CN106535052B

CN106535052B - Audio self-adaptive BOOST circuit, BOOST chip and audio equipment

Info

Publication number: CN106535052B
Application number: CN201611263207.3A
Authority: CN
Inventors: 裴晓东; 李明; 许志刚
Original assignee: Shenzhen Anatek Electronic Technology Co ltd
Current assignee: Shenzhen Anatek Electronic Technology Co ltd
Priority date: 2016-12-30
Filing date: 2016-12-30
Publication date: 2022-09-02
Anticipated expiration: 2036-12-30
Also published as: CN106535052A

Abstract

The invention is suitable for the field of integrated circuits, and provides an audio self-adaptive BOOST circuit, a BOOST chip and audio equipment, wherein the audio self-adaptive BOOST circuit comprises: the input voltage detection unit is used for detecting and judging the voltage gear of the power supply and correspondingly generating a power supply voltage gear signal; the audio signal detection unit detects the voltage amplitude of the audio input signal and generates an audio amplitude level signal according to the voltage amplitude of the audio signal; the voltage control unit selects a corresponding voltage gear according to the power supply voltage gear signal and selects a boosting control signal of a corresponding voltage grade in the selected voltage gear according to the audio amplitude grade signal; and a boosting unit for boosting according to the boosting control signal. The invention automatically detects the electric quantity of the power supply, correspondingly selects the boosting range, enlarges the boosting range, reduces the loss, further adjusts the boosting output according to the audio frequency, keeps the matching of the boosting gain and the audio frequency gain and reduces the loss to the lowest.

Description

Audio self-adaptive BOOST circuit, BOOST chip and audio equipment

Technical Field

The invention belongs to the field of integrated circuits, and particularly relates to an audio self-adaptive BOOST circuit, a BOOST chip and audio equipment.

Background

As portable audio devices have rapidly spread around the world in recent years, and battery-powered audio devices have rapidly developed, portable audio devices have also placed increasing demands on battery-powered cruising ability. For improving the endurance of the battery, two aspects are taken into consideration: firstly, the capacity of the battery is improved; secondly, improve the work efficiency of battery, reduce the loss. For increasing the battery capacity, due to the limitation of the volume, the portability and the cruising ability of the audio device have irreconcilable contradiction, so reducing the loss becomes the key for improving the cruising ability of the audio device at present.

In the prior art, a BOOST (BOOST) circuit is used as an indispensable power supply unit for audio processing, and in order to meet the power supply requirement of high-power audio processing, a high voltage range is always kept to be output during low-power audio processing, so that power loss is large, and cruising ability is seriously affected.

Disclosure of Invention

The embodiment of the invention aims to provide an audio self-adaptive booster circuit, and aims to solve the problem that the existing booster circuit cannot adjust the voltage output range to adapt to boosting requirements of different audio power amplifiers, so that the power loss is large.

The embodiment of the invention is realized in such a way that an audio self-adaptive booster circuit is connected with a power supply and an audio processing unit, and the circuit comprises:

the input voltage detection unit is used for detecting and judging the voltage gear of the power supply and correspondingly generating a power supply voltage gear signal, and the power supply detection end of the input voltage detection unit is connected with the power supply;

the audio signal detection unit is used for detecting the voltage amplitude of an audio input signal and generating an audio amplitude level signal according to the voltage amplitude of the audio signal, and the input end of the audio signal detection unit is connected with the audio input end of the audio processing unit through an external resistor RA1 and an external resistor RA 2;

the voltage control unit is used for selecting a corresponding voltage gear according to a power supply voltage gear signal and selecting a boost control signal of a corresponding voltage grade in the selected voltage gear according to the audio amplitude grade signal, a gear control end of the voltage control unit is connected with an output end of the input voltage detection unit, and a grade control end of the voltage control unit is connected with an output end of the audio signal detection unit;

the boosting unit is used for boosting according to the boosting control signal, outputting boosting potential to supply power to the audio processing unit, the input end of the boosting unit is connected with the output end of the voltage control unit, and the output end of the boosting unit is connected with the input end of the voltage control unit and the power supply end of the audio processing unit.

Another objective of the embodiments of the present invention is to provide a BOOST chip including the audio adaptive BOOST circuit.

Another object of the embodiments of the present invention is to provide an audio device including the above BOOST chip.

According to the embodiment of the invention, the voltage gear of the power supply electric quantity is detected and judged through the input voltage detection unit, the high voltage boosting range is output when the electric quantity is high, and the low voltage boosting range is output when the electric quantity is low, so that the input boosting range is effectively improved, the boosting requirement of high-power audio equipment can be met, the loss of low-power audio is reduced, the endurance time of a battery is prolonged, and the control is flexible and the cost is low;

secondly, a voltage signal of a corresponding grade is selected and output by the audio signal detection unit according to the size of the audio signal, and the matching of the boost output and the audio amplitude is realized, so that the power loss of the circuit is further reduced;

in addition, the gain of the boosting unit can be adjusted through the external resistor, so that the gain of the boosting unit is kept matched with the gain of the audio processing, and the working loss is reduced to the minimum.

Drawings

Fig. 1 is a structural diagram of an audio adaptive boost circuit according to an embodiment of the present invention;

fig. 2 is a circuit diagram illustrating an exemplary input voltage detecting unit in an audio adaptive boost circuit according to an embodiment of the present invention;

fig. 3 is a circuit diagram illustrating an exemplary audio signal detecting unit in an audio adaptive boost circuit according to an embodiment of the present invention;

fig. 4 is a circuit diagram illustrating an exemplary voltage control unit in an audio adaptive boost circuit according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The embodiment of the invention automatically detects the power supply electric quantity, outputs a high-voltage boosting range when the electric quantity is high, and outputs a low-voltage boosting range when the electric quantity is low, thereby effectively improving the input boosting range, meeting the boosting requirement of high-power audio equipment, reducing the loss of low-power audio, prolonging the endurance time of a battery, and having flexible control and low cost; and further select to output the voltage signal of the corresponding grade according to the magnitude of the audio signal, realize the matching of boost output and audio amplitude, have further reduced the power loss of the circuit; in addition, the gain of the boost can be adjusted to keep the gain of the boost matched with the gain of the audio processing, so that the working loss is reduced to the minimum.

Fig. 1 shows a structure of an audio adaptive boost circuit provided by an embodiment of the present invention, and for convenience of explanation, only the parts related to the present invention are shown.

As an embodiment of the present invention, the audio adaptive BOOST circuit may be packaged in various BOOST chips, and further applied to audio devices such as a sound box, a karaoke device, and the like, and audio units of mobile phones or electronic products.

As an embodiment of the present invention, the audio adaptive voltage boost circuit 1 is connected to a power supply and an audio processing unit 2, and includes:

the input voltage detection unit 11 is configured to detect and determine a voltage tap of the power supply, and generate a power supply voltage tap signal correspondingly, where a power supply detection terminal VBAT of the input voltage detection unit 11 is connected to the power supply.

In the embodiment of the present invention, the power voltage step signal may be implemented by a logic signal with multiple bits, including a high-level voltage signal and a low-level voltage signal, for example, when the input voltage detection unit 11 has two output terminals to output the logic signals HD and HS, respectively, the power voltage step signal is a low-level voltage signal when the logic signal HD is 0 and HS is 1, and the power voltage step signal is a high-level voltage signal when the logic signal HD is 1 and HS is 0.

Further, a first threshold value may be preset in the input voltage detection unit 11, and the high-range voltage signal may be generated when the voltage of the power supply is greater than the first threshold value, and the low-range voltage signal may be generated when the voltage of the power supply is less than the first threshold value.

Of course, the power voltage step signal may also be divided into three or more steps, such as a high-step voltage signal, a middle-step voltage signal and a low-step voltage signal, and two threshold values, a first threshold value and a second threshold value, are preset in the input voltage detection unit 11, where the first threshold value is smaller than the second threshold value, the high-step voltage signal is generated when the voltage of the power is greater than the second threshold value, the middle-step voltage signal is generated when the voltage of the power is smaller than the second threshold value and greater than the first threshold value, and the low-step voltage signal is generated when the voltage of the power is smaller than the first threshold value.

Preferably, the third gear detection can also be realized by adding an external control signal HT, and specifically, the input voltage detection unit 11 further includes an external control terminal, through which the external control signal HT is received;

when the external control signal HT is at a high level, the input voltage detecting unit 11 generates a high-level voltage signal;

when the external control signal HT is at a low level, the shift of the power supply voltage shift signal is determined by a first threshold preset in the input voltage detection unit 11, and when the voltage of the power supply is greater than the first threshold, a middle-shift voltage signal is generated, and when the voltage of the power supply is less than the first threshold, a low-shift voltage signal is generated.

The threshold may be generated by providing a reference cell in the audio adaptive booster circuit 1, or may be generated by multiplexing the reference cells in the booster cell 14 and providing the multiplexed reference cells from the booster cell 14.

The embodiment of the invention can automatically detect when one battery and two batteries supply power, can flexibly control the boosting output range only through one control pin when three batteries supply power, can meet the boosting requirement of high-power audio, and can reduce the loss of low-power audio during working.

In addition, the power supply can be a large-capacity storage battery, a dry battery, a lithium battery or a direct-current power supply, when the large-capacity storage battery is detected, the electric quantity of the battery is detected, when the small-capacity dry battery or lithium battery is detected, the number of the batteries can be detected, for example, one battery, two batteries or three batteries are currently detected, the range of the boost output VOUT is controlled according to the electric quantity of the battery or the number of the batteries, for example, when the current power supply is detected to be one battery, a low-gear voltage signal is generated, the voltage gear corresponds to a voltage range of the boost output, for example, the boost output corresponding to the low-gear voltage signal is 5V-10V, when the current power supply is two batteries, a middle-gear voltage signal is generated, the boost output corresponds to 9V-15V, when the current power supply is three batteries, a high-range voltage signal is generated, corresponding to a boost output of 14V-18V, and a corresponding level of voltage signal output may be selected in this range further based on the voltage magnitude (or power) of the audio input signal.

The Audio signal detecting unit 12 is configured to detect a voltage amplitude of an Audio input signal, and generate an Audio amplitude level signal according to the voltage amplitude of the Audio signal, an input end of the Audio signal detecting unit 12 may be a single input end for receiving a monaural Audio signal, or a dual input end for receiving a binaural Audio signal, taking a binaural as an example, the dual input ends a _ INL and a _ INR of the Audio signal detecting unit 12 are connected to the Audio input end Audio _ L, Audio _ R of the Audio processing unit 2 through an external resistor RA1 and an external resistor RA 2.

In the embodiment of the present invention, the external resistors RA1 and RA2 refer to resistors connected outside the chip, the audio amplitude level signal can be implemented by multiple-bit logic signals FBS1, FBS2, FBS3, and FBS4, and when the voltage amplitude or power of the audio input signal is detected to be large, an audio amplitude level signal of a first level is generated, and FBS1 is 1, FBS2 is 0, FBS3 is 0, and FBS4 is 0; generating an audio amplitude level signal FBS1 of a fourth level 0, FBS2 0, FBS3 0, FBS4 1 when the voltage amplitude or power of the audio input signal is detected to be small; of course, more levels can be divided in a voltage range by more bits of logic signals, and this is not limited here.

And the voltage control unit 13 is configured to select a corresponding voltage tap according to the power supply voltage tap signal, and select a corresponding voltage class signal in the selected voltage tap according to the audio amplitude class signal, where a tap control end of the voltage control unit 13 is connected to the output ends HD and HS of the input voltage detection unit 11, and a tap control end of the voltage control unit 13 is connected to the output end of the audio signal detection unit 12.

When the input voltage detecting unit 11 has an external control terminal, a shift control terminal of the voltage control unit 13 should be connected to the external control terminal of the input voltage detecting unit 11, and the external control signal HT is simultaneously used as a logic bit in the power voltage shift signal of the voltage control unit 13.

And the boosting unit 14 is used for boosting the voltage level signal, outputting a boosted potential to supply power to the audio processing unit 2, wherein the input end of the boosting unit 14 is connected with the output end of the voltage control unit 13, and the output end of the boosting unit 14 is simultaneously connected with the input end of the voltage control unit 13 and the power supply end of the audio processing unit 2.

In the embodiment of the present invention, in operation, the input voltage detecting unit 11 first detects the level of the external control signal HT, and when HT is equal to 1, determines that the current input power is high (three batteries); when HT is equal to 0, continuing to detect the power supply voltage, if the time length of the power supply voltage lower than the first threshold value exceeds a first delay time length, judging that the current input power supply is low (one battery), outputting a logic signal HD equal to 0, and HS equal to 1; when HT is 0 and the duration of the power supply voltage higher than the first threshold exceeds the second delay duration, it is determined that the current input power supply is a medium battery (two batteries), the output logic signal HD is 1, HS is 0, the first and second delay durations may be set in the order of milliseconds, and the first and second delay durations may be set in a range.

As a preferred embodiment of the present invention, HT may be set to 1 (high level) by connecting the external control terminal to the system voltage VDD, and HT may be set to 0 (low level) by connecting the external control terminal to ground through the pull-down resistor.

Then, the audio signal detection unit 12 detects the voltage amplitude of the audio input signal, and generates audio amplitude level signals FBS1, FBS2, FBS3 and FBS4, the voltage control unit 13 generates a voltage level signal FB by determining the range and level of the output voltage according to HT, HD, HS, and FBS1, FBS2, FBS3 and FBS4, and finally, the boost unit 14 boosts the FB to supply power to the audio processing unit 2.

secondly, a voltage signal of a corresponding grade is selected and output by the audio signal detection unit according to the size of the audio signal, and the matching of the boosting output and the audio amplitude is realized, so that the power loss of the circuit is further reduced;

in addition, the gain of the boosting unit can be adjusted through an external resistor, so that the gain of the boosting unit is kept matched with the gain of the audio processing, and the working loss is reduced to the minimum.

Fig. 2 shows an exemplary circuit structure of an input voltage detection unit in an audio adaptive boost circuit provided by an embodiment of the present invention, and only the relevant parts to the present invention are shown for convenience of explanation.

As an embodiment of the present invention, the input voltage detecting unit 11 includes:

the first voltage dividing module 111 is configured to divide the power voltage, and an input end of the first voltage dividing module 111 is a power detection end of the input voltage detection unit 11.

Preferably, the first voltage division module 111 includes a resistor R1 and a resistor R2;

one end of the resistor R1 is an input end of the first voltage division module 111, and the other end of the resistor R1 is an output end of the first voltage division module 111 and is grounded through a resistor R2.

The comparing module 112 is configured to compare the divided power supply voltage with a first threshold value, and generate a power level determining signal, a positive input end of the comparing module 112 is connected to an output end of the first voltage dividing module 111, and a negative input end of the comparing module 112 receives the first threshold value.

Preferably, the comparing module 112 is a comparator COMP, a positive input end of the comparator COMP is a positive input end of the comparing module 112, a negative input end of the comparator COMP is a negative input end of the comparing module 112, and an output end of the comparator COMP is an output end of the comparing module 112.

The first logic module 113 is configured to generate a power supply voltage step signal according to the external control signal HT and the power supply level determination signal, a first input end of the first logic module 113 is an external control end of the input voltage detection unit 11, a second input end of the first logic module 113 is connected to an output end of the comparison module 112, and a first output end and a second output end of the first logic module 113 are both output ends of the input voltage detection unit 11.

Preferably, the first threshold is a reference signal VREF provided by the voltage boosting unit 14.

In the embodiment of the present invention, the power supply voltage divides the output voltage VDIV through the resistor R1 and the resistor R2, and the output voltage VDIV is used as the positive input end of the comparator COMP, the negative input end of the comparator may adopt the reference voltage VREF generated inside the circuit, or the reference voltage VREF is provided by an external circuit, when the VDIV obtained after the voltage division by the resistors is lower than VREF, the output end OUT1 of the comparator COMP is equal to 0 and is output to the first logic module 113 as a logic input signal, and HT is equal to 0, the first logic module 113 outputs HD equal to 0 and HS equal to 1, and determines that the current power supply is a battery (low battery), and correspondingly outputs a voltage signal of a low gear; when VDIV obtained after voltage division of the resistor is higher than VREF, the output end OUT1 of the comparator COMP is equal to 1 and is output to the first logic module 113 as a logic input signal, HT is equal to 0, HD is equal to 1 and HS is equal to 0 output by the first logic module 113, it is determined that the current power supply is two batteries (medium electric quantity), and a voltage signal of a middle gear is output correspondingly.

In the embodiment of the invention, the current power supply capacity can be judged according to HS and HD, and HT can control the circuit to enter the output mode corresponding to three batteries (high capacity). When HS is 1, HD is 0, HT is 0, the boost output selects a low-voltage output range of 5V-10V; when HS is 0, HD is 1, HT is 0, selecting a middle-gear boosting voltage output range 9V-15V; when HS is 0, HD is 0, and HT is 1, the high-voltage step-up voltage output range 14V to 18V is selected.

The embodiment of the invention can realize automatic detection of the electric quantity of the power supply, and can realize flexible control of the boost output range through only one control pin, thereby meeting the boost requirement of high-power audio and reducing the working loss of low-power audio.

Fig. 3 shows an exemplary circuit structure of an audio signal detecting unit in an audio adaptive boost circuit provided by an embodiment of the present invention, and only the relevant parts to the present invention are shown for convenience of explanation.

As an embodiment of the present invention, the audio signal detecting unit 12 may have one or more input terminals for detecting a mono or multi-channel audio input signal, and includes:

and a second voltage division module 121, configured to provide a gain setting ratio for the external resistor RA1 and the external resistor RA2, so as to adjust the gain of the voltage boosting unit 14 through the external resistor and the second voltage division module 121, so that the gain of the voltage boosting unit 14 matches the gain of the audio processing unit 2, one or more voltage division output terminals of the second voltage division module 121 are input terminals of the audio signal detection unit 12, and a common mode input terminal of the second voltage division module 121 receives a common mode voltage signal VCOM, which is preferably provided by the voltage boosting unit 14.

Preferably, the second voltage dividing module 121 has a first input terminal a _ INL connected to the left channel Audio input terminal of the Audio processing unit 2 through an external resistor RA1 for receiving the left channel Audio signal Audio _ L, and a second input terminal a _ INR connected to the right channel Audio input terminal of the Audio processing unit 2 through an external resistor RA2 for receiving the right channel Audio signal Audio _ R, and the second voltage dividing module 121 includes: a resistor R3 and a resistor R4;

one end of the resistor R3 is a first input end of the second voltage dividing module 121, the other end of the resistor R3 is a common mode input end of the second voltage dividing module 121 and is connected with one end of the resistor R4, and the other end of the resistor R4 is a second input end of the second voltage dividing module 121.

The differential amplifying module 122 is configured to convert the audio input signal of each channel into a fully differential signal, a first input end of the differential amplifying module is connected to the common mode receiving end of the second voltage division module 121, and a second input end and/or a third input end of the differential converting module 122 are/is one or more input ends of the audio signal detecting unit 12.

Preferably, the differential amplifying module 122 has a first, a second and a third input terminals, a first pair of differential output terminals and a second pair of differential output terminals, and the differential amplifying module 122 includes: a first differential amplifier AMPL and a second differential amplifier AMPR;

the forward differential input end of the first differential amplifier AMPL is the second input end of the differential amplification module 122, the reverse differential input end and the common mode input end of the first differential amplifier AMPL are the first input ends of the differential amplification module 122 at the same time, the forward input end of the second differential amplifier AMPR is the third input end of the differential amplification module 122, the reverse input end and the common mode input end of the second differential amplifier AMPR are the first input ends of the differential amplification module 122 at the same time, the forward output end and the reverse output end of the first differential amplifier AMPL are respectively a first pair of differential output ends of the differential amplification module 122, and the forward output end and the reverse output end of the second differential amplifier AMPR are respectively a second pair of differential output ends of the differential amplification module 122.

And the peak detection modules 123 are configured to perform peak comparison on the fully differential signals and the internal reference voltages in each peak detection module to generate logic control signals, respectively, each peak detection module is connected to one or more pairs of differential output ends of the differential amplification module, and the internal reference voltages in the peak detection modules decrease progressively in a gradient manner to achieve level determination of the voltage amplitude of the audio signal.

Preferably, the audio signal detecting unit 12 includes three PEAK detecting modules, namely a first PEAK detecting module PEAK _ DETA, a second PEAK detecting module PEAK _ DETB, and a third PEAK detecting module PEAK _ DETC, each PEAK detecting module has four input ends, wherein the first and second input ends are connected to the first pair of differential output ends of the differential amplifying module 122, the third and fourth input ends are connected to the second pair of differential output ends of the differential amplifying module 122, and the output ends of the three PEAK detecting modules are connected to the three input ends of the second logic module.

The second logic module 124 is configured to generate an audio amplitude level signal according to the logic control signal generated by the peak detection modules, where a plurality of input ends of the second logic module are respectively connected to output ends of the peak detection modules, and a plurality of output ends of the peak detection modules are output ends of the audio signal detection unit 12.

It is conceivable that if the number of peak detection modules is N, the number of levels of the audio amplitude level signal is N + 1.

In the embodiment of the present invention, the gain of the voltage boosting unit 14 can be changed by adjusting the resistance values of the external resistor RA1 and the external resistor RA2, and a certain functional relationship exists between the external resistor RA1, the external resistor RA2 and the resistor R1, and between the resistor R2 and the gains of the voltage boosting unit 14 and the audio processing unit 2, which specifically includes:

for single-ended audio signals:

for fully differential audio signals:

where B is the gain of the booster unit 14 and a is the gain of the audio processing unit 2.

It can be seen that, by setting the ratio between the external resistor RA1 and the resistor R1, the gain ratio between the audio processing unit 2 and the booster unit 14 can be determined,

therefore, the gain proportional relation between the audio processing unit 2 and the voltage boosting unit 14 can be adjusted by adjusting the resistance values of the external resistor RA1 and the external resistor RA2, so that the gain of the voltage boosting unit 14 is matched with the gain of the audio processing unit 2, and the power loss is reduced.

In the embodiment of the present invention, 12 may detect a monaural audio signal or a binaural audio signal, for detecting a binaural audio signal, two input terminals a _ INL and a _ INR of the audio signal detecting unit 12 receive audio signals of left and right channels, respectively, for detecting a monaural audio signal, either one of the input terminals may be used for receiving, and the other input terminal is floating, and the audio signal input by the audio processing unit 2 may be fully differential or single-ended.

To illustrate the example of receiving the left channel Audio signal with reference to fig. 3, the left channel Audio signal Audio _ L is divided by the peripheral resistor RA1 and the resistor R1 to generate the signal a _ INL, which enters the first differential amplifier AMPL as the positive input terminal of the block, the common mode voltage VCOM is used as the common mode input and the negative input of the AMPL, the left channel audio input signal is converted into fully differential signals INPL and INNL by a first differential amplifier AMPL, and the fully differential signals enter three PEAK detection blocks PEAK _ DECA, PEAK _ DECB and PEAK _ DECC, respectively performing PEAK value comparison, gradually decreasing the internal reference voltage of the three PEAK detection modules PEAK _ DECA, PEAK _ DECB and PEAK _ DECC, when the INPL and INNL signal PEAKs are greater than the PEAK _ DECA, PEAK _ DECB, PEAK _ DECC internal reference signals, PA is 0, PB is 0, PC is 0, the boosting unit is controlled to output the highest-level voltage signal by controlling the boosting unit to output 1 FBS1, 0 FBS2, 0 FBS3 and 0 FBS 4; when the PEAK values of the INPL and the INNL signals are smaller than PEAK _ DECA and larger than the PEAK _ DECB and the PEAK _ DECC internal reference signals, PA is 1, PB is 0, and PC is 0, FBS1 is 0, FBS2 is 1, FBS3 is 0, and FBS4 is 0, so that the boosting unit is controlled to output a next-higher-level voltage signal; when the INPL and INNL signal PEAKs are smaller than PEAK _ DECA and PEAK _ DECB and larger than the PEAK _ DECC internal reference signal, PA is 1, PB is 1, and PC is 0, FBS1 is 0, FBS2 is 0, FBS3 is 1, and FBS4 is 0, the boosting unit is controlled to output a voltage signal of the next lower level, and when the INPL and INNL signal PEAKs are smaller than the PEAK _ DECA, PEAK _ DECB, and PEAK _ DECC internal reference signal, PA is 1, PB is 1, and PC is 1, FBS1 is 0, FBS2 is 0, 3 is 0, and FBS4 is 1, the boosting unit is controlled to output a voltage signal of the lowest level.

It should be noted that the number of peak detection modules is not limited to three, and the number of peak detection circuit stages may be increased or decreased as needed, where the larger the number of peak detection modules is, the larger the number of peak detection stages is, the more the level of the generated audio amplitude level signal is, and if the number of peak detection modules is N, the number of peak detection stages is N, the level of the generated audio amplitude level signal is N + 1.

According to the embodiment of the invention, the detection of the voltage amplitude of the audio signal is realized through the audio signal detection unit, and the boosting value is automatically adjusted according to the voltage amplitude of the audio signal, so that the effect of saving the power consumption of a battery is achieved.

Fig. 4 shows an exemplary circuit structure of a voltage control unit in an audio adaptive boost circuit provided by an embodiment of the present invention, and only the relevant parts to the present invention are shown for convenience of explanation.

As an embodiment of the present invention, the voltage control unit 13 includes:

and the third voltage division module 131 is configured to divide the voltage according to the boosted potential output by the voltage boosting unit 14 to generate a plurality of groups of voltage division signals, each group of voltage division signals has a gradient voltage level, and an input end of the third voltage division module is an input end of the voltage control unit.

Preferably, if the third voltage division module 131 outputs N sets of divided voltage signals, each set of divided voltage signals has M levels of divided voltage signals;

the gear gating module 132 includes M N-out-of-one selectors, each group of the divided voltage signals is connected to the input ends of the N-out-of-one selectors with the same serial number, N control ends of the N-out-of-one selectors are the control ends of the gear gating module 132, and output ends of the N-out-of-one selectors are output ends of the gear gating module 132;

then, the level gating module 133 is an M-out-of-one digital selector, a plurality of input terminals of the M-out-of-one digital selector are input terminals of the level gating module 133, a plurality of control terminals of the M-out-of-one digital selector are a plurality of control terminals of the level gating module 133, and an output terminal of the M-out-of-one digital selector is an output terminal of the level gating module 133.

In the embodiment of the present invention, the output boosted potential VOUT of the voltage boosting unit 14 is used as the input of the third voltage dividing module 131, and the VOUT obtains 12 voltage dividing values through the internal resistance voltage dividing module, and the voltage dividing values are divided into three groups of voltage dividing signals. The first set of divided signals is: HTV1, HTV2, HTV3, HTV 4; the second group of divided signals is: HDV1, HDV2, HDV3, HDV 4; the third set of partial pressure signals is: HSV1, HSV2, HSV3, HSV 4. Taking the first group of divided signals as an example, the voltage relationship is: HTV1 > HTV2 > HTV3 > HTV 4.

A gear gating module 132, configured to select a voltage division signal corresponding to a group of voltage gears according to the power supply voltage gear signal, where multiple input terminals of the gear gating module are correspondingly connected to multiple output terminals of the third voltage division module 131, and multiple control terminals of the gear gating module are multiple gear control terminals of the voltage control unit 13.

Preferably, the gear shift gating module 132 includes a plurality of digital selectors, input terminals of the digital selectors are respectively a plurality of input terminals of the gear shift gating module 132, output terminals of the digital selectors are respectively a plurality of output terminals of the gear shift gating module 132, and a control terminal of each digital selector is simultaneously a plurality of control terminals of the gear shift gating module 132.

With reference to fig. 4, specifically, the gear gating module 132 includes four three-to-one digital selectors MUX3A, MUX3B, MUX3C and MUX3D, three input terminals of the three-to-one digital selector MUX3D are connected to the voltage dividing signals HTV D, HDV D and HSV D, three control terminals of the four three-to-one digital selectors 3D, MUX3D and MUX3D respectively receive the logic signals HT, HD and HS, and the output terminals of the four three-to-one digital selectors MUX3, HV D, D and D, D and the output terminals of the MUX D.

In the embodiment of the present invention, the power voltage shift signal includes logic signals HT, HD, HS, and when HT is equal to 1, HD is equal to 0, and HS is equal to 0, the four one-out-of-three selectors MUX3A, MUX3B, MUX3C, and MUX3D respectively output four levels of first group voltage division signals HTV1, HTV2, HTV3, and HTV4, corresponding to a high voltage output mode of three batteries (high battery);

when HT is 0, HD is 1, and HS is 0, the four three-one selector MUXs 3A, MUX3B, MUX3C, and MUX3D respectively output a second group of divided voltage signals HDV1, HDV2, HDV3, and HDV4 of four levels, corresponding to a medium voltage output mode of two batteries (medium electric quantity);

when HT is 0, HD is 0, and HS is 1, the four three-select one selectors MUX3A, MUX3B, MUX3C, and MUX3D respectively output the third group of voltage division signals HSV1, HSV2, HSV3, and HSV4 of four ranks, corresponding to the low voltage output mode of one battery (low battery).

The level gating module 133 is configured to select a divided voltage signal corresponding to one voltage level from a group of divided voltage signals according to the audio amplitude level signal, and the divided voltage signal is used as a voltage level signal, a plurality of input ends of the level gating module are correspondingly connected to a plurality of output ends of the level gating module, and a plurality of control ends of the level gating module are a plurality of level control ends of the voltage control unit 13.

Preferably, the level gating module 133 is a one-out-of-four multiplexer MUX4, four input terminals of the one-out-of-four multiplexer MUX4 are a plurality of input terminals of the level gating module 133, an output terminal of the one-out-of-four multiplexer MUX4 is an output terminal of the level gating module 133, and four control terminals of the one-out-of-four multiplexer MUX4 are a plurality of control terminals of the level gating module 133.

In the embodiment of the present invention, FBS1, FBS2, FBS3, and FBS4 are MUX4_1 module switch control signals, and when FBS1 is equal to 1, FBS2 is equal to 0, FBS3 is equal to 0, and FBS4 is equal to 0, HV1 is sent to the FB signal; when FBS1 is 0, FBS2 is 1, FBS3 is 0, and FBS4 is 0, HV2 is sent to the FB signal; when FBS1 is 0, FBS2 is 0, FBS3 is 1, and FBS4 is 0, HV3 is sent to the FB signal; HV4 is sent to the FB signal when FBS1 is 0, FBS2 is 0, FBS3 is 0, and FBS4 is 1. The FB signal serves as a feedback signal for the boost unit 14 to regulate the final output voltage VOUT of the boost unit 14.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An audio adaptive boost circuit connected to a power supply and an audio processing unit, the circuit comprising:

the voltage control unit is used for selecting a corresponding voltage gear according to a power supply voltage gear signal and selecting a corresponding voltage grade signal in the selected voltage gear according to the audio amplitude grade signal, a gear control end of the voltage control unit is connected with an output end of the input voltage detection unit, and a grade control end of the voltage control unit is connected with an output end of the audio signal detection unit;

the voltage boosting unit is used for boosting the voltage level signal and outputting a boosted potential to supply power to the audio processing unit, the input end of the voltage boosting unit is connected with the output end of the voltage control unit, and the output end of the voltage boosting unit is simultaneously connected with the input end of the voltage control unit and the power supply end of the audio processing unit;

the power supply voltage step signal comprises a high-grade voltage signal and a low-grade voltage signal, a first threshold value is preset in the input voltage detection unit, the high-grade voltage signal is generated when the voltage of the power supply is greater than the first threshold value, and the low-grade voltage signal is generated when the voltage of the power supply is less than the first threshold value; or

The power supply voltage gear signal comprises a high-grade voltage signal, a medium-grade voltage signal and a low-grade voltage signal, a first threshold value and a second threshold value are preset in the input voltage detection unit, the first threshold value is smaller than the second threshold value, the high-grade voltage signal is generated when the voltage of the power supply is larger than the second threshold value, the medium-grade voltage signal is generated when the voltage of the power supply is smaller than the second threshold value and larger than the first threshold value, and the low-grade voltage signal is generated when the voltage of the power supply is smaller than the first threshold value;

the input voltage detection unit also comprises an external control end, and an external control signal is received through the external control end;

when the external control signal is at a high level, the input voltage detection unit generates a high-grade voltage signal;

when the external control signal is at a low level, judging the gear of the power supply voltage gear signal through a first threshold value preset in the input voltage detection unit, generating a middle-gear voltage signal when the voltage of the power supply is greater than the first threshold value, and generating a low-gear voltage signal when the voltage of the power supply is less than the first threshold value;

the external control signal is at a high level by connecting the external control end with a system voltage VDD, and is at a low level by grounding the external control end through a pull-down resistor; the voltage control unit determines the range and the level of output voltage according to the external control signal, the logic signals HD and HS and the audio amplitude level signal to generate a voltage level signal, and the boosting unit boosts the voltage level signal to supply power to the audio processing unit.

2. The circuit of claim 1, wherein the input voltage detection unit comprises:

the first voltage division module is used for carrying out voltage division processing on the power supply voltage, and the input end of the first voltage division module is a power supply detection end of the input voltage detection unit;

the comparison module is used for comparing the divided power supply voltage with a first threshold value to generate a power supply grade judgment signal, a positive input end of the comparison module is connected with an output end of the first voltage division module, and a negative input end of the comparison module receives the first threshold value;

the first logic module is used for generating the power supply voltage gear signal according to an external control signal and a power supply grade judging signal, a first input end of the first logic module is an external control end of the input voltage detection unit, a second input end of the first logic module is connected with an output end of the comparison module, and a first output end and a second output end of the first logic module are both output ends of the input voltage detection unit;

the first threshold is a reference signal provided by the boosting unit.

3. The circuit of claim 1, wherein the audio signal detection unit has one or more inputs for detecting a mono or multi-channel audio input signal, the audio signal detection unit comprising:

the second voltage division module is used for providing a gain setting proportion for an external resistor, so that the gain of the boosting unit is adjusted through the external resistor and the second voltage division module, the gain of the boosting unit is matched with the gain of the audio processing unit, one or more voltage division output ends of the second voltage division module are input ends of the audio signal detection unit, and a common-mode input end of the second voltage division module receives a common-mode voltage signal;

the differential amplification module is used for converting the audio input signal of each sound channel into a fully differential signal, a first input end of the differential amplification module is connected with a common-mode receiving end of the second voltage division module, and a second input end and/or a third input end of the differential amplification module are/is one or more input ends of the audio signal detection unit;

the peak detection modules are used for performing peak comparison on the fully differential signal and the internal reference voltage in each peak detection module to respectively generate logic control signals, each peak detection module is connected with one or more pairs of differential output ends of the differential amplification module, and the internal reference voltages in the peak detection modules are gradually decreased in a gradient manner to realize grade judgment on the voltage amplitude of the audio signal;

the second logic module is used for generating audio amplitude level signals according to the logic control signals generated by the peak detection modules, a plurality of input ends of the second logic module are respectively and correspondingly connected with output ends of the peak detection modules, and a plurality of output ends of the peak detection modules are output ends of the audio signal detection unit.

4. The circuit of claim 3, wherein the number of peak detection modules is N, the number of levels of the audio amplitude level signal is N + 1;

the common mode voltage signal is provided by the boosting unit.

5. The circuit of claim 1, wherein the voltage control unit comprises:

the third voltage division module is used for dividing voltage according to the boosted potential output by the boosting unit to generate a plurality of groups of divided voltage signals, each group of divided voltage signals has a gradient voltage grade, and the input end of the third voltage division module is the input end of the voltage control unit;

the gear gating module is used for selecting a partial pressure signal corresponding to a group of voltage gears according to the power supply voltage gear signal, a plurality of input ends of the gear gating module are correspondingly connected with a plurality of output ends of the third partial pressure module, and a plurality of control ends of the gear gating module are a plurality of gear control ends of the voltage control unit;

and the level gating module is used for selecting a divided voltage signal corresponding to one voltage level from a group of divided voltage signals according to the audio amplitude level signal to serve as the voltage level signal, a plurality of input ends of the level gating module are correspondingly connected with a plurality of output ends of the level gating module, and a plurality of control ends of the level gating module are a plurality of level control ends of the voltage control unit.

6. The circuit of claim 5, wherein the third voltage division module outputs N sets of divided voltage signals, each set of divided voltage signals having M levels of divided voltage signals;

then, the gear gating module comprises M one-out-of-N digital selectors, each group of partial pressure signals is connected with the input ends with the same serial number of the one-out-of-N digital selectors, N control ends of the one-out-of-N digital selectors are control ends of the gear gating module, and output ends of the N one-out-of-N digital selectors are output ends of the gear gating module;

then, the level gating module is an M-out-of-one digital selector, a plurality of input ends of the M-out-of-one digital selector are input ends of the level gating module, a plurality of control ends of the M-out-of-one digital selector are a plurality of control ends of the level gating module, and an output end of the M-out-of-one digital selector is an output end of the level gating module.

7. A BOOST chip, characterized in that the BOOST chip comprises the audio adaptive BOOST circuit according to any one of claims 1 to 6.

8. An audio device, characterized in that the audio device comprises the BOOST chip of claim 7.