CN115561662A - Power supply detection circuit, power supply circuit, power amplifier integrated circuit and sound equipment - Google Patents
Power supply detection circuit, power supply circuit, power amplifier integrated circuit and sound equipment Download PDFInfo
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Abstract
The application relates to the technical field of power electronics, in particular to a power supply detection circuit, a power supply circuit, a power amplifier integrated circuit and sound equipment. Wherein, power detection circuitry includes: a voltage conversion circuit and a comparator; the voltage conversion circuit is used for receiving the first power supply voltage and the second power supply voltage, detecting the voltage deviation between the first power supply voltage and the second power supply voltage, and outputting a detection voltage positively correlated to the voltage deviation to the comparator; the second input end of the comparator is connected with the first reference voltage; the comparator outputs a first signal indicative of the readiness of the power supply in the event that the detected voltage is less than the first reference voltage. By the arrangement, when the voltage difference between the first power supply voltage and the second power supply voltage is small, the detection voltage is small and is smaller than the first reference voltage, and the comparator outputs the first signal representing the readiness of the power supply.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a power supply detection circuit, a power supply circuit, a power amplifier integrated circuit and sound equipment.
Background
With the progress of science and technology and the development of society, more and more power amplifier integrated circuits are applied to various devices. For example: with the rapid development of new energy automobiles, the requirements of consumers on automobile cabin experience are higher and higher, and the number of automobile sound horns is increased from 6-8 of the traditional fuel oil automobile to 12-20 or even more of the existing new energy automobiles. In order to drive the loudspeakers, a D-type power amplifier integrated circuit is required.
In order to ensure the safe operation of a class-D power amplifier integrated circuit, a special power supply is usually arranged for the class-D power amplifier integrated circuit, in practical application, a certain time is needed from the connection of the power supply to the output of a power supply to output a working voltage meeting preset use requirements, in order to avoid damaging related load circuits such as the class-D power amplifier integrated circuit and the like in the process of establishing the working voltage, the power supply voltage of the power supply needs to be checked, and if the working voltage is normal, an application system can control to start a core component or other modules; otherwise, the application system is not started and is in a shutdown protection state.
However, because the class D power amplifier integrated circuit usually needs a power supply to perform multi-path power supply, the range of the power supply voltage is large, the power supply voltage is high, the output current and the output power are large, when the class D power amplifier integrated circuit works, the voltage difference between two paths of power supply voltages in the multi-path power supply voltage which needs to be provided by the power supply is within a preset range, and a detection scheme for the power supply requirement is absent at present, so that the effective detection of the power supply cannot be realized, and the power supply safety is difficult to guarantee.
Disclosure of Invention
In view of this, embodiments of the present application are directed to provide a power detection circuit, a power amplifier integrated circuit, and an audio device, so as to determine that a voltage difference between two power supply circuits is within a preset range.
Based on the first aspect of the present application, a power detection circuit is provided, which includes: a voltage conversion circuit and a comparator;
the first end of the voltage conversion circuit is used for receiving a first power supply voltage of the power supply;
the second end of the voltage conversion circuit is used for receiving a second power supply voltage of the power supply;
the third end of the voltage conversion circuit is connected with the first input end of the comparator;
the voltage conversion circuit is used for detecting voltage deviation between the first power supply voltage and the second power supply voltage and outputting a detection voltage positively correlated with the voltage deviation to the comparator;
the second input end of the comparator is connected with the first reference voltage;
the comparator outputs a first signal indicative of the readiness of the power supply in the event that the detected voltage is less than the first reference voltage.
In one embodiment, the comparator outputs the second signal in a case where the detection voltage is greater than the first reference voltage.
In one embodiment, a voltage conversion circuit includes: a resistance circuit and a feedback branch;
the first end of the resistance circuit is used as the first end of the voltage conversion circuit;
the second end of the resistance circuit is used as the second end of the voltage conversion circuit;
the third end of the resistance circuit is used as the third end of the voltage conversion circuit;
the fourth end of the resistance circuit is connected with the first end of the feedback branch circuit;
the fifth end of the resistance circuit is connected with the second end of the feedback branch circuit;
the third end of the feedback branch circuit is connected with a second reference voltage;
the fourth end of the feedback branch circuit is connected with the ground potential;
the voltage of the fourth end of the feedback branch circuit is controlled to be a second reference voltage;
the difference value obtained by subtracting the second reference voltage from the detection voltage is positively correlated with the voltage deviation.
In one embodiment, a resistance circuit includes: the circuit comprises a first resistance branch circuit, a second resistance branch circuit and a third resistance branch circuit;
the first end of the first resistance branch circuit is used as the first end of the resistance circuit;
the second end of the first resistance branch is connected with the first end of the third resistance branch;
the first end of the second resistance branch circuit is used as the second end of the resistance circuit;
the second end of the second resistance branch is connected with the second end of the third resistance branch;
the third end of the third resistance branch circuit is used as the fifth end of the resistance circuit;
the first end of the third resistance branch circuit is used as the third end of the resistance circuit;
and the second end of the third resistance branch is used as the fourth end of the resistance circuit.
In one embodiment, the resistance value of the first resistive branch is the same as the resistance value of the second resistive branch;
the resistance between the first end and the third end of the third resistance branch is the same as the resistance between the second end and the third end of the third resistance branch.
In one embodiment, the third resistive branch comprises: a first resistor, a second resistor and a third resistor;
the first end of the first resistor is used as the first end of the third resistor branch;
the second end of the first resistor is respectively connected with the first end of the second resistor and the first end of the third resistor;
the second end of the second resistor is used as the second end of the third resistor branch;
and the second end of the third resistor is used as the third end of the third resistor branch.
In one embodiment, the third resistive branch includes: a fourth resistor, a fifth resistor and a sixth resistor;
the first end of the fourth resistor is used as the first end of the third resistor branch;
the second end of the fourth resistor is used as the second end of the third resistor branch;
the first end of the fifth resistor is connected with the first end of the fourth resistor;
a second end of the fifth resistor is used as a third end of the third resistor branch;
the first end of the sixth resistor is connected with the second end of the fourth resistor;
and the second end of the sixth resistor is connected with the second end of the fifth resistor.
In one embodiment, the feedback branch comprises: an operational amplifier and an amplifier tube;
the negative input end of the operational amplifier is used as the first end of the feedback branch circuit;
the positive electrode input end of the operational amplifier is used as the third end of the feedback branch circuit;
the output end of the operational amplifier is connected with the first end of the amplifier;
the second end of the amplifier is used as the second end of the feedback branch;
the third terminal of the amplifier is used as the fourth terminal of the feedback branch.
In one embodiment, the fourth terminal of the feedback branch is connected to ground potential via a ninth resistor.
In one embodiment, the amplifying tube is an NPN triode;
the base electrode of the NPN triode is used as the first end of the amplifying tube;
the collector of the NPN triode is used as the second end of the amplifying tube;
and the emitter of the NPN triode is used as the third end of the amplifying tube.
In one embodiment, the amplifier tube is an NMOS transistor;
the grid electrode of the NMOS transistor is used as the first end of the amplifier tube;
the drain electrode of the NMOS transistor is used as the second end of the amplifying tube;
the source electrode of the NMOS transistor is used as a third end of the amplifying tube.
Based on the second aspect of the present application, there is provided a power supply circuit, including: a power supply circuit body and a power supply detection circuit as provided in any of the above embodiments.
Based on the third aspect of the present application, a power amplifier integrated circuit is provided, which includes: a power amplifier integrated circuit main body and a power circuit provided by any of the above embodiments.
Based on the fourth aspect of the present application, there is provided an acoustic apparatus, comprising: the main body of the sound equipment and any one of the above embodiments provide a power amplifier integrated circuit.
Based on the fifth aspect of the present application, a power detection method is provided, including:
acquiring a first power supply voltage and a second power supply voltage;
determining a detection voltage based on the first power supply voltage and the second power supply voltage; wherein the detection voltage is positively correlated with a voltage deviation between the first power supply voltage and the second power supply voltage;
under the condition that the detection voltage is smaller than a first reference voltage, outputting a first signal; the first signal is used for representing that the power supply is ready.
An embodiment of the present application provides a power detection circuit, including: a voltage conversion circuit and a comparator; the first end of the voltage conversion circuit is used for receiving a first power supply voltage of the power supply; the second end of the voltage conversion circuit is used for receiving a second power supply voltage of the power supply; the third end of the voltage conversion circuit is connected with the first input end of the comparator; the voltage conversion circuit is used for detecting voltage deviation between the first power supply voltage and the second power supply voltage and outputting a detection voltage positively correlated with the voltage deviation to the comparator; the second input end of the comparator is connected with the first reference voltage; the comparator outputs a first signal indicative of the readiness of the power supply in the event that the detected voltage is less than the first reference voltage. With the arrangement, when the voltage difference between the first power supply voltage and the second power supply voltage is smaller, the detection voltage is smaller and smaller than the first reference voltage, and the comparator outputs the first signal representing the readiness of the power supply.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally indicate like parts or steps.
Fig. 1 is a block diagram illustrating a power detection circuit according to an embodiment of the present application.
Fig. 2 is a block diagram of a power detection circuit according to another embodiment of the present application.
Fig. 3 is a block diagram of a power detection circuit according to another embodiment of the present application.
Fig. 4 is a circuit topology diagram of a power detection circuit according to an embodiment of the present application.
Fig. 5 is a circuit topology diagram of a power detection circuit according to another embodiment of the present application.
Fig. 6 is a schematic flowchart illustrating a power detection method according to an embodiment of the present application.
Reference numerals:
1. a voltage conversion circuit; 2. a comparator; 11. a resistance circuit; 12. a feedback branch; 111. a first resistive branch; 112. a second resistance branch; 113. a third resistance branch; 121. an operational amplifier; 122. an amplifier tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Summary of the application
With the progress of science and technology and the development of society, more and more power amplifier integrated circuits are applied to various devices. For example: with the rapid development of new energy automobiles, the requirements of consumers on automobile cabin experience are higher and higher, and the number of automobile sound horns is increased from 6-8 of the traditional fuel oil automobile to 12-20 or even more of the existing new energy automobiles. In order to drive the loudspeakers, a D-type power amplifier integrated circuit is required.
In order to ensure the safe operation of a class-D power amplifier integrated circuit, a special power supply is usually arranged for the class-D power amplifier integrated circuit, in practical application, a certain time is needed from the connection of the power supply to the output of a power supply to output a working voltage meeting preset use requirements, in order to avoid damaging related load circuits such as the class-D power amplifier integrated circuit and the like in the process of establishing the working voltage, the power supply voltage of the power supply needs to be checked, and if the working voltage is normal, an application system can control to start a core component or other modules; otherwise, the application system is not started and is in a shutdown protection state.
However, because a D-type power amplifier integrated circuit usually needs a power supply to perform multi-path power supply, the range of the power supply voltage is large, the power supply voltage is high, the output current and the output power are large, when the D-type power amplifier integrated circuit works, the voltage difference between two paths of power supply voltages in the multi-path power supply voltage which needs to be provided by the power supply is within a preset range, that is, the voltage difference between two paths of power supply voltages is smaller than a preset voltage difference value, a detection scheme for the power supply requirement is absent at present, effective detection for the power supply cannot be realized, and power supply safety is difficult to guarantee.
In order to solve the above problem, an embodiment of the present application provides a power detection circuit, including: a voltage conversion circuit and a comparator; the voltage conversion circuit is used for detecting the voltage deviation between the first power supply voltage and the second power supply voltage and outputting a detection voltage positively correlated with the voltage deviation to the comparator; and under the condition that the detection voltage is smaller than the preset value, the comparator outputs a first signal representing the readiness of the power supply. Therefore, when the voltage deviation between the first power supply voltage and the second power supply voltage is smaller than the preset voltage value, the comparator outputs a first signal representing the readiness of the power supply. Based on this, the power supply detection circuit can detect whether the voltage difference between the two power supply voltages is within a preset range.
Having described the general principles of the present application, various non-limiting embodiments of the present application will now be described with reference to the accompanying drawings.
Exemplary System
Fig. 1 is a schematic structural diagram of a power detection circuit according to an embodiment of the present disclosure. Referring to fig. 1, the power detection circuit includes:
a voltage conversion circuit 1 and a comparator 2;
the first end of the voltage conversion circuit 1 is used for receiving a first power supply voltage of a power supply;
the second end of the voltage conversion circuit 1 is used for receiving a second power supply voltage of the power supply;
the third end of the voltage conversion circuit 1 is connected with the first input end of the comparator 2;
the voltage conversion circuit 1 is used for detecting a voltage deviation between a first power supply voltage and a second power supply voltage and outputting a detection voltage positively correlated to the voltage deviation;
a second input end of the comparator 2 is connected with a first reference voltage;
in case the detection voltage is smaller than the first reference voltage, the comparator 2 outputs a first signal indicating that the power supply is ready.
In practical application, the detection voltage is positively correlated with the voltage deviation; when the voltage difference between the first power supply voltage and the second power supply voltage is smaller, the detection voltage is smaller and smaller than the first reference voltage, and the comparator outputs a first signal representing the readiness of the power supply.
In practical applications, there is a preset voltage difference value, and the power supply is ready when the voltage deviation between the first power supply voltage and the second power supply voltage is smaller than the preset voltage difference value. Based on this, the power detection circuit needs to be adjusted so that the detection voltage output by the third terminal of the voltage conversion circuit 1 is the same as the first reference voltage when the voltage deviation is equal to the preset voltage difference value. Specifically, the adjustment may be performed by adjusting the first reference voltage. When the voltage deviation is smaller than the preset voltage difference value, the detection voltage is smaller than the first reference voltage, the voltage of the first input terminal of the comparator 2 (i.e., the voltage deviation) is smaller than the voltage of the second input terminal of the comparator 2, and the comparator 2 outputs a first voltage signal indicating that the voltage difference between the first power supply voltage and the second power supply voltage (i.e., the voltage deviation) at the current moment is smaller than the preset voltage difference value.
Specifically, referring to fig. 4, a negative input terminal of the comparator 2 is used as a first input terminal of the comparator 2; the positive input end of the comparator 2 is used as the second input end of the comparator 2; in this way, when the detection voltage is smaller than the first reference voltage, the comparator 2 outputs a high voltage signal. The first signal thus indicating the readiness of the power supply is a high voltage signal.
Correspondingly, when the voltage deviation is greater than the preset voltage difference value, the detection voltage is greater than the first reference voltage, the voltage at the first input end of the comparator 2 is greater than the voltage at the second input end of the comparator 2, the voltage output by the comparator 2 deflects, and the comparator 2 outputs a second voltage signal indicating that the voltage deviation between the first power supply voltage and the second power supply voltage at the current moment is greater than the preset voltage difference value.
The preset voltage difference value may be referred to as a deflection voltage difference because the output of the comparator is deflected when the voltage deviation is equal to the preset voltage difference value.
Specifically, if two paths of power supply voltages of the power supply circuit are connected with the power supply detection circuit, that is, a first power supply voltage provided by the power supply circuit is connected to a first end of the voltage conversion circuit 1; the second power voltage provided by the power supply circuit is connected to the second end of the voltage conversion circuit 1, and then it can be determined whether the voltage deviation of the two power supply voltages of the power supply circuit is greater than a preset voltage difference value based on the signal output by the comparator 2, so as to judge whether the voltage difference between the two power supply circuits is within a preset range.
In one embodiment, referring to fig. 2, the voltage conversion circuit 1 includes: a resistance circuit 11 and a feedback branch 12;
the first terminal of the resistance circuit 11 serves as the first terminal of the voltage conversion circuit 1;
the second end of the resistance circuit 11 serves as the second end of the voltage conversion circuit 1;
the third terminal of the resistance circuit 11 is used as the third terminal of the voltage conversion circuit 1;
the fourth end of the resistance circuit 11 is connected to the first end of the feedback branch 12;
the fifth end of the resistance circuit 11 is connected with the second end of the feedback branch 12;
the third end of the feedback branch 12 is connected with a second reference voltage;
the fourth end of the feedback branch 12 is connected to the ground potential;
the feedback branch 12 controls the fourth end of the resistance circuit 11 to be a second reference voltage;
the difference value obtained by subtracting the second reference voltage from the detection voltage is positively correlated with the voltage deviation.
With this arrangement, a negative feedback loop is formed by the feedback branch 12 and part of the resistors of the resistor circuit 11, so that the fourth terminal of the resistor circuit 11 is the same as the second reference voltage, and under the influence of the negative feedback loop, the voltage of the fifth terminal of the resistor circuit 11 changes with the voltage of the first terminal and the second terminal of the resistor circuit 11. Namely: as the first power supply voltage and/or the second power supply voltage increases, the voltage of the fifth terminal decreases.
In actual use, the voltage deviation is generally a positive value; the difference obtained by subtracting the second reference voltage from the detection voltage is positively correlated with the voltage deviation, and if the second reference voltage is not less than the first reference voltage, the detection voltage is always greater than the first reference voltage, and the output of the comparator 2 does not deflect. Based on this, the second reference voltage needs to be smaller than the first reference voltage.
In one embodiment, referring to fig. 3, the resistance circuit 11 includes: a first resistive branch 111, a second resistive branch 112, and a third resistive branch 113;
a first end of the first resistance branch 111 serves as a first end of the resistance circuit 11;
the second end of the first resistive branch 111 is connected to the first end of the third resistive branch 113;
the first end of the second resistance branch 112 serves as the second end of the resistance circuit 11;
a second end of the second resistive branch 112 is connected to a second end of the third resistive branch 113;
the third end of the third resistance branch 113 is used as the fifth end of the resistance circuit 11;
the first end of the third resistance branch circuit is used as the third end of the resistance circuit;
and the second end of the third resistance branch is used as the fourth end of the resistance circuit.
In the scheme provided by the application, under the adjustment of the first resistance branch 111, the second resistance branch 112, and the third resistance branch 113, a difference obtained by subtracting the second reference voltage from the detection voltage output by the first resistance branch 111 is positively correlated with the voltage deviation. Thus, the deflection voltage is adjusted by adjusting the second reference voltage. If the second reference voltage increases, the deflection voltage decreases; if the second reference voltage decreases, the deflection voltage increases.
Specifically, the resistance of the first resistive branch 111 is the same as the resistance of the second resistive branch 112; the resistance between the first end and the third end of the third resistance branch is the same as the resistance between the second end and the third end of the third resistance branch.
It should be noted that, in the actual operation of the circuit, if the resistor circuit 11 is symmetrical with respect to the first power supply voltage and the second power supply voltage. The first resistor branch 111 outputs the sum of the voltage deviation of the preset multiple and the second reference voltage as the detection voltage. The preset multiple is determined by specific voltage values of the first resistive branch 111, the second resistive branch 112, and the third resistive branch 113.
In one embodiment, feedback branch 12 comprises: an operational amplifier 121 and an amplifying tube 122;
the negative input terminal of the operational amplifier 121 serves as the first terminal of the feedback branch 12;
the positive input terminal of the operational amplifier 121 serves as the third terminal of the feedback branch 12;
the output end of the operational amplifier 121 is connected to the first end of the amplifier;
a second terminal of the amplifier serves as a second terminal of the feedback branch 12;
the third terminal of the amplifier serves as the fourth terminal of the feedback branch 12.
With this arrangement, the operational amplifier 121, the amplifying tube 122 and part of the resistors in the resistor circuit 11 form the negative feedback branch 12, so that the operational amplifier 121 is in a virtual short state, the fourth terminal of the resistor circuit 11 is the same as the second reference voltage, and the change of the first power voltage and the second power voltage is fed back to the change of the second terminal voltage of the amplifier, so that the positive correlation between the detection voltage and the voltage deviation is maintained in the process that the first power voltage, the second power voltage and the second terminal voltage of the amplifier continuously change; namely: if the same voltage is increased or decreased at the same time in the first power supply voltage and the second power supply voltage, the detection voltage output by the voltage conversion circuit 1 is not changed.
Specifically, the detection voltage is the sum of the second reference voltage and the voltage deviation of a preset multiple; the preset multiple is determined based on the resistance circuit 11, and the preset multiple is the resistance coefficient of the resistance circuit 11. The resistivity of the resistor circuit 11 is determined by the connection mode of the resistors inside the resistor circuit 11 and the resistance value of the resistors.
Specifically, referring to fig. 5, the fourth terminal of the feedback branch is connected to the ground potential through a ninth resistor R9. Namely: the third end of the amplifier is connected with the ground potential through the ninth resistor R9, and thus, the ninth resistor R9 can be used as a compensation resistor to raise the driving voltage output by the output end of the operational amplifier to the first end of the amplifier.
In one embodiment, referring to fig. 4, third resistive branch 113 includes: a first resistor R1, a second resistor R2 and a third resistor R3;
a first end of the first resistor R1 serves as a first end of the third resistor branch 113;
the second end of the first resistor R1 is respectively connected with the first end of the second resistor R2 and the first end of the third resistor R3;
a second end of the second resistor R2 serves as a second end of the third resistor branch 113;
the second terminal of the third resistor R3 serves as the third terminal of the third resistor branch 113.
So set up, first resistance R1, second resistance R2 and third resistance R3 present Y type connection. When the first resistor R1 and the second resistor R2 have the same resistance, the resistance between the first end and the third end of the third resistor branch is the same as the resistance between the second end and the third end of the third resistor branch.
In one embodiment, third resistive branch 113 includes: a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;
a first end of the fourth resistor R4 serves as a first end of the third resistor branch 113;
a second end of the fourth resistor R4 serves as a second end of the third resistor branch 113;
a first end of the fifth resistor R5 is connected with a first end of the fourth resistor R4;
a second end of the fifth resistor R5 serves as a third end of the third resistor branch 113;
a first end of the sixth resistor R6 is connected with a second end of the fourth resistor R4;
a second terminal of the sixth resistor R6 is connected to a second terminal of the fifth resistor R5.
So set up, fourth resistance R4, fifth resistance R5 and sixth resistance R6 present triangle connection. When the resistance values of the fifth resistor R5 and the sixth resistor R6 are the same, the resistance value between the first end and the third end of the third resistor branch is the same as the resistance value between the second end and the third end of the third resistor branch. It should be noted that, based on the "Y-connected first resistor R1, second resistor R2, and third resistor R3" and "triangular-connected fourth resistor R4, fifth resistor R5, and sixth resistor R6", the specific implementation of the "triangular-connected fourth resistor R4, fifth resistor R5, and sixth resistor R6" will not be described too much.
In practical application, the mode of Y-shaped connection is superior to the mode of triangular connection, the Y-shaped set resistance coefficient is more visual, the sum of the Y-shaped connection with the same effect is smaller than the sum of the three resistance values of the triangular connection, and the area of a chip can be saved.
For example: in a delta connection, R4=2M Ω, R5=200k Ω, R6=200k Ω, and correspondingly, in a Y-connection equivalent to the resistive branch of the delta connection, R1=170k Ω, R2=170k Ω, R3=17k Ω; the total resistance of the three resistors in the triangular connection mode is 2.4M omega, the total resistance of the three resistors in the Y-type connection mode is 357k omega, only 15% of the total resistance of the three resistors in the triangular connection mode exists, and the occupied area is smaller in an actual chip.
In one embodiment, the amplifier tube 122 is an NPN transistor; the base of the NPN transistor serves as the first end of the amplifying tube 122; the collector of the NPN transistor serves as the second end of the amplifying transistor 122; the emitter of the NPN transistor serves as the third terminal of the amplifying tube 122. The NPN triode works in an amplifying region.
In another embodiment, the amplifier tube 122 is an NMOS transistor; the gate of the NMOS transistor serves as the first terminal of the amplifier tube 122; the drain of the NMOS transistor serves as the second terminal of the amplifier tube 122; the source of the NMOS transistor is used as the third terminal of the amplifier tube 122. The NMOS transistor operates in a subthreshold region of weak inversion.
In one embodiment, referring to fig. 4 or 5, the first resistive branch 111 includes a seventh resistor R7; the second resistive branch 112 includes an eighth resistor R8.
Furthermore, the resistance and the process parameters of the seventh resistor R7 are completely the same as those of the eighth resistor R8; the resistance and the technological parameters of the first resistor R1 are completely the same as those of the second resistor R2; the resistance value of the eighth resistor R8 is between 6 and 60 times that of the first resistor R1; the resistance conditions of the eighth resistor R8 and the first resistor R1 can be adjusted based on actual requirements. The resistance coefficient of the resistor circuit 11 is the sum of the resistance of the first resistor R1 divided by the resistance of the first resistor R1 and the resistance of the eighth resistor R8, that is: the resistance coefficient of the resistance circuit 11 is R 1 /(R 1 +R 8 ). Wherein the resistance value of the first resistor R1 is R 1 The eighth resistor R8 has a resistance of R 8 。
For example: resistance R of first resistor R1 1 Is the resistance R of the eighth resistor R8 8 The resistance coefficient is 1/25 when the resistance is 24 times that of the resistor; the first reference voltage takes 1.6V and the second reference voltage takes 1.5V. The second supply voltage range is: 4.5-30V; the range of voltage deviation is: 0-5V. The first supply voltage range is: the second power supply voltage minus a lower limit value of 0V to the second power supply voltage plus an upper limit value of 5V. The detection voltage is the sum of the product of the resistance coefficient and the voltage deviation and the second reference voltage, and the specific formula is as follows:
V detecting voltage ＝K*U Deviation of voltage +V First, the II Reference voltage (1)
U Voltage deviation = ＝V 1 -V 2 (2)
Wherein, V Detecting voltage For detecting voltage, K is the resistivity, U Deviation of voltage Is a voltage deviation, V Second reference voltage A second reference voltage V connected to the positive input terminal of the operational amplifier AMP 1 Is a first power supply voltage, V 2 The resistance value of the first resistor R1 is the second power voltageR 1 (ii) a The eighth resistor R8 has a resistance value of R 8 。
U Reference differential pressure ＝＝V First reference voltage -V Second reference voltage (4)
The calculation results show that: u shape Differential pressure of deflection Is 2.5V, i.e.: when the difference is 2.5V, the power supply ready signal output by the comparator COM is deflected. When voltage deviation U Deviation of voltage And when the voltage is less than 2.5V, the comparator COM outputs a first signal. When voltage deviation U Deviation of voltage And when the voltage is more than 2.5V, the comparator COM outputs a second signal. When voltage deviation U Deviation of voltage At 2.5V, the comparator COM output is deflected. The collector current of the NPN triode is less than 25uA, and the NPN triode works in an amplification region.
It should be noted that, in some embodiments, the connection manner of the third resistance branch 113 is a Y-type connection; in some embodiments, the third resistor branch 113 is connected in a delta connection. When the third resistor branch 113 is connected in a delta connection manner, the resistance coefficient is determined by the resistances of the fourth resistor R4, the fifth resistor R5, and the eighth resistor R8. The "third resistor branch 113 in the triangular connection manner" and the "third resistor branch 113 in the Y-connection manner" may be transformed into each other, and the circuit principles thereof are basically the same, and are not described herein again.
Exemplary Power supply Circuit
The application provides a power supply circuit, includes: a power supply main circuit and a power supply detection circuit provided by any one of the above embodiments;
the power supply main circuit is connected with the power supply detection circuit.
Exemplary Integrated Circuit
The application provides a power amplifier integrated circuit, includes: a power amplifier circuit and a power supply circuit as provided in any of the above embodiments;
the power amplifier circuit is connected with the power supply circuit.
Exemplary Acoustic device
The application provides a sound equipment, includes: the sound equipment comprises a sound equipment main body and a power amplifier integrated circuit provided by any one of the above embodiments;
the main body of the sound equipment is connected with the power amplifier integrated circuit.
Exemplary Power supply detection method
Referring to fig. 6, the present application provides a power detection method, including:
s601, acquiring a first power supply voltage and a second power supply voltage;
s602, determining a detection voltage based on the first power supply voltage and the second power supply voltage; wherein the detection voltage is positively correlated with a voltage deviation between the first power supply voltage and the second power supply voltage;
s603, outputting a first signal when the detection voltage is less than a first reference voltage; the first signal is used for representing the readiness of the power supply.
Specifically, determining the detection voltage based on the first power supply voltage and the second power supply voltage specifically includes:
determining a voltage offset based on the first supply voltage and the second supply voltage; the voltage deviation is the difference obtained by subtracting the second power supply voltage from the first power supply voltage; determining a detection voltage based on the voltage deviation; wherein the detection voltage is the sum of the product of the resistivity and the voltage deviation and the second reference voltage.
It should be noted that, the specific implementation manner of the above steps may refer to the description of the above exemplary power detection circuit.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (15)
1. A power supply detection circuit, comprising: a voltage conversion circuit and a comparator;
the first end of the voltage conversion circuit is used for receiving a first power supply voltage of a power supply;
the second end of the voltage conversion circuit is used for receiving a second power supply voltage of the power supply;
the third end of the voltage conversion circuit is connected with the first input end of the comparator;
wherein the voltage conversion circuit is configured to detect a voltage deviation between the first power supply voltage and the second power supply voltage, and output a detection voltage positively correlated with the voltage deviation to the comparator;
the second input end of the comparator is connected with a first reference voltage;
the comparator outputs a first signal indicating that the power supply is ready when the detection voltage is less than the first reference voltage.
2. The power supply detection circuit according to claim 1, wherein the comparator outputs a second signal in a case where the detection voltage is greater than the first reference voltage.
3. The power supply detection circuit of claim 1, wherein the voltage conversion circuit comprises: a resistance circuit and a feedback branch;
the first end of the resistance circuit is used as the first end of the voltage conversion circuit;
the second end of the resistance circuit is used as the second end of the voltage conversion circuit;
the third end of the resistance circuit is used as the third end of the voltage conversion circuit;
the fourth end of the resistance circuit is connected with the first end of the feedback branch circuit;
the fifth end of the resistance circuit is connected with the second end of the feedback branch circuit;
the third end of the feedback branch circuit is connected with a second reference voltage;
the fourth end of the feedback branch circuit is connected with the ground potential;
the feedback branch circuit controls the voltage of the fourth end of the resistance circuit to be a second reference voltage;
the difference obtained by subtracting the second reference voltage from the detection voltage is positively correlated with the voltage deviation.
4. The power supply detection circuit of claim 3, wherein the resistance circuit comprises: the circuit comprises a first resistance branch, a second resistance branch and a third resistance branch;
a first end of the first resistance branch is used as a first end of the resistance circuit;
the second end of the first resistance branch is connected with the first end of the third resistance branch;
the first end of the third resistance branch is used as the third end of the resistance circuit;
the first end of the second resistance branch is used as the second end of the resistance circuit;
the second end of the second resistance branch is connected with the second end of the third resistance branch;
a second end of the third resistance branch is used as a fourth end of the resistance circuit;
and the third end of the third resistance branch is used as the fifth end of the resistance circuit.
5. The power detection circuit of claim 4, wherein the resistance of the first resistive branch is the same as the resistance of the second resistive branch;
and the resistance between the first end and the third end of the third resistance branch is the same as the resistance between the second end and the third end of the third resistance branch.
6. The power supply detection circuit of claim 4, wherein the third resistive branch comprises: a first resistor, a second resistor and a third resistor;
a first end of the first resistor is used as a first end of the third resistor branch;
the second end of the first resistor is respectively connected with the first end of the second resistor and the first end of the third resistor;
a second end of the second resistor is used as a second end of the third resistor branch;
and the second end of the third resistor is used as the third end of the third resistor branch.
7. The power supply detection circuit of claim 4, wherein the third resistive branch comprises: a fourth resistor, a fifth resistor and a sixth resistor;
a first end of the fourth resistor is used as a first end of the third resistor branch;
a second end of the fourth resistor is used as a second end of the third resistor branch;
the first end of the fifth resistor is connected with the first end of the fourth resistor;
a second end of the fifth resistor is used as a third end of the third resistor branch;
the first end of the sixth resistor is connected with the second end of the fourth resistor;
and the second end of the sixth resistor is connected with the second end of the fifth resistor.
8. The power supply detection circuit of claim 3, wherein the feedback branch comprises: an operational amplifier and an amplifier tube;
the negative input end of the operational amplifier is used as the first end of the feedback branch circuit;
the positive input end of the operational amplifier is used as the third end of the feedback branch circuit;
the output end of the operational amplifier is connected with the first end of the amplifier;
the second end of the amplifier is used as the second end of the feedback branch;
and the third end of the amplifier is used as the fourth end of the feedback branch.
9. The power detection circuit of claim 8, wherein the fourth terminal of the feedback branch is connected to ground potential through a ninth resistor.
10. The power detection circuit of claim 8, wherein the amplifier tube is an NPN transistor;
the base electrode of the NPN triode is used as the first end of the amplifying tube;
a collector of the NPN triode is used as a second end of the amplifying tube;
and an emitter of the NPN triode is used as a third end of the amplifying tube.
11. The power detection circuit of claim 8, wherein the amplifier tube is an NMOS transistor;
the grid electrode of the NMOS transistor is used as the first end of the amplifying tube;
the drain electrode of the NMOS transistor is used as the second end of the amplifying tube;
and the source electrode of the NMOS transistor is used as the third end of the amplifying tube.
12. A power supply circuit, comprising: a power supply main circuit and a power supply detection circuit as claimed in claims 1 to 11;
the power supply main circuit is connected with the power supply detection circuit.
13. A power amplifier integrated circuit, comprising: a power amplifier circuit and a power supply circuit according to claim 12;
the power amplifier circuit is connected with the power supply circuit.
14. An acoustic device, comprising: a main body of audio equipment and a power amplifier integrated circuit according to claim 13;
the main body of the sound equipment is connected with the power amplifier integrated circuit.
15. A method for power supply detection, comprising:
acquiring a first power supply voltage and a second power supply voltage;
determining a detection voltage based on the first power supply voltage and the second power supply voltage; wherein the detection voltage is positively correlated with a voltage deviation between the first power supply voltage and the second power supply voltage;
under the condition that the detection voltage is smaller than a first reference voltage, outputting a first signal; the first signal is used for representing the readiness of the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211172101.8A CN115561662A (en) | 2022-09-26 | 2022-09-26 | Power supply detection circuit, power supply circuit, power amplifier integrated circuit and sound equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211172101.8A CN115561662A (en) | 2022-09-26 | 2022-09-26 | Power supply detection circuit, power supply circuit, power amplifier integrated circuit and sound equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115561662A true CN115561662A (en) | 2023-01-03 |
Family
ID=84743200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211172101.8A Pending CN115561662A (en) | 2022-09-26 | 2022-09-26 | Power supply detection circuit, power supply circuit, power amplifier integrated circuit and sound equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115561662A (en) |
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2022
- 2022-09-26 CN CN202211172101.8A patent/CN115561662A/en active Pending
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