Digital amplifier and linear power amplifier box including the digital amplifier

Abstract

The present invention discloses a digital amplifier and a linear power amplifier box including the digital amplifier. The digital amplifier includes an analog power amplifier front panel and an analog power amplifier board; the analog power amplifier front panel is electrically connected to a signal source; the analog power amplifier front panel includes a composite alarm circuit and a small current alarm circuit, and the composite alarm circuit is electrically connected to the small current alarm circuit. The digital amplifier and the linear power amplifier box including the digital amplifier disclosed in the present invention have the beneficial effect that a plurality of functional circuits are respectively arranged on the analog power amplifier front panel or the analog power amplifier board, which are used to calibrate various types of faults such as overcurrent of the meter under test. The concept of hierarchical calibration is fully implemented, and combined with the characteristics that the analog power amplifier front panel and the analog power amplifier board are separated and arranged adjacently, the alarm signal does not need to be outputted after all calibrations are completed. During the calibration process, the alarm signal is generated according to the actual situation at any time, thereby improving the real-time performance of the calibration process of the meter under test.

Description

Technical Field

[0001] The invention belongs to the technical field of amplifiers, and in particular relates to a digital amplifier and a linear power amplifier box comprising the digital amplifier. Background Art

[0002] A digital amplifier is an electronic device that can enhance the strength of digital signals. Digital amplifiers are often used in digital communication systems, digital audio equipment, computer hardware, and other occasions where signal enhancement is required.

[0003] The patent with announcement number CN210572709U discloses a high-voltage power amplifier. The technical solution of the above patent discloses: a high-voltage power amplifier, which has a basic amplifier 1, a signal input unit 2, a working power supply unit 3, and a feedback circuit 4. Among them, the basic amplifier 1 is composed of an operational amplifier and a current-expanding and voltage-boosting field-effect transistor, and the basic amplifier 1 has a signal input terminal and a voltage output terminal. The signal input terminal of the basic amplifier 1 is connected to the signal input unit 2, and the signal input unit 2 provides a standard signal to the basic amplifier 1. The basic amplifier 1 amplifies the input small voltage signal into the required high voltage, and then outputs it from the voltage output terminal of the basic amplifier 1, such as to the voltmeter under test.

[0004] The defect of the technical solution of the above patent is that the basic amplifier 1, signal input unit 2 and other functional circuits are all mounted on the same board, and no discrete design is implemented according to the calibration requirements of the meter under test. In addition, the technical solution of the above patent cannot generate an alarm signal at any time during the calibration process, and needs to be further improved. Summary of the invention

[0005] The present invention aims at the prior art, overcomes the above defects and provides a digital amplifier and a linear power amplifier box including the digital amplifier.

[0006] The present invention adopts the following technical solution, the digital amplifier includes an analog power amplifier pre-board and an analog power amplifier board, wherein:

[0007] The analog power amplifier front panel is electrically connected to the signal source;

[0008] The analog power amplifier front panel includes a composite alarm circuit and a small current alarm circuit, the composite alarm circuit and the small current alarm circuit are electrically connected, the composite alarm circuit simultaneously obtains the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; the small current alarm circuit simultaneously obtains the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; the composite alarm circuit simultaneously generates a composite alarm signal based on the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; the small current alarm circuit simultaneously generates a small current alarm signal based on the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal;

[0009] The analog power amplifier board includes a hardware protection circuit and an overcurrent detection circuit, the hardware protection circuit is electrically connected to the overcurrent detection circuit; the hardware protection circuit simultaneously outputs a hardware protection signal based on a signal source enable signal and a previous stage output signal; the overcurrent detection circuit outputs an overcurrent alarm signal based on the hardware protection signal.

[0010] As a preferred technical solution of the above technical solution, the composite alarm signal includes one or more alarm signals of a current open circuit alarm signal, an overload alarm signal, and a voltage short circuit alarm signal.

[0011] As a preferred technical solution of the above technical solution, the analog power amplifier board includes a signal push-pull amplifier circuit and a power amplifier circuit, and the signal push-pull amplifier circuit is electrically connected to the power amplifier circuit; the signal push-pull amplifier circuit obtains the previous stage output signal, and the signal push-pull amplifier circuit and the power amplifier circuit jointly amplify the previous stage output signal to perform power output.

[0012] As a preferred technical solution of the above technical solution, the analog power amplifier front board also includes a signal first-level amplification circuit and a signal second-level amplification circuit. The input side of the signal second-level amplification circuit is electrically connected to the output side of the signal first-level amplification circuit. The output side of the signal second-level amplification circuit is electrically connected to the composite alarm circuit, the small current alarm circuit, the signal push-pull amplification circuit and the hardware protection circuit at the same time. The primary feedback input signal, the secondary feedback input signal and the signal source input signal are input at the input side of the signal first-level amplification circuit.

[0013] The present invention adopts the following technical solution: a linear power amplifier box comprises the digital amplifier of any one of the above technical solutions, the digital amplifier is built into the linear power amplifier box, and the analog power amplifier front board is located on one side of the analog power amplifier board and plugged into the analog power amplifier board.

[0014] As a preferred technical solution of the above technical solution, the linear power amplifier box includes a front panel and a box body, the front panel is embedded in the box body, the front panel and the box body are inwardly surrounded to form an inner cavity, and the digital amplifier is accommodated in the inner cavity.

[0015] As a preferred technical solution of the above technical solution, a heat sink is provided on the other side of the analog power amplifier board away from the analog power amplifier front board, the heat sink is plugged into the analog power amplifier board, and the heat sink and the analog power amplifier front board are located on opposite sides of the analog power amplifier board.

[0016] The digital amplifier and the linear power amplifier box including the digital amplifier disclosed in the present invention have the beneficial effect that a plurality of functional circuits are respectively arranged on the analog power amplifier front panel or the analog power amplifier board, and are used to calibrate various types of faults of the meter under test, such as overcurrent, current open circuit, overload, voltage short circuit, etc. At the same time, the concept of hierarchical calibration is fully implemented, and combined with the characteristics that the analog power amplifier front panel and the analog power amplifier board are separated and arranged adjacently, it is not necessary to output the alarm signal after all calibration is completed, but the alarm signal is actually generated at any time during the calibration process, thereby improving the real-time performance of the calibration process of the meter under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereoscopic diagram of the linear power amplifier box of the present invention from one viewing angle.

[0018] Figure 2 It is a stereoscopic diagram of the linear power amplifier box of the present invention from another viewing angle.

[0019] Figure 3 is Figure 1 The three-dimensional image after the front panel is basically hidden.

[0020] Figure 4 It is a three-dimensional diagram of the digital amplifier of the present invention from one viewing angle.

[0021] Figure 5 It is a stereogram of the digital amplifier of the present invention from another viewing angle.

[0022] Figure 6 It is a three-dimensional diagram from one viewing angle of the analog power amplifier board of the digital amplifier of the present invention.

[0023] Figure 7 It is a stereoscopic diagram of the analog power amplifier board of the digital amplifier of the present invention from another perspective.

[0024] Figure 8 It is a three-dimensional diagram from one viewing angle of the analog power amplifier front panel of the digital amplifier of the present invention.

[0025] Fig. 9 It is a three-dimensional diagram of the analog power amplifier front panel of the digital amplifier of the present invention from another perspective.

[0026] Fig.10 yes Figure 1 A partial enlarged view of area A.

[0027] Fig.11 yes Figure 1 A partial enlarged view of area B.

[0028] Fig.12 yes Figure 2 A partial enlarged view of the middle C area.

[0029] Fig.13 yes Figure 3 A partial enlarged view of the D area in the middle.

[0030] Fig.14 The invention discloses a circuit schematic diagram of a signal push-pull amplifier circuit, a power amplifier circuit, a hardware protection circuit and an overcurrent detection circuit of an analog power amplifier board.

[0031] Fig.15 The invention discloses a circuit schematic diagram of an overcurrent detection circuit and a power supply circuit of an analog power amplifier board.

[0032] Fig.16 The invention discloses a circuit schematic diagram of a signal primary amplifying circuit, a signal secondary amplifying circuit, a composite alarm circuit and a small current alarm circuit of an analog power amplifier front panel.

[0033] Explanation of the reference numerals: 1-digital amplifier; 2-linear power amplifier box; 3-front panel; 4-box; 5-inner cavity; 11-analog power amplifier front panel; 12-analog power amplifier board; 13-heat sink. DETAILED DESCRIPTION

[0034] The present invention discloses a digital amplifier and a linear power amplifier box including the digital amplifier. Figures 1 to 16 , the specific implementation modes of the present invention are further described.

[0035] Example 1.

[0036] See attached figure Figures 14 to 16 Preferably, the digital amplifier 1 comprises an analog power amplifier pre-board 11 and an analog power amplifier board 12, wherein:

[0037] The analog power amplifier front panel 11 is electrically connected to a signal source (it should be noted that the signal source is not shown in the figure and is not the object of protection of the technical solution of this application, the same below);

[0038] The analog power amplifier front panel 11 includes a composite alarm circuit and a small current alarm circuit, the composite alarm circuit and the small current alarm circuit are electrically connected, the composite alarm circuit simultaneously obtains the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; the small current alarm circuit simultaneously obtains the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; the composite alarm circuit simultaneously generates a composite alarm signal based on the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal (selectively based on the actual situation); the small current alarm circuit simultaneously generates a small current alarm signal based on the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal (selectively based on the actual situation) (if the small current alarm circuit does not detect a small current, that is, a leakage current, the same below, no further description, then the small current alarm signal is not output, which fully reflects the selective generation of the alarm signal based on the actual situation);

[0039] The analog power amplifier board 12 includes a hardware protection circuit and an overcurrent detection circuit, and the hardware protection circuit is electrically connected to the overcurrent detection circuit; the hardware protection circuit simultaneously outputs a hardware protection signal based on the signal source enable signal and the front-stage output signal (output by the analog power amplifier front board 11) (selectively based on the actual situation); the overcurrent detection circuit outputs an overcurrent alarm signal based on the hardware protection signal (selectively based on the actual situation), so that the hardware protection circuit and the overcurrent detection circuit respectively (selectively based on the actual situation) generate the alarm signal (for example, if the overcurrent detection circuit does not detect a fault such as overcurrent, the alarm signal will not be output, which fully reflects the selective generation of the alarm signal based on the actual situation).

[0040] Among them, the composite alarm signal includes one or more alarm signals of current open circuit alarm signal, overload alarm signal, and voltage short circuit alarm signal (if the composite alarm circuit does not detect any one of the current open circuit, overload, and voltage short circuit faults, the alarm signal will not be output, which fully reflects the selective generation of the alarm signal based on facts).

[0041] The analog power amplifier board 12 further includes a signal push-pull amplifier circuit and a power amplifier circuit, and the signal push-pull amplifier circuit is electrically connected to the power amplifier circuit. The signal push-pull amplifier circuit obtains (the front-stage output signal is simultaneously input into the signal push-pull amplifier circuit) the front-stage output signal, and the signal push-pull amplifier circuit and the power amplifier circuit jointly amplify the front-stage output signal to perform power output.

[0042] Among them, the analog power amplifier front panel 11 also includes a signal first-stage amplification circuit and a signal second-stage amplification circuit. The input side of the signal second-stage amplification circuit is electrically connected to the output side of the signal first-stage amplification circuit. The output side of the signal second-stage amplification circuit is electrically connected to the composite alarm circuit, the small current alarm circuit, the signal push-pull amplification circuit and the hardware protection circuit at the same time. The primary feedback input signal, the secondary feedback input signal and the signal source input signal are input at the input side of the signal first-stage amplification circuit; so that the primary feedback input signal, the secondary feedback input signal and the signal source input signal are amplified step by step by the signal first-stage amplification circuit and the signal second-stage amplification circuit, and the analog power amplifier front panel 11 is able to output the pre-stage output signal.

[0043] Wherein, the analog power amplifier board also includes a power supply circuit, and the power supply circuit is electrically connected to multiple functional circuits such as the hardware protection circuit at the same time, so as to provide matching power supply outputs to the multiple functional circuits such as the hardware protection circuit respectively.

[0044] See attached figure Figures 1 to 13 Preferably, the linear power amplifier box 2 includes (one) the digital amplifier 1, the digital amplifier 1 is built into the linear power amplifier box 2, and the analog power amplifier front board 11 is located on one side of the analog power amplifier board 12 and plugged into the analog power amplifier board 12.

[0045] The linear power amplifier box 2 includes a front panel 3 and a box body 4 , wherein the front panel 3 is embedded in the box body 4 , and the front panel 3 and the box body 4 are inwardly surrounded to form an inner cavity 5 , and the digital amplifier 1 is accommodated in the inner cavity 5 .

[0046] A heat sink 13 is provided on the other side of the analog power amplifier board 12 away from the analog power amplifier front board 11, and the heat sink 13 is plugged into the analog power amplifier board 12, so that the heat sink 13 and the analog power amplifier front board 11 are located on different sides of the analog power amplifier board 12, so as to enhance the heat dissipation capacity of the digital amplifier 1 (and the adjacent digital amplifier 1) where the heat sink 13 is located.

[0047] The following describes the technical highlights of the digital amplifier and the linear power amplifier box including the digital amplifier disclosed in various embodiments.

[0048] 1. The primary feedback input signal refers to the signal directly obtained from the primary side of the meter under test (i.e., the side connected to the power supply). The primary feedback input signal includes a voltage feedback signal and a current feedback signal. Since the voltage feedback signal and the current feedback signal are directly obtained from the power grid for the purpose of calculating the power consumption of the meter under test, the measurement accuracy of the primary feedback input signal is relatively high, and it directly reflects the actual voltage and current values ​​of the power supply to which the meter under test is connected.

[0049] 2. The secondary feedback input signal refers to the signal directly obtained through the secondary side of the meter under test (i.e., the side connected to the load). The secondary feedback input signal is transmitted to the load after voltage and current conversion (such as through a voltage transformer and a current transformer), and then the secondary feedback input signal is fed back to the terminal of the meter under test for measurement.

[0050] 3. The measurement circuits where the primary feedback input signal and the secondary feedback input signal are located are different (primary feedback circuit and secondary feedback circuit), and the measurement parameters of the primary side and the secondary side of the meter under test can be measured respectively, which helps to reduce measurement errors and improve the accuracy and reliability of the calibration process of the meter under test.

[0051] 4. The digital amplifier 1 separates and adjacently arranges the analog power amplifier front board 11 and the analog power amplifier board 12.

[0052] 5. A plurality of functional circuits are respectively provided on the analog power amplifier front panel 11 or the analog power amplifier board 12, for calibrating various types of faults of the meter under test, such as overcurrent, current open circuit, overload, voltage short circuit, etc. At the same time, the concept of hierarchical calibration is fully implemented, and combined with the characteristics that the analog power amplifier front panel 11 and the analog power amplifier board 12 are separated and arranged adjacently, the alarm signal does not need to be output after all calibrations are completed, but the alarm signal is generated according to the actual situation at any time during the calibration process, thereby improving the real-time performance of the calibration process of the meter under test.

[0053] Example 2.

[0054] The technical solution of Example 2 differs from the technical solution of Example 1 in that the number of the digital amplifiers 1 in Example 1 is one, while the number of the digital amplifiers 1 in Example 2 is two or more, and each of the digital amplifiers 1 is accommodated in the inner cavity 5 respectively.

[0055] The technical effect achieved by the technical solution of Example 2 is: preferably, a set of the digital amplifier 1 is arranged on each side of the inner cavity 4 of the linear power amplifier box 2, so that the digital amplifiers 1 located on both sides can not only back up each other, but also can relatively independently and parallelly detect different meters under test, which helps to improve the calibration efficiency of the meters under test.

[0056] It is worth mentioning that the technical features such as the heat sink 13 involved in the patent application of the present invention should be regarded as the prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected according to the conventional methods in the field, and should not be regarded as the inventive point of the patent of the present invention. The patent of the present invention will not be further elaborated.

[0057] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A digital amplifier, characterized in that: It includes an analog power amplifier pre-board and an analog power amplifier board, wherein: The analog power amplifier front panel is electrically connected to the signal source; The analog power amplifier front panel includes a composite alarm circuit and a small current alarm circuit, the composite alarm circuit and the small current alarm circuit are electrically connected, the composite alarm circuit simultaneously obtains the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; the small current alarm circuit simultaneously obtains the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; the composite alarm circuit simultaneously generates a composite alarm signal based on the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; the small current alarm circuit simultaneously generates a small current alarm signal based on the amplified primary feedback input signal, the secondary feedback input signal and the signal source input signal; The analog power amplifier board includes a hardware protection circuit and an overcurrent detection circuit, wherein the hardware protection circuit is electrically connected to the overcurrent detection circuit; the hardware protection circuit outputs a hardware protection signal according to a signal source enable signal and a previous stage output signal; and the overcurrent detection circuit outputs an overcurrent alarm signal according to the hardware protection signal. The primary feedback input signal refers to a signal directly obtained from the primary side of the meter under test; the primary feedback input signal includes a voltage feedback signal and a current feedback signal; The secondary feedback input signal refers to the signal directly obtained through the secondary side of the meter under test; the secondary feedback input signal is transmitted to the load after voltage and current conversion, and then the secondary feedback input signal is fed back to the terminal of the meter under test for measurement.

2. The digital amplifier according to claim 1, characterized in that: The composite alarm signal includes one or more alarm signals of a current open circuit alarm signal, an overload alarm signal, and a voltage short circuit alarm signal.

3. The digital amplifier according to claim 1, characterized in that: The analog power amplifier board includes a signal push-pull amplifier circuit and a power amplifier circuit, and the signal push-pull amplifier circuit is electrically connected to the power amplifier circuit; the signal push-pull amplifier circuit obtains the previous stage output signal, and the signal push-pull amplifier circuit and the power amplifier circuit jointly amplify the previous stage output signal to perform power output.

4. The digital amplifier according to claim 3, characterized in that: The analog power amplifier front panel also includes a signal primary amplification circuit and a signal secondary amplification circuit. The input side of the signal secondary amplification circuit is electrically connected to the output side of the signal primary amplification circuit. The output side of the signal secondary amplification circuit is electrically connected to the composite alarm circuit, the small current alarm circuit, the signal push-pull amplification circuit and the hardware protection circuit at the same time. The primary feedback input signal, the secondary feedback input signal and the signal source input signal are input at the input side of the signal primary amplification circuit.

5. A linear power amplifier box, characterized in that: The digital amplifier comprises the digital amplifier of any one of claims 1 to 4, wherein the digital amplifier is built into the linear power amplifier box, and the analog power amplifier front panel is located at one side of the analog power amplifier board and plugged into the analog power amplifier board.

6. The linear power amplifier box according to claim 5, characterized in that: The linear power amplifier box comprises a front panel and a box body, wherein the front panel is embedded in the box body, and the front panel and the box body are inwardly surrounded to form an inner cavity, and the digital amplifier is accommodated in the inner cavity.

7. The linear power amplifier box according to claim 5, characterized in that: A heat sink is provided on the other side of the analog power amplifier board away from the analog power amplifier front board. The heat sink is plugged into the analog power amplifier board. The heat sink and the analog power amplifier front board are located on different sides of the analog power amplifier board.

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