WO2019000865A1

WO2019000865A1 - Peripheral circuit of bluetooth headset battery

Info

Publication number: WO2019000865A1
Application number: PCT/CN2017/117483
Authority: WO
Inventors: 卢永江; 陈海龙; 曹新放
Original assignee: 歌尔股份有限公司
Priority date: 2017-06-27
Filing date: 2017-12-20
Publication date: 2019-01-03
Also published as: CN107171396B; CN107171396A

Abstract

Provided is a peripheral circuit of a Bluetooth headset battery, comprising a power supply, a charging chip, two filter circuits, and two batteries correspondingly connected to the two filter circuits respectively, wherein the filter circuits carry out filtering on a power supply accessing a corresponding battery, so as to filter out a random signal in the filter circuits, thereby improving the stability of radio-frequency signal transmission of a Bluetooth headset; and at the same time, a first voltage measurement module, a second voltage measurement module and a third voltage measurement module are provided to respectively measure values of voltages output after passing through voltage value charging chips of the two batteries, and according to the voltage values measured by the first voltage measurement module, the second voltage measurement module and the third voltage measurement module, whether a short circuit occurs in the two batteries is determined, so as to effectively detect the problems of a short circuit and an open circuit of the batteries or a reversal connection of positive and negative electrode lines of the batteries in the Bluetooth headset.

Description

Peripheral circuit of Bluetooth headset battery

Technical field

The present invention relates to the field of Bluetooth headset technology, and more particularly to a peripheral circuit of a Bluetooth headset battery.

Background technique

With the rapid development of mobile communication technology, the use of electronic devices such as mobile phones and PADs is becoming more and more popular. However, due to the large electromagnetic radiation of electronic devices such as mobile phones, long-term use may have a certain impact on the health of users, and It may not be convenient to hold a mobile phone in certain situations. At present, the most widely used Bluetooth technology in daily life is the Bluetooth headset, and its biggest feature is portability and wireless operation, so that users can use the mobile phone even when it is not convenient to hold the mobile phone. For example, wearing a Bluetooth headset, the user can write a message while talking on the phone, can talk while driving while driving, while talking about the phone while doing things without being tied by the wires. Since the electromagnetic wave of the Bluetooth earphone is much lower than that of the mobile phone, when the phone is placed in the bag or in the pocket, it is not necessary to hold the hand, and the electromagnetic wave can be effectively reduced.

The current Bluetooth headset has a battery. However, the existing Bluetooth headset usually puts the battery together with the left and right earphone speakers, that is, the Bluetooth headset has two batteries, one of which is placed with the left earphone speaker, and the other A battery is placed with the right earphone speaker. The current signal generated by the battery will affect the transmission of the Bluetooth signal, and increase the noise floor of the Bluetooth headset; and, there is no detection line in the Bluetooth headset to detect the solder joint or short circuit of the battery, once the battery is soldered or shorted It cannot be detected effectively in time; in addition, the existing Bluetooth headset cannot effectively detect the battery power, so the user cannot replace the battery in time, which affects the user experience.

Summary of the invention

In view of the above problems, the present invention provides a peripheral circuit of a Bluetooth earphone battery to solve the problem that the existing Bluetooth earphone is unstable in signal transmission, the filter capacitor is easily damaged, and the battery short circuit cannot be detected.

The peripheral circuit of the Bluetooth earphone battery provided by the present invention comprises a power source, a charging chip, a first filter circuit, a first battery connected to the first filter circuit, a second filter circuit, and a second battery connected to the second filter circuit; The power source is respectively connected to the first filter circuit and the second filter circuit for filtering processing, and the filtered power source is respectively connected to the first battery and the second battery to charge the first battery and the second battery. Wherein a first voltage measuring module is disposed between the first filter circuit and the first battery, the first voltage measuring module is configured to measure a voltage value flowing through the first battery; between the second filter circuit and the second battery A second voltage measuring module is provided, wherein the second voltage measuring module is configured to measure a voltage value flowing through the second battery; a third voltage measuring module is disposed at an output end of the charging chip, and the third voltage measuring module is configured to measure the charging chip output a voltage value; wherein, according to the voltage value of the charging chip output measured by the third voltage measuring module, the first voltage measuring module measures Voltage through the first battery voltage value and a second voltage measurement module measured flowing through the second cell to determine whether the first battery and the second battery short.

In addition, a preferred structure is: the first filter circuit includes a first capacitor, a second capacitor, and a first resistor; wherein, one end of the first capacitor is connected to the output end of the charging chip, and the other end is grounded; The output end of the chip is connected and the other end is grounded; one end of the first resistor is connected to the output end of the charging chip, and the other end is connected to the first battery.

In addition, a preferred structure is: the second filter circuit includes a third capacitor, a fourth capacitor, and a second resistor; wherein, one end of the second resistor is connected to the output end of the charging chip, and the other end is connected to the second battery; One end is connected to the output end of the charging chip, and the other end is grounded; one end of the fourth capacitor is connected to the output end of the charging chip, and the other end is grounded.

In addition, the preferred structure is: further comprising: a power acquisition module, wherein the power acquisition module is respectively connected to the output end of the charging chip, the first voltage measuring module, the second voltage measuring module, and the third voltage measuring module; wherein, the charging chip is powered The module is powered, and the power acquisition module obtains the power of the first battery and the second battery according to the voltage value flowing through the first battery, the voltage value flowing through the second battery, and the voltage value output by the charging chip.

In addition, the preferred structure is: further comprising a filter capacitor, one end of the filter capacitor is connected to the output end of the charging chip, and the other end is grounded, and the filter capacitor is used to filter the power source of the access power acquisition module.

In addition, the preferred structure is that the power acquisition module uses the MAX17048 chip.

In addition, a preferred structure is that the difference between the voltage value output by the charging chip and the voltage value flowing through the first battery is the first voltage value; the difference between the voltage value output by the charging chip and the voltage value flowing through the second battery is a second voltage value; determining whether the first battery and the second battery are short-circuited according to the first voltage value and the second voltage value.

In addition, a preferred structure is: when the difference between the first voltage value and the second voltage value is less than a preset value, determining that the first battery is short-circuited; when the difference between the second voltage value and the first voltage value is less than a preset value , determining that the second battery is shorted.

Further, a preferred structure is that the first voltage measuring module is located between the other end of the first resistor and the first battery.

Further, a preferred structure is that the second voltage measuring module is located between the other end of the second resistor and the second battery.

The peripheral circuit of the Bluetooth earphone battery provided by the present invention filters the power source connected to the first battery by setting a first filter circuit, and filters the power source connected to the second battery through the second filter circuit, thereby filtering out the circuit in the circuit. The chaotic signal improves the stability of the radio frequency signal transmission of the Bluetooth headset; meanwhile, the voltage value flowing through the first battery is measured by setting the first voltage measurement module, the second voltage measurement module, and the third voltage measurement module, respectively, and flowing through the second battery The voltage value and the voltage value output by the charging chip determine whether the first battery and the second battery are short-circuited according to the voltage values measured by the first voltage measuring module, the second voltage measuring module and the third voltage measuring module, thereby effectively detecting the Bluetooth The short circuit of the battery of the earphone, the open circuit, and the reverse connection of the positive and negative lines of the battery.

In order to achieve the above and related ends, one or more aspects of the present invention include the features which are described in detail below and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail However, these aspects are indicative of only some of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to cover all such aspects and their equivalents.

DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent from the Detailed Description In the drawing:

1 is a first logic structural block diagram of a peripheral circuit of a Bluetooth earphone battery according to an embodiment of the present invention;

2 is a diagram showing the structure of a peripheral circuit of the Bluetooth earphone battery shown in FIG. 1 according to an embodiment of the present invention;

3 is a second logical block diagram of a peripheral circuit of a Bluetooth headset battery in accordance with an embodiment of the present invention.

The same reference numerals are used throughout the drawings to refer to the

Detailed ways

Various embodiments of the present invention will be described below with reference to the drawings.

In view of the above-mentioned existing Bluetooth headset, there is a problem that the bottom noise is large and the battery that cannot be soldered or short-circuited can be effectively detected. The present invention filters the power source connected to the first battery by setting the first filter circuit, and passes through the second filter circuit. Filtering the power supply connected to the second battery, thereby filtering out the disordered signal in the circuit, improving the stability of the RF signal transmission of the Bluetooth headset; and simultaneously setting the first voltage measurement module, the second voltage measurement module, and the third voltage measurement The module respectively measures a voltage value flowing through the first battery, a voltage value flowing through the second battery, and a voltage value output by the charging chip, and the voltage is measured according to the first voltage measuring module, the second voltage measuring module, and the third voltage measuring module. The value determines whether the first battery and the second battery are short-circuited, thereby effectively detecting a short circuit problem in the battery of the Bluetooth headset.

To illustrate the peripheral circuitry of the Bluetooth headset battery provided by the present invention, FIG. 1 illustrates the logical structure of a peripheral circuit of a Bluetooth headset battery in accordance with an embodiment of the present invention, and FIG. 2 illustrates the The structure of the peripheral circuit of the Bluetooth headset battery.

As shown in FIG. 1, the peripheral circuit of the Bluetooth earphone battery provided by the present invention includes a power source 10, a charging chip 20, a first filter circuit 30, a first battery 40 connected to the first filter circuit, a second filter circuit 50, and a second The second battery 60 is connected to the filter circuit 50. The power source 10 is respectively connected to the first filter circuit 30 and the second filter circuit 50 via the charging chip 20 for filtering processing, and the filtered power source is respectively connected to the first battery 40 and the second battery 60 to the first battery. 40 and the second battery 60 are charged.

The first voltage measuring module 70 is disposed between the first filter circuit 30 and the first battery 40, and the first voltage measuring module 70 is configured to measure a voltage value flowing through the first battery 40; A second voltage measuring module 80 is disposed between the second battery 60. The second voltage measuring module 80 is configured to measure a voltage value flowing through the second battery 60. The third voltage measuring module 90 is disposed at an output end of the charging chip 20, The third voltage measuring module 90 is configured to measure the voltage value output by the charging chip 20; wherein, according to the voltage value output by the charging chip 20 measured by the third voltage measuring module 90, the measured current measured by the first voltage measuring module 70 The voltage value of the first battery 40 and the voltage value measured by the second voltage measuring module 80 flowing through the second battery 60 determine whether the first battery 40 and the second battery 60 are short-circuited.

Specifically, the difference between the voltage value output by the charging chip 20 measured by the third voltage measuring module 90 and the voltage value measured by the first voltage measuring module 70 flowing through the first battery 40 is a first voltage value, The difference between the voltage value output by the charging chip 20 measured by the three-voltage measuring module 90 and the voltage value measured by the second voltage measuring module 80 flowing through the second battery 60 is a second voltage value, according to the first voltage value. And determining whether the first battery and the second battery are short-circuited with the second voltage value.

Wherein, when the difference between the first voltage value and the second voltage value is less than a preset value, determining that the first battery 40 is short-circuited; when the difference between the second voltage value and the first voltage value is less than a preset value, determining the second Battery 60 is shorted.

Specifically, as shown in FIG. 2, the power supply VBUS is respectively connected to the first filter circuit and the second filter circuit via the charging chip Charger for filtering processing. The first filter circuit includes a capacitor C2, a capacitor C3 and a resistor R1. One end of the capacitor C2 is connected to the output end of the charging chip Charger, and the other end is grounded. One end of the capacitor C3 is connected to the output end of the charging chip Charger, and the other end is connected. Grounding; one end of the resistor R1 is connected to the output end of the charging chip Charger, and the other end is connected to the first battery BT1. The second filter circuit includes a capacitor C4, a capacitor C5 and a resistor R2. One end of the resistor R2 is connected to the output end of the charging chip Charger, the other end is connected to the second battery BT2, and one end of the capacitor C4 is connected to the output end of the charging chip. The other end is grounded, and one end of the capacitor C5 is also connected to the output end of the charging chip, and the other end is grounded.

Specifically, due to the limitation of the structure of the Bluetooth headset, the capacitor C3 and the capacitor C4 are often selected as the 0201 size capacitor in the small package, and the 0201 capacitor is currently capable of achieving 2.2 uF in the industry, and the maximum withstand voltage is 10V. The maximum withstand voltage value is usually higher, and the capacitor with a withstand voltage of 6.3V is easily broken by the spike, which causes the capacitor C3 and capacitor C4 to be damaged. Therefore, the capacitor C2 is added to the first filter circuit, and the capacitor C5 is added to the second filter circuit. The capacitor C2 and the capacitor C5 are capacitors with a small capacitance, which can effectively absorb high-frequency pulses, thereby reducing cost and enabling Avoid damage to capacitors C3 and C4.

Further, since the existing Bluetooth headset is provided with a battery in each of the left and right ears, such as a battery disconnected due to a solder joint or a short circuit, it cannot be detected. Therefore, in order to effectively filter out the disordered signal of the circuit and simultaneously detect the short circuit phenomenon of the battery, the resistor R1 is added in the first filter circuit, the resistor R2 is added in the second filter circuit, and the resistor R1 and the first battery BT1 are simultaneously The first voltage measuring module TP1 is disposed between the resistor R2 and the second battery BT2, and the third voltage measuring module TP3 is disposed at the output end of the charging chip. The voltage value output by the charging chip, the voltage value flowing through the first battery, and the voltage value of the second battery are measured by the third voltage measuring module TP3, the first voltage measuring module TP1 and the second voltage measuring module TP2, respectively, in the charging state. And measuring the difference between the measured voltage value of the charging chip and the voltage value measured by the first voltage measuring module flowing through the first battery as V1, and measuring the measured voltage value of the charging chip and the second The difference between the voltage value measured by the voltage measuring module and flowing through the second battery is recorded as V2. When the voltage difference between V1 and V2 does not exceed the preset value, it indicates that the first battery does not have a virtual soldering or short circuit phenomenon. Specifically, the above preset value is between 0V and 0.05V. If the voltage difference between V1 and V2 exceeds 0.05V, it indicates that the first battery BT1 may have a virtual soldering or short circuit phenomenon; similarly, if the voltages of V2 and V1 are A difference of more than 0.05V indicates that the second battery BT2 may have a solder joint or a short circuit phenomenon.

Further, in order to enable the Bluetooth headset user to see the power of the Bluetooth headset battery, the peripheral circuit of the Bluetooth headset battery provided by the present invention further includes a power acquisition module. 3 illustrates a second logical structure of a peripheral circuit of a Bluetooth headset battery in accordance with an embodiment of the present invention.

As shown in FIG. 3, the power acquisition module 300 is respectively connected to the output end of the charging chip 20, the first voltage measuring module 70, the second voltage measuring module 80, and the third voltage measuring module 90; wherein, the charging chip is a power acquiring module. The power supply, the power acquisition module is configured according to the voltage value of the first battery measured by the first voltage measurement module, the voltage value of the second battery measured by the second voltage measurement module, and the third voltage measurement module. The voltage value output by the charging chip acquires the amount of power of the first battery and the second battery. The peripheral circuit of the Bluetooth earphone battery provided by the present invention further includes a filtering module, wherein the filtering module includes a filter capacitor, one end of the capacitor is connected to the output end of the charging chip, and the other end is grounded, and the capacitor is used to connect the power of the power acquiring module. Perform filtering processing.

Specifically, the power acquisition module uses the MAX17048 chip, and the power acquisition module is further connected to the Bluetooth control chip, and is configured to transmit to the Bluetooth control chip after acquiring the power of the first battery and the second battery, and the Bluetooth control chip passes the I2C protocol. The power of the first battery and the second battery is fed back to the power monitoring module that enables the Bluetooth headset user to hear/see.

Although various embodiments of the peripheral circuit of the Bluetooth earphone battery according to the present invention have been described above with reference to the drawings, those skilled in the art should understand that the peripheral circuits of the Bluetooth earphone battery proposed by the present invention can also be used in various embodiments. Various improvements are made without departing from the scope of the invention. Therefore, the scope of the invention should be determined by the content of the appended claims.

Claims

A peripheral circuit of a Bluetooth earphone battery, comprising: a power source, a charging chip, a first filter circuit, a first battery connected to the first filter circuit, a second filter circuit, and a second connected to the second filter circuit Battery; among them,

The power source is respectively connected to the first filter circuit and the second filter circuit for filtering processing by the charging chip, and the filtered power source is respectively connected to the first battery and the second battery, to a battery and a second battery are charged; wherein

Providing a first voltage measurement module between the first filter circuit and the first battery, the first voltage measurement module for measuring a voltage value flowing through the first battery;

Providing a second voltage measurement module between the second filter circuit and the second battery, the second voltage measurement module for measuring a voltage value flowing through the second battery;

a third voltage measurement module is disposed at the output end of the charging chip, and the third voltage measurement module is configured to measure a voltage value output by the charging chip;

a voltage value output by the charging chip measured by the third voltage measuring module, a voltage value measured by the first voltage measuring module flowing through the first battery, and the second voltage measuring module The measured voltage value flowing through the second battery determines whether the first battery and the second battery are short-circuited.
The peripheral circuit of the Bluetooth earphone battery according to claim 1, wherein

The first filter circuit includes a first capacitor, a second capacitor, and a first resistor; wherein

One end of the first capacitor is connected to an output end of the charging chip, and the other end is grounded;

One end of the second capacitor is connected to an output end of the charging chip, and the other end is grounded;

One end of the first resistor is connected to an output end of the charging chip, and the other end is connected to the first battery.
The peripheral circuit of the Bluetooth earphone battery according to claim 1, wherein

The second filter circuit includes a third capacitor, a fourth capacitor, and a second resistor; wherein

One end of the second resistor is connected to the output end of the charging chip, and the other end is connected to the second battery;

One end of the third capacitor is connected to an output end of the charging chip, and the other end is grounded;

One end of the fourth capacitor is connected to the output end of the charging chip, and the other end is grounded.
The peripheral circuit of the Bluetooth headset battery of claim 1, further comprising:

a power acquisition module, wherein the power acquisition module is respectively connected to an output end of the charging chip, the first voltage measurement module, a second voltage measurement module, and a third voltage measurement module;

The power storage module is powered by the charging chip, and the power acquiring module is configured to calculate a voltage value flowing through the first battery, a voltage value flowing through the second battery, and a voltage output by the charging chip. The value acquires the amount of power of the first battery and the second battery.
The peripheral circuit of the Bluetooth headset battery of claim 4, further comprising:

a filter capacitor, one end of the filter capacitor is connected to the output end of the charging chip, and the other end is grounded, and the filter capacitor is used to filter the power source connected to the power quantity acquisition module.
The peripheral circuit of the Bluetooth earphone battery according to claim 1, wherein

The difference between the voltage value output by the charging chip and the voltage value flowing through the first battery is a first voltage value;

The difference between the voltage value output by the charging chip and the voltage value flowing through the second battery is a second voltage value;

Determining whether the first battery and the second battery are short-circuited according to the first voltage value and the second voltage value.
A peripheral circuit of a Bluetooth earphone battery according to claim 6, wherein

Determining that the first battery is short-circuited when a difference between the first voltage value and the second voltage value is less than a preset value;

When the difference between the second voltage value and the first voltage value is less than the preset value, determining that the second battery is short-circuited.
The peripheral circuit of the Bluetooth earphone battery according to claim 2, wherein

The first voltage measuring module is located between the other end of the first resistor and the first battery.
The peripheral circuit of the Bluetooth earphone battery according to claim 3, wherein

The second voltage measurement module is located between the other end of the second resistor and the second battery.