Patent ID: 12191822

DETAILED DESCRIPTION OF THE EMBODIMENTS

Description will be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description hereinafter refers to the accompanying drawings, the same reference numerals in different drawings represent the same or similar elements, unless otherwise represented. The implementation manners described in the following exemplary examples do not represent all implementation manners consistent with the present invention. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present invention as detailed in the appended claims.

The problem that an existing USB loudspeaker box is limited by power, resulting in limiting volume and sound quality, and the problem that a loudspeaker box provided with an adapter and powered by a mains supply, resulting in high manufacturing cost of the loudspeaker box are solved. A series of studies have been made on the loudspeaker box. The audio signal is converted into an analogue audio signal after entering the loudspeaker box. The analogue audio signal is a dynamically changed current signal. The size of the current changes according to the factors such as the frequency and the intensity of the audio sound. Furthermore, the change is very great. For example, due to the difference of frequency and intensity between the gentle prelude and intense chorus in a song, the current, intensity of the audio signal can reach 10000 times as strong or weak as, possible. It is found in an experiment that the average consumed power of a USB loudspeaker box with a power supply power of 6 W is only about 3 W when music is played. Based on the above findings, this embodiment proposes to take power supply as a starting point for the first time so as to effectively solve the problem that the power is limited. Specifically, referring toFIG.1, the hybrid power supply-based high-power loudspeaker box provided by this embodiment mainly includes an audio input unit1, a power amplification unit2, a loudspeaker3and a power supply management module4, where the audio input unit1is used to receive an input audio signal; an input terminal of the power amplification unit2is connected to an output terminal of the audio input unit1and is used to receive an audio signal output by the audio input unit1and amplify the audio signal; an input terminal of the loudspeaker3is connected to an output terminal of the power amplification unit2; the power amplification unit2inputs the amplified audio signal into the loudspeaker3and drives the loudspeaker to make a sound; the power supply management module4mainly includes a power supply power-supplying unit41, a battery power-supplying unit42and an FET control unit43; an input terminal of the power supply power-supplying unit41power supply; the battery power-supplying unit42is connected in series to the FET control unit43and then is connected to an output terminal of the power supply power-supplying unit41; according to the power amplification power required by the power amplification unit2and the change of the system voltage corresponding to the power amplification unit2, the power supply management module4automatically switches a conducting state of the FET control unit43, adjusts the working sates of the battery power-supplying unit42and the power supply power-supplying unit41, and dynamically supplies power for the power amplification unit2.

The working state of the FET control unit43includes: forward conduction, reverse conduction and off. According to the power amplification power required by the power amplification unit2and the change of the system voltage corresponding to the power amplification unit2, the power supply management module4automatically switches a conducting state of the FET control unit43, adjusts the working states of the battery power-supplying unit42and the power supply power-supplying unit41, and dynamically supplies power for the power amplification unit2, which is specifically as follows:when the power amplification power required by the power amplification unit2is less than the power supply power, and the voltage difference between the system voltage corresponding to the power amplification unit2and the voltage of the battery power-supplying unit42is greater than or equal to the conducting threshold of the FET control unit43, the FET control unit43is forwardly conducted, and the power supply power-supplying unit41charges the battery power-supplying unit42while supplying power for the power amplification unit2;when the power amplification power required by the power amplification unit2is less than the power supply power, and the voltage difference between the system voltage corresponding to the power amplification unit2and the voltage of the battery power supply unit42is less than the conducting threshold of the FET control unit43, the FET control unit43is not conducted, and the power supply power-supplying unit41only supplies power for the power amplification unit2; andwhen the power amplification power required by the power amplification unit2is greater than or equal to the power supply power, and the voltage difference between the voltage of the battery power-supplying unit42and the system voltage corresponding to the power amplification unit2is greater than or equal to the conducting threshold of the FET control unit43, the FET control unit43is reversely conducted, and the power supply power-supplying unit41and the battery power-supplying unit42supply power for the power amplification unit2.

The conducting state of the FET control unit43is essentially automatically controlled by the difference between the voltages accessed to two terminals of the FET control unit43. Through the above experiment, it is found that for the input audio signal of a piece of music, the currents of the corresponding audio signals are different due to the frequency and intensity of the audio sound, and the magnification times of the power amplification unit in the loudspeaker box are fixed. When the current of the input audio signal is low, the power amplification power consumed by the power amplification unit is low. As the resistance of the bias resistor is always unchanged, the voltage divided by the bias resistor is less, and the system voltage V_SYS corresponding to the power amplification unit will be high. At this time, the voltage at a position where the FET control unit is connected to the output terminal of the power supply power-supplying unit. When the battery power-supplying unit is a state of power shortage, the voltage at a position where the FET control unit is connected to the battery power-supplying unit is low. The FET control unit is forwardly conducted under the action of voltage difference between the two terminals. The power supply power-supplying unit communicate with both the power amplification unit and the battery power-supplying unit, and charges the battery power-supplying unit while supplying power for the power amplification unit. When the battery power-supplying unit is a fully charged state, the voltage at position where FET control unit is connected to the battery power-supplying unit is high, the voltage difference between the two terminals of the FET control unit is low, the FET control unit is not conducted, and the power supply power-supplying unit only communicates with the power amplification unit and only supplies power for the power amplification unit. When the current of the input audio signal is high, the power amplification power consumed by the power amplification unit is high. As the resistance of the bias resistor is always unchanged, so the voltage divided by the bias resistor is more, and the system voltage V_SYS corresponding to the power amplification unit will be low. At this time, the voltage at a position where the FET control unit is connected to the output terminal of the power supply power-supplying, unit is low, and the voltage at a position where the FET control unit is connected to the battery power-supplying unit is high. The FET control unit is reversely conducted under the action of the voltage difference between the two terminals, and the power supply power-supplying unit and the battery power-supply unit are communicated with the power amplification unit and supply power for the power amplification unit. At this time, the power amplification unit can play with high power greater than the power supply power due to the electric quantity input by the battery power-supplying unit. The power supply power in the present application refers to the power of the power supply power-supplying unit.

The loudspeaker box takes the power supply power-supplying unit as main power supply, and takes the battery power-supplying unit as auxiliary power supply. When the playing power is low, the power supply power-supplying unit supplies power for the battery power-supplying unit, and the battery power-supplying unit is in a state of shallow charging and shallow discharging in the whole power supply process. Therefore, the power supply power-supplying unit has long service life and will not affect the useful life of the loudspeaker box. Furthermore, due to low output power of the battery power-supplying unit, the requirement on the performance of the battery power-supplying unit is low, a common small-capacity battery is only required, and the cost is low. The battery power-supplying unit may select various rechargeable batteries such as a storage battery and a lithium battery.

If the power amplification unit is singly powered and played by the battery power-supplying unit, the loss of the battery power-supplying unit is large and single power supply of the battery power-supplying unit generally cannot meet sufficient power supply, so that the sound of the loudspeaker box is distorted and the playing sound quality is affected. In order to avoid the above situation, as improvement of the technical solution, referring toFIG.1, a power supply power-supplying detection unit5is arranged in the USB loudspeaker box, where an input terminal of the power supply power-supplying detection unit5is connected to an input port of the power supply power-supplying unit41and is used to detect whether a power supply current input to the power supply power-supplying unit41is present; an output terminal of the power supply power-supplying detection unit5is connected to a control terminal of the power amplification unit2; and the power supply power-supplying detection unit5controls whether the power amplification unit2is allowed to be started according to the detected external power supply current state input by the power supply power-supplying unit. Specifically, when an external power supply current is detected, the power amplification unit2is allowed to be started. At this time, after the loudspeaker box is turned on, the loudspeaker box normally starts. When the external power supply current is not detected, the power amplification unit2is not allowed to be started. At this time, even if the loudspeaker box is turned on, the loudspeaker box still cannot work normally.

The high-power loudspeaker may be applied to a USB loudspeaker box, or may be applied to a loudspeaker provided with an adapter and powered by a mains supply.

When the high-power loudspeaker box is applied to the USB loudspeaker box, the problem that the USB loudspeaker box is limited by power can be effectively solved. In general, the voltage powered by the USB interface is 5V, and the power supply power of the corresponding loudspeaker box is 6 W. By adoption of the technical solution, the loudspeaker box is provided with the power supply power-supplying unit and is further provided with a single 18650 lithium battery serving as the battery power-supplying unit. At this time, the power supply power-supplying unit and the battery power-supplying unit supply power for the power amplification unit. The loudspeaker box can output the power of about 12 W, and is not limited by the power supply power of 6 W. In actual use, batteries with different voltages may be configured according to actual requirements to serve as the battery power-supplying unit to meet the output of the corresponding power.

When the high-power loudspeaker box is applied to the loudspeaker powered by the mains supply and with the adapter, the cost of the loudspeaker box can be reduced. Similarly, taking the loudspeaker box with the power supply power of 36 W in the background art as an example, by the previous art, the 36 W loudspeaker box needs to be configured with a 36 W adapter with the price about 36 yuan. However, by adoption of the above solution, the 36 W loudspeaker box may be configured with a 18 W adapter, and a group of 18 W battery is internally provided to serve as the battery power-supplying unit. At this time, when the power supply power-supplying unit and the battery power-supplying unit supply power for the power amplification unit, the maximum output power still can reach 36 W, and the corresponding cost is about 24 yuan. The 18 W adapter is 18 yuan, and the 18 W battery pack is 6 yuan, so the manufacturing cost is reduced on the basis of ensuring the original power output.

This embodiment further provides a hybrid power supply-based power supplying method for increasing the power of a loudspeaker. The loudspeaker is provided with a battery power-supplying unit, and a power supply power-supplying unit powered by an external power supply. Referring toFIG.2, the power supplying method includes the following steps:S1: an audio signal input by the loudspeaker box is acquired, and a current value corresponding to the audio signal is detected;S2: according to the current value corresponding to the audio signal and a power amplification factor of the loudspeaker box, a power amplification power required by the loudspeaker box is calculated;S3: a system voltage corresponding to a power amplification unit in the loudspeaker and a voltage of a battery power-supplying unit in the loudspeaker box are detected in real time; andS4: according to the power amplification power required by the loudspeaker box, the system voltage corresponding to the power amplification unit in the loudspeaker box, and the voltage of the battery power-supplying unit in the loudspeaker box, the working states of the battery power-supplying unit and the power supply power-supplying unit are controlled to dynamically supply power for the power amplification unit in the loudspeaker.

In the step S4, according to the power amplification power required by the loudspeaker box, the system voltage corresponding to the power amplification unit in the loudspeaker box, and the voltage of the battery power-supplying unit in the loudspeaker box, the working states of the battery power-supplying unit and the power supply power-supplying unit are controlled to dynamically supply power for the power amplification unit in the loudspeaker, which is specifically as follows:the power amplification power required by the loudspeaker box is compared with rated power amplification power of the loudspeaker box to obtain a power comparison result;the system voltage corresponding to the power amplification unit in the loudspeaker box is compared with the voltage of the battery power-supplying unit in the loudspeaker box to obtain a voltage comparison result; andaccording to the power comparison result and the voltage comparison result, the working states of the battery power-supplying unit and the power supply power-supplying, unit are controlled to dynamically supply power for the power amplification unit in the loudspeaker box,where when the power amplification power required by the loudspeaker box is less than the rated power amplification power of the loudspeaker box, and a voltage difference between the system voltage corresponding to the power amplification unit in the loudspeaker box and the voltage of the battery power-supplying unit is greater than or equal to a threshold, the power supply power-supplying unit is controlled to charge the battery power-supplying unit while supplying power for the power amplification unit in the loudspeaker box;when the power amplification power required by the loudspeaker box is less than the rated power amplification power of the loudspeaker box, and a voltage difference between a system voltage corresponding to the power amplification unit in the loudspeaker box and a voltage of the battery power-supplying unit is less than a threshold, the power supply power-supplying unit is controlled to only supply power for the power amplification unit in the loudspeaker box: andwhen the power amplification power required by the loudspeaker box is greater than or equal to the rated power amplification power of the loudspeaker box, and the voltage difference between the system voltage corresponding to the power amplification unit, in the loudspeaker box and the voltage of the battery power-supplying unit is greater than or equal to the threshold, the power supply power-supplying unit and the battery power-supplying unit are controlled to supply power for the power amplification unit in the loudspeaker box.

In order to prevent the battery power-supplying unit from singly supplying power for the power supply power-supplying unit in the loudspeaker box for work, as an improvement of the technical solution, the power supplying method further includes the following steps:an input power supply current of the power supply power-supplying unit in the loudspeaker box is detected, and when the input power supply current is greater than a current threshold, the power amplification unit in the loudspeaker unit is allowed to be started, otherwise, the power amplification unit in the loudspeaker box is not allowed to be started.

Similarly, the power supplying method is suitable for the loudspeaker box which is a USB loudspeaker box or a loudspeaker box provided with an adapter and powered by a mains supply.

After considering the specification and practising the disclosure disclosed herein, those skilled in the art would readily conceive of other embodiments of the present disclosure. This application is intended to cover any variations, uses or adaptive changes of the present disclosure. These variations, uses or adaptive changes follow the general principle of the present disclosure and include common general knowledge or conventional technical means in the technical field that are not disclosed in the present disclosure. The specification and the embodiments are merely regarded as exemplary, and the real scope and spirit of the present disclosure are indicated by the following claims.

It should be understood that the present disclosure is not limited to the precise structure described above and shown in the drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.