Audio and boost adaptive circuit, boost chip and audio power amplifier

Abstract

An audio and boost adaptive circuit, a boost chip and an audio amplifier. A power supply detection circuit detects a power supply signal provided by a power supply and generates a power supply level signal according to a voltage detection result; a reference voltage generation circuit generates a peak voltage reference signal according to the power supply level signal; an audio detection circuit detects the amplitude of a target audio signal to generate an audio detection signal, and compares the audio detection signal with the peak voltage reference signal, and generates an audio level signal according to the comparison result; an output voltage control circuit obtains a voltage gear signal according to the power supply level signal and the audio level signal; a voltage regulation circuit generates a driving voltage signal according to the voltage gear signal to supply power to an audio processing circuit; the circuit realizes automatic identification of the number of power supply lithium batteries, and detects an audio signal to realize dynamic matching of an output power supply voltage boost value with an audio load, thereby ensuring the sound quality of the output audio, reducing costs, saving the area of ​​a PCB board and improving overall efficiency.

Description

Technical Field

[0001] The present application belongs to the technical field of audio power amplifiers, and in particular, relates to an audio and boost adaptive circuit, a boost chip, and an audio power amplifier. Background Art

[0002] At present, with the widespread application of portable audio, a variety of power supply methods have been derived, among which lithium battery power supply is the most common. In actual application, people often use different numbers of batteries and different application circuits according to different power requirements, that is, choose different chips to drive. This method will result in the need to replace the power supply solution and PCB board when customers need to use different power supply methods to make different products. This will lead to high product solution costs, waste of PCB boards, and even the loss of end customers due to uneven production capacity distribution and failure to produce the products required by customers in a timely and effective manner. Moreover, traditional portable audio devices are either unable to automatically identify the number of power supply batteries, or can automatically identify one or two lithium batteries to control the boost value. However, when there are three batteries for power supply, external control pins and changes in the control program are required to realize the identification and application of the three batteries, which is not convenient to use; and high-power dynamic boost chips and high-power audio chips can only be used independently, resulting in a large PCB board area and low overall efficiency; at the same time, in the process of battery power decreasing, since the speaker needs to draw a large current to meet the power requirement, it will cause the battery voltage to be lower when the output power is large, resulting in changes in sound quality, or the main control is directly pulled to death and shut down, wasting the remaining battery power and shortening the battery life. In the application process, you can only choose to increase the battery capacity or increase the battery's instantaneous discharge capability to solve the above problems, which will lead to increased costs.

[0003] Traditional audio equipment technical solutions have problems such as being unable to automatically match the driving voltage and audio amplifier power according to different power supply methods to ensure sound quality, low overall efficiency, and high cost. Summary of the invention

[0004] The purpose of this application is to provide an audio and boost adaptive circuit, a boost chip and an audio amplifier, aiming to solve the problems that traditional audio equipment technical solutions cannot automatically match the driving voltage and audio amplifier power according to different power supply methods to ensure sound quality, have low overall efficiency, and high cost.

[0005] A first aspect of an embodiment of the present application provides an audio and boost adaptive circuit, connected to a power supply and an audio processing circuit, the audio and boost adaptive circuit comprising:

[0006] An audio and boost adaptive circuit is connected to a power supply and an audio processing circuit, and the audio and boost adaptive circuit comprises:

[0007] a power detection circuit configured to detect a power supply signal provided by the power supply to generate a voltage detection signal, compare the voltage detection signal with a preset voltage reference signal, and compare the duration of the voltage detection signal with a first reference duration, and generate a power level signal according to the comparison result;

[0008] a reference voltage generating circuit, connected to the power detection circuit, and configured to generate a peak voltage reference signal according to the power level signal;

[0009] an audio detection circuit, connected to the audio processing circuit, configured to detect the amplitude of the target audio signal to generate an audio detection signal, and compare the audio detection signal with the peak voltage reference signal, and generate an audio level signal according to the comparison result;

[0010] an output voltage control circuit, connected to the power detection circuit and the audio detection circuit, and configured to obtain a voltage gear signal according to the power level signal and the audio level signal;

[0011] The voltage regulating circuit is connected to the output voltage control circuit and the audio processing circuit, and is configured to generate a driving voltage signal according to the voltage gear signal to supply power to the audio processing circuit.

[0012] In one embodiment, the audio and boost adaptive circuit further includes:

[0013] The output power adjustment circuit is connected to the voltage adjustment circuit and is configured to adjust the power of the driving voltage signal according to the control signal.

[0014] In one embodiment, the output power adjustment circuit includes:

[0015] A third logic processing unit, configured to generate a power adjustment signal according to the input control signal;

[0016] The power regulating unit is connected to the third logic processing unit and the voltage regulating circuit, and is configured to regulate the power of the driving voltage signal according to the power regulating signal.

[0017] In one embodiment, the power detection circuit includes:

[0018] a voltage sampling unit, connected to the power supply and configured to detect a power supply signal provided by the power supply to generate a voltage detection signal;

[0019] a comparison unit connected to the voltage sampling unit, configured to compare the voltage detection signal with the preset voltage reference signal, and to compare the duration of the voltage detection signal with the first reference duration, and to generate a target voltage comparison signal according to the comparison result;

[0020] The first logic processing unit is connected to the comparison unit, the reference voltage generation circuit and the output voltage control circuit, and is configured to generate the power level signal according to the target voltage comparison signal.

[0021] In one embodiment, the audio detection circuit includes:

[0022] A plurality of audio amplitude detection units, each of which is connected to the reference voltage generating circuit and the audio processing circuit, and each of which is configured to detect the amplitude of the target audio signal to generate an audio detection signal, and compare the audio detection signal with the peak voltage reference signal, and generate an audio gear signal according to the comparison result;

[0023] The second logic processing unit is connected to the audio amplitude detection unit and the output voltage control circuit, and is configured to generate the audio level signal according to the audio gear signal.

[0024] In one embodiment, the output voltage control circuit includes:

[0025] A voltage dividing unit connected to the voltage regulating circuit and configured to perform feedback voltage division on the driving voltage signal output by the voltage regulating circuit to generate a plurality of sets of voltage gear signals;

[0026] A first gating control unit, connected to the power detection circuit and the voltage dividing unit, configured to select and output a corresponding group of voltage gear signals from a plurality of groups of voltage gear signals according to the power level signal; wherein each group of the voltage gear signals includes voltage gear signals of a plurality of voltage levels;

[0027] A second gating control unit is connected to the first gating control unit and the voltage regulating circuit, and is configured to select and output one voltage gear signal from a group of voltage gear signals selected and output by the first gating control unit according to the audio level signal.

[0028] In one embodiment, the audio processing circuit includes:

[0029] an audio control unit, connected to the audio detection circuit, configured to perform operational amplification processing on the audio input signal to generate the target audio signal, and generate an audio gain signal according to the target audio signal;

[0030] The audio driving unit is connected to the audio control unit and the audio playing component, and is configured to generate an audio output signal according to the audio gain signal and the driving voltage signal to the audio playing component for playing.

[0031] In one embodiment, the voltage sampling unit includes: a first resistor, a second resistor and a third resistor; wherein the first end of the first resistor is connected to the power supply signal end, the second end of the first resistor and the first end of the second resistor are commonly connected to the comparison unit, the second end of the second resistor and the first end of the third resistor are commonly connected to the comparison unit, and the second end of the third resistor is connected to the power ground.

[0032] A second aspect of an embodiment of the present application provides a boost chip, the boost chip comprising any of the above-mentioned audio and boost adaptive circuits.

[0033] A third aspect of an embodiment of the present application provides an audio power amplifier, which includes the audio and boost adaptive circuit as described in any one of the above items or the boost chip as described in the above items.

[0034] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: the above-mentioned audio and boost adaptive circuit, boost chip and audio amplifier detect the power supply signal provided by the power supply through the power supply detection circuit to generate a voltage detection signal, and compare the voltage detection signal with a preset voltage reference signal, and compare the duration of the voltage detection signal with a first reference duration, and generate a power level signal according to the comparison result; the reference voltage generation circuit generates a peak voltage reference signal according to the power level signal; the audio detection circuit detects the amplitude of the target audio signal to generate an audio detection signal, and compares the audio detection signal with the peak voltage reference signal, and generates an audio level signal according to the comparison result; the output voltage control ... The power level signal and the audio level signal are used to obtain a voltage gear signal; the voltage regulating circuit generates a driving voltage signal according to the voltage gear signal to supply power to the audio processing circuit; the automatic and reliable detection and identification of the number of multiple lithium batteries in the connected power supply is realized, and the dynamic matching of the battery power supply voltage boost value and the audio load is realized by detecting the level of the audio signal, so as to ensure the sound quality of the output audio, and enable the customer to realize plug-and-play of the battery power supply when selecting different power supply modes, without the need to redesign the boost scheme and change the printed circuit board (PCB board), thus reducing the cost, and integrating the dynamic boost circuit and the audio circuit together, thus greatly saving the area of ​​the PCB board in the application, improving the overall efficiency, and making the application more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A structural schematic diagram of an audio and boost adaptive circuit provided in an embodiment of the present application;

[0036] Figure 2 Another structural schematic diagram of an audio and boost adaptive circuit provided in an embodiment of the present application;

[0037] Figure 3 Another structural schematic diagram of an audio and boost adaptive circuit provided in an embodiment of the present application;

[0038] Figure 4 An exemplary circuit schematic diagram of a power supply detection circuit in an audio and boost adaptive circuit provided in an embodiment of the present application;

[0039] Figure 5 An exemplary circuit schematic diagram of an audio detection circuit in an audio and boost adaptive circuit provided in an embodiment of the present application;

[0040] Figure 6 An exemplary circuit schematic diagram of an output voltage control circuit in an audio and boost adaptive circuit provided in an embodiment of the present application;

[0041] Figure 7 To reduce the current limit value is the timing diagram of the control signal;

[0042] Figure 8 Here is the timing diagram of the control signals for increasing the current limit value. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0045] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] Figure 1 The structure diagram of the audio and boost adaptive circuit provided by the first embodiment of the present application is shown. For the convenience of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0048] An audio and boost adaptive circuit 10 is connected to a power supply and an audio processing circuit 20. The audio and boost adaptive circuit 10 includes: a power detection circuit 11, a reference voltage generation circuit 12, an audio detection circuit 13, an output voltage control circuit 14 and a voltage regulation circuit 15.

[0049] The power detection circuit 11 is configured to detect the power supply signal provided by the power supply to generate a voltage detection signal, and compare the voltage detection signal with a preset voltage reference signal, and compare the duration of the voltage detection signal with a first reference duration, and generate a power level signal according to the comparison result; the reference voltage generation circuit 12 is connected to the power detection circuit 11, and is configured to generate a peak voltage reference signal according to the power level signal; the audio detection circuit 13 is connected to the audio processing circuit 20, and is configured to detect the amplitude of the target audio signal to generate an audio detection signal, and compare the audio detection signal with the peak voltage reference signal, and generate an audio level signal according to the comparison result; the output voltage control circuit 14 is connected to the power detection circuit 11 and the audio detection circuit 13, and is configured to obtain a voltage gear signal according to the power level signal and the audio level signal; the voltage regulation circuit 15 is connected to the output voltage control circuit 14 and the audio processing circuit 20, and is configured to generate a driving voltage signal according to the voltage gear signal to power the audio processing circuit 20.

[0050] In a specific implementation, the audio and boost adaptive circuit 10 and the audio processing circuit 20 are integrated on a printed circuit board (PCB board) to form an integrated chip. Optionally, the power supply is a battery power supply, and the battery power supply includes at least one energy storage battery, such as a lithium battery. The power detection circuit 11 detects the power supply signal (VBAT) output by the power supply to generate a voltage detection signal, and compares the voltage detection signal with a preset voltage reference signal and the duration of the voltage detection signal with a first reference duration, and generates a power level signal according to the comparison result, so as to automatically identify the number of lithium batteries contained in the battery power supply and determine the power level of the power supply. The reference voltage generation circuit 12 generates a peak voltage reference signal according to the power level signal as a reference signal for dividing the audio power level; wherein the peak voltage reference signal is a plurality of groups. The audio processing circuit 20 generates a target audio signal after performing operations such as amplification on the input audio signal (INP, INN), and the audio detection circuit 13 detects the target audio signal to generate an audio detection signal, and compares the audio detection signal with a plurality of groups of peak voltage reference signals, and generates an audio level signal according to the comparison result. The output voltage control circuit 14 determines the power level of the power supply according to the power identification signal, that is, determines whether the battery power supply is powered by several lithium batteries, and then determines the gear of the required driving voltage according to the audio level signal, thereby obtaining a voltage gear signal. The voltage regulation circuit 15 determines whether a boost process is required according to the voltage gear signal, and performs a boost process on the voltage gear signal when a boost process is required, so as to generate and output a driving voltage signal to the audio processing circuit 20, so as to provide a matching working voltage for the audio signal output by the audio processing circuit 20 for playback, thereby ensuring the audio playback quality.

[0051] The embodiment of the present application can automatically and reliably identify the number (number of cells) of lithium batteries in the connected power supply, and dynamically match the battery power supply voltage boost value with the audio load by detecting the level of the audio signal, thereby ensuring the sound quality of the output audio, and enabling customers to achieve plug-and-play of battery power when choosing different power supply methods, without the need to redesign the power supply plan and change the printed circuit board (PCB board), thereby reducing costs, and integrating the dynamic boost circuit and the audio processing circuit together, effectively saving the area of ​​the PCB board in the application, improving the overall efficiency, and making the application more convenient.

[0052] See also Figure 2 In one embodiment, the audio and boost adaptive circuit 10 further includes: an output power adjustment circuit 16 .

[0053] The output power adjustment circuit 16 is connected to the voltage adjustment circuit 15 and is configured to adjust the power of the driving voltage signal according to the control signal.

[0054] In a specific implementation, when the external main control circuit detects that the voltage output by the battery power supply is too low, for example, when the main control circuit detects that the voltage value output by the battery power supply is less than the first preset voltage threshold, a control signal is generated and transmitted to the output power adjustment circuit 16 through the control terminal CTRL of the audio and boost adaptive circuit 10. Optionally, the control signal is a pulse signal. The output power adjustment circuit 16 adjusts the current limit value according to the control signal to limit the output power of the driving voltage adaptive circuit 10, that is, to adjust the power of the driving voltage signal output by the voltage adjustment circuit 15, so as to achieve the purpose of changing the current required by the audio load (including the speaker), ensuring the continuous and stable operation of the main control circuit, and making the audio quality unchanged, avoiding the situation that when the battery voltage is too low, the audio load needs to draw a large current to meet the power demand, resulting in a change in sound quality or the main control circuit is pulled to shut down, avoiding energy waste, improving the battery life, and improving the application efficiency of the battery power supply.

[0055] Optionally, the main control circuit can also detect the voltage output by the battery power supply based on a voltage detection signal generated by the power detection circuit 11 for detecting the power supply signal provided by the battery power supply, and when the voltage detection signal is used to determine that the voltage output by the battery power supply is too low, for example, when the main control circuit detects that the voltage value corresponding to the voltage detection signal is less than a first preset voltage threshold, a control signal in the form of a pulse is generated to limit the output power of the driving voltage adaptive circuit 10.

[0056] See also Figure 3 In one embodiment, the output power adjustment circuit 16 includes: a third logic processing unit 161 and a power adjustment unit 162. The third logic processing unit 161 is configured to generate a power adjustment signal according to an input control signal; the power adjustment unit 162 is connected to the third logic processing unit 161 and the voltage adjustment circuit 15, and is configured to adjust the power of the driving voltage signal according to the power adjustment signal.

[0057] In a specific implementation, the power regulating unit 162 includes a power switch tube, which adjusts the duty cycle of the power switch tube through a power regulating signal, thereby adjusting the current limiting value, and further adjusting the power of the driving voltage signal output to the audio processing circuit 20, thereby realizing adaptive current limiting when the battery power supply is low. The switching duty cycle of the power switch tube can also be controlled according to actual needs to adjust the current limiting value, thereby limiting the power of the output driving voltage signal, ensuring the sound quality of the output audio, avoiding waste of battery energy, and improving the battery power endurance.

[0058] In one embodiment, see Figure 3, the power adjustment unit 162 includes a first field-effect transistor Q1; wherein, the gate of the first field-effect transistor Q1 is connected to the output terminal of the voltage adjustment circuit 15 and the third logic processing unit 161, the source of the first field-effect transistor Q1 is connected to the power ground, and the drain of the first field-effect transistor Q1 supplies power to the boost output terminal of the audio and boost adaptive circuit 10 and the audio load supply terminal. The switching duty cycle of the first field-effect transistor Q1 is adjusted through the power adjustment signal, thereby adjusting the current limiting value, and further limiting the power of the drive voltage signal output to the audio processing circuit 20, so as to adaptively limit the current when the battery power supply is low to limit the output power of the audio and boost adaptive circuit 10, achieving the purpose of protecting the battery; and after the battery is charged to the safe voltage, the current limiting value can be adjusted by inputting a control signal through the control terminal CTRL to restore the original output power. For example, when it is necessary to reduce the current limiting value, please refer to Figure 7 , by inputting a control signal through the control terminal CTRL of the audio and boost adaptive circuit 10, the control signal is a pulse signal, the pulse high-level width (THIL) range is 10us < THIL < 30us, the pulse low-level width (TLOL) range is 10us < TLOL < 30us, the pulse low-level hold time (TOFFL) range for entering the off mode is TOFFL > 100us, and the total current is reduced by 6% for each rising edge; when it is necessary to increase the current limiting value, please refer to Figure 8 , the control signal applied to the control terminal CTRL, its pulse high-level width (THIH) range is 60us < THIH < 80us, the pulse low-level width (TLOH) range is 60us < TLOH < 80us, the pulse low-level hold time (TOFFH) range for entering the off mode is TOFFH > 100us, and the total current is increased by 6% for each rising edge, thereby realizing the adjustment of the internal current limiting value of the chip, and further adjusting the power of the drive voltage signal output to the audio processing circuit 20.

[0059] Please refer to Figure 2 , in one embodiment, the audio processing circuit 20 includes: an audio control unit 21 and an audio driving unit 22.

[0060] The audio control unit 21 is connected to the audio detection circuit 13 and is configured to perform operational amplification processing on the audio input signal to generate a target audio signal and generate an audio gain signal according to the target audio signal; the audio driving unit 22 is connected to the audio control unit 21 and the audio playback component and is configured to generate an audio output signal according to the audio gain signal and the drive voltage signal to the audio playback component for playback.

[0061] In a specific implementation, the audio control unit 21 includes an operational amplifier, which can perform operational amplification processing on the input audio input signal to generate a target audio signal, and automatically adjust the matching audio gain coefficient according to the result of detecting the amplitude of the target audio signal to generate an audio gain signal, wherein the audio gain signal may include a left channel audio gain signal and a right channel audio gain signal. Optionally, the audio driving unit 22 includes a left channel audio driving unit and a right channel audio driving unit, so as to generate and output a left channel audio output signal and a right channel audio output signal to an audio playback component (SPK) for playback according to the driving voltage signal and the left and right channel audio gains. The audio load includes an audio playback component and an audio driving unit 22, etc., wherein the audio playback component may use a speaker SPK (also called a speaker). This embodiment can achieve dynamic matching of the output driving voltage signal and the audio load, ensure the output audio quality, and ensure that the sound quality is not deteriorated due to changes in the power supply voltage of the battery power supply. It also enables customers to achieve plug-and-play of the battery power supply when choosing different power supply methods, without the need to redesign the boost solution and change the printed circuit board (PCB board), thereby reducing costs, improving overall efficiency, making application more convenient, and enhancing the audio playback experience.

[0062] In one embodiment, the power detection circuit 11 includes: a voltage sampling unit 111, a comparison unit 112 and a first logic processing unit 113

[0063] A voltage sampling unit 111 is connected to the power supply and configured to detect the power supply signal provided by the power supply to generate a voltage detection signal; a comparison unit 112 is connected to the voltage sampling unit 111 and configured to compare the voltage detection signal with a preset voltage reference signal, and compare the duration of the voltage detection signal with the first reference duration, and generate a target voltage comparison signal according to the comparison result; a first logic processing unit 113 is connected to the comparison unit 112, the reference voltage generating circuit 12 and the output voltage control circuit 14, and configured to generate a power level signal according to the target voltage comparison signal.

[0064] In a specific implementation, the comparison unit 112 includes a voltage comparison module and a time comparison module, wherein the voltage comparison module compares the voltage detection signal with a preset voltage reference signal to generate an original voltage comparison signal; the time comparison module includes a timing circuit, which times the duration of the original voltage comparison signal through the timing circuit, thereby comparing the duration of the original voltage comparison signal with the first reference duration, that is, indirectly timing the duration of the voltage detection signal and comparing the duration of the voltage detection signal with the first reference duration, and generating a power level signal according to the comparison result of the voltage detection signal with the preset voltage reference signal and the comparison result of the duration of the voltage detection signal with the first reference duration. Optionally, different power level signals indicate that the battery power supply is powered by lithium batteries of different numbers, for example, S, D, and T represent the first power level signal, the second power level signal, and the third power level signal, respectively, corresponding to one lithium battery power supply, two lithium batteries power supply, and three lithium batteries power supply, respectively, so as to realize automatic identification of the number of lithium batteries contained in the battery power supply and automatic identification of the power supply level of the battery power supply.

[0065] See also Figure 4 In one embodiment, the voltage sampling unit 111 includes: a first resistor R1, a second resistor R2 and a third resistor R3; wherein a first end of the first resistor R1 is connected to a power supply signal end, a second end of the first resistor R1 and a first end of the second resistor R2 are connected to a comparison unit 112, a second end of the second resistor R2 and a first end of the third resistor R3 are connected to the comparison unit 112, and a second end of the third resistor R3 is connected to a power ground.

[0066] The voltage comparison module in the comparison unit 112 includes a first comparator U1 and a second comparator U2; wherein the non-inverting input terminal of the first comparator U1 and the non-inverting input terminal of the second comparator U2 are connected to the voltage sampling unit 111, the inverting input terminal of the first comparator U1 and the inverting input terminal of the second comparator U2 are connected to the first reference voltage signal terminal, and the output terminal of the first comparator U1 and the output terminal of the second comparator U2 are connected to the time comparison module in the comparison unit 112. Optionally, the time comparison module in the comparison unit 112 includes a first time comparison circuit COMP_T1 and a second time comparison circuit COMP_T2, which are respectively connected to the output terminal of the first comparator U1 and the output terminal of the second comparator U2, and can respectively time the first sub-original voltage comparison signal and the second sub-original voltage comparison signal output by the first comparator U1 and the second comparator U2, and compare the duration of the first sub-original voltage comparison signal and the second sub-original voltage comparison signal with the first reference duration Tim, and respectively generate and output the first sub-target voltage comparison signal OUT1 and the second sub-target voltage comparison signal OUT2 to the first logic processing unit 113 according to the comparison result. The original voltage comparison signal includes a first sub-original voltage comparison signal and a second sub-original voltage comparison signal; the target voltage comparison signal includes a first sub-target voltage comparison signal OUT1 and a second sub-target voltage comparison signal OUT2.

[0067] In a specific implementation, the first resistor R1, the second resistor R2 and the third resistor R3 perform voltage sampling on the power supply signal (VBAT) output by the power supply, and output the first sub-voltage detection signal VD1 from the first end of the second resistor R2, and output the second sub-voltage detection signal VD2 from the first end of the third resistor R3; wherein the voltage detection signal includes the first sub-voltage detection signal VD1 and the second sub-voltage detection signal VD2. The first reference voltage signal end outputs the first preset reference voltage signal VREF1. The first comparator U1 compares the first sub-voltage detection signal VD1 with the first preset reference voltage signal VREF1 to generate a first sub-original voltage comparison signal; the second comparator U2 compares the second sub-voltage detection signal VD2 with the first preset reference voltage signal VREF1 to generate a second sub-original voltage comparison signal. Optionally, the voltage comparison signal is a logic level signal, for example, when the first sub-voltage detection signal VD1 is less than the first preset reference voltage signal VREF1 and the duration of the first sub-voltage detection signal VD1 is greater than or equal to the first reference duration, the first sub-target voltage comparison signal OUT1 outputs a logic level signal 0.

[0068] The first logic processing unit 113 receives and generates a power level signal according to the first sub-target voltage comparison signal OUT1 and the second sub-target voltage comparison signal OUT2. For example, when the first sub-target voltage comparison signal OUT1=0 and the second sub-target voltage comparison signal OUT2=0, it is determined that the battery power is powered by one lithium battery, and a first power level signal S is generated accordingly; when one of the first sub-target voltage comparison signal OUT1 and the second sub-target voltage comparison signal OUT2 is 1 and the other is 0, it is determined that the battery power is powered by two lithium batteries, and a second power level signal D is generated accordingly; when the first sub-target voltage comparison signal OUT1=1 and the second sub-target voltage comparison signal OUT2=1, it is determined that the battery power is powered by three lithium batteries, and a third power level signal T is generated accordingly.

[0069] The embodiment of the present application improves the reliability of battery power level identification by increasing the duration judgment of the voltage detection signal, and can conveniently perform automatic identification of multiple lithium batteries (for example, three batteries) without changing the original software and hardware design, without requiring external pins to implement the identification of multiple lithium batteries, without occupying additional chip pins, and realizing plug-and-play of battery power, saving the update cost caused by changes in the power supply method, and improving the convenience of using audio equipment.

[0070] See also Figure 5 In one embodiment, the audio detection circuit 13 includes: a plurality of audio amplitude detection units 131 and a second logic processing unit 132 .

[0071] Multiple audio amplitude detection units 131 are all connected to the reference voltage generating circuit 12 and the audio processing circuit 20, each audio amplitude detection unit 131 is configured to detect the amplitude of the target audio signal to generate an audio detection signal, and compare the audio detection signal with the peak voltage reference signal, and generate an audio gear signal according to the comparison result; the second logic processing unit 132 is connected to the audio amplitude detection unit 131 and the output voltage control circuit 14, and is configured to generate an audio level signal according to the audio gear signal.

[0072] In a specific implementation, the reference voltage generating circuit 12 can generate multiple groups of peak voltage reference signals according to the power level signal, for example, three groups of peak voltage reference signals: REFP1 and REFN1, REFP2 and REFN2, and REFP3 and REFN3, thereby dividing the comparison range into three gears, and the audio detection circuit 13 correspondingly includes three audio amplitude detection units 131 (PEAK_DET1, PEAK_DET3, PEAK_DET3). The three audio amplitude detection units 131 compare the audio detection signals obtained by detecting the amplitude of the target audio signal with the peak voltage reference signals of the three gears respectively, thereby obtaining audio gear signals. The second logic processing unit 132 performs logic judgment and processing on the audio gear signal to generate an audio level signal. For example, when the audio detection signal is within the range of the first group of peak voltage reference signals REFP1 and REFN1, a first audio level signal FBS1 is generated; when the audio detection signal is within the range of the second group of peak voltage reference signals REFP2 and REFN2 and is greater than the range of the first group of peak voltage reference signals REFP1 and REFN1, a second audio level signal FBS2 is generated; when the audio detection signal is within the range of the third group of peak voltage reference signals REFP3 and REFN3 and is greater than the range of the second group of peak voltage reference signals REFP2 and REFN2, a third audio level signal FBS3 is generated; when the audio detection signal is greater than the range of the third group of peak voltage reference signals REFP3 and REFN3, a fourth audio level signal FBS4 is generated.

[0073] See also Figure 6 In one embodiment, the output voltage control circuit 14 includes: a voltage dividing unit 141 , a first gating control unit 142 and a second gating control unit 143 .

[0074] The voltage divider unit 141 is connected to the voltage regulating circuit 15, and is configured to perform feedback voltage division on the driving voltage signal output by the voltage regulating circuit 15 to generate multiple groups of voltage gear signals; wherein each group of the voltage gear signals includes voltage gear signals of multiple voltage levels; the first selection control unit 142 is connected to the power supply detection circuit 11 and the voltage divider unit 141, and is configured to select and output a corresponding group of voltage gear signals from the multiple voltage gear signals according to the power supply level signal; the second selection control unit 143 is connected to the first selection control unit 142 and the voltage regulating circuit 15, and is configured to select and output one voltage gear signal from the group of voltage gear signals selected to be output by the first selection control unit 142 according to the audio level signal, so as to obtain a voltage gear signal.

[0075] In a specific implementation, the first selection control unit 142 includes multiple data selectors (MUX), for example, data selector MUX3_1, data selector MUX3_2, data selector MUX3_3 and data selector MUX3_4, a total of four data selectors (MUX). The number of data selectors can be determined according to the power level signal (T, D, S), that is, according to the number of lithium batteries. The second selection control unit 143 includes a data selector MUX4_1, which can select and output one of the voltage gear signals output by the first selection control unit 142 according to the audio level signal (FBS1, FBS2, FBS3, FBS4) to obtain a voltage gear signal. For example, when the power level signal S=1, D=0, T=0, it indicates that the battery power source is in a lithium battery working mode. The four data selectors (MUX3_1, MUX3_2, MUX3_3, MUX3_4) of the first selection control unit 142 select and output the first group of voltage gear signals (HSV1, HSV2, HSV3, HSV4). The data selector MUX4_1 selects and outputs one of the first group of voltage gear signals (HSV1, HSV2, HSV3, HSV4) according to the audio level signal. One, for example, when the audio level signal is FBS1, the data selector MUX4_1 selects to output HSV1; when the audio level signal is FBS2, the data selector MUX4_1 selects to output HSV2; when the audio level signal is FBS3, the data selector MUX4_1 selects to output HSV3; when the audio level signal is FBS4, the data selector MUX4_1 selects to output HSV4; after the voltage regulating circuit 15 performs voltage regulation on the voltage gear signal output by the data selector MUX4_1, the driving voltage signal VOUT output to the audio load corresponds to a voltage range of Vbypass1 to 10V, wherein when Vbypass1 is powered by a lithium battery and the battery voltage is not boosted, the output driving voltage signal has a value equal to the power supply voltage value provided by a lithium battery. Similarly, by analogy, other power level signals (such as D and T power level signals) and audio level signals correspond to the selected output voltage range signals, so as to realize the selection of power levels under different lithium battery working modes through the first selection control unit 142, and realize the selection of voltage ranges under different power modes through the second selection control unit 143.Optionally, the power level signal is D, the battery power supply is in a two-cell lithium battery working mode, and the voltage range corresponding to the driving voltage signal VOUT output to the audio load is Vbypass2~14.5V; the power level signal is T, the battery power supply is in a three-cell lithium battery working mode, and the voltage range corresponding to the driving voltage signal VOUT output to the audio load is Vbypass3~16V; thereby, the maximum power of the audio processing circuit 20 can reach 30W, and the maximum load capacity of the voltage regulation circuit 15 can reach 4A, thereby improving the overall efficiency of the audio and boost adaptive circuit 10.

[0076] A second aspect of the present application provides a boost chip, which includes the audio and boost adaptive circuit 10 as described above.

[0077] In a specific implementation, the boost chip also includes a control terminal CTRL for inputting a control signal output by the main control circuit. Optionally, the boost chip also includes an over-protection circuit, such as an overcurrent protection circuit, an overheat protection circuit, and a short circuit protection circuit, etc., which can ensure the reliability and stability of the chip in various application environments.

[0078] The boost chip of this embodiment can automatically and reliably detect and identify the number (number of cells) of lithium batteries in the connected battery power supply, and dynamically match the battery power supply voltage boost value (that is, the driving voltage signal) with the audio load by detecting the audio signal, thereby ensuring the sound quality of the output audio and enabling customers to plug and play the battery power supply when selecting different power supply modes. There is no need to redesign the boost scheme and change the printed circuit board (PCB board), thereby reducing costs. The dynamic boost circuit and the audio circuit are integrated together, thereby greatly saving the area of ​​the PCB board in the application, improving the overall power application efficiency, and making the product application more convenient. At the same time, it can effectively avoid the situation in which when the voltage of the battery power supply is too low, the audio load needs to draw a large current to meet the power requirement, resulting in a change in sound quality or the main control circuit is pulled dead and shut down, thereby avoiding the waste of battery power and improving the battery life.

[0079] A third aspect of the present application provides an audio power amplifier, which includes the audio and boost adaptive circuit 10 as described above or the boost chip as described above.

[0080] In a specific implementation, the audio amplifier also includes an audio playback component (such as a speaker), which can achieve dynamic matching of the battery power supply voltage boost value and the audio load, ensure the sound quality of the output audio, and enable customers to achieve plug-and-play of the battery power supply when choosing different power supply methods. There is no need to redesign the boost scheme and change the printed circuit board (PCB board), which reduces costs and saves the area of ​​the PCB board in the application, improves the overall power application efficiency, and makes the audio amplifier more convenient to use; at the same time, it can effectively avoid the situation where the sound quality changes or the shutdown caused by the main control circuit being pulled dead when the battery power voltage is too low due to the mismatch between the audio load and the output power, thereby improving the battery life of the audio amplifier.

[0081] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units, modules, and circuits is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional units, modules, and circuits as needed, that is, the internal structure of the device can be divided into different functional units or modules or circuits to complete all or part of the functions described above. The functional units, modules, and circuits in the embodiments can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units, modules, and circuits are only for the convenience of distinguishing from each other, and are not used to limit the scope of protection of this application.

[0082] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described or recorded in detail in one embodiment, reference can be made to the relevant description of other embodiments. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0083] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An audio and boost adaptive circuit, connected to a power supply and an audio processing circuit, characterized in that: The audio and boost adaptive circuit comprises: a power detection circuit configured to detect a power supply signal provided by the power supply to generate a voltage detection signal, compare the voltage detection signal with a preset voltage reference signal, and compare the duration of the voltage detection signal with a first reference duration, and generate a power level signal according to the comparison result; a reference voltage generating circuit, connected to the power detection circuit, and configured to generate a peak voltage reference signal according to the power level signal; an audio detection circuit, connected to the audio processing circuit, configured to detect the amplitude of the target audio signal to generate an audio detection signal, and compare the audio detection signal with the peak voltage reference signal, and generate an audio level signal according to the comparison result; an output voltage control circuit, connected to the power detection circuit and the audio detection circuit, and configured to obtain a voltage gear signal according to the power level signal and the audio level signal; a voltage regulating circuit, connected to the output voltage control circuit and the audio processing circuit, and configured to generate a driving voltage signal according to the voltage gear signal to supply power to the audio processing circuit; The audio and boost adaptive circuit also includes: an output power adjustment circuit, connected to the voltage adjustment circuit, and configured to adjust the power of the driving voltage signal according to a control signal; The output power adjustment circuit comprises: A third logic processing unit, configured to generate a power adjustment signal according to the input control signal; a power regulating unit connected to the third logic processing unit and the voltage regulating circuit, and configured to regulate the power of the driving voltage signal according to the power regulating signal; The power detection circuit comprises: a voltage sampling unit, connected to the power supply and configured to detect a power supply signal provided by the power supply to generate a voltage detection signal; a comparison unit connected to the voltage sampling unit, configured to compare the voltage detection signal with the preset voltage reference signal, and to compare the duration of the voltage detection signal with the first reference duration, and to generate a target voltage comparison signal according to the comparison result; The first logic processing unit is connected to the comparison unit, the reference voltage generation circuit and the output voltage control circuit, and is configured to generate the power level signal according to the target voltage comparison signal.

2. The audio and boost adaptive circuit as claimed in claim 1, characterized in that: The audio detection circuit comprises: A plurality of audio amplitude detection units, each of which is connected to the reference voltage generating circuit and the audio processing circuit, and each of which is configured to detect the amplitude of the target audio signal to generate an audio detection signal, and compare the audio detection signal with the peak voltage reference signal, and generate an audio gear signal according to the comparison result; The second logic processing unit is connected to the audio amplitude detection unit and the output voltage control circuit, and is configured to generate the audio level signal according to the audio gear signal.

3. The audio and boost adaptive circuit as claimed in claim 1, characterized in that: The output voltage control circuit comprises: A voltage dividing unit connected to the voltage regulating circuit and configured to perform feedback voltage division on the driving voltage signal output by the voltage regulating circuit to generate a plurality of sets of voltage gear signals; A first gating control unit, connected to the power detection circuit and the voltage dividing unit, configured to select and output a corresponding group of voltage gear signals from a plurality of groups of voltage gear signals according to the power level signal; wherein each group of the voltage gear signals includes voltage gear signals of a plurality of voltage levels; A second gating control unit is connected to the first gating control unit and the voltage regulating circuit, and is configured to select and output one voltage gear signal from a group of voltage gear signals selected and output by the first gating control unit according to the audio level signal.

4. The audio and boost adaptive circuit as claimed in claim 1, characterized in that: The audio processing circuit comprises: an audio control unit, connected to the audio detection circuit, configured to perform operational amplification processing on the audio input signal to generate the target audio signal, and generate an audio gain signal according to the target audio signal; The audio driving unit is connected to the audio control unit and the audio playing component, and is configured to generate an audio output signal according to the audio gain signal and the driving voltage signal to the audio playing component for playing.

5. The audio and boost adaptive circuit as claimed in claim 1, characterized in that: The voltage sampling unit includes: a first resistor, a second resistor and a third resistor; wherein the first end of the first resistor is connected to the power supply signal end, the second end of the first resistor and the first end of the second resistor are commonly connected to the comparison unit, the second end of the second resistor and the first end of the third resistor are commonly connected to the comparison unit, and the second end of the third resistor is connected to the power ground.

6. A boost chip, characterized in that: The boost chip comprises the audio and boost adaptive circuit as claimed in any one of claims 1 to 5.

7. An audio power amplifier, characterized in that: The audio power amplifier comprises: the audio and boost adaptive circuit as described in any one of claims 1 to 5 or the boost chip as described in claim 6.

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