CN213637159U - Sound box power supply system and sound box - Google Patents
Sound box power supply system and sound box Download PDFInfo
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- CN213637159U CN213637159U CN202022819029.6U CN202022819029U CN213637159U CN 213637159 U CN213637159 U CN 213637159U CN 202022819029 U CN202022819029 U CN 202022819029U CN 213637159 U CN213637159 U CN 213637159U
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Abstract
The utility model discloses a sound box power supply system and a sound box, which comprises a power management module, a charging interface, a battery, a first boost converter and a second boost converter; the first boost converter is used for performing boost conversion on the power supply output by the power supply management module to generate a power supply for power amplification and transmitting the power supply to a power amplification chip for driving a loudspeaker in the sound box; when the voltage output by the battery through the power management module is greater than or equal to the output voltage set for the second boost converter, the second boost converter is used as a bypass branch circuit, and the voltage output by the power management module is directly transmitted to a control system in the sound box; when the voltage output by the battery through the power management module is lower than the output voltage set for the second boost converter, the second boost converter boosts the voltage output by the power management module to the set output voltage, and transmits the voltage to the control system in the sound box. The utility model discloses a reduce the multistage transform of electric energy, realized the maximize utilization of battery electric energy.
Description
Technical Field
The utility model belongs to the technical field of the audio amplifier, specifically speaking relates to a power supply system's in audio amplifier product circuit design.
Background
In a consumer electronic sound box product, a control system (MCU platform) has a high requirement on the quality of a power supply system, and generally requires a relatively stable low-voltage power supply. The loudspeaker end of the sound box belongs to a large dynamic load, and needs large dynamic energy, so that high direct current power supply is required. In a power supply system of a sound box product, different voltage inputs need to be provided for a control system and a loudspeaker end, and especially for the sound box product adopting a battery as a power supply, the problems of reducing energy loss, ensuring endurance time and the like need to be considered.
Fig. 1 is a circuit design of a power supply system commonly used for an existing smart speaker using a battery as a power supply, and the power supply system includes a battery, a power management module, a boost converter, a buck converter, and other main components. When the charging interface is externally connected with a power adapter, the power management module can perform voltage reduction transformation on direct current power supply provided by the power adapter and then transmit the direct current power supply to the battery to charge and store energy for the battery; meanwhile, the power supply output by the power supply management module can be transmitted to the boost converter, and after the power supply is boosted to a +12V direct-current power supply by the boost converter, one path of the power supply supplies power to a power amplifier chip in the loudspeaker box so as to push the loudspeaker to play music; and the other path of the direct current is transmitted to a buck converter, and the +12V direct current power supply is converted into a +4V direct current power supply through the buck converter to supply power for the control system.
In the single battery power supply mode, the battery voltage VBAT is output through the power management module, is boosted to +12V through the boost converter to supply power for the power amplifier chip, and is transmitted to the buck converter to be further converted into a +4V direct-current power supply to supply power for the control system. According to the design scheme of the power supply system, the electric energy can reach the control system only through two-stage conversion of the boost converter and the buck converter, so that the power supply efficiency from the battery to the control system is low, and the standby time and the working time of a sound box product are seriously influenced. Moreover, the electric energy is converted in multiple stages, the generated heat is high, and a user often feels hot and hot in the using process, so that the user experience is poor.
Disclosure of Invention
An object of the utility model is to provide a sound box power supply system through the multistage transform that reduces the electric energy to realize the maximize utilization of battery electric energy.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
in one aspect, the utility model provides a sound box power supply system, which comprises a power management module, a charging interface connected with the power management module, a battery, a first boost converter and a second boost converter; the first boost converter is used for performing boost conversion on the power supply output by the power supply management module to generate a power supply for power amplification, and the power supply is transmitted to a power amplification chip for driving a loudspeaker in the sound box; when the voltage output by the battery through the power management module is greater than or equal to the output voltage set for the second boost converter, the second boost converter is used as a bypass branch circuit, and the voltage output by the power management module is directly transmitted to a control system in the sound box; when the voltage output by the battery through the power management module is lower than the output voltage set for the second boost converter, the second boost converter boosts the voltage output by the power management module to be converted into the set output voltage, and transmits the set output voltage to the control system in the sound box.
In some embodiments of the present application, a diode is further disposed in the sound box power supply system, an anode of the diode is connected to the charging interface, and a cathode of the diode is connected to the power amplifier chip; when the charging interface is externally connected with the power adapter, the diode is conducted, and power output by the power adapter is transmitted to the power amplifier chip to supply power to the power amplifier chip. By adopting the circuit design, when the sound box is externally connected with the power adapter, the power adapter can be utilized to directly supply power for the power amplifier chip so as to realize the high-power and high-volume output of the loudspeaker. Meanwhile, the energy of the battery can be saved, and the reasonable utilization of the electric quantity of the battery is realized. The diode is configured, so that the power supply output by the first booster circuit can be prevented from flowing backwards to the power supply management module in a single battery power supply mode, and the power supply management module cannot normally operate.
In some embodiments of the present application, it is preferable that the voltage of the power supply for power amplification output by the first boost converter is configured to be smaller than the power supply voltage output by the power adapter. Therefore, when the sound box is externally connected with the power adapter, the power adapter can be automatically switched to supply power for the power amplifier chip, and the auxiliary switching of the control system is not needed.
In some embodiments of the present application, when the input voltage range supported by the power amplifier chip is between V1 and V2, it is preferable to configure the power voltage output by the power adapter to be V2, so as to ensure that the speaker can output at maximum power and maximum volume; and the voltage V of the power supply for power amplification output by the first boost converterBoost1Preferably, V is set to be V1 ≦ VBoost1< V2 to realize the automatic switching of two power supplies.
In some embodiments of the present application, in order to utilize the battery power to the maximum extent, it is preferable to configure the control system to output an enable signal when the sound box enters the standby mode, and control the first boost converter to stop outputting the power supply for power amplification, so as to reduce power consumption and prolong the standby time and the operating time of the sound box.
In some embodiments of the present application, a switch tube is disposed in the first boost converter and is used for selectively outputting the power supply for power amplification generated by conversion of the first boost converter, and an enable signal output by the control system is used for controlling on/off of the switch tube. By adopting the circuit design, when the sound box is in standby, the power output of the first boost converter is cut off by controlling the switching tube to be switched off, so that the design requirement is met.
In some embodiments of the present application, the switch tube preferably adopts a PMOS tube, and the source of the switch tube is connected to the power supply for power amplification generated by conversion of the first boost converter, and is connected to the gate of the switch tube through a first voltage dividing resistor; and the drain electrode of the PMOS tube is connected with the power amplifier chip, the grid electrode of the PMOS tube is connected with the collector electrode of an NPN type triode through a second divider resistor, the emitter electrode of the NPN type triode is grounded, the base electrode of the NPN type triode is connected with the control system, the enabling signal is received, and the PMOS tube is controlled to be switched on and off by controlling the on-off state of the NPN type triode.
In some embodiments of the present application, a step-down converter is further disposed in the sound box power supply system, and is connected to the charging interface, and when the charging interface is externally connected to the power adapter, the power output by the power adapter is subjected to step-down conversion, and then transmitted to the control system in the sound box, so that the control system supplies power. By adopting the circuit design, when the sound box is externally connected with the power adapter, the power adapter can be utilized to directly supply power for the control system, so that the energy consumption of the battery is avoided, and the reasonable utilization of the electric quantity of the battery is realized.
In some embodiments of the present application, when the control system supports an input voltage range between V3-V4; it is preferable to configure the output voltage of the second boost converter to be VBoost2And V is not less than V3Boost2< V4; the output voltage of the buck converter is VBuckAnd V isBoost2＜VBuckV4 is less than or equal to. Therefore, when the sound box is externally connected with the power adapter, the power adapter can be automatically switched to supply power to the control system, the control system does not need to be switched in an auxiliary mode, and software programming is simplified.
In another aspect, the present invention further provides a sound box, which includes a control system, a speaker, a power amplifier chip for driving the speaker, and a sound box power supply system; the sound box power supply system comprises a power management module, a charging interface connected with the power management module, a battery, a first boost converter and a second boost converter; the first boost converter is used for performing boost conversion on the power supply output by the power supply management module to generate a power supply for power amplification, and transmitting the power supply to the power amplification chip; when the voltage output by the battery through the power management module is greater than or equal to the output voltage set for the second boost converter, the second boost converter is used as a bypass branch circuit, and the voltage output by the power management module is directly transmitted to the control system; when the voltage output by the battery through the power management module is lower than the output voltage set for the second boost converter, the second boost converter boosts the voltage output by the power management module to be converted into the set output voltage, and transmits the set output voltage to the control system.
Compared with the prior art, the utility model discloses an advantage is with positive effect: the utility model discloses a set up two way boost converters in the power supply system of audio amplifier, under the monocell power supply mode, utilize one of them way boost converter to step up the battery voltage and shift to the required DC power supply of power amplifier chip to satisfy the drive demand to the loudspeaker; the other path of boost converter with the bypass characteristic is utilized, when the battery voltage is higher, the battery voltage is directly utilized to supply power for a control system in the sound box, and only when the battery voltage is lower, the battery voltage is boosted to a direct current power supply required by the control system by virtue of energy conversion of the boost converter to supply power for the control system. By adopting the circuit design, the problem of multi-level conversion of electric energy can be effectively solved, so that the energy loss is reduced, the maximum utilization of the electric energy of the battery is realized, and the standby time and the working time of the sound box product under the condition of battery power supply are ensured. Because need not through the multistage transform of electric energy from battery to control system, the heat that consequently produces is lower, and the user can not feel in the use problem such as generate heat, hair perm, has promoted user's use and has experienced then.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the invention, which is to be read in connection with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic block diagram of a circuit of a power supply system commonly used for a conventional smart speaker using a battery as a power source;
fig. 2 is a schematic circuit block diagram of an embodiment of the sound box power supply system provided by the present invention;
fig. 3 is a schematic circuit block diagram of another embodiment of the sound box power supply system of the present invention;
FIG. 4 is a schematic block diagram of the circuit of the sound box power supply system shown in FIG. 3 operating in a single battery power supply mode;
FIG. 5 is a detailed circuit schematic of one embodiment of the boost control circuit of FIG. 4;
fig. 6 is a schematic circuit block diagram of the sound box power supply system shown in fig. 3 operating in the adapter power supply mode.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
It should be noted that, in the description of the present invention, the terms "connected" and "connected" should be interpreted broadly unless explicitly stated or limited otherwise. For example, they may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 2, the present embodiment is directed to a power supply system designed for a control system, which is a main power load in an intelligent speaker, and a power amplifier chip for driving a speaker to externally output audio, and mainly includes a battery, a power management module, a charging interface, a first boost converter, a second boost converter, and other components. The charging interface is arranged on the shell of the sound box and used for being externally connected with a power adapter, and the power adapter is used for charging and storing energy for a battery in the sound box. The power management module, the first boost converter and the second boost converter are arranged in a shell of the sound box, and are preferably arranged on a main control board of the sound box. The power management module is connected with the charging interface and used for carrying out voltage reduction conversion on external power supply provided by power adaptation to generate a low-voltage power supply meeting the battery charging requirement, such as a direct-current power supply of about 4.5V, and outputting the low-voltage power supply to the battery to charge and store energy for the battery. Meanwhile, the first boost converter and the second boost converter are respectively connected to the power management module, and when the loudspeaker box works in a single battery power supply mode, the power management module respectively transmits the battery power to the first boost converter and the second boost converter. Wherein the first boost converter is used for boosting and converting the battery voltage VBAT toThe power supply voltage required by the power amplifier chip, for example, the power supply V for power amplifier which boosts the battery voltage VBAT of 4.2V and converts it into 12VBoost1And power is supplied to the power amplifier chip. The second boost converter selects a boost chip with bypass characteristics, for example a boost chip of model number SGM41280, SY7072 or SY 7069B. When the battery voltage VBAT is more than or equal to the set output voltage VBoost1When the battery voltage VBAT is larger than or equal to 4.2V, for example, the second boost converter is directly used as a bypass branch circuit, the battery voltage VBAT is transmitted to the control system, and the battery voltage VBAT is used for supplying power to the control system. When the battery voltage VBAT is less than the set output voltage VBoost1When the voltage of the battery is higher than the set output voltage, the second boost converter starts the boost function to boost the voltage of the battery to the set output voltage, for example, 4.2V, and transmits the boosted voltage to the control system to supply power for the control system, so that the stability of the supply voltage of the control system and the higher power quality are ensured, and the control system can stably and efficiently operate.
The power supply scheme shown in fig. 2 avoids multi-stage conversion of electric energy, so that the electric quantity of the battery can be utilized to the maximum extent. However, in this scheme, when the sound box is plugged into the power adapter for power supply, after the power of the power adapter needs to be reduced by the power management module, a part of the power needs to be transmitted to the battery for charging, and the other part of the power needs to be boosted by the first boost converter and converted into the direct current power needed by the power amplifier chip. The result of this power supply is: when a large dynamic music is played by a loudspeaker, the maximum transient power may not be exerted to play the music, so that the volume is low, or the sound cannot be heard by human ears in a noisy environment.
In order to solve the above problem, the present embodiment improves the power supply system shown in fig. 2, as shown in fig. 3, that is, a diode D1 and a buck converter are added on the circuit shown in fig. 2, so that the electrical load of the sound box can directly use the external power supply to operate in the power supply mode of the power adapter.
In this embodiment, the diode D1 is preferably a schottky diode, and an anode thereof is connected to the charging interface and a cathode thereof is connected to the power amplifier chip. Under the power supply mode of the power adapter, the diode D1 is conducted, external power supply provided by the power adapter is directly transmitted to the power amplifier chip, and power is supplied to the power amplifier chip so as to save the electric energy of the battery.
Under the power supply mode of the power adapter, the loudspeaker can exert the maximum power and output the maximum volume so as to meet the requirement of a user on large-volume playing.
Meanwhile, the diode D1 is additionally arranged between the charging interface and the power amplifier chip, so that the power supply V for power amplification output by the first boost converter can be preventedBoost1And the water flows back to the power management module, so that the power management module cannot work normally.
In the power supply mode of the power adapter, the first boost converter is configured to maintain a normal output state and exists as a UPS. Therefore, when the user unplugs the power adapter, the power supply of the power amplifier chip still exists, and the audio playing of the loudspeaker is not interrupted.
In order that the power amplifier chip can automatically receive power supply from the power adapter in the power supply mode of the power adapter, the present embodiment configures the output voltage of the first boost converter, i.e., the power source V for power amplificationBoost1Is less than the supply voltage output by the power adapter. For example, when the input voltage range supported by the power amplifier chip is between V1 and V2, the power supply voltage output by the power adapter may be set to V2, and the power supply V for power amplifier output by the first boost converter may be set to V2Boost1Is set to V1 ≦ VBoost1< V2. For example, assuming that the input voltage range supported by the power amplifier chip is between 10V and 12V, the power voltage output by the power adapter is preferably set to 12V, so as to meet the requirement that the speaker performs audio playing with maximum power and maximum volume. Power supply V for power amplification output by first boost converterBoost1May be set to 10.8V. Thus, in the power supply mode of the power adapter, V is usedBoost1If the voltage is less than V2, the power adapter is automatically switched to supply power for the power amplifier chip. And after the power adapter is pulled out, the first boost converter is automatically switched to supply power for the power amplifier chip.
In the power supply system of the present embodiment, the voltage will be reducedThe inverter is connected between the charging interface and the control system, as shown in fig. 3. Under the power supply mode of the power adapter, the step-down converter performs step-down conversion on external power supply provided by the power adapter to generate a low-voltage direct-current power supply V required by the control systemBuckAnd the power is supplied to the control system so as to save the electric quantity of the battery.
As a preferred embodiment, the output voltage V of the second boost converter is preferably configured for the condition that the input voltage range supported by the control system is between V3-V4Boost2The conditions are satisfied: v is not less than V3Boost2< V4, and the output voltage V of the buck converterBuckThe conditions are satisfied: vBoost2＜VBuckV4 is less than or equal to. Therefore, when the sound box is externally connected with the power adapter, the power adapter can be automatically switched to supply power to the control system, and the control system does not need to be switched in an auxiliary mode, so that the software design is simplified.
For example, assuming that the input voltage range supported by the control system is between 4V and 4.5V, the output voltage V of the second boost converter is preferably setBoost2Set to 4.2V, the output voltage V of the buck converterBuckIs set between 4.3V and 4.5V, such as VBuck= 4.4V. Thus, in the power supply mode of the power adapter, V is usedBoost2＜VBuckAnd then automatically switching to a power adapter to supply power to the control system through the buck converter. And after the power adapter is unplugged, the second boost converter is automatically switched to supply power for the control system.
In the power supply mode of the power adapter, the power supply path between the power amplifier chip and the control system is shown in fig. 6.
Under the single cell power supply module, the power supply path between the power amplifier chip and the control system is as shown in fig. 4, that is, the power management module transmits the battery voltage VBAT to the first boost converter and the second boost converter respectively, and supplies power to the power amplifier chip through the first boost converter and supplies power to the control system through the second boost converter.
In order to achieve maximum use of the battery power, the power output of the first boost converter is preferably cut off when the audio enters the standby mode to reduce power consumption.
To achieve the above object, the present embodiment preferably configures the control system to output the enable signal when the speaker enters the standby mode, and control the first boost converter to stop outputting the power V for power amplificationBoost1And the power amplifier chip and the loudspeaker are powered off and stop running so as to avoid energy consumption.
As a preferred embodiment, in the case where a switching tube (for selectively outputting the power supply converted and generated by the first boost converter) is disposed in the first boost converter, a boost control circuit may be additionally disposed between the first boost converter and the control system, and as shown in fig. 4, the control system outputs an enable signal to control the operation of the boost control circuit, thereby controlling the on/off of the switching tube in the first boost converter.
In some embodiments, as shown in fig. 5, when the switching transistor disposed in the first boost converter is the PMOS transistor Q1, the source of the PMOS transistor Q1 receives the power V for power amplification generated by the conversion of the first boost converter through the current limiting resistor R3Boost1The drain is connected with a power supply terminal PA _12V of the power amplifier chip, a first voltage dividing resistor R1 is connected between the source and the grid of the PMOS tube Q1 in a crossing mode, and meanwhile the grid of the PMOS tube Q1 is connected with the boost control circuit through a second voltage dividing resistor R2. An NPN type triode Q2 is arranged in the BOOST control circuit, the collector of the NPN type triode Q2 is connected to the second voltage-dividing resistor R2, the emitter is grounded, the base is connected with the control system, and the enable signal BOOST _ POWER output by the control system is received. In order to adjust the level of the enable signal BOOST _ POWER to meet the requirement of the on-state voltage of the NPN-type transistor Q2, the voltage dividing resistors R4 and R5 are designed in this embodiment to perform voltage dividing conversion on the level of the enable signal BOOST _ POWER, and then transmit the converted level to the gate of the NPN-type transistor Q2, so as to control the NPN-type transistor Q2 to be in saturation conduction or cut-off.
The operating principle of the control circuit shown in fig. 5 is: when the sound box is in a normal working mode or a POWER adapter charging mode, the control system outputs a high-level effective enable signal BOOST _ POWER, and controls the NPN type triode Q2 to be in saturated conduction after voltage division is carried out by the voltage division resistors R4 and R5. At this time, the source voltage of the PMOS tube Q1 is the power supply V for power amplificationBoost1Voltage ofGrid voltage is power supply V for power amplificationBoost1The voltage divided by the first divider resistor R1 and the second divider resistor R2 configures the resistance values of the first divider resistor R1 and the second divider resistor R2, so that the gate-source voltage of the PMOS tube Q1 is larger than the conduction voltage drop thereof, the PMOS tube Q1 enters a saturated conduction state, and a power supply V for power amplification is usedBoost1The power is transmitted to the power amplifier chip through the source electrode and the drain electrode of the PMOS pipe Q1.
When the sound box enters the standby mode, the control system sets the enable signal BOOST _ POWER to be low level and controls the NPN type triode Q2 to be cut off. At this time, the source voltage of the PMOS transistor Q1 is equal to the drain voltage thereof, and the PMOS transistor Q1 enters a cut-off state, thereby cutting off the power supply V for power amplificationBoost1The power amplifier chip and the loudspeaker are powered off by the output of the power amplifier, energy consumption is not generated any more, and the electric quantity of the battery is saved.
The sound box power supply scheme fully considers the requirements of users on the power supply duration and the maximum volume of products, adopts different control strategies under different power supply modes by reducing energy loss, and then meets the use requirements of users on sound boxes.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (10)
1. A sound box power supply system comprises a power management module, a charging interface and a battery, wherein the charging interface is connected with the power management module; it is characterized by also comprising:
the first boost converter is connected with the power management module and used for carrying out boost conversion on the power output by the power management module to generate a power for power amplification and transmitting the power to a power amplification chip for driving a loudspeaker in a sound box;
the second boost converter is connected with the power management module, and when the voltage output by the battery through the power management module is greater than or equal to the output voltage set for the second boost converter, the second boost converter is used as a bypass branch circuit and directly transmits the voltage output by the power management module to a control system in the sound box; when the voltage output by the battery through the power management module is lower than the output voltage set for the second boost converter, the second boost converter boosts the voltage output by the power management module to be converted into the set output voltage, and transmits the set output voltage to the control system in the sound box.
2. The speaker power supply system of claim 1, further comprising:
the anode of the diode is connected with the charging interface, and the cathode of the diode is connected with the power amplifier chip; when the charging interface is externally connected with the power adapter, the diode is conducted, and power output by the power adapter is transmitted to the power amplifier chip to supply power to the power amplifier chip.
3. The sound box power supply system according to claim 2, wherein the voltage of the power supply for power amplification output by the first boost converter is smaller than the power supply voltage output by the power adapter.
4. The speaker power supply system of claim 3,
the input voltage range supported by the power amplifier chip is between V1 and V2;
the power adapter outputs a supply voltage of V2,
the voltage of the power supply for power amplification output by the first boost converter is VBoost1And V is not less than V1Boost1＜V2。
5. The audio amplifier power supply system of claim 3, wherein the control system outputs an enable signal to control the first boost converter to stop outputting the power for power amplification when the audio amplifier enters the standby mode.
6. The sound box power supply system according to claim 5, wherein a switch tube is provided in the first boost converter for selectively outputting the power source for power amplification generated by the conversion of the first boost converter, and the enable signal output by the control system is used for controlling the on/off of the switch tube.
7. The sound box power supply system according to claim 6, wherein the switching transistor is a PMOS transistor, and the source of the switching transistor is connected to the power supply for power amplification generated by the conversion of the first boost converter and connected to the gate of the first boost converter through a first voltage dividing resistor; the drain electrode of the PMOS tube is connected with the power amplifier chip, the grid electrode of the PMOS tube is connected with the collector electrode of an NPN type triode through a second divider resistor, the emitting electrode of the NPN type triode is grounded, and the base electrode of the NPN type triode is connected with the control system and receives the enabling signal.
8. A sound box power supply system according to any one of claims 1 to 7, further comprising:
and the buck converter is connected with the charging interface, and when the charging interface is externally connected with a power adapter, the power output by the power adapter is subjected to buck conversion and then transmitted to a control system in the sound box to supply power for the control system.
9. The speaker power supply system of claim 8,
the input voltage range supported by the control system is between V3 and V4;
the output voltage of the second boost converter is VBoost2And V is not less than V3Boost2＜V4；
The output voltage of the buck converter is VBuckAnd V isBoost2＜VBuck≤V4。
10. A sound box comprises a control system, a loudspeaker and a power amplifier chip for driving the loudspeaker; the sound box power supply system is characterized by further comprising the sound box power supply system according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022819029.6U CN213637159U (en) | 2020-11-30 | 2020-11-30 | Sound box power supply system and sound box |
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| CN202022819029.6U CN213637159U (en) | 2020-11-30 | 2020-11-30 | Sound box power supply system and sound box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116634541A (en) * | 2023-07-19 | 2023-08-22 | 荣耀终端有限公司 | Power supply circuit, power supply method and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116634541A (en) * | 2023-07-19 | 2023-08-22 | 荣耀终端有限公司 | Power supply circuit, power supply method and electronic equipment |
| CN116634541B (en) * | 2023-07-19 | 2023-11-07 | 荣耀终端有限公司 | Power supply circuit, power supply method and electronic equipment |
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