CN112039152A - Bluetooth earphone - Google Patents

Bluetooth earphone Download PDF

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Publication number
CN112039152A
CN112039152A CN202010880048.1A CN202010880048A CN112039152A CN 112039152 A CN112039152 A CN 112039152A CN 202010880048 A CN202010880048 A CN 202010880048A CN 112039152 A CN112039152 A CN 112039152A
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CN
China
Prior art keywords
unit
battery
protection circuit
signal
battery protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010880048.1A
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Chinese (zh)
Other versions
CN112039152B (en
Inventor
宋利军
宋朋亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xi'an Wenxian Semiconductor Technology Co ltd
Original Assignee
Xi'an Wenxian Semiconductor Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xi'an Wenxian Semiconductor Technology Co ltd filed Critical Xi'an Wenxian Semiconductor Technology Co ltd
Priority to CN202010880048.1A priority Critical patent/CN112039152B/en
Priority claimed from CN202010880048.1A external-priority patent/CN112039152B/en
Publication of CN112039152A publication Critical patent/CN112039152A/en
Priority claimed from PCT/CN2021/115169 external-priority patent/WO2022042708A1/en
Application granted granted Critical
Publication of CN112039152B publication Critical patent/CN112039152B/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/0071Regulation of charging or discharging current or voltage with a programmable schedule
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302Overcharge protection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306Overdischarge protection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0069Charging or discharging for charge maintenance, battery initiation or rejuvenation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/10Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1025Accumulators or arrangements for charging

Abstract

The application provides a bluetooth headset, include: a system circuit; a battery having a capacity of 10mAH to 80 mAH; a battery protection circuit, comprising: the power supply system comprises a power supply end, a power grounding end, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharge overcurrent protection unit, a reference voltage generation unit, a frequency generation unit, a control unit and a first switch unit, wherein the power supply end and the power grounding end are respectively electrically connected with a battery, and the first switch unit is used for controlling the battery to supply power to a system circuit; the system circuit is electrically connected with the battery protection circuit, the battery protection circuit enters a shipping mode when the system circuit outputs a first signal to the battery protection circuit, and the first switch unit is switched off to enable the battery to stop supplying power to the system circuit in the shipping mode. The application has the advantages that: the current consumption of the battery in the transportation and storage processes can be reduced, the electric quantity retention time of the battery is prolonged, and the user experience is improved.

Description

Bluetooth earphone
Technical Field
The application relates to the technical field of electronics, especially, relate to a bluetooth headset.
Background
The battery assembly is widely applied to the Bluetooth headset to provide a more flexible use environment for the Bluetooth headset without being limited by the range of the socket and the power supply wire. Generally, a battery assembly includes a bare cell, a battery protection circuit electrically connected to the bare cell to prevent the bare cell from being overcharged or overdischarged.
After the bluetooth headset of electrified pond subassembly is made in the place of production, the bluetooth headset is shut down after the battery pack is filled with predetermined electric quantity, then transport, the storage through longer time, finally when the terminal user takes the bluetooth headset to use for the first time, because long-time transport, storage, the bluetooth headset probably is discharged completely because internal current consumes, therefore the terminal user must charge and resume the electric quantity to the bluetooth headset before using for the first time, lead to user's experience to worsen.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present application is to provide a bluetooth headset. The current consumption of the battery in the transportation and storage processes can be reduced, the electric quantity retention time of the battery is prolonged, and the user experience is improved.
In order to solve the above technical problem, an embodiment of the present application provides a bluetooth headset, including:
a system circuit;
a battery having a capacity of 10mAH to 80 mAH;
a battery protection circuit, comprising: the power supply system comprises a power supply end, a power grounding end, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharge overcurrent protection unit, a reference voltage generation unit, a frequency generation unit, a control unit and a first switch unit, wherein the power supply end and the power grounding end are respectively electrically connected with a battery, and the first switch unit is used for controlling the battery to supply power to a system circuit;
the system circuit is electrically connected with the battery protection circuit, the battery protection circuit enters a shipping mode when the system circuit outputs a first signal to the battery protection circuit, and the first switch unit is switched off to enable the battery to stop supplying power to the system circuit in the shipping mode.
Optionally, the battery protection circuit includes a shipping input terminal, the shipping input terminal is electrically connected to the system circuit, and the system circuit outputs the first signal through the shipping input terminal.
Optionally, the battery protection circuit further includes a wake-up unit, at least some units of the battery protection circuit are powered off in the shipping mode, and the wake-up unit is powered on in the shipping mode, and the wake-up unit is configured to enable the battery protection circuit to exit the shipping mode.
Optionally, the wake-up unit is a charging detection unit.
Optionally, when the charging detection unit detects a charging signal, the battery protection circuit exits the shipping mode.
Optionally, at least one of the overcharge voltage protection unit, the overdischarge voltage protection unit, the discharge overcurrent protection unit, the control unit, the reference voltage generation unit and the frequency generation unit is powered off.
Optionally, when the battery protection circuit enters the shipping mode, the circuits of the battery protection circuit except the wake-up unit are all powered off.
Optionally, the battery protection circuit is triggered to generate a shipping control signal to enter a shipping mode when the battery protection circuit receives the first signal.
Optionally, the first signal is an encoded signal of a protocol between the battery protection circuit and the system circuit.
Optionally, the first signal includes a pulse signal, the battery protection circuit further includes a pulse counting unit, the pulse counting unit is electrically connected to the shipping input terminal, and when the number of pulses received by the pulse counting unit in a first predetermined time period is greater than or equal to a first predetermined number, the generation of the shipping control signal is triggered.
Optionally, the first signal includes a continuous high-level signal or a continuous low-level signal, the battery protection circuit further includes a first timing unit, the first timing unit is electrically connected to the shipping input terminal, and when the duration of the high-level signal or the low-level signal received by the first timing unit is greater than or equal to a second predetermined time period, the first timing unit triggers generation of the shipping control signal.
Optionally, the over-discharge voltage protection unit includes a comparator and a second timing unit, an output end of the comparator is electrically connected to the second timer, the first signal is a continuous high level signal or a continuous low level signal, the battery protection circuit further includes a second switch unit and a first resistor, a control end of the second switch unit is electrically connected to the shipping pin, an input end of the second switch unit is grounded, an output end of the second switch unit is electrically connected to one end of the first resistor, another end of the first resistor is connected to a high level, an output end of the second switch unit is electrically connected to a reverse end of the comparator of the over-discharge voltage protection unit, an output end of the comparator is electrically connected to the second timing unit, when the shipping pin receives the first signal, the second switch unit is turned on, and when a duration time of the high level received by the second timing unit is greater than or equal to a third predetermined time period, the second timing unit triggers generation of the ship And operating the control signal.
Optionally, the first switching unit includes a MOS transistor.
Optionally, the battery protection circuit is fabricated on the same chip, or all units of the battery protection circuit except the first switch unit are fabricated on the same chip.
The embodiment of the application has the following beneficial effects: since the bluetooth headset includes: a system circuit; a battery having a capacity of 10mAH to 80 mAH; a battery protection circuit, comprising: the power supply system comprises a power supply end, a power grounding end, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharge overcurrent protection unit, a reference voltage generation unit, a frequency generation unit, a control unit and a first switch unit, wherein the power supply end and the power grounding end are respectively electrically connected with a battery, and the first switch unit is used for controlling the battery to supply power to a system circuit; the system circuit is electrically connected with the battery protection circuit, the battery protection circuit enters a shipping mode when the system circuit outputs a first signal to the battery protection circuit, and the first switch unit is switched off to enable the battery to stop supplying power to the system circuit in the shipping mode. Under the shipping mode, first switch element disconnection to the battery can not be to system circuit power supply, can save the electric quantity of battery in a large number, and after the user took bluetooth headset, bluetooth headset start can be with normal use, has promoted user's experience.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic circuit block diagram of a bluetooth headset according to an embodiment of the present application;
FIG. 2 is a waveform diagram of the signals received at the ship-in end and the output signal of the pulse counting unit of FIG. 1;
fig. 3 is a schematic circuit block diagram of a bluetooth headset according to another embodiment of the present application;
fig. 4 is a schematic circuit block diagram of a bluetooth headset according to another embodiment of the present application;
FIG. 5 is a waveform diagram of the signals received at the ship input end and the output signal of the first timing unit of FIG. 4;
fig. 6 is a schematic circuit block diagram of a bluetooth headset according to yet another embodiment of the present application;
fig. 7 is a specific circuit implementation diagram of the ship input terminal and the over-discharge voltage protection unit according to an embodiment of the present application;
FIG. 8 is a waveform diagram of the signals received at the ship input end and the output signal of the second timing unit of FIG. 7;
description of the figure numbers:
100. 500, 600-battery protection circuit; 200-system circuitry; 300-a battery; VDD-power supply terminal; GND-power ground; VM-System ground; CTL-shipping input; 110-an overcharge voltage protection unit; 120-charging overcurrent protection unit; 130-discharge overcurrent protection unit; 140-reference voltage generating unit; 150-a frequency generation unit; 160-a control unit; 170-a wake-up unit; 180-a first switching unit; 190-an over-discharge voltage protection unit; 191-a comparator; 192-a second timing unit; 410-a temperature protection unit; 420-a pulse counting unit; 430-a first timing unit; 440-a second switching unit; r1 — first resistance; r2 — second resistance; r3 — third resistance; c-capacitance; t1 — a second predetermined period of time; t2-third predetermined period of time.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims and drawings of this application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
An embodiment of the present application provides a bluetooth headset, please refer to fig. 1, where the bluetooth headset includes a battery assembly and a system circuit 200, the system circuit 200 is, for example, a circuit composed of a microprocessor, a camera driving circuit, an image processor, and the like, the system circuit 200 is electrically connected to the battery assembly, and the battery assembly is used for supplying power to the system circuit 200. The battery assembly includes a battery 300 and a battery protection circuit 100, the battery protection circuit 100 is electrically connected to the positive and negative electrodes of the battery 300, the system circuit 200 is electrically connected to the battery protection circuit 100, the battery 300 supplies power to the battery protection circuit 100, and the battery protection circuit 100 plays a role in protection, for example, when the battery 300 is overcharged or overdischarged, since how the battery protection circuit 100 protects the battery 300 from overcharge and overdischarge is a common technical measure in the art, it is not described herein again. In the present embodiment, the number of the batteries 300 is one or more, and when the number of the batteries 300 is plural, the plurality of batteries 300 may be connected in parallel or in series or in a mixture of series and parallel, and the batteries 300 are preferably lithium batteries 300. In this embodiment, since the volume of the bluetooth headset itself is relatively small, the capacity of the battery 300 is also relatively small, generally, the capacity of the battery is 10mAH-80mAH, for example, 10mAH, 20mAH, 30mAH, 40mAH, 50mAH, 60mAH, 70mAH, and 80mAH, and the volume of the battery 300 with such a capacity is relatively small, preferably, the capacity of the battery 300 is 20mAH-40mAH, and at this time, the battery 300 has a smaller volume, and can be conveniently configured in a small bluetooth headset, thereby facilitating miniaturization of the bluetooth headset. Furthermore, since the capacity of the battery 300 is so small, how the amount of electricity of the battery 300 is maintained for a long time becomes an important issue. In addition, in other embodiments of the present application, referring to fig. 3, the battery protection circuit 100 further includes a second resistor R2 and a capacitor C, and the second resistor R2 and the capacitor C are configured for filtering. In addition, in other embodiments of the present application, the battery protection circuit 100 may also include other circuits or electronic elements.
In the present embodiment, referring to fig. 1, the battery protection circuit 100 includes a power supply input terminal VDD, a power ground input terminal GND, an overcharge protection unit 110, an overdischarge protection unit 190, a discharge overcurrent protection unit 130, a reference voltage generation unit 140, a frequency generation unit 150, a control unit 160, a wake-up unit 170, and a first switch unit 180.
In this embodiment, the power supply terminal VDD and the power ground terminal GND are respectively used for electrically connecting with the positive electrode and the negative electrode of the battery 300, so that the battery 300 can supply power to the battery protection circuit 100, and meanwhile, the battery 300 forms a loop via the battery protection circuit 100 and the system circuit 200 to supply power to the system circuit 200.
In the embodiment, the overcharge voltage protection unit 110 is used to protect the battery 300 when detecting that the charge voltage is too high during the charging process of the battery 300, for example, stopping charging the battery 300, and so on, so as to prevent the battery 300 from being damaged or causing safety problems.
In the embodiment, the over-discharge voltage protection unit 190 is used for protecting the battery 300 when detecting that the discharge voltage is too low during the discharge process of the battery 300, for example, controlling the battery 300 to discharge only to the minimum extent, and generally stopping the power supply to the system circuit 200 and stopping the power supply to the circuits of the battery protection circuit 100 except the charge detection circuit, so as to prevent the battery 300 from being over-discharged and causing permanent damage to the battery 300.
In the embodiment, the discharge overcurrent protection unit 130 is used for protecting the battery 300 when detecting that the discharge current is too large during the discharge of the battery 300, for example, the battery 300 stops discharging, and the like, so as to prevent the battery 300 from being permanently damaged or causing a safety problem due to the too large discharge current. In the present embodiment, the discharge overcurrent protection unit 130 includes a plurality of sub-units, each of which is electrically connected to the control unit 160, and each of which is used for processing different discharge currents, and three sub-units are provided in the figure.
In the present embodiment, the reference voltage generating unit 140 is configured to generate a reference voltage required by the battery protection circuit 100, the frequency generating unit 150 is configured to generate different frequencies, and the control unit 160 is electrically connected to the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the reference voltage generating unit 140, the frequency generating unit 150, the first switching unit 180, and the like. In this embodiment, the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the reference voltage generation unit 140, the frequency generation unit 150, and the control unit 160 are conventional circuits in the art, and are not described herein again.
In this embodiment, the first switch unit 180 includes a switch transistor and a substrate control circuit, the switch transistor is an MOS transistor, a control end of the switch transistor is electrically connected to the control unit 160, the substrate control circuit is electrically connected to the control unit 160, and the substrate control circuit is configured to implement correct bias of a substrate of the switch transistor. However, the present application is not limited thereto, and in other embodiments of the present application, the first switch unit 180 may further include a charge switch and a discharge switch, where the charge switch and the discharge switch are both MOS transistors, and the charge switch and the discharge switch are respectively electrically connected to the control unit 160. In addition, in other embodiments of the present application, the first switch unit 180 may also be implemented in other forms, such as only one switch tube. In this embodiment, the first switch unit 180 is used to control the battery 300 to supply power to the system circuit 200, specifically, a loop is formed by the battery 300, the system circuit 200, and the first switch unit 180 of the battery protection circuit 100 to supply power to the battery protection circuit 100. Specifically, the control terminal of the first switch unit 180 is electrically connected to the control unit 160, the input terminal of the first switch unit 180 is electrically connected to the battery 300, for example, electrically connected to the power ground GND of the battery protection circuit 100, and the output terminal of the first switch unit 180 is electrically connected to the system circuit 200, so that the battery 300, the battery protection circuit 100, and the first switch unit 180 form a power supply loop, and the battery protection circuit 100 can control whether the battery 300 supplies power to the system circuit 200 by controlling the first switch unit 180.
In this embodiment, the battery protection circuit 100 is electrically connected to the system circuit 200, when the system circuit 200 outputs a first signal to the battery protection circuit 100, the battery protection circuit 100 enters a shipping mode, and in the shipping mode, the first switch unit 180 is turned off to stop the battery 300 from supplying power to the system circuit 200, specifically, after the battery protection circuit 100 receives the first signal, the control unit 160 controls the first switch unit 180 to be turned off.
In this embodiment, when the bluetooth headset needs long-distance transportation or long-time storage, the battery protection circuit 100 of the bluetooth headset can enter the shipping mode at this time, and in the shipping mode, the first switch unit 180 is turned off, so that the battery 300 cannot supply power to the system circuit 200, the electric quantity of the battery 300 can be greatly saved, and the electric quantity retention time of the battery 300 can be greatly prolonged under the condition that the capacity of the battery 300 of the bluetooth headset itself is very small. After the user takes the bluetooth headset, the user only needs to control the bluetooth headset to exit the shipping mode, for example, the bluetooth headset is started up and can exit the shipping mode, so that the user experience is improved, and the user is prevented from mistakenly considering the quality problem of the bluetooth headset.
In this embodiment, the battery protection circuit 100 further includes a shipping input terminal CTL, the shipping input terminal CTL is an additional input terminal of the battery protection circuit 100, the battery protection circuit 100 is electrically connected to the system circuit 200 through the shipping input terminal CTL, when the shipping input terminal CTL receives the first signal, the battery protection circuit 100 enters a shipping mode, and in the shipping mode, the first switching unit 180 is turned off to stop the power supply of the battery 300 to the system circuit 200. In this embodiment, the generation of the first signal may be implemented by software, or may be implemented by hardware, and when the generation is implemented by hardware, the generation may be implemented by, for example, a power key, a sound key, and the like of the bluetooth headset, for example, by pressing the power key for a long time. In addition, in other embodiments of the present application, the battery protection circuit 100 may also be electrically connected to the system circuit 200 through other terminal sharing, for example, the first signal is input through the power supply terminal VDD. In addition, in other embodiments of the present application, the battery protection circuit 100 may also be electrically connected to the system circuit 200 through other lines, for example, the first signal is input through the power supply terminal VDD.
In order to further limit the power retention time of the battery 300 of the bluetooth headset, in the present embodiment, at least some of the units of the battery protection circuit 100 are powered off in the ship mode. In the present embodiment, at least one of the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the control unit 160, the reference voltage generation unit 140, and the frequency generation unit 150 of the battery protection circuit 100 is stopped from being supplied with power, for example, one of the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the control unit 160, the reference voltage generation unit 140, and the frequency generation unit 150 is stopped from being supplied with power in the ship mode, or two of the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the control unit 160, the reference voltage generation unit 140, and the frequency generation unit 150 are stopped from being supplied with power in the ship mode, or the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the control unit 160, the reference voltage generation unit 140, and the frequency generation unit 150, Three of the control unit 160, the reference voltage generating unit 140 and the frequency generating unit 150 are stopped to supply power, …, or the overcharge voltage protecting unit 110, the overdischarge voltage protecting unit 190, the discharge overcurrent protecting unit 130, the control unit 160, the reference voltage generating unit 140 and the frequency generating unit 150 are stopped to supply power in the ship mode, which can greatly reduce the power consumption of the battery 300. In addition, in other embodiments of the present application, the battery protection circuit 100 further includes a temperature protection unit 410, a charging overcurrent protection unit 120, and the like, and the temperature protection unit 410 and the charging overcurrent protection unit 120 may not be powered or may be powered in the shipping mode, which is also a protection scope of the present application. In addition, in other embodiments of the present application, the battery protection circuit 100 may also be normally powered during normal use in the shipping mode.
In this embodiment, the battery protection circuit 100 further includes a wake-up unit, the wake-up unit 170 is continuously powered by the battery 300 during the shipping mode, and the wake-up unit 170 is configured to enable the battery protection circuit 100 to exit the shipping mode. In the present embodiment, the units of the charging protection circuit 100 except the wake-up unit 170 are all powered off. In this embodiment, the wake-up unit 170 is a charging detection unit, and the charging detection circuit is originally the circuit of the battery protection circuit 100, so that the design can save the cost. The charging detection unit is used for detecting whether the Bluetooth headset is connected to a power supply through a charger to charge the battery 300, and when the Bluetooth headset is connected to the power supply through the charger, the charging detection unit detects a charging signal to charge the battery 300; if the over-discharge voltage protection unit 190 protects the battery 300 and the charging detection unit detects the charging signal, the over-discharge voltage protection of the battery 300 is exited, that is, the system circuit 200 is powered and the battery protection circuit 100 is powered normally. In this embodiment, when the bluetooth headset is charged, the charging detection circuit detects the charging signal at this time, and the battery protection circuit 100 automatically exits the shipping mode, because the electric quantity of the battery 300 can be maintained for a long time, the bluetooth headset can be normally powered on for use. In addition, in other embodiments of the present application, the wake-up unit 170 may not be a charge detection circuit, but may also be another added hardware circuit dedicated to the purpose of enabling the battery protection circuit 100 to exit the shipping mode, and those skilled in the art may design the circuit according to specific requirements.
In the shipping mode, at least part of the units of the battery protection circuit 100 are stopped to supply power, so that the battery 300 only needs to supply power to a few circuit units such as the wake-up unit 170 of the battery protection circuit 100, the power consumption of the battery 300 is further reduced, the current consumption of the bluetooth headset can be reduced, the current consumption can be as low as several nA/h, the power retention time of the battery 300 can be prolonged, and the power of the battery 300 can be retained for half a year to one year in the shipping mode even if the capacity of the battery 300 of the bluetooth headset is relatively small.
In this embodiment, the shipping control signal is generated to enter the shipping mode by triggering the battery protection circuit 100 when the shipping input CTL receives the first signal. The present application is not so limited and in other embodiments of the present application, the battery protection circuit 100 may enter the ship mode directly when the ship input CTL receives the first signal.
In this embodiment, the first signal is a digital code signal, which is pre-agreed upon by the design of the battery protection circuit 100 and the system circuit, and when the encoded signal is received at the shipping input CTL, the battery protection circuit 100 generates a shipping control signal to enter the shipping mode. For example, the first signal includes two periods of time: the first time period is a high level signal, the second time period is a pulse signal of a predetermined number, where the high level signal is used to trigger an element corresponding to the battery protection circuit 100 to activate, for example, to tell the element corresponding to the battery protection circuit 100 to prepare to count or count, and then the element corresponding to the battery protection circuit 100 counts or counts the received pulse signal (for example, different pulse durations are different), when the number of pulses meets a preset requirement, the battery protection circuit 100 generates a shipping control signal, and when the number of pulses does not meet the preset requirement, the element corresponding to the battery protection circuit 100 returns to a state where activation is not started. Since the first signal is a coded signal of the battery protection circuit 100 and the protocol of the system circuit, the specific form of the first signal is not limited, either complex coding or simple coding is available, and the battery protection circuit 100 and the system circuit can be identified by the battery protection circuit 100 which is well agreed in advance. In addition, when the first signal is relatively complex, the battery protection circuit 100 is reliable and safe, and can prevent false triggering.
In the present embodiment, there are three ways to trigger the battery protection circuit 100 to generate the shipping control signal when the shipping input CTL receives the first signal, which are described below. Of course, the manner of triggering the battery protection circuit 100 to generate the shipping control signal when the shipping input CTL receives the first signal is not limited to the following three, and in other embodiments of the present application, a person skilled in the art may also set other conventional circuits to trigger the battery protection circuit 100 to generate the shipping control signal.
1. In an embodiment of the present application, please refer to fig. 1 and fig. 2, the first signal includes a pulse signal, and the battery protection circuit 100 further includes a pulse counting unit 420 and a third resistor R3. Here, the shipping input terminal CTL defaults to a low level, which is implemented by grounding the shipping input terminal CTL via the third resistor R3 in this embodiment, the pulse counting unit 420 outputs a low level signal under a normal condition, and the shipping input terminal CTL is electrically connected to the pulse counting unit 420. When the shipping input end CTL receives the first signal, the pulse counting unit 420 counts pulses, the pulse counting unit 420 counts by rising edge triggering, when the pulse count unit 420 receives a number of pulses greater than or equal to a first predetermined number within a first predetermined time period, the output signal of the pulse counting unit 420 is changed from a low level to a high level, the high level at this time is the shipping control signal, wherein the first predetermined time period and the first predetermined number are preset by the battery protection circuit 100, the first predetermined time period is, for example, 10 seconds, 5 seconds, 3 seconds, 1 second, and the like, and the first predetermined number is, for example, 3, 4, 5, and the like, so that the design can prevent false triggering. In the present embodiment, the output terminals of the pulse counting unit 420 are electrically connected to the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the reference voltage generation unit 140, the frequency generation unit 150, the control unit 160, and other units that need to be powered off, respectively, for powering off the units of the battery protection circuit 100 except the wake-up unit 170. In addition, in other embodiments of the present application, the output terminal of the pulse counting unit 420 outputs a high level under normal conditions, and the low level is a shipping control signal. In the present embodiment, the pulse counting unit 420 is provided separately from the control unit 160. In addition, in other embodiments of the present application, the pulse counting unit 420 may also be integrated into the control unit 160.
2. In another embodiment of the present application, referring to fig. 4 and 5, the first signal includes a continuous high level signal or a continuous low level signal, and the battery protection circuit 500 further includes a first timing unit 430 and a third resistor R3. Here, the ship input terminal CTL defaults to a low level, which is implemented by grounding the ship input terminal CTL via the third resistor R3 in this embodiment, the first timing unit 430 outputs a low level signal under a normal condition, and the ship input terminal CTL is electrically connected to the first timing unit 430. When the shipping input end CTL receives the first signal as a high level signal, that is, when the signal received by the shipping input end CTL changes from a low level to a high level, the first timing unit 430 triggers timing, and the first timing unit 430 performs timing by rising edge triggering, when the duration of the high level signal received by the first timing unit 430 is greater than or equal to a second predetermined time period T1, the output signal of the first timing unit 430 changes from a low level to a high level, and the high level signal at this time is the shipping control signal, where the second predetermined time period T1 is preset by the battery protection circuit 500, and the second predetermined time period T1 is, for example, 10 seconds, 5 seconds, 3 seconds, 1 second, and the like, and thus the design can prevent false triggering. In the present embodiment, the output terminals of the first timing unit 430 are electrically connected to the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the reference voltage generation unit 140, the frequency generation unit 150, the control unit 160, and other units that need to be powered off, respectively, so as to stop the power supply of the units of the battery protection circuit 500 except the wake-up unit 170. In addition, in other embodiments of the present application, the output terminal of the first timing unit 430 outputs a high-level signal under normal conditions, and the low-level signal is a shipping control signal. In the present embodiment, the first timing unit 430 is provided separately from the control unit 160. In addition, in other embodiments of the present application, the first timing unit 430 may also be integrated into the control unit 160.
3. In general, the conventional battery protection circuit 600, when the battery 300 is deeply discharged, at which time the conventional battery protection circuit 600 or the battery protection circuit detects the deep discharge of the battery 300 through the over-discharge voltage protection unit 190, the over-discharge voltage protection unit 190 sends a signal to the control unit 160, the control unit 160 passively controls the first switching unit 180 to be turned off, and passively controls the battery protection circuit 600 or the battery protection circuit other than the charge detection unit to be stopped from supplying power for protecting the battery 300, preventing the battery 300 from being damaged due to the over-discharge until the battery protection circuit 600 resumes supplying power after the charge detection unit detects the charge signal, and the first switching unit 180 is turned off to resume supplying power to the system circuit 200. In another embodiment of the present application, the original circuits and functions of the over-discharge voltage protection unit 190 in the prior art are fully utilized to actively control the first switch unit 180 to be turned off, and actively control the battery protection circuit 600 except for the charge detection unit to be powered off, so that the cost can be reduced. Specifically, referring to fig. 6-8, the over-discharge voltage protection unit 190 includes a comparator 191 and a second timing unit 192, the comparator 191 has a common terminal and two opposite terminals, the two opposite terminals are a first opposite terminal and a second opposite terminal respectively, an output terminal of the comparator 191 is electrically connected to the second timer, the common terminal of the comparator 191 is connected to a reference voltage, and the first opposite terminal of the comparator 191 is electrically connected to an output voltage detection point of the battery 300 for detecting whether the battery 300 is deeply discharged. The first signal includes a continuous high level signal, the battery protection circuit 600 further includes a second switch unit 440 and a first resistor R1, a control terminal of the second switch unit 440 is electrically connected to the ship input terminal CTL, an input terminal of the second switch unit 440 is grounded, an output terminal of the second switch unit 440 is electrically connected to one terminal of the first resistor R1, the other terminal of the first resistor R1 is connected to a high level, and an output terminal of the second switch unit 440 is also electrically connected to a second inverting terminal of the comparator 191 of the over-discharge voltage protection unit 190, wherein the first inverting terminal and the second inverting terminal have higher priority of low level, that is, when one of the first inverting terminal or the second inverting terminal is at a low level, the inverting terminal of the comparator 191 is at a low level. In this embodiment, when the shipping input terminal CTL receives the first signal, the second switch unit 440 is turned on, the second inverting terminal of the comparator 191 is grounded, the inverting terminal of the comparator 191 is at a low level, so that the comparator 191 outputs a high level, and the second timing unit 192 triggers generation of the shipping control signal when the duration of the received high level is greater than or equal to a third predetermined time period T2, where the shipping control signal is a high level signal. The control of the first switching unit 180 to be turned off is further implemented by using the existing over-discharge voltage protection unit 190, and the control of the battery protection circuit 600 except for the charge detection unit to be stopped from supplying power. The third predetermined time period T2 is preset by the battery protection circuit 600, and the third predetermined time period T2 is, for example, 10 seconds, 5 seconds, 3 seconds, etc., so that the design can prevent false triggering. In this embodiment, the second switching unit 440 is an NMOS transistor. However, the present application is not limited thereto, and in other embodiments of the present application, the second switching unit 440 may also be a PMOS transistor, in which case the first signal includes a continuous low signal.
In the present embodiment, referring to fig. 1, the battery protection circuit 100 further includes a system ground VM, the system ground VM is used for electrically connecting to the system circuit 200, and the system ground VM is also used for charging. In the present embodiment, the first switching unit 180 is disposed between the system ground VM and the power ground GND.
In this embodiment, the battery protection circuit 100 is fabricated on the same Chip, that is, the battery protection circuit 100 is integrally fabricated as a System On Chip (SOC), which is a technology commonly used in the field of integrated circuits, and aims to combine a plurality of integrated circuits with specific functions on one Chip to form a System or product, including a finished hardware System and embedded software carried by the System or product. The system on chip has obvious advantages in aspects of performance, cost, power consumption, reliability, life cycle, application range and the like. In addition, in other embodiments of the present application, the units of the battery protection circuit 100 except for the first switch unit 180 are all fabricated on the same chip, that is, the units of the battery protection circuit 100 except for the first switch unit 180 are integrally fabricated as a system on chip. In addition, in other embodiments of the present application, the second resistor R2 and the capacitor C in fig. 3 may also be implemented in a system on chip.
It should be understood that reference to "a plurality" herein means two or more. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

Claims (14)

1. A bluetooth headset, comprising:
a system circuit;
a battery having a capacity of 10mAH to 80 mAH;
a battery protection circuit, comprising: the power supply system comprises a power supply end, a power grounding end, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharge overcurrent protection unit, a reference voltage generation unit, a frequency generation unit, a control unit and a first switch unit, wherein the power supply end and the power grounding end are respectively electrically connected with a battery, and the first switch unit is used for controlling the battery to supply power to a system circuit;
the system circuit is electrically connected with the battery protection circuit, the battery protection circuit enters a shipping mode when the system circuit outputs a first signal to the battery protection circuit, and the first switch unit is switched off to enable the battery to stop supplying power to the system circuit in the shipping mode.
2. The bluetooth headset of claim 1, wherein the battery protection circuit includes a ship input, the ship input being electrically connected to the system circuit, the system circuit outputting the first signal through the ship input.
3. The bluetooth headset of claim 1, wherein the battery protection circuit further comprises a wake-up unit, at least some of the units of the battery protection circuit being powered off in the ship mode and powered on in the ship mode, the wake-up unit being configured to cause the battery protection circuit to exit the ship mode.
4. The bluetooth headset of claim 3, wherein the wakeup unit is a charge detection unit.
5. The bluetooth headset of claim 4, wherein the battery protection circuit exits the ship mode when the charge detection unit detects a charge signal.
6. The bluetooth headset according to claim 3, wherein at least one of the overcharge voltage protection unit, the overdischarge voltage protection unit, the discharge overcurrent protection unit, the control unit, the reference voltage generation unit, and the frequency generation unit is stopped from being supplied with power.
7. The bluetooth headset of claim 6, wherein the circuits of the battery protection circuit other than the wakeup unit are powered down when the battery protection circuit enters the ship mode.
8. The bluetooth headset of any of claims 1-7, wherein the battery protection circuit is triggered to generate a shipping control signal to enter a shipping mode when the battery protection circuit receives the first signal.
9. The bluetooth headset of claim 8, wherein the first signal is an encoded signal that the battery protection circuit is in protocol with system circuitry.
10. The bluetooth headset of claim 9, wherein the first signal comprises a pulse signal, the battery protection circuit further comprising a pulse counting unit electrically connected to the ship input, the pulse counting unit triggering generation of a ship control signal when a number of pulses received by the pulse counting unit within a first predetermined time period is greater than or equal to a first predetermined number.
11. The bluetooth headset of claim 9, wherein the first signal comprises a continuous high signal or a continuous low signal, and the battery protection circuit further comprises a first timing unit electrically connected to the ship input terminal, wherein the first timing unit triggers generation of the ship control signal when the duration of the high signal or the low signal received by the first timing unit is greater than or equal to a second predetermined time period.
12. The bluetooth headset as claimed in claim 9, wherein the over-discharge voltage protection unit includes a comparator and a second timing unit, an output terminal of the comparator is electrically connected to the second timing unit, the first signal is a continuous high level signal or a continuous low level signal, the battery protection circuit further includes a second switching unit and a first resistor, a control terminal of the second switching unit is electrically connected to the shipping pin, an input terminal of the second switching unit is grounded, an output terminal of the second switching unit is electrically connected to one terminal of the first resistor, the other terminal of the first resistor is connected to a high level, an output terminal of the second switching unit is also electrically connected to a reverse terminal of the comparator of the over-discharge voltage protection unit, an output terminal of the comparator is electrically connected to the second timing unit, and the second switching unit is turned on when the shipping pin receives the first signal, and when the high level duration received by the second timing unit is greater than or equal to a third preset time period, the ship control signal is triggered and generated.
13. The bluetooth headset according to any one of claims 1 to 7, wherein the first switching unit includes a MOS transistor.
14. The bluetooth headset according to any one of claims 1 to 7, wherein the battery protection circuit is formed on the same chip, or wherein units of the battery protection circuit other than the first switching unit are formed on the same chip.
CN202010880048.1A 2020-08-27 Bluetooth earphone Active CN112039152B (en)

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CN202010880048.1A CN112039152B (en) 2020-08-27 Bluetooth earphone
PCT/CN2021/115169 WO2022042708A1 (en) 2020-08-27 2021-08-27 System-on-chip, battery assembly, electronic device, battery protection circuit, test subsystem, test system, bluetooth earphone, shipping mode setting method, and computer readable storage medium

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CN112039152B CN112039152B (en) 2022-10-21

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