounded; the first end of the fifth resistor R5 is electrically connected to the cathode of the first voltage zener diode D1, and the second end of the fifth resistor R5 is connected to the controlled end of the first switch circuit 20, wherein the voltage divider circuit includes the fourth resistor R4 and the fifth resistor R5. When the voltage of the power interface is less than the upper voltage threshold, the first voltage zener diode D1 is not broken down, the voltage of the first switch circuit 20 is equal to the voltage of the power interface, and the first switch circuit 20 is in the on state. When the voltage of the power interface is greater than the preset voltage value, the first voltage zener diode D1 is broken down, so that the voltage of the controlled end of the first switch circuit 20 is reduced from the voltage of the power interface to the clamping voltage of the first voltage zener diode D1, so that the first switch circuit 20 disconnects the path between the power interface and the power output end.

[0144] Based on the specific circuit of the first switch circuit 20, reference is made to Figure 8 The second end of the fifth resistor R5 is connected to the controlled end of the second switch tube Q2. When the first voltage stabilizing diode D1 is broken down, the base voltage of the second switch tube Q2 is pulled down to the clamping voltage of the first voltage stabilizing diode D1, so that the second switch tube Q2 is turned on. When the second switch tube Q2 is turned on, the first switch tube Q1 disconnects the path between the power interface and the power output end.

[0145] Through the above settings, when the protection method of the head-mounted device of the present application determines that the voltage of the power interface is greater than the upper limit voltage threshold, the first switch circuit 20 is controlled to disconnect the path between the power interface and the power output end, thereby preventing irreversible damage to sensitive electronic components in the subsequent circuit due to excessively high input voltage.

[0146] The present application also proposes a headset, comprising a power interface for connecting to a power line, a power output terminal for connecting to a subsequent circuit, and a protection circuit for the headset as described above;

[0147] And / or, the headset runs the above-mentioned headset protection method.

[0148] It is worth noting that since the headphones of the present application are based on the above-mentioned headphone protection circuit and / or the above-mentioned headphone protection method, the embodiments of the headphones of the present application include all technical solutions of all embodiments of the above-mentioned headphone protection circuit and / or the above-mentioned headphone protection method, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0149] In one embodiment of the present application, when the headset includes a communication interface, the communication interface and the power interface are integrated into the same device interface. The device interface can be implemented using a USB Type-C or a DC jack with data pins. This arrangement reduces the number of interfaces on the headset, making the device appearance more concise.

[0150] The above description is only an exemplary implementation of the present application and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A headphone protection circuit, characterized in that: The headset includes a power interface for connecting to a power line and a power output terminal for connecting to a subsequent circuit. The protection circuit of the headset includes: a first temperature detection circuit, the first temperature detection circuit being used to detect the temperature of the power interface and output a corresponding first temperature detection signal; A first switch circuit, the first switch circuit is arranged in series in a path between the power interface and the power output end; a main control circuit, the main control circuit being electrically connected to a controlled end of the first switch circuit and an output end of the first temperature detection circuit respectively; The main control circuit is used to control the first switch circuit to disconnect the path between the power interface and the power output end when it is determined according to the first temperature detection signal that the temperature of the power interface is greater than a first preset temperature threshold.

2. The headphone protection circuit according to claim 1, characterized in that: The first switch circuit comprises: A main switch circuit, wherein an input end of the main switch circuit is connected to the power interface, and an output end of the main switch circuit is connected to the power output end; A driving circuit is electrically connected to the main control circuit and the controlled end of the main switch circuit respectively.

3. The headphone protection circuit according to claim 2, characterized in that: The main switch circuit includes a first switch tube, the input end of the first switch tube is connected to the power interface, and the output end of the first switch tube is connected to the power output end; The driving circuit comprises: A second switch tube and a first resistor; The controlled end of the second switch tube is electrically connected to the main control circuit, the input end of the second switch tube is connected to the power interface, the output end of the second switch tube is connected to the first end of the first resistor, and the second end of the first resistor is grounded; The controlled end of the first switch tube is connected to the first end of the first resistor.

4. The headphone protection circuit according to claim 2, characterized in that: The main control circuit comprises: Controller; A third switch tube and a second resistor, wherein the first end of the second resistor is connected to the controlled end of the drive circuit, the second end of the second resistor is connected to the input end of the third switch tube, the output end of the third switch tube is grounded, and the controlled end of the third switch tube is electrically connected to the controller.

5. The headphone protection circuit according to claim 1, characterized in that: The first temperature detection circuit comprises: A thermistor and a third resistor, wherein a first end of the third resistor is connected to a first voltage, a second end of the third resistor is connected to the first end of the thermistor, and a second end of the thermistor is grounded; The main control circuit is electrically connected to the first end of the thermistor.

6. The headphone protection circuit according to claim 1, characterized in that: The headset comprises a communication interface and a communication module electrically connected to the communication interface, wherein the communication interface is used to access a communication line; The headphone protection circuit comprises: a second switch circuit, the second switch circuit being arranged in series in a path between the communication module and the communication interface; a second temperature detection circuit, the second temperature detection circuit being used to detect the temperature of the communication module and output a corresponding second temperature detection signal; The output end of the second temperature detection circuit is connected to the controlled end of the second switch circuit; The second switch circuit is used to open / close the path between the communication interface and the communication module according to the temperature detection signal.

7. The headphone protection circuit according to claim 6, characterized in that: The communication interface has a communication ground terminal, the communication ground terminal is connected to a communication resistor, and the communication ground terminal is connected to a first end of the communication resistor; The second end of the communication resistor is connected to the input end of the second switch circuit, the output end of the second switch circuit is grounded, and the controlled end of the fourth switch tube is connected to the output end of the second temperature detection circuit.

8. The headphone protection circuit according to any one of claims 1 to 7, characterized in that: The headphone protection circuit also includes: an overvoltage protection circuit, wherein a detection end of the overvoltage protection circuit is connected to the power interface, and an output end of the overvoltage protection circuit is electrically connected to a controlled end of the first switch circuit; When the overvoltage protection circuit detects that the voltage of the power interface is greater than an upper voltage threshold, the overvoltage protection circuit controls the first switch circuit to disconnect the path between the power interface and the power output end.

9. The headphone protection circuit according to claim 8, characterized in that: The overvoltage protection circuit includes: a first voltage zener diode, a fourth resistor and a fifth resistor; the first end of the fourth resistor is connected to the power interface, the second end of the fourth resistor is electrically connected to the cathode of the first voltage zener diode, and the anode of the first voltage zener diode is grounded; the first end of the fifth resistor is electrically connected to the cathode of the first voltage zener diode, and the second end of the fifth resistor is connected to the controlled end of the first switching circuit.

10. The headphone protection circuit according to any one of claims 1 to 7, characterized in that: The headphone protection circuit also includes: A first voltage detection circuit, wherein a detection end of the first voltage detection circuit is connected to the power interface, and an output end of the first voltage detection circuit is electrically connected to the main control circuit; The first voltage detection circuit is used to detect the voltage of the power interface and output a corresponding first voltage detection signal; a second voltage detection circuit, wherein a detection end of the second voltage detection circuit is connected to the power output end, and an output end of the second voltage detection circuit is electrically connected to the main control circuit; The second voltage detection circuit is used to detect the voltage at the power output terminal and output a corresponding second voltage detection signal; The main control circuit is used to control the first switch circuit to disconnect the path between the power interface and the power output terminal when it is determined according to the first voltage detection signal that the voltage of the power interface is less than a first lower voltage threshold, or when it is determined according to the second voltage detection signal that the voltage of the power output terminal is less than a second lower voltage threshold.

11. A method for protecting headphones, applied to the headphone protection circuit according to any one of claims 1 to 10, characterized in that: The method comprises: Obtaining the temperature of the power interface; When the temperature of the power interface is greater than a first preset temperature threshold, the first switch circuit is controlled to disconnect the path between the power interface and the power output end.

12. The headphone protection method according to claim 11, characterized in that: Before obtaining the temperature of the power interface, the method further includes: Obtaining the voltage of the power interface; When the voltage of the power interface is greater than an upper voltage threshold, the first switch circuit is controlled to disconnect the path between the power interface and the power output terminal.

13. A headset, characterized in that: It comprises a power interface for connecting to a power line, a power output terminal for connecting to a subsequent circuit, and a protective circuit for the headset according to any one of claims 1 to 10; And / or, the headset runs the headset protection method according to any one of claims 11 to 12.

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