Class AB DSP (Digital Signal Processor) power amplifier module

Abstract

The invention discloses an AB-type DSP power amplifier module. The AB-type DSP power amplifier module comprises a first power amplifier unit; the second power amplifier unit is connected to the rear end of the first power amplifier unit in series; the power detection unit is used for detecting the output power of the first power amplifier unit; the temperature detection unit is used for detecting the temperature of the area where the second power amplifier unit is located; and the control unit is used for adjusting the bias voltage of the second power amplifier unit according to detection data of the power detection unit and the temperature detection unit. According to the invention, the bias voltage of the second power amplifier unit can be adjusted according to the output power of the first power amplifier unit, so that the first power amplifier unit and the second power amplifier unit can work well in a coordinated manner.

Description

Technical Field

[0001] The invention relates to the technical field of audio power amplifiers, in particular to an AB class DSP power amplifier module. Background Art

[0002] Currently, when two power amplifier units are connected in series, the latter power amplifier unit cannot adjust its working state according to the output signal of the former power amplifier unit, so that the two power amplifier units cannot work in a coordinated manner and cannot achieve the best use effect. Summary of the invention

[0003] The present application provides a class AB DSP power amplifier module, which can adjust the bias voltage of a second power amplifier unit according to the output power of the first power amplifier unit, so that the first power amplifier unit and the second power amplifier unit can work in a better coordinated manner.

[0004] The class AB DSP amplifier module provided in this application includes:

[0005] A first power amplifier unit;

[0006] A second power amplifier unit is serially connected to the rear end of the first power amplifier unit;

[0007] A power detection unit, used to detect the output power of the first power amplifier unit;

[0008] A temperature detection unit, used to detect the temperature of the area where the second power amplifier unit is located;

[0009] The control unit adjusts the bias voltage of the second power amplifier unit according to the detection data of the power detection unit and the temperature detection unit.

[0010] Preferably, the first power amplifier unit and the second power amplifier unit are both class AB power amplifier units.

[0011] Preferably, the second power amplifier unit includes a signal input end, two power modules, a signal output end, an NPN-type transistor Q1 and a PNP-type transistor Q2, the two power modules are connected in series between the base of the transistor Q1 and the base of the transistor Q2 in sequence, the control unit is electrically connected to the two power modules respectively, the control unit adjusts the output voltages of the two power modules according to the detection data of the power detection unit and the temperature detection unit, the signal input end is connected between the two power modules, the collector of the transistor Q1 is connected to the positive pole of the power supply, the emitter of the transistor Q1 is connected to the emitter of the transistor Q2, the collector of the transistor Q2 is connected to the negative pole of the power supply, and the signal output end is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2.

[0012] Preferably, the temperature detection unit includes a first temperature sensor and a second temperature sensor, the first temperature sensor is used to detect the temperature A of the area where the first power amplifier unit is located, and the second temperature sensor is used to detect the temperature B of the area where the second power amplifier unit is located, and the control unit adjusts the output voltage of the two power modules according to the difference between temperature A and temperature B combined with the detection data of the power detection unit.

[0013] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0014] In the present application, the first power amplifier unit and the second power amplifier unit are connected in series to amplify the audio signal, and the power detection unit can detect the output power of the first power amplifier unit, and the temperature detection unit can detect the temperature of the area where the second power amplifier unit is located. Then the control unit adjusts the bias voltage of the second power amplifier unit according to the detection data of the power detection unit and the temperature detection unit, so that the second power amplifier unit can cooperate well with the first power amplifier unit to work at different temperatures, so that the first power amplifier unit and the second power amplifier unit can work better in coordination. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the second power amplifier unit. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products, or devices.

[0020] like Figure 1 , Figure 2 As shown, the class AB DSP power amplifier module of this embodiment includes a first power amplifier unit 10 , a second power amplifier unit 20 , a power detection unit 30 , a temperature detection unit 40 and a control unit 50 .

[0021] The second power amplifier unit 20 is connected in series to the rear end of the first power amplifier unit 10 . The first power amplifier unit 10 and the second power amplifier unit 20 are connected in series to gradually amplify the audio signal.

[0022] The power detection unit 30 is used to detect the output power of the first power amplifier unit 10 , and the power detection unit 30 sends the detection data to the control unit 50 .

[0023] The temperature detection unit 40 is used to detect the temperature of the area where the second power amplifier unit 20 is located, and the temperature detection unit 40 sends the detection data to the control unit 50 .

[0024] The control unit 50 adjusts the bias voltage of the second power amplifying unit 20 according to the detection data of the power detection unit 30 and the temperature detection unit 40 .

[0025] The first power amplifier unit 10 and the second power amplifier unit 20 are both class AB power amplifier units.

[0026] The second power amplifier unit 20 includes a signal input terminal 21, two power modules 22, a signal output terminal 23, an NPN transistor Q1 and a PNP transistor Q2. The two power modules 22 are connected in series between the base of the transistor Q1 and the base of the transistor Q2. The control unit 50 is electrically connected to the two power modules 22 respectively. The control unit 50 adjusts the output voltages of the two power modules 22 according to the detection data of the power detection unit 30 and the temperature detection unit 40. The signal input terminal 21 is connected between the two power modules 22. The signal input terminal 21 is connected to the signal output terminal of the first power amplifier unit 10, the two power modules 22 provide bias voltages for the transistors Q1 and Q2, and the control unit 50 can adjust the bias voltages of the two power modules 22, the collector of the transistor Q1 is connected to the positive pole of the power supply, the emitter of the transistor Q1 is connected to the emitter of the transistor Q2, the collector of the transistor Q2 is connected to the negative pole of the power supply, the signal output terminal 23 is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2, and the signal output terminal 23 is connected to the speaker.

[0027] The temperature detection unit 40 includes a first temperature sensor and a second temperature sensor, the first temperature sensor is used to detect the temperature A of the area where the first power amplifier unit is located, and the second temperature sensor is used to detect the temperature B of the area where the second power amplifier unit is located. The control unit 50 adjusts the output voltage of the two power modules 22 according to the difference between temperature A and temperature B combined with the detection data of the power detection unit 30.

[0028] A calculation model is preset in the control unit 50, and the difference between temperature A and temperature B and the output power of the first power amplifier unit 10 are used as input parameters, so that the control unit 50 can calculate the bias voltage of the second power amplifier unit 20 according to the calculation model, and then the control unit 50 controls the two power supply modules 22 to adjust the bias voltage of the second power amplifier unit 20 accordingly.

[0029] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0030] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0031] This specification and drawings are merely exemplary illustrations of the present application and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application intends to include these modifications and variations.

Claims

1. A class AB DSP power amplifier module, characterized in that: include: A first power amplifier unit (10); A second power amplifier unit (20) is serially connected to the rear end of the first power amplifier unit (10); A power detection unit (30), used for detecting the output power of the first power amplifier unit (10); A temperature detection unit (40), used for detecting the temperature of the area where the second power amplifier unit (20) is located; The control unit (50) adjusts the bias voltage of the second power amplifier unit (20) according to the detection data of the power detection unit (30) and the temperature detection unit (40).

2. The class AB DSP power amplifier module according to claim 1, characterized in that: The first power amplifier unit (10) and the second power amplifier unit (20) are both class AB power amplifier units.

3. The class AB DSP power amplifier module according to claim 2, characterized in that: The second power amplifier unit (20) comprises a signal input end (21), two power modules (22), a signal output end (23), an NPN-type transistor Q1 and a PNP-type transistor Q2. The two power modules (22) are connected in series between the base of the transistor Q1 and the base of the transistor Q2 in sequence. The control unit (50) is electrically connected to the two power modules (22) respectively. The control unit (50) adjusts the output voltages of the two power modules (22) according to the detection data of the power detection unit (30) and the temperature detection unit (40). The signal input end (21) is connected between the two power modules (22). The collector of the transistor Q1 is connected to the positive pole of the power supply. The emitter of the transistor Q1 is connected to the emitter of the transistor Q2. The collector of the transistor Q2 is connected to the negative pole of the power supply. The signal output end (23) is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2.

4. The class AB DSP power amplifier module according to claim 3, characterized in that: The temperature detection unit (40) comprises a first temperature sensor and a second temperature sensor, the first temperature sensor being used to detect a temperature A of an area where the first power amplifier unit is located, and the second temperature sensor being used to detect a temperature B of an area where the second power amplifier unit is located, and the control unit (50) adjusting the output voltages of the two power modules (22) according to the difference between the temperature A and the temperature B combined with the detection data of the power detection unit (30).

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