CN113607297A

CN113607297A - Temperature detection circuit and earphone

Info

Publication number: CN113607297A
Application number: CN202110447442.0A
Authority: CN
Inventors: 郭世文; 余新; 吴海全; 彭久高
Original assignee: Shenzhen Grandsun Electronics Co Ltd
Current assignee: Shenzhen Grandsun Electronics Co Ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2021-11-05
Also published as: WO2022227857A1

Abstract

The application discloses temperature detection circuit and earphone belongs to circuit technical field. The temperature detection circuit comprises a charging and discharging management circuit, a first battery system and a first processing circuit. The first battery system comprises a first energy storage unit and a first temperature-sensitive circuit. When the charging and discharging management circuit is in a charging management state, the charging and discharging management circuit outputs electric energy to the first energy storage unit and the first processing circuit; when the charging and discharging management circuit is in a discharging management state, the first energy storage unit outputs electric energy to the first processing circuit through the charging and discharging management circuit. When the first processing circuit is electrified to work, the resistance value of the first temperature-sensitive circuit is detected, and the temperature of the first energy storage unit is determined according to the resistance value of the first temperature-sensitive circuit. According to the temperature detection circuit, the resistance value of the first temperature-sensitive circuit is detected by the first processing circuit, so that the accuracy of detecting the temperature of the first energy storage unit can be improved.

Description

Temperature detection circuit and earphone

Technical Field

The application relates to the technical field of circuits, in particular to a temperature detection circuit and an earphone.

Background

Bluetooth headsets typically include a charge and discharge management circuit, an energy storage unit, and a load circuit. The charging and discharging management circuit is respectively connected with the energy storage unit and the load circuit. When the charging and discharging management circuit is in the charging management state, the charging and discharging management circuit can output electric energy to the energy storage unit and the load circuit, and when the charging and discharging management circuit is in the discharging management state, the energy storage unit can output electric energy to the load circuit through the charging and discharging management circuit. The load circuit operates when energized.

In the related art, the bluetooth headset is also provided with a temperature-sensitive circuit, and the resistance of the temperature-sensitive circuit changes along with the temperature change of the energy storage unit. One end of the temperature-sensitive circuit is connected with the ground wire, and the other end of the temperature-sensitive circuit is connected with the voltage output end of the charge-discharge management circuit through a resistor. The voltage detection end of the charge and discharge management circuit is connected between the resistor and the temperature-sensitive circuit and used for detecting the voltage of the temperature-sensitive circuit, so that the resistor of the temperature-sensitive circuit is determined according to the voltage of the temperature-sensitive circuit, and the temperature of the energy storage unit is obtained.

However, since the temperature-sensitive circuit is connected to the voltage output terminal of the charge and discharge management circuit through the resistor, when the voltage output from the voltage output terminal of the charge and discharge management circuit changes, the voltage of the temperature-sensitive circuit also changes, which may affect the accuracy of temperature detection of the energy storage unit.

Disclosure of Invention

The application provides a temperature detection circuit and earphone can improve the accuracy of the temperature that detects the energy storage unit. The technical scheme is as follows:

in a first aspect, a temperature detection circuit is provided, including: the charging and discharging management circuit comprises a charging and discharging management circuit, a first battery system and a first processing circuit;

the first battery system comprises a first energy storage unit and a first temperature-sensitive circuit, the first temperature-sensitive circuit is attached to the outer surface of the first energy storage unit, and the resistance of the first temperature-sensitive circuit changes along with the change of the temperature of the first energy storage unit;

the first end of the charge and discharge management circuit is connected with the first energy storage unit, and the second end of the charge and discharge management circuit is connected with the first end of the first processing circuit; when the charging and discharging management circuit is in a charging management state, the charging and discharging management circuit outputs electric energy to the first energy storage unit and the first processing circuit; when the charging and discharging management circuit is in a discharging management state, the first energy storage unit outputs electric energy to the first processing circuit through the charging and discharging management circuit;

the first end of the first temperature-sensitive circuit is connected with a ground wire GND, the second end of the first temperature-sensitive circuit is connected with the second end of the first processing circuit, and when the first processing circuit works, the resistance value of the first temperature-sensitive circuit is detected, and the temperature of the first energy storage unit is determined according to the resistance value of the first temperature-sensitive circuit.

In the present application, the temperature detection circuit includes a charge and discharge management circuit, a first battery system, and a first processing circuit. The first battery system comprises a first energy storage unit and a first temperature-sensitive circuit. When the charging and discharging management circuit is in a charging management state, the charging and discharging management circuit outputs electric energy to the first energy storage unit and the first processing circuit; when the charging and discharging management circuit is in a discharging management state, the first energy storage unit outputs electric energy to the first processing circuit through the charging and discharging management circuit. When the first processing circuit is electrified to work, the resistance value of the first temperature-sensitive circuit is detected, and the temperature of the first energy storage unit is determined according to the resistance value of the first temperature-sensitive circuit. According to the temperature detection circuit, the first processing circuit detects the resistance value of the first temperature-sensitive circuit, and the first temperature-sensitive circuit is not required to be connected with the voltage output end of the charge and discharge management circuit, so that the influence of the change of the voltage output by the voltage output end of the charge and discharge management circuit on the detection of the resistance value of the first temperature-sensitive circuit can be avoided, and the accuracy of detecting the temperature of the first energy storage unit can be improved.

Optionally, the temperature detection circuit further includes: a second battery system and a second processing circuit;

the second battery system comprises a second energy storage unit and a second temperature-sensitive circuit, the second temperature-sensitive circuit is attached to the outer surface of the second energy storage unit, and the resistance of the second temperature-sensitive circuit changes along with the change of the temperature of the second energy storage unit;

the first end of the charge and discharge management circuit is connected with the second energy storage unit, and the second end of the charge and discharge management circuit is connected with the first end of the second processing circuit; when the charging and discharging management circuit is in a charging management state, the charging and discharging management circuit outputs electric energy to the second energy storage unit and the second processing circuit; when the charge and discharge management circuit is in a discharge management state, the second energy storage unit outputs electric energy to the second processing circuit through the charge and discharge management circuit;

the first end of the second temperature-sensitive circuit is connected with the ground wire GND, the second end of the second temperature-sensitive circuit is connected with the second end of the second processing circuit, and when the second processing circuit works, the resistance value of the second temperature-sensitive circuit is detected, and the temperature of the second energy storage unit is determined according to the resistance value of the second temperature-sensitive circuit.

Optionally, the temperature detection circuit further includes: a third temperature sensitive circuit and resistor R1;

the third temperature-sensitive circuit is attached to the outer surface of the charge and discharge management circuit, and the resistance of the third temperature-sensitive circuit changes along with the change of the temperature of the charge and discharge management circuit;

the first end of the third temperature-sensitive circuit is connected with the ground wire GND, and the second end of the third temperature-sensitive circuit is connected with the third end of the first processing circuit;

a first end of the resistor R1 is connected with a second end of the third temperature-sensitive circuit, a second end of the resistor R1 is connected with a third end of the charge and discharge management circuit, and the third end of the charge and discharge management circuit is used for outputting a preset voltage;

and when the first processing circuit works, the temperature of the charge and discharge management circuit is determined according to the ratio of the voltage of the third end of the first processing circuit to the voltage of the fourth end of the first processing circuit.

Optionally, the temperature detection circuit further includes: a first follower circuit;

the first end of the first follower circuit is connected with the second end of the third temperature-sensitive circuit, and the second end of the first follower circuit is connected with the third end of the first processing circuit.

Optionally, the first follower circuit comprises: an operational amplifier A1, a resistor R2 and a resistor R3;

the non-inverting input end of the operational amplifier A1 is connected with the second end of the third temperature-sensitive circuit, the inverting input end of the operational amplifier A1 is connected with the output end of the operational amplifier A1, and the output end of the operational amplifier A1 is connected with the first end of the resistor R2;

the second end of the resistor R2 is connected with the third end of the first processing circuit;

the first end of the resistor R3 is connected with the second end of the resistor R2, and the second end of the resistor R3 is connected with the ground GND.

Optionally, the temperature detection circuit further includes: a second follower circuit;

and the first end of the second follower circuit is connected with the third end of the charge and discharge management circuit, and the second end of the second follower circuit is connected with the fourth end of the first processing circuit.

Optionally, the second follower circuit comprises: an operational amplifier A2, a resistor R4 and a resistor R5;

the non-inverting input end of the operational amplifier A2 is connected with the third end of the charge and discharge management circuit, the inverting input end of the operational amplifier A2 is connected with the output end of the operational amplifier A2, and the output end of the operational amplifier A2 is connected with the first end of the resistor R4;

a second terminal of the resistor R4 is connected to a fourth terminal of the first processing circuit;

the first end of the resistor R5 is connected with the second end of the resistor R4, and the second end of the resistor R5 is connected with the ground GND.

Optionally, the temperature detection circuit further includes: a controller;

the first end of the controller is connected with the fifth end of the first processing circuit so as to input the temperature of the first energy storage unit, and the second end of the controller is connected with the third end of the second processing circuit so as to input the temperature of the second energy storage unit;

and the third end of the controller is connected with the fourth end of the charge and discharge management circuit, so that when at least one of the temperature of the first energy storage unit and the temperature of the second energy storage unit exceeds a temperature threshold, the controller controls the charge and discharge management circuit to be switched off.

Optionally, the temperature detection circuit further includes: a controller;

the first end of the controller is connected with the fifth end of the first processing circuit so as to input the temperature of the first energy storage unit and the temperature of the charge and discharge management circuit;

and the third end of the controller is connected with the fourth end of the charge and discharge management circuit, so that when at least one of the temperature of the first energy storage unit and the temperature of the charge and discharge management circuit exceeds a temperature threshold, the controller controls the charge and discharge management circuit to be disconnected.

In a second aspect, there is provided a headset comprising the temperature detection circuit according to the first aspect.

It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic circuit structure diagram of a bluetooth headset provided in the related art;

fig. 2 is a schematic structural diagram of a first temperature detection circuit provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a second temperature detection circuit provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a third temperature detection circuit provided in the embodiments of the present application;

fig. 5 is a schematic structural diagram of a fourth temperature detection circuit provided in the embodiment of the present application;

fig. 6 is a schematic structural diagram of a fifth temperature detection circuit provided in an embodiment of the present application;

FIG. 7 is a circuit diagram of a first follower circuit and a second follower circuit provided in an embodiment of the present application;

fig. 8 is a schematic structural diagram of a sixth temperature detection circuit provided in the embodiment of the present application.

Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:

the related technology comprises the following steps:

10. a Bluetooth headset;

12. a charge and discharge management circuit;

14. an energy storage unit;

16. a load circuit;

18. a temperature sensitive circuit;

the application:

20. a temperature detection circuit;

210. a charge and discharge management circuit;

212. a charging management circuit;

214. a discharge management circuit;

216. a third temperature sensitive circuit;

220. a first battery system;

222. a first energy storage unit;

224. a first temperature sensitive circuit;

230. a first processing circuit;

240. a second battery system;

242. a second energy storage unit;

244. a second temperature sensitive circuit;

250. a second processing circuit;

262. a first follower circuit;

264. a second follower circuit;

270. and a controller.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that reference to "a plurality" in this application means two or more. In the description of the present application, "/" means "or" unless otherwise stated, for example, a/B may mean a or B; "and/or" herein is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, for the convenience of clearly describing the technical solutions of the present application, the terms "first", "second", and the like are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

Before explaining the embodiments of the present application in detail, an application scenario of the embodiments of the present application will be described.

Fig. 1 is a schematic circuit diagram of a bluetooth headset 10 provided in the related art. Referring to fig. 1, a bluetooth headset 10 generally includes a charge and discharge management circuit 12, an energy storage unit 14, and a load circuit 16. The charge/discharge management circuit 12 is connected to the energy storage unit 14 and the load circuit 16, respectively. When the charge and discharge management circuit 12 is in the charge management state, the charge and discharge management circuit 12 may obtain external power and output the power to the energy storage unit 14 and the load circuit 16. At this time, the energy storage unit 14 is charged. When the charge and discharge management circuit 12 is in the discharge management state, the energy storage unit 14 may output the electric energy to the load circuit 16 through the charge and discharge management circuit 12. At this time, the energy storage unit 14 is discharged. The load circuit 16 may be an operating circuit of the bluetooth headset 10, the load circuit 16 operating when energized.

As shown in fig. 1, in the related art, the bluetooth headset 10 further has a temperature sensitive circuit 18. The temperature-sensitive circuit 18 may be attached to the surface of the energy storage unit 14, so that the resistance of the temperature-sensitive circuit 18 changes with the temperature of the energy storage unit 14. The Temperature-sensitive circuit 18 generally includes an NTC (Negative Temperature Coefficient) Temperature-sensitive resistor, so that the resistance value of the Temperature-sensitive circuit 18 is smaller as the Temperature of the energy storage unit 14 is higher. One end of the temperature sensitive circuit 18 is connected to the ground GND, and the other end is connected to the voltage output terminal REGN of the charge and discharge management circuit 12 through the resistor R. Meanwhile, the voltage detection terminal TS of the charge and discharge management circuit 12 is also connected between the resistor R and the temperature-sensitive circuit 18, so as to detect the voltage of the temperature-sensitive circuit 18. When the charge and discharge management circuit 12 operates, the voltage output terminal REGN of the charge and discharge management circuit 12 outputs a voltage, which is divided by the resistor R and the temperature sensitive circuit 18. When the temperature of the energy storage unit 14 changes, the resistance of the temperature-sensitive circuit 18 changes, and the voltage of the temperature-sensitive circuit 18 changes accordingly. Thus, by detecting the voltage of the temperature-sensitive circuit 18, the resistance of the temperature-sensitive circuit 18 can be determined according to the voltage of the temperature-sensitive circuit 18, and the temperature of the energy storage unit 14 can be obtained.

However, since the temperature-sensitive circuit 18 is connected to the voltage output terminal of the charge and discharge management circuit 12 through a resistor, when the resistor of the temperature-sensitive circuit 18 is not changed, if the voltage output by the voltage output terminal of the charge and discharge management circuit 12 is changed, the voltage of the temperature-sensitive circuit 18 is also changed, which affects the accuracy of temperature detection of the energy storage unit 14.

Therefore, the temperature detection circuit and the earphone are provided in the embodiment of the application, and the accuracy of detecting the temperature of the energy storage unit can be improved.

The temperature detection circuit provided in the embodiments of the present application is explained in detail below. In various embodiments of the present application, the connection between two electrical devices is referred to as an electrical connection. Here, the electrical connection means that two electrical devices are connected by wire or wireless to transmit an electrical signal. The pasting between the temperature-sensitive circuit and other electrical devices means insulation pasting, so that the resistance of the temperature-sensitive circuit changes along with the temperature change of the electrical devices pasted by the temperature-sensitive circuit.

Fig. 2 is a schematic structural diagram of a temperature detection circuit 20 according to an embodiment of the present disclosure, where the temperature detection circuit 20 may be applied to a headset, and the headset may be a headset with a noise reduction function. As shown in fig. 2, the temperature detection circuit 20 includes a charge and discharge management circuit 210, a first battery system 220, and a first processing circuit 230.

The first battery system 220 includes a first energy storage unit 222 and a first temperature sensitive circuit 224. The first energy storage unit 222 is used for storing and releasing electric energy, and may include one or more rechargeable batteries, super capacitors, etc. connected in parallel. The first temperature-sensitive circuit 224 is attached to the outer surface of the first energy storage unit 222 and is connected to the first energy storage unit 222 in an insulating manner. The resistance of the first temperature-sensitive circuit 224 changes with the temperature of the first energy storage unit 222. Generally, as shown in fig. 2, the first temperature-sensitive circuit 224 may include an NTC temperature-sensitive resistor such that the resistance value of the first temperature-sensitive circuit 224 is smaller as the temperature of the first energy storage unit 222 is higher. A first terminal of the first temperature sensitive circuit 224 is connected to the ground GND.

The charging and discharging management circuit 210 is used for performing charging management and discharging management on the first energy storage unit 222. The charging and discharging management circuit 210 may have a power input terminal VDD, and the power input terminal VDD of the charging and discharging management circuit 210 is used for connecting with an external power source to obtain electric energy in the external power source. The charge and discharge management circuit 210 further has a first terminal and a second terminal. A first terminal of the charge and discharge management circuit 210 is connected to the first energy storage unit 222, and a second terminal of the charge and discharge management circuit 210 is connected to a first terminal of the first processing circuit 230. When the charging and discharging management circuit 210 is in the charging management state, the power input terminal VDD of the charging and discharging management circuit 210 is connected to the external power source. At this time, the power input terminal VDD of the charge and discharge management circuit 210 inputs power, the charge and discharge management circuit 210 outputs power to the first energy storage unit 222 and the first processing circuit 230, the first energy storage unit 222 is charged, and the first processing circuit 230 is powered on. When the charging and discharging management circuit 210 is in the discharging management state, the power input terminal VDD of the charging and discharging management circuit 210 is not connected to the external power source. At this time, the first energy storage unit 222 outputs the electric energy to the first processing circuit 230 through the charging and discharging management circuit 210, so that the first processing circuit 230 is powered on to operate.

The first processing circuit 230 also has a second terminal. A second terminal of the first processing circuit 230 is connected to a second terminal of the first temperature sensitive circuit 224. The first processing circuit 230 is operative to detect a resistance value of the first temperature sensitive circuit 224 and determine a temperature of the first energy storage unit 222 according to the resistance value of the first temperature sensitive circuit 224.

When the temperature detection circuit 20 is in operation, if the charging and discharging management circuit 210 is in a charging management state, the charging and discharging management circuit 210 outputs electric energy to the first energy storage unit 222 and the first processing circuit 230. At this time, the first energy storage unit 222 is charged; the first processing circuit 230 is powered on to detect the resistance of the first temperature sensitive circuit 224 and determine the temperature of the first energy storage unit 222. If the charging and discharging management circuit 210 is in the discharging management state, the first energy storage unit 222 outputs the electric energy to the first processing circuit 230 through the charging and discharging management circuit 210. At this time, the first energy storage unit 222 is discharged; the first processing circuit 230 is powered on to detect the resistance of the first temperature sensitive circuit 224 and determine the temperature of the first energy storage unit 222. Thus, the first processing circuit 230 can detect the temperature of the first energy storage unit 222 in the charging state and the temperature in the discharging state. Meanwhile, the first temperature-sensitive circuit 224 does not need to be connected to the voltage output terminal of the charge and discharge management circuit 210, so that the influence of the change of the voltage output by the voltage output terminal of the charge and discharge management circuit 210 on the detection of the resistance value of the first temperature-sensitive circuit 224 can be avoided, and the accuracy of detecting the temperature of the first energy storage unit 222 can be improved.

In some embodiments, still as shown in fig. 2, the first energy storage unit 222 includes a positive electrode and a negative electrode. The positive electrode of the first energy storage unit 222 is connected to the first end of the charge and discharge management circuit 210, and the negative electrode of the first energy storage unit 222 is connected to the ground GND. When the power input terminal VDD of the charge and discharge management circuit 210 is connected to the external power source, the voltage of the first terminal of the charge and discharge management circuit 210 is higher than the voltage of the anode of the first energy storage unit 222, and at this time, the charge and discharge management circuit 210 charges the first energy storage unit 222. When the power input terminal VDD of the charge and discharge management circuit 210 is not connected to the external power source, the voltage of the first terminal of the charge and discharge management circuit 210 is lower than the voltage of the anode of the first energy storage unit 222, and at this time, the first energy storage unit 222 discharges to the first processing circuit 230 through the charge and discharge management circuit 210. The first processing circuit 230 may also have a positive pole and a negative pole. The positive electrode of the first processing circuit 230 constitutes a first terminal of the first processing circuit 230, and is connected to a second terminal of the charge and discharge management circuit 210. The negative terminal of the first processing circuit 230 is connected to the ground GND.

In general, the first processing circuit 230 may include a first processor and a first memory connected with the first processor. When the first processing circuit 230 is operating, the first processor may output a voltage to the first temperature-sensitive circuit 224, and detect the magnitude of the voltage and the magnitude of the current in the first temperature-sensitive circuit 224, so as to determine the resistance value of the first temperature-sensitive circuit 224 according to the voltage and the current. The first memory may store a corresponding relationship between the resistance value of the first temperature-sensitive circuit 224 and the temperature of the first energy storage unit 222, so that after the processor determines the resistance value of the first temperature-sensitive circuit 224, the temperature of the first energy storage unit 222 may be determined according to the corresponding relationship between the resistance value of the first temperature-sensitive circuit 224 and the temperature of the first energy storage unit 222.

Fig. 3 is a schematic structural diagram of another temperature detection circuit 20 according to an embodiment of the present disclosure. As shown in fig. 3, the temperature detection circuit 20 may further include a second battery system 240 and a second processing circuit 250.

The second battery system 240 includes a second energy storage unit 242 and a second temperature sensitive circuit 244. The second energy storage unit 242 is also used for storing and releasing electric energy, and may include one or more parallel rechargeable batteries, super capacitors, and the like. The second temperature-sensitive circuit 244 is attached to the outer surface of the second energy storage unit 242 and is connected to the second energy storage unit 242 in an insulated manner. The resistance of the second temperature sensitive circuit 244 varies with the temperature of the second energy storage unit 242. Generally, as shown in FIG. 3, the second temperature sensitive circuit 244 may include an NTC temperature sensitive resistor such that the resistance value of the second temperature sensitive circuit 244 is smaller as the temperature of the second energy storage unit 242 is higher. A first terminal of the second temperature sensitive circuit 244 is connected to the ground GND.

A first terminal of the charge and discharge management circuit 210 is connected to the second energy storage unit 242, and a second terminal of the charge and discharge management circuit 210 is connected to a first terminal of the second processing circuit 250. When the charging and discharging management circuit 210 is in the charging management state, the power input terminal VDD of the charging and discharging management circuit 210 is connected to the external power source. At this time, the power input terminal VDD of the charge and discharge management circuit 210 inputs power, the charge and discharge management circuit 210 outputs power to the second energy storage unit 242 and the second processing circuit 250, the second energy storage unit 242 charges, and the second processing circuit 250 operates in an energized state. When the charging and discharging management circuit 210 is in the discharging management state, the power input terminal VDD of the charging and discharging management circuit 210 is not connected to the external power source. At this time, the second energy storage unit 242 outputs the electric energy to the second processing circuit 250 through the charging and discharging management circuit 210, so that the second processing circuit 250 is powered on to operate. In the embodiment shown in fig. 2, a first terminal of the charge and discharge management circuit 210 is connected to the first energy storage unit 222 and the second energy storage unit 242, and a second terminal of the charge and discharge management circuit 210 is connected to a first terminal of the first processing circuit 230 and a first terminal of the second processing circuit 250. Therefore, when the charging and discharging management circuit 210 is in the charging management state, the first energy storage unit 222 and the second energy storage unit 242 are charged simultaneously; when the charge and discharge management circuit 210 is in the discharge management state, the first energy storage unit 222 and the second energy storage unit 242 output electric energy to the first processing circuit 230 and the second processing circuit 250 simultaneously.

The second processing circuit 250 also has a second terminal. A second terminal of the second processing circuit 250 is connected to a second terminal of the second temperature sensitive circuit 244. The second processing circuit 250 is operative to detect a resistance value of the second temperature sensitive circuit 244 and determine a temperature of the second energy storage element 242 based on the resistance value of the second temperature sensitive circuit 244.

When the temperature detection circuit 20 is in operation, if the charge and discharge management circuit 210 is in the charge management state, the charge and discharge management circuit 210 outputs electric energy to the second energy storage unit 242 and the second processing circuit 250. At this time, the second energy storage unit 242 is charged; the second processing circuit 250 is powered on to detect the resistance of the second temperature sensitive circuit 244 and determine the temperature of the second energy storage unit 242. If the charging and discharging management circuit 210 is in the discharging management state, the second energy storage unit 242 outputs the electric energy to the second processing circuit 250 through the charging and discharging management circuit 210. At this time, the second energy storage unit 242 is discharged; the second processing circuit 250 is powered on to detect the resistance of the second temperature sensitive circuit 244 and determine the temperature of the second energy storage unit 242. The second processing circuit 250 can detect the temperature of the second energy storage unit 242 in the charging state and the temperature of the discharging state. Meanwhile, the second temperature-sensitive circuit 244 does not need to be connected to the voltage output terminal of the charge and discharge management circuit 210, so that the influence of the change of the voltage output by the voltage output terminal of the charge and discharge management circuit 210 on the detection of the resistance value of the second temperature-sensitive circuit 244 can be avoided, and the accuracy of detecting the temperature of the second energy storage unit 242 can be improved. In this way, the temperature detection circuit 20 has two battery systems, and can perform temperature detection of charging and discharging with respect to the first energy storage unit 222 and the second energy storage unit 242, so that the safety of an electrical appliance to which the temperature detection circuit 20 is applied can be improved.

In some embodiments, as also shown in fig. 3, the second energy storage unit 242 includes a positive electrode and a negative electrode. The anode of the second energy storage unit 242 is connected to the first end of the charge and discharge management circuit 210, and the cathode of the second energy storage unit 242 is connected to the ground GND. When the power input terminal VDD of the charge and discharge management circuit 210 is connected to the external power source, the voltage of the first terminal of the charge and discharge management circuit 210 is higher than the voltage of the anode of the second energy storage unit 242, and at this time, the charge and discharge management circuit 210 charges the second energy storage unit 242. When the power input terminal VDD of the charge and discharge management circuit 210 is not connected to the external power source, the voltage of the first terminal of the charge and discharge management circuit 210 is lower than the voltage of the anode of the second energy storage unit 242, and at this time, the second energy storage unit 242 discharges to the second processing circuit 250 through the charge and discharge management circuit 210. The second processing circuit 250 may also have a positive pole and a negative pole. The positive electrode of the second processing circuit 250 constitutes a first terminal of the second processing circuit 250, and is connected to a second terminal of the charge/discharge management circuit 210. The negative pole of the second processing circuit 250 is connected to the ground GND.

In general, the second processing circuit 250 may include a second processor and a second memory connected with the second processor. When the second processing circuit 250 is operating, the second processor may output a voltage to the second temperature-sensitive circuit 244, and detect the magnitude of the voltage and the magnitude of the current in the second temperature-sensitive circuit 244, so as to determine the resistance value of the second temperature-sensitive circuit 244 according to the voltage and the current. The second memory may store a corresponding relationship between the resistance value of the second temperature-sensitive circuit 244 and the temperature of the second energy storage unit 242, so that after the processor determines the resistance value of the second temperature-sensitive circuit 244, the temperature of the second energy storage unit 242 may be determined according to the corresponding relationship between the resistance value of the second temperature-sensitive circuit 244 and the temperature of the second energy storage unit 242.

Fig. 4 is a schematic structural diagram of another temperature detection circuit 20 provided in the embodiment of the present application. As shown in fig. 4, the charge and discharge management circuit 210 includes a charge management circuit 212 and a discharge management circuit 214.

The charge management circuit 212 has a first terminal, a second terminal, and a third terminal. The first terminal of the charging management circuit 212 is a power input terminal VDD of the charging and discharging management circuit 210, and is used for connecting with an external power source. The charging management circuit 212 further has a second terminal and a third terminal, and the second terminal and the third terminal of the charging management circuit 212 are both used for outputting electric energy. The second end of the charging management circuit 212 is connected to the first energy storage unit 222 and the second energy storage unit 242, and is configured to output electric energy to the first energy storage unit 222 and the second energy storage unit 242. The third terminal of the charging management circuit 212 is connected to the first terminal of the first processing circuit 230 and the first terminal of the second processing circuit 250, and is configured to output power to the first processing circuit 230 and the second processing circuit 250. The discharge management circuit 214 has a first terminal and a second terminal. A first terminal of the discharge management circuit 214 is connected to the first energy storage unit 222 and the second energy storage unit 242. A second terminal of the discharge management circuit 214 is coupled to a first terminal of the first processing circuit 230 and a first terminal of the second processing circuit 250.

When the charge and discharge management circuit 210 is in the charge management state, the first terminal and the second terminal of the charge management circuit 212 are turned on, the first terminal and the third terminal of the charge management circuit 212 are turned on, and the discharge management circuit 214 is turned off. At this time, the charging management circuit 212 in the charging and discharging management circuit 210 outputs electric energy to the first energy storage unit 222, the second energy storage unit 242, the first processing circuit 230, and the second processing circuit 250. When the charge and discharge management circuit 210 is in the discharge management state, the first terminal and the second terminal of the discharge management circuit 214 are turned on, the first terminal and the second terminal of the charge management circuit 212 are turned off, and the first terminal and the third terminal of the charge management circuit 212 are turned off. At this time, the first and second

energy storage units

222 and 242 output electric energy to the first and

second processing circuits

230 and 250 through the discharge management circuit 214 in the charge and discharge management circuit 210.

Fig. 5 is a schematic structural diagram of another temperature detection circuit 20 according to an embodiment of the present disclosure. As shown in fig. 5, the temperature detection circuit 20 further includes a third temperature sensitive circuit 216 and a resistor R1.

The third temperature-sensitive circuit 216 is attached to the outer surface of the charge and discharge management circuit 210, and is connected to the charge and discharge management circuit 210 in an insulated manner. The resistance of the third temperature sensitive circuit 216 changes with a change in the temperature of the charge and discharge management circuit 210. Generally, as shown in fig. 5, the third temperature-sensitive circuit 216 may include an NTC temperature-sensitive resistor such that the resistance value of the third temperature-sensitive circuit 216 is smaller as the temperature of the charge and discharge management circuit 210 is higher. A first terminal of the third temperature sensitive circuit 216 is connected to the ground GND, and a second terminal of the third temperature sensitive circuit 216 is connected to a third terminal of the first processing circuit 230. In some embodiments, the third temperature-sensitive circuit 216 and the charging and discharging management circuit 210 may be integrated into a charging and discharging management chip, which is not described herein. A first terminal of the resistor R1 is connected to a second terminal of the third temperature-sensitive circuit 216, and a second terminal of the resistor R1 is connected to a third terminal of the charge and discharge management circuit 210. The third terminal of the charge and discharge management circuit 210 is a voltage output terminal REGN of the charge and discharge management circuit 210 for outputting a predetermined voltage. The third terminal of the charge and discharge management circuit 210 is connected to the fourth terminal of the first processing circuit 230, and when the first processing circuit 230 operates, the temperature of the charge and discharge management circuit 210 is determined according to a ratio of a voltage magnitude of the third terminal of the first processing circuit 230 to a voltage magnitude of the fourth terminal of the first processing circuit 230.

When the temperature detection circuit 20 is in operation, the third terminal of the charge/discharge management circuit 210 outputs a voltage, which is divided by the resistor R1 and the third temperature sensitive circuit 216. In the embodiment of the present application, the third terminal of the charge and discharge management circuit 210 is connected to the fourth terminal of the first processing circuit 230, so that the voltage level of the fourth terminal of the first processing circuit 230 is equal to the voltage level of the third terminal of the charge and discharge management circuit 210. The second terminal of the third temperature-sensitive circuit 216 is connected to the third terminal of the first processing circuit 230, so that the voltage level of the third terminal of the first processing circuit 230 is equal to the voltage level of the third temperature-sensitive circuit 216. Thus, the ratio of the voltage magnitude of the third terminal of the first processing circuit 230 to the voltage magnitude of the fourth terminal of the first processing circuit 230 is equal to the ratio of the voltage magnitude of the third temperature-sensitive circuit 216 to the voltage magnitude output by the third terminal of the charge and discharge management circuit 210, that is, the ratio of the resistance value of the third temperature-sensitive circuit 216 to the sum of the resistance value of the third temperature-sensitive circuit 216 and the resistance value of the resistor R1. Thus, the ratio of the voltage magnitude at the third terminal of the first processing circuit 230 to the voltage magnitude at the fourth terminal of the first processing circuit 230 is only related to the resistance value of the third temperature sensitive circuit 216. The first processing circuit 230 determines the temperature of the charge and discharge management circuit 210 according to the ratio of the voltage magnitude at the third terminal of the first processing circuit 230 to the voltage magnitude at the fourth terminal of the first processing circuit 230, so as to avoid the influence of the change of the voltage magnitude output by the third terminal of the charge and discharge management circuit 210 on the detection of the resistance value of the third temperature-sensitive circuit 216, thereby improving the accuracy of detecting the temperature of the charge and discharge management circuit 210.

Further, fig. 6 is a schematic structural diagram of another temperature detection circuit 20 provided in the embodiment of the present application. As shown in fig. 6, the temperature detection circuit 20 further includes a first follower circuit 262 and a second follower circuit 264.

The first follower circuit 262 has a first terminal and a second terminal. The first end of the first follower circuit 262 is connected to the second end of the third temperature-sensitive circuit 216, and the second end of the first follower circuit 262 is connected to the third end of the first processing circuit 230, so that the second end of the third temperature-sensitive circuit 216 is connected to the third end of the first processing circuit 230 through the first follower circuit 262. The second follower circuit 264 has a first terminal and a second terminal. A first terminal of the second follower circuit 264 is connected to the third terminal of the charge and discharge management circuit 210, and a second terminal of the second follower circuit 264 is connected to the fourth terminal of the first processing circuit 230, so that the third terminal of the charge and discharge management circuit 210 is connected to the fourth terminal of the first processing circuit 230 through the second follower circuit 264.

Fig. 7 is a circuit diagram of a first follower circuit 262 and a second follower circuit 264 according to an embodiment of the present application. In some embodiments, as shown in fig. 7, the first follower circuit 262 includes an operational amplifier a1 and resistors R2, R3; the second follower circuit 264 includes an operational amplifier a2, a resistor R4, and a resistor R5.

The non-inverting input terminal of the operational amplifier a1 is connected to the second terminal of the third temperature sensitive circuit 216, the inverting input terminal of the operational amplifier a1 is connected to the output terminal of the operational amplifier a1, and the output terminal of the operational amplifier a1 is connected to the first terminal of the resistor R2. A second terminal of the resistor R2 is connected to a third terminal of the first processing circuit 230. A first terminal of the resistor R3 is connected to a second terminal of the resistor R2, and a second terminal of the resistor R3 is connected to the ground GND. In this way, the first follower circuit 262, which is composed of the operational amplifier a1, the resistor R2 and the resistor R3, on the one hand, the operational amplifier a1 in the first follower circuit 262 can play the role of buffering and isolation, thereby improving the stability of the circuit; on the other hand, the resistor R2 and the resistor R3 in the first follower circuit 262 have a voltage dividing function, so that the voltage magnitude of the third terminal of the first processing circuit 230 can be reduced, thereby protecting the first processing circuit 230.

The non-inverting input terminal of the operational amplifier a2 is connected to the third terminal of the charge and discharge management circuit 210, the inverting input terminal of the operational amplifier a2 is connected to the output terminal of the operational amplifier a2, and the output terminal of the operational amplifier a2 is connected to the first terminal of the resistor R4. A second terminal of the resistor R4 is connected to a fourth terminal of the first processing circuit 230. A first terminal of the resistor R5 is connected to a second terminal of the resistor R4, and a second terminal of the resistor R5 is connected to the ground GND. In this way, the second follower circuit 264 is composed of the operational amplifier a2, the resistor R4 and the resistor R5, on one hand, the operational amplifier a2 in the second follower circuit 264 can play a role of buffering and isolation, thereby improving the stability of the circuit; on the other hand, the resistor R4 and the resistor R5 in the second follower circuit 264 have a voltage dividing function, so that the voltage magnitude at the fourth terminal of the first processing circuit 230 can be reduced, thereby protecting the first processing circuit 230.

In this embodiment, in order to make the ratio of the voltage magnitude at the third end of the first processing circuit 230 to the voltage magnitude at the fourth end of the first processing circuit 230 equal to the ratio of the resistance value of the third temperature sensitive circuit 216 to the sum of the resistance value of the third temperature sensitive circuit 216 and the resistance value of the resistor R1, the resistance value of the resistor R2 may be equal to the resistance value of the resistor R4, and the resistance value of the resistor R3 may be equal to the resistance value of the resistor R5. For example, the resistances of the resistor R2 and the resistor R4 may be 200K Ω (kilo-ohms), and the resistances of the resistor R3 and the resistor R5 may be 100K Ω, respectively. Thus, the voltage magnitude of the third terminal of the first processing circuit 230 is one third of the voltage magnitude of the third temperature-sensitive circuit 216; the magnitude of the voltage at the fourth terminal of the first processing circuit 230 is one third of the magnitude of the voltage output from the third terminal of the charge and discharge management circuit 210.

In some embodiments, still as shown in fig. 7, operational amplifier a1 and operational amplifier a2 may be integrated into a single-chip U1. The model of the singlechip U1 can be RS358AXM MSOP-8.

Fig. 8 is a schematic structural diagram of another temperature detection circuit 20 according to an embodiment of the present disclosure. As shown in fig. 8, in some embodiments, the temperature sensing circuit 20 further includes a controller 270.

As described above, the first processing circuit 230 is configured to detect the resistance value of the first temperature-sensitive circuit, and determine the temperature of the first energy storage unit 222 according to the resistance value of the first temperature-sensitive circuit 224. The first processing circuit 230 is further configured to determine the temperature of the charge and discharge management circuit 210 according to a ratio of a voltage magnitude at the third terminal of the first processing circuit 230 to a voltage magnitude at the fourth terminal of the first processing circuit 230. The second processing circuit 250 is configured to detect a resistance value of the second temperature-sensitive circuit 244 and determine the temperature of the second energy storage unit 242 according to the resistance value of the second temperature-sensitive circuit 244.

The controller 270 has a first end, a second end and a third end, and the first end of the controller 270 is connected to the fifth end of the first processing circuit 230, and is used for inputting the temperature of the first energy storage unit 222 and the temperature of the charging and discharging management circuit 210. In other words, after the first processing circuit 230 determines the temperature of the first energy storage unit 222 and the temperature of the charging and discharging management circuit 210, the temperature of the first energy storage unit 222 and the temperature of the charging and discharging management circuit 210 are output to the first end of the controller 270. A second terminal of the controller 270 is connected to a third terminal of the second processing circuit 250 for inputting the temperature of the second energy storage unit 242. In other words, the second processing circuit 250 determines the temperature of the second energy storage unit 242 and outputs the temperature of the second energy storage unit 242 to the second end of the controller 270. The third terminal of the controller 270 is connected to the fourth terminal of the charge and discharge management circuit 210. The controller 270 may preset a temperature threshold, and when at least one of the temperature of the first energy storage unit 222, the temperature of the second energy storage unit 242, and the temperature of the charge and discharge management circuit 210 exceeds the temperature threshold, the controller 270 controls the charge and discharge management circuit 210 to be turned off.

In a specific embodiment, the temperature detection circuit 20 includes a charge and discharge management circuit 210, a first battery system 220, a second battery system 240, a first processing circuit 230, a second processing circuit 250, and a controller 270. At this time, the first terminal of the controller 270 is connected to the fifth terminal of the first processing circuit 230, the second terminal of the controller 270 is connected to the third terminal of the second processing circuit 250, and the third terminal of the controller 270 is connected to the fourth terminal of the charge and discharge management circuit 210. If at least one of the temperature of the first energy storage unit 222 and the temperature of the second energy storage unit 242 exceeds the temperature threshold, the controller 270 controls the charging and discharging management circuit 210 to be turned off, and the first energy storage unit 222 and the second energy storage unit 242 cannot be charged or discharged through the charging and discharging management circuit 210. In another specific embodiment, the temperature detection circuit 20 includes a charge and discharge management circuit 210, a first battery system 220, a first processing circuit 230, a third temperature sensitive circuit 216, a resistor R1, and a controller 270. At this time, the first terminal of the controller 270 is connected to the fifth terminal of the first processing circuit 230, and the third terminal of the controller 270 is connected to the fourth terminal of the charge and discharge management circuit 210. If at least one of the temperature of the first energy storage unit 222 and the temperature of the charge and discharge management circuit 210 exceeds the temperature threshold, the controller 270 controls the charge and discharge management circuit 210 to be turned off, and the first energy storage unit 222 cannot be charged or discharged through the charge and discharge management circuit 210. In yet another specific embodiment, the temperature detection circuit 20 includes a charge and discharge management circuit 210, a first battery system 220, a second battery system 240, a first processing circuit 230, a second processing circuit 250, a third temperature-sensitive circuit 216, a resistor R1, and a controller 270. At this time, if at least one of the temperature of the first energy storage unit 222, the temperature of the second energy storage unit 242, and the temperature of the charge and discharge management circuit 210 exceeds the temperature threshold, the controller 270 controls the charge and discharge management circuit 210 to be turned off, and the first energy storage unit 222 and the second energy storage unit 242 cannot be charged or discharged through the charge and discharge management circuit 210.

In the embodiment of the present application, the temperature detection circuit 20 includes a charge and discharge management circuit 210, a first battery system 220, and a first processing circuit 230. The first battery system 220 includes a first energy storage unit 222 and a first temperature sensitive circuit 224. When the charging and discharging management circuit 210 is in the charging management state, the charging and discharging management circuit 210 outputs electric energy to the first energy storage unit 222 and the first processing circuit 230; when the charging and discharging management circuit 210 is in the discharging management state, the first energy storage unit 222 outputs the electric energy to the first processing circuit 230 through the charging and discharging management circuit 210. The first processing circuit 230 detects a resistance value of the first temperature-sensitive circuit 224 when powered on, and determines the temperature of the first energy storage unit 222 according to the resistance value of the first temperature-sensitive circuit 224. The first processing circuit 230 detects the resistance of the first temperature-sensitive circuit 224, and the first temperature-sensitive circuit 224 does not need to be connected to the voltage output terminal of the charge and discharge management circuit 210, so that the influence of the change of the voltage output by the voltage output terminal of the charge and discharge management circuit 210 on the detection of the resistance of the first temperature-sensitive circuit 224 can be avoided, and the accuracy of detecting the temperature of the first energy storage unit 222 can be improved.

In addition, the temperature detection circuit 20 may further include a second battery system 240 and a second processing circuit 250. The second battery system 240 includes a second energy storage unit 242 and a second temperature sensitive circuit 244. The second processing circuit 250 detects the resistance of the second temperature-sensitive circuit 244, and the second temperature-sensitive circuit 244 does not need to be connected to the voltage output terminal of the charge and discharge management circuit 210, so that the influence of the change of the voltage output by the voltage output terminal of the charge and discharge management circuit 210 on the detection of the resistance of the second temperature-sensitive circuit 244 can be avoided, and the accuracy of detecting the temperature of the second energy storage unit 242 can be improved. The temperature detection circuit 20 has two battery systems, and can perform temperature detection of charging and discharging for the first energy storage unit 222 and the second energy storage unit 242, so that the safety of an electrical appliance to which the temperature detection circuit 20 is applied can be improved. The temperature sensing circuit 20 further includes a resistor R1 and a third temperature sensitive circuit 216. The third temperature-sensitive circuit 216 is attached to the outer surface of the charge and discharge management circuit 210. The ratio of the voltage magnitude at the third terminal of the first processing circuit 230 to the voltage magnitude at the fourth terminal of the first processing circuit 230 is equal to the ratio of the resistance value of the third temperature-sensitive circuit 216 to the sum of the resistance value of the third temperature-sensitive circuit 216 and the resistance value of the resistor R1. In this way, the temperature detection circuit 20 can also detect the temperature of the charge/discharge management circuit 210, and the safety of the electric appliance to which the temperature detection circuit 20 is applied can be improved. Meanwhile, the first processing circuit 230 determines the temperature of the charge and discharge management circuit 210 according to the ratio of the voltage magnitude at the third end of the first processing circuit 230 to the voltage magnitude at the fourth end of the first processing circuit 230, so that the influence of the change of the voltage magnitude output by the third end of the charge and discharge management circuit 210 on the detection of the resistance value of the third temperature-sensitive circuit 216 can be avoided, and the accuracy of detecting the temperature of the charge and discharge management circuit 210 can be improved. The first follower circuit 262 and the second follower circuit 264 can perform buffering and isolation functions, improve the stability of the circuit, and protect the first processing circuit 230.

The embodiment of the present application further provides an earphone, which includes the temperature detection circuit 20 as described in any one of the above embodiments. Optionally, the headset may be a bluetooth headset, or may be another headset that needs to perform temperature detection of the energy storage unit. In some embodiments, the headset is a headset with noise reduction.

The temperature detection circuit 20 includes a charge and discharge management circuit 210, a first battery system 220, and a first processing circuit 230. The first battery system 220 includes a first energy storage unit 222 and a first temperature-sensitive circuit 224, the first temperature-sensitive circuit 224 is attached to an outer surface of the first energy storage unit 222, and a resistance of the first temperature-sensitive circuit 224 changes with a temperature of the first energy storage unit 222. A first terminal of the charge and discharge management circuit 210 is connected to the first energy storage unit 222, and a second terminal of the charge and discharge management circuit 210 is connected to a first terminal of the first processing circuit 230. When the charging and discharging management circuit 210 is in the charging management state, the charging and discharging management circuit 210 outputs the electric energy to the first energy storage unit 222 and the first processing circuit 230. When the charging and discharging management circuit 210 is in the discharging management state, the first energy storage unit 222 outputs the electric energy to the first processing circuit 230 through the charging and discharging management circuit 210. The first end of the first temperature-sensitive circuit 224 is connected to the ground GND, the second end of the first temperature-sensitive circuit 224 is connected to the second end of the first processing circuit 230, and when the first processing circuit 230 operates, the resistance value of the first temperature-sensitive circuit 224 is detected, and the temperature of the first energy storage unit 222 is determined according to the resistance value of the first temperature-sensitive circuit 224.

In some embodiments, the temperature detection circuit 20 further includes: a second battery system 240 and a second processing circuit 250.

The second battery system 240 includes a second energy storage unit 242 and a second temperature-sensitive circuit 244, the second temperature-sensitive circuit 244 is attached to an outer surface of the second energy storage unit 242, and a resistance of the second temperature-sensitive circuit 244 changes with a change in temperature of the second energy storage unit 242.

A first terminal of the charge and discharge management circuit 210 is connected to the second energy storage unit 242, and a second terminal of the charge and discharge management circuit 210 is connected to a first terminal of the second processing circuit 250. When the charging and discharging management circuit 210 is in the charging management state, the charging and discharging management circuit 210 outputs the electric energy to the second energy storage unit 242 and the second processing circuit 250. When the charging and discharging management circuit 210 is in the discharging management state, the second energy storage unit 242 outputs the electric energy to the second processing circuit 250 through the charging and discharging management circuit 210.

The first end of the second temperature-sensitive circuit 244 is connected to the ground GND, the second end of the second temperature-sensitive circuit 244 is connected to the second end of the second processing circuit 250, and when the second processing circuit 250 operates, the resistance value of the second temperature-sensitive circuit 244 is detected, and the temperature of the second energy storage unit 242 is determined according to the resistance value of the second temperature-sensitive circuit 244.

In some embodiments, the temperature detection circuit 20 further includes: a third temperature sensitive circuit 216 and a resistor R1.

The third temperature-sensitive circuit 216 is attached to the outer surface of the charge and discharge management circuit 210, and the resistance of the third temperature-sensitive circuit 216 changes with the temperature of the charge and discharge management circuit 210.

A first terminal of the third temperature sensitive circuit 216 is connected to the ground GND, and a second terminal of the third temperature sensitive circuit 216 is connected to a third terminal of the first processing circuit 230.

The first end of the resistor R1 is connected to the second end of the third temperature-sensitive circuit 216, the second end of the resistor R1 is connected to the third end of the charge and discharge management circuit 210, and the third end of the charge and discharge management circuit 210 is configured to output a preset voltage.

The third terminal of the charge and discharge management circuit 210 is connected to the fourth terminal of the first processing circuit 230, and when the first processing circuit 230 operates, the temperature of the charge and discharge management circuit 210 is determined according to a ratio of a voltage magnitude of the third terminal of the first processing circuit 230 to a voltage magnitude of the fourth terminal of the first processing circuit 230.

In some embodiments, the temperature detection circuit 20 further includes: the first follower circuit 262.

The first end of the first follower circuit 262 is connected to the second end of the third temperature-sensitive circuit 216, and the second end of the first follower circuit 262 is connected to the third end of the first processing circuit 230.

In some embodiments, the first follower circuit 262 includes: operational amplifier a1, resistor R2, and resistor R3.

The non-inverting input terminal of the operational amplifier a1 is connected to the second terminal of the third temperature sensitive circuit 216, the inverting input terminal of the operational amplifier a1 is connected to the output terminal of the operational amplifier a1, and the output terminal of the operational amplifier a1 is connected to the first terminal of the resistor R2.

A second terminal of the resistor R2 is connected to a third terminal of the first processing circuit 230.

A first terminal of the resistor R3 is connected to a second terminal of the resistor R2, and a second terminal of the resistor R3 is connected to the ground GND.

In some embodiments, the temperature detection circuit 20 further includes: the second follower circuit 264.

A first terminal of the second follower circuit 264 is connected to the third terminal of the charge and discharge management circuit 210, and a second terminal of the second follower circuit 264 is connected to the fourth terminal of the first processing circuit 230.

In some embodiments, the second follower circuit 264 includes: operational amplifier a2, resistor R4, and resistor R5.

The non-inverting input terminal of the operational amplifier a2 is connected to the third terminal of the charge and discharge management circuit 210, the inverting input terminal of the operational amplifier a2 is connected to the output terminal of the operational amplifier a2, and the output terminal of the operational amplifier a2 is connected to the first terminal of the resistor R4.

A second terminal of the resistor R4 is connected to a fourth terminal of the first processing circuit 230.

A first terminal of the resistor R5 is connected to a second terminal of the resistor R4, and a second terminal of the resistor R5 is connected to the ground GND.

In some embodiments, the temperature detection circuit 20 further includes: a controller 270.

A first terminal of the controller 270 is connected to the fifth terminal of the first processing circuit 230 for inputting the temperature of the first energy storage unit 222, and a second terminal of the controller 270 is connected to the third terminal of the second processing circuit 250 for inputting the temperature of the second energy storage unit 242.

The third terminal of the controller 270 is connected to the fourth terminal of the charge and discharge management circuit 210, so that when at least one of the temperature of the first energy storage unit 222 and the temperature of the second energy storage unit 242 exceeds a temperature threshold, the controller 270 controls the charge and discharge management circuit 210 to be turned off.

A first end of the controller 270 is connected to the fifth end of the first processing circuit 230 to input the temperature of the first energy storage unit 222 and the temperature of the charge and discharge management circuit 210.

The third terminal of the controller 270 is connected to the fourth terminal of the charge and discharge management circuit 210, so that when at least one of the temperature of the first energy storage unit 222 and the temperature of the charge and discharge management circuit 210 exceeds a temperature threshold, the controller 270 controls the charge and discharge management circuit 210 to be turned off.

It should be understood that the earphone is one of the application scenarios of the temperature detection circuit 20 provided in the embodiments of the present application, but does not represent that the temperature detection circuit 20 can only be applied to the earphone. As will be understood by those skilled in the art, the temperature detection circuit 20 can be applied to any electrical appliance that needs the energy storage unit to provide power, such as a bluetooth speaker, a mobile phone, and other mobile terminals.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A temperature sensing circuit, comprising: the charging and discharging management circuit comprises a charging and discharging management circuit, a first battery system and a first processing circuit;

2. The temperature detection circuit of claim 1, wherein the temperature detection circuit further comprises: a second battery system and a second processing circuit;

3. The temperature detection circuit according to claim 1 or 2, wherein the temperature detection circuit further comprises: a third temperature sensitive circuit and resistor R1;

4. The temperature detection circuit of claim 3, wherein the temperature detection circuit further comprises: a first follower circuit;

5. The temperature sensing circuit of claim 4, wherein the first follower circuit comprises: an operational amplifier A1, a resistor R2 and a resistor R3;

6. The temperature detection circuit of claim 3, wherein the temperature detection circuit further comprises: a second follower circuit;

7. The temperature sensing circuit of claim 6, wherein the second follower circuit comprises: an operational amplifier A2, a resistor R4 and a resistor R5;

8. The temperature detection circuit of claim 2, wherein the temperature detection circuit further comprises: a controller;

9. The temperature detection circuit of claim 3, wherein the temperature detection circuit further comprises: a controller;

10. An earphone characterized by comprising a temperature detection circuit according to any one of claims 1 to 9.