CN117998260A - Power management circuit and bluetooth speaker - Google Patents

Power management circuit and bluetooth speaker Download PDF

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Publication number
CN117998260A
CN117998260A CN202211338126.0A CN202211338126A CN117998260A CN 117998260 A CN117998260 A CN 117998260A CN 202211338126 A CN202211338126 A CN 202211338126A CN 117998260 A CN117998260 A CN 117998260A
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CN
China
Prior art keywords
unit
power management
resistor
storage unit
power
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Pending
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CN202211338126.0A
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Chinese (zh)
Inventor
侯俊
黄连福
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Shenzhen Ape Core Semiconductor Co ltd
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Shenzhen Ape Core Semiconductor Co ltd
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Priority to CN202211338126.0A priority Critical patent/CN117998260A/en
Publication of CN117998260A publication Critical patent/CN117998260A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a power management circuit and a Bluetooth loudspeaker, comprising a power management unit, an input unit, a power storage unit and an output unit; the power management unit is connected with the input unit, the power storage unit and the output unit; the input unit is connected with the electricity storage unit; when the input unit charges the electricity storage unit, the voltage difference inside the electricity storage unit gradually increases linearly from zero; the power management unit judges whether the voltage difference in the power storage unit is larger than a preset voltage difference threshold value; when the voltage difference in the power storage unit is larger than a preset voltage difference threshold value, the power management unit controls the output unit to be in a normal working state; when the voltage difference inside the power storage unit is not larger than a preset voltage difference threshold value, the power management unit controls the output unit to be in an under-voltage locking state. In the scheme, the fluctuation of the input unit or the abnormality of the whole circuit can only lead the output unit to be in a normal state or an under-voltage state, so that the voltage of the output end can be kept stable.

Description

Power management circuit and bluetooth speaker
Technical Field
The present invention relates to the field of power management, and in particular, to a power management circuit and a bluetooth speaker.
Background
The bluetooth speaker belongs to portable small-size accessory, receives the space restriction, and is higher to the sensitivity of parameter such as voltage or heat dissipation in the aspect of the performance, therefore when playing, need to maintain a steady operating condition.
The existing Bluetooth speaker is mainly used for carrying out charging management through a power management circuit, but the voltage of an input unit is not easy to keep stable, so that the voltage of an output end is possibly unstable, and the working state of the whole Bluetooth speaker is affected. Therefore, how to solve the unstable voltage of the output end of the bluetooth speaker has become a technical problem to be solved in industry.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to design a power management circuit, the voltage of the output terminal can be kept stable.
In order to solve the above-mentioned problems, an embodiment of the present invention provides a power management circuit and a bluetooth speaker, in which the state of a power storage unit is controlled by the power management unit, in the process that the voltage difference inside the power storage unit gradually increases linearly from zero, the power management unit determines whether the voltage difference inside the power storage unit is greater than a preset voltage difference threshold, and controls an output unit to be in a stable normal working state or in a completely non-output under-voltage locking state according to the determination result, that is, the fluctuation of the input unit or the abnormality of the whole circuit only causes the output unit to be in a normal state or an under-voltage state, so that the voltage of an output end can be kept stable.
In a first aspect, an embodiment of the present invention provides a power management circuit, including: the power supply management unit, the input unit, the electricity storage unit and the output unit; the power management unit is connected with the input unit, the electricity storage unit and the output unit; the input unit is connected with the electricity storage unit; when the input unit charges the electricity storage unit, the voltage difference inside the electricity storage unit gradually and linearly increases from zero; the power management unit judges whether the voltage difference inside the power storage unit is larger than a preset voltage difference threshold value; when the voltage difference inside the power storage unit is larger than a preset voltage difference threshold value, the power management unit controls the output unit to be in a normal working state; when the voltage difference inside the power storage unit is not larger than a preset voltage difference threshold value, the power management unit controls the output unit to be in an under-voltage locking state.
The power management system comprises a power management unit, a power storage unit, a filtering unit and a power supply control unit.
The low-power detection device comprises a power management unit, and is characterized by further comprising a low-power detection unit, wherein the low-power detection unit is connected with the power management unit, and the low-power detection unit is connected with the power storage unit.
The further technical scheme is that the electricity storage unit comprises a first capacitor, a battery and a state detection unit; one end of the first capacitor is connected with the power management unit and the anode of the battery; the other end of the first capacitor is grounded; the positive electrode of the battery is connected with the power management unit; the negative electrode of the battery is connected with the state detection unit; the low-electricity detection unit is connected with the negative electrode of the battery; the low-power detection unit is connected with the state detection unit.
The state detection unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a diode and a first PMOS tube; the input unit comprises an input end; the input end is connected with the power management unit; the negative electrode of the battery is connected with the first resistor; the first resistor is connected with the second resistor; the second resistor is connected with the third resistor; the third resistor is connected with the anode of the diode; the cathode of the diode is connected with the fourth resistor; the D pole of the first PMOS tube is connected with the low-electricity detection unit; the D pole of the first PMOS tube is connected with the positive pole of the battery; the D pole of the first PMOS tube is connected with the fourth resistor; the S pole of the first PMOS tube is connected with the filtering unit; the S pole of the first PMOS tube is connected with the cathode of the diode; the S pole of the first PMOS tube is connected with the fourth resistor; the G pole of the first PMOS tube is connected with the first resistor; the G pole of the first PMOS tube is connected with the second resistor; the input end is connected with the second resistor; the input end is connected with the third resistor.
The further technical scheme is that the output unit comprises a first switch, a second PMOS tube, an output end, a fifth resistor, a second capacitor and a third capacitor; the D pole of the second PMOS tube is connected with the output end; the S pole of the second PMOS tube is connected with the power management unit; the G pole of the second PMOS tube is connected with the first switch; one end of the fifth resistor is connected with the S electrode of the second PMOS tube; the other end of the fifth resistor is connected with the first switch; one end of the second capacitor is connected with the S electrode of the second PMOS tube; the other end of the second capacitor is grounded; one end of the third capacitor is connected with the S pole of the second PMOS tube; the other end of the third capacitor is grounded.
The further technical scheme is that the filtering unit comprises an inductor and a fourth capacitor; one end of the inductor is connected with the power management unit, and the other end of the inductor is connected with the anode of the fourth capacitor; and the negative electrode of the fourth capacitor is grounded.
The low-power detection unit comprises a detection end, a sixth resistor, a seventh resistor and an LED display lamp; one end of the sixth resistor is connected with the detection end, and the other end of the sixth resistor is connected with the electricity storage unit; one end of the seventh resistor is connected with the detection end, and the other end of the seventh resistor is connected with the LED display lamp and grounded; the LED display lamp is connected with the power management unit.
The further technical proposal is that the device also comprises a second switch; the second switch is connected with the power management unit.
In a second aspect, an embodiment of the present invention proposes a bluetooth speaker, which includes a power management circuit according to the first aspect.
The invention provides a power management circuit and a Bluetooth loudspeaker, wherein the state of a power storage unit is controlled by the power management unit, in the process that the voltage difference in the power storage unit gradually increases linearly from zero, the power management unit judges whether the voltage difference in the power storage unit is larger than a preset voltage difference threshold value, and controls an output unit to be in a stable normal working state or in an undervoltage locking state without output according to a judging result, namely, the fluctuation of the input unit or the abnormality of the whole circuit only leads the output unit to be in a normal state or an undervoltage state, so that the voltage of an output end can be kept stable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit block diagram of a power management circuit according to an embodiment of the present invention.
Fig. 2 is a partial circuit diagram of a power management circuit according to an embodiment of the invention.
Fig. 3 is another partial circuit diagram of a power management circuit according to an embodiment of the present invention.
Fig. 4 is another circuit block diagram of a power management circuit according to an embodiment of the present invention.
Fig. 5 is a circuit block diagram of a power management circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, in which like reference numerals represent like components. It will be apparent that the embodiments described below are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the invention. As used in the specification of the embodiments of the invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Examples
Referring to fig. 1 to 5, a power management circuit according to an embodiment of the present invention includes a power management unit 10, an input unit 20, a power storage unit 30, and an output unit 40; the power management unit 10 is connected with the input unit 20, the power storage unit 30, and the output unit 40; the input unit 20 is connected with the power storage unit 30; when the input unit 20 charges the power storage unit 30, the voltage difference inside the power storage unit 30 gradually increases linearly from zero; the power management unit 10 determines whether the voltage difference inside the power storage unit 30 is greater than a preset voltage difference threshold; when the voltage difference inside the power storage unit 30 is greater than a preset voltage difference threshold, the power management unit 10 controls the output unit 40 to be in a normal working state; when the voltage difference inside the power storage unit 30 is not greater than the preset voltage difference threshold, the power management unit 10 controls the output unit 40 to be in the under-voltage locking state.
The power management unit 10 is a JH8500 serial chip, and the power management unit 10 is configured to implement a core control function of the whole power management circuit. The voltage of the input unit 20 may be 5V, and may achieve a voltage input of 4.5V-5.5V, or may achieve a voltage input of 4.9V-5.1V. In an embodiment, as the power-on time of the input unit 20 becomes longer, the voltage difference inside the power storage unit 30 gradually increases. The change in state of the power storage unit 30 causes a change in state in which the power management unit 10 drives the output unit 40. When the voltage difference inside the power storage unit 30 is greater than a preset voltage difference threshold, the power storage unit 30 outputs a high-level signal to the power management unit 10, and the power management unit 10 controls the output unit 40 to be in a normal working state; when the voltage difference inside the power storage unit 30 is not greater than the preset voltage difference threshold, the power storage unit 30 does not output a high level signal to the power management unit 10, and the power management unit 10 controls the output unit 40 to be in an under-voltage locking state.
In an embodiment, the preset voltage difference threshold is 3V; the internal integration of the power management unit 10 with an output booster and a linear charger, once the circuit is enabled, the output booster will boost the output voltage of the output unit 40 to 5V; when the input USB voltage of the input unit 20 is available, the linear charger of the power management unit 10 will start charging the battery inside the power storage unit 30 until the battery is fully charged to 4.2V. Wherein, the power management unit 10 is provided with an under-voltage locking function, the battery charge in the power storage unit 30 is linearly increased to 3V from zero, during which the power management unit 10 controls the output unit 40 to be in an under-voltage locking state, and the output unit 40 is stabilized in a non-working state; the power management unit 10 controls the output unit 40 to be in a normal operation state during the process of charging the battery inside the power storage unit 30 to 4.2V after exceeding 3V, and the output unit 40 outputs a stable voltage of 5V. The circuit converts the battery inside the power storage unit 30 from maximum 4.2V to 5V of the output unit 40, and also realizes the boosting function.
The power supply management unit judges whether the voltage difference inside the power storage unit is larger than the preset voltage difference threshold value or not in the process of gradually and linearly increasing the voltage difference inside the power storage unit from zero through the power supply management unit, and controls the output unit to be in a stable normal working state or in an undervoltage locking state without output completely according to the judging result, namely, the fluctuation of the input unit or the abnormality of the whole circuit only leads to the output unit to be in a normal state or an undervoltage state, so that the voltage of the output end can be kept stable.
Further, referring specifically to fig. 3-4, the power management circuit further includes a filter unit 50, where the filter unit 50 is connected to the power management unit 10, and the filter unit 50 is connected to the power storage unit 30. The filtering unit 50 is connected to the power storage unit 30, and is configured to receive a high-level signal sent by the power storage unit 30. The filtering unit 50 is connected to the power management unit 10, and is configured to control a state change of the power management unit 10 in cooperation with the power storage unit 30. The technical effect is that the filtering unit 50 can realize the filtering function of the circuit in the process of controlling the state change of the power management unit 10 by the power storage unit 30.
Further, the power management circuit further includes a low-power detection unit 60, the low-power detection unit 60 is connected to the power management unit 10, and the low-power detection unit 60 is connected to the power storage unit 30. Wherein the low-power detection unit 60 is connected to the power management unit 10, i.e. the state of the power management unit 10 can be sensed by the low-power detection unit 60. In an embodiment, the low-voltage detection unit 60 is connected to the power storage unit 30, and the low-voltage detection unit 60 may detect whether the voltage inside the power storage unit 30 is too low. The technical effect is that the low-power detection of the power management circuit can be realized by the low-power detection unit 60.
Further, the power storage unit 30 of the power management circuit includes a first capacitor C1, a battery BAT, and a state detection unit 31; the power management unit 10 includes a VDD pin and an IN pin; one end of the first capacitor C1 is connected to the VDD pin of the power management unit 10 and the positive electrode of the battery BAT; the other end of the first capacitor C1 is grounded; the positive electrode of the battery BAT is connected with the VDD pin of the power management unit 10; the negative electrode of the battery BAT is connected to the state detection unit 31; the low-electricity detecting unit 60 is connected to the negative electrode of the battery BAT; the low-power detection unit 60 is connected to the state detection unit 31. Wherein, the battery BAT can be a lithium battery or a lead-acid battery; the positive electrode of the battery BAT is directly connected to the VDD pin of the power management unit 10. The technical effect is that the input unit 20, the power management unit 10, the battery BAT, and the state detection unit 31 may be implemented through the battery BAT, thereby implementing power supply for subsequent circuits.
Further, referring specifically to fig. 2-3, the state detecting unit 31 of the power management circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode D1, and a first PMOS transistor Q1; the input unit 20 includes an input terminal IP; the input end IP is connected with an IN pin of the power management unit 10; the negative electrode of the battery BAT is connected with the first resistor R1; the first resistor R1 is connected with the second resistor R2; the second resistor R2 is connected with the third resistor R3; the third resistor R3 is connected with the anode of the diode D1; the cathode of the diode D1 is connected with the fourth resistor R4; the D pole of the first PMOS tube Q1 is connected with the low-electricity detection unit 60; the D pole of the first PMOS tube Q1 is connected with the positive pole of the battery BAT; the D pole of the first PMOS tube Q1 is connected with the fourth resistor R4; the S pole of the first PMOS tube Q1 is connected with the filtering unit 50; the S pole of the first PMOS tube Q1 is connected with the cathode of the diode D1; the S electrode of the first PMOS tube Q1 is connected with the fourth resistor R4; the G pole of the first PMOS tube Q1 is connected with the first resistor R1; the G pole of the first PMOS tube Q1 is connected with the second resistor R2; the input end IP is connected with the second resistor R2; the input terminal IP is connected to the third resistor R3.
The current conducting direction of the first PMOS transistor Q1 is from the S pole of the first PMOS transistor Q1 to the D pole of the first PMOS transistor Q1, and the current flows to the power management unit 10 through the fourth resistor R4. In an embodiment, when the voltage difference inside the battery BAT is greater than a preset voltage difference threshold value of 3V, the first PMOS transistor Q1 is in a conducting state, and signals are transmitted to the power management unit 10, where the power management unit 10 includes an SW pin and an OUT pin, and the two pins are turned on and turned off simultaneously when they are turned on; when the first PMOS transistor Q1 is in the on state, the SW pin is turned on, and the power management unit 10 controls the OUT pin to be turned on, so that the output unit 40 is in a normal working state.
Further, the output unit 40 of the power management circuit includes a first switch SW1, a second PMOS transistor Q2, an output terminal OP, a fifth resistor R5, a second capacitor C2, and a third capacitor C3; the power management unit 10 further includes an OUT pin; the D pole of the second PMOS tube Q2 is connected with the output end OP; the S pole of the second PMOS tube Q2 is connected with the OUT pin of the power management unit 10; the G pole of the second PMOS tube Q2 is connected with the first switch SW 1; one end of the fifth resistor R5 is connected with the S electrode of the second PMOS tube Q2; the other end of the fifth resistor R5 is connected with the first switch SW 1; one end of the second capacitor C2 is connected with the S electrode of the second PMOS tube Q2; the other end of the second capacitor C2 is grounded; one end of the third capacitor C3 is connected with the S pole of the second PMOS tube Q2; the other end of the third capacitor C3 is grounded. The second PMOS transistor Q2 in the output unit 40 is connected to the OUT pin of the power management unit 10, and the state of the output unit 40 is controlled by the power management unit 10, and since the state of the power management unit 10 has only two conditions of high level or low level, the state of the output unit 40 has only two conditions of high level or low level, so that the voltage stability of the output terminal OP is achieved.
Further, referring specifically to fig. 5, the filtering unit 50 of the power management circuit includes an inductor L1 and a fourth capacitor C4; the power management unit 10 further includes a SW pin; one end of the inductor L1 is connected with the SW pin of the power management unit 10, and the other end of the inductor L1 is connected with the positive electrode of the fourth capacitor C4; the negative electrode of the fourth capacitor C4 is grounded. The technical effect is that, in the process of controlling the state change of the power management unit 10 by the power storage unit 30, the inductor L1 in the filtering unit 50 can realize direct current and alternating current resistance, and the fourth capacitor C4 is grounded to realize direct current and alternating current resistance, so that the signal received by the power management unit 10 is stable, i.e. the filtering function of the circuit is realized.
Further, the low-power detection unit 60 of the power management circuit includes a detection end DE, a sixth resistor R6, a seventh resistor R7, and an LED display lamp D2; the power management unit 10 further comprises LED pins; one end of the sixth resistor R6 is connected to the detection end DE, and the other end of the sixth resistor R6 is connected to the electricity storage unit 30; one end of the seventh resistor R7 is connected with the detection end DE, and the other end of the seventh resistor R7 is connected with the LED display lamp D2 and grounded; the LED display lamp D2 is connected with the LED pins of the power management unit 10. The power management circuit has the technical effects that the low-power detection unit 60 can be used for realizing the low-power detection of the power management circuit, and the seventh resistor R7 and the LED display lamp D2 are matched to enable a user to observe whether the circuit is in a low-power state or not through the LED display lamp D2.
Further, the power management circuit further includes a second switch SW2; the power management unit 10 further includes an ENB foot; the second switch SW2 is connected to the ENB pin of the power management unit 10. Wherein, when the second switch SW2 is turned on, the power management unit 10 is turned on. The technical effect is that the second switch SW2 can be used to control the power management unit 10 independently, and the whole power management circuit is in an off state when the second switch SW2 is turned off.
Further, the invention also provides a Bluetooth speaker, which comprises the power management circuit according to any embodiment. The existing Bluetooth speaker is mainly used for carrying out charging management through a power management circuit, but the voltage of an input unit is not easy to keep stable, so that the voltage of an output end is possibly unstable, and the working state of the whole Bluetooth speaker is affected. The Bluetooth speaker comprises a power management unit, wherein the power management unit is used for controlling the state of a power storage unit, and in the process that the voltage difference in the power storage unit gradually increases linearly from zero, the power management unit is used for judging whether the voltage difference in the power storage unit is larger than a preset voltage difference threshold value or not, and controlling the output unit to be in a stable normal working state or in an undervoltage locking state without output according to a judging result, namely, the fluctuation of the input unit or the abnormality of the whole circuit only leads the output unit to be in a normal state or an undervoltage state, so that the voltage of an output end is kept stable, and the power supply obtained by the Bluetooth speaker is kept stable.
In summary, the present invention provides a power management circuit and a bluetooth speaker, in which the state of a power storage unit is controlled by the power management unit, in the process that the voltage difference inside the power storage unit gradually increases linearly from zero, the power management unit determines whether the voltage difference inside the power storage unit is greater than a preset voltage difference threshold, and controls an output unit to be in a stable normal working state or in a completely non-output under-voltage locking state according to the determination result, that is, the fluctuation of the input unit or the abnormality of the whole circuit only causes the output unit to be in a normal state or an under-voltage state, so that the voltage of an output terminal can be kept stable.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be attached, detached, or integrated, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, one skilled in the art can combine and combine the different embodiments or examples described in this specification.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. A power management circuit, comprising:
the power supply management unit, the input unit, the electricity storage unit and the output unit;
the power management unit is connected with the input unit, the electricity storage unit and the output unit; the input unit is connected with the electricity storage unit;
When the input unit charges the electricity storage unit, the voltage difference inside the electricity storage unit gradually and linearly increases from zero; the power management unit judges whether the voltage difference inside the power storage unit is larger than a preset voltage difference threshold value;
when the voltage difference inside the power storage unit is larger than a preset voltage difference threshold value, the power management unit controls the output unit to be in a normal working state;
When the voltage difference inside the power storage unit is not larger than a preset voltage difference threshold value, the power management unit controls the output unit to be in an under-voltage locking state.
2. The power management circuit of claim 1, wherein:
the power supply management unit is connected with the power supply management unit, and the power supply management unit is connected with the power storage unit.
3. The power management circuit of claim 2, wherein:
The low-electricity detection unit is connected with the power management unit, and the low-electricity detection unit is connected with the electricity storage unit.
4. A power management circuit according to claim 3, wherein:
the power storage unit comprises a first capacitor, a battery and a state detection unit; one end of the first capacitor is connected with the power management unit and the anode of the battery; the other end of the first capacitor is grounded; the positive electrode of the battery is connected with the power management unit; the negative electrode of the battery is connected with the state detection unit; the low-electricity detection unit is connected with the negative electrode of the battery; the low-power detection unit is connected with the state detection unit.
5. The power management circuit of claim 4, wherein:
the state detection unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a diode and a first PMOS tube; the input unit comprises an input end; the input end is connected with the power management unit; the negative electrode of the battery is connected with the first resistor; the first resistor is connected with the second resistor; the second resistor is connected with the third resistor; the third resistor is connected with the anode of the diode; the cathode of the diode is connected with the fourth resistor;
The D pole of the first PMOS tube is connected with the low-electricity detection unit; the D pole of the first PMOS tube is connected with the positive pole of the battery; the D pole of the first PMOS tube is connected with the fourth resistor; the S pole of the first PMOS tube is connected with the filtering unit; the S pole of the first PMOS tube is connected with the cathode of the diode; the S pole of the first PMOS tube is connected with the fourth resistor; the G pole of the first PMOS tube is connected with the first resistor; the G pole of the first PMOS tube is connected with the second resistor; the input end is connected with the second resistor; the input end is connected with the third resistor.
6. The power management circuit of claim 5, wherein:
The output unit comprises a first switch, a second PMOS tube, an output end, a fifth resistor, a second capacitor and a third capacitor; the D pole of the second PMOS tube is connected with the output end; the S pole of the second PMOS tube is connected with the power management unit; the G pole of the second PMOS tube is connected with the first switch; one end of the fifth resistor is connected with the S electrode of the second PMOS tube; the other end of the fifth resistor is connected with the first switch; one end of the second capacitor is connected with the S electrode of the second PMOS tube; the other end of the second capacitor is grounded; one end of the third capacitor is connected with the S pole of the second PMOS tube; the other end of the third capacitor is grounded.
7. The power management circuit of claim 2, wherein:
The filtering unit comprises an inductor and a fourth capacitor; one end of the inductor is connected with the power management unit, and the other end of the inductor is connected with the anode of the fourth capacitor; and the negative electrode of the fourth capacitor is grounded.
8. A power management circuit according to claim 3, wherein:
The low-electricity detection unit comprises a detection end, a sixth resistor, a seventh resistor and an LED display lamp; one end of the sixth resistor is connected with the detection end, and the other end of the sixth resistor is connected with the electricity storage unit; one end of the seventh resistor is connected with the detection end, and the other end of the seventh resistor is connected with the LED display lamp and grounded; the LED display lamp is connected with the power management unit.
9. The power management circuit of claim 1, wherein:
The second switch is also included; the second switch is connected with the power management unit.
10. A bluetooth speaker, characterized in that it comprises a power management circuit according to any of claims 1-9.
CN202211338126.0A 2022-10-28 2022-10-28 Power management circuit and bluetooth speaker Pending CN117998260A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211338126.0A CN117998260A (en) 2022-10-28 2022-10-28 Power management circuit and bluetooth speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211338126.0A CN117998260A (en) 2022-10-28 2022-10-28 Power management circuit and bluetooth speaker

Publications (1)

Publication Number Publication Date
CN117998260A true CN117998260A (en) 2024-05-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211338126.0A Pending CN117998260A (en) 2022-10-28 2022-10-28 Power management circuit and bluetooth speaker

Country Status (1)

Country Link
CN (1) CN117998260A (en)

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